采用遗传算法对Raman+EDFA混合放大器的增益谱进行了优化，根据二能级近似的EDFA模型及Raman功率耦合方程获得了简洁的适应度函数形式，可以在短时间内获得最优的放大器参数。计算表明，通过选择合适的拉曼抽运波长和抽运功率以及EDFA的平均反转度，仅用三个抽运源反向抽运的分布拉曼放大器加C-EDFA就可以获得在1542～1602 nm共60 nm带宽上最大增益波动小于1 dB的平坦增益谱而无需额外的平坦滤波器。并对混合放大器的设计进行了讨论。

A novel method is proposed to optimize EDFA+ Raman hybrid amplifiers based on genetic algorithm in this paper, and a simple fitness function is achieved according to Giles two-level approximation equations and Raman power-coupled equations. The calculated results show that a flat gain profile from 1542 to 1602 nm, with a maximum gain ripple less than 1 dB can be obtained without any gain flatten filter, by using only three Raman pump diodes with proper power and wavelength. And some useful design principles are discussed.