一种大气激光通信系统抗干扰调制/解调技术  

Anti-Jamming Modulation/Demodulation Technology of Atmospheric Laser Communication System

作　　者：刘丹[1] 刘智[2] 王璞瑶[2] 姜会林[3] 

机构地区：[1]长春理工大学光电工程学院,吉林长春130022 [2]长春理工大学电子信息工程学院,吉林长春130022 [3]长春理工大学空间光电技术研究所,吉林长春130022

出　　处：《中国激光》2012年第7期141-147,共7页Chinese Journal of Lasers

基　　金：国家自然科学基金面上项目(60677009)资助课题

摘　　要：空间光通信以大气为介质进行信息传输时,不可避免地受到大气散射、大气湍流及背景光等因素的影响。针对大气信道对通信质量的影响,提出了基于激光偏振态参数的调制与解调技术,设计了一种基于偏振移位键控(PolSK)的大气激光通信系统并对其原理进行了简要分析。该通信系统采用偏振移位键控的调制方式,即利用圆偏振光的两种旋态(左旋和右旋)进行编码、调制从而实现数据的传输,接收端采用平衡探测方法进行光信号解调。对系统性能进行仿真分析,结果表明,基于激光偏振态参数的调制与解调技术在抗大气环境干扰、提高数据传输速率和降低误码率等方面具有优越性,在未来的空间激光通信领域有广阔的发展空间和应用前景。Abstract When free space optical communication system uses the atmosphere as a raedium for information transmission, received signals are inevitably influenced by the atmospheric environment, atmospheric turbulence, background light factors, and so on. Considering that the atmosphere channel has a great influence on the laser atmosphere communication quality, a modulation/demodulation technology based on polarization parameters is proposed, and an atmospheric laser communication system based on polarization shift keyin..g （PolSK） is designed. This system uses polarization shift keying modulation. In this modulation, two rotation states of circle polarization （left and right） are used for information transmission. In the receiver, the optical signal is detected with balance detection method. At the same time, the performance of the system is simulated. The results show that the modulation/demodulation techniques based on polarization parameters have unique adwntages, such as anti- atmospheric interference, high data rate and low bit error rate, it will have broad prospects for development and application in future space laser communication.

关 键 词：光通信 偏振移位键控 平衡探测 误码率 

分 类 号：TN91[电子电信—通信与信息系统] TN92[电子电信—信息与通信工程]