光纤偏振模色散对信号偏振度的影响

采用一种简化的线路传输模型，详细讨论了在高速光纤通信系统中，线路偏振模色散（PMD ），尤其是二阶PMD、输入信号偏振态等对信号偏振度（DOP）的影响，并指出以信号DOP做 反馈控制信号适合于一阶PMD优化补偿系统，但在较大二阶PMD的影响下，将增加控制算法的 复杂性，使系统可能陷入局部最优解. 关键词： 信号偏振度 偏振模色散 信号偏振态

Impact on the signal degree of polarization due to polarization mode dispersion in optical fibres

Using a compact optical link transmission model, the degradation of signal degree of polarization (DOP) induced by polarization mode dispersion (PMD), especially the second-order PMD, and the input signal state of polarization in high-speed optical fibre communication systems is studied in detail. It is pointed out that the signal DOP can be used as the feedback control signal in the optical adaptive first-order PMD optimal compensation systems compatibly. However, if the second-order PMD is considered, the control algorithm will be complicated, and there will be the possibility that the system is trapped in a local optimum which would downgrade compensator the performance.