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Impact of Interchannel Nonlinearities on a Split-Step Intrachannel Nonlinear Equalizer

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4 Author(s)
Seb J. Savory ; Optical Networks Group, UCL Electronic and Electrical Engineering Department, University College London, London, UK ; Giancarlo Gavioli ; Enrico Torrengo ; Pierluigi Poggiolini

We experimentally investigate the use of split-step intrachannel nonlinear equalizer, for a wavelength-division-multiplexed (WDM) 112-Gb/s nonreturn-to-zero polarization-division-multiplexed quadri-phase-shift keying system using a digital coherent receiver. Our investigations demonstrate that the nonlinear compensation algorithm can increase the reach by 23% in a 100-GHz spacing WDM link compared to 46% for the single-channel case. When the channel spacing is reduced to 50 GHz, the reach improvement is minimal due to the uncompensated interchannel nonlinearities; nevertheless, the system robustness is improved as the system operating power dynamic range is widened by 2 dB.

Published in:

IEEE Photonics Technology Letters  (Volume:22 ,  Issue: 10 )