An Improved Model of Nonlinear Fiber Propagation in the Presence of Kerr Nonlinearity and Stimulated Raman Scattering

Hami Rabbani, Gabriele Liga, Vinicius Oliari, Lotfollah Beygi, Erik Agrell, Magnus Karlsson, Alex Alvarado

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Abstract

Ultra-wideband fiber optical transmission suffers from nonlinear interference (NLI) noise caused by both Kerr nonlinerity and stimulated Raman scattering (SRS). Mathematical models that address the interplay between Kerr nonlinearity and SRS exist. Most of these models are based on the Gaussian-noise (GN) model which is based on the assumption that the transmitted signal, after transmission on a dispersive fiber, is Gaussian. Similarly to the case where SRS is not present or neglected, these models overestimate the NLI power. This problem can be partially solved by adding modulation format-dependent correction terms. In this paper, we introduce a general model that accounts for both Kerr nonlinearity and SRS, accounting for all terms of nonlinear interactions, including self-channel interference, cross-channel interference, and multi-channel interference. The model lifts the Gaussianity assumption and can handle different modulation formats over different wavelength channels, different symbol rates, multi-span systems with different fibers, and hybrid amplification schemes. Numerical results indicate that when both SRS and arbitrary modulation formats are considered, previous models may inaccurately predict the NLI power. This difference could be up to 4.3 dB for a 10.011 THz system with 1001 channels at 10 Gbaud. Split-step Fourier simulations support our analytical results.

Title version 2 : A General Analytical Model of Nonlinear Fiber Propagation in the Presence of Kerr Nonlinearity and Stimulated Raman Scattering
Original languageEnglish
Article number1909.08714
Number of pages23
JournalarXiv
Volume2020
Publication statusPublished - 18 Sep 2019

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