为了实现信号光在光纤链路上的准无损传输, 采用在光纤两端对称注入1阶和2阶喇曼抽运的高阶喇曼放大方法, 对该结构下的光纤准无损传输系统建立了理论仿真模型, 并对该系统进行了仿真优化, 研究了在不同的1阶和2阶抽运功率组合方案下, 系统总功率消耗和信号沿光纤功率平坦度的变化, 以及信号光功率和光纤长度对系统性能指标的影响。结果表明, 采用过高功率(大于1mW)的入射信号光, 会恶化系统整体性能; 当光纤的长度过长时(大于60km),系统的平坦度指标恶化明显。采用该方案能实现60km的准无损传输, 并且可以通过系统所需能耗和信号平坦度的实际需求, 设计出不同的抽运功率组合方案。

In order to realize quasi lossless transmission of signal light on optical fiber link, by using high-order Raman amplification method of injecting the first order and the second order Raman pumping into both ends of fiber symmetrically, the numerical model of fiber optical quasi-lossless transmission system was built and the opmization of the system was carried out. The total power consumption and signal power variation with different pump power combinations of the first order and the second order Raman pump were investigated. The influence of signal power and fiber length on system performance index was studied. The results indicate that, system performance will be worse when signal power is higher than 1mW. And system flatness will be worse obviously when fiber length is longer than 60km. Quasi-lossless transmission can be realized along 60km fiber by utilizing this scheme and different pumping power combination schemes can be designed according to the actual demand of energy consumption and signal flatness.