一种基于掺铒光纤光栅环的微波光子滤波器

A Microwave Photonic Filter Based on Er-doped Fiber Loop with FBG

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 study of erbium-doped fiber（EDF） and fiber Bragg grating（FBG）, a microwave photonic filter based on erbium-doped fiber Ioop with FBG was put forward. The transfer function of the microwave photonic filter was derived according to its signal flow graph. And then the effects of coupling coefficient, the gain of the erbium-doped fiber, the reflectivity of the fiber 13ragg grating and the length of the fiber ring on the transmission characteristics of the system were discussed. Theoretical calculation and simulation analysis indicate that the best filtering effect of the microwave photonic filter can be obtained when the coupler factor is 0.5, the gain of the erbium-doped fiber is 2 and the reflectivity of the FBG is 1.