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Characterizing Nonlinearities in IM-DD Links via the Best Linear Approximation: Distortion Analysis and Modulation Optimization

Sebastian Fraga Fernández, Leonardo Minelli, Fernando de Bernardinis, Felipe Villenas, Yunus Can Gültekin, Alex Alvarado

arXiv:2608.11754Published August 12, 20260 citations
  • eess.SP
  • cs.IT

Abstract

We use the best linear approximation (BLA) to characterize nonlinearities in IM-DD links. The orthogonal nonlinear distortion is shown to be non-Gaussian. The BLA is used to approximate the optimum modulation depth for different equalizer structures.

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