A variable coefficient microwave photonic filter based on multi-wavelength fiber laser and Mach-Zehnder interferometer

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.

Keywords

Fiber Laser / Single Mode Fiber / Radio Frequency Signal / Wavelength Spacing / IEEE Photonic Technology Letter

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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).