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Publication Detail
The Gaussian Noise Model in the Presence of Inter-channel Stimulated Raman Scattering
CCBY A Gaussian noise (GN) model, precisely accounting for an arbitrary frequency dependent signal power profile along a fiber span, is presented. This allows accurate evaluation of the impact of inter-channel stimulated Raman scattering (ISRS) on the optical Kerr nonlinearity. ISRS is a non-parameteric nonlinear effect that transfers power from high to low frequency components within the same optical signal. Additionally, the frequency- dependent fiber attenuation can be taken into account and transmission systems that use hybrid amplification schemes can be modeled, where distributed Raman amplification is partly applied over the optical spectrum. For the latter two cases, a set of coupled ordinary differential equations must be numerically solved to obtain the signal power profile and the resulting nonlinear perturbation. However, for lumped amplification and negligible varying fiber attenuation, ISRS and passive loss determine the signal power evolution of each frequency component. For this case, a full analytical model is presented, denoted as the ISRS GN model. The derived model is shown to be exact to first-order for Gaussian modulated signals and extensively validated by numerical split-step simulations. A maximum deviation of only < formula > < tex > $0.1$ < /tex > < /formula > ~dB in nonlinear interference power between simulations and the ISRS GN model was observed. The ISRS GN model is quantitatively compared with other models published in the literature and found to be significantly more accurate.
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