高速脉冲位置调制对SNSPD 探测光子计数特性影响(特邀)  

Photocount Characteristics of SNSPD for PPM Signals inDeep-Space Laser Communication (Invited)

作　　者：吴晓薇 杨雷[1] 展月英 孙扬 熊蛟 王强[1] Wu Xiaowei;Yang Lei;Zhan Yueying;Sun Yang;Xiong Jiao;Wang Qiang(Technology and Engineering Center for Space Utilization,Chinese Academy of Sciences,Beijing 100094,China;University of Chinese Academy of Sciences,Beijing 100094,China)

机构地区：[1]中国科学院空间应用工程与技术中心,北京100094 [2]中国科学院大学,北京100094

出　　处：《激光与光电子学进展》2024年第7期150-159,共10页Laser & Optoelectronics Progress

基　　金：国家自然科学基金(61971403,62371439,62301533);中国科学院战略性先导科技专项(XDA30030600);中国科学院青年创新促进会(2022161);中国科学院特别研究助理资助项目。

摘　　要：激光通信是近年深空探测领域的研究热点之一。深空激光通信采用脉冲位置调制(PPM)提升通信能量效率,并使用单光子探测器以高效地接收信号。其中,超导纳米线单光子探测器(SNSPD)被广泛认可是最优选择之一。本文分析了SNSPD的死时间和抖动特性,以及高速脉冲信号的拖尾现象,对基于PPM-SNSPD调制探测方式的深空激光通信产生的影响,并计算了SNSPD在该体系下的光子计数特性。基于分析,提出一种偏移补偿保护时隙PPM符号同步算法。相较普通的保护时隙同步算法,所提算法能有效减少PPM-SNSPD体系下的同步误差,提升系统误码率。Deep-space laser communication systems commonly use pulse-position modulation(PPM)to improve the energy efficiency of communication and use single-photon detectors for efficient signal reception.In particular,superconducting nanowire single-photon detectors(SNSPD)are one of the most suitable detector choices.In this study,we investigated the performance of high-speed PPM-SNSPD-based deep-space laser communications in terms of the dead time and jitter of SNSPD as well as the trailing phenomenon of high-speed pulsed signals.The photocount characteristics of SNSPD were analyzed.Based on this analysis,we proposed a bias-compensated guard-time PPM symbol synchronization algorithm.Compared with the conventional guard-time symbol synchronization algorithm,the proposed algorithm effectively reduces synchronization errors and improves system error performance.

关 键 词：自由空间光通信 深空激光通信 脉冲位置调制 单光子探测器 

分 类 号：E963[军事—军事通信学]