Ultra-Wideband Optoelectronic Spectrum Analysis Technology

The modern electromagnetic environment is increasingly complex.In the application scenarios of communication and radar,we need to quickly analyze and identify the received signal to obtain the relevant parameter information of the signal.With the advancement and improvement of technology,from the birth of analog channelization technology in the 1970 s to the application of digital channelization,it can be seen that the development trend of spectrum analysis system is large instantaneous bandwidth,real-time signal processing,large dynamic range,and time.Domain overlap signal processing,high sensitivity and frequency resolution.Traditional spectrum analysis techniques are mostly based on DSP signal processing technology.Due to the huge data volume and computational tasks of real-time high-capacity radar signal processing,realtime signal processing systems put forward higher requirements on the storage and computing power of digital processing.Traditional systems Not only is the sampling rate limited,but the range of processing frequency is limited,so this paper uses the photoelectric synergy technology to process the ultra-wideband signal.The use of optical processing is based on the characteristics of photoelectric signal processing,such as high capacity,fast,high efficiency,and these characteristics are unmatched by computers.A novel real-time optronic system for spectrum awareness in remote sensing is proposed,which provides ultra-broad bandwidth as well as realtime processing speed.A Mach-Zehnder modulator modulates the unknown RF signal to the light wave generated by a Laser Diode.Then a spatial time conversion device converts a serial optical signal in time domain to parallel optical signals in spatial domain.And thanks to the inherent ability of converging lens to perform two dimensional Fourier transform at the speed of light,the frequency spectrum information can be obtained much more easily and fast compared to conventional electronic wideband techniques by using analog-to-digital conversion.In this paper,principle and system design will be discussed,last but not least,simulation and equivalent experiment will be implemented to verify the performance of our system.This paper attempts to start from the optical system,eliminating the complicated and cumbersome calculation process in the traditional digital signal processing process,alleviating the storage pressure and shortening the calculation delay.Finally,this paper analyzes the problems encountered in the processing of ultra-wideband signals in optical systems and the corresponding solutions,and proposes the next step of improvement,and completes the feasibility verification of optical ultra-wideband signal processing.