拉曼抽运下的布里渊-瑞利散射研究

首先对色散补偿光纤中不同拉曼抽运功率下的布里渊-瑞利散射 现象进行实验研究，详细分析和说明了输出光谱特性以及输出光谱随抽运功率的演化特性.然后在已有的一级布里渊散射的理论模型基础上，进一步推导出拉曼抽运下多级布里渊-瑞利散射的理论模型.利用该模型进行了数值模拟，结果表明：在抽运功率较低的情况下，理论和实验相符；但在抽运功率较高的情况下，理论和实验存在较大差异.对于差异 的形成，也进行了深入的分析. 最后，从理论计算和实验结果两方面，得到较高抽 运功率下的多级布里渊-瑞利散射的饱和特性，进而说明了特定抽运功 关键词： 布里渊 瑞利散射 拉曼抽运 多级理论模型 饱和特性 多级平坦输出光谱

Study on Brillouin-Rayleigh scattering under Raman pump

We have experimentally studied the Brillouin-Rayleigh scat tering in dispersion compensation fibers under Raman pump of different po we rs, and analyzed the characteristics of output spectra and the variation of th e spectra with pump power in detail. Then, based on the known theoretical model of the first-order stimulated Brillouin scattering, we deduce the theoretica l model for multi-order Brillouin-Rayleigh scattering. By this model, we have ma de numerical simulation, and the results show that theory and experiment are consiste nt at lower pump power, but have great differences at higher pump power.Moreove r, we analyze carefully the differences between theory and experiment. Finally,from theoretical calculation and experimental results, we obtain the saturation charac teristics of Brillouin-Rayleigh scattering at higher pump power, so that we can easily explain the cause of flat multi-order Brillouin-Rayleigh scattering at a certain higher Raman pump power.