We apply a 3 rd -order inverse Volterra series nonlinear equalizer to a 400 Gb/s WDM multiband PM-16QAM OFDM signal. IVSTF-NLE provides a 0.6 dB Q-factor improvement and 1 dB nonlinear threshold increase compared to linear equalization.
The results of the comparison study, between the well-known digital backpropagation nonlinear compensation method and the 3rd-order inverse Volterra series transfer function nonlinear equalizer, reveal the physical limits of the nonlinear equalizers when high bit rates are transmitted in long-haul optical communication systems, in the presence of increased nonlinear effects. In addition, the computational complexity and, by extension, the cost, introduced by each equalizer, are taken into account. The insight gained from this study could be valuable in the foreseeable future in order to indicate the nonlinear compensation method of choice for the next generation inter-data centers supporting bit rates as high as 400 Gb/s.
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