消偏光纤陀螺偏振串扰误差分析及实验研究

Analysis of Depolarized Fiber Optical Gyro′s Polarization Crosstalk Error and Experimental Research

以琼斯矩阵为基础,建立了双消偏光纤陀螺(DFOG)系统的光路传输模型,推导出偏振串扰误差的理论表达式。仿真分析了消偏器的45°角误差,偏振串扰点功率耦合,Y波导有限消光比以及环内偏振旋转角对消偏光纤系统偏振串扰误差的影响。实验验证了两消偏器45°角之间的相对偏差以及温度对陀螺零漂的影响。结果表明,两消偏器45°角之间的相对偏差越大、温度梯度越大,对陀螺精度的影响越大。

Based on the Jones matrix, the optical transmission model of dual depolarized fiber optical gyros （DFOGs） is built and the theoretical expression of polarization crosstalk error is derived. The effect of the polarization crosstalk error caused by the 45° angle error of depolarizer, the power coupling of polarization crosstalk point, the limited Y waveguide chip extinction ratio and the angle of polarization rotation of the fiber coil on DFOG are simulated and analyzed. Experiments demonstrate the effect of 45° angle relative error between two depolarizers and temperature on DFOG zero drift. Results show that the greater the 45° angle relative error between two depolarizers changes and the higher temperature gradient is, the greater influence on the precision of DFOG will become.