多波长宽带拉曼放大器的优化设计  

Optimal Design of a Multi-wavelength Broadband Raman Amplifier

作　　者：常建华[1] 王婷婷[1] 陶在红[1] 张明德[2] 

机构地区：[1]南京信息工程大学电子与信息工程学院,江苏南京210044 [2]东南大学电子工程系,江苏南京210096

出　　处：《计算物理》2007年第2期227-233,共7页Chinese Journal of Computational Physics

基　　金：南京信息工程大学科研基金(QD60)资助项目

摘　　要：简化多波长宽带拉曼放大器功率耦合方程,利用多步平均功率法进行数值计算得到密集波分复用系统信号的合成拉曼增益.对传统的模拟退火优化算法进行改进,并应用于宽带拉曼放大器增益谱的优化设计.提出新的目标函数,综合考虑增益带宽、开关增益、增益平坦度等特征参数.基于该简化模型和优化方法研究多泵浦光源的个数、输入功率和波长分布对信号拉曼增益的影响,揭示拉曼放大器增益带宽、开关增益、增益平坦度、泵浦数目等主要参数之间的内在联系.仿真结果显示,信号平坦增益带宽Δλ随着泵浦数的增多显著加宽,随开关增益的提高和平坦度的增加明显变窄.Power coupled equations for a multi-wavelength broadband Raman amplifier （MBRA） are reasonably simplified. A multi-step average power method is used to compute composite Raman gain of multi-signal in a dense wavelength division multiplexed system （DWDM）. A conventional simulated annealing algorithm is applied for optimization of MBRA. A simple object function is proposed considering the gain bandwidth, on-off gain, gain flatness and other characteristic parameters. Influences of the number of pump, input power and wavelength distribution on Raman gain are studied. Relations among gain bandwidth, on-off gain, gain flatness and the number of pump of MBRA are revealed. Simulation shows that the optimal signal bandwidth △λ becomes boarder with the increasing of the number of pump and narrower with the increasing of Raman gain and the improvement of flatness.

关 键 词：宽带拉曼放大器 模拟退火算法 增益平坦度 

分 类 号：TN929.11[电子电信—通信与信息系统]