基于双向二级喇曼抽运的偏振控制研究

为了发展具有实用价值的受激喇曼全光偏振控制方法，根据光纤中受激喇曼散射矢量理论和光纤随机双折射效应设计了基于双向二级喇曼抽运的全光偏振控制方案，构建了偏振吸引理论模型，采用严格数值迭代算法对该偏振控制方案进行了仿真分析，并完成了偏振控制方案最佳工作性能的优化设计。结果表明，当信号光波长为1550nm、功率为0.1mW、一级抽运光和二级抽运光的功率分别为1W和4W、其偏振态都为（0，1，0）、光纤长度为3km时，信号光偏振度可达0.85以上，且信号光强度波动低于35%。该方案有效降低了作用光波功率、减弱了信号光输出强度噪声，并提高了信号光输出偏振度。

Rerearch of polarization control based on bi-propagating dual-order Raman pump

In order to develop a practical all-optical polarization control tool, according to vector stimulated Raman scattering theory and random birefringence effect of optical fibers, a scheme of all-optical polarization control was proposed based on bi-propagating dual-order Raman pump. After the establishment of the theoretical model solved by rigorous numerical method, the optimal design of the polarization control scheme was completed. The results show that when signal wavelength is 1550nm, signal power is 0. 1mW, pump light P1 and P2 power are 1W and 4W, and their polarization states are (0, 1, 0), fiber length is 3km, the degree of polarization of signal light could be more than 0. 85, and the intensity fluctuations of signal light are less than 35%. The proposed method is effective to reduce the power of the interacting light wave, weaken the intensity noise of output optical signal and improve the degree of polarization of optical signals.