We propose a practical shaping algorithm for mitigating the effect of nonlinear phase-noise in fiber-optic transmission. The proposed scheme is most beneficial in single-span fiber communications systems of the kind considered for inter-datacenter communications. In such systems the correlation time of the nonlinear phase-noise is too short to allow the mitigation of nonlinear phase-noise by means of adaptive phase-recovery or equalization, but long enough for a shaping approach to be effective. We rely on the implementation of the shell mapping method, optimized so as to provide the largest sum of linear and nonlinear shaping gains.Index Terms-Optical communications, shell mapping, optimal shaping, fiber nonlinearity, nonlinear interference noise (NLIN).
0733-8724 (c)
We demonstrate mitigation of inter-channel nonlinear interference noise (NLIN) in WDM systems for several amplification schemes. Using a practical decision directed recursive least-squares algorithm, we take advantage of the temporal correlations of NLIN to achieve a notable improvement in system performance.
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