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A flexible and incoherent microwave photonic filter with a flat‐top passband
Author(s) -
Yu Xianbin,
Zhang Xianmin,
Chi Hao,
Chen Kangsheng
Publication year - 2005
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.20922
Subject(s) - passband , free spectral range , optics , filter (signal processing) , microwave , fiber bragg grating , band stop filter , resonator , all pass filter , band pass filter , physics , electronic engineering , materials science , acoustics , engineering , optical fiber , low pass filter , telecommunications , electrical engineering
Abstract A microwave filter realized by combing a recirculating filter based on a fiber Bragg grating (FBG) resonator and a matched two‐arm delay line is presented. The proposed configuration can generate a flexible notch filter with a wide flat‐top passband, which overcomes the limitations of the filter‐transfer‐function range of a positive‐only taps system. An incoherent system is employed which avoids the coherent‐interference problem of photonic signal processors. The theoretical and experimental results reveal that more than 50% free spectral range can be flattened by this method, and the ripples in the passband are less than 0.5 dB. © 2005 Wiley Periodicals, Inc. Microwave Opt Technol Lett 46: 132–134, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.20922