拉曼效应对低双折射光纤的偏振态演化分析

在准连续情况下, 通过求解低双折射光纤中含有拉曼效应的右旋与左旋圆偏振光所满足的耦合非线性薛定谔方程, 得到了归一化功率以及相位差的解析解. 利用解析解，推导出了椭圆率和方位角的表达式, 研究了拉曼效应和传输距离对偏振态演化的影响, 并用相平面法对椭圆率和方位角随着输入功率的变化进行了直观描述. 结果表明: 低双折射光纤在传输的过程中, 拉曼效应和传输距离都是影响其偏振态稳定性的因素, 均改变了椭圆率和方位角的演变周期以及振荡幅度.

Raman effect on the evolution of polarization in law-birefringence fiber

In low birefringence fiber, by solving the coupled nonlinear Schrodinger equations containing the Raman effect for satisfying right- and left-handed circularly polarized light in the quasi-CW case, the normalized power and the phase difference analytic solutions have been obtained. Using the analytic solutions, the expressions of ellipticity and azimuth angle have been deduced and the influences of Raman effect and the transmission distance on the polarization state evolution have been researched, the relationships of ellipticity and azimuth angle with input power were described by using the phase plane method. The results show that the Raman effect and the transmission distance are the main factors that affect the stability of polarization, the polarization state evolution cycles of ellipticity and azimuth angle can be changed and the oscillation amplitude also can be changed for the low birefringence fiber in the transmission process.