组合光纤光栅掺铒光纤放大增益平坦器研究  

Gain-Flattening Erbium Doped Fiber Amplifier Based Composite Fiber Gratings

作　　者：布音嘎日迪[1] 张甲笑 潘赫赫 柳春郁[1] 杨九如[1] 

机构地区：[1]黑龙江大学黑龙江省普通高等学校电子工程重点实验室,黑龙江哈尔滨150080 [2]黑龙江大学电子工程学院,黑龙江哈尔滨150080

出　　处：《光学学报》2014年第B12期45-51,共7页Acta Optica Sinica

基　　金：国家自然科学基金（61302075）、中国博士后基金资助（2012M520779）

摘　　要：相比与L波段，掺铒光纤放大器（EDFA）在C波段的增益谱平坦必须借助光学滤波器实现。由于带宽非适配，传统的长周期光纤光栅（LPFG）无法有效压缩增益起伏。为改善EDFA的增益平坦度，将LPFG与弱反射率光纤布拉格光栅对（FBG-P）结合构成组合光栅增益平坦器，利用FBG-P的弱谐振特性进一步抑制EDFA的增益谱起伏。通过仿真分析优化了相关重要参数，并实验测试了对应方案的增益平坦特性。数值结果表明，所提方案将EDFA在1520～1560 nm区域内的增益起伏限制在±0.45 dB，与单LPFG结构相比，增益平坦改善达49.31%。Compared with L band, the gain flattening of erbium doped fiber amplifier （EDFA） in C band should be conducted by optical filter. Due to unmatched bandwidth, the conventional long-period fiber grating （LPFG） cannot efficiently reduce the fluctuation of gain spectrum. Aiming to improve gain flatness of EDFA, a novel scheme named composite fiber grating is proposed which combining LPFG and fiber Bragg grating-pair （FBG-P） with weak reflectivity. Moreover, the key parameters of CFG are optimized by simulation, and its performance of gain flattening is also experimentally tested. The numerical results show that, the proposed scheme achieves controlling the fluctuation within ±0.45 dB in the range from 1520 nm to 1560 nm, and the improvement on gain flattening reaches 49.31% comparing with the scheme based single LPFG.

关 键 词：光纤光学 掺铒光纤放大器 增益平坦 长周期光纤光栅 光纤布拉格光栅 

分 类 号：TN913.7[电子电信—通信与信息系统]