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应用于动态通信网络中的光放大器需要恒定的信号增益。为此,设计了一个基于环形激光腔结构的宽带铋基掺铒光纤放大器(Bi-EDFA),进行了宽带Bi-EDFA信号增益箝制特性的理论研究。结果表明:通过将放大器输出的一个前向放大自发辐射(ASE)噪声光反馈到输入端,可以实现对1.53μm波段传输信号的增益箝制。环路损耗越小,放大器的输出增益越小,但实现增益箝制的信号输入功率动态范围越大。同时,在多路CWDM信号传输情形下,可以在下载一些信道的同时,很好地保持剩余信道的增益稳定。研究结果对于新型宽带Bi-EDFA的实际应用具有理论指导意义。
Optical amplifiers used in dynamic communication networks require a constant signal gain. For this reason, a broadband bismuth-based erbium-doped fiber amplifier (Bi-EDFA) based on a ring laser cavity is designed, and the theoretical study on the gain-clamping characteristics of broadband Bi-EDFA signal is carried out. The results show that the gain clipping of the transmitted signal in the 1.53μm band can be achieved by feeding back a forward amplified spontaneous emission (ASE) noise light from the amplifier to the input. The smaller the loop loss, the smaller the output gain of the amplifier, but the greater the dynamic range of the signal input power for gain clamping. At the same time, in the case of multiple CWDM signal transmission, it is possible to keep the gain of the remaining channels stable while some channels are being downloaded. The research results are of theoretical significance for the practical application of the new broadband Bi-EDFA.