中文摘要：

在低双折射光纤中，利用线偏振光满足的包含拉曼效应的非线性耦合模传输方程，通过引入斯托克斯参量，导出了斯托克斯参量所满足的耦合模传输方程．利用庞加莱球图示法，描述了拉曼增益效应作用下光波偏振态的演化，研究分析了拉曼效应对低双折射光纤中光波偏振态演化规律的影响．结果表明，当输入功率与运动常量满足一定关系时，拉曼增益效应改变了光波传输时其偏振态演化周期和偏振态的椭圆率．

英文摘要：

In this paper, the linear polarization light satisfied nonlinear coupled differential equations containing the Raman effect are utilized in a low birefringence fiber. The coupling model equation satisfied by the Stokes parameters is derived by introducing the Stokes parameters. Poincaré sphere is used to analyze the influence of Raman scattering effect on the state of polarization evolution in the low-birefringence fiber. The results show that the state of polarization evolution can be changed and the polarization ellipticity can also be changed due to Raman scattering effect in the low birefringence fiber when between the input power and motion constants satisfy a certain relation.