高速光纤通信系统中高阶PMD补偿技术研究

A study on the compensation of PMD in high speed optical communication system

随着光放大器和色度色散补偿技术的不断提高 ,光纤的偏振模色散 ( PMD)已经成为超高速、超长距离光纤通信系统发展的主要障碍 .在 40 Gbit/s或更高速率的光纤通信系统中 ,PMD的影响已不可忽略 ,必须考虑 PMD的补偿问题 .从高阶 PMD对 40 Gbit/s NRZ系统影响的数值模拟发现 ,当光纤中 PMD高阶效应比较明显时 ,将严重劣化一阶 PMD补偿的效果 .另外 ,通过对两种高阶 PMD补偿器的比较介绍 ,认为两段级联的高阶

When attenuation and chromatic dispersion are compensated for, polarization mode dispersion (PMD) in optical fibers is regarded as one of the dominant obstacles in optical communication systems having bit rates of 40 Gbit/s and beyond and transmission distance of several thousand kilometers. From the simulation of second order PMD in 40 Gbit/s NRZ optical communication system, we found that high order PMD in optical fibers can degrade the 1st order compensation effect severely. In this paper, we also introduce two high order PMD compensators on the basis of PMD vector and Jones matrix respectively and the two staged higher order PMD compensator using a fixed differential group delay (DGD) section followed by a variable section is preferred.