Abstract
The impact of chromatic dispersion (CD) and initial chirp on the degree of polarization (DOP) feedback signal in polarization-mode dispersion (PMD) compensation is analyzed. Initial chirp affects DOP only in the presence of CD. The DOP distortion increases not only with the change of signal width due to CD and initial chirp, but also with the system bit rate. It degrades PMD compensation only if the same optimized DOP threshold (less than one) is chosen whenever with or without CD and initial chirp, and presents a weak effect on PMD compensation with the improvement of DOP threshold. Modifications to the degradation of PMD compensation are proposed finally according to the simulations of signal DOP properties in actual 10- and 40-Gb/s systems.
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