Ren Linhao, Yuan Shixing, Zhu Song, Shi Lei, Zhang Xinliang
Opt Lett. 2022 Sep 1;47(17):4572-4575. doi: 10.1364/OL.468442.
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.
提出并通过实验证明了一种基于二氧化硅微球谐振器背向散射模式的具有千赫兹带宽的可调谐微波光子带通滤波器（MPBPF）。在这项工作中，使用超高品质因数微球谐振器来生成带宽为600 kHz的射频带通响应。同时，引入顺时针模式和逆时针模式之间的散射诱导耦合以减少谐振模式的数量，并获得具有高消光比的单个背向散射模式。因此，实现了调谐范围为40 GHz且抑制比为16.9 dB的MPBPF。该MPBPF具有超窄带宽、大调谐范围和紧凑性等优点，在微波光子应用中显示出巨大潜力。
