A Novel Approach to Realizing a Widely Tunable Single Passband Microwave Photonic Filter Based on Optical Injection


In this paper, a unique approach to realize one passband microwave photonic filter (MPF) with wideband tunability primarily based on an optical-injected distributed feedback (DFB) semiconductor laser is proposed and experimentally demonstrated. The fundamental principle is based on the wavelength-selective amplification of the DFB laser underneath optical injection. The frequency tunability, insertion loss, and out-of-band suppression ratio of the proposed MPF are investigated in the experiment. By varying the injection locking parameters, MPFs with the frequency tuned from eleven to 41 GHz are achieved, and the insertion losses and out-of-band suppression ratios are around twenty dB. They are helpful in applications where high frequency and wideband tunability are needed.

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