The Reserach Of Optoelectronic Oscillator Based On Optical Injection Technology

With the continuous progress and development of information and communication technology in modern society,the communication mode is more diversified.And the processing and transmission of massive information make people have higher and higher requirements on signal quality.In the application fields of wireless communication,radar,signal processing and electronic warfare,the research on signal is moving towards the direction of high frequency and wideband.Based on microwave photonics,the optical generation of microwave signals can fully meet the requirements on high frequency and low phase noise in practical applications.The optoelectronic oscillator(OEO)has been considered as the best technique to acquire microwave signals with low phase noise.Semiconductor lasers with external perturbations can generate a wealth of nonlinear dynamic characteristics and have broad application prospects in fields such as information encryption and all-optical signal processing.Moreover,the optically generated microwave based on such nonlinear characteristics has also been applied in the field of microwave photonics.This thesis combines the advantages of the two techniques to.obtain the microwave signals of high quality.Main content of this thesis is as below:1.This thesis firstly introduced the development background of microwave photonics,common photogenic microwave methods and principles,and focused on reviewing the main research directions and trends of optoelectronic oscillator(OEO),as well as the development process of OEOs based on optical injection technology and their recent research progress;2.According to the rate equations of semiconductor lasers,this thesis theoretically analyzed the dynamics of optically injected semiconductor lasers.Especially,the period-one oscillation characteristics of the optically injected semiconductor laser were numerically simulated.The influence of the injection parameters,frequency detuning and injection strength,on the tunability of optically generated microwave was studied.Moreover,the linewidth improvement originated from the technologies of sub-harmonic modulation,optoelectronic feedback and optical feedback were mainly numerically investigated.3.This thesis proposed and verified a novel OEO scheme based on a combinedtechnique of optical injection and sub-harmonic modulation,which also featured with modulator-free and filter-free.The experimentally generated 11.42 GHz microwave signal was demonstrated.By adjusting the sub-harmonic modulation power to optimize the phase noise of microwave signal characteristics,the microwave signal phase noise of 101.21dBc/Hz@10kHz was obtained with the sub-harmonic modulation signal power of 8 dBm.