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在深入研究微波光子滤波器理论的基础上,提出了基于多个FBG对共振腔的微波光子滤波器,根据vernier效应得到了该系统的传输函数。以由两个FBG对组成的微波光子滤波器为例,讨论了反射率R和FBG对之间的间距L对系统传输性能的影响。并进一步研究了组合更多FBG对的微波光子滤波器传输性能,结果表明,随着组合基本陷波滤波器个数的增加,并通过调节FBG对之间的间距L,得到了高抑制比,大自由频程,高Q值的微波光子滤波器。
Based on the in-depth study of the theory of microwave photonic filters, a microwave photonic filter based on multiple FBG resonators is proposed. According to the vernier effect, the transfer function of the system is obtained. Taking the microwave photonic filter composed of two FBG pairs as an example, the influence of the distance L between the reflectivity R and the FBG pair on the transmission performance of the system is discussed. Furthermore, the transmission performance of microwave photonic filters with more FBG pairs is further studied. The results show that with the increase of the number of combined basic notch filters and the high suppression ratio obtained by adjusting the spacing L between FBG pairs, Large free-range, high-Q microwave photon filter.