Wavelength Automatic Tracking Technology For Microwave Photon Receiving Front End

In the era of information warfare,electromagnetic pulse attack has gradually become one of the most important combat methods.As the core component of radar,communication,measurement and control systems,the radio frequency receiving front end is extremely vulnerable to strong electromagnetic pulse weapons.The development of security protection technology is not ideal;the microwave photonic technology is used in the architecture of the radio frequency receiving front-end,and the all-dielectric microwave photon receiving front-end is proposed,so that the receiving front-end not only has the advantages of large bandwidth and high-speed information processing and transmission capabilities,but also It is completely immune to high-energy electromagnetic attacks;however,the resonant wavelength of the micro-ring resonator,a key component in the microwave photon receiving front-end,is extremely susceptible to interference from ambient temperature and drifts.The laser working wavelength will mismatch with the micro-ring resonance wavelength,resulting in the front-end system can not work normally,in order to meet the needs of how to keep the laser working wavelength and the microring resonance wavelength matching,this paper proposes a microwave photon receiving front-end working wavelength automatic tracking technology,the main research work is as follows:(1)Based on the analysis of the working principle of the micro-ring resonator,the optical waveguide structure model of the micro-ring resonator was established,and the temperature sensitivity of the micro-ring resonance wavelength and free spectral range was simulated.The change rate of the resonant wavelength of the microring with temperature is 1.47pm/℃,and the change rate of the free spectral range with temperature is-0.16MHz/℃.The specific impact of the drift of the microring resonance wavelength and free spectral range on the front-end system is analyzed,which shows the necessity of applying wavelength automatic tracking technology in the front-end.(2)The working wavelength automatic tracking technology includes two cores,namely how to tune the laser wavelength and the direction in which the laser wavelength should be tuned.For how to tune the laser wavelength,a solution based on optical injection locking technology to achieve continuous micro-wavelength tuning is given.In the direction of laser wavelength tuning,a method of extracting error signals based on PID algorithm is proposed,and related hardware circuits are designed and made.(3)The performance test of the continuous micro-wavelength tunable laser source has been completed.The final tuning range of the laser source can reach 3GHz;such a laser source has great advantages in light source quality,stepping,and response speed.In order to verify the feasibility of the wavelength automatic tracking technology,the fiber Bragg grating was used to replace the microring resonator,and the preliminary test of the wavelength automatic tracking system was completed.The experimental results prove that this method can match the laser wavelength with the best operating point,the control error is relatively small,and the system performance is good.The wavelength automatic tracking technology is expected to be used in the all-medium microwave photon receiving front end.