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In this paper, we present a novel closed-form model (CFM) for accurate andfast evaluation of nonlinear interference in modern ultrawideband coherentoptical fiber communication systems. Starting from the Gaussian noise model (GNmodel), using reasonable approximations and machine-learning optimizedimprovements, we achieve an accurate CFM capable of handling ultrawide band(C+L or wider) optical fiber systems in the presence of Inter-channelStimulated Raman Scattering (ISRS) and forward-pumped Raman amplification.

A Real-Time Closed-Form Model for Nonlinearity Modeling in  Ultra-Wide-Band Optical Fiber Links Accounting for Inter-channel Stimulated  Raman Scattering and Co-Propagating Raman Amplification