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相位漂移一直是相干光通信系统实施过程中需克服的关键问题之一。在弄清了该问题的根本原因后,给出了一个自动补偿算法,用于减轻相位漂移对光链路中传输的光脉冲所产生的不利影响。基于理论研究和实验分析,用先进的硬件技术实现了自动补偿模块,并将其集成到早起搭建的相干光通信系统中。相比于之前相位随机抖动的情况,目前相位可被完全补偿。实验结果显示,当采用了笔者提出的为原始数据周期性地添加同步和训练序列的方法后,才可计算反馈信号,该反馈信号输入到相位调制器的控制输入端来稳定光脉冲的相位,并使得接收端的数据采集和恢复成为可能。
Phase shift has always been one of the key issues to be overcome in the implementation of coherent optical communication systems. Having figured out the root cause of the problem, an automatic compensation algorithm is presented to mitigate the adverse effects of phase shifts on the optical pulses transmitted in the optical link. Based on theoretical research and experimental analysis, the automatic compensation module is realized with advanced hardware technology and integrated into the coherent optical communication system which is built up early. The current phase can be completely compensated compared to the case of random jitter in the previous phase. The experimental results show that the feedback signal can be calculated only when the method proposed by the author for periodically adding synchronization and training sequences to the original data is used. The feedback signal is input to the control input of the phase modulator to stabilize the phase of the optical pulse, And makes it possible for the receiving end to collect and recover data.