基于粒子群优化算法的双向多泵浦光纤拉曼放大器增益研究

Study on gain of bidirectional multi-pump fiber Raman amplifier

基于石英光纤作为增益介质,采用龙格-库塔法、打靶法求解多波长双向泵浦光纤拉曼放大器的功率耦合波方程,得到拉曼放大器的增益带宽,平均增益,增益平坦度以及泵浦光和信号光沿光纤的分布。再通过粒子群优化算法对同一数量泵浦光不同排列双向系统进行逐个优化分析,在14种双向泵浦结构中选出性能较优的三种结构,再对它们优化参数设置,最终得到性能最优的双向泵浦结构BBFF。研究结果表明:在仅有四个泵浦光的情况下,双向多泵浦结构BBFF具有最优的平均增益和增益平坦度,并且得到了开关增益为23.1665 dB,增益平坦度为0.794 dB的双向泵浦结构。

Based on quartz fiber as gain medium,the power coupling wave equation of multi-wavelength bidirectional pump Raman fiber amplifier is solved by Runge-Kutta method and shooting method,and the gain bandwidth,average gain,gain flatness and the distribution of pump light and signal light along the fiber are obtained.Then the particle swarm optimization algorithm is used to optimize the two-way system with the same number of pumping light and different arrangement.Three kinds of structures with better performance are selected from 14 kinds of bidirectional pump structures,and then the parameters are optimized.Finally,the bidirectional pump structure BBFF with the best performance is obtained.The results show that when there are only four pumping lights,the bidirectional multi-pump structure BBFF has the optimal average gain and gain flatness,and the bidirectional pump structure with switching gain of 23.1665 dB and gain flatness of 0.794 dB is obtained.