多调制格式兼容的空间激光高速通信调制仿真与实验研究  

Simulation and Experimental Research of Multimodulation Format Compatible Space Laser High-Speed Communication Modulation

作　　者：赵贺 张鹏[1,2] 杨志群 欧阳举 田东升 刘壮 王大帅 姜会林[1] Zhao He;Zhang Peng;Yang Zhiqun;Ouyang Ju;Tian Dongsheng;Liu Zhuang;Wang Dashuai;Jiang Huilin(School of Electro-Optical Engineering,Changchun University of Scienceand Technology,Changchun,Jilin 130012,China;School of Electronic Information Engineering,Changchun University of Scienceand Technology,Changchun,Jilin130012,China;School of Precision Instrumentand Opto-Electronics Engineering,Tianjin University,Tianjin 300072,China)

机构地区：[1]长春理工大学光电工程学院,吉林长春130012 [2]长春理工大学电子信息工程学院,吉林长春130012 [3]天津大学精密仪器与光电子工程学院,天津300072

出　　处：《中国激光》2022年第7期107-117,共11页Chinese Journal of Lasers

基　　金：国家自然科学基金(61705019);吉林省国际科技合作项目(20200801053GH);吉林省教育厅基金(JJKH20200752KJ)。

摘　　要：为了顺应自由空间光通信多调制格式兼容的趋势,改善系统灵活性差、成本较高等问题,提出一种基于双IQ调制器的多调制格式兼容的激光通信发射方案。首先,基于Optisystem软件建立系统模型仿真分析,所得眼图和星座图验证了所提方案的正确性;然后,研制了多调制格式兼容发射硬件,并实验研究了调制格式的兼容性、可切换性和通信性能。实验结果表明:所设计硬件兼容发射OOK、BPSK、DPSK、QPSK、PM-DQPSK 5种调制格式;速率分档可调,最高可达40 Gbit/s;当发射端产生40 Gbit/s PM-DQPSK调制格式信号时,在离线接收条件下,误码率为10^(-7)时的灵敏度达到-39.8 d Bm。通信调制仿真及实验结果验证了所设计方案的可行性,所得到结果也为空间激光通信系统设计提供了技术参考。Objective Recently,free space optical communication(FSO)technology has been widely used,and our country’soptical communication technology level has also been significantly improved.The traditional IM/DD modulationmethod has been unable to meet the requirements of high-rate optical communication.The optical communicationsystem of phase modulation/coherent detection can effectively improve the receiving sensitivity of the system underhigh-rate conditions.However,the system composition is more complicated.If the two modulation methods can becompatible with the same system,the flexibility and applicability of the optical communication system will besignificantly improved.In the 2008 International Optical Engineering Society,related reports compared and studiedthe three modulation formats of 2.667 Gbit/s OOK,DPSK,and PPM for FSO.The results showed that themodulation format used to make the system have better communication performance is determined according to actualconditions,such as system complexity,cost,and data transmission rate.Therefore,to comply with the trend ofmultimodulation format compatibility in free-space optical communications and improve system flexibility,this studyproposes a laser communication transmission scheme compatible with multimodulation formats based on dual IQmodulators.The proposed system is compatible with five modulation formats(OOK,BPSK,DPSK,QPSK,and PMDQPSK).Methods This compatible system is based on dual IQ modulators.First,we theoretically analyze the format compatibility of the dual IQ modulator.It natively supports the PM-DQPSK modulation format.It can also switch the format by changing the bias voltage of a certain arm and changing the working mode of MZM.Second,based on the dual IQ modulation system described in theory,we establish a multimodulation compatible transmitter system block diagram on the simulation software and conduct simulation analysis on OOK,BPSK,DPSK,QPSK,and DQPSK.The receiver of the OOK format uses a direct demodulation system,and other formats use a coheren

关 键 词：光通信 空间激光通信 多调制格式兼容系统 IQ调制器 灵敏度 

分 类 号：TN914.1[电子电信—通信与信息系统]