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本文主要研究了微波光子滤波器的滤波原理,分析了滤波器的基本结构,并针对目前的研究热点介绍微波光子滤波器的设计方法。其一项重要指标是高品质因数Q,其大小决定了滤波器的选频性能,分别以光纤环和光纤光栅作为不同的延时单元来举例,列出了几种典型高Q值微波光子滤波器的结构,并分析滤波器级联的原理及利用正抽头得到负抽头滤波器的方法。
This paper mainly studies the principle of microwave photonic filter, analyzes the basic structure of the filter, and introduces the design method of microwave photonic filter for the current research hotspot. An important indicator of this is the high quality factor Q, which determines the frequency selectivity of the filter, using fiber-optic rings and fiber gratings as different delay elements, and lists several typical high-Q microwave photonic filters The structure of the device is analyzed. The principle of the filter cascade is analyzed and the method of using the positive tap to obtain the negative tap filter is given.