L波段掺铒光纤放大器的自发辐射谱与增益的研究

Research on Amplified Spontaneous Emission and Gain of L-Band EDFA

利用Giles模型对L波段掺铒光纤放大器小信号增益特性进行了数值模拟 ,模拟结果表明最佳铒纤长度并不是一定值 ,它随输入信号波长的不同而改变 ,较短的波长对应较短的光纤长度 ;在数值模拟、分析的基础上 ,分别采用 7m和 9m的L波段铒光纤构成长波段掺铒光纤放大器 ,通过实验测量 ,分析比较了它们的自发辐射谱以及增益和噪声指数 ,得到了光纤长度对L波段增益谱、噪声指数和自发辐射谱的影响规律 ;最后 ,辅以C波段掺铒光纤放大器加以分析 ,指出了适合于放大L波段信号的最佳自发辐射谱型。

Gain characteristics of small signal in L-band Erbium-doped fiber amplifier (EDFA) are analyzed with the numerical simulation using Giles model. The results show that the optimal fiber length varies with input signal wavelength, in general, shorter wavelength demands shorter fiber length. 7 m and 9 m L-band EDF are employed to construct L-band EDFAs respectively. Evaluation of EDFAs is made by experimental comparision of their amplified spontaneous emission (ASE) spectr, gains and noise figures (NF), and the results show that the fiber length is crucial for proper gain characteristic. On the basis of these numerical, experimental study and also considering their C-band characteristics, optimal ASE spectrum related to the best behavior of L-band signal amplification is presented.