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对40 Gb/s光纤通信中归零码和非归零码光脉冲的偏振度随二阶偏振模色散的变化规律进行了数值模拟,结果表明由于二阶偏振模色散的影响,偏振度的变化趋势呈现出震荡性,二阶偏振模色散对归零码的偏振度要比非归零码的偏振度影响明显;同时搭建了偏振模色散补偿系统,对系统进行数值模拟和实验所得到的结果都表明,以偏振度作为反馈信号,采用粒子群优化算法作搜索算法能够有效地对归零码和非归零码系统的一阶及高阶偏振模色散进行自适应补偿。
The polarization degree of zero and non-return zero optical pulses in 40 Gb / s optical fiber is numerically simulated with the second order mode dispersion. The results show that the variation of polarization degree due to the second-order polarization mode dispersion The tendency of oscillation appears oscillatory. The polarization degree of the second-order polarization mode dispersion has a significant effect on the degree of polarization of the return-to-zero code than that of the non-return-to-zero code. Meanwhile, a polarization mode dispersion compensation system is established. The numerical simulation and experimental results Both of them show that the particle swarm optimization algorithm can effectively compensate the first-order and high-order polarization mode dispersion of the zero-return and non-return-to-zero systems by using the polarization degree as the feedback signal.