10.5 Gbps Visible Light Communication Systems Based on <i>C</i>-Plane Freestanding GaN Micro-LED
Zhiwei Rao, Xinyi Shan, Guobin Wang, Zuxin Jin, Runze Lin, Xugao Cui, Ran Liu, Ke Xu, Pengfei Tian
Abstract
In this paper, 10.5 Gbps visible light communication systems based on a single c-plane freestanding GaN microLED are presented. We investigate the size effect on blue GaN-substrate micro-LED from optoelectronic properties to communication performance. Larger-size micro-LED can obtain higher light output power (LOP), but smaller-size micro-LED can achieve higher modulation bandwidth. An ultra-high -3 dB bandwidth of ∼ 2.3 GHz was obtained by 20 μm micro-LED. Meanwhile, we further improved the OFDM signal bandwidth to effectively utilize the high bandwidth of GaN-substrate microLED, and the maximum data rates of 20, 40, 60, 80, 100, and 300 μm micro-LEDs are 8.294, 8.394, 10.547, 10.019, 9.398, and 7.294 Gbps. 60 μm micro-LED has the potential to balance the LOP and bandwidth to achieve a record data rate of 10.547 Gbps, which is the highest data rate obtained by a single micro-LED to the best of our knowledge. Based on the optimum size of 60 μm micro-LED, extended distances of 0.5, 1, 5, and 10 m with data rates of 10.045, 9.668, 9.277, and 8.649 Gbps are also presented.