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分别设计了一个带光隔离器和一个带光环形器的复合型宽带铋基掺铒光纤放大器(Bi-EDFA),理论上研究了Bi-EDFA中对于后向传输放大自发辐射(ASE)的处理对放大器性能的影响。研究表明,在C+L波段多波长信号同时输入情形下,通过在铋基掺铒光纤中插入一个光隔离器抑制后向传输的ASE,可以提高放大器各波长信号增益,降低噪声系数。利用一个光环形器引导后向传输的ASE去泵浦一段未抽运的低掺杂铋基掺铒光纤,可以显著地提高放大器长波段信号增益,而噪声系数只是略有增加,理论研究与报道的实验结果达到了比较好的一致。研究结果对于新型宽带Bi-EDFA的设计和应用具有一定实际指导意义。
A composite broadband bismuth-based erbium-doped fiber amplifier (Bi-EDFA) with an optical isolator and an optical circulator was designed respectively. In theory, the processing of amplified spontaneous emission (ASE) in Bi-EDFA was studied Effect on amplifier performance. The results show that by adding an optical isolator in the bismuth-based erbium-doped fiber to suppress ASE in the C + L-band multi-wavelength signal input simultaneously, the signal gain of each wavelength of the amplifier can be increased and the noise figure can be reduced. The use of an optical circulator to guide the backward transmission of ASE to pump an undepressed low-doped bismuth-based erbium-doped fiber can significantly increase the long-band gain of the amplifier signal, while the noise figure is only slightly increased. Theoretical studies and reports The experimental results reached a better consensus. The research results are of practical significance for the design and application of the new broadband Bi-EDFA.