Research on PMD compensation in high-speed optical fiber communication network

In order to overcome imperfections in manufacturing process, mechanical stress or temperature which can cause birefringence with difference in the phase and group velocities of the two orthogonal polarized modes, a new adaptive polarization mode dispersion (PMD) compensation method in 80 Gbit/s optical communication is proposed. In the experiment of this paper, through the control of digital signal processor (DSP), the dithering particle swarm optimization (PSO) algorithm is used to extract the best degree of polarization (DOP), the DOP is utilized to compensate three stage PMD of optical fiber. The experiment results show that the high speed polarization monitoring unit seriously decreases the polarization monitoring time for adaptive PMD compensation and makes the PMD compensation system work effectively.