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High-Bandwidth InGaN Self-Powered Detector Arrays toward MIMO Visible Light Communication Based on Micro-LED Arrays
journal contribution
posted on 2019-11-12, 17:47 authored by Xiaoyan Liu, Runze Lin, Honglan Chen, Shuailong Zhang, Zeyuan Qian, Gufan Zhou, Xinwei Chen, Xiaojie Zhou, Lirong Zheng, Ran Liu, Pengfei TianThis
work reports the use of the chip-based GaN-based micro-LED
(μLED) arrays for multifunctional applications as microdisplay,
data transmitters, photodetectors, and solar cells. The functions
of display and transmitter have been reported, and particularly, we
experimentally demonstrated that μLED arrays could be used as
self-powered, high-performance, and wavelength-selective photodetectors
(PDs), enabling high-speed multiple-input multiple-output (MIMO) visible
light communications (VLC) under on–off keying (OOK) modulation
scheme using 405 nm violet
laser diodes (LDs) as transmitters. The optoelectronic and communication
characteristics of the μLED-based PDs with diameters of 40,
60 and 100 μm were systematically studied. The optoelectronic
analysis shows superior performances of μLED-based PDs at a
405 nm wavelength compared with other previously reported GaN-based
PDs. Under a bias voltage of −5 V, the comparable peak responsivities
of 0.27, 0.31, and 0.24 A/W, specific detectivities of 1.1 ×
1011, 2.3 × 1012, and 2.1 × 1012 cm H1/2 W–1, and linear dynamic
ranges (LDRs) of 152, 162, and 164 dB were achieved for 40, 60, and
100 μm μLEDs, respectively. Even at zero-bias, that is,
self-powered mode, we have achieved high peak responsivities of 0.24,
0.29, and 0.21 A/W, high specific detectivities of 7.5 × 1012, 1.5 × 1013, and 1.3 × 1013 cm H1/2 W–1, and high LDR up to 186,
196, and 197 dB for 40, 60, and 100 μm μLEDs, respectively.
The μLEDs could also be used to harvest the optical energy of
the system, working as solar cells. The μLED-based PD arrays
were tested as receivers in the VLC system to implement high-speed
parallel communication, which yields maximum data rates of 180, 175,
and 185 Mbps for single 40, 60, and 100 μm μLED-based
PDs at a distance of 1 m with BERs of 3.5 × 10–3, 3.7 × 10–3, and 3.5 × 10–3, respectively. Furthermore, the 2 × 2 MIMO parallel VLC system
was achieved to increase the VLC data rate, which suggests the potential
of using large μLED-based PD arrays for multiple Gbps and even
Tbps VLC applications.
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Keywords
LDRVLC data ratetransmitter405 nm violet laser diodes100 μ m μ LEDsμ LED-based PDspeak responsivitiescommunicationμ LED-based PD arraysHigh-Bandwidth InGaN Self-Powered Detector Arrays100 μ m100 μ m μ LED-based PDsTbps VLC applicationsOOKLD405 nm wavelengthMIMO Visible Light Communicationμ LED arraysBERVLC system
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