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Optimized photoelectric receiver to enhance modulation bandwidth of visible light communication system

机译：优化的光电接收器以增强可见光通信系统的调制带宽

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摘要

In the visible light communication (VLC) system which combines lighting and communication functions, the 3-dB modulation bandwidth is mainly limited by the light-emitting diode (LED) suffered high-frequency response attenuation. An optimized photoelectric receiver was proposed to enhance the 3-dB modulation bandwidth. The frequency response of the photoelectric receiver was derived. Theoretical analysis predicted that a gain peak would appear in the high-frequency response of the photoelectric receiver. The value of the gain and the frequency point of the gain peak can be adjusted by selecting appropriate values of feedback resistor and capacitor. Then, the measurement platform of 3-dB modulation bandwidth for blue-LED VLC system was established. Experimental measurements demonstrated that the photoelectric receiver with proper sets of feedback resistor and capacitor can compensate the high-frequency response attenuation of a normal LED. The 3-dB modulation bandwidth obtains 56% enhancement if the photoelectric receiver was replaced from a commercial one to our optimized design. In order to further expand the 3-dB modulation bandwidth, an equalization circuit consists of two-stage transistor amplifier and an emitter-follower was introduced to suppress the low-frequency response. The 3-dB modulation bandwidth for the VLC system with our optimized photoelectric receiver can be expanded to 241 or 281 MHz, while the circuit was, respectively, arranged as pre-equalization or post-equalization.
机译：在结合照明和通信功能的可见光通信（VLC）系统中，3-dB调制带宽主要受遭受高频响应衰减的发光二极管（LED）的限制。提出了一种优化的光电接收器来增强3 dB的调制带宽。推导了光电接收器的频率响应。理论分析预测，增益峰值将出现在光电接收器的高频响应中。增益值和增益峰值的频率点可以通过选择适当的反馈电阻器和电容器值来调整。然后，建立了蓝光LED VLC系统3 dB调制带宽的测量平台。实验测量表明，带有适当的反馈电阻器和电容器组的光电接收器可以补偿普通LED的高频响应衰减。如果将光电接收器从商业产品替换为我们的优化设计，则3 dB调制带宽可获得56％的增强。为了进一步扩展3 dB的调制带宽，均衡电路由两级晶体管放大器组成，并引入了射极跟随器以抑制低频响应。带有我们优化的光电接收器的VLC系统的3 dB调制带宽可以扩展到241或281 MHz，而电路分别以预均衡或后均衡的形式布置。

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  • 来源
    《Optical and quantum electronics》 |2018年第1期|43.1-43.12|共12页
  • 作者

    Huamao Huang; Xin Xie; Rulian Wen; Zeliang Chen; Chao Wang; Hong Wang;

  • 作者单位

    Engineering Research Center for Optoelectronics of Guangdong Province, School of Physics and Optoelectronics, South China University of Technology, Guangzhou, China,Guangzhou Institute of Modern Industrial Technology, Guangzhou, China;

    Engineering Research Center for Optoelectronics of Guangdong Province, School of Physics and Optoelectronics, South China University of Technology, Guangzhou, China;

    Engineering Research Center for Optoelectronics of Guangdong Province, School of Physics and Optoelectronics, South China University of Technology, Guangzhou, China;

    Engineering Research Center for Optoelectronics of Guangdong Province, School of Physics and Optoelectronics, South China University of Technology, Guangzhou, China;

    Engineering Research Center for Optoelectronics of Guangdong Province, School of Physics and Optoelectronics, South China University of Technology, Guangzhou, China;

    Engineering Research Center for Optoelectronics of Guangdong Province, School of Physics and Optoelectronics, South China University of Technology, Guangzhou, China,Guangzhou Institute of Modern Industrial Technology, Guangzhou, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Light-emitting diode; Visible light communication; Modulation bandwidth; Photoelectric receiver;

    机译：发光二极管;可见光通讯;调制带宽;光电接收器;

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