TY - JOUR
T1 - Parallel Mini/Micro-LEDs Transmitter: Size-Dependent Effect and Gbps Multi-User Visible Light Communication
AU - Wei, Zixian
AU - Li, Mutong
AU - Liu, Zhongxu
AU - Wang, Zhaoming
AU - Zhang, Chao
AU - Chen, Chien Ju
AU - Wu, Meng Chyi
AU - Yang, Yanfu
AU - Yu, Changyuan
AU - Fu, H. Y.
N1 - This work was supported in part by the Science, Technology and Innovation Commission of Shenzhen Municipality under Grant WDZC20200820160650001, in part by the Guangdong Basic and Applied Basic Research Foundation under Grant 2021A1515011450, and in part by the Hong Kong Research Grants Council under Grant GRF15212720.
Publisher Copyright:
© 1983-2012 IEEE.
PY - 2022/4/15
Y1 - 2022/4/15
N2 - 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.
AB - 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.
KW - Area division
KW - multi-user communication
KW - parallel mini/micro-LEDs
KW - size-dependent effect
KW - visible light communication
UR - http://www.scopus.com/inward/record.url?scp=85122294680&partnerID=8YFLogxK
U2 - 10.1109/JLT.2021.3138626
DO - 10.1109/JLT.2021.3138626
M3 - Journal article
AN - SCOPUS:85122294680
SN - 0733-8724
VL - 40
SP - 2329
EP - 2340
JO - Journal of Lightwave Technology
JF - Journal of Lightwave Technology
IS - 8
ER -