借鉴线偏干涉型光纤陀螺系统的理论方法,分析了圆偏振光陀螺系统的光源偏振度、传感环中的耦合点、反射点以及轴对不准所带来的误差对系统的影响。理论研究表明,在线偏振系统中易于造成偏振误差的反射点和轴对不准,在圆偏振系统下不再导致系统偏振误差;而由于圆偏振光陀螺系统中耦合偏振误差随损耗系数呈指数变化,故选择高性能的单圆偏振保持光纤对于减小偏振误差至关重要。 In this paper, the theoretical method of line-of-sight interferometric fiber optic gyroscope is used to analyze the influence of the error of the light source polarization degree, the coupling point and the reflection point in the ring, and the misalignment of the axis on the system. Theoretical studies show that the point of reflection and the axis of the line polarization system which are easy to cause polarization error are not allowed, and the system polarization error is no longer caused under the circular polarization system. However, due to the exponential change of the coupling polarization error in the circularly polarized light gyro system with the loss coefficient , Choosing a high-performance single-circular polarization-maintaining fiber is crucial for reducing polarization errors.