宽带可重构单光子激光通信发收关键技术研究OA

Single-photon detectors(SPDs)exhibit high sensitivity and strong anti-interference capability,and are often integrated with the traditional pulse position modulation(PPM)technique for long-distance laser communication.However,this integration suffers from low communication rates.To address the rate per-formance limitations of PPM modulation,a broadband reconfigurable pulse sampling data transmission scheme based on single-photon detectors is proposed.In addition,an adaptive pulse-width algorithm tailored to this modulation method is designed to achieve optimal pulse-width selection for the data acquired by single-photon detectors.At the transmitter,the FPGA GTX high-speed transceiver and real-time serial port transceiving are adopted to optimize the transmitted code pattern;at the receiver,a bit error rate(BER)mon-itoring and adaptive algorithm module is developed.Link simulations and adaptive simulations are conduc-ted to evaluate the impacts of actual channel scenarios,and a 1 550 nm single-photon detection experimental system is built for validation.Experimental results show that this modulation scheme enables single-photon laser communication with a rate range from kbps to Mbps.Meanwhile,preliminary tests based on avalanche photodiodes(APDs)demonstrate the feasibility of Gbps-level high-speed communication using this scheme.At the kbps and Mbps rate levels,compared with the default pulse width,the adaptive pulse-width modula-tion algorithm reduces the communication BER by one and two orders of magnitude,respectively.In com-parison with traditional single-photon laser communication systems,this modulation scheme supports wide-rate-range adjustment from kbps to Gbps and optimal pulse-width selection at kbps-Mbps rates,thus provid-ing a novel solution for single-photon detection devices based on different technical routes.