宽带FRA中同时实现信号增益与噪声平坦的快速算法

宽带FRA中同时实现信号增益与噪声平坦的快速算法 Fast Algorithm to Optimize Simultaneously Signal Gain and Noise Spectra of Broadband Fiber Raman Amplifier 周莉 ZHOU Li~ 1 2 3 4 5 first-author 闻传花 1 2 3 4 5 武汉通信指挥学院六系二十一队 武汉通信指挥学院六系二十一队 1,2),WEN Chuan-hua~ 1,2),WEN Chuan-hua~ 解放军理工大学通信工程学院,湖北,武汉,430010 解放军理工大学通信工程学院,湖北,武汉,430010 武汉通信指挥学院二系信息作战实验室 武汉通信指挥学院二系信息作战实验室 ,重庆,400035 ,重庆,400035 解放军重庆通信学院卫星通信教研室 解放军重庆通信学院卫星通信教研室 首先优化了多波抽运拉曼光纤放大器的功率耦合方程,并利用小信号方法解决反向抽运的边值问题,其次采用遗传算法同时实现了信号增益谱和噪声谱的平坦.计算表明:双向抽运方式下系统噪声谱在C+L波段（1.53 1 .61μm）比反向抽运更为平坦;抽运光数目与增益平坦度呈非线性关系并存在下限值.通过多次测试,对于10波抽运,100信道的DWDM系统（带宽为80 nm）,增益波动小于1 dB的优化时间可控制在400 s以内. Firstly,a simple method is proposed to optimize the coupling differential equation of multiwave pumped fiber Raman amplifier and to solve the boundary problem of backward pump based on small signal theory.Secondly,a genetic algorithm is used to approach the flatness of signal gain and noise spectra simultaneously.The calculated results show that spectra of noise is flatter under the case of bidirectional pump than backward pump in C and L wave band.Nonlinearity relationship is found between number of pump waves and relative flatness of signal gain and the number of pump waves has lowest bounds.A fiber Raman amplifier pumped by 10-wavelength source is optimized and the gain ripple less than 1 dB in 100-channel DWDM system of 80 nm gain spectra is obtained within 400 s through many tests. 拉曼光纤放大器 增益波动 噪声平坦 遗传算法 抽运配置 fiber Raman amplifier gain ripple noise flatness genetic algorithm pump scheme TN722 2005-01-01 2021-04-01 S2