In order to increase the dynamically adaptive compensation capability of polarization mode dispersion(PMD) compensation system,a novel feedback control algorithm is proposed to adjust the PMD compensation unit dynamically,in which the particle swarm optimization(PSO) algorithm is used as the searching algorithm and the improved simplex method(ISM) as the tracking algorithm.The immune clone principle is introduced into the standard particle swarm optimization(PSO) algorithm to increase the global optimizatio...