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

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4 Author(s)
Savory, S.J. ; UCL Electron. & Electr. Eng. Dept., Univ. Coll. London, London, UK ; Gavioli, G. ; Torrengo, E. ; Poggiolini, P.

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:

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

Date of Publication:

May15, 2010

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