激光与光电子学进展, 2019, 56 (3): 030605, 网络出版: 2019-07-31
基于啁啾光纤布拉格光栅的可调谐双通带微波光子滤波器 下载: 1212次
Tunable Dual-Bandpass Microwave Photonic Filter Based on Chirped Fiber Bragg Grating
光纤光学 微波光子学 可调谐双通带 微波光子滤波器 啁啾光纤布拉格光栅 马赫-曾德尔干涉仪 fiber optics microwave photonic tunable dual-bandpass microwave photonic filter chirped fiber Bragg grating Mach-Zehnder interferometer
摘要
提出了一种基于啁啾光纤布拉格光栅(CFBG)的可调谐双通带微波光子滤波器(MPF)结构,并对该结构进行了实验验证。利用两个级联的拥有不同中心反射波长、带宽及啁啾率的CFBGs,对已调制的光信号产生不同延时,获得了两个不同的频率通带。基于此,通过调整马赫-曾德尔干涉仪(MZI)中的可调谐光延迟线,改变MPF的自由频谱范围,可实现两个通带中心频率的调谐。实验中获得的中心频率分别为6.75 GHz和16.07 GHz的频率通带。通过调节MZI两臂的臂长差,实现了MPF中心频率的调谐。所提出的双通带MPF结构简单,具有很好的可调谐性和稳定性。
Abstract
A structure of tunable dual-bandpass microwave photonic filter (MPF) based on chirped fiber Bragg grating (CFBG) is proposed and experimentally demonstrated. By using two cascaded CFBGs with different central reflection wavelengths, bandwidths and chirp parameters, and the different delays of the modulated light signal in this structure are introduced. Consequently, two different frequency passbands are realized. On this basis, by adjusting the variable optical delay line in Mach-Zehnder interferometer (MZI) to change the free spectral range of MPF, the central frequencies of the two passbands can be tuned. Two different passbands with the central frequencies of 6.75 GHz and 16.07 GHz are obtained in the experiment. By adjusting the optical path difference between the two arms of MZI, the tuning of the central frequency of MPF is achieved. The proposed dual-bandpass MPF has a simple structure and is of good tunability and stability.
赵彪, 杜鹏飞, 沃江海, 丛雯珊, 张钧凯, 余岚. 基于啁啾光纤布拉格光栅的可调谐双通带微波光子滤波器[J]. 激光与光电子学进展, 2019, 56(3): 030605. Biao Zhao, Pengfei Du, Jianghai Wo, Wenshan Cong, Junkai Zhang, Lan Yu. Tunable Dual-Bandpass Microwave Photonic Filter Based on Chirped Fiber Bragg Grating[J]. Laser & Optoelectronics Progress, 2019, 56(3): 030605.