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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。
In PMD automatic compensation technology, how to obtain the corresponding control signal according to the feedback signal and make the compensation speed follow the change of PMD is always a core issue in this technology. A novel adaptive dither tracking algorithm is proposed and the tracking compensation experiment of the first order polarization mode dispersion automatic feedback compensation system with multi-degree-of-freedom feedbacked by the microwave signal is completed. The algorithm successfully solves the problem that the traditional algorithm is easy to fall into the local extremum in the tracking search process and effectively overcomes the hysteresis phenomenon of the polarization controller of the important control device in the system and the transient deterioration prone to occur in the tracking search process when the dynamic compensation is performed phenomenon. The experimental results show that the proposed algorithm can automatically compensate for sudden polarization-mode dispersion disturbances in the order of milliseconds, and the fastest one can achieve 1 ~ 2 ms.