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基于光纤放大器增益谱的宽带平坦化发展需要,设计了一个两段铋基掺铒光纤(Bi-EDF)级联并携带一个C波段(1 530~1 565 nm)宽带光纤布拉格光栅(FBG)的双通结构型铋基掺铒光纤放大器(Bi-EDFA),从理论上研究了其对输入信号的放大特性。研究表明:FBG的引入可以使C和L波段(1 570~1 620 nm)信号分别经历不同长度Bi-EDF的双向传输,各自获得高增益放大,实现增益谱的宽带平坦化。在200 mW的1 480 nm双向对称泵浦下,第一级和第二级Bi-EDF长度分别为50 cm和170 cm时,对于波长间隔为2 nm、每路功率为-30 dBm的56路C+L波段信号的输入,Bi-EDFA高于30 dB的增益带宽达到了90 nm(1 530~1 620 nm),平均增益为35.7 dB,增益起伏仅为2.3 dB。同时,噪声系数得到明显改善。研究结果对于研制具有宽带、增益平坦的C+L波段Bi-EDFA具有实际指导意义。
Based on the requirement of wideband planarization for the gain spectrum of fiber amplifier, a two-pass Bi-EDF cascaded dual wideband fiber Bragg grating (FBG) with a C band (1 530 ~ 1 565 nm) Structural bismuth-based erbium-doped fiber amplifier (Bi-EDFA), from the theoretical study of the amplification of the input signal characteristics. The results show that the introduction of FBG can make the C and L band (1 570 ~ 1 620 nm) signals undergo bi-directional transmission of Bi-EDF with different lengths, respectively, gaining high-gain amplification and widening the gain spectrum. At 200 mW biaxially symmetrically pumped at 1 480 nm, the 56-way, 56-way at a wavelength separation of 2 nm and a power of -30 dBm at each of the first and second Bi-EDF lengths of 50 cm and 170 cm, respectively C + L band signal, the gain bandwidth of Bi-EDFA higher than 30 dB reaches 90 nm (1 530 ~ 1 620 nm), the average gain is 35.7 dB and the gain fluctuation is only 2.3 dB. At the same time, the noise figure has been significantly improved. The research results have practical guiding significance for the development of C + L band Bi-EDFA with wideband and flat gain.