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在采用直接解复用的偏分复用(PDM)系统中,反馈信号是决定系统解复用性能的关键因素,因此反馈信号的选取与正确建模至关重要。本文详细分析了两偏振态信号光相干性对基于光功率差和射频(RF)功率两种直接解复用反馈信号的影响,完善了相关的理论模型,建立了100Gbit/s的PDM-DQPSK传输系统仿真平台,对两种反馈信号的解复用效果进行了验证。结果表明,无论两偏振态信号光的相干性如何,基于光功率差的反馈信号都适用,而RF功率反馈信号只适用于信号光相干度较大的情况;在两种反馈信号均可以使用的情况下,它们的解复用效果基本相同,引入的光功率代价均约为0.1dB。
In PDM systems using direct demultiplexing, the feedback signal is the key factor that determines the demultiplexing performance of the system, so the choice of the feedback signal is crucial to correct modeling. In this paper, the influence of the optical coherence of two polarization signals on two direct demultiplexing feedback signals based on optical power difference and radio frequency (RF) power is analyzed in detail. The relevant theoretical models are improved and a 100Gbit / s PDM-DQPSK transmission is established The system simulation platform verifies the demultiplexing effects of the two feedback signals. The results show that the feedback signal based on the difference of optical power is suitable regardless of the coherence of the two polarized light signals and the RF power feedback signal is only applicable to the situation that the signal light coherence is large. Case, their demultiplexing effect is basically the same, the introduction of optical power costs are about 0.1dB.