宽带喇曼/EDFA混合放大器的优化设计

采用改进的模拟退火算法对Raman/EDFA混合放大器的增益谱进行了优化，根据EDFA及Raman的功率传播方程获得了简洁的目标函数.通过对模拟退火算法几个优化环节的改进，使其能够更快速地应用于Raman/EDFA的多峰值问题的优化设计，可以在短时间内获得最优的放大器参量.计算结果表明选择合适的喇曼抽运波长和抽运功率，仅用4个反向抽运的分布式喇曼放大器加C波段的EDFA就可以获得C+L波段约70 nm的带宽、开关增益达到15 dB、最大增益波动小于1.2 dB的平坦增益谱，而且无需额外的平坦滤波器.

Optimal Design for Broad-band Raman/EDFA Hybrid Amplifier

A novel method was proposed to optimize Raman/EDFA hybrid amplifiers based on an improved simulated annealing algorithm (ISAA) in this paper,and a simple object function was achieved according to power-coupled equations of erbium doped fiber Amplifier (EDFA) and fiber Raman Amplifier (FRA).The proposed ISAA can effectively solve the multimodal optimization including both global and local optima in the hybrid amplifier.Optimization results show that,under the conditions of the ON-OFF gain of 15 dB,an amplifier bandwidth at about 70 nm and the maximum gain ripple less than 1.2 dB have been achieved with 4 pumps by using the optimization of the ISAA.Comparing with other existing methods,the ISAA can attain a required low gain ripples and larger bandwidth without any gain flatten filter.