10 Gb/s光纤通信系统一阶偏振模色散动态补偿系统反馈控制的实现

在偏振模色散(PMD)自动补偿技术中,如何根据反馈信号得到相应的控制信号,使补偿速度跟随偏振模色散变化始终是该技术的一个核心问题。提出了一种新颖的自适应抖动跟踪算法,完成了以微波信号为反馈的多自由度的一阶偏振模色散自动反馈补偿系统的跟踪补偿实验。算法成功地解决了传统算法在跟踪搜索过程中易陷入局部极值的问题,有效地克服了系统中的重要控制器件偏振控制器的磁滞现象以及动态补偿时跟踪搜索过程中易出现的瞬间恶化现象。实验结果表明该算法在对出现突发偏振模色散扰动后自动进行补偿的响应速度在ms量级,最快能达到1~2 ms。

Adaptive Feedback Controlling of the First-Order Polarization Mode Dispersion Compensation System for the 10 Gb/s Optical Fiber Communication System

How to get the corresponding control signal according to the feedback information and respond timely are the key problems for the polarization mode dispersion(PMD) adaptive compensation technique.An adaptive PMD compensation experiment for 10 Gb/s fiber optical system is completed by using a multi-degree of freedom compensator with the power of specific frequency component in the signal spectrum as the feedback signal,with a novel adaptive tracking algorithm.The novel algorithm successfully solves the problem of trapping into local optima,efficiently eliminates the hysteresis of polarization controller(PC) and is adopted in the tracking course with no visible worsening of the feedback signal in the adaptive tracking compensation process.The long term testing with multi-times disturbances shows that the response time for the compensator to recover from a sudden disturbance is at the level of milliseconds.