CAO Ye,LIU Ce,TONG Zheng-rong.A variable coefficient microwave photonic filter based on multi-wavelength fiber laser and Mach-Zehnder interferometer[J].Optoelectronics Letters,2014,10(6):401-405 A variable coefficient microwave photonic filter based on multi-wavelength fiber laser and Mach-Zehnder interferometer Author Name Affiliation CAO Ye  Key Laboratory of Film Electronics and Communication Devices, Tianjin University of Technology, Tianjin 300384, China  LIU Ce  Key Laboratory of Film Electronics and Communication Devices, Tianjin University of Technology, Tianjin 300384, China  TONG Zheng-rong  Key Laboratory of Film Electronics and Communication Devices, Tianjin University of Technology, Tianjin 300384, China  Abstract:       A microwave photonic filter (MPF) with variable coefficient is proposed and demonstrated, which is constructed by a multi-wavelength fiber laser and Mach-Zehnder interferometer (MZI). Through changing the slope characteristics of Mach-Zehnder interference spectrum adjusted by optical variable delay line (OVDL), the conversion from phase modulation (PM) to intensity modulation (IM) is realized. The multi-wavelength fiber laser with Lyot-Sagnac optical filter has variable wavelength spacing. So the designed filter has a variable number of taps and tap weights. As a result, the tunable range of passband center frequency is 2.6 GHz. The reconfigurability of MPF can be also realized by adjusting the output of fiber laser. Hits: 4146 Download times: 0 This work has been supported by the National High Technology Research and Development Program of China (No.2013AA014200), the National Natural Science Foundation of China (No.61107052), the Natural Science Foundation of Tianjin in China (No.14JCYBJC16500), and the Science and Technology Development Fund Project of Tianjin University (No.2012). View Full Text    Download reader