Dynamic adaptive PMD compensation in a 40Gb/s OTDM system

The Ninth International Conference onCommunications Systems, 2004. ICCS 2004. Pub Date : 2004-11-30 DOI:10.1109/ICCS.2004.1359436

Li Tang-jun, Wang Muguang, Jian Shuisheng, Lou Caiyun, Huo Li, Yao Hejun, Ning Tigang, Diao Cao, Gong Xiangfeng, Fu Yongjun, Tang Zhongwei, Liu Yan

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Abstract

An experiment of two-stages four degrees high-order polarization mode dispersion (PMD) compensation in 40 Gb/s optical communication system with a large PMD is reported. The former stage adopts polarization controller and fixed time-delayed line of polarization-maintaining fiber (PMF). The second stage consists of a polarization rotator and a tunable differential group delay (DGD) line that is based on magneto optical crystal. The second stage is used to compensate remnant first-order PMD. The PMD monitoring technique adopted degree of polarization (DOP) as error signal. A novel practical adaptive optimization algorithm was introduced in dynamic adaptive PMD compensation. Some experimental results show that large PMD is compensated by this compensator in a 40 Gbits/s non-return-to-zero (NRZ) OTDM transmission systems. A significant improvement of system performance can be achieved in the eye pattern of a received signal. Most first-order compensating ability of the compensator is 35 ps. Second-order compensating ability of the compensator is 200 ps2 . The optimum compensating time is within several milliseconds

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40Gb/s OTDM系统的动态自适应PMD补偿

报道了在40gb /s大偏振模色散补偿系统中两级四度高阶偏振模色散补偿的实验。前级采用偏振控制器和保偏光纤固定延时线;第二级由极化旋转器和基于磁光晶体的可调谐差分群延迟线组成。第二级用于补偿残余的一阶PMD。PMD监测技术采用偏振度(DOP)作为误差信号。在动态自适应PMD补偿中引入了一种新颖实用的自适应优化算法。实验结果表明，在40gbps非归零(NRZ) OTDM传输系统中，该补偿器可以补偿较大的PMD。在接收信号的眼模式中可以实现系统性能的显著改进。补偿器的一阶补偿能力最大可达35ps，二阶补偿能力最大可达200ps2。最佳补偿时间在几毫秒内

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The Ninth International Conference onCommunications Systems, 2004. ICCS 2004.

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