光源光谱对干涉式光纤陀螺零漂的影响

以采用Y波导集成光学调制器的保偏型干涉式光纤陀螺(IFOG,Interference Fiber Optic Gyroscopes)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.首次借助光源偏振度的改变,分析了不同形状的光源光谱对偏振模式耦合误差引起的陀螺零漂的影响.通过计算得出,当光源的偏振度在0~3%之间呈线性变化以及光路中其它参数不变时,谱宽较窄的光谱引起的零漂较大,谱宽较宽的光谱引起的零漂较小.仿真结果给光纤陀螺光源光谱的选择提供了理论依据.

Influence of source spectrum on bias stability of interference fiber optic gyroscopes

The Jones matrixes and mathematical model for the optical transmission of IFOG(interference fiber optic gyroscopes) were built based on the polarization IFOG, which uses Y waveguide integrated optical modulator, and depended on the parameters of the optical instruments. The polarization errors were analyzed theoretically, and the expressions of the polarization errors of IFOG were achieved. The influence of different source spectra on the bias stability of IFOG, caused by the polarization errors, was analyzed for the first time with the aid of source degree of polarization. By calculation, when the source degree of polarization changes linearly between 0~3% and other parameters are constants, the result that the narrower the spectrum, the larger the bias stability caused by the polarization errors is achieved. Simulation results give theoretical reference to the selection of source spectra for the IFOG.