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We provide Python tools enabling numerical simulation and analysis of thepropagation dynamics of ultrashort laser pulses in nonlinear waveguides. Themodeling approach is based on the widely used generalized nonlinearSchr\"odinger equation for the pulse envelope. The presented softwareimplements the effects of linear dispersion, pulse self-steepening, and theRaman effect. The focus lies on the implementation of input pulse shot noise,i.e. classical background fields that mimick quantum noise, which are often notthoroughly presented in the scientific literature. We discuss and implementcommonly adopted quantum noise models based on pure spectral phase noise, aswell as Gaussian noise. Coherence properties of the resulting spectra can becalculated. We demonstrate the functionality of the software by reproducingresults for a supercontinuum generation process in a photonic crystal fiber,documented in the scientific literature. The presented Python tools are areopen-source and released under the MIT license in a publicly available softwarerepository.

A generalized nonlinear Schr\"odinger Python module implementing different models of input pulse quantum noise