Abstract

As an important supplement to radio frequency (RF) communication in a crowded indoor environment, high-speed multi-user visible light communication (VLC) is a promising candidate for practical application compared with point-to-point architecture. In this work, an area division concept is proposed based on the multi-directional low-cost array transmitter. For the first time, a series of parallel mini/micro-LEDs transmitters with various chip sizes are designed, fabricated and packaged, which are used to build a multi-user VLC link. The size-dependent characteristics of the parallel mini/micro-LEDs transmitters for VLC are systematically analyzed, including the linearity, electroluminescence, impedance, achievable bandwidth and data rate. The proposed transmitters with active regions of 75 μm, 100 μm, 125 μm, 150 μm, and 175 μm can provide access bandwidths of 278 MHz, 190 MHz, 133 MHz, 104 MHz and 85 MHz at 50-mA driving current for two independent users over a 3-m link, accordingly. The VLC system based on the parallel 75-μm micro-LED transmitter can simultaneously support two independent users at different positions with a summing data rate of 2.6 Gbps by implementing pulse-amplitude modulation 4-level (PAM4) schemes with Volterra equalizer. The maximum distance-rate product of 7.8 Gbps·m exhibits superiority to accelerate the practical deployment of high-speed multi-user VLC.

Si-substrate vertical-structure InGaN/GaN micro-LED-based photodetector for beyond 10  Gbps visible light communication

Jianyang Shi, Zengyi Xu, Wenqing Niu, Dong Li, Xiaoming Wu, Ziwei Li, Junwen Zhang, Chao Shen, Guangxu Wang, Xiaolan Wang, Jianli Zhang, Fengyi Jiang, Shaohua Yu, and Nan Chi
Photon. Res. 10(10) 2394-2404 (2022)

1.3  GHz E-O bandwidth GaN-based micro-LED for multi-gigabit visible light communication

Lei Wang, Zixian Wei, Chien-Ju Chen, Lai Wang, H. Y. Fu, Li Zhang, Kai-Chia Chen, Meng-Chyi Wu, Yuhan Dong, Zhibiao Hao, and Yi Luo
Photon. Res. 9(5) 792-802 (2021)

Parallel micro-LED arrays with a high modulation bandwidth for a visible light communication

Sunan Yao, Huaqing Chai, Lei Lei, Zihe Zhu, Guoqiang Li, and Wenliang Wang
Opt. Lett. 47(14) 3584-3587 (2022)

Multi-user high-speed QAM-OFDMA visible light communication system using a 75-µm single layer quantum dot micro-LED

Zixian Wei, Li Zhang, Lei Wang, Chien-Ju Chen, Zhaoming Wang, Kai-Chia Chen, Meng-Chyi Wu, Yuhan Dong, Lai Wang, Yi Luo, and H. Y. Fu
Opt. Express 28(12) 18332-18342 (2020)

8.75 Gbps visible light communication link using an artificial neural network equalizer and a single-pixel blue micro-LED

Zixian Wei, Zhongxu Liu, Xin Liu, Lei Wang, Lai Wang, Changyuan Yu, and H. Y. Fu
Opt. Lett. 46(18) 4670-4673 (2021)