碲基掺铒光纤放大器增益均衡的数值模拟

针对宽带碲基掺铒光纤放大器(EDTFA)本征增益谱不平坦特性,研究了采用双级串连结构,并在两段光纤中间加入增益均衡滤波器来实现增益平坦.模拟结果显示,通过设计一定结构的滤波谱,在37信道同时输入的情况下,铒离子掺杂浓度为4000 ppm时,使1536～1608 nm范围带宽内的增益达到了24 dB左右,噪声指数小于5.5 dB,增益谱的不平坦度小于1 dB;铒离子掺杂浓度为6000 ppm时,使1536～1608 nm范围带宽内的增益达到了23.5 dB左右.噪声指数小于5 dB,增益谱的不平坦度小于1dB.优化后的级连EDTFA可以满足WDM系统的要求.

Numerical simulations on gain equalization of erbium-doped tellurite-based optical fiber amplifier

As we know, the intrinsic gain spectrum characteristics of broadband tellurite-based fiber amplifier (EDTFA) is not flat, so we designed a kind of dual-stage structure with a gain equalization filter between fibers. The theoretical simulation result shows that the fiber with 4000 ppm Er3 concentration achieved a gain of 24 dB and noise figure of 5.5 dB with a slight gain excursion of 1 dB and the fiber with 6000 ppm Er3 concentration also achieved a gain of 24 dB and noise figure of 5 dB with a slight gain excursion of 1dB over a wide wavelength range of 1536~1608 nm through designing certain filters. The dual-stage EDTFA can meet the demand of WDM system after optimization.