Study On Applications Of The Optically Injected Semiconductor Laser Technology In Microwave Photonics

Microwave photonics serves as a bridge connecting photonics and microwave engineering.As one multi-functional and flexible photonics platform,microwave photonics overcomes inherent limitations of electronics in processing microwave signals.As a reliable,efficient,easily integrated and directly modulated coherent light source,semiconductor laser exhibits a variety of nonlinear behaviors such as injection locking,period one oscillation,and four-wave mixing under different optical injection conditions.These nonlinear behaviors with different properties and characteristics can be applied to different branches of microwave photonics.Such system has features of flexible processing methods,easy to be integrated,simple constructure,potential in all-optical generation and processing of microwave signal without external microwave source,and so on.Therefore,it is worth studying applications of optically injected semiconductor laser technology in microwave photonics.This thesis focuses on the generation and processing of microwave signal,the generation and optimization of optical frequency comb based on period-one oscillation and sideband locking of optically injected semiconductor laser.Microwave photonic filter is realized by using sideband locking effect.The generation of microwave signal and optical frequency comb is realized by using period one oscillation.The optoelectronic feedback technology and sub-harmonic modulation combined with four-wave mixing are used to optimize the performance of optically generated microwave signal and optical frequency comb respectively.The main work of this thesis is as follows:1.The research progress of microwave photonics and optically injected semiconductor laser technology is introduced.The principle and system of common optically generated microwave schemes,and the application direction of typical nonlinear states of optically injected semiconductor laser in microwave photonics is mainly introduced.The research progress of applications of the optically injected semiconductor laser technology in microwave photonics in recent years is summarized.2.Microwave photonic filter is realized based on the sideband locking effect.It is verified by simulation and experiment.Finally,microwave photonic filter with tunable passband center frequency is realized with bandwidth of about 40 MHz and out-of-band rejection ratio of 25 d B.3.Based on period-one oscillation,a scheme of optically generated microwave is proposed.The improvement effect of optoelectronic feedback technology on the performance of the generated microwave signal and the tunability of the scheme are studied by simulation.The generated microwave signal with the frequency of8.0236 GHz is experimentally obtained,which the single-sideband phase noise is low to-117.13 dBc/Hz@10k Hz.4.Based on the period-one oscillation,a scheme of generating optical frequency comb is proposed.The improvement effect of sub-harmonic modulation combined with four-wave mixing on the performance of optical frequency comb is studied by simulation.Stable optical frequency combs are observed with comb spacing of 4GHz,comb lines number of 14 in 18 d B range and comb spacing of 5GHz,comb lines number of 13 in 19dB range.