Bandpass microwave photonic filter based on cascaded injected semiconductor lasers

A cascaded optically injected semiconductor laser based bandpass microwave photonic filter (MPF) is proposed and then demonstrated by a proof-of-concept experiment in this paper. Combining the two gain spectra of the slave laser, the performance of the MPF is enhanced. The frequency response under different injection parameters are investigated. The tuning range of the passband central frequency is from 11.1 GHz to 38.6 GHz.