High-speed visible light communication based on a III-nitride series-biased micro-LED array

Xie, Enyuan and He, Xiangyu and Islim, Mohamed Sufyan and Purwita, Ardimas and McKendry, Jonathan J. D. and Gu, Erdan and Haas, Harald and Dawson, Martin D. (2019) High-speed visible light communication based on a III-nitride series-biased micro-LED array. Journal of Lightwave Technology, 37 (4). pp. 1180-1186. ISSN 0733-8724

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    Abstract

    Visible light communication (VLC) using III-nitride light-emitting diodes (LEDs) offers many advantages such as license-free operation, high spatial diversity and innate security. In particular, micro-LEDs (μLEDs) are strong candidates for VLC due to their high modulation bandwidths. However, the low optical power of a single μLED is a key factor limiting VLC performance. In this paper, we report an optimized series-biased μLED array to achieve higher optical power while retaining high modulation bandwidth for high-speed VLC. An example array consisting of 3 × 3 40 μm-in-diameter μLED elements is presented here. At a current density of 3200 A/cm 2 in direct-current operation, the optical power and small signal 6-dB electrical modulation bandwidth of a blue-emitting series-biased μLED array are over 18.0 mW and 285 MHz, respectively. The data transmission capabilities of this μLED array are demonstrated by using on-off keying, pulse-amplitude modulation, and orthogonal frequency division multiplexing modulation formats over free space with the error-free data transmission rates of 1.95, 2.37, and 4.81 Gb/s, respectively.