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Indexed by:Journal Papers

Date of Publication:2015-12-15

Journal:JOURNAL OF LIGHTWAVE TECHNOLOGY

Included Journals:SCIE、EI、Scopus

Volume:33

Issue:24

Page Number:5133-5139

ISSN No.:0733-8724

Key Words:Bandpass filter; bandstop filter; microwave photonic filter; phase-shifted fiber Bragg grating

Abstract:A bandstop-to-bandpass microwave photonic filter (MPF) using a phase-shifted fiber Bragg grating (PS-FBG) and a dual-drive Mach-Zehnder modulator (DD-MZM) is proposed and experimentally demonstrated. The PS-FBG has an ultra-narrow notch in the reflection band. The DD-MZM is employed to generate a phase-modulated or a quasi-single-sideband (QSSB) optical signal by controlling the bias voltage. By applying the phase-modulated or QSSB signal to the PS-FBG to suppress one sideband, a bandpass or a bandstop MPF is implemented. The MPF can be continuously tuned from bandstop to bandpass or vice versa by controlling the bias voltage applied to the DD-MZM. The frequency tuning can be simply done by tuning the wavelength of the optical carrier. The proposed MPF is experimentally evaluated. Continuous tuning from a bandstop to bandpass filter with a bandstop rejection as high as 60 dB and frequency tuning with a frequency tunable range as large as 10 GHz are demonstrated.