实时化自由空间光通信技术研究  

Real-Time Free-Space Optical Communication Technology

作　　者：敖学渊 杨奇 戴潇潇 吴俊宇 王忠忠 王元祥 刘陈[1] Ao Xueyuan;Yang Qi;Dai Xiaoxiao;Wu Junyu;Wang Zhongzhong;Wang Yuanxiang;Liu Chen(School of Optical and Electronic Information Huazhong University of Science and Technology,Wuhan 430074,Hubei,China)

机构地区：[1]华中科技大学光学与电子信息学院,湖北武汉430074

出　　处：《中国激光》2022年第12期252-259,共8页Chinese Journal of Lasers

基　　金：国家重点研发计划(2018YFB1801303);WNLO创新基金。

摘　　要：针对自由空间光(FSO)通信的实时化应用问题,本文采用自研的收发一体实时数字相干通信模块,基于自由空间光信道,通过实验验证了8×10 Gb/s、偏振复用正交相移键控(PDM-QPSK)信号的实时相干通信系统。在7%前向纠错码(FEC)条件下,通过使用掺铒光纤放大器(EDFA)调整接收端功率,该实时数字相干通信系统的单通道背靠背接收灵敏度达到了-50 dBm左右;8路信道的光载波频率间隔为12.5 GHz,且在不引入其他损耗的情况下,通过1 m左右的空间光链路实现了全信道的无误码传输。Objective Recently,there has been a rapid evolution in optical communication systems,leading to the establishment and development of various subdivisions,such as metropolitan area networks,access networks,and data center optical interconnection.However,current optical network architectures available on the ground are becoming insufficient to meet the growing demands of the society.Therefore,some new application scenarios,such as satellite communication,marine communication,and communication in some areas where optical fibers are difficult to arrange,e.g.,mountains,forests,and lakes,are attracting widespread attention.Based on current optical communication network architectures,a three-dimensional,spatial,and multimodal optical network system is emerging.In this system,the free-space optical(FSO)communication featuring unlicensed bandwidth,high capacity,strong confidentiality,and easy setup plays an important role.Therefore,for practical in-field application of FSO communication,studies on embedded real-time FSO systems are necessary.Methods To investigate the real-time applications of FSO transmission,in this study,we experimentally demonstrate a real-time multicarrier FSO communication system with a self-designed electrical board,including a field-programmable gate array(FPGA),four-channel transmitter supporting 2.5 GBaud signals,and 4×5 GSa/s analog-to-digital converter(ADC).The 10 Gb/s polarization digital multiplexing quadrantile phase-shift keying(PDM-QPSK)signals were generated using a dual-polarization IQ(DP-IQ)modulator and loaded onto eight optical carriers spaced at 12.5 GHz.All optical carriers can be recovered with an error-free bit error ratio(BER)performance.Results and Discussions The experiment setup of the real-time 8×10 Gb/s PDM-QPSK coherent transmission over a 1 mFSO link and the experiment platform are shown in Figs.1 and 5(a),respectively.At the transmitter side of the system,eight external cavity lasers with~100 kHz linewidth spaced at 12.5 GHz were used as the sources.All the channels we

关 键 词：光通信 实时算法 自由空间光通信 数字相干通信 波分复用 

分 类 号：O436[机械工程—光学工程]