多波长抽运C+L波段喇曼放大器的数值模拟与分析

摘要

为了合理地设计出宽带分布式光纤喇曼放大器系统,采用理论分析与数值模拟相结合的方法,对前向抽运方式的喇曼耦合方程进行数值仿真,获得了合适的抽运源波长,从而实现了分布式喇曼光纤放大器的带宽为80nm(1530nm～1610nm).在抽运功率均匀分配的情况下,对80个信道的信号进行分布式放大,分析了不同信号、抽运功率沿光纤的分布,以及输出端不同信道信号功率、增益分布特性.为了改善信号、增益平坦度,通过调整抽运功率获得了较好的增益平坦,信号经50km的G652单模光纤传输后,平均增益约为10dB,增益平坦度为1dB.该结果对于分布式宽带光纤喇曼放大器的研制有着重要的指导作用.%In order to design a broadband distributed fiber Raman amplifier, after simulating the forward pumping mode Raman coupling equations, proper wavelengths were obtained, and it was found that the bandwidth was 80nm at 1530nm 1610nm for a distributed Raman fiber amplifier. Under the condition of uniform pump, after amplifying the signals in 80 signal channels, the signal and pump power along the fiber, the output power and gain of each channel were analyzed. The pumping power was adjusted to improve signal and gain flatness. After transmitting in a G6S5 single mode fiber in 50km long, the average gain was, about 1OdB, and the gain flatness was 1dB. This result plays important instructive role in the design of broadband distributed fiber Raman amplifiers.