铌酸锂偏振编码器的偏振稳定性研究

偏振编码器的稳定性是影响偏振编码通信的关键因素之一。采用时变矢量对基于铌酸锂(LN)相位调制的偏振编码器的稳定性进行了深入研究。实验表明，LN的偏振相关损耗主态(PPL)与偏振相关相移主态基本一致，说明LN的偏振相关损耗不会影响偏振态的稳定性。实验中观察到偏振态旋转具有“惯性”：使电压从0增加到某个定值，在停止增加后，偏振态会继续变化一段时间，大约在30 min后才达到稳定；相反，使电压从某个定值减少为0，在停止减少后，偏振态仍会继续变化一段时间。该现象对于低速调制将带来不利影响；对于高速调制，平均功率的变化也将引起偏振抖动。

Abstract

The stability of the polarization encoder is one of the key issues affecting polarization coding communication. The stability of the polarization encoder based on lithium niobate (LN) phase modulator is studied in depth, and is described by time variant vector. The experiment results show that, for the LN phase modulator, the principal state of polarization-dependent loss (PDL) is consistent with the principal state of polarization-dependent phase shift, indicating that PDL can not affect the stability of the polarization state. A “inertia” of polarization rotation is observed in experiment. On the one hand, increasing voltage from 0 to a value, after stopping the increase of voltage, the polarization state can not be stable before about 30 min; on the other hand, decreasing voltage from a value to 0, after stopping the decrease of voltage, the polarization state can not be stable before several minutes too. It can have negative effects on low-speed modulation. For high-speed modulation, the changes of the average power can cause polarization jitter.

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