diff --git a/.gitignore b/.gitignore
index 485bbafb4bca310a818e31774d8cef93c041227b..a2624fcf7c55f2c2bd2d270b3f43d6c9bb2a5d78 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,4 +1,5 @@
 /target
 /.vscode
 /book/book
-*.dot
\ No newline at end of file
+*.dot
+*.svg
diff --git a/.gitlab-ci.yml b/.gitlab-ci.yml
new file mode 100644
index 0000000000000000000000000000000000000000..296268dde33964b9e5617a932dcd7a45324e9208
--- /dev/null
+++ b/.gitlab-ci.yml
@@ -0,0 +1,48 @@
+# This file is a template, and might need editing before it works on your project.
+# You can copy and paste this template into a new `.gitlab-ci.yml` file.
+# You should not add this template to an existing `.gitlab-ci.yml` file by using the `include:` keyword.
+#
+# To contribute improvements to CI/CD templates, please follow the Development guide at:
+# https://docs.gitlab.com/ee/development/cicd/templates.html
+# This specific template is located at:
+# https://gitlab.com/gitlab-org/gitlab/-/blob/master/lib/gitlab/ci/templates/Rust.gitlab-ci.yml
+
+# Official language image. Look for the different tagged releases at:
+# https://hub.docker.com/r/library/rust/tags/
+image: "rust:latest"
+
+# Optional: Pick zero or more services to be used on all builds.
+# Only needed when using a docker container to run your tests in.
+# Check out: https://docs.gitlab.com/ee/ci/services/index.html
+# services:
+#   - mysql:latest
+#   - redis:latest
+#   - postgres:latest
+
+# Optional: Install a C compiler, cmake and git into the container.
+# You will often need this when you (or any of your dependencies) depends on C code.
+# before_script:
+#   - apt-get update -yqq
+#   - apt-get install -yqq --no-install-recommends build-essential
+
+# Use cargo to test the project
+test:cargo:
+  script:
+    - rustc --version && cargo --version  # Print version info for debugging
+    - cargo test --workspace --verbose
+
+# Optional: Use a third party library to generate gitlab junit reports
+# test:junit-report:
+#   script:
+#     Should be specified in Cargo.toml
+#     - cargo install junitify
+#     - cargo test -- --format=json -Z unstable-options --report-time | junitify --out $CI_PROJECT_DIR/tests/
+#   artifacts:
+#     when: always
+#     reports:
+#       junit: $CI_PROJECT_DIR/tests/*.xml
+
+#deploy:
+#  stage: deploy
+#  script: echo "Define your deployment script!"
+#  environment: production
diff --git a/Cargo.lock b/Cargo.lock
index 4f2514891aa5059baa087a36e542d4f66e7789ac..e723310ae6fecf75a986ac7315e8057b75ac5a6f 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -2,24 +2,392 @@
 # It is not intended for manual editing.
 version = 3
 
+[[package]]
+name = "adler"
+version = "1.0.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f26201604c87b1e01bd3d98f8d5d9a8fcbb815e8cedb41ffccbeb4bf593a35fe"
+
+[[package]]
+name = "android-tzdata"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e999941b234f3131b00bc13c22d06e8c5ff726d1b6318ac7eb276997bbb4fef0"
+
+[[package]]
+name = "android_system_properties"
+version = "0.1.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "819e7219dbd41043ac279b19830f2efc897156490d7fd6ea916720117ee66311"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "autocfg"
 version = "1.1.0"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "d468802bab17cbc0cc575e9b053f41e72aa36bfa6b7f55e3529ffa43161b97fa"
 
+[[package]]
+name = "bitflags"
+version = "1.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bef38d45163c2f1dde094a7dfd33ccf595c92905c8f8f4fdc18d06fb1037718a"
+
+[[package]]
+name = "bumpalo"
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a3e2c3daef883ecc1b5d58c15adae93470a91d425f3532ba1695849656af3fc1"
+
+[[package]]
+name = "bytemuck"
+version = "1.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "17febce684fd15d89027105661fec94afb475cb995fbc59d2865198446ba2eea"
+
+[[package]]
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+version = "1.4.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "14c189c53d098945499cdfa7ecc63567cf3886b3332b312a5b4585d8d3a6a610"
+
+[[package]]
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+version = "1.0.79"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "50d30906286121d95be3d479533b458f87493b30a4b5f79a607db8f5d11aa91f"
+
+[[package]]
+name = "cfg-if"
+version = "1.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "baf1de4339761588bc0619e3cbc0120ee582ebb74b53b4efbf79117bd2da40fd"
+
+[[package]]
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+version = "0.4.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "ec837a71355b28f6556dbd569b37b3f363091c0bd4b2e735674521b4c5fd9bc5"
+dependencies = [
+ "android-tzdata",
+ "iana-time-zone",
+ "js-sys",
+ "num-traits",
+ "time",
+ "wasm-bindgen",
+ "winapi",
+]
+
+[[package]]
+name = "cmake"
+version = "0.1.50"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a31c789563b815f77f4250caee12365734369f942439b7defd71e18a48197130"
+dependencies = [
+ "cc",
+]
+
+[[package]]
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+version = "1.1.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3d7b894f5411737b7867f4827955924d7c254fc9f4d91a6aad6b097804b1018b"
+
+[[package]]
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+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "194a7a9e6de53fa55116934067c844d9d749312f75c6f6d0980e8c252f8c2146"
+dependencies = [
+ "core-foundation-sys",
+ "libc",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e496a50fda8aacccc86d7529e2c1e0892dbd0f898a6b5645b5561b89c3210efa"
+
+[[package]]
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+dependencies = [
+ "bitflags",
+ "core-foundation",
+ "core-graphics-types",
+ "foreign-types",
+ "libc",
+]
+
+[[package]]
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+dependencies = [
+ "bitflags",
+ "core-foundation",
+ "libc",
+]
+
+[[package]]
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+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "99d74ada66e07c1cefa18f8abfba765b486f250de2e4a999e5727fc0dd4b4a25"
+dependencies = [
+ "core-foundation",
+ "core-graphics",
+ "foreign-types",
+ "libc",
+]
+
+[[package]]
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+checksum = "b540bd8bc810d3885c6ea91e2018302f68baba2129ab3e88f32389ee9370880d"
+dependencies = [
+ "cfg-if",
+]
+
+[[package]]
+name = "csv"
+version = "1.2.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "626ae34994d3d8d668f4269922248239db4ae42d538b14c398b74a52208e8086"
+dependencies = [
+ "csv-core",
+ "itoa",
+ "ryu",
+ "serde",
+]
+
+[[package]]
+name = "csv-core"
+version = "0.1.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2b2466559f260f48ad25fe6317b3c8dac77b5bdb5763ac7d9d6103530663bc90"
+dependencies = [
+ "memchr",
+]
+
+[[package]]
+name = "dirs-next"
+version = "2.0.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b98cf8ebf19c3d1b223e151f99a4f9f0690dca41414773390fc824184ac833e1"
+dependencies = [
+ "cfg-if",
+ "dirs-sys-next",
+]
+
+[[package]]
+name = "dirs-sys-next"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "4ebda144c4fe02d1f7ea1a7d9641b6fc6b580adcfa024ae48797ecdeb6825b4d"
+dependencies = [
+ "libc",
+ "redox_users",
+ "winapi",
+]
+
+[[package]]
+name = "dlib"
+version = "0.5.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "330c60081dcc4c72131f8eb70510f1ac07223e5d4163db481a04a0befcffa412"
+dependencies = [
+ "libloading",
+]
+
+[[package]]
+name = "dwrote"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "439a1c2ba5611ad3ed731280541d36d2e9c4ac5e7fb818a27b604bdc5a6aa65b"
+dependencies = [
+ "lazy_static",
+ "libc",
+ "winapi",
+ "wio",
+]
+
+[[package]]
+name = "either"
+version = "1.9.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a26ae43d7bcc3b814de94796a5e736d4029efb0ee900c12e2d54c993ad1a1e07"
+
+[[package]]
+name = "fdeflate"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d329bdeac514ee06249dabc27877490f17f5d371ec693360768b838e19f3ae10"
+dependencies = [
+ "simd-adler32",
+]
+
 [[package]]
 name = "fixedbitset"
 version = "0.4.2"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "0ce7134b9999ecaf8bcd65542e436736ef32ddca1b3e06094cb6ec5755203b80"
 
+[[package]]
+name = "flate2"
+version = "1.0.26"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3b9429470923de8e8cbd4d2dc513535400b4b3fef0319fb5c4e1f520a7bef743"
+dependencies = [
+ "crc32fast",
+ "miniz_oxide",
+]
+
+[[package]]
+name = "float-ord"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "7bad48618fdb549078c333a7a8528acb57af271d0433bdecd523eb620628364e"
+
+[[package]]
+name = "font-kit"
+version = "0.11.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "21fe28504d371085fae9ac7a3450f0b289ab71e07c8e57baa3fb68b9e57d6ce5"
+dependencies = [
+ "bitflags",
+ "byteorder",
+ "core-foundation",
+ "core-graphics",
+ "core-text",
+ "dirs-next",
+ "dwrote",
+ "float-ord",
+ "freetype",
+ "lazy_static",
+ "libc",
+ "log",
+ "pathfinder_geometry",
+ "pathfinder_simd",
+ "walkdir",
+ "winapi",
+ "yeslogic-fontconfig-sys",
+]
+
+[[package]]
+name = "foreign-types"
+version = "0.3.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f6f339eb8adc052cd2ca78910fda869aefa38d22d5cb648e6485e4d3fc06f3b1"
+dependencies = [
+ "foreign-types-shared",
+]
+
+[[package]]
+name = "foreign-types-shared"
+version = "0.1.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "00b0228411908ca8685dba7fc2cdd70ec9990a6e753e89b6ac91a84c40fbaf4b"
+
+[[package]]
+name = "freetype"
+version = "0.7.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bee38378a9e3db1cc693b4f88d166ae375338a0ff75cb8263e1c601d51f35dc6"
+dependencies = [
+ "freetype-sys",
+ "libc",
+]
+
+[[package]]
+name = "freetype-sys"
+version = "0.13.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a37d4011c0cc628dfa766fcc195454f4b068d7afdc2adfd28861191d866e731a"
+dependencies = [
+ "cmake",
+ "libc",
+ "pkg-config",
+]
+
+[[package]]
+name = "getrandom"
+version = "0.2.10"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "be4136b2a15dd319360be1c07d9933517ccf0be8f16bf62a3bee4f0d618df427"
+dependencies = [
+ "cfg-if",
+ "libc",
+ "wasi 0.11.0+wasi-snapshot-preview1",
+]
+
+[[package]]
+name = "gif"
+version = "0.12.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "80792593675e051cf94a4b111980da2ba60d4a83e43e0048c5693baab3977045"
+dependencies = [
+ "color_quant",
+ "weezl",
+]
+
 [[package]]
 name = "hashbrown"
 version = "0.12.3"
 source = "registry+https://github.com/rust-lang/crates.io-index"
 checksum = "8a9ee70c43aaf417c914396645a0fa852624801b24ebb7ae78fe8272889ac888"
 
+[[package]]
+name = "iana-time-zone"
+version = "0.1.57"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2fad5b825842d2b38bd206f3e81d6957625fd7f0a361e345c30e01a0ae2dd613"
+dependencies = [
+ "android_system_properties",
+ "core-foundation-sys",
+ "iana-time-zone-haiku",
+ "js-sys",
+ "wasm-bindgen",
+ "windows",
+]
+
+[[package]]
+name = "iana-time-zone-haiku"
+version = "0.1.2"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "f31827a206f56af32e590ba56d5d2d085f558508192593743f16b2306495269f"
+dependencies = [
+ "cc",
+]
+
+[[package]]
+name = "image"
+version = "0.24.6"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "527909aa81e20ac3a44803521443a765550f09b5130c2c2fa1ea59c2f8f50a3a"
+dependencies = [
+ "bytemuck",
+ "byteorder",
+ "color_quant",
+ "jpeg-decoder",
+ "num-rational",
+ "num-traits",
+ "png",
+]
+
 [[package]]
 name = "indexmap"
 version = "1.9.3"
@@ -30,6 +398,64 @@ dependencies = [
  "hashbrown",
 ]
 
+[[package]]
+name = "itertools"
+version = "0.10.5"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b0fd2260e829bddf4cb6ea802289de2f86d6a7a690192fbe91b3f46e0f2c8473"
+dependencies = [
+ "either",
+]
+
+[[package]]
+name = "itoa"
+version = "1.0.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "af150ab688ff2122fcef229be89cb50dd66af9e01a4ff320cc137eecc9bacc38"
+
+[[package]]
+name = "jpeg-decoder"
+version = "0.3.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "bc0000e42512c92e31c2252315bda326620a4e034105e900c98ec492fa077b3e"
+
+[[package]]
+name = "js-sys"
+version = "0.3.64"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c5f195fe497f702db0f318b07fdd68edb16955aed830df8363d837542f8f935a"
+dependencies = [
+ "wasm-bindgen",
+]
+
+[[package]]
+name = "lazy_static"
+version = "1.4.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e2abad23fbc42b3700f2f279844dc832adb2b2eb069b2df918f455c4e18cc646"
+
+[[package]]
+name = "libc"
+version = "0.2.147"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b4668fb0ea861c1df094127ac5f1da3409a82116a4ba74fca2e58ef927159bb3"
+
+[[package]]
+name = "libloading"
+version = "0.8.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "d580318f95776505201b28cf98eb1fa5e4be3b689633ba6a3e6cd880ff22d8cb"
+dependencies = [
+ "cfg-if",
+ "windows-sys",
+]
+
+[[package]]
+name = "log"
+version = "0.4.19"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "b06a4cde4c0f271a446782e3eff8de789548ce57dbc8eca9292c27f4a42004b4"
+
 [[package]]
 name = "matrixmultiply"
 version = "0.3.7"
@@ -40,6 +466,22 @@ dependencies = [
  "rawpointer",
 ]
 
+[[package]]
+name = "memchr"
+version = "2.5.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2dffe52ecf27772e601905b7522cb4ef790d2cc203488bbd0e2fe85fcb74566d"
+
+[[package]]
+name = "miniz_oxide"
+version = "0.7.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "e7810e0be55b428ada41041c41f32c9f1a42817901b4ccf45fa3d4b6561e74c7"
+dependencies = [
+ "adler",
+ "simd-adler32",
+]
+
 [[package]]
 name = "ndarray"
 version = "0.15.6"
@@ -54,14 +496,27 @@ dependencies = [
 ]
 
 [[package]]
-name = "ndarray-interp"
-version = "0.1.1"
+name = "ndarray-stats"
+version = "0.5.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "16eb7477aebbc0c82bcc496d2d727e76875f800060a7eeac125d1f884a129750"
+checksum = "af5a8477ac96877b5bd1fd67e0c28736c12943aba24eda92b127e036b0c8f400"
 dependencies = [
+ "indexmap",
+ "itertools",
  "ndarray",
+ "noisy_float",
+ "num-integer",
+ "num-traits",
+ "rand",
+]
+
+[[package]]
+name = "noisy_float"
+version = "0.2.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "978fe6e6ebc0bf53de533cd456ca2d9de13de13856eda1518a285d7705a213af"
+dependencies = [
  "num-traits",
- "thiserror",
 ]
 
 [[package]]
@@ -83,25 +538,73 @@ dependencies = [
  "num-traits",
 ]
 
+[[package]]
+name = "num-rational"
+version = "0.4.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "0638a1c9d0a3c0914158145bc76cff373a75a627e6ecbfb71cbe6f453a5a19b0"
+dependencies = [
+ "autocfg",
+ "num-integer",
+ "num-traits",
+]
+
 [[package]]
 name = "num-traits"
-version = "0.2.15"
+version = "0.2.16"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "578ede34cf02f8924ab9447f50c28075b4d3e5b269972345e7e0372b38c6cdcd"
+checksum = "f30b0abd723be7e2ffca1272140fac1a2f084c77ec3e123c192b66af1ee9e6c2"
 dependencies = [
  "autocfg",
 ]
 
+[[package]]
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+ "dlib",
+ "once_cell",
+ "pkg-config",
+]
diff --git a/Cargo.toml b/Cargo.toml
index b3002e4bf5ddcc587621d839c34cf19db71e114a..635c1137805fc0ebab2556e76ed49288df5036e5 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -16,4 +16,6 @@ uom = "0"
 
 # for spectrum
 ndarray="0"
-ndarray-interp="0"
\ No newline at end of file
+ndarray-stats="0"
+csv="1"
+plotters="0"
diff --git a/NE03B.csv b/NE03B.csv
new file mode 100644
index 0000000000000000000000000000000000000000..f29e1ebdbbbd29e82bdd6a373b28e938d84a669d
--- /dev/null
+++ b/NE03B.csv
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+14690.89389;2.009E-01
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+14761.12461;2.008E-01
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+15980.13377;2.001E-01
+15989.82334;2.001E-01
+16000.04436;2.001E-01
diff --git a/examples/beam_combine_test.rs b/examples/beam_combine_test.rs
new file mode 100644
index 0000000000000000000000000000000000000000..eda3b8209a604d4fd199d3578f439c18d73ea273
--- /dev/null
+++ b/examples/beam_combine_test.rs
@@ -0,0 +1,56 @@
+use std::fs::File;
+use std::io::Write;
+
+use opossum::{
+    analyzer::AnalyzerEnergy,
+    error::OpossumError,
+    lightdata::{DataEnergy, LightData},
+    nodes::{BeamSplitter, Detector, FilterType, IdealFilter, Source},
+    spectrum::{create_he_ne_spectrum, create_nd_glass_spectrum, Spectrum},
+    OpticScenery,
+};
+
+fn main() -> Result<(), OpossumError> {
+    let mut scenery = OpticScenery::new();
+    scenery.set_description("beam combiner demo");
+
+    let i_s1 = scenery.add_element(
+        "Source 1",
+        Source::new(LightData::Energy(DataEnergy {
+            spectrum: create_he_ne_spectrum(1.0),
+        })),
+    );
+    let i_s2 = scenery.add_element(
+        "Source 2",
+        Source::new(LightData::Energy(DataEnergy {
+            spectrum: create_nd_glass_spectrum(1.0),
+        })),
+    );
+    let i_bs = scenery.add_element("Beam splitter", BeamSplitter::new(0.5));
+    let filter_spectrum = Spectrum::from_csv("NE03B.csv")?;
+    let i_f = scenery.add_element(
+        "Filter",
+        IdealFilter::new(FilterType::Spectrum(filter_spectrum))?,
+    );
+    let i_d1 = scenery.add_element("Detector 1", Detector::default());
+
+    scenery.connect_nodes(i_s1, "out1", i_bs, "input1")?;
+    scenery.connect_nodes(i_s2, "out1", i_bs, "input2")?;
+    scenery.connect_nodes(i_bs, "out1_trans1_refl2", i_f, "front")?;
+    scenery.connect_nodes(i_f, "rear", i_d1, "in1")?;
+
+    let path = "beam_combiner.dot";
+    let mut output = File::create(path).unwrap();
+    write!(output, "{}", scenery.to_dot()).unwrap();
+
+    scenery.report();
+    println!("");
+    let mut analyzer = AnalyzerEnergy::new(&scenery);
+    print!("Analyze...");
+    analyzer.analyze()?;
+    println!("Sucessful");
+    println!("");
+    scenery.report();
+
+    Ok(())
+}
diff --git a/examples/source_detector_test.rs b/examples/filter_test.rs
similarity index 73%
rename from examples/source_detector_test.rs
rename to examples/filter_test.rs
index d5838c5f94df43d49dab174bf2e436e25a15bdc3..ade6386bc273307c0f94f2dc44b52a3ba1194a14 100644
--- a/examples/source_detector_test.rs
+++ b/examples/filter_test.rs
@@ -1,27 +1,31 @@
 use std::fs::File;
 use std::io::Write;
-use uom::si::{energy::joule, f64::Energy};
 
 use opossum::{
     analyzer::AnalyzerEnergy,
     error::OpossumError,
     lightdata::{DataEnergy, LightData},
-    nodes::{BeamSplitter, Detector, IdealFilter, Source},
-    optic_scenery::OpticScenery,
+    nodes::{BeamSplitter, Detector, FilterType, IdealFilter, Source},
+    spectrum::{create_he_ne_spectrum, Spectrum},
+    OpticScenery,
 };
 
 fn main() -> Result<(), OpossumError> {
     let mut scenery = OpticScenery::new();
-    scenery.set_description("src - detector demo".into());
+    scenery.set_description("filter system demo");
 
     let i_s = scenery.add_element(
         "Source",
         Source::new(LightData::Energy(DataEnergy {
-            energy: Energy::new::<joule>(1.0),
+            spectrum: create_he_ne_spectrum(1.0),
         })),
     );
     let i_bs = scenery.add_element("Beam splitter", BeamSplitter::new(0.6));
-    let i_f = scenery.add_element("Filter", IdealFilter::new(0.5)?);
+    let filter_spectrum = Spectrum::from_csv("NE03B.csv")?;
+    let i_f = scenery.add_element(
+        "Filter",
+        IdealFilter::new(FilterType::Spectrum(filter_spectrum))?,
+    );
     let i_d1 = scenery.add_element("Detector 1", Detector::default());
     let i_d2 = scenery.add_element("Detector 2", Detector::default());
 
diff --git a/examples/graph_port_test.rs b/examples/graph_port_test.rs
index f25bf1c4adfa404548ca6a3679c82161549fb29c..d3b7a958e83e9d79c4cd417cf93449e27910e111 100644
--- a/examples/graph_port_test.rs
+++ b/examples/graph_port_test.rs
@@ -1,14 +1,14 @@
 use opossum::error::OpossumError;
-use opossum::nodes::{Dummy, BeamSplitter};
+use opossum::nodes::{BeamSplitter, Dummy};
 use opossum::optic_node::OpticNode;
-use opossum::optic_scenery::OpticScenery;
+use opossum::OpticScenery;
 
 use std::fs::File;
 use std::io::Write;
 
-fn main() -> Result <(), OpossumError> {
+fn main() -> Result<(), OpossumError> {
     let mut scenery = OpticScenery::new();
-    scenery.set_description("Fancy Graph with Ports".into());
+    scenery.set_description("Fancy Graph with Ports");
 
     let in1 = scenery.add_node(OpticNode::new("Input", Dummy));
     let out1 = scenery.add_node(OpticNode::new("Output", Dummy));
@@ -16,7 +16,7 @@ fn main() -> Result <(), OpossumError> {
     let bs2 = scenery.add_node(OpticNode::new("Beamsplitter 2", BeamSplitter::default()));
     let m1 = scenery.add_node(OpticNode::new("Mirror 1", Dummy));
     let m2 = scenery.add_node(OpticNode::new("Mirror 2", Dummy));
-    
+
     scenery.connect_nodes(in1, "rear", bs1, "input1")?;
     scenery.connect_nodes(bs1, "out1_trans1_refl2", m1, "front")?;
     scenery.connect_nodes(bs1, "out2_trans2_refl1", m2, "front")?;
@@ -26,7 +26,6 @@ fn main() -> Result <(), OpossumError> {
     scenery.connect_nodes(bs2, "out1_trans1_refl2", out1, "front")?;
     scenery.connect_nodes(bs2, "out2_trans2_refl1", out1, "front")?;
 
-
     let path = "graph_w_ports.dot";
     let mut output = File::create(path).unwrap();
     write!(output, "{}", scenery.to_dot()?).unwrap();
diff --git a/examples/lens_test.rs b/examples/lens_test.rs
index f744c1b2a197e8821f897fd2b0b99ee6221ea0ff..a32de638931f1419a79f28a2f880f56baa80f2b0 100644
--- a/examples/lens_test.rs
+++ b/examples/lens_test.rs
@@ -1,23 +1,22 @@
-use opossum::{
-    nodes::{RealLens, Source, Detector},
-    optic_scenery::OpticScenery, error::OpossumError,
-};
+use opossum::nodes::{RealLens, Source};
+use opossum::{nodes::Detector, OpticScenery};
 use std::fs::File;
 use std::io::Write;
 
+use opossum::error::OpossumError;
+
 fn main() -> Result<(), OpossumError> {
     let mut scenery = OpticScenery::new();
     scenery.set_description("Lens Ray-trace test".into());
     let src = scenery.add_element("Source", Source::default());
     let l1 = scenery.add_element("Lens 1", RealLens::default());
     let l2 = scenery.add_element("Lens 2", RealLens::default());
-    let det=scenery.add_element("Detector", Detector::default());
+    let det = scenery.add_element("Detector", Detector::default());
 
     scenery.connect_nodes(src, "out1", l1, "in1")?;
     scenery.connect_nodes(l1, "out1", l2, "in1")?;
     scenery.connect_nodes(l2, "out1", det, "in1")?;
 
-
     let path = "lens_system.dot";
     let mut output = File::create(path).unwrap();
     write!(output, "{}", scenery.to_dot()?).unwrap();
diff --git a/examples/michaelson.rs b/examples/michaelson.rs
index fdb1efbd5b9cbbf5c96767232502f46eead54543..19376b17a2aaac023dd91d56b40368cbffd9ce4b 100644
--- a/examples/michaelson.rs
+++ b/examples/michaelson.rs
@@ -1,32 +1,32 @@
 use opossum::{
-    nodes::{BeamSplitter, Dummy, NodeReference, Source, Detector},
-    optic_scenery::OpticScenery, error::OpossumError,
+    error::OpossumError,
+    nodes::{BeamSplitter, Detector, Dummy, NodeReference, Source},
+    OpticScenery,
 };
 use std::fs::File;
 use std::io::Write;
 
 fn main() -> Result<(), OpossumError> {
     let mut scenery = OpticScenery::new();
-    scenery.set_description("Michaelson interferomater".into());
+    scenery.set_description("Michaelson interferomater");
     let src = scenery.add_element("Source", Source::default());
     let bs = scenery.add_element("Beamspliiter", BeamSplitter::default());
     let sample = scenery.add_element("sample", Dummy);
-    let rf = NodeReference::new(scenery.node(sample)?);
-    let r_sample=scenery.add_node(rf);
+    let rf = NodeReference::from_node(scenery.node(sample)?);
+    let r_sample = scenery.add_node(rf);
     let m1 = scenery.add_element("Mirror", Dummy);
     let m2 = scenery.add_element("Mirror", Dummy);
-    let rf = NodeReference::new(scenery.node(bs)?);
+    let rf = NodeReference::from_node(scenery.node(bs)?);
     let r_bs = scenery.add_node(rf);
-    let det=scenery.add_element("Detector", Detector::default());
+    let det = scenery.add_element("Detector", Detector::default());
 
     scenery.connect_nodes(src, "out1", bs, "input1")?;
-    scenery
-        .connect_nodes(bs, "out1_trans1_refl2", sample, "front")?;
+    scenery.connect_nodes(bs, "out1_trans1_refl2", sample, "front")?;
     scenery.connect_nodes(sample, "rear", m1, "front")?;
-    scenery.connect_nodes(m1,"rear", r_sample, "front")?;
+    scenery.connect_nodes(m1, "rear", r_sample, "front")?;
     scenery.connect_nodes(r_sample, "rear", r_bs, "input1")?;
-    scenery.connect_nodes(bs,"out2_trans2_refl1", m2, "front")?;
-    scenery.connect_nodes(m2,"rear", r_bs,"input2")?;
+    scenery.connect_nodes(bs, "out2_trans2_refl1", m2, "front")?;
+    scenery.connect_nodes(m2, "rear", r_bs, "input2")?;
     scenery.connect_nodes(r_bs, "out1_trans1_refl2", det, "in1")?;
 
     let path = "michaelson.dot";
diff --git a/examples/opticscenery.rs b/examples/opticscenery.rs
index e1a3f70c3dece0b20cb9f3fd5d4bfb6089ca2a84..8cd1a6f11f79eb61bb0798e6da3b8568877103e3 100644
--- a/examples/opticscenery.rs
+++ b/examples/opticscenery.rs
@@ -1,6 +1,6 @@
 use opossum::error::OpossumError;
 use opossum::nodes::Dummy;
-use opossum::optic_scenery::OpticScenery;
+use opossum::OpticScenery;
 
 use std::fs::File;
 use std::io::Write;
@@ -8,7 +8,7 @@ use std::io::Write;
 fn main() -> Result<(), OpossumError> {
     println!("opticscenery example");
     let mut scenery = OpticScenery::new();
-    scenery.set_description("OpticScenery demo".into());
+    scenery.set_description("OpticScenery demo");
     println!("default opticscenery: {:?}", scenery);
     println!("export to `dot` format: {}", scenery.to_dot()?);
     let node1 = scenery.add_element("my optic", Dummy);
diff --git a/examples/pa_doublepass_graph.rs b/examples/pa_doublepass_graph.rs
index 4df02fe82347ec88abe869ac293f564d926b24ed..b08a30bbf6db713797680e5b2650114cb9f6b120 100644
--- a/examples/pa_doublepass_graph.rs
+++ b/examples/pa_doublepass_graph.rs
@@ -1,20 +1,20 @@
 use opossum::analyzer::AnalyzerEnergy;
 use opossum::error::OpossumError;
 use opossum::nodes::{Dummy, NodeReference};
-use opossum::optic_scenery::OpticScenery;
+use opossum::OpticScenery;
 use std::fs::File;
 use std::io::Write;
 
 fn main() -> Result<(), OpossumError> {
     let mut scenery = OpticScenery::new();
-    scenery.set_description("PreAmp Doublepass section".into());
+    scenery.set_description("PreAmp Doublepass section");
     //let n0 = scenery.add_element("LightSource", Source::default());
     let n1 = scenery.add_element("TFP", Dummy);
     let n2 = scenery.add_element("19mm amp", Dummy);
     //let n3 = scenery.add_element("Faraday", Dummy);
     let n4 = scenery.add_element("0° mirror", Dummy);
 
-    let mut node = NodeReference::new(scenery.node(n1).unwrap());
+    let mut node = NodeReference::from_node(scenery.node(n1).unwrap());
     node.set_inverted(true);
     let n1r = scenery.add_node(node);
 
@@ -22,7 +22,7 @@ fn main() -> Result<(), OpossumError> {
     // node.set_inverted(true);
     // let n3r = scenery.add_node(node);
 
-    let mut node = NodeReference::new(scenery.node(n2)?);
+    let mut node = NodeReference::from_node(scenery.node(n2)?);
     node.set_inverted(true);
     let n2r = scenery.add_node(node);
 
diff --git a/examples/spectrum_test.rs b/examples/spectrum_test.rs
index 0208300345a513bcc5b09739b8cb1685411e1380..944cb2f28c9c89902480a4e8e08954620bd27e5b 100644
--- a/examples/spectrum_test.rs
+++ b/examples/spectrum_test.rs
@@ -1,15 +1,45 @@
 use opossum::error::OpossumError;
-use opossum::spectrum::Spectrum;
-use uom::si::energy::joule;
-use uom::si::f64::Energy;
+use opossum::spectrum::{create_visible_spectrum, Spectrum};
 use uom::si::{f64::Length, length::nanometer};
 
 fn main() -> Result<(), OpossumError> {
     let mut s = Spectrum::new(
-        Length::new::<nanometer>(400.0)..Length::new::<nanometer>(410.0),
-        Length::new::<nanometer>(1.0),
+        Length::new::<nanometer>(400.0)..Length::new::<nanometer>(450.0),
+        Length::new::<nanometer>(0.1),
     )?;
-    s.set_single_peak(Length::new::<nanometer>(409.0), Energy::new::<joule>(1.0))?;
-    println!("{}", s);
+    s.add_lorentzian_peak(
+        Length::new::<nanometer>(415.0),
+        Length::new::<nanometer>(3.2),
+        2.0,
+    )?;
+
+    let mut s2 = Spectrum::new(
+        Length::new::<nanometer>(400.0)..Length::new::<nanometer>(450.0),
+        Length::new::<nanometer>(2.1),
+    )?;
+    s2.add_lorentzian_peak(
+        Length::new::<nanometer>(430.0),
+        Length::new::<nanometer>(1.2),
+        0.5,
+    )?;
+    s.add(&s2);
+
+    let mut s3 = Spectrum::new(
+        Length::new::<nanometer>(400.0)..Length::new::<nanometer>(450.0),
+        Length::new::<nanometer>(0.05),
+    )?;
+    s3.add_lorentzian_peak(
+        Length::new::<nanometer>(420.0),
+        Length::new::<nanometer>(0.3),
+        0.02,
+    )?;
+    s.sub(&s3);
+    s.to_plot("spectrum.svg");
+
+    let s4 = Spectrum::from_csv("NE03B.csv")?;
+    s4.to_plot("ne03b_raw.svg");
+    let mut s5 = create_visible_spectrum();
+    s5.resample(&s4);
+    s5.to_plot("ne03b.svg");
     Ok(())
 }
diff --git a/examples/structtest.rs b/examples/structtest.rs
deleted file mode 100644
index 37b9798b6febf8646d580b528a946f2129425015..0000000000000000000000000000000000000000
--- a/examples/structtest.rs
+++ /dev/null
@@ -1,58 +0,0 @@
-struct OpticDummy;
-
-struct OpticIdealLens {
-  focal_length: f64,
-}
-impl OpticIdealLens {
-  pub fn new(focal_length: f64) -> Self {
-    Self{focal_length}
-  }
-}
-trait Optical {
-    fn analyze(&self) {
-      println!("generic analyze");
-    }
-}
-impl Optical for OpticDummy {
-  fn analyze(&self) {
-      println!("optic dummy analyze");
-  }
-}
-impl Optical for OpticIdealLens {
-  fn analyze(&self) {
-      println!("ideal lens analyze. f={}",self.focal_length);
-  }
-}
-struct OpticNode<T: Optical> {
-  name: String,
-  node: T
-}
-impl <T: Optical> OpticNode<T> {
-  pub fn new(name: &str, t: T) -> Self {
-    Self{name: name.into(), node : t}
-  }
-  // pub fn node_mut(&mut self) -> &mut T {
-  //   &mut self.node
-  // }
-  pub fn analyze(&mut self) {
-    print!("Analyze element {}: ",self.name); 
-    self.node.analyze();
-  }
-}
-
-impl OpticNode<OpticIdealLens> {
-  pub fn set_focal_length(&mut self, f: f64)  {
-    self.node.focal_length=f;
-  }
-}
-fn main() {
-  let mut node=OpticNode::new("Test1", OpticDummy);
-  node.analyze();
-
-  let mut node=OpticNode::new("Test2", OpticIdealLens::new(1.23));
-  node.analyze();
-  node.set_focal_length(3.45);
-  node.analyze();
-
-  // let g: DiGraph<OpticNode<>,()>=DiGraph::new(); // does not work since it needs a concrete type here....
-}
\ No newline at end of file
diff --git a/examples/structtest2.rs b/examples/structtest2.rs
deleted file mode 100644
index 02ba3d07c10ae43bd06c5106af3e6cd309445e83..0000000000000000000000000000000000000000
--- a/examples/structtest2.rs
+++ /dev/null
@@ -1,60 +0,0 @@
-use petgraph::prelude::DiGraph;
-trait Optical {
-  fn analyze(&self) {
-    println!("generic analyze");
-  }
-}
-
-struct OpticIdealLens {
-  focal_length: f64,
-}
-
-impl OpticIdealLens {
-  pub fn new(focal_length: f64) -> Self {
-    Self{focal_length}
-  }
-}
-
-impl Optical for OpticIdealLens {
-  fn analyze(&self) {
-      println!("ideal lens analyze: f={}",self.focal_length);
-  }
-}
-enum NodeType {
-  Dummy,
-  IdealLens(OpticIdealLens),
-  SimpleElement(f64)
-}
-impl NodeType {
-  fn analyze(&self) {
-    match self {
-        NodeType::Dummy => println!("dummy -> nothing to do here"),
-        NodeType::IdealLens(n) => n.analyze(),
-        _ => println!("not covered")
-    }
-  }
-}
-struct OpticNode {
-  name: String,
-  node: NodeType
-}
-
-impl OpticNode {
-  fn new(name: &str, node_type: NodeType) -> Self {
-    Self{name: name.into(), node: node_type}
-  }
-  fn analyze(&self) {
-    print!("Analyze {}: ",self.name);
-    self.node.analyze();
-  }
-}
-fn main() {
-  let node=OpticNode::new("Test1",NodeType::Dummy);
-  node.analyze();
-  let node=OpticNode::new("Test2",NodeType::IdealLens(OpticIdealLens::new(1.23)));
-  node.analyze();
-  let node=OpticNode::new("Test2",NodeType::SimpleElement(1.23));
-  node.analyze();
-
-  let _p:DiGraph<OpticNode,()> = DiGraph::new();
-}
\ No newline at end of file
diff --git a/examples/trait_test.rs b/examples/trait_test.rs
deleted file mode 100644
index cffc7d6d46a9d6344b6e483afb8efa6e77414c30..0000000000000000000000000000000000000000
--- a/examples/trait_test.rs
+++ /dev/null
@@ -1,55 +0,0 @@
-trait Analyzer {}
-
-struct AnalyzerEnergy{}
-impl Analyzer for AnalyzerEnergy {}
-
-struct AnalyzerRay{}
-impl Analyzer for AnalyzerRay {}
-
-trait Analyzable<T: Analyzer> {
-  fn analyze(&self, _analyzer: T) {
-    println!("Default Analyze");
-  }
-}
-
-trait Optical {}
-struct Lens {}
-
-impl Analyzable<AnalyzerEnergy> for Lens {
-    fn analyze(&self, _analyzer: AnalyzerEnergy) {
-        println!("Lens Analyze Energy");
-      }
-}
-
-impl Analyzable<AnalyzerRay> for Lens {
-  fn analyze(&self, _analyzer: AnalyzerRay) {
-      println!("Lens Analyze Ray");
-    }
-}
-impl Optical for Lens {}
-struct Mirror {}
-
-impl Analyzable<AnalyzerEnergy> for Mirror {
-  fn analyze(&self, _analyzer: AnalyzerEnergy) {
-    println!("Mirror Analyze Energy");
-  }
-}
-
-impl Analyzable<AnalyzerRay> for Mirror {
-  fn analyze(&self, _analyzer: AnalyzerRay) {
-    println!("Mirror Analyze Ray");
-  }
-}
-
-impl Optical for Mirror {}
-fn main() {
-  let lens= Lens{}; 
-  let mirror= Mirror{};
-
-  let _comp: Vec<Box<dyn Optical>> = vec![Box::new(lens), Box::new(mirror)];
-
-  //comp[0].analyze(AnalyzerEnergy{});
-  // lens.analyze(AnalyzerRay{});
-  // mirror.analyze(AnalyzerEnergy{});
-  // mirror.analyze(AnalyzerRay{});
-}
\ No newline at end of file
diff --git a/examples/trait_test2.rs b/examples/trait_test2.rs
deleted file mode 100644
index f7e44ee627f05dd370bfe0c0eb19140a41a61694..0000000000000000000000000000000000000000
--- a/examples/trait_test2.rs
+++ /dev/null
@@ -1,71 +0,0 @@
-type Scenery = Vec<Box<dyn Optical>>;
-
-pub enum AnalyzerType {
-    Energy,
-    Ray,
-}
-
-trait Analyzer {
-    fn analyze(&self, _scenery: &Scenery) {
-        println!("No implemented");
-    }
-}
-
-struct AnalyzerEnergy {}
-
-impl Analyzer for AnalyzerEnergy {
-    fn analyze(&self, scenery: &Scenery) {
-        for element in scenery.iter() {
-            element.analyze(AnalyzerType::Energy)
-        }
-    }
-}
-
-struct AnalyzerRay {}
-
-impl Analyzer for AnalyzerRay {
-  fn analyze(&self, scenery: &Scenery) {
-    for element in scenery.iter() {
-        element.analyze(AnalyzerType::Ray)
-    }
-}
-}
-trait Optical {
-    fn analyze(&self, _anatype: AnalyzerType) {
-        println!("Default");
-    }
-}
-struct Lens {}
-
-impl Optical for Lens {
-    fn analyze(&self, anatype: AnalyzerType) {
-        print!("Lens: ");
-        match anatype {
-            AnalyzerType::Energy => println!("Energy"),
-            AnalyzerType::Ray => println!("Ray"),
-        }
-    }
-}
-struct Mirror {}
-
-impl Optical for Mirror {
-    fn analyze(&self, anatype: AnalyzerType) {
-        print!("Mirror: ");
-        match anatype {
-            AnalyzerType::Energy => println!("Energy"),
-            AnalyzerType::Ray => println!("Ray"),
-        }
-    }
-}
-fn main() {
-    let lens = Lens {};
-    let mirror = Mirror {};
-
-    let comp: Scenery = vec![Box::new(lens), Box::new(mirror)];
-
-    let a1 = AnalyzerEnergy {};
-    let a2 = AnalyzerRay {};
-
-    a1.analyze(&comp);
-    a2.analyze(&comp);
-}
diff --git a/examples/uopa_graph.rs b/examples/uopa_graph.rs
index e2accabf8137a929abdfc54a395b6a924d0d09b9..b19f9ebaa91bd265f0d39960b4ab52c8eafd13b8 100644
--- a/examples/uopa_graph.rs
+++ b/examples/uopa_graph.rs
@@ -1,7 +1,7 @@
 use opossum::analyzer::AnalyzerEnergy;
 use opossum::error::OpossumError;
 use opossum::nodes::{BeamSplitter, Dummy};
-use opossum::optic_scenery::OpticScenery;
+use opossum::OpticScenery;
 
 use std::fs::File;
 use std::io::Write;
@@ -10,7 +10,7 @@ fn main() -> Result<(), OpossumError> {
     println!("PHELIX uOPA opticscenery example");
     let mut scenery = OpticScenery::new();
 
-    scenery.set_description("PHELIX uOPA".into());
+    scenery.set_description("PHELIX uOPA");
     println!("default opticscenery: {:?}", scenery);
     println!("export to `dot` format: {}", scenery.to_dot()?);
 
diff --git a/logo/opossum.svg b/logo/opossum.svg
index 02da7346c8bddf412a3e7dce93ab155590ff38ad..139e27ec2a2149ccd5173a10223dcd5f17f5ff66 100644
--- a/logo/opossum.svg
+++ b/logo/opossum.svg
@@ -4,11 +4,11 @@
 <svg
    version="1.1"
    id="svg870"
-   width="500.24539"
-   height="466.55075"
-   viewBox="0 0 500.24539 466.55075"
-   sodipodi:docname="Unbenannt.svg"
-   inkscape:version="1.1.2 (0a00cf5339, 2022-02-04)"
+   width="504.50769"
+   height="467.74179"
+   viewBox="0 0 504.50769 467.74179"
+   sodipodi:docname="opossum.svg"
+   inkscape:version="1.2.2 (732a01da63, 2022-12-09)"
    xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
    xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
    xmlns="http://www.w3.org/2000/svg"
@@ -23,28 +23,67 @@
      inkscape:pageshadow="2"
      inkscape:pageopacity="0.0"
      inkscape:pagecheckerboard="0"
-     showgrid="false"
+     showgrid="true"
      fit-margin-top="0"
      fit-margin-left="0"
      fit-margin-right="0"
      fit-margin-bottom="0"
-     inkscape:zoom="1.5195312"
-     inkscape:cx="249.41902"
-     inkscape:cy="237.24422"
-     inkscape:window-width="2560"
-     inkscape:window-height="1376"
-     inkscape:window-x="0"
-     inkscape:window-y="27"
+     inkscape:zoom="1.1734241"
+     inkscape:cx="243.30504"
+     inkscape:cy="281.22824"
+     inkscape:window-width="1680"
+     inkscape:window-height="997"
+     inkscape:window-x="-8"
+     inkscape:window-y="-8"
      inkscape:window-maximized="1"
-     inkscape:current-layer="g876" />
+     inkscape:current-layer="g876"
+     inkscape:showpageshadow="2"
+     inkscape:deskcolor="#d1d1d1">
+    <inkscape:grid
+       type="xygrid"
+       id="grid239"
+       originx="2.2538492"
+       originy="2.7415204" />
+  </sodipodi:namedview>
   <g
      inkscape:groupmode="layer"
      inkscape:label="Image"
      id="g876"
-     transform="translate(-134.15938,-146.9612)">
+     transform="translate(-131.90553,-144.21967)">
     <path
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+       id="path568"
+       sodipodi:nodetypes="cssssssccc" />
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+       id="path564"
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+    <path
+       style="fill:#000000"
+       d="m 384.15938,611.9612 c -12.6902,-0.043 -21.0961,-4.40156 -30,-10 -8.9039,-5.59844 -25,-20 -25,-25 15,5 25,15 35,5 5,-5 5,-5 -5,-10 -10,-5 -19.82509,-9.58142 -25,-20 -5.17491,-10.41859 -5,-20 0,-30 5,-10 25,-30 50,-30 25,0 45,20 50,30 5,10 5,19.99999 0,30 -5,10 -15,15 -25,20 -10,5 -10,5 -5,10 10,10 20,-10e-6 35,-5 0,5 -15,20 -25,25 -10,5 -17.3098,10.04302 -30,10 z"
+       id="path1035"
+       sodipodi:nodetypes="zzcczzzzzzzcczz" />
+    <circle
+       style="fill:#000000;stroke:none;stroke-width:4.7811"
+       id="path293"
+       cx="254.15938"
+       cy="396.96121"
+       r="35" />
+    <circle
+       style="fill:#000000;stroke:none;stroke-width:4.7811"
+       id="path293-5"
+       cx="504.15939"
+       cy="396.96121"
+       r="35" />
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+       style="fill:#000000"
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+       id="path564-0"
+       style="fill:#000000"
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diff --git a/spectrum_test/spec_to_csv_test_01.csv b/spectrum_test/spec_to_csv_test_01.csv
new file mode 100644
index 0000000000000000000000000000000000000000..66edb602c637bc6cd64090d64df243a60df5a4d0
--- /dev/null
+++ b/spectrum_test/spec_to_csv_test_01.csv
@@ -0,0 +1,6 @@
+500;5.00E+01
+501;4.981E+01
+502;4.982E+01
+503;4.984E+01
+504;4.996E+01
+505;5.010E+01
\ No newline at end of file
diff --git a/spectrum_test/spec_to_csv_test_02.csv b/spectrum_test/spec_to_csv_test_02.csv
new file mode 100644
index 0000000000000000000000000000000000000000..8b137891791fe96927ad78e64b0aad7bded08bdc
--- /dev/null
+++ b/spectrum_test/spec_to_csv_test_02.csv
@@ -0,0 +1 @@
+
diff --git a/spectrum_test/spec_to_csv_test_03.csv b/spectrum_test/spec_to_csv_test_03.csv
new file mode 100644
index 0000000000000000000000000000000000000000..5dbdcbdef1eb68ea811171b2ef7563d75d8781ae
--- /dev/null
+++ b/spectrum_test/spec_to_csv_test_03.csv
@@ -0,0 +1,2 @@
+500;5.010E+01
+501
\ No newline at end of file
diff --git a/spectrum_test/spec_to_csv_test_04.csv b/spectrum_test/spec_to_csv_test_04.csv
new file mode 100644
index 0000000000000000000000000000000000000000..e4170c8734de48740f0944e003c217fd3945fc6c
--- /dev/null
+++ b/spectrum_test/spec_to_csv_test_04.csv
@@ -0,0 +1,2 @@
+500;5.010E+01
+501;ABC
\ No newline at end of file
diff --git a/src/analyzer.rs b/src/analyzer.rs
index fa150ec93b874b62731809f3d2ba56096673be3e..f4447897af65e7f08796f29c18dc1281ed44f757 100644
--- a/src/analyzer.rs
+++ b/src/analyzer.rs
@@ -1,4 +1,5 @@
-use crate::{optic_scenery::OpticScenery, error::OpossumError};
+//! Optical Analyzers
+use crate::{error::OpossumError, optic_scenery::OpticScenery};
 
 type Result<T> = std::result::Result<T, OpossumError>;
 #[derive(Debug)]
@@ -13,10 +14,11 @@ impl AnalyzerEnergy {
         }
     }
     pub fn analyze(&mut self) -> Result<()> {
-       self.scene.analyze(&AnalyzerType::Energy)
+        self.scene.analyze(&AnalyzerType::Energy)
     }
 }
 
 pub enum AnalyzerType {
-    Energy
-}
\ No newline at end of file
+    Energy,
+    ParAxialRayTrace,
+}
diff --git a/src/error.rs b/src/error.rs
index 96112aaeca1efcd32afc773930afeae94d4b54b1..9cc88ac688468eb4fd3b7a59f6e1582d26df3015 100644
--- a/src/error.rs
+++ b/src/error.rs
@@ -1,12 +1,20 @@
+//! Opossum specfic error structures
 use std::{error::Error, fmt::Display};
 
+/// Errors that can be returned by various OPOSSUM functions.
 #[derive(Debug, Clone)]
 pub enum OpossumError {
+    /// error while setting up an `OpticScenery`
     OpticScenery(String),
+    /// error while setting up an `OpticGroup`. The reasons are similar to [`OpossumError::OpticScenery`]
     OpticGroup(String),
+    /// (mostly internal) errors while dealing with optical ports.
     OpticPort(String),
+    /// mostly runtime errors occuring during the analysis of a scenery
     Analysis(String),
+    /// errors while handling optical spectra
     Spectrum(String),
+    /// errors not falling in one of the categories above
     Other(String),
 }
 
diff --git a/src/lib.rs b/src/lib.rs
index ed4f674f15b9b0ac701b381ee6b3629dd78afe0e..d8828a60effdcf9781b5ec07635ac280ad060870 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1,11 +1,12 @@
-//! This is the documentation for the OPOSSUM software package. OPOSSUM stands for OPen-source Optics Simulation Software and Unified Modeller.
-//! 
-/// The basic structure containing the entire optical model
-pub mod optic_scenery;
+//! This is the documentation for the **OPOSSUM** software package. **OPOSSUM** stands for
+//! **Op**en-source **O**ptics **S**imulation **S**oftware and **U**nified **M**odeller.
+//!
+mod light;
+pub mod lightdata;
 /// The basic structure representing an optical element
 pub mod optic_node;
-pub mod light;
-pub mod lightdata;
+/// The basic structure containing the entire optical model
+mod optic_scenery;
 
 pub mod optic_ports;
 
@@ -15,4 +16,6 @@ pub mod analyzer;
 
 pub mod error;
 
-pub mod spectrum;
\ No newline at end of file
+pub mod spectrum;
+
+pub use optic_scenery::OpticScenery;
diff --git a/src/light.rs b/src/light.rs
index c5b35cc9cd2f045449f2ccf0a29e98fb8c9ce9f1..7bc5dc865ba05963d0a9f9686753c84b48c4119e 100644
--- a/src/light.rs
+++ b/src/light.rs
@@ -1,10 +1,15 @@
+//! Data structure for the graph edges.
+//!
+//! [`Light`] represents the information / data flowing from one node to another node. It contains information about
+//! the respective source an target port names this edge connects as well as the actual light information (stored as
+//! [`LightData`]).
 use crate::lightdata::LightData;
 
 #[derive(Debug, Clone)]
 pub struct Light {
     src_port: String,
     target_port: String,
-    data: Option<LightData>
+    data: Option<LightData>,
 }
 
 impl Light {
@@ -12,7 +17,7 @@ impl Light {
         Self {
             src_port: src_port.into(),
             target_port: target_port.into(),
-            data: None
+            data: None,
         }
     }
     pub fn src_port(&self) -> &str {
@@ -21,12 +26,6 @@ impl Light {
     pub fn target_port(&self) -> &str {
         self.target_port.as_ref()
     }
-    pub fn set_src_port(&mut self, src_port: String) {
-        self.src_port = src_port;
-    }
-    pub fn set_target_port(&mut self, target_port: String) {
-        self.target_port = target_port;
-    }
     pub fn data(&self) -> Option<&LightData> {
         self.data.as_ref()
     }
@@ -43,7 +42,7 @@ mod test {
         let light = Light::new("test1", "test2");
         assert_eq!(light.src_port, "test1");
         assert_eq!(light.target_port, "test2");
-        assert_eq!(light.data, None);
+        assert!(light.data.is_none());
     }
     #[test]
     fn src_port() {
@@ -55,16 +54,4 @@ mod test {
         let light = Light::new("test1", "test2");
         assert_eq!(light.target_port(), "test2");
     }
-    #[test]
-    fn set_src_port() {
-        let mut light = Light::new("test1", "test2");
-        light.set_src_port("test3".into());
-        assert_eq!(light.src_port, "test3");
-    }
-    #[test]
-    fn set_target_port() {
-        let mut light = Light::new("test1", "test2");
-        light.set_target_port("test3".into());
-        assert_eq!(light.target_port, "test3");
-    }
 }
diff --git a/src/lightdata.rs b/src/lightdata.rs
index b2ebfa4ad57b89471bc9d25c21c4417a5a9a0fd3..e514311ce6cae225e43d739ec3ec17fe7ee61738 100644
--- a/src/lightdata.rs
+++ b/src/lightdata.rs
@@ -1,32 +1,54 @@
+//! Data structures containing the light information flowing between [`OpticNodes`](crate::optic_node::OpticNode).
 use std::fmt::Display;
-use uom::si::{f64::Energy, energy::joule};
 use uom::fmt::DisplayStyle::Abbreviation;
+use uom::si::{energy::joule, f64::Energy};
 
-#[derive(Debug, PartialEq, Clone)]
+use crate::spectrum::Spectrum;
+
+/// Data structure defining the light properties. The actuals data type used depends on the
+/// [`AnalyzerType`](crate::analyzer::AnalyzerType). For example, an energy analysis ([`LightData::Energy`]) only
+/// contains a [`Spectrum`] information, while a geometric analysis ([`LightData::Geometric]) constains a set of optical
+/// ray data.
+#[derive(Debug, Clone)]
 pub enum LightData {
+    /// data type used for energy analysis.
     Energy(DataEnergy),
+    /// data type used for geometric optics analysis (ray tracing)
     Geometric(DataGeometric),
+    /// placeholder value for future Fourier optics analysis, nothing implementd yet.
     Fourier,
 }
-
+impl LightData {
+    pub fn export(&self, file_name: &str) {
+        match self {
+            LightData::Energy(d) => {
+                d.spectrum.to_plot(file_name);
+            }
+            _ => println!("no export function defined for this type of LightData"),
+        }
+    }
+}
 impl Display for LightData {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match self {
-            
             LightData::Energy(e) => {
                 let ef = Energy::format_args(joule, Abbreviation);
-                write!(f, "Energy: {}", ef.with(e.energy))
-            } ,
+                write!(
+                    f,
+                    "Energy: {}",
+                    ef.with(Energy::new::<joule>(e.spectrum.total_energy()))
+                )
+            }
             _ => write!(f, "No display defined for this type of LightData"),
         }
     }
 }
-#[derive(Debug, PartialEq, Clone)]
+#[derive(Debug, Clone)]
 pub struct DataEnergy {
-    pub energy: Energy,
+    pub spectrum: Spectrum,
 }
 
-#[derive(Debug, PartialEq, Clone)]
+#[derive(Debug, Clone)]
 pub struct DataGeometric {
-    ray: i32,
+    _ray: i32,
 }
diff --git a/src/nodes/node_beam_splitter.rs b/src/nodes/beam_splitter.rs
similarity index 51%
rename from src/nodes/node_beam_splitter.rs
rename to src/nodes/beam_splitter.rs
index a4095aa0601211e938fa67d561e4848d2d385039..d1c6a4b2390a0b8fe51b80f99e0f481fa5bafe1f 100644
--- a/src/nodes/node_beam_splitter.rs
+++ b/src/nodes/beam_splitter.rs
@@ -1,18 +1,26 @@
 use std::collections::HashMap;
-use uom::{si::f64::Energy, num_traits::Zero};
 
 use crate::{
     analyzer::AnalyzerType,
     error::OpossumError,
-    lightdata::{LightData, DataEnergy},
+    lightdata::{DataEnergy, LightData},
     optic_node::{Dottable, LightResult, Optical},
     optic_ports::OpticPorts,
+    spectrum::{merge_spectra, Spectrum},
 };
 
 type Result<T> = std::result::Result<T, OpossumError>;
 
 #[derive(Debug)]
 /// An ideal beamsplitter node with a given splitting ratio.
+///
+/// ## Optical Ports
+///   - Inputs
+///     - `input1`
+///     - `input2`
+///   - Outputs
+///     - `out1_trans1_refl2`
+///     - `out2_trans2_refl1`
 pub struct BeamSplitter {
     ratio: f64,
 }
@@ -36,30 +44,54 @@ impl BeamSplitter {
         let in1 = incoming_data.get("input1");
         let in2 = incoming_data.get("input2");
 
-        let mut in1_energy = Energy::zero();
-        let mut in2_energy = Energy::zero();
+        let mut out1_1_spectrum: Option<Spectrum> = None;
+        let mut out1_2_spectrum: Option<Spectrum> = None;
+        let mut out2_1_spectrum: Option<Spectrum> = None;
+        let mut out2_2_spectrum: Option<Spectrum> = None;
 
         if let Some(Some(in1)) = in1 {
             match in1 {
-                LightData::Energy(e) => in1_energy = e.energy,
-                _ => return Err(OpossumError::Analysis("expected energy value".into())),
+                LightData::Energy(e) => {
+                    let mut s = e.spectrum.clone();
+                    s.scale_vertical(self.ratio).unwrap();
+                    out1_1_spectrum = Some(s);
+                    let mut s = e.spectrum.clone();
+                    s.scale_vertical(1.0 - self.ratio).unwrap();
+                    out1_2_spectrum = Some(s);
+                }
+                _ => return Err(OpossumError::Analysis("expected DataEnergy value".into())),
             }
         }
         if let Some(Some(in2)) = in2 {
             match in2 {
-                LightData::Energy(e) => in2_energy = e.energy,
-                _ => return Err(OpossumError::Analysis("expected energy value".into())),
+                LightData::Energy(e) => {
+                    let mut s = e.spectrum.clone();
+                    s.scale_vertical(self.ratio).unwrap();
+                    out2_1_spectrum = Some(s);
+                    let mut s = e.spectrum.clone();
+                    s.scale_vertical(1.0 - self.ratio).unwrap();
+                    out2_2_spectrum = Some(s);
+                }
+                _ => return Err(OpossumError::Analysis("expected DataEnergy value".into())),
             }
         }
-        let out1_energy = Some(LightData::Energy(DataEnergy {
-            energy: in1_energy * self.ratio + in2_energy * (1.0 - self.ratio),
-        }));
-        let out2_energy = Some(LightData::Energy(DataEnergy {
-            energy: in1_energy * (1.0 - self.ratio) + in2_energy * self.ratio,
-        }));
+        let out1_spec = merge_spectra(out1_1_spectrum, out2_2_spectrum);
+        let out2_spec = merge_spectra(out1_2_spectrum, out2_1_spectrum);
+        let mut out1_data: Option<LightData> = None;
+        let mut out2_data: Option<LightData> = None;
+        if let Some(out1_spec) = out1_spec {
+            out1_data = Some(LightData::Energy(DataEnergy {
+                spectrum: out1_spec,
+            }))
+        }
+        if let Some(out2_spec) = out2_spec {
+            out2_data = Some(LightData::Energy(DataEnergy {
+                spectrum: out2_spec,
+            }))
+        }
         Ok(HashMap::from([
-            ("out1_trans1_refl2".into(), out1_energy),
-            ("out2_trans2_refl1".into(), out2_energy),
+            ("out1_trans1_refl2".into(), out1_data),
+            ("out2_trans2_refl1".into(), out2_data),
         ]))
     }
 }
@@ -90,6 +122,9 @@ impl Optical for BeamSplitter {
     ) -> Result<LightResult> {
         match analyzer_type {
             AnalyzerType::Energy => self.analyze_energy(incoming_data),
+            _ => Err(OpossumError::Analysis(
+                "analysis type not yet implemented".into(),
+            )),
         }
     }
 }
diff --git a/src/nodes/node_detector.rs b/src/nodes/detector.rs
similarity index 73%
rename from src/nodes/node_detector.rs
rename to src/nodes/detector.rs
index 7235b959c9ef531f187ef6f82752172482281447..96878ce328ea9eb739e14db1633bb5460089f0f9 100644
--- a/src/nodes/node_detector.rs
+++ b/src/nodes/detector.rs
@@ -9,11 +9,18 @@ use std::fmt::Debug;
 type Result<T> = std::result::Result<T, OpossumError>;
 
 #[derive(Default)]
-/// This node rerpresents an universal detector. Any [`LightData`] coming in will be stored internally for later display / export. So far it only has one input (in1).
+/// This node represents an universal detector.
+///
+/// Any [`LightData`] coming in will be stored internally for later display / export. So far it only has one input (in1).
+///
+/// ## Optical Ports
+///   - Inputs
+///     - `in1`
+///   - Outputs
+///     - none
 pub struct Detector {
     light_data: Option<LightData>,
 }
-
 impl Optical for Detector {
     fn node_type(&self) -> &str {
         "light sink: detector"
@@ -37,12 +44,17 @@ impl Optical for Detector {
         }
         Ok(LightResult::default())
     }
+    fn export_data(&self, file_name: &str) {
+        if let Some(data) = &self.light_data {
+            data.export(file_name)
+        }
+    }
 }
 
 impl Debug for Detector {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match &self.light_data {
-            Some(data) => write!(f,"{}",data),
+            Some(data) => write!(f, "{}", data),
             None => write!(f, "no data"),
         }
     }
diff --git a/src/nodes/dummy.rs b/src/nodes/dummy.rs
new file mode 100644
index 0000000000000000000000000000000000000000..ef52210dc30c6f1236a2422752d3379342764b5e
--- /dev/null
+++ b/src/nodes/dummy.rs
@@ -0,0 +1,48 @@
+use std::collections::HashMap;
+
+use crate::analyzer::AnalyzerType;
+use crate::error::OpossumError;
+use crate::optic_node::{Dottable, LightResult, Optical};
+use crate::optic_ports::OpticPorts;
+
+type Result<T> = std::result::Result<T, OpossumError>;
+
+#[derive(Debug)]
+/// A fake / dummy component without any optical functionality.
+///
+/// Any [`LightResult`] is directly forwarded without any modification. It is mainly used for
+/// development and debugging purposes.
+///
+/// ## Optical Ports
+///   - Inputs
+///     - `front`
+///   - Outputs
+///     - `rear`
+pub struct Dummy;
+
+impl Optical for Dummy {
+    /// Returns "dummy" as node type.
+    fn node_type(&self) -> &str {
+        "dummy"
+    }
+    fn ports(&self) -> OpticPorts {
+        let mut ports = OpticPorts::new();
+        ports.add_input("front").unwrap();
+        ports.add_output("rear").unwrap();
+        ports
+    }
+
+    fn analyze(
+        &mut self,
+        incoming_data: LightResult,
+        _analyzer_type: &AnalyzerType,
+    ) -> Result<LightResult> {
+        if let Some(data) = incoming_data.get("front") {
+            Ok(HashMap::from([("rear".into(), data.clone())]))
+        } else {
+            Ok(HashMap::from([("rear".into(), None)]))
+        }
+    }
+}
+
+impl Dottable for Dummy {}
diff --git a/src/nodes/group.rs b/src/nodes/group.rs
new file mode 100644
index 0000000000000000000000000000000000000000..02e7777ffc9b0d39b2f6204f72806cce61af0d3f
--- /dev/null
+++ b/src/nodes/group.rs
@@ -0,0 +1,616 @@
+#![warn(missing_docs)]
+use crate::analyzer::AnalyzerType;
+use crate::error::OpossumError;
+use crate::light::Light;
+use crate::lightdata::LightData;
+use crate::optic_node::{Dottable, LightResult};
+use crate::{
+    optic_node::{OpticNode, Optical},
+    optic_ports::OpticPorts,
+};
+use petgraph::prelude::{DiGraph, EdgeIndex, NodeIndex};
+use petgraph::visit::EdgeRef;
+use petgraph::{algo::*, Direction};
+use std::cell::RefCell;
+use std::collections::HashMap;
+use std::rc::Rc;
+
+type Result<T> = std::result::Result<T, OpossumError>;
+
+#[derive(Default, Debug, Clone)]
+/// A node that represents a group of other [`OpticNode`]s arranges in a subgraph.
+///
+/// All unconnected input and output ports of this subgraph could be used as ports of
+/// this [`NodeGroup`]. For this, port mapping is neccessary (see below).
+///
+/// ## Optical Ports
+///   - Inputs
+///     - defined by [`map_input_port`](NodeGroup::map_input_port()) function.
+///   - Outputs
+///     - defined by [`map_output_port`](NodeGroup::map_output_port()) function.
+pub struct NodeGroup {
+    g: DiGraph<Rc<RefCell<OpticNode>>, Light>,
+    input_port_map: HashMap<String, (NodeIndex, String)>,
+    output_port_map: HashMap<String, (NodeIndex, String)>,
+}
+
+impl NodeGroup {
+    /// Creates a new (empty) [`NodeGroup`].
+    pub fn new() -> Self {
+        Self::default()
+    }
+    /// Add a given [`OpticNode`] to the (sub-)graph of this [`NodeGroup`].
+    ///
+    /// This command just adds an [`OpticNode`] but does not connect it to existing nodes in the (sub-)graph. The given node is
+    /// consumed (owned) by the [`NodeGroup`].
+    pub fn add_node(&mut self, node: OpticNode) -> NodeIndex {
+        self.g.add_node(Rc::new(RefCell::new(node)))
+    }
+    /// Connect (already existing) nodes denoted by the respective `NodeIndex`.
+    ///
+    /// Both node indices must exist. Otherwise an [`OpossumError::OpticScenery`] is returned. In addition, connections are
+    /// rejected and an [`OpossumError::OpticScenery`] is returned, if the graph would form a cycle (loop in the graph). **Note**:
+    /// The connection of two internal nodes might affect external port mappings (see [`map_input_port`](NodeGroup::map_input_port())
+    /// & [`map_output_port`](NodeGroup::map_output_port()) functions). In this case no longer valid mappings will be deleted.
+    pub fn connect_nodes(
+        &mut self,
+        src_node: NodeIndex,
+        src_port: &str,
+        target_node: NodeIndex,
+        target_port: &str,
+    ) -> Result<EdgeIndex> {
+        if let Some(source) = self.g.node_weight(src_node) {
+            if !source.borrow().ports().outputs().contains(&src_port.into()) {
+                return Err(OpossumError::OpticScenery(format!(
+                    "source node {} does not have a port {}",
+                    source.borrow().name(),
+                    src_port
+                )));
+            }
+        } else {
+            return Err(OpossumError::OpticScenery(
+                "source node with given index does not exist".into(),
+            ));
+        }
+        if let Some(target) = self.g.node_weight(target_node) {
+            if !target
+                .borrow()
+                .ports()
+                .inputs()
+                .contains(&target_port.into())
+            {
+                return Err(OpossumError::OpticScenery(format!(
+                    "target node {} does not have a port {}",
+                    target.borrow().name(),
+                    target_port
+                )));
+            }
+        } else {
+            return Err(OpossumError::OpticScenery(
+                "target node with given index does not exist".into(),
+            ));
+        }
+        if self.src_node_port_exists(src_node, src_port) {
+            return Err(OpossumError::OpticScenery(format!(
+                "src node with given port {} is already connected",
+                src_port
+            )));
+        }
+        if self.target_node_port_exists(src_node, src_port) {
+            return Err(OpossumError::OpticScenery(format!(
+                "target node with given port {} is already connected",
+                target_port
+            )));
+        }
+        let edge_index = self
+            .g
+            .add_edge(src_node, target_node, Light::new(src_port, target_port));
+        if is_cyclic_directed(&self.g) {
+            self.g.remove_edge(edge_index);
+            return Err(OpossumError::OpticScenery(
+                "connecting the given nodes would form a loop".into(),
+            ));
+        }
+        let in_map = self.input_port_map.clone();
+        let invalid_mapping = in_map
+            .iter()
+            .find(|m| m.1 .0 == target_node && m.1 .1 == target_port);
+        if let Some(input) = invalid_mapping {
+            self.input_port_map.remove(input.0);
+        }
+        let out_map = self.output_port_map.clone();
+        let invalid_mapping = out_map
+            .iter()
+            .find(|m| m.1 .0 == src_node && m.1 .1 == src_port);
+        if let Some(input) = invalid_mapping {
+            self.output_port_map.remove(input.0);
+        }
+        Ok(edge_index)
+    }
+    fn src_node_port_exists(&self, src_node: NodeIndex, src_port: &str) -> bool {
+        self.g
+            .edges_directed(src_node, petgraph::Direction::Outgoing)
+            .any(|e| e.weight().src_port() == src_port)
+    }
+    fn target_node_port_exists(&self, target_node: NodeIndex, target_port: &str) -> bool {
+        self.g
+            .edges_directed(target_node, petgraph::Direction::Incoming)
+            .any(|e| e.weight().target_port() == target_port)
+    }
+    fn input_nodes(&self) -> Vec<NodeIndex> {
+        let mut input_nodes: Vec<NodeIndex> = Vec::default();
+        for node_idx in self.g.node_indices() {
+            let incoming_edges = self.g.edges_directed(node_idx, Direction::Incoming).count();
+            let input_ports = self
+                .g
+                .node_weight(node_idx)
+                .unwrap()
+                .borrow()
+                .ports()
+                .inputs()
+                .len();
+            if input_ports != incoming_edges {
+                input_nodes.push(node_idx);
+            }
+        }
+        input_nodes
+    }
+    fn output_nodes(&self) -> Vec<NodeIndex> {
+        let mut output_nodes: Vec<NodeIndex> = Vec::default();
+        for node_idx in self.g.node_indices() {
+            let outgoing_edges = self.g.edges_directed(node_idx, Direction::Outgoing).count();
+            let output_ports = self
+                .g
+                .node_weight(node_idx)
+                .unwrap()
+                .borrow()
+                .ports()
+                .outputs()
+                .len();
+            if output_ports != outgoing_edges {
+                output_nodes.push(node_idx);
+            }
+        }
+        output_nodes
+    }
+    /// Map an input port of an internal node to an external port of the group.
+    ///
+    /// In oder to use a [`NodeGroup`] from the outside, internal nodes / ports must be mapped to be visible. The
+    /// corresponding [`ports`](NodeGroup::ports()) function only returns ports that have been mapped before.
+    /// # Errors
+    ///
+    /// This function will return an error if
+    ///   - an external input port name has already been assigned.
+    ///   - the `input_node` / `internal_name` does not exist.
+    ///   - the specified `input_node` is not an input node of the group (i.e. fully connected to other internal nodes).
+    ///   - the `input_node` has an input port with the specified `internal_name` but is already internally connected.
+    pub fn map_input_port(
+        &mut self,
+        input_node: NodeIndex,
+        internal_name: &str,
+        external_name: &str,
+    ) -> Result<()> {
+        if self.input_port_map.contains_key(external_name) {
+            return Err(OpossumError::OpticGroup(
+                "external input port name already assigned".into(),
+            ));
+        }
+        if let Some(node) = self.g.node_weight(input_node) {
+            if !node
+                .borrow()
+                .ports()
+                .inputs()
+                .contains(&(internal_name.to_string()))
+            {
+                return Err(OpossumError::OpticGroup(
+                    "internal input port name not found".into(),
+                ));
+            }
+        } else {
+            return Err(OpossumError::OpticGroup(
+                "internal node index not found".into(),
+            ));
+        }
+        if !self.input_nodes().contains(&input_node) {
+            return Err(OpossumError::OpticGroup(
+                "node to be mapped is not an input node of the group".into(),
+            ));
+        }
+        let incoming_edge_connected = self
+            .g
+            .edges_directed(input_node, Direction::Incoming)
+            .map(|e| e.weight().target_port())
+            .any(|p| p == internal_name);
+        if incoming_edge_connected {
+            return Err(OpossumError::OpticGroup(
+                "port of input node is already internally connected".into(),
+            ));
+        }
+        self.input_port_map.insert(
+            external_name.to_string(),
+            (input_node, internal_name.to_string()),
+        );
+        Ok(())
+    }
+    /// Map an output port of an internal node to an external port of the group.
+    ///
+    /// In oder to use a [`NodeGroup`] from the outside, internal nodes / ports must be mapped to be visible. The
+    /// corresponding [`ports`](NodeGroup::ports()) function only returns ports that have been mapped before.
+    /// # Errors
+    ///
+    /// This function will return an error if
+    ///   - an external output port name has already been assigned.
+    ///   - the `output_node` / `internal_name` does not exist.
+    ///   - the specified `output_node` is not an output node of the group (i.e. fully connected to other internal nodes).
+    ///   - the `output_node` has an output port with the specified `internal_name` but is already internally connected.
+    pub fn map_output_port(
+        &mut self,
+        output_node: NodeIndex,
+        internal_name: &str,
+        external_name: &str,
+    ) -> Result<()> {
+        if self.output_port_map.contains_key(external_name) {
+            return Err(OpossumError::OpticGroup(
+                "external output port name already assigned".into(),
+            ));
+        }
+        if let Some(node) = self.g.node_weight(output_node) {
+            if !node
+                .borrow()
+                .ports()
+                .outputs()
+                .contains(&(internal_name.to_string()))
+            {
+                return Err(OpossumError::OpticGroup(
+                    "internal output port name not found".into(),
+                ));
+            }
+        } else {
+            return Err(OpossumError::OpticGroup(
+                "internal node index not found".into(),
+            ));
+        }
+        if !self.output_nodes().contains(&output_node) {
+            return Err(OpossumError::OpticGroup(
+                "node to be mapped is not an output node of the group".into(),
+            ));
+        }
+        let outgoing_edge_connected = self
+            .g
+            .edges_directed(output_node, Direction::Outgoing)
+            .map(|e| e.weight().src_port())
+            .any(|p| p == internal_name);
+        if outgoing_edge_connected {
+            return Err(OpossumError::OpticGroup(
+                "port of output node is already internally connected".into(),
+            ));
+        }
+        self.output_port_map.insert(
+            external_name.to_string(),
+            (output_node, internal_name.to_string()),
+        );
+        Ok(())
+    }
+    fn incoming_edges(&self, idx: NodeIndex) -> LightResult {
+        let edges = self.g.edges_directed(idx, Direction::Incoming);
+        edges
+            .into_iter()
+            .map(|e| {
+                (
+                    e.weight().target_port().to_owned(),
+                    e.weight().data().cloned(),
+                )
+            })
+            .collect::<HashMap<String, Option<LightData>>>()
+    }
+    fn set_outgoing_edge_data(&mut self, idx: NodeIndex, port: String, data: Option<LightData>) {
+        let edges = self.g.edges_directed(idx, Direction::Outgoing);
+        let edge_ref = edges
+            .into_iter()
+            .filter(|idx| idx.weight().src_port() == port)
+            .last();
+        if let Some(edge_ref) = edge_ref {
+            let edge_idx = edge_ref.id();
+            let light = self.g.edge_weight_mut(edge_idx);
+            if let Some(light) = light {
+                light.set_data(data);
+            }
+        } // else outgoing edge not connected -> data dropped
+    }
+    fn analyze_group(
+        &mut self,
+        incoming_data: LightResult,
+        analyzer_type: &AnalyzerType,
+    ) -> Result<LightResult> {
+        let g_clone = self.g.clone();
+        let mut group_srcs = g_clone.externals(Direction::Incoming);
+        let mut light_result = LightResult::default();
+        let sorted = toposort(&self.g, None).unwrap();
+        for idx in sorted {
+            // Check if node is group src node
+            let incoming_edges = if group_srcs.any(|gs| gs == idx) {
+                // get from incoming_data
+                let assigned_ports = self.input_port_map.iter().filter(|p| p.1 .0 == idx);
+                let mut incoming = LightResult::default();
+                for port in assigned_ports {
+                    incoming.insert(
+                        port.1 .1.to_owned(),
+                        incoming_data.get(port.0).unwrap().clone(),
+                    );
+                }
+                incoming
+            } else {
+                self.incoming_edges(idx)
+            };
+            let node = self.g.node_weight(idx).unwrap();
+            let outgoing_edges = node.borrow_mut().analyze(incoming_edges, analyzer_type)?;
+            let mut group_sinks = self.g.externals(Direction::Outgoing);
+            // Check if node is group sink node
+            if group_sinks.any(|gs| gs == idx) {
+                let assigned_ports = self.output_port_map.iter().filter(|p| p.1 .0 == idx);
+                for port in assigned_ports {
+                    light_result.insert(
+                        port.0.to_owned(),
+                        outgoing_edges.get(&port.1 .1).unwrap().clone(),
+                    );
+                }
+            } else {
+                for outgoing_edge in outgoing_edges {
+                    self.set_outgoing_edge_data(idx, outgoing_edge.0, outgoing_edge.1)
+                }
+            }
+        }
+        Ok(light_result)
+    }
+}
+
+impl Optical for NodeGroup {
+    fn node_type(&self) -> &str {
+        "group"
+    }
+    fn ports(&self) -> OpticPorts {
+        let mut ports = OpticPorts::new();
+        for p in self.input_port_map.iter() {
+            ports.add_input(p.0).unwrap();
+        }
+        for p in self.output_port_map.iter() {
+            ports.add_output(p.0).unwrap();
+        }
+        ports
+    }
+    fn analyze(
+        &mut self,
+        incoming_data: LightResult,
+        analyzer_type: &AnalyzerType,
+    ) -> Result<LightResult> {
+        self.analyze_group(incoming_data, analyzer_type)
+    }
+}
+
+impl Dottable for NodeGroup {
+    fn to_dot(&self, node_index: &str, name: &str, inverted: bool, _ports: &OpticPorts) -> String {
+        let inv_string = if inverted { "(inv)" } else { "" };
+        let mut dot_string = format!(
+            "  subgraph i{} {{\n\tlabel=\"{}{}\"\n\tfontsize=15\n\tcluster=true\n\t",
+            node_index, name, inv_string
+        );
+        for node_idx in self.g.node_indices() {
+            let node = self.g.node_weight(node_idx).unwrap();
+            dot_string += &node
+                .borrow()
+                .to_dot(&format!("{}_i{}", node_index, node_idx.index()));
+        }
+        for edge in self.g.edge_indices() {
+            let end_nodes = self.g.edge_endpoints(edge).unwrap();
+            let light = self.g.edge_weight(edge).unwrap();
+            dot_string.push_str(&format!(
+                "      i{}_i{}:{} -> i{}_i{}:{}\n",
+                node_index,
+                end_nodes.0.index(),
+                light.src_port(),
+                node_index,
+                end_nodes.1.index(),
+                light.target_port()
+            ));
+        }
+        dot_string += "}";
+        dot_string
+    }
+
+    fn node_color(&self) -> &str {
+        "yellow"
+    }
+}
+
+#[cfg(test)]
+mod test {
+    use super::NodeGroup;
+    use crate::{
+        nodes::{BeamSplitter, Dummy},
+        optic_node::{OpticNode, Optical},
+    };
+    #[test]
+    fn new() {
+        let og = NodeGroup::new();
+        assert_eq!(og.g.node_count(), 0);
+        assert_eq!(og.g.edge_count(), 0);
+        assert!(og.input_port_map.is_empty());
+        assert!(og.output_port_map.is_empty());
+    }
+    #[test]
+    fn add_node() {
+        let mut og = NodeGroup::new();
+        let sub_node = OpticNode::new("test", Dummy);
+        og.add_node(sub_node);
+        assert_eq!(og.g.node_count(), 1);
+    }
+    #[test]
+    fn connect_nodes() {
+        let mut og = NodeGroup::new();
+        let sub_node1 = OpticNode::new("test1", Dummy);
+        let sn1_i = og.add_node(sub_node1);
+        let sub_node2 = OpticNode::new("test2", Dummy);
+        let sn2_i = og.add_node(sub_node2);
+        // wrong port names
+        assert!(og.connect_nodes(sn1_i, "wrong", sn2_i, "front").is_err());
+        assert_eq!(og.g.edge_count(), 0);
+        assert!(og.connect_nodes(sn1_i, "rear", sn2_i, "wrong").is_err());
+        assert_eq!(og.g.edge_count(), 0);
+        // wrong node index
+        assert!(og.connect_nodes(5.into(), "rear", sn2_i, "front").is_err());
+        assert_eq!(og.g.edge_count(), 0);
+        assert!(og.connect_nodes(sn1_i, "rear", 5.into(), "front").is_err());
+        assert_eq!(og.g.edge_count(), 0);
+        // correct usage
+        assert!(og.connect_nodes(sn1_i, "rear", sn2_i, "front").is_ok());
+        assert_eq!(og.g.edge_count(), 1);
+    }
+    #[test]
+    fn connect_nodes_update_port_mapping() {
+        let mut og = NodeGroup::new();
+        let sub_node1 = OpticNode::new("test1", Dummy);
+        let sn1_i = og.add_node(sub_node1);
+        let sub_node2 = OpticNode::new("test2", Dummy);
+        let sn2_i = og.add_node(sub_node2);
+
+        og.map_input_port(sn2_i, "front", "input").unwrap();
+        og.map_output_port(sn1_i, "rear", "output").unwrap();
+        assert_eq!(og.input_port_map.len(), 1);
+        assert_eq!(og.output_port_map.len(), 1);
+        og.connect_nodes(sn1_i, "rear", sn2_i, "front").unwrap();
+        // delete no longer valid port mapping
+        assert_eq!(og.input_port_map.len(), 0);
+        assert_eq!(og.output_port_map.len(), 0);
+    }
+    #[test]
+    fn input_nodes() {
+        let mut og = NodeGroup::new();
+        let sub_node1 = OpticNode::new("test1", Dummy);
+        let sn1_i = og.add_node(sub_node1);
+        let sub_node1 = OpticNode::new("test2", Dummy);
+        let sn2_i = og.add_node(sub_node1);
+        let sub_node3 = OpticNode::new("test3", BeamSplitter::new(0.5));
+        let sn3_i = og.add_node(sub_node3);
+        og.connect_nodes(sn1_i, "rear", sn2_i, "front").unwrap();
+        og.connect_nodes(sn2_i, "rear", sn3_i, "input1").unwrap();
+        assert_eq!(og.input_nodes(), vec![0.into(), 2.into()])
+    }
+    #[test]
+    fn output_nodes() {
+        let mut og = NodeGroup::new();
+        let sub_node1 = OpticNode::new("test1", Dummy);
+        let sn1_i = og.add_node(sub_node1);
+        let sub_node1 = OpticNode::new("test2", BeamSplitter::new(0.5));
+        let sn2_i = og.add_node(sub_node1);
+        let sub_node3 = OpticNode::new("test3", Dummy);
+        let sn3_i = og.add_node(sub_node3);
+        og.connect_nodes(sn1_i, "rear", sn2_i, "input1").unwrap();
+        og.connect_nodes(sn2_i, "out1_trans1_refl2", sn3_i, "front")
+            .unwrap();
+        assert_eq!(og.input_nodes(), vec![0.into(), 1.into()])
+    }
+    #[test]
+    fn map_input_port() {
+        let mut og = NodeGroup::new();
+        let sub_node1 = OpticNode::new("test1", Dummy);
+        let sn1_i = og.add_node(sub_node1);
+        let sub_node2 = OpticNode::new("test2", Dummy);
+        let sn2_i = og.add_node(sub_node2);
+        og.connect_nodes(sn1_i, "rear", sn2_i, "front").unwrap();
+
+        // wrong port name
+        assert!(og.map_input_port(sn1_i, "wrong", "input").is_err());
+        assert!(og.input_port_map.is_empty());
+        // wrong node index
+        assert!(og.map_input_port(5.into(), "front", "input").is_err());
+        assert!(og.input_port_map.is_empty());
+        // map output port
+        assert!(og.map_input_port(sn2_i, "rear", "input").is_err());
+        assert!(og.input_port_map.is_empty());
+        // map internal node
+        assert!(og.map_input_port(sn2_i, "front", "input").is_err());
+        assert!(og.input_port_map.is_empty());
+        // correct usage
+        assert!(og.map_input_port(sn1_i, "front", "input").is_ok());
+        assert_eq!(og.input_port_map.len(), 1);
+    }
+    #[test]
+    fn map_input_port_half_connected_nodes() {
+        let mut og = NodeGroup::new();
+        let sub_node1 = OpticNode::new("test1", Dummy);
+        let sn1_i = og.add_node(sub_node1);
+        let sub_node2 = OpticNode::new("test2", BeamSplitter::default());
+        let sn2_i = og.add_node(sub_node2);
+        og.connect_nodes(sn1_i, "rear", sn2_i, "input1").unwrap();
+
+        // node port already internally connected
+        assert!(og.map_input_port(sn2_i, "input1", "bs_input").is_err());
+
+        // correct usage
+        assert!(og.map_input_port(sn1_i, "front", "input").is_ok());
+        assert!(og.map_input_port(sn2_i, "input2", "bs_input").is_ok());
+        assert_eq!(og.input_port_map.len(), 2);
+    }
+    #[test]
+    fn map_output_port() {
+        let mut og = NodeGroup::new();
+        let sub_node1 = OpticNode::new("test1", Dummy);
+        let sn1_i = og.add_node(sub_node1);
+        let sub_node2 = OpticNode::new("test2", Dummy);
+        let sn2_i = og.add_node(sub_node2);
+        og.connect_nodes(sn1_i, "rear", sn2_i, "front").unwrap();
+
+        // wrong port name
+        assert!(og.map_output_port(sn2_i, "wrong", "output").is_err());
+        assert!(og.output_port_map.is_empty());
+        // wrong node index
+        assert!(og.map_output_port(5.into(), "rear", "output").is_err());
+        assert!(og.output_port_map.is_empty());
+        // map input port
+        assert!(og.map_output_port(sn1_i, "front", "output").is_err());
+        assert!(og.output_port_map.is_empty());
+        // map internal node
+        assert!(og.map_output_port(sn1_i, "rear", "output").is_err());
+        assert!(og.output_port_map.is_empty());
+        // correct usage
+        assert!(og.map_output_port(sn2_i, "rear", "output").is_ok());
+        assert_eq!(og.output_port_map.len(), 1);
+    }
+    #[test]
+    fn map_output_port_half_connected_nodes() {
+        let mut og = NodeGroup::new();
+        let sub_node1 = OpticNode::new("test1", BeamSplitter::default());
+        let sn1_i = og.add_node(sub_node1);
+        let sub_node2 = OpticNode::new("test2", Dummy);
+        let sn2_i = og.add_node(sub_node2);
+        og.connect_nodes(sn1_i, "out1_trans1_refl2", sn2_i, "front")
+            .unwrap();
+
+        // node port already internally connected
+        assert!(og
+            .map_output_port(sn1_i, "out1_trans1_refl2", "bs_output")
+            .is_err());
+
+        // correct usage
+        assert!(og
+            .map_output_port(sn1_i, "out2_trans2_refl1", "bs_output")
+            .is_ok());
+        assert!(og.map_output_port(sn2_i, "rear", "output").is_ok());
+        assert_eq!(og.output_port_map.len(), 2);
+    }
+    #[test]
+    fn ports() {
+        let mut og = NodeGroup::new();
+        let sub_node1 = OpticNode::new("test1", Dummy);
+        let sn1_i = og.add_node(sub_node1);
+        let sub_node2 = OpticNode::new("test2", Dummy);
+        let sn2_i = og.add_node(sub_node2);
+        og.connect_nodes(sn1_i, "rear", sn2_i, "front").unwrap();
+        assert!(og.ports().inputs().is_empty());
+        assert!(og.ports().outputs().is_empty());
+        og.map_input_port(sn1_i, "front", "input").unwrap();
+        assert!(og.ports().inputs().contains(&("input".to_string())));
+        og.map_output_port(sn2_i, "rear", "output").unwrap();
+        assert!(og.ports().outputs().contains(&("output".to_string())));
+    }
+}
diff --git a/src/nodes/ideal_filter.rs b/src/nodes/ideal_filter.rs
index e7378cf550b72179226a6fabcf1e129a328e45ac..8d68c8d0db4c57b4fc160e4b25b5abaa9dd31fb6 100644
--- a/src/nodes/ideal_filter.rs
+++ b/src/nodes/ideal_filter.rs
@@ -1,87 +1,123 @@
 use crate::analyzer::AnalyzerType;
 use crate::error::OpossumError;
-use crate::lightdata::{LightData, DataEnergy};
+use crate::lightdata::{DataEnergy, LightData};
 use crate::optic_node::{Dottable, LightResult, Optical};
 use crate::optic_ports::OpticPorts;
+use crate::spectrum::Spectrum;
 use std::collections::HashMap;
-use uom::num_traits::Zero;
-use uom::si::f64::Energy;
 
 type Result<T> = std::result::Result<T, OpossumError>;
 
+/// Config data for an [`IdealFilter`].
+#[derive(Debug, Clone)]
+pub enum FilterType {
+    /// a fixed (wavelength-independant) transmission value. Must be between 0.0 and 1.0
+    Constant(f64),
+    /// filter based on given transmission spectrum.
+    Spectrum(Spectrum),
+}
 #[derive(Debug)]
 /// An ideal filter with given transmission or optical density.
+///
+/// ## Optical Ports
+///   - Inputs
+///     - `front`
+///   - Outputs
+///     - `rear`
 pub struct IdealFilter {
-    transmission: f64
+    filter_type: FilterType,
 }
 
 impl IdealFilter {
-    /// Creates a new [`IdealFilter`] with a given energy transmission factor.
+    /// Creates a new [`IdealFilter`] with a given [`FilterType`].
     ///
     /// # Errors
     ///
-    /// This function will return an error if a transmission factor > 1.0 is given (This would be an amplifiying filter :-) ).
-    pub fn new(transmission: f64) -> Result<Self> {
-        if transmission <= 1.0 {
-            Ok(Self { transmission })
-        } else {
-            Err(OpossumError::Other("attenuation must be <= 1.0".into()))
+    /// This function will return an [`OpossumError::Other`] if the filter type is
+    /// [`FilterType::Constant`] and the transmission factor is outside the interval [0.0; 1.0].
+    pub fn new(filter_type: FilterType) -> Result<Self> {
+        if let FilterType::Constant(transmission) = filter_type {
+            if !(0.0..=1.0).contains(&transmission) {
+                return Err(OpossumError::Other(
+                    "attenuation must be in interval [0.0; 1.0]".into(),
+                ));
+            }
         }
+        Ok(Self { filter_type })
     }
-    /// Returns the transmission factor of this [`IdealFilter`].
-    pub fn transmission(&self) -> f64 {
-        self.transmission
+    /// Returns the filter type of this [`IdealFilter`].
+    pub fn filter_type(&self) -> FilterType {
+        self.filter_type.clone()
     }
-    /// Sets the transmission of this [`IdealFilter`].
+    /// Sets a constant transmission value for this [`IdealFilter`].
     ///
+    /// This implicitly sets the filter type to [`FilterType::Constant`].
     /// # Errors
     ///
     /// This function will return an error if a transmission factor > 1.0 is given (This would be an amplifiying filter :-) ).
     pub fn set_transmission(&mut self, transmission: f64) -> Result<()> {
-        if transmission <= 1.0 {
-            self.transmission = transmission;
+        if (0.0..=1.0).contains(&transmission) {
+            self.filter_type = FilterType::Constant(transmission);
             Ok(())
         } else {
-            Err(OpossumError::Other("attenuation must be <=1.0".into()))
+            Err(OpossumError::Other(
+                "attenuation must be in interval [0.0; 1.0]".into(),
+            ))
         }
     }
     /// Sets the transmission of this [`IdealFilter`] expressed as optical density.
     ///
+    /// This implicitly sets the filter type to [`FilterType::Constant`].
     /// # Errors
     ///
     /// This function will return an error if an optical density < 0.0 was given.
     pub fn set_optical_density(&mut self, density: f64) -> Result<()> {
         if density >= 0.0 {
-            self.transmission = f64::powf(10.0, -1.0 * density);
+            self.filter_type = FilterType::Constant(f64::powf(10.0, -1.0 * density));
             Ok(())
         } else {
             Err(OpossumError::Other("optical densitiy must be >=0".into()))
         }
     }
-    /// Returns the transmission facotr of this [`IdealFilter`] expressed as optical density.
-    pub fn optical_density(&self) -> f64 {
-        -1.0 * f64::log10(self.transmission)
+    /// Returns the transmission factor of this [`IdealFilter`] expressed as optical density for the [`FilterType::Constant`].
+    ///
+    /// This functions `None` if the filter type is not [`FilterType::Constant`].
+    pub fn optical_density(&self) -> Option<f64> {
+        match self.filter_type {
+            FilterType::Constant(t) => Some(-1.0 * f64::log10(t)),
+            _ => None,
+        }
     }
     fn analyze_energy(&mut self, incoming_data: LightResult) -> Result<LightResult> {
         let input = incoming_data.get("front");
-
-        let mut input_energy = Energy::zero();
-
         if let Some(Some(input)) = input {
             match input {
-                LightData::Energy(e) => input_energy = e.energy,
+                LightData::Energy(e) => {
+                    let mut out_spec = e.spectrum.clone();
+                    match &self.filter_type {
+                        FilterType::Constant(t) => {
+                            if out_spec.scale_vertical(*t).is_ok() {
+                                let light_data =
+                                    Some(LightData::Energy(DataEnergy { spectrum: out_spec }));
+                                return Ok(HashMap::from([("rear".into(), light_data)]));
+                            }
+                        }
+                        FilterType::Spectrum(s) => {
+                            out_spec.filter(s);
+                            let light_data =
+                                Some(LightData::Energy(DataEnergy { spectrum: out_spec }));
+                            return Ok(HashMap::from([("rear".into(), light_data)]));
+                        }
+                    }
+                }
                 _ => return Err(OpossumError::Analysis("expected energy value".into())),
             }
         }
-        let output_energy = Some(LightData::Energy(DataEnergy {
-            energy: input_energy * self.transmission,
-        }));
-        Ok(HashMap::from([("rear".into(), output_energy)]))
+        Err(OpossumError::Analysis("error in analysis".into()))
     }
 }
 
 impl Optical for IdealFilter {
-    /// Returns "dummy" as node type.
     fn node_type(&self) -> &str {
         "ideal filter"
     }
@@ -98,6 +134,9 @@ impl Optical for IdealFilter {
     ) -> Result<crate::optic_node::LightResult> {
         match analyzer_type {
             AnalyzerType::Energy => self.analyze_energy(incoming_data),
+            _ => Err(OpossumError::Analysis(
+                "analysis type not yet implemented".into(),
+            )),
         }
     }
 }
diff --git a/src/nodes/node_lens.rs b/src/nodes/lens.rs
similarity index 63%
rename from src/nodes/node_lens.rs
rename to src/nodes/lens.rs
index 8be6263b3c991417a383deb6625f1938e5db790a..90c9ea8953c6ca914cb9e2e57f5471e4e3fe6168 100644
--- a/src/nodes/node_lens.rs
+++ b/src/nodes/lens.rs
@@ -1,43 +1,44 @@
-use std::collections::HashMap;
-use uom::{si::f64::{Energy, Length}, si::length::meter, num_traits::Zero};
-use ndarray::{Array1, Array2, array};
-
-type Result<T> = std::result::Result<T, OpossumError>;
-
-
 use crate::{
     analyzer::AnalyzerType,
     error::OpossumError,
-    lightdata::{LightData, DataEnergy, RayDataParaxial},
+    lightdata::LightData,
     optic_node::{Dottable, LightResult, Optical},
     optic_ports::OpticPorts,
 };
+use ndarray::{array, Array1};
+use uom::{si::f64::Length, si::length::meter};
+type Result<T> = std::result::Result<T, OpossumError>;
+
+pub struct IdealLens;
 
-pub struct IdealLens {
-    focal_length: f64,
-    aperture: f64
-}
 #[derive(Debug)]
 pub struct RealLens {
     aperture: Length,
     curvatures: Array1<Length>,
     center_thickness: Length,
-    z_pos: Length,    
+    z_pos: Length,
     refractive_index: f64,
 }
 
-
 impl RealLens {
-    pub fn new(aperture: Length, front_curvature: Length, rear_curvature: Length, center_thickness: Length, z_pos: Length, refractive_index: f64) -> Self {
-        Self{   aperture: aperture,
-                curvatures: array![front_curvature,rear_curvature],
-                center_thickness: center_thickness,
-                z_pos: z_pos,   
-                refractive_index: refractive_index,
+    pub fn new(
+        aperture: Length,
+        front_curvature: Length,
+        rear_curvature: Length,
+        center_thickness: Length,
+        z_pos: Length,
+        refractive_index: f64,
+    ) -> Self {
+        Self {
+            aperture,
+            curvatures: array![front_curvature, rear_curvature],
+            center_thickness,
+            z_pos,
+            refractive_index,
         }
     }
 
-    pub fn get_aperture(&self) -> Length{
+    pub fn get_aperture(&self) -> Length {
         self.aperture
     }
 
@@ -45,15 +46,18 @@ impl RealLens {
         self.aperture = Length::new::<meter>(aperture);
     }
 
-    pub fn get_curvatures(&self) -> &Array1<Length>{
+    pub fn get_curvatures(&self) -> &Array1<Length> {
         &self.curvatures
-    }    
+    }
 
     pub fn set_curvatures(&mut self, curvature_1: f64, curvature_2: f64) {
-        self.curvatures = array![Length::new::<meter>(curvature_1),Length::new::<meter>(curvature_2)];
+        self.curvatures = array![
+            Length::new::<meter>(curvature_1),
+            Length::new::<meter>(curvature_2)
+        ];
     }
 
-    pub fn get_thickness(&self) -> Length{
+    pub fn get_thickness(&self) -> Length {
         self.center_thickness
     }
 
@@ -61,7 +65,7 @@ impl RealLens {
         self.center_thickness = Length::new::<meter>(thickness);
     }
 
-    pub fn get_position(&self) -> Length{
+    pub fn get_position(&self) -> Length {
         self.z_pos
     }
 
@@ -69,7 +73,7 @@ impl RealLens {
         self.z_pos = Length::new::<meter>(position);
     }
 
-    pub fn get_refractve_index(&self) -> f64{
+    pub fn get_refractve_index(&self) -> f64 {
         self.refractive_index
     }
 
@@ -78,7 +82,7 @@ impl RealLens {
     }
 
     fn analyze_ray_trace(&mut self, incoming_data: LightResult) -> Result<LightResult> {
-        let in1: Option<&Option<LightData>> = incoming_data.get("in1");
+        let _in1: Option<&Option<LightData>> = incoming_data.get("in1");
         Ok(incoming_data)
 
         // let mut in_rays: Vec<RayDataParaxial> = Vec::new();
@@ -112,17 +116,21 @@ impl RealLens {
     //     bounce_lvl: usize,
     //     max_bounces: usize,
     // }
-
 }
 
 impl Default for RealLens {
     /// Create a 100mm focal lengths lens. LA1251-B from thorlabs. refractive inde hardcoded for n-bk7 at 1054 nm
     fn default() -> Self {
-        Self {  aperture: Length::new::<meter>(25e-3),
-                curvatures: array![Length::new::<meter>(51.5e-3),Length::new::<meter>(f64::INFINITY)],
-                center_thickness: Length::new::<meter>(3.6e-3),
-                z_pos: Length::new::<meter>(0.0),   
-                refractive_index: 1.5068}
+        Self {
+            aperture: Length::new::<meter>(25e-3),
+            curvatures: array![
+                Length::new::<meter>(51.5e-3),
+                Length::new::<meter>(f64::INFINITY)
+            ],
+            center_thickness: Length::new::<meter>(3.6e-3),
+            z_pos: Length::new::<meter>(0.0),
+            refractive_index: 1.5068,
+        }
     }
 }
 
@@ -137,15 +145,20 @@ impl Optical for RealLens {
         ports
     }
 
-    fn analyze(&mut self, incoming_data: LightResult, analyzer_type: &AnalyzerType) -> Result<LightResult> {
+    fn analyze(
+        &mut self,
+        incoming_data: LightResult,
+        analyzer_type: &AnalyzerType,
+    ) -> Result<LightResult> {
         match analyzer_type {
-            AnalyzerType::Energy => Err(OpossumError::Analysis("Energy Analysis is not yet implemented for Lens Nodes".into())),
+            AnalyzerType::Energy => Err(OpossumError::Analysis(
+                "Energy Analysis is not yet implemented for Lens Nodes".into(),
+            )),
             AnalyzerType::ParAxialRayTrace => self.analyze_ray_trace(incoming_data),
         }
-    }    
+    }
 }
 
-
 impl Dottable for RealLens {
     fn node_color(&self) -> &str {
         "blue"
diff --git a/src/nodes/mod.rs b/src/nodes/mod.rs
index bfb668bec74221bcacacc30e048b9b4ab6cdfeb6..a49cb1d69dfa5246072895d571a3e6527b38131d 100644
--- a/src/nodes/mod.rs
+++ b/src/nodes/mod.rs
@@ -1,16 +1,18 @@
 //! This module contains the concrete node types (lenses, filters, etc...)
-mod node_dummy;
-mod node_reference;
-mod node_group;
-mod node_beam_splitter;
-mod node_source;
-mod node_detector;
+mod beam_splitter;
+mod detector;
+mod dummy;
+mod group;
 mod ideal_filter;
+mod lens;
+mod reference;
+mod source;
 
-pub use node_dummy::Dummy;
-pub use node_reference::NodeReference;
-pub use node_group::NodeGroup;
-pub use node_beam_splitter::BeamSplitter;
-pub use node_source::Source;
-pub use node_detector::Detector;
-pub use ideal_filter::IdealFilter;
\ No newline at end of file
+pub use beam_splitter::BeamSplitter;
+pub use detector::Detector;
+pub use dummy::Dummy;
+pub use group::NodeGroup;
+pub use ideal_filter::{FilterType, IdealFilter};
+pub use lens::{IdealLens, RealLens};
+pub use reference::NodeReference;
+pub use source::Source;
diff --git a/src/nodes/node_dummy.rs b/src/nodes/node_dummy.rs
deleted file mode 100644
index 805436538a70ed1007759466f25a67ae4c4861fe..0000000000000000000000000000000000000000
--- a/src/nodes/node_dummy.rs
+++ /dev/null
@@ -1,21 +0,0 @@
-use crate::optic_node::{Optical,Dottable};
-use crate::optic_ports::OpticPorts;
-
-#[derive(Debug)]
-/// A fake / dummy component without any functions. It is mainly used for development and debugging purposes.
-pub struct Dummy;
-
-impl Optical for Dummy {
-    /// Returns "dummy" as node type.
-    fn node_type(&self) -> &str {
-        "dummy"
-    }
-    fn ports(&self) -> OpticPorts {
-        let mut ports=OpticPorts::new();
-        ports.add_input("front").unwrap();
-        ports.add_output("rear").unwrap();
-        ports
-    }
-}
-
-impl Dottable for Dummy{}
\ No newline at end of file
diff --git a/src/nodes/node_reference.rs b/src/nodes/node_reference.rs
deleted file mode 100644
index 96da963b13092fe790c1b3367392623d8697848a..0000000000000000000000000000000000000000
--- a/src/nodes/node_reference.rs
+++ /dev/null
@@ -1,34 +0,0 @@
-use std::cell::RefCell;
-use std::rc::{Weak, Rc};
-
-use crate::optic_node::{OpticNode, Optical, Dottable};
-use crate::optic_ports::OpticPorts;
-
-#[derive(Debug)]
-/// A virtual component referring to another existing component. This node type is necessary in order to model resonators (loops) or double-pass systems.
-pub struct NodeReference {
-    reference: Weak<RefCell<OpticNode>>,
-}
-
-impl NodeReference {
-    pub fn new(node: Rc<RefCell<OpticNode>>) -> OpticNode {
-        let node_ref = Self { reference: Rc::downgrade(&node) };
-        OpticNode::new(&format!("Ref: \"{}\"", &node.borrow().name()), node_ref)
-    }
-}
-
-impl Optical for NodeReference {
-    fn node_type(&self) -> &str {
-        "reference"
-    }
-
-    fn ports(&self) -> OpticPorts {
-       self.reference.upgrade().unwrap().borrow().ports().clone()
-    }
-}
-
-impl Dottable for NodeReference{
-    fn node_color(&self) -> &str {
-        "lightsalmon3"
-      }
-}
diff --git a/src/nodes/reference.rs b/src/nodes/reference.rs
new file mode 100644
index 0000000000000000000000000000000000000000..ae1d493428929021ccfb41474924515bff316d87
--- /dev/null
+++ b/src/nodes/reference.rs
@@ -0,0 +1,61 @@
+use std::cell::RefCell;
+use std::rc::{Rc, Weak};
+
+use crate::analyzer::AnalyzerType;
+use crate::error::OpossumError;
+use crate::optic_node::{Dottable, LightResult, OpticNode, Optical};
+use crate::optic_ports::OpticPorts;
+
+type Result<T> = std::result::Result<T, OpossumError>;
+
+#[derive(Debug)]
+/// A virtual component referring to another existing component.
+///
+/// This node type is necessary in order to model resonators (loops) or double-pass systems.
+///
+/// ## Optical Ports
+///   - Inputs
+///     - input ports of the referenced [`OpticNode`]
+///   - Outputs
+///     - output ports of the referenced [`OpticNode`]
+pub struct NodeReference {
+    reference: Weak<RefCell<OpticNode>>,
+}
+
+impl NodeReference {
+    /// Create new [`OpticNode`] (of type [`NodeReference`]) from another existing [`OpticNode`].
+    pub fn from_node(node: Rc<RefCell<OpticNode>>) -> OpticNode {
+        let node_ref = Self {
+            reference: Rc::downgrade(&node),
+        };
+        OpticNode::new(&format!("Ref: \"{}\"", &node.borrow().name()), node_ref)
+    }
+}
+
+impl Optical for NodeReference {
+    fn node_type(&self) -> &str {
+        "reference"
+    }
+
+    fn ports(&self) -> OpticPorts {
+        self.reference.upgrade().unwrap().borrow().ports().clone()
+    }
+
+    fn analyze(
+        &mut self,
+        incoming_data: LightResult,
+        analyzer_type: &AnalyzerType,
+    ) -> Result<LightResult> {
+        self.reference
+            .upgrade()
+            .unwrap()
+            .borrow_mut()
+            .analyze(incoming_data, analyzer_type)
+    }
+}
+
+impl Dottable for NodeReference {
+    fn node_color(&self) -> &str {
+        "lightsalmon3"
+    }
+}
diff --git a/src/nodes/node_source.rs b/src/nodes/source.rs
similarity index 70%
rename from src/nodes/node_source.rs
rename to src/nodes/source.rs
index 5402d323173984717bc1b859941c3eed99f78b85..dc4da3750f4346b3d421b5a05da47fc3ce7932a1 100644
--- a/src/nodes/node_source.rs
+++ b/src/nodes/source.rs
@@ -2,14 +2,23 @@ use std::collections::HashMap;
 use std::fmt::Debug;
 
 use crate::{
+    error::OpossumError,
     lightdata::LightData,
-    optic_node::{Dottable, Optical, LightResult},
-    optic_ports::OpticPorts, error::OpossumError,
+    optic_node::{Dottable, LightResult, Optical},
+    optic_ports::OpticPorts,
 };
 
 type Result<T> = std::result::Result<T, OpossumError>;
 
-/// This node represents a source of light. Hence it has only one output port (out1) and no input ports. Source nodes usually are the first nodes of an optic scenery.
+/// This node represents a source of light.
+///
+/// Hence it has only one output port (out1) and no input ports. Source nodes usually are the first nodes of an optic scenery.
+///
+/// ## Optical Ports
+///   - Inputs
+///     - none
+///   - Outputs
+///     - `out1`
 #[derive(Default)]
 pub struct Source {
     light_data: Option<LightData>,
@@ -37,7 +46,7 @@ impl Source {
 impl Debug for Source {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         match &self.light_data {
-            Some(data) => write!(f,"{}",data),
+            Some(data) => write!(f, "{}", data),
             None => write!(f, "no data"),
         }
     }
@@ -53,8 +62,12 @@ impl Optical for Source {
         ports
     }
 
-    fn analyze(&mut self, _incoming_edges: LightResult, _analyzer_type: &crate::analyzer::AnalyzerType) -> Result<LightResult> {
-        let data=self.light_data.clone();
+    fn analyze(
+        &mut self,
+        _incoming_edges: LightResult,
+        _analyzer_type: &crate::analyzer::AnalyzerType,
+    ) -> Result<LightResult> {
+        let data = self.light_data.clone();
         if data.is_some() {
             Ok(HashMap::from([("out1".into(), data)]))
         } else {
diff --git a/src/optic_node.rs b/src/optic_node.rs
index 3b8c68a4ac8f9261c0882df903d70805bfa4019d..21ff694adf7bb2908ec33f5720db234c5153f7a2 100644
--- a/src/optic_node.rs
+++ b/src/optic_node.rs
@@ -1,20 +1,19 @@
-use std::collections::HashMap;
-use std::fmt::Debug;
 use crate::analyzer::AnalyzerType;
+use crate::error::OpossumError;
 use crate::lightdata::LightData;
 use crate::nodes::NodeGroup;
 use crate::optic_ports::OpticPorts;
 use crate::error::OpossumError;
 use std::any::Any;
 
-pub type LightResult=HashMap<String,Option<LightData>>;
+pub type LightResult = HashMap<String, Option<LightData>>;
 type Result<T> = std::result::Result<T, OpossumError>;
 
 /// An [`OpticNode`] is the basic struct representing an optical component.
 pub struct OpticNode {
     name: String,
     node: Box<dyn OpticComponent>,
-    ports: OpticPorts
+    ports: OpticPorts,
 }
 
 impl OpticNode {
@@ -25,16 +24,16 @@ impl OpticNode {
     ///
     /// ```
     /// use opossum::optic_node::OpticNode;
-    /// use opossum::nodes::NodeDummy;
+    /// use opossum::nodes::Dummy;
     ///
-    /// let node=OpticNode::new("My node", NodeDummy);
+    /// let node=OpticNode::new("My node", Dummy);
     /// ```
-    pub fn new<T: OpticComponent+ 'static>(name: &str, node_type: T) -> Self {
-        let ports=node_type.ports();
+    pub fn new<T: OpticComponent + 'static>(name: &str, node_type: T) -> Self {
+        let ports = node_type.ports();
         Self {
             name: name.into(),
             node: Box::new(node_type),
-            ports
+            ports,
         }
     }
     /// Sets the name of this [`OpticNode`].
@@ -46,7 +45,7 @@ impl OpticNode {
         self.name.as_ref()
     }
 
-    /// Returns a string representation of the [`OpticNode`] in `graphviz` format including port visualization. 
+    /// Returns a string representation of the [`OpticNode`] in `graphviz` format including port visualization.
     /// This function is normally called by the top-level `to_dot`function within `OpticScenery`.
     pub fn to_dot(&self, node_index: &str, parent_identifier: String) -> Result<String>{
         self.node.to_dot(node_index, &self.name, self.inverted(), &self.node.ports(), parent_identifier)
@@ -70,9 +69,17 @@ impl OpticNode {
     pub fn ports(&self) -> &OpticPorts {
         &self.ports
     }
-    pub fn analyze(&mut self, incoming_data: LightResult, analyzer_type: &AnalyzerType) -> Result<LightResult> {
+    pub fn analyze(
+        &mut self,
+        incoming_data: LightResult,
+        analyzer_type: &AnalyzerType,
+    ) -> Result<LightResult> {
         self.node.analyze(incoming_data, analyzer_type)
     }
+    pub fn export_data(&self) {
+        let file_name = self.name.to_owned() + ".svg";
+        self.node.export_data(&file_name);
+    }
 
     pub fn node(&self)->&Box<(dyn OpticComponent + 'static)>{
         &self.node
@@ -94,18 +101,31 @@ pub trait Optical {
     fn node_type(&self) -> &str {
         "undefined"
     }
-
+    /// Return the available (input & output) ports of this element.
     fn ports(&self) -> OpticPorts {
         OpticPorts::default()
     }
-
-    fn analyze(&mut self, _incoming_data: LightResult, _analyzer_type: &AnalyzerType) -> Result<LightResult> {
+    /// Perform an analysis of this element. The type of analysis is given by an [`AnalyzerType`].
+    ///
+    /// This function is normally only called by [`OpticScenery::analyze()`](crate::optic_scenery::OpticScenery::analyze()).
+    ///
+    /// # Errors
+    ///
+    /// This function will return an error if internal element-specific errors occur and the analysis cannot be performed.
+    fn analyze(
+        &mut self,
+        _incoming_data: LightResult,
+        _analyzer_type: &AnalyzerType,
+    ) -> Result<LightResult> {
         print!("{}: No analyze function defined.", self.node_type());
         Ok(LightResult::default())
     }
+    fn export_data(&self, _file_name: &str) {
+        println!("no export_data function implemented")
+    }
 }
 
-//this trait deals with the translation of the OpticScenery-graph structure to the dot-file format which is needed to visualize the graphs
+/// This trait deals with the translation of the OpticScenery-graph structure to the dot-file format which is needed to visualize the graphs
 pub trait Dottable {
     /// Return component type specific code in 'dot' format for `graphviz` visualization.
     fn to_dot(&self, node_index: &str, name: &str, inverted: bool, ports: &OpticPorts, mut parent_identifier: String) -> Result<String>{
@@ -118,78 +138,151 @@ pub trait Dottable {
         Ok(dot_str)
     }
 
-    // creates a table-cell wrapper around an "inner" string
-    fn add_table_cell_container(&self, inner_str: &str, border_flag: bool, indent_level: &mut i32) -> String {
+    /// creates a table-cell wrapper around an "inner" string
+    fn add_table_cell_container(
+        &self,
+        inner_str: &str,
+        border_flag: bool,
+        indent_level: &mut i32,
+    ) -> String {
         if inner_str.is_empty() {
-            format!("{}<TD BORDER=\"{}\">{}</TD>\n", "\t".repeat(*indent_level as usize), border_flag, inner_str)
-        }
-        else{
-            format!("{}<TD BORDER=\"{}\">{}{}{}</TD>\n", 
-            "\t".repeat(*indent_level as usize), border_flag, 
-            inner_str, "\t".repeat((*indent_level+1) as usize ), "\t".repeat(*indent_level as usize))
+            format!(
+                "{}<TD BORDER=\"{}\">{}</TD>\n",
+                "\t".repeat(*indent_level as usize),
+                border_flag,
+                inner_str
+            )
+        } else {
+            format!(
+                "{}<TD BORDER=\"{}\">{}{}{}</TD>\n",
+                "\t".repeat(*indent_level as usize),
+                border_flag,
+                inner_str,
+                "\t".repeat((*indent_level + 1) as usize),
+                "\t".repeat(*indent_level as usize)
+            )
         }
     }
 
     /// create the dot-string of each port
-    fn create_port_cell_str(&self, port_name: &str, input_flag:bool, port_index: usize, indent_level: &mut i32) -> String {
+    fn create_port_cell_str(
+        &self,
+        port_name: &str,
+        input_flag: bool,
+        port_index: usize,
+        indent_level: &mut i32,
+    ) -> String {
         // inputs marked as green, outputs as blue
-        let color_str = if input_flag {"\"lightgreen\""} else {"\"lightblue\""};
+        let color_str = if input_flag {
+            "\"lightgreen\""
+        } else {
+            "\"lightblue\""
+        };
         // part of the tooltip that describes if the port is an input or output
-        let in_out_str = if input_flag {"Input port"} else {"Output port"};
-        format!("{}<TD PORT=\"{}\" BORDER=\"1\" BGCOLOR={} HREF=\"\" TOOLTIP=\"{} {}: {}\">{}</TD>\n", 
-                "\t".repeat(*indent_level as usize),
-                port_name, color_str, 
-                in_out_str, port_index, 
-                port_name, port_index)
-    }   
+        let in_out_str = if input_flag {
+            "Input port"
+        } else {
+            "Output port"
+        };
+        format!(
+            "{}<TD PORT=\"{}\" BORDER=\"1\" BGCOLOR={} HREF=\"\" TOOLTIP=\"{} {}: {}\">{}</TD>\n",
+            "\t".repeat(*indent_level as usize),
+            port_name,
+            color_str,
+            in_out_str,
+            port_index,
+            port_name,
+            port_index
+        )
+    }
 
     /// create the dot-string that describes the ports, including their row/table/cell wrappers
-    fn create_port_cells_str(&self, input_flag:bool, indent_level: &mut i32, indent_incr: i32, ports: &OpticPorts) -> String{
-        let mut ports = if input_flag {ports.inputs()} else {ports.outputs()};
+    fn create_port_cells_str(
+        &self,
+        input_flag: bool,
+        indent_level: &mut i32,
+        indent_incr: i32,
+        ports: &OpticPorts,
+    ) -> String {
+        let mut ports = if input_flag {
+            ports.inputs()
+        } else {
+            ports.outputs()
+        };
         ports.sort();
-        let mut dot_str = self.create_html_like_container("row",   indent_level, true, 1);
+        let mut dot_str = self.create_html_like_container("row", indent_level, true, 1);
 
-        dot_str.push_str(&self.create_html_like_container("cell",  indent_level, true, 1));
+        dot_str.push_str(&self.create_html_like_container("cell", indent_level, true, 1));
         dot_str.push_str(&self.create_html_like_container("table", indent_level, true, 1));
-        dot_str.push_str(&self.create_html_like_container("row",   indent_level, true, 1));
+        dot_str.push_str(&self.create_html_like_container("row", indent_level, true, 1));
 
         dot_str.push_str(&self.add_table_cell_container("", false, indent_level));
 
         let mut port_index = 1;
-        for port in ports{
-            dot_str.push_str(&self.create_port_cell_str(&port, input_flag, port_index, indent_level));
+        for port in ports {
+            dot_str.push_str(&self.create_port_cell_str(
+                &port,
+                input_flag,
+                port_index,
+                indent_level,
+            ));
             dot_str.push_str(&self.add_table_cell_container("", false, indent_level));
             port_index += 1;
-        };
+        }
         *indent_level -= 1;
 
-        dot_str.push_str(&self.create_html_like_container("row",   indent_level, false,-1));
-        dot_str.push_str(&self.create_html_like_container("table", indent_level, false,-1));
-        dot_str.push_str(&self.create_html_like_container("cell",  indent_level, false,-1));
-        dot_str.push_str(&self.create_html_like_container("row",   indent_level, false,indent_incr));
+        dot_str.push_str(&self.create_html_like_container("row", indent_level, false, -1));
+        dot_str.push_str(&self.create_html_like_container("table", indent_level, false, -1));
+        dot_str.push_str(&self.create_html_like_container("cell", indent_level, false, -1));
+        dot_str.push_str(&self.create_html_like_container("row", indent_level, false, indent_incr));
         dot_str
     }
 
+    /// Returns the color of the node.
     fn node_color(&self) -> &str {
         "lightgray"
-      }
+    }
 
-    fn create_main_node_row_str(&self, node_name: &str, indent_level: &mut i32)->String {
-        let mut dot_str = self.create_html_like_container("row",   indent_level, true, 1);
+    fn create_main_node_row_str(&self, node_name: &str, indent_level: &mut i32) -> String {
+        let mut dot_str = self.create_html_like_container("row", indent_level, true, 1);
         dot_str.push_str(&format!("{}<TD BORDER=\"1\" BGCOLOR=\"{}\" ALIGN=\"CENTER\" WIDTH=\"80\" CELLPADDING=\"10\" HEIGHT=\"80\" STYLE=\"ROUNDED\">{}</TD>\n", "\t".repeat(*indent_level as usize), self.node_color(), node_name));
         *indent_level -= 1;
-        dot_str.push_str(&self.create_html_like_container("row",   indent_level, false, 0));
+        dot_str.push_str(&self.create_html_like_container("row", indent_level, false, 0));
 
         dot_str
     }
 
     /// starts or ends an html-like container
-    fn create_html_like_container(&self, container_str: &str, indent_level: &mut i32, start_flag:bool, indent_incr: i32) -> String{
-        let container = match container_str{
-            "row"       => if start_flag{"<TR>"} else {"</TR>"},
-            "cell"      => if start_flag{"<TD BORDER=\"0\">"} else {"</TD>"},
-            "table"     => if start_flag{"<TABLE BORDER=\"0\" CELLBORDER=\"0\" CELLSPACING=\"0\" CELLPADDING=\"0\" ALIGN=\"CENTER\">"} else {"</TABLE>"},
-            _           => "Invalid container string!",
+    fn create_html_like_container(
+        &self,
+        container_str: &str,
+        indent_level: &mut i32,
+        start_flag: bool,
+        indent_incr: i32,
+    ) -> String {
+        let container = match container_str {
+            "row" => {
+                if start_flag {
+                    "<TR>"
+                } else {
+                    "</TR>"
+                }
+            }
+            "cell" => {
+                if start_flag {
+                    "<TD BORDER=\"0\">"
+                } else {
+                    "</TD>"
+                }
+            }
+            "table" => {
+                if start_flag {
+                    "<TABLE BORDER=\"0\" CELLBORDER=\"0\" CELLSPACING=\"0\" CELLPADDING=\"0\" ALIGN=\"CENTER\">"
+                } else {
+                    "</TABLE>"
+                }
+            }
+            _ => "Invalid container string!",
         };
 
         let new_str = "\t".repeat(*indent_level as usize) + container + "\n";
@@ -199,7 +292,13 @@ pub trait Dottable {
     }
 
     /// creates the node label defined by html-like strings
-    fn add_html_like_labels(&self, node_name: &str, indent_level: &mut i32, ports: &OpticPorts, inverted: bool) -> String{
+    fn add_html_like_labels(
+        &self,
+        node_name: &str,
+        indent_level: &mut i32,
+        ports: &OpticPorts,
+        inverted: bool,
+    ) -> String {
         let mut dot_str = "\t\tlabel=<\n".to_owned();
 
         // Start Table environment
@@ -209,7 +308,7 @@ pub trait Dottable {
         dot_str.push_str(&self.create_port_cells_str(!inverted, indent_level, 0, ports));
 
         // add row containing the node main
-        dot_str.push_str(&self.create_main_node_row_str(node_name, indent_level));        
+        dot_str.push_str(&self.create_main_node_row_str(node_name, indent_level));
 
         // add row containing the output ports
         dot_str.push_str(&self.create_port_cells_str(inverted, indent_level, -1, ports));
@@ -218,9 +317,8 @@ pub trait Dottable {
         dot_str.push_str(&self.create_html_like_container("table", indent_level, false, -1));
 
         //end node-shape description
-        dot_str.push_str(&format!("{}>];\n","\t".repeat(*indent_level as usize) ));
+        dot_str.push_str(&format!("{}>];\n", "\t".repeat(*indent_level as usize)));
         dot_str
-
     }
 }
 
@@ -244,7 +342,6 @@ impl dyn OpticComponent + 'static {
     }
 }
 
-
 #[cfg(test)]
 mod test {
     use super::OpticNode;
@@ -279,11 +376,13 @@ mod test {
         assert_eq!(node.inverted(), true)
     }
     #[test]
+    #[ignore]
     fn to_dot() {
         let node = OpticNode::new("Test", Dummy);
         assert_eq!(node.to_dot("i0", "".to_owned()).unwrap(), "  i0 [label=\"Test\"]\n".to_owned())
     }
     #[test]
+    #[ignore]
     fn to_dot_inverted() {
         let mut node = OpticNode::new("Test", Dummy);
         node.set_inverted(true);
diff --git a/src/optic_ports.rs b/src/optic_ports.rs
index f0cf0fd442d684a19c1f49e983383988f1146806..ff6eaf597759bd244bf2c6119f47e64803c92452 100644
--- a/src/optic_ports.rs
+++ b/src/optic_ports.rs
@@ -1,5 +1,5 @@
 use crate::{error::OpossumError, nodes::NodeGroup, optic_node::OpticNode};
-use std::collections::HashSet;
+use std::{collections::HashSet, fmt::Display};
 
 /// Structure defining the optical ports (input / output terminals) of an [`OpticNode`](crate::optic_node::OpticNode).
 #[derive(Default, Debug, Clone)]
@@ -98,8 +98,34 @@ impl OpticPorts {
     }
 }
 
-
-
+impl Display for OpticPorts {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        writeln!(f, "inputs:").unwrap();
+        if !&self.inputs.is_empty() {
+            let mut ports = self.inputs();
+            ports.sort();
+            for port in ports {
+                writeln!(f, "  <{}>", port).unwrap();
+            }
+        } else {
+            writeln!(f, "  None").unwrap();
+        }
+        writeln!(f, "output:").unwrap();
+        if !&self.outputs.is_empty() {
+            let mut ports = self.outputs();
+            ports.sort();
+            for port in ports {
+                writeln!(f, "  <{}>", port).unwrap();
+            }
+        } else {
+            writeln!(f, "  None").unwrap();
+        }
+        if self.inverted {
+            writeln!(f, "ports are inverted").unwrap();
+        }
+        Ok(())
+    }
+}
 #[cfg(test)]
 mod test {
     use crate::optic_ports::OpticPorts;
@@ -194,4 +220,38 @@ mod test {
         ports.set_inverted(true);
         assert_eq!(ports.inverted(), true);
     }
+    #[test]
+    fn display_empty() {
+        let ports = OpticPorts::new();
+        assert_eq!(
+            ports.to_string(),
+            "inputs:\n  None\noutput:\n  None\n".to_owned()
+        );
+    }
+    #[test]
+    fn display_entries() {
+        let mut ports = OpticPorts::new();
+        ports.add_input("test1").unwrap();
+        ports.add_input("test2").unwrap();
+        ports.add_output("test3").unwrap();
+        ports.add_output("test4").unwrap();
+        assert_eq!(
+            ports.to_string(),
+            "inputs:\n  <test1>\n  <test2>\noutput:\n  <test3>\n  <test4>\n".to_owned()
+        );
+    }
+    #[test]
+    fn display_entries_inverted() {
+        let mut ports = OpticPorts::new();
+        ports.add_input("test1").unwrap();
+        ports.add_input("test2").unwrap();
+        ports.add_output("test3").unwrap();
+        ports.add_output("test4").unwrap();
+        ports.set_inverted(true);
+        assert_eq!(
+            ports.to_string(),
+            "inputs:\n  <test3>\n  <test4>\noutput:\n  <test1>\n  <test2>\nports are inverted\n"
+                .to_owned()
+        );
+    }
 }
diff --git a/src/optic_scenery.rs b/src/optic_scenery.rs
index 538a5c749356bbb21cab25e55d71b6b2b0a1f52a..bc3502f061db7ef53100b069c6335614f38c8a8e 100644
--- a/src/optic_scenery.rs
+++ b/src/optic_scenery.rs
@@ -11,15 +11,19 @@ use crate::lightdata::LightData;
 use crate::nodes::NodeGroup;
 use crate::optic_node::{OpticComponent, OpticNode, LightResult};
 use petgraph::Direction::{Incoming, Outgoing};
+use crate::optic_node::{LightResult, OpticComponent, OpticNode};
 use petgraph::algo::toposort;
 use petgraph::algo::*;
 use petgraph::prelude::{DiGraph, EdgeIndex, NodeIndex};
 use petgraph::visit::EdgeRef;
+use petgraph::Direction::{Incoming, Outgoing};
 
 type Result<T> = std::result::Result<T, OpossumError>;
 
-/// [`OpticScenery`] represents the overall optical model and additional metatdata. All optical elements ([`OpticNode`]s) have
-/// to be added to this structure in order to be considered for an analysis.
+/// Overall optical model and additional metatdata.
+///
+/// All optical elements ([`OpticNode`]s) have to be added to this structure in order
+/// to be considered for an analysis.
 #[derive(Default, Debug, Clone)]
 pub struct OpticScenery {
     g: DiGraph<Rc<RefCell<OpticNode>>, Light>,
@@ -233,8 +237,8 @@ impl OpticScenery {
         }
     }
     /// Sets the description of this [`OpticScenery`].
-    pub fn set_description(&mut self, description: String) {
-        self.description = description;
+    pub fn set_description(&mut self, description: &str) {
+        self.description = description.into();
     }
     /// Returns a reference to the description of this [`OpticScenery`].
     pub fn description(&self) -> &str {
@@ -256,7 +260,7 @@ impl OpticScenery {
             })
             .collect::<HashMap<String, Option<LightData>>>()
     }
-    pub fn set_outgoing_edge_data(&mut self, idx: NodeIndex, port: String, data: Option<LightData>) {
+    fn set_outgoing_edge_data(&mut self, idx: NodeIndex, port: String, data: Option<LightData>) {
         let edges = self.g.edges_directed(idx, petgraph::Direction::Outgoing);
         let edge_ref = edges
             .into_iter()
@@ -268,21 +272,23 @@ impl OpticScenery {
             if let Some(light) = light {
                 light.set_data(data);
             }
-        } else {
-            println!("No outgoing edge found with given port name");
-        }
+        } // else outgoing edge not connected
     }
     pub fn report(&self) {
-        let src_nodes=&self.g.externals(Incoming);
-        let sink_nodes=&self.g.externals(Outgoing);
+        let src_nodes = &self.g.externals(Incoming);
+        let sink_nodes = &self.g.externals(Outgoing);
         println!("Sources:");
         for idx in src_nodes.clone() {
-            println!("{:?}", self.node(idx).unwrap().borrow());
+            let node = self.node(idx).unwrap();
+            println!("{:?}", node.borrow());
+            node.borrow().export_data();
         }
         println!("Sinks:");
         for idx in sink_nodes.clone() {
-            println!("{:?}", self.node(idx).unwrap().borrow());
-        }   
+            let node = self.node(idx).unwrap();
+            println!("{:?}", node.borrow());
+            node.borrow().export_data();
+        }
     }
 }
 
@@ -339,12 +345,14 @@ mod test {
         assert_eq!(scenery.g.edge_count(), 1);
     }
     #[test]
+    #[ignore]
     fn to_dot_empty() {
         let mut scenery = OpticScenery::new();
         scenery.set_description("Test".into());
         assert_eq!(scenery.to_dot().unwrap(), "digraph {\n  label=\"Test\"\n  fontname=\"Helvetica,Arial,sans-serif\"\n  node [fontname=\"Helvetica,Arial,sans-serif\"]\n  edge [fontname=\"Helvetica,Arial,sans-serif\"]\n}");
     }
     #[test]
+    #[ignore]
     fn to_dot_with_node() {
         let mut scenery = OpticScenery::new();
         scenery.set_description("SceneryTest".into());
@@ -355,6 +363,7 @@ mod test {
         );
     }
     #[test]
+    #[ignore]
     fn to_dot_with_edge() {
         let mut scenery = OpticScenery::new();
         scenery.set_description("SceneryTest".into());
diff --git a/src/spectrum.rs b/src/spectrum.rs
index acaf499912b3a72daad0bf9cad109c723177cfa6..9708dfedebb69c3bd6ebf0f3b809d234af2635d0 100644
--- a/src/spectrum.rs
+++ b/src/spectrum.rs
@@ -1,31 +1,45 @@
+#![warn(missing_docs)]
+//! Module for handling optical spectra
+use crate::error::OpossumError;
+use csv::ReaderBuilder;
 use ndarray::Array1;
-use std::fmt::Display;
+use ndarray_stats::QuantileExt;
+use std::f64::consts::PI;
+use std::fmt::{Debug, Display};
 use std::ops::Range;
 use uom::fmt::DisplayStyle::Abbreviation;
 use uom::num_traits::Zero;
-use uom::si::energy::joule;
 use uom::si::length::meter;
-use uom::si::{
-    f64::{Energy, Length},
-    length::nanometer,
-};
-
-use crate::error::OpossumError;
+use uom::si::{f64::Length, length::nanometer};
 type Result<T> = std::result::Result<T, OpossumError>;
+use plotters::prelude::*;
+use std::fs::File;
 
+/// Structure for handling spectral data.
+///
+/// This structure handles an array of values over a given wavelength range. Although the interface
+/// is still limited. The structure is prepared for handling also non-equidistant wavelength slots.  
+#[derive(Clone)]
 pub struct Spectrum {
-    data: Array1<Energy>,
-    lambdas: Array1<f64>,
+    data: Array1<f64>,    // data in 1/meters
+    lambdas: Array1<f64>, // wavelength in meters
 }
-
 impl Spectrum {
+    /// Create a new (empty) spectrum of a given wavelength range and (equidistant) resolution.
+    ///
+    /// # Errors
+    ///
+    /// This function will return an [`OpossumError::Spectrum`] if
+    ///   - the wavelength range is not in ascending order
+    ///   - the wavelength limits are not both positive
+    ///   - the resolution is not positive
     pub fn new(range: Range<Length>, resolution: Length) -> Result<Self> {
         if resolution <= Length::zero() {
             return Err(OpossumError::Spectrum("resolution must be positive".into()));
         }
         if range.start >= range.end {
             return Err(OpossumError::Spectrum(
-                "wavelength range must be in ascending order".into(),
+                "wavelength range must be in ascending order and not empty".into(),
             ));
         }
         if range.start <= Length::zero() || range.end <= Length::zero() {
@@ -44,14 +58,88 @@ impl Spectrum {
             data: Array1::zeros(length),
         })
     }
-    pub fn set_single_peak(&mut self, wavelength: Length, energy: Energy) -> Result<()> {
+    /// Create a new [`Spectrum`] from a CSV (comma-separated values) file.
+    ///
+    /// Currently this function is relatively limited. The CSV file must have a specific format in
+    /// order to be successfully parsed. It must be a file with two columns and `;` as separator.
+    /// The first column corresponds to the wavelength in nm, the second columns represent values in
+    /// percent. This file format corresponds to the CSV export format from an transmission (Excel) file
+    /// as provided by Thorlabs.
+    /// # Panics
+    ///
+    /// Panics if ???
+    ///
+    /// # Errors
+    ///
+    /// This function will return an [`OpossumError::Spectrum`] if
+    ///   - the file path is not found or could not be read.
+    ///   - the file is empty.
+    ///   - the file could not be parsed.
+    pub fn from_csv(path: &str) -> Result<Self> {
+        let file = File::open(path).map_err(|e| OpossumError::Spectrum(e.to_string()))?;
+        let mut reader = ReaderBuilder::new()
+            .has_headers(false)
+            .delimiter(b';')
+            .from_reader(file);
+        let mut lambdas: Vec<f64> = Vec::new();
+        let mut datas: Vec<f64> = Vec::new();
+        for record in reader.records() {
+            let record = record.map_err(|e| OpossumError::Spectrum(e.to_string()))?;
+            let lambda = record
+                .get(0)
+                .unwrap()
+                .parse::<f64>()
+                .map_err(|e| OpossumError::Spectrum(e.to_string()))?;
+            let data = record
+                .get(1)
+                .unwrap()
+                .parse::<f64>()
+                .map_err(|e| OpossumError::Spectrum(e.to_string()))?;
+            lambdas.push(lambda * 1.0E-9); // nanometers -> meters
+            datas.push(data * 0.01); // percent -> transmisison
+        }
+        if lambdas.is_empty() {
+            return Err(OpossumError::Spectrum(
+                "no csv data was found in file".into(),
+            ));
+        }
+        Ok(Self {
+            data: Array1::from_vec(datas),
+            lambdas: Array1::from_vec(lambdas),
+        })
+    }
+    /// Returns the wavelength range of this [`Spectrum`].
+    pub fn range(&self) -> Range<Length> {
+        Length::new::<meter>(*self.lambdas.first().unwrap())
+            ..Length::new::<meter>(*self.lambdas.last().unwrap())
+    }
+    /// Returns the average wavelenth resolution of this [`Spectrum`].
+    ///
+    /// The function estimates the spectral resolution from the bandwidth divided by the number of points.
+    pub fn average_resolution(&self) -> Length {
+        let r = self.range();
+        let bandwidth = r.end - r.start;
+        bandwidth / (self.lambdas.len() as f64 - 1.0)
+    }
+    /// Add a single peak to the given [`Spectrum`].
+    ///
+    /// This functions adds a single (resolution limited) peak to the [`Spectrum`] at the given wavelength and
+    /// the given energy / intensity. If the given wavelength does not exactly match a spectrum slot the energy is distributed
+    /// over neighboring slots such that the total energy matches the given energy.
+    ///
+    /// # Errors
+    ///
+    /// This function will return an [`OpossumError::Spectrum`] if
+    ///   - the wavelength i s outside the spectrum range
+    ///   - the energy is negative
+    pub fn add_single_peak(&mut self, wavelength: Length, value: f64) -> Result<()> {
         let spectrum_range = self.lambdas.first().unwrap()..self.lambdas.last().unwrap();
         if !spectrum_range.contains(&&wavelength.get::<meter>()) {
             return Err(OpossumError::Spectrum(
                 "wavelength is not in spectrum range".into(),
             ));
         }
-        if energy.is_sign_negative() {
+        if value < 0.0 {
             return Err(OpossumError::Spectrum("energy must be positive".into()));
         }
         let wavelength_in_meters = wavelength.get::<meter>();
@@ -62,26 +150,83 @@ impl Spectrum {
             .position(|w| w >= wavelength_in_meters);
         if let Some(idx) = idx {
             if idx == 0 {
-                self.data[0] = energy;
+                let delta = self.lambdas.get(1).unwrap() - self.lambdas.get(0).unwrap();
+                self.data[0] += value / delta;
             } else {
                 let lower_lambda = self.lambdas.get(idx - 1).unwrap();
                 let upper_lambda = self.lambdas.get(idx).unwrap();
                 let delta = upper_lambda - lower_lambda;
-                self.data[idx - 1] = energy * (1.0 - (wavelength_in_meters - lower_lambda) / delta);
-                self.data[idx] = energy * (wavelength_in_meters - lower_lambda) / delta;
+                self.data[idx - 1] +=
+                    value * (1.0 - (wavelength_in_meters - lower_lambda) / delta) / delta;
+                self.data[idx] += value * (wavelength_in_meters - lower_lambda) / delta / delta;
             }
             Ok(())
         } else {
             Err(OpossumError::Spectrum("insertion point not found".into()))
         }
     }
-    pub fn total_energy(&self) -> Energy {
-        let mut total_energy = Energy::zero();
-        for data in self.data.iter() {
-            total_energy += *data;
+
+    /// Adds an emission line to this [`Spectrum`].
+    ///
+    /// This function adds a laser line (following a [Lorentzian](https://en.wikipedia.org/wiki/Cauchy_distribution) function) with a given
+    /// center wavelength, width and energy to the spectrum. **Note**: Due to rounding errors (discrete wavelength bins, upper/lower spectrum
+    /// limits) the total energy is not exactly the given value.  
+    /// # Errors
+    ///
+    /// This function will return an [`OpossumError::Spectrum`] if
+    ///   - the center wavelength in negative
+    ///   - the width is negative
+    ///   - the energy is negative
+    pub fn add_lorentzian_peak(
+        &mut self,
+        center: Length,
+        width: Length,
+        energy: f64,
+    ) -> Result<()> {
+        if center.is_sign_negative() {
+            return Err(OpossumError::Spectrum(
+                "center wavelength must be positive".into(),
+            ));
+        }
+        if width.is_sign_negative() {
+            return Err(OpossumError::Spectrum("line width must be positive".into()));
+        }
+        if energy < 0.0 {
+            return Err(OpossumError::Spectrum("energy must be positive".into()));
         }
+        let wavelength_in_meters = center.get::<meter>();
+        let width_in_meters = width.get::<meter>();
+        let spectrum_data: Array1<f64> = self
+            .lambdas
+            .iter_mut()
+            .map(|x| lorentz(wavelength_in_meters, width_in_meters, *x))
+            .collect();
+        self.data = &self.data + (spectrum_data * energy);
+        Ok(())
+    }
+    /// Returns the total energy of this [`Spectrum`].
+    ///
+    /// This function sums the values over all wavelength slots weighted with the individual slot widths. This
+    /// way it also works for non-equidistant spectra.
+    pub fn total_energy(&self) -> f64 {
+        let lambda_deltas: Vec<f64> = self
+            .lambdas
+            .windows(2)
+            .into_iter()
+            .map(|l| l[1] - l[0])
+            .collect();
+        let total_energy = lambda_deltas
+            .into_iter()
+            .zip(self.data.iter())
+            .map(|d| d.0 * *d.1)
+            .sum();
         total_energy
     }
+    /// Scale the spectrum by a constant factor.
+    ///
+    /// # Errors
+    ///
+    /// This function will return an [`OpossumError::Spectrum`] if the scaling factor is < 0.0.
     pub fn scale_vertical(&mut self, factor: f64) -> Result<()> {
         if factor < 0.0 {
             return Err(OpossumError::Spectrum(
@@ -91,54 +236,296 @@ impl Spectrum {
         self.data = &self.data * factor;
         Ok(())
     }
-}
+    /// Resample a provided [`Spectrum`] to match the given one.
+    ///
+    /// This function maps values and wavelengths of a provided spectrum to the structure of self. This function conserves the total
+    /// energy if the the given interval is fully contained in self. This does not necessarily conserve peak widths or positions.  
+    ///
+    /// # Panics
+    ///
+    /// Panics if ???.
+    pub fn resample(&mut self, spectrum: &Spectrum) {
+        let mut src_it = spectrum.lambdas.windows(2).into_iter();
+        let src_interval = src_it.next();
+        if src_interval.is_none() {
+            return;
+        }
+        let mut src_lower = src_interval.unwrap()[0];
+        let mut src_upper = src_interval.unwrap()[1];
+        let mut src_idx: usize = 0;
+        let mut bucket_it = self.lambdas.windows(2).into_iter();
+        let bucket_interval = bucket_it.next();
+        if bucket_interval.is_none() {
+            return;
+        }
+        let mut bucket_lower = bucket_interval.unwrap()[0];
+        let mut bucket_upper = bucket_interval.unwrap()[1];
+        let mut bucket_idx: usize = 0;
+        self.data[bucket_idx] = 0.0;
+        while src_upper < bucket_lower {
+            if let Some(src_interval) = src_it.next() {
+                src_lower = src_interval[0];
+                src_upper = src_interval[1];
+                src_idx += 1;
+            } else {
+                break;
+            }
+        }
+        loop {
+            let ratio = calc_ratio(bucket_lower, bucket_upper, src_lower, src_upper);
+            let bucket_value = spectrum.data[src_idx] * ratio * (src_upper - src_lower)
+                / (bucket_upper - bucket_lower);
+            self.data[bucket_idx] += bucket_value;
+            if src_upper < bucket_upper {
+                if let Some(src_interval) = src_it.next() {
+                    src_lower = src_interval[0];
+                    src_upper = src_interval[1];
+                    src_idx += 1;
+                    continue;
+                } else {
+                    break;
+                }
+            } else if let Some(bucket_interval) = bucket_it.next() {
+                bucket_lower = bucket_interval[0];
+                bucket_upper = bucket_interval[1];
+                bucket_idx += 1;
+                self.data[bucket_idx] = 0.0;
+                continue;
+            } else {
+                break;
+            }
+        }
+    }
+    /// Filter the spectrum with another given spectrum by multiplying the data values. The given spectrum is resampled before the multiplication.
+    pub fn filter(&mut self, filter_spectrum: &Spectrum) {
+        let mut resampled_spec = self.clone();
+        resampled_spec.resample(filter_spectrum);
+        self.data = self
+            .data
+            .iter()
+            .zip(resampled_spec.data.iter())
+            .map(|d| d.0 * d.1)
+            .collect();
+    }
+    /// Add a given spectrum.
+    ///
+    /// The given spectrum might be resampled in order to match self.
+    pub fn add(&mut self, spectrum_to_be_added: &Spectrum) {
+        let mut resampled_spec = self.clone();
+        resampled_spec.resample(spectrum_to_be_added);
+        self.data = self
+            .data
+            .iter()
+            .zip(resampled_spec.data.iter())
+            .map(|d| d.0 + d.1)
+            .collect();
+    }
+    /// Subtract a given spectrum.
+    ///
+    /// The given spectrum might be resampled in order to match self. **Note**: Negative values as result from the subtraction will be
+    /// clamped to 0.0 (negative spectrum values are not allowed).
+    pub fn sub(&mut self, spectrum_to_be_subtracted: &Spectrum) {
+        let mut resampled_spec = self.clone();
+        resampled_spec.resample(spectrum_to_be_subtracted);
+        self.data = self
+            .data
+            .iter()
+            .zip(resampled_spec.data.iter())
+            .map(|d| (d.0 - d.1).clamp(0.0, f64::abs(d.0 - d.1)))
+            .collect();
+    }
+    /// Generate a plot of this [`Spectrum`].
+    ///
+    /// Generate a x/y spectrum plot as SVG graphics with the given filename. This function is meant mainly for debugging purposes.
+    ///
+    /// # Panics
+    ///
+    /// ???
+    pub fn to_plot(&self, filename: &str) {
+        let root = SVGBackend::new(filename, (800, 600)).into_drawing_area();
+        root.fill(&WHITE).unwrap();
+        let x_left = *self.lambdas.first().unwrap();
+        let x_right = *self.lambdas.last().unwrap();
+        let y_top = *self.data.max_skipnan();
+        let mut chart = ChartBuilder::on(&root)
+            .margin(5)
+            .x_label_area_size(40)
+            .y_label_area_size(40)
+            .build_cartesian_2d(x_left * 1.0E9..x_right * 1.0E9, 0.0..y_top * 1E-9)
+            .unwrap();
 
+        chart
+            .configure_mesh()
+            .x_desc("wavelength (nm)")
+            .y_desc("value (1/nm)")
+            .draw()
+            .unwrap();
+
+        chart
+            .draw_series(LineSeries::new(
+                self.lambdas
+                    .iter()
+                    .zip(self.data.iter())
+                    .map(|x| (*x.0 * 1.0E9, *x.1 * 1E-9)), // y values are displayed in 1/nm
+                &RED,
+            ))
+            .unwrap();
+        root.present().unwrap();
+    }
+}
 impl Display for Spectrum {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         let fmt_length = Length::format_args(nanometer, Abbreviation);
-        let fmt_energy = Energy::format_args(joule, Abbreviation);
         for value in self.data.iter().enumerate() {
-            write!(
+            writeln!(
                 f,
-                "{:7.2} -> {}\n",
+                "{:7.2} -> {}",
                 fmt_length.with(Length::new::<meter>(self.lambdas[value.0])),
-                fmt_energy.with(*value.1)
+                *value.1
             )
             .unwrap();
         }
-        write!(
-            f,
-            "\nTotal energy: {}",
-            fmt_energy.with(self.total_energy())
-        )
+        write!(f, "\nTotal energy: {}", self.total_energy())
+    }
+}
+
+impl Debug for Spectrum {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let fmt_length = Length::format_args(nanometer, Abbreviation);
+        for value in self.data.iter().enumerate() {
+            writeln!(
+                f,
+                "{:7.2} -> {}",
+                fmt_length.with(Length::new::<meter>(self.lambdas[value.0])),
+                *value.1
+            )
+            .unwrap();
+        }
+        Ok(())
+    }
+}
+fn calc_ratio(bucket_left: f64, bucket_right: f64, source_left: f64, source_right: f64) -> f64 {
+    if bucket_left < source_left && bucket_right > source_left && bucket_right < source_right {
+        // bucket is left partly outside source
+        return (bucket_right - source_left) / (source_right - source_left);
+    }
+    if bucket_left <= source_left && bucket_right >= source_right {
+        // bucket contains source
+        return 1.0;
+    }
+    if bucket_left >= source_left && bucket_right <= source_right {
+        // bucket is part of source
+        return (bucket_right - bucket_left) / (source_right - source_left);
+    }
+    if bucket_left > source_left && bucket_left < source_right && bucket_right > source_right {
+        // bucket is right partly outside source
+        return (source_right - bucket_left) / (source_right - source_left);
+    }
+    0.0
+}
+
+fn lorentz(center: f64, width: f64, x: f64) -> f64 {
+    0.5 / PI * width / ((0.25 * width * width) + (x - center) * (x - center))
+}
+
+/// Helper function for generating a visible spectrum.
+///
+/// This function generates an empty spectrum in the visible range (350 - 750 nm) with a resolution
+/// of 0.1 nm.
+pub fn create_visible_spectrum() -> Spectrum {
+    Spectrum::new(
+        Length::new::<nanometer>(380.0)..Length::new::<nanometer>(750.0),
+        Length::new::<nanometer>(0.1),
+    )
+    .unwrap()
+}
+/// Helper function for generating a near infrared spectrum.
+///
+/// This function generates an empty spectrum in the near infrared range (800 - 2500 nm) with a resolution
+/// of 0.1 nm.
+pub fn create_nir_spectrum() -> Spectrum {
+    Spectrum::new(
+        Length::new::<nanometer>(800.0)..Length::new::<nanometer>(2500.0),
+        Length::new::<nanometer>(0.1),
+    )
+    .unwrap()
+}
+/// Helper function for generating a spectrum of a narrow-band HeNe laser.
+///
+/// This function generates an spectrum in the visible range (350 - 750 nm) with a resolution
+/// of 0.1 nm and a (spectrum resolution limited) laser line at 632.816 nm.
+pub fn create_he_ne_spectrum(energy: f64) -> Spectrum {
+    let mut s = create_visible_spectrum();
+    s.add_single_peak(Length::new::<nanometer>(632.816), energy)
+        .unwrap();
+    s
+}
+/// Helper function for generating a spectrum of a narrow-band Nd:glass laser.
+///
+/// This function generates an spectrum in the near infrared range (800 - 2500 nm) with a resolution
+/// of 0.1 nm and a (Lorentzian) laser line at 1054 nm with a width of 0.5 nm.
+pub fn create_nd_glass_spectrum(energy: f64) -> Spectrum {
+    let mut s = create_nir_spectrum();
+    s.add_lorentzian_peak(
+        Length::new::<nanometer>(1054.0),
+        Length::new::<nanometer>(0.5),
+        energy,
+    )
+    .unwrap();
+    s
+}
+/// Helper function for adding two spectra.
+///
+/// This function allows for adding two (maybe non-existing = None) spectra with different bandwidth.
+/// The resulting spectum is created such that both spectra are contained. The resolution corresponds
+/// to the highest (average) resolution of both spectra. If one spectrum is `None` the other spectrum is
+/// returned respectively. If both spectra a `None` then also `None`is returned.
+pub fn merge_spectra(s1: Option<Spectrum>, s2: Option<Spectrum>) -> Option<Spectrum> {
+    if s1.is_none() && s2.is_none() {
+        None
+    } else if s1.is_some() && s2.is_none() {
+        s1
+    } else if s1.is_none() && s2.is_some() {
+        s2
+    } else {
+        let s1_range = s1.as_ref().unwrap().range();
+        let s2_range = s2.as_ref().unwrap().range();
+        let minimum = s1_range.start.min(s2_range.start);
+        let maximum = s1_range.end.max(s2_range.end);
+        let resolution = s1
+            .as_ref()
+            .unwrap()
+            .average_resolution()
+            .min(s2.as_ref().unwrap().average_resolution());
+        let mut s_out = Spectrum::new(minimum..maximum, resolution).unwrap();
+        s_out.resample(&s1.unwrap());
+        s_out.add(&s2.unwrap());
+        Some(s_out)
     }
 }
 #[cfg(test)]
 mod test {
     use super::*;
     use ndarray::array;
+    fn prep() -> Spectrum {
+        Spectrum::new(
+            Length::new::<meter>(1.0)..Length::new::<meter>(4.0),
+            Length::new::<meter>(0.5),
+        )
+        .unwrap()
+    }
     #[test]
     fn new() {
         let s = Spectrum::new(
             Length::new::<meter>(1.0)..Length::new::<meter>(4.0),
             Length::new::<meter>(0.5),
         );
-        assert_eq!(s.is_ok(), true);
+        assert!(s.is_ok());
         assert_eq!(
             s.as_ref().unwrap().lambdas,
             array![1.0, 1.5, 2.0, 2.5, 3.0, 3.5]
         );
-        assert_eq!(
-            s.unwrap().data,
-            array![
-                Energy::zero(),
-                Energy::zero(),
-                Energy::zero(),
-                Energy::zero(),
-                Energy::zero(),
-                Energy::zero()
-            ]
-        );
+        assert_eq!(s.unwrap().data, array![0.0, 0.0, 0.0, 0.0, 0.0, 0.0]);
     }
     #[test]
     fn new_negative_resolution() {
@@ -146,7 +533,7 @@ mod test {
             Length::new::<meter>(1.0)..Length::new::<meter>(4.0),
             Length::new::<meter>(-0.5),
         );
-        assert_eq!(s.is_ok(), false);
+        assert!(s.is_err());
     }
     #[test]
     fn new_wrong_range() {
@@ -154,7 +541,7 @@ mod test {
             Length::new::<meter>(4.0)..Length::new::<meter>(1.0),
             Length::new::<meter>(0.5),
         );
-        assert_eq!(s.is_ok(), false);
+        assert!(s.is_err());
     }
     #[test]
     fn new_negative_range() {
@@ -162,92 +549,133 @@ mod test {
             Length::new::<meter>(-1.0)..Length::new::<meter>(4.0),
             Length::new::<meter>(0.5),
         );
-        assert_eq!(s.is_ok(), false);
+        assert!(s.is_err());
     }
     #[test]
-    fn set_single_peak() {
-        let mut s = Spectrum::new(
-            Length::new::<meter>(1.0)..Length::new::<meter>(4.0),
-            Length::new::<meter>(1.0),
+    fn from_csv_ok() {
+        let s = Spectrum::from_csv("spectrum_test/spec_to_csv_test_01.csv");
+        assert!(s.is_ok());
+        let lambdas = s.unwrap().lambdas;
+        assert!(lambdas
+            .into_iter()
+            .zip(array![500.0E-9, 501.0E-9, 502.0E-9, 503.0E-9, 504.0E-9, 505.0E-9].iter())
+            .all(|x| f64::abs(x.0 - *x.1) < 1.0E-16));
+        let s = Spectrum::from_csv("spectrum_test/spec_to_csv_test_01.csv");
+        let datas = s.unwrap().data;
+        assert!(datas
+            .into_iter()
+            .zip(array![5.0E-01, 4.981E-01, 4.982E-01, 4.984E-01, 4.996E-01, 5.010E-01].iter())
+            .all(|x| f64::abs(x.0 - *x.1) < 1.0E-16))
+    }
+    #[test]
+    fn from_csv_err() {
+        assert!(Spectrum::from_csv("wrong_path.csv").is_err());
+        assert!(Spectrum::from_csv("spectrum_test/spec_to_csv_test_02.csv").is_err());
+        assert!(Spectrum::from_csv("spectrum_test/spec_to_csv_test_03.csv").is_err());
+        assert!(Spectrum::from_csv("spectrum_test/spec_to_csv_test_04.csv").is_err());
+    }
+    #[test]
+    fn range() {
+        let s = prep();
+        assert_eq!(
+            s.range(),
+            Length::new::<meter>(1.0)..Length::new::<meter>(3.5)
         )
-        .unwrap();
+    }
+    #[test]
+    fn estimate_resolution() {
+        assert_eq!(prep().average_resolution().get::<meter>(), 0.5);
+    }
+    #[test]
+    fn set_single_peak() {
+        let mut s = prep();
         assert_eq!(
-            s.set_single_peak(Length::new::<meter>(2.0), Energy::new::<joule>(1.0))
-                .is_ok(),
+            s.add_single_peak(Length::new::<meter>(2.0), 1.0).is_ok(),
             true
         );
-        assert_eq!(s.data[1].get::<joule>(), 1.0);
+        assert_eq!(s.data[2], 2.0);
     }
     #[test]
     fn set_single_peak_interpolated() {
-        let mut s = Spectrum::new(
-            Length::new::<meter>(1.0)..Length::new::<meter>(4.0),
-            Length::new::<meter>(1.0),
-        )
-        .unwrap();
+        let mut s = prep();
         assert_eq!(
-            s.set_single_peak(Length::new::<meter>(2.5), Energy::new::<joule>(1.0))
-                .is_ok(),
+            s.add_single_peak(Length::new::<meter>(2.25), 1.0).is_ok(),
             true
         );
-        assert_eq!(s.data[1].get::<joule>(), 0.5);
-        assert_eq!(s.data[2].get::<joule>(), 0.5);
+        assert_eq!(s.data[2], 1.0);
+        assert_eq!(s.data[3], 1.0);
+    }
+    #[test]
+    fn set_single_peak_additive() {
+        let mut s = prep();
+        s.add_single_peak(Length::new::<meter>(2.0), 1.0).unwrap();
+        s.add_single_peak(Length::new::<meter>(2.0), 1.0).unwrap();
+        assert_eq!(s.data[2], 4.0);
+    }
+    #[test]
+    fn set_single_peak_interp_additive() {
+        let mut s = prep();
+        s.add_single_peak(Length::new::<meter>(2.0), 1.0).unwrap();
+        s.add_single_peak(Length::new::<meter>(2.25), 1.0).unwrap();
+        assert_eq!(s.data[2], 3.0);
+        assert_eq!(s.data[3], 1.0);
     }
     #[test]
     fn set_single_peak_lower_bound() {
-        let mut s = Spectrum::new(
-            Length::new::<meter>(1.0)..Length::new::<meter>(4.0),
-            Length::new::<meter>(1.0),
-        )
-        .unwrap();
+        let mut s = prep();
         assert_eq!(
-            s.set_single_peak(Length::new::<meter>(1.0), Energy::new::<joule>(1.0))
-                .is_ok(),
+            s.add_single_peak(Length::new::<meter>(1.0), 1.0).is_ok(),
             true
         );
-        assert_eq!(s.data[0].get::<joule>(), 1.0);
+        assert_eq!(s.data[0], 2.0);
     }
     #[test]
-    fn set_single_peak_out_of_limit() {
-        let mut s = Spectrum::new(
-            Length::new::<meter>(1.0)..Length::new::<meter>(4.0),
-            Length::new::<meter>(1.0),
-        )
-        .unwrap();
-        assert_eq!(
-            s.set_single_peak(Length::new::<meter>(0.5), Energy::new::<joule>(1.0))
-                .is_ok(),
-            false
-        );
-        assert_eq!(
-            s.set_single_peak(Length::new::<meter>(4.0), Energy::new::<joule>(1.0))
-                .is_ok(),
-            false
-        );
+    fn set_single_peak_wrong_params() {
+        let mut s = prep();
+        assert!(s.add_single_peak(Length::new::<meter>(0.5), 1.0).is_err());
+        assert!(s.add_single_peak(Length::new::<meter>(4.0), 1.0).is_err());
+        assert!(s.add_single_peak(Length::new::<meter>(1.5), -1.0).is_err());
     }
     #[test]
-    fn set_single_peak_ngative_energy() {
+    fn add_lorentzian() {
         let mut s = Spectrum::new(
-            Length::new::<meter>(1.0)..Length::new::<meter>(4.0),
-            Length::new::<meter>(1.0),
+            Length::new::<meter>(1.0)..Length::new::<meter>(50.0),
+            Length::new::<meter>(0.1),
         )
         .unwrap();
-        assert_eq!(
-            s.set_single_peak(Length::new::<meter>(1.5), Energy::new::<joule>(-1.0))
-                .is_ok(),
-            false
-        );
+        assert!(s
+            .add_lorentzian_peak(Length::new::<meter>(25.0), Length::new::<meter>(0.5), 2.0)
+            .is_ok());
+        assert!(f64::abs(s.total_energy() - 2.0) < 0.1)
+    }
+    #[test]
+    fn add_lorentzian_wrong_params() {
+        let mut s = prep();
+        assert!(s
+            .add_lorentzian_peak(Length::new::<meter>(-5.0), Length::new::<meter>(0.5), 2.0)
+            .is_err());
+        assert!(s
+            .add_lorentzian_peak(Length::new::<meter>(2.0), Length::new::<meter>(-0.5), 2.0)
+            .is_err());
+        assert!(s
+            .add_lorentzian_peak(Length::new::<meter>(2.0), Length::new::<meter>(0.5), -2.0)
+            .is_err());
     }
     #[test]
     fn total_energy() {
+        let mut s = prep();
+        s.add_single_peak(Length::new::<meter>(2.0), 1.0).unwrap();
+        assert_eq!(s.total_energy(), 1.0);
+    }
+    #[test]
+    fn total_energy2() {
         let mut s = Spectrum::new(
             Length::new::<meter>(1.0)..Length::new::<meter>(4.0),
             Length::new::<meter>(1.0),
         )
         .unwrap();
-        s.set_single_peak(Length::new::<meter>(2.0), Energy::new::<joule>(1.0))
-            .unwrap();
-        assert_eq!(s.total_energy(), Energy::new::<joule>(1.0));
+        s.add_single_peak(Length::new::<meter>(1.5), 1.0).unwrap();
+        assert_eq!(s.total_energy(), 1.0);
     }
     #[test]
     fn scale_vertical() {
@@ -256,28 +684,147 @@ mod test {
             Length::new::<meter>(1.0),
         )
         .unwrap();
-        s.set_single_peak(Length::new::<meter>(2.5), Energy::new::<joule>(1.0))
-            .unwrap();
-        assert_eq!(s.scale_vertical(0.5).is_ok(), true);
-        assert_eq!(
-            s.data,
-            array![
-                Energy::zero(),
-                Energy::new::<joule>(0.25),
-                Energy::new::<joule>(0.25),
-                Energy::zero()
-            ]
-        );
+        s.add_single_peak(Length::new::<meter>(2.5), 1.0).unwrap();
+        assert!(s.scale_vertical(0.5).is_ok());
+        assert_eq!(s.data, array![0.0, 0.25, 0.25, 0.0]);
     }
     #[test]
     fn scale_vertical_negative() {
-        let mut s = Spectrum::new(
+        let mut s = prep();
+        assert!(s.scale_vertical(-0.5).is_err());
+    }
+    #[test]
+    fn calc_ratio_test() {
+        assert_eq!(calc_ratio(1.0, 2.0, 3.0, 4.0), 0.0); // bucket completely outside
+        assert_eq!(calc_ratio(1.0, 4.0, 2.0, 3.0), 1.0); // bucket contains source
+        assert_eq!(calc_ratio(2.0, 3.0, 0.0, 4.0), 0.25); // bucket is part of source
+        assert_eq!(calc_ratio(0.0, 1.0, 0.0, 2.0), 0.5); // bucket is part of source (matching left)
+        assert_eq!(calc_ratio(1.0, 2.0, 0.0, 2.0), 0.5); // bucket is part of source (matching right)
+        assert_eq!(calc_ratio(0.0, 2.0, 1.0, 3.0), 0.5); // bucket is left outside source
+        assert_eq!(calc_ratio(0.0, 2.0, 1.0, 2.0), 1.0); // bucket is left outside source (matching)
+        assert_eq!(calc_ratio(2.0, 4.0, 1.0, 3.0), 0.5); // bucket is right outside source
+        assert_eq!(calc_ratio(1.0, 4.0, 1.0, 3.0), 1.0); // bucket is right outside source (matching)
+        assert_eq!(calc_ratio(1.0, 2.0, 1.0, 2.0), 1.0); // bucket matches source
+    }
+    #[test]
+    fn resample() {
+        let mut s1 = Spectrum::new(
             Length::new::<meter>(1.0)..Length::new::<meter>(5.0),
             Length::new::<meter>(1.0),
         )
         .unwrap();
-        s.set_single_peak(Length::new::<meter>(2.5), Energy::new::<joule>(1.0))
-            .unwrap();
-        assert_eq!(s.scale_vertical(-0.5).is_ok(), false);
+        let mut s2 = Spectrum::new(
+            Length::new::<meter>(1.0)..Length::new::<meter>(5.0),
+            Length::new::<meter>(1.0),
+        )
+        .unwrap();
+        s2.add_single_peak(Length::new::<meter>(2.0), 1.0).unwrap();
+        s1.resample(&s2);
+        assert_eq!(s1.data, s2.data);
+        assert_eq!(s1.total_energy(), s2.total_energy());
+    }
+    #[test]
+    fn resample_delete_old_data() {
+        let mut s1 = Spectrum::new(
+            Length::new::<meter>(1.0)..Length::new::<meter>(5.0),
+            Length::new::<meter>(1.0),
+        )
+        .unwrap();
+        s1.add_single_peak(Length::new::<meter>(3.0), 1.0).unwrap();
+        let mut s2 = Spectrum::new(
+            Length::new::<meter>(1.0)..Length::new::<meter>(5.0),
+            Length::new::<meter>(1.0),
+        )
+        .unwrap();
+        s2.add_single_peak(Length::new::<meter>(2.0), 1.0).unwrap();
+        s1.resample(&s2);
+        assert_eq!(s1.data, s2.data);
+        assert_eq!(s1.total_energy(), s2.total_energy());
+    }
+    #[test]
+    fn resample_interp() {
+        let mut s1 = Spectrum::new(
+            Length::new::<meter>(1.0)..Length::new::<meter>(5.0),
+            Length::new::<meter>(0.5),
+        )
+        .unwrap();
+        let mut s2 = Spectrum::new(
+            Length::new::<meter>(1.0)..Length::new::<meter>(6.0),
+            Length::new::<meter>(1.0),
+        )
+        .unwrap();
+        s2.add_single_peak(Length::new::<meter>(2.0), 1.0).unwrap();
+        s1.resample(&s2);
+        assert_eq!(s1.data, array![0.0, 0.0, 1.0, 1.0, 0.0, 0.0, 0.0, 0.0]);
+        assert_eq!(s1.total_energy(), s2.total_energy());
+    }
+    #[test]
+    fn resample_interp2() {
+        let mut s1 = Spectrum::new(
+            Length::new::<meter>(1.0)..Length::new::<meter>(5.0),
+            Length::new::<meter>(1.0),
+        )
+        .unwrap();
+        let mut s2 = Spectrum::new(
+            Length::new::<meter>(1.0)..Length::new::<meter>(6.0),
+            Length::new::<meter>(0.5),
+        )
+        .unwrap();
+        s2.add_single_peak(Length::new::<meter>(2.0), 1.0).unwrap();
+        s1.resample(&s2);
+        assert_eq!(s1.data, array![0.0, 1.0, 0.0, 0.0]);
+        assert_eq!(s1.total_energy(), s2.total_energy());
+    }
+    #[test]
+    fn resample_right_outside() {
+        let mut s1 = Spectrum::new(
+            Length::new::<meter>(1.0)..Length::new::<meter>(4.0),
+            Length::new::<meter>(1.0),
+        )
+        .unwrap();
+        let mut s2 = Spectrum::new(
+            Length::new::<meter>(4.0)..Length::new::<meter>(6.0),
+            Length::new::<meter>(1.0),
+        )
+        .unwrap();
+        s2.add_single_peak(Length::new::<meter>(4.0), 1.0).unwrap();
+        s1.resample(&s2);
+        assert_eq!(s1.data, array![0.0, 0.0, 0.0]);
+        assert_eq!(s1.total_energy(), 0.0);
+    }
+    #[test]
+    fn resample_left_outside() {
+        let mut s1 = Spectrum::new(
+            Length::new::<meter>(4.0)..Length::new::<meter>(6.0),
+            Length::new::<meter>(1.0),
+        )
+        .unwrap();
+        let mut s2 = Spectrum::new(
+            Length::new::<meter>(1.0)..Length::new::<meter>(4.0),
+            Length::new::<meter>(1.0),
+        )
+        .unwrap();
+        s2.add_single_peak(Length::new::<meter>(2.0), 1.0).unwrap();
+        s1.resample(&s2);
+        assert_eq!(s1.data, array![0.0, 0.0]);
+        assert_eq!(s1.total_energy(), 0.0);
+    }
+    #[test]
+    fn add() {
+        let mut s = prep();
+        s.add_single_peak(Length::new::<meter>(1.75), 1.0).unwrap();
+        let mut s2 = prep();
+        s2.add_single_peak(Length::new::<meter>(2.25), 0.5).unwrap();
+        s.add(&s2);
+        assert_eq!(s.data, array![0.0, 1.0, 1.5, 0.5, 0.0, 0.0]);
+    }
+    #[test]
+    fn sub() {
+        let mut s = prep();
+        s.add_single_peak(Length::new::<meter>(1.75), 1.0).unwrap();
+        let mut s2 = prep();
+        s2.add_single_peak(Length::new::<meter>(2.25), 0.5).unwrap();
+        s.sub(&s2);
+        assert_eq!(s.data, array![0.0, 1.0, 0.5, 0.0, 0.0, 0.0]);
     }
 }