基于光纤光栅选频的近单频输出环形腔光纤激光器设计与仿真

近单频光纤激光在相干合成、光通信、激光测量及光谱分析等领域具有独特的优势。目前，采用环形腔光纤激光器实现近单频输出被科研工作者们广泛关注。环形腔光纤激光器中主要使用可调谐光纤光栅滤波器、可调谐带通滤波器、可调谐法布里-珀罗（F-P）滤波器以及可饱和吸收体等实现更好的近单频输出，输出激光的光谱受到滤波器带宽以及环形腔数量的影响。因此，基于光纤光栅选频，使用Optisystem软件进行仿真，通过改变环形腔数量和光纤光栅的3 dB带宽，得到了边模抑制比为88.20 dBm的近单频激光输出。

Design and Simulation of Near-Single Frequency Output Ring Cavity Fiber Laser Based on Fiber Grating Frequency Selection

Due to the fact that the near single frequency fiber laser is characterized with its unique advantages in coherent synthesis, optical communication, laser measurement and spectral analysis, the use of ring cavity fiber laser to achieve near single frequency output has become one of the research focuses for current researchers. Tunable fiber grating filters, tunable bandpass filters, tunable Fabry Perot (F-P) filters, and saturable absorbers are mainly used in ring cavity fiber lasers for a better near single frequency output, with the spectrum of the output laser affected by the filter bandwidth and the number of ring cavities. Therefore, based on fiber Bragg grating frequency selection and simulation, and by using Optisystem software, a near-single frequency laser output with a side mode suppression ratio of 88.20 dBm can be obtained by changing the number of ring cavities and the 3 dB bandwidth of the fiber grating.