Tunable kilohertz microwave photonic bandpass filter based on backscattering in a microresonator

被引:7
|
作者
Ren, Linhao [1 ]
Yuan, Shixing [1 ]
Zhu, Song [1 ]
Shi, Lei [1 ,2 ]
Zhang, Xinliang [1 ,2 ]
机构
[1] Huazhong Univ Sci & Technol, Wuhan Natl Lab Optoelect, Wuhan 430074, Peoples R China
[2] Opt Valley Lab, Wuhan 430074, Peoples R China
基金
中国国家自然科学基金;
关键词
INDUCED TRANSPARENCY; RESONATORS; SCATTERING; PASSBAND;
D O I
10.1364/OL.468442
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
A tunable microwave photonic bandpass filter (MPBPF) with a kilohertz bandwidth based on the backscattering mode of a silica microsphere resonator is proposed and experimentally demonstrated. In this work, an ultrahigh-quality-factor microsphere resonator is used to generate a radio frequency bandpass response with a bandwidth of 600 kHz. Meanwhile, scattering-induced coupling between the clockwise mode and the counterclockwise mode is introduced to reduce the number of resonance modes, and a single backscattering mode which has a high extinction ratio is obtained. Therefore, an MPBPF with a tuning range of 40 GHz and a rejection ratio of 16.9 dB is realized. This MPBPF possesses advantages such as ultranarrow bandwidth, large tuning range, and compactness, and shows great potential for microwave photonic applications. (c) 2022 Optica Publishing Group
引用
收藏
页码:4572 / 4575
页数:4
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