电子学报 ›› 2022, Vol. 50 ›› Issue (1): 45-53.DOI: 10.12263/DZXB.20210244

• 无线光通信及其组网技术 • 上一篇    下一篇

基于可见光通信技术的全双工以太网通信系统设计

卢霆威1, 王泽平1, 刘梦1, 刘青青2, 陈兵3, 林岳1, 吴挺竹1, 陈忠1   

  1. 1.厦门大学电子科学与技术学院,福建 厦门 361005
    2.中国移动通信集团福建有限公司厦门分公司,福建 厦门 361005
    3.福建越众科技发展有限公司,福建 福州 350000
  • 收稿日期:2021-02-05 修回日期:2021-06-11 出版日期:2022-01-25 发布日期:2022-01-25
  • 作者简介:卢霆威 男,1997年11月出生,福建三明人.现为厦门大学大学电子科学与技术学院在读硕士生.主要研究方向为可见光通信技术. E-mail:33320191150296@stu.xmu.edu.cn
    吴挺竹(通信作者) 男,1985年12月出生,福建宁德人.现为厦门大学电子科学与技术学院副教授,研究生导师.主要研究方向为可见光通信技术、Micro-LED全彩化显示等. E-mail:wutingzhu@xmu.edu.cn
  • 基金资助:
    国家自然科学基金(11904302);厦门市重大科技项目(3502Z20191015)

Full-Duplex Indoor Ethernet Communication System Based on Visible Light Communication

LU Ting-wei1, WANG Ze-ping1, LIU Meng1, LIU Qing-qing2, CHEN Bing3, LIN Yue1, WU Ting-zhu1, CHEN Zhong1   

  1. 1.School of Electronic Science and Engineering,Xiamen University,Xiamen,Fujian 361005,China
    2.Xiamen Branch of China Mobile Communications Group Fujian Co. ,Ltd. ,Xiamen,Fujian 361005,China
    3.Fujian Yue Zhong Science and Technology Development Co. ,Ltd. ,Fuzhou,Fujian 350000,China
  • Received:2021-02-05 Revised:2021-06-11 Online:2022-01-25 Published:2022-01-25

摘要:

利用可见光通信技术来传输以太网信号能够克服传统无线通信速率低、频谱资源紧张、使用场景受限等缺点.针对传统的可见光通信系统难以实现高速以太网通信的问题,本文设计了满足以太网技术要求的全双工可见光通信系统.系统主要包括以太网接口处理电路、差分转单端、单端转差分电路、光源驱动电路、光电检测电路,上、下行链路都采用可见光通信技术对以太网信号进行透明传输,无须调制即可实现高速以太网通信.经测试,本系统可在通信距离为10 m的情况下实现100 Mbps以太网的全双工通信.

长摘要
本文设计了满足以太网技术要求的全双工可见光通信系统。系统主要包括以太网接口处理电路、差分转单端电路、单端转差分电路、光源驱动电路、光电检测电路,上、下行链路都采用可见光通信技术对以太网信号进行透明传输,无须调制即可实现高速以太网通信。系统采用高带宽的红色激光器作为上下行链路的发射光源来传输信号。接收端则采用对短波长光响应速度快、灵敏度高的雪崩光电二极管作为光电探测器,并在探测器前加入透镜来汇聚光线,以增加通信距离。该系统由近端、远端两个部分组成,近端以连接到网络运营商的以太网光猫作为终端来发送和接收数据,而远端则连接家用设备进行数据的上传和下载。本设计中,光源驱动电路的主要功能是将信号加载至光源上,实现电信号到光信号的转换,光电检测电路中采用APD作为光电检测器将光信号转化为电信号,差分转单端电路将以太网信号转化为可加载到光源上的单端信号,单端转差分电路将单端信号还原为设备可识别的双端以太网信号。通过搭建实验平台,在实地测试的情况下实现了通信距离为10 m的100 Mbps以太网全双工通信,可以实现家庭数字网络电视、电脑等数字终端的高速远距离联网通信。

关键词: 可见光通信, 以太网, 激光传输, 全双工通信, 硬件电路

Abstract:

Using visible light communication technology to transmit Ethernet signals can overcome the disadvantages of traditional wireless communication, such as low communication rate, tight spectrum resources and restricted application scenarios. Aiming at the problem that the traditional visible light communication system is difficult to realize the bidirectional Ethernet communication, this paper designs a full duplex visible light communication system to meet the technical requirements of Ethernet. This system mainly includes Ethernet extraction circuit, differential to single-ended circuit, single-ended to differential circuit, drive circuit and photoelectric detection circuit. Visible light communication technology is used to transmit Ethernet signals transparently in the both uplink and downlink of the system, which can realize high-speed communication without modulation. The experimental results show that the system can realize 100Mbps Ethernet full duplex communication under the condition of 10 meters communication distance.

Extended Abstract
This paper designs a full duplex visible light communication system that meets the technical requirements of Ethernet. The system mainly includes Ethernet interface processing circuit, differential to single end circuit, single end to differential circuit, light source drive circuit, photoelectric detection circuit. Visible light communication technology is used for transparent transmission of Ethernet signals in both uplink and downlink, and high-speed Ethernet communication can be realized without modulation. The system uses a high bandwidth red laser as the transmission light source for uplink and downlink to transmit signals. At the receiving end, avalanche photodiode with fast response to short wavelength light and high sensitivity is used as the photodetector, and a lens is added in front of the detector to gather light to increase the communication distance. The system consists of a near end and a far end. The near end uses the Ethernet Optical Cat connected to the network operator as the terminal to send and receive data, while the far end connects the household equipment to upload and download data. In this design, the main function of the light source driving circuit is to load the signal onto the light source to realize the conversion of electrical signal to optical signal. In the photoelectric detection circuit, APD is used as the photoelectric detector to convert the optical signal into electrical signal. The differential to single ended circuit converts the Ethernet signal into a single ended signal that can be loaded onto the light source. The single ended to differential circuit restores the single ended signal to a double ended Ethernet signal that can be recognized by the equipment. By building an experimental platform, 100 Mbps Ethernet full duplex communication with a communication distance of 10 m is realized under the condition of field test, which can realize high-speed long-distance networking communication of digital terminals such as home digital network TV and computer.

Key words: visible light communication, Ethernet, laser transmission, full duplex communication, hardware circuit

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