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为了得到噪声性能优良的增益锁定掺铒光纤放大器，提出利用掺铒光纤放大器噪声指数曲线在浅饱和区有一凹陷的特性以及强激光功率对放大的自发辐射的抑制作用，可以改善增益锁定放大器的噪声特性，并在以反馈环路实现增益锁定的掺铒光纤放大器光路结构上实验研究了不同反馈深度对放大器的噪声特性的影响，结果表明在正向泵浦放大光路中引入同向选频激射，通过适当选择反馈深度即放大器的工作点，可以在获得足够宽的输入信号动态范围的同时获得比反馈锁定前更低的噪声指数。
In order to obtain a gain-locked erbium-doped fiber amplifier with excellent noise performance, the paper proposes that the use of erbium-doped fiber amplifier noise index curve has a recess in the shallow saturation region and strong laser power on the amplified spontaneous emission inhibition can improve the gain lock-in amplifier noise The effects of different feedback depths on the noise characteristics of the amplifier are experimentally studied on the optical path structure of EDFA with feedback loop gain lock. The results show that introducing the same direction of frequency selective lasing By properly selecting the feedback depth, ie, the operating point of the amplifier, a lower noise figure than before the feedback lock can be obtained while obtaining a sufficiently wide dynamic range of the input signal.