Real-Time Multi-User Video Optical Wireless Transmission Based on a Parallel Micro-LEDs Bulb

IEEE Photonics Journal

Changyuan Yu¹  Zhongxu Liu¹  Chien-Ju Chen²  Meng-Chyi Wu²  Songping Mai³  Zixian Wei³  Faisal Nadeem Khan³  H. Y. Fu³  Zhaoming Wang³  Mutong Li³ 

[1] Department of Electronic and Information Engineering, The Hong Kong Polytechnic University, Kowloon, Hong Kong;Institute of Electronics Engineering, National Tsing Hua University, Hsinchu, Taiwan;Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen, China;

关键词: Visible light communication (VLC);    multi-user communication;    parallel micro-LEDs;    FPGA transceiver;   

DOI  :  10.1109/JPHOT.2021.3075701

来源: DOAJ

【 摘 要 】

In this work, we experimentally achieved a real-time video optical wireless transmission which can broadcast two users in different positions, simultaneously. Firstly, a single-pixel 50-μm micro-LED is designed and fabricated on a GaN-based wafer and then two micro-LED chips are connected as parallel form in a single bulb. The transceiver based on two FPGA boards is used to generate quadrature amplitude modulation-orthogonal frequency division multiplexed (QAM-OFDM) signals and measure the communication performance of the VLC system. The low-power micro-LEDs bulb emits 0.8 mW optical power through two optical paths at 20 mA driving current, and the modulation bandwidths for two users’ access are 90 MHz and 73 MHz, respectively. In this two-user real-time video transmission system, the total data rate exceeds 105.54 Mbps without naked eye discernable distortion over 2-m free-space distance. Different from traditional point-to-point links, this work demonstrates the possibility of flexible high-speed multi-user real-time video optical wireless transmission based on a parallel micro-LEDs bulb.

【 授权许可】

Unknown