Abstract
A novel approach to realize a microwave photonic filter (MPF) based on gain-switched optical pulses is proposed and demonstrated. The proposed MPF using directly modulation-based optical source is more flexible and simple than using an external modulation-based optical frequency comb source. A theoretical model describing the principle of the proposed MPF is derived, which is confirmed by experimental results. Under different modulation and injection parameters, we present a numerical simulation of the frequency response of the proposed MPF. With no discernible tones, the proposed MPF is demonstrated by a proof-of-concept experiment. A single passband is achieved, which can be continuously tuned from 1 to 30 GHz. Further, self-phase modulation is explored in the optical domain to broaden the spectrum of gain-switched optical pulses and narrow down the bandwidth of the MPF passband.
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