title: Switchable microwave photonic filter between high Q bandpass filter and notch filter with flat passband based on phase modulation.
abstract: We propose and demonstrate a novel switchable microwave photonic filter based on phase modulation. Both a microwave high Q bandpass filter and a microwave notch filter with flat passband are achieved respectively. And the switchability between them by tuning the two tunable optical bandpass filters is demonstrated. We also present a theoretical model and analytical expression for the proposed scheme. A frequency response of a high Q bandpass filter with a Q factor of 327 and a rejection ratio of exceeding 42 dB, and a frequency response of a notch filter with flat passband with a rejection ratio exceeding 34 dB are experimentally obtained. The operation frequency of microwave photonic filter is around 20 GHz.
authors.affiliation: Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Yu
authors.forename: Enming
authors.initials: E
authors.lastname: Xu
authors.forename: Jianji
authors.initials: J
authors.lastname: Dong
authors.forename: Lina
authors.initials: L
authors.lastname: Zhou
authors.forename: Xiang
authors.initials: X
authors.lastname: Li
authors.forename: Xinliang
authors.initials: X
authors.lastname: Zhang