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Digital Equalization of Chromatic Dispersion and Polarization Mode Dispersion

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2 Author(s)
Ip, E. ; Stanford Univ., Stanford ; Kahn, J.M.

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.

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Lightwave Technology, Journal of  (Volume:25 ,  Issue: 8 )