Abstract

GaN-based light emitting diodes (LEDs) have potential as photodetectors (PDs) for visible light communication (VLC). In current studies on LED-based PDs, devices are operated in a reverse-biased or zero-biased state. In this work, the performance of an blue mini-LED as both a PD and light source was studied. An aluminum oxide passivation was deposited on the sidewalls of the active region using atomic-layer deposition. In addition to improving the external quantum efficiency of mini-LEDs and reducing leakage current, sidewall passivation can also increase the responsivity of mini-LED PD. At a bias of 3 V (corresponding to injection current of 11.5 mA), the mini-LED PD had a response of 0.243 A/W. Based on the system above, a VLC link over 1 m with a data rate of 528 Mbps is achieved using 16-ary quadrature amplitude modulation orthogonal frequency division multiplexing. Moreover, the mini-LED PD could simultaneously act as an uplink detector and a downlink transmitter in the same full-duplex VLC system. With transmission distance of 1 m/1 m, a transmission rate of 350 Mbps in the uplink and downlink was achieved. The proposed method allows the same mini-LED to be used simultaneously as a display and VLC transmitter and receiver, which not only simplifies the structure of the full-duplex communication system and reduces system power consumption, but also facilitates the integration of multifunctional small LED devices.

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Transfer-printed micro-LED and polymer-based transceiver for visible light communications

K. Rae, P. P. Manousiadis, M. S. Islim, L. Yin, J. Carreira, J. J. D. Mckendry, B. Guilhabert, I. D. W. Samuel, G. A. Turnbull, N. Laurand, H. Haas, and M. D. Dawson
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DCO-OTFS-based full-duplex relay-assisted visible light communications

Di Zheng, Hongming Zhang, and Jian Song
Opt. Express 29(25) 41323-41332 (2021)