4 × 10 Gb/s OTDM 系统中偏振模色散自适应补偿的研究

Using the degree of polarization as feedback signal to detect the polarization mode dispersion (PMD) variation in the fiber links, an experiment of dynamic adaptive PMD compensation in 4 × 10 Gb/s optical time-division multiplexed (OTDM) transmission system is reported. The PMD compensator consists of a polarization controller and a variable delay line with four degrees of freedom. Based on the variable step-size peek search algorithm, the performance of the PMD compensator is assessed in the eye pattern of a received signal. It is shown that the maximum compensated differential group delay is 25 ps, i.e. one bit period, and the compensation time can be less than 50 ms. © 2005 Chinese Physical Society.