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Optica Publishing Group
  • Journal of Lightwave Technology
  • Vol. 39,
  • Issue 4,
  • pp. 1020-1026
  • (2021)

Digital Back Propagation via Sub-Band Processing in Spatial Multiplexing Systems

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Abstract

An advanced digital backward-propagation (DBP) method using a separate-channels approach (SCA) is investigated for the compensation of inter-channel nonlinearities in spatial- and wavelength-multiplexed systems. Compared to the conventional DBP, intra-, and inter-mode cross-phase modulation can be efficiently compensated by including the effect of the inter-channel walk-off in the nonlinear step of the split-step Fourier method. We found that the SCA-DBP relaxes the step size requirements by a factor of 10, while improving performance by 0.8 dB for large walk-off and strong linear coupling. For the first time, it is shown that in spatial multiplexed systems transmission performance can be improved by sub-band processing of back propagated channels.

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