Abstract
In this paper, we consider a fractionally spaced equalizer (FSE) for electronic compensation of chromatic
dispersion (CD) and polarization-mode dispersion (PMD) in a dually polarized (polarization-multiplexed) coherent
optical communications system. Our results show that the FSE can compensate any arbitrary amount of CD and
first-order PMD distortion, provided that the oversampling rate is at least 3/2 and that a sufficient number of
equalizer taps are used. In contrast, the amount of CD and PMD that can be corrected by a symbol-rate equalizer only
approaches an asymptotic limit, and increasing the number of taps has no effect on performance due to aliasing that
causes signal cancellation and noise enhancement.
© 2007 IEEE
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