Abstract

A tunable and reconfigurable bandpass microwave photonic filter (MPF) is demanded in scenarios where different center frequencies and bandwidths are required. Here, we propose and demonstrate a silicon-on-insulator (SOI)-based microwave photonic bandpass filter, whose center frequency and bandwidth can be adjusted. The MPF is implemented by using four cascaded microring resonators (MRRs) that fabricated based on SOI wafer. Each MRR combines the design of multi-mode waveguides and tunable coupling regions, thereby exhibiting simultaneous high frequency selectivity and excellent reconfigurability. The center frequency can be tuned by adjusting the resonant wavelengths of the MRRs, and the bandwidth can be reconfigured by adjusting the coupling coefficients as well as the resonant wavelengths of the MRRs. The operation state of each MRR can be monitored and thus the MPF can be adjusted precisely. In the experiment, the bandwidth and center frequency of the MPF are adjusted from 0.7 to 2 GHz and from 5.2 to 35.8 GHz, respectively. During the adjustment, the rejection ratio of the MPF remains above 40 dB. The link performance, including the link gain, noise figure and spurious-free dynamic range, are also charactered. The achieved MPF can be potentially applied to radar, sensor networks, and wireless communications.

Tunable bandpass microwave photonic filter with largely reconfigurable bandwidth and steep shape factor based on cascaded silicon nitride micro-ring resonators

Wei Cheng, Dongdong Lin, Pengfei Wang, Shangqing Shi, Mengjia Lu, Jin Wang, Chen Guo, Yifei Chen, Zhao Cang, Zhuang Tian, Zien Liang, Guohua Hu, and Binfeng Yun
Opt. Express 31(16) 25648-25661 (2023)

Silicon-on-insulator-based microwave photonic filter with narrowband and ultrahigh peak rejection

Xiaolong Liu, Yuan Yu, Haitao Tang, Lu Xu, Jianji Dong, and Xinliang Zhang
Opt. Lett. 43(6) 1359-1362 (2018)

Silicon-on-insulator-based microwave photonic filter with widely adjustable bandwidth

Lu Xu, Jie Hou, Haitao Tang, Yuan Yu, Yu Yu, Xuewen Shu, and Xinliang Zhang
Photon. Res. 7(2) 110-115 (2019)

Ultra-high peak rejection notch microwave photonic filter using a single silicon microring resonator

Yun Long and Jian Wang
Opt. Express 23(14) 17739-17750 (2015)

Low-power all-optical microwave filter with tunable central frequency and bandwidth based on cascaded opto-mechanical microring resonators

Li Liu, Zhi Chen, Xing Jin, Yue Yang, Zhihua Yu, Jingjing Zhang, Lijun Zhang, and Hong Wang
Opt. Express 25(15) 17329-17342 (2017)