谐振式光纤陀螺(R-FOG)中, 偏振波动引起的检测信号漂移对陀螺系统的检测精度有重要影响。通过矩阵法, 分析系统中光纤耦合器不同偏振本征态(ESOPs)的耦合系数差异, 与所引起的系统零偏的关系, 得到其与两个偏振本征态耦合系数以及光纤环形谐振腔参数间的解析表达式。利用该解析表达式, 求解系统零偏为极值时, 耦合器不同偏振本征态的最佳耦合系数；该最佳耦合系数仅与光纤环形谐振腔的损耗参数有关。通过Matlab软件进行数值拟合, 得到不同偏振本征态耦合系数与系统零偏之间的关系曲线。从理论上建立耦合器耦合系数偏振相关引起的噪声模型。利用该理论模型, 对已报道的R-FOG开环实验系统中偏振波动引起的系统零偏进行了估算。

In the resonator fiber-optic gyro (R-FOG), the detection precision of the system is influenced by the polarization-fluctuation deeply. Using the Jones matrix, the relationship between the drift caused by the polarization-fluctuation and the difference in the coupling ratios of the two eigenstates of polarization (ESOPs) is derived. To make the drift margin, the optimized coupling ratios of the two ESOPs are gotten. These optimized coupling ratios are only related to the loss parameters of the resonator in R-FOG. By the numerical simulation in Matlab, the curves between the drift and the coupling ratios of the two ESOPs are attained, respectively. The polarization-fluctuation error model about the correlation between the coupling ratios of the two ESOPs is set up. Based on the theoretical model above, the drift induced by the polarization-fluctuation is estimated in the reported open-loop experiment of R-FOG. It’s the theoretical base to overcome the polarization-fluctuation and do the experiments in R-FOG system.