受激布里渊散射光纤陀螺中光偏振度的研究

考虑了光纤耦合的一次效应,从Ｊｏｎｅｓ矩阵理论出发,利用统计平均的方法推导出在受激布里渊散射光纤陀螺敏感环光纤熔接处进行了θ偏振主轴旋转的光纤敏感环中传输光的偏振度表达式,说明偏振度ｐ与θ及偏振光入射角θｐ的关系以及与光纤段之比ｎ的关系,得出当ｎ＝１,θ＝９０°时传输光在敏感环中具有最大偏振度,使传输光达到稳定的偏振特性。

Study on the Polarization D egree of the Sensing Coil in the Stimulated Brillouin Scattering Fiberopt ic Gyroscope

Considering the first effect of fiber coupling and started from the theory of Jones matrix,we deduce the expression of the polarization degree p,which reflects the polarization characteristic of the transmitting light in the sensing coil of the stimulated brillouin scattering fiberoptic gyroscope,by the method of statistics and average. The relationship between polarization degree and rotating angle at the splice,the relationship between polarization degree the angle of the incidence of the polarized light in the sensing coil and the relationship between polarization degree and the ratio of two fiber lengths are analyzed. The results show that the polarization degree gets the maximum when n is 1 and is 90,which assures the polarization stability of the transmitting light.