自适应偏振模色散补偿系统中的控制算法

为了实现对偏振模色散（PMD）效应所造成系统性能损伤的动态有效补偿，通过对PMD补偿方式的简要分析，给出了一种以电域特定频率分量功率作为控制信号的PMD光域自适应补偿实验系统. 在此基础上，对单纯形算法、遗传算法、粒子群算法等3种常用优化算法的基本思想和特点进行了分析比较，并分别采用3种算法对一阶PMD及二阶PMD进行补偿，得到了补偿后的信号偏振度（DOP）和信号眼图．实验结果表明，粒子群算法更加适合作为PMD光域自适应补偿系统的控制算法．

Control Algorithms in Adaptive PMD Compensation System

To compensate the effect of polarization mode dispersion(PMD) in fiber-optic transmission systems efficiently and automatically,an automatic compensation experimental system is proposed which uses certain electrical frequency component as control signal.On this foundation,the principles and characteristics of the three optimization algorithms,simplex algorithm,genetic algorithm and particle swarm algorithm,were analyzed and compared.Then these control algorithms were separately adopted not only to compensate first-order PMD alone,but also to compensate both first-order PMD and second-order PMD together.Consequently,the distribution of degree of polarization(DOP) and eye graphs were obtained.The experimental results showed that the particle swarm optimization algorithm is preferable in adaptive PMD compensation system.