Notch/bandpass Microwave Photonic Filter Based on a Microring Resonator and a LiNbO3 Phase Modulator

摘要

A notch/bandpass microwave photonic filter (MPF) with tunable frequency based on a microring resonator (MRR) and a LiNbO3 phase modulator is proposed and experimentally demonstrated. By adjusting the polarization controller (PC) between the PM and the MRR, the MPF can switch between a bandpass filter and a notch filter. The frequency of the MPF can be tuned by changing the wavelength spacing between the optical carrier and the resonator wavelength of the MMR. A proof-of-concept experiment is carried out. The notch/bandpass filter with a rejection ratio of 27 dB/15 dB can be achieved during a frequency tuning range from 9 GHz to 18.5 GHz.