谐振式光纤陀螺环形谐振腔的偏振问题

张旭琳; 周柯江

中国激光, 2009, 36 (8): 2083, 网络出版: 2009-08-13

谐振式光纤陀螺环形谐振腔的偏振问题

Polarization-Fluctuation in Resonator of Resonator Fiber-Optic Gyro

论文大纲

张旭琳 ^1,*周柯江 ²

作者单位

¹ 深圳大学电子科学与技术学院, 深圳市微纳光子信息技术重点实验室, 广东深圳 518060

² 浙江大学信息与电子工程系, 浙江杭州 310027

传感器谐振式光纤陀螺偏振本征态偏振波动零偏 sensors resonator fiber-optic gyro eigenstate of polarization polarization-fluctuation drift

摘要

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。

Abstract

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.

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张旭琳, 周柯江. 谐振式光纤陀螺环形谐振腔的偏振问题[J]. 中国激光, 2009, 36(8): 2083. Zhang Xulin, Zhou Kejiang. Polarization-Fluctuation in Resonator of Resonator Fiber-Optic Gyro[J]. Chinese Journal of Lasers, 2009, 36(8): 2083.

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