Optical link performance calculator based on the Polynomial Closed-Form GN/EGN model (PCFM) The main file is Matlab, the others are mostly MEX files, compiled for Windows/Intel systems and for Linux systems. The software is capable of fully characterizing the GSNR of each channel of a multi-band, multi-span link, in the presence of ISRS and Raman amplification (both forward and backward). Version 1.1: the graphical output of the provided use-case example has been improved. More information is provided, including a breakdown of NLI into SCI and XCI. A dialog lets you choose which span output, of the provided 10-span example of a C+L+S systems, you are interested in. Version 1.2: several new system examples have been added. Now the full suite of examples include: a 1000 km C+L+S system with Raman amplification optimized for throughput (same as in Version 1.1) a 1000 km C+L+S system with Raman amplification optimized for throughput and GSNR flatness (new) a 3000 km C+L system with Raman amplification optimized for throughput (new) a 3000 km C+L system with Raman amplification optimized for throughput and for GSNR flatness (new) a 7000 km C-band system optimized for throughput (new) Version 2.0: The SCI (single-channel interference, or SPM) computing module has been entirely re-written to enable operation at lower dispersion and lower symbol rates than before. Double Rayleigh Back-scattering (DRB) has been added to all system configurations. It is now a component of the GSNR which shows up in the GSNR plots. In Raman-amplified systems it may be important (see for instance the system example “CLS_1000km_max_throughput”). ASE from all Raman effects (both amplification with pumps and ISRS) is taken into account. The software now checks for too-low values of dispersion and too-low symbol rates.If either or both of these conditions are detected: |β2| < 1 ps^2/km (or approximately |D| < 0.8 ps/(nm km)) at any frequency in the WDM band the symbol rate of any channel in the system is below 7 GBaud then the program stops and warns you about it.