Abstract
Based on bit-error-ratio simulations, we investigate electrical-dispersion-compensation performance by using a
nonlinear electrical equalizer based on nonlinear Volterra theory for different modulation formats. This nonlinear
equalizer is compared to conventional decision-feedback equalizer as well as to maximum-likelihood sequence
estimation. Especially, we show that nonlinear equalizers, in conjunction with narrowband optical filtering of the
light signal, result in improved performance. First of all, the system can benefit from the noise reduction due to
narrowband filtering. Second, interacting with chromatic dispersion, nonlinear equalizers benefit from the improved
dispersion tolerance through spectrum reshaping by narrowband optical filtering. Finally, nonlinear equalizers can
efficiently mitigate the distortion resulting from strong optical filtering.
© 2007 IEEE
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