光纤陀螺的光路偏振噪声的理论分析

An Analysis of the Optical Path′s Polarization Noise of Fiber Gyroscopes

采用相干矩阵和琼斯矩阵建立了光纤陀螺光路传输系统的数学模型 ,在此基础上 ,进行了光路偏振噪声的理论分析。分析表明非偏振光输入可以抑制陀螺偏振噪声 ,同时得出了线偏振光输入时抑制偏振噪声的措施。

Zero drift and polarization noise are the main two hindrances in the development of fiber gyroscopes in China. We have dealt with zero drift in Ref.[1]. In this paper, we present our results in the analysis of polarization noise. In section 1, we first established the mathematical model(eq.1) of the optical transmission system(Fig.1) by using coherence matrix and Jones matrix. Based on the above mentioned model, we analyzed the optical path′s polarization noise. Figs.3 through 6 show the variation of polarization noise φ ε) with the input intensity ( ｜S A｜ ), the extinction rate ( η ), the total polarization rotation (θ) , the change in ellipticity of the input state of polarization (ξ) and the reciprocal phase shift of the fiber (φ) . We proposed three measures for restraining polarization noise in section 3.