Abstract
A new microwave photonic filter (MPF) hybrid of two filters that can realize bothmultiple taps and a flat bandpass or bandstop response is presented. Based on thephase character of a Mach–Zehnder modulator (MZM), a two taps finite impulseresponse (FIR) filter is obtained as the first part. The second part is obtained bytaking full advantage of the wavelength selectivity of the fiber Bragg grating(FBG) and the gain of a erbium-doped fiber (EDF). Combining the two filters, theflat bandpass or bandstop response is realized by changing the coupler’s factork, the reflectivityof FBG1 R1 or thegain of the EDF g. Optimizing the system parameters, a flat bandpass response with amplitude depth of more than 45 dB isobtained at k = 0.5, R1 = 0.33,g = 10, and a flat bandstop response is also obtained atk = 0.4,R1 = 0.5,g = 2. In addition, the free-spectral range (FSR) can be controlled by changing the length of theEDF and the length difference between two MZMs. The method is proved feasible by someexperiments. Such a method offers realistic solutions to support future radio-frequency(RF) optical communication systems.
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