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在深入研究掺铒光纤和光纤光栅的基础上,提出了一种基于掺铒光纤光栅环的微波光子滤波器结构模型。根据信号流程图得到了该微波光子滤波器的传输函数,讨论了光纤耦合器的耦合系数、掺铒光纤增益、光纤光栅反射率和光纤环长对系统传输性能的影响。通过理论计算和仿真分析可知,在光纤耦合器的耦合系数为0.5、掺铒光纤增益为2、光纤光栅反射率为1时,得到的微波光子滤波器的滤波效果最好。
Based on the further study of erbium-doped fiber and fiber grating, a microwave photonic filter structure model based on erbium-doped fiber grating rings is proposed. The transfer function of the microwave photonic filter is obtained according to the signal flow diagram. The influence of the coupling coefficient of the fiber coupler, the gain of erbium-doped fiber, the reflectivity of the fiber grating and the fiber ring length on the transmission performance of the system are discussed. Through the theoretical calculation and simulation analysis, it can be seen that the filter effect of the microwave photonic filter is the best when the coupling coefficient of the fiber coupler is 0.5, the gain of the erbium-doped fiber is 2, and the reflectivity of the fiber grating is 1.