Abstract
We study the polarization mode dispersion (PMD) compensation performance of different modulation formats. Firstly, we analyze the relationship between the signal's degree of polarization (DOP) and differential group delay (DGD) of different modulation formats. The results show that the differential phase-shift keyed (DPSK) modulation formats are more suitable for PMD compensation system than the ON-OFF keying (OOK) modulation formats because the DOP-DGD curves of DPSK signals are monotonic and it is easy to search the global maximum. Secondly, we study the PMD compensation performance of the mentioned modulation formats with DOP as feedback signal. It is shown that the modulation formats with smaller bandwidth have better PMD compensation performance, and that PMD compensation performance of DPSK formats are better than that of OOK formats. CSRZDPSK combines the carrier-suppressed characteristic of CSRZ format and specific spectrum characteristic of DPSK format, thereby it has the best performance of PMD compensation.
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