Single-tone Extraction from Multi-tone Microwave Signal Based on Injection-locked Optoelectronic Oscillator

Single-tone extraction from multi-tone microwave signal based on an injection-locked optoelectronic oscillator (OEO) is experimentally demonstrated. In this scheme, when the frequency interval of injected multi-tone microwave signal is not equal to the free spectral range of OEO, the carrier with a frequency close to dominate oscillation frequency of free-running OEO can be recovered with an improved sideband suppression ratio and optimized phase noise. In the experimental, a carrier with a frequency near 9.9972 GHz, a sideband suppression ratio of 46.66 dB and phase noise of -114.97 dBc/Hz@10 kHz is extracted from an injected amplitude-modulated signal, whose modulation frequency is 150 kHz and power is -10 dBm.