1 km 2.5 Gbit/s双向激光网桥视频通信  

Video Communication of 1 km 2.5 Gbit/s Bidirectional Laser Bridge

作　　者：张羽桐 赵江南[1] 艾勇[1] 梁赫西 胡仁杰 ZHANG Yu-tong;ZHAO Jiang-nan;AI Yong;LIANG He-xi;HU Ren-jie(Laser Communication Laboratory,Wuhan University,Wuhan 430072,China;Wuhan Liubo Photoelectric Technology Co.,Ltd.,Wuhan 430000,China)

机构地区：[1]武汉大学激光通信实验室,武汉430072 [2]武汉六博光电技术有限责任公司,武汉430000

出　　处：《光通信研究》2021年第4期32-35,55,共5页Study on Optical Communications

基　　金：2020武汉市企业技术创新资助项目(2020010602012047)。

摘　　要：针对远距离的激光接收对准问题,文章提出利用大面积雪崩光电二极管的激光网桥系统,用作广域网的延长以及局域网之间的连接。激光网桥系统的软件需要一台计算机作为服务器进行信息处理,硬件连接是经过交换机及电光转换,通过放置在两幢楼的两台双向激光镜头进行发射接收。这个系统采用1550 nm的近红外光,两幢大楼之间的距离约为1 km,而激光在这个条件下的几何损耗约为26 dB/km,调节两台激光器的相对位置直到两幢大楼接收的光功率在-30 dBm以内时,成功达到了两端视频通信所需的阈值光功率,因而可以进行双向视频通信。Aiming at the problem of long-distance laser receiving and alignment,a laser bridge system using large area avalanche photo diode is proposed in this paper,which can be used as the extension of Wide Area Network(WAN)and the connection between Local Area Networks(LAN).The software of the laser bridge system needs a computer as a server for information processing.The hardware connection is realized through the switch and electro-optic conversion,and based on two-way laser lenses placed in two buildings for transmitting and receiving signal.The distance between the two buildings is about 1 km,and the geometric loss of the laser is about 26 dB/km.By adjusting the relative position of the two lasers until the optical power received is less than-30 dBm,the threshold optical power required is realized,which can perform two-way video communication successfully.

关 键 词：激光 网桥 广域网延长 大面积雪崩光电二极管 

分 类 号：TN249[电子电信—物理电子学]