一种基于FBG对的微波光子滤波器的结构设计与分析

摘要

提出了一种改进的基于FBG对的微波光子滤波器结构,该滤波器主要是通过引入线性高斯切趾光纤光栅来实现光纤延迟线的功能.在仿真软件Optisystem平台下进行了详细的结构仿真和性能分析,对不同数值的掺饵光纤放大器(EDFA)最大输出功率下得到的滤波器Q值进行了仿真、讨论和分析,研究发现当EDFA的最大输出功率改变时,滤波器的Q值也会发生相应变化,并存在最优值.仿真结果表明:提出的改进结构优于传统的基于单个FBG的滤波器结构,最大Q值从85提高到207,并且这种方案是实际可行的.%This paper presents an improved FBG - based microwave photonic filter structure, which mainly uses Gaussian Apo-dized linearly Chirped Fiber Gratings as optical delay lines to achieve the function. On the platform of the simulation software Op-tisystem , a detailed simulation and performance analysis of the structure is carried out. Study found that as the maximum output power of EDFA changes, the Q of the filter will change accordingly, and there exists an optimal value. The Q values under different values of the maximum output power of EDFA have been carefully simulated, discussed and analyzed. The simulation results confirm that the improved structure using a pair of FBG is much better than the traditional structure using one single FBG, the Q value of the filter changes from 85 to 207 and it is feasible.