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偏振诱导信号衰落现象的抑制是干涉型光纤传感系统的关键技术之一.针对法拉第旋镜(FRM)法抑制偏振诱导信号衰落技术的残留偏振相位噪声问题进行了深入的理论和实验研究.运用琼斯矩阵法建立了基于法拉第旋镜的干涉型光纤传感系统偏振相位噪声的理论模型;分析了影响系统偏振相位噪声的主要原因:法拉第旋镜的旋光角度偏差、入射光偏振态调制度、干涉仪两臂光纤双折射;提出了相应的抑制偏振相位噪声的方法.详细仿真分析了入射光偏振态调制度对干涉型光纤传感系统偏振相位噪声的影响,仿真分析得出若法拉第旋镜旋光角度偏差为最大工艺制造误差1°,当入射光偏振态调制度为1.84 rad时,系统可能出现的最大偏振相位噪声为0.0815 rad.最后,搭建了基于M-Z型偏振态调制器的偏振相位噪声测试系统,测试了在传输光纤受到外界偏振扰动的情况下,干涉传感系统存在的偏振相位噪声,实验测试结果与理论分析结果基本一致,有力地证明了该偏振相位噪声理论分析模型的正确性.
The suppression of polarization-induced signal fading is one of the key technologies of the interferometric optical fiber sensing system.An in-depth theoretical and experimental study is carried out on the residual polarization phase noise of the FRF method for suppressing polarization-induced signal fading The Jones matrix method is used to establish the theoretical model of the polarization phase noise of the Faraday-based interferometric fiber-optic sensing system. The main causes of the phase-polarization of the system polarization are analyzed: the angular deviation of the Faraday rotator, the polarization degree of the incident light, the interference The paper puts forward the corresponding methods to suppress the phase noise of the polarization.The influence of the degree of polarization of the incident light on the polarization phase noise of the interferometric optical fiber sensing system is simulated in detail.The simulation results show that if the Faraday rotation When the polarization degree of incident light is 1.84 rad, the maximum possible phase noise of the system is 0.0815 rad. Finally, a polarization phase noise test based on MZ polarization modulator is set up System to test for interference sensing in the case of transmitting optical fibers subjected to external polarization disturbances Polarization phase noise present in the system, consistent with experimental test results of theoretical analysis, strong evidence of the correctness of the analysis model polarization phase noise theory.