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偏振模色散效应严重制约着长距离高速光纤通信的发展,偏振模色散的自适应补偿成为光通信领域研究的焦点。利用两阶段偏振模色散补偿器,采用6个自由度的粒子群优化算法(PSO),通过在线监测搜索光纤链路信号的偏振度极值作为反馈控制信息,在40 Gb/s归零码高速光纤传输链路中成功实现了 ms量级的偏振模色散自适应补偿。补偿前后采用庞加莱球法测量光纤链路中偏振模色散量,测量结果表明在信号中心波长1560.5 nm处,差分群时延补偿前后测量值分别为21 ps和1.3 ps,而二阶偏振模色散补偿前后测量值分别为266 ps2 和43.5 ps2。补偿后实验链路中的一阶和二阶的偏振模色散同时得到不同程度的补偿,并且系统的总的功率代价在误码率为10-9时小于1 dB。
Polarization mode dispersion effect seriously restricts the development of long-distance high-speed optical fiber communication. The adaptive compensation of polarization mode dispersion becomes the focus of research in the field of optical communication. A two-stage polarization mode dispersion compensator (PSO) is used to detect the polarization degree of optical fiber link signals as the feedback control information by using six-degree-of-freedom particle swarm optimization (PSO) Optical transmission link in the successful realization of ms magnitude of polarization-mode dispersion adaptive compensation. Before and after compensation, the Poincaré method was used to measure the polarization mode dispersion in the optical fiber link. The measurement results show that the measured values before and after differential group delay compensation are 21 ps and 1.3 ps respectively at the signal center wavelength of 1560.5 nm, while the second- Before and after dispersion compensation measurements were 266 ps2 and 43.5 ps2. The compensated first-order and second-order polarization mode dispersion in the experimental link are compensated to some extent at the same time, and the total power penalty of the system is less than 1 dB when the bit error rate is 10-9.