Optimum Length of One-Stage Polarization-Mode-Dispersion Compensator with Fixed Delay Line

We investigate the performance of a one-stage polarization-mode dispersion (PMD) compensator with fixed delay line. We find that there exists an optimum delay line length for the PMD compensator and the optimum length depends on signal bandwidth. We show that the PMD compensator with fixed delay line can achieve almost the same performance as the PMD compensator with variable delay line if the optimum length is used.