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以Y波导集成光学调制器保偏型干涉式光纤陀螺作为研究对象,根据各光学元器件的参数建立了各器件的琼斯矩阵以及光路传输模型,在此基础上进行了光路偏振误差的理论分析。通过推导,得到了保偏型干涉式光纤陀螺的偏振误差表达式,并首次分析了光源偏振度对光纤陀螺零漂的影响。借助光源尾纤输出的光谱,对由0%~3%之间呈线性变化的偏振度以及对经实验测试的光源偏振度的实际值引起的偏振模式耦合误差的零漂值进行了仿真计算。结果表明,当光路中其它参数不变时,由光源偏振度变化引起的零漂值为0.001°/h,满足了高精度光纤陀螺的精度要求。
Y waveguide integrated optical modulator polarization-maintaining interferometric fiber optic gyroscope was taken as the research object. According to the parameters of each optical component, the Jones matrix and the optical transmission model of each device were established, and the theoretical analysis of optical path polarization error was carried out. Through the derivation, the polarization error expression of the polarization maintaining fiber optic gyroscope is obtained, and the effect of the polarization degree of the light source on the zero drift of the fiber optic gyroscope is analyzed for the first time. The zero-drift of the polarization mode coupling error caused by the linearly varying degree of polarization between 0% and 3% and the experimental value of the actual polarization degree of the light source was calculated by the spectrum of light source pigtail output. The results show that when the other parameters in the optical path are unchanged, the zero drift value caused by the change of polarization degree of the light source is 0.001 ° / h, which meets the precision requirement of high precision fiber optic gyroscope.