Frequency-modulated Microwave Signal Generation by Dual-Wavelength Optically Injected Semiconductor Laser

A dual-wavelength optically injected semiconductor laser system working with period-one dynamic is proposed for generation of frequency-modulated microwave signals. In the proposed system, two master lasers with different frequencies are combined and injected into a slave laser simultaneously. Thanks to the period-one oscillations, frequency-modulated microwave signals can be generated without using extra modulates or signal generates. Numerical simulations based on a set of modified nonlinear rate equations are conducted to investigate the performance of the proposed system, and a proof-of-concept experiment is carried out, in which a frequency-modulated microwave signal having a bandwidth of 5.3 GHz (13.2–18.5 GHz) is successfully generated.