Comparison of different feedback signals for one-stage polarization-mode dispersion compensators

The performance of a one-stage polarization-mode dispersion (PMD) compensator with different feedback signals is studied and compared with that of a pure first-order PMD compensator. We show that the performance of the one-stage PMD compensator has a strong dependence on feedback signals, and that the efficiency of some feedback signals depends on modulation formats. 

With proper choice of feedback signals, the one-stage PMD compensator can achieve better performance than the first-order PMD compensator.