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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 37,
  • Issue 3,
  • pp. 989-999
  • (2019)

Nonlinear Performance of Few-Mode Fiber Links With Intermediate Coupling

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Abstract

This paper reviews and extends the study of nonlinear performance of few-mode fiber links operating in all different linear coupling regimes for different mode delay maps. Nonlinear performance was estimated using the four-wave-mixing theory and the split-step Fourier method including semi-analytical solutions for linear mode coupling of arbitrary strength. The optimum link configurations minimizing the nonlinear penalty at practical levels of training sequence length are presented, including the required coupling strength to give nonlinear distortion below that of the single-mode propagation without mode coupling, and the impact of mode delay maps. Finally, different approximate solution methods of the multimode nonlinear Schrödinger equation are compared, highlighting the accuracy of a stochastic solution method including distributed linear mode coupling.

© 2018 IEEE

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