Open AccessSwitchable microwave photonic filter between high Q bandpass filter and notch filter with flat passband based on phase modulation
Author(s) -
Yuan Yu,
Enming Xu,
Jianji Dong,
Lina Zhou,
Xiang Li,
Chi Zhang
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.025271
Subject(s) - passband , band pass filter , band stop filter , optics , prototype filter , voltage controlled filter , materials science , high pass filter , filter (signal processing) , optical filter , butterworth filter , transition band , microwave , low pass filter , physics , telecommunications , computer science , computer vision
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.