偏振模色散已成为当前发展高速长距离光纤传输系统的主要限制因素。理论上分析了光纤一阶偏振膜色散效应对高速伪随机非归零码/归零码光信号偏振度的影响,并利用数值模拟的方法分析了信号不同输入偏振态以及高阶偏振膜色散效应对非归零码光信号偏振度的影响。最后对利用信号偏振度作为反馈控制信号的自适应偏振膜色散补偿系统的补偿性能进行了分析,大量统计分析结果表明对于10 Gbit/s的非归零码光纤传输系统,当传输线路的平均偏振膜色散值小于43 ps时,利用极大化输出信号偏振度的偏振膜色散补偿系统对信号眼图的补偿概率可以达到99.99%。

PMD has been the major limiting factor for long haul high bitrate optical fiber transmission. The relationship between 1st order PMD and optical signal DOP (degree of polarization) of PRBS NRZ/RZ is discussed in theory, and the impacts of different input states of polarization and higher-order PMD on signal DOP of NRZ/RZ are analyzed by numerical simulations. Then, Monte-Carlo simulations are performed with all order PMD model on the statistics of PMD compensator, which uses signal DOP as the feedback control signal in the 10 Gbit/s NRZ optical transmission system. The statistical simulation results indicate that the compensation probability for the signal eye-diagrams can reach 99.99% when the average DGD of the link is below 43 ps.