适应三峡库区特殊地形的DP-DB FSO接入系统研究  

Research on DP-DB FSO access system for three gorges reservoir area with special landform

作　　者：龙颖 邵宇丰[1] 王安蓉[1] 胡钦政 雷国平[1] 刘毓[1] 胡政权[1] 王壮 杨杰 LONG Ying;SHAO Yu-feng;WANG An-rong;HU Qin-zheng;LEI Guo-ping;LIU Yu;HU Zheng-quan;WANG Zhuang;YANG Jie(College of Electronie and Informnation Engineering,Chongqing Three Gorges University,Chongqing 404100,China)

机构地区：[1]重庆三峡学院电子与信息工程学院,重庆404100

出　　处：《光电子．激光》2020年第7期773-778,共6页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(61107064);重庆市教委科学技术研究计划重大项目(KJZD-M201901201);重庆市基础研究与前沿探索项目(cstc2018JCYJax0038,cstc2016jcyjA0246,cstc2014jcyjA40046);重庆市高校创新团队建设计划项目(KJTD201320);重庆市教委科学技术研究计划(KJ1401005);重庆三峡学院研究生科研创新项目(020752539);重庆三峡学院优秀成果转化项目(18CGZH03);重庆市教委科技攻关项目青年项目(KJQN201801227)资助项目.

摘　　要：针对三峡库区的特殊地形,设计了一种适应三峡库区环境接入应用的偏振复用双二进制自由空间光接入系统。在天气较好条件下,10 Gb/s偏振复用双二进制信号在1 km自由空间光无线信道中成功进行了收发和传输。测试了该接入系统中两路偏振复用信号传输前后的光谱、眼图和误码率等指标,测试结果表明:10 Gb/s偏振复用双二进制信号在晴天条件下经1 km自由空间光无线信道传输后的接收眼图清晰可见,信号接收质量较高,并在误码率为10^-6情况下,测得经偏振解复用后解调还原的两路数据信号的最佳解调判决点分别为0.5 bit和0.51 bit,系统接收机灵敏度为-2.7 dBm,该接入系统方案具有良好的收发及传输性能。与常规接入通信方式相比,该方案不仅能够有效提升有限带宽内的信号光谱效率,还能在三峡库区的特殊地形区域实现"最后一公里"接入信号的自由空间高速无线传输。A polarization multiplexing duobinary free space optical access system is designed for the special terrain and landform access application in the Three Gorges reservoir area.Under good weather conditions,10 Gb/s polarization multiplexing duobinary signals can be successfully transmitted over the 1 km free space optical wireless link.Tested the optical spectrums,eye diagrams and bit error rate before and after transmission of two polarization multiplexing duobinary signals in this system.The results show that the receiving eye diagrams of the 10 Gb/s polarization multiplexed duobinary signal transmitted through the 1 km free space optical wireless channel in sunny conditions is clearly visible,the signal reception quality is high,and under the condition of 10^-6 bit error rate,the optimal demodulation decision points of the two data signals demodulated and restored after polarization demultiplexing are 0.5 bit and 0.51 bit respectively,the sensitivity of this system receiver is-2.7 dBm,so the access system scheme has good transceiver and transmission performance.Compared with conventional access methods,the scheme can not only effectively improve the optical spectral efficiency of the transmitted signals within the limited bandwidth,but also realize the free space high-speed wireless signals transmission within the "last 1 km access" in the Three Gorges reservoir especially geomorphologic area.

关 键 词：光通信 接入 双二进制 偏振复用 误码率 

分 类 号：TN915.6[电子电信—通信与信息系统]