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  • Received: Nov. 26, 2018

    Accepted: May. 2, 2019

    Posted: Jun. 21, 2019

    Published Online: Jun. 21, 2019

    The Author Email: Erdan Gu (erdan.gu@strath.ac.uk)

    DOI: 10.1364/PRJ.7.000B41

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    Xiangyu He, Enyuan Xie, Mohamed Sufyan Islim, Ardimas Andi Purwita, Jonathan J. D. McKendry, Erdan Gu, Harald Haas, Martin D. Dawson. 1 Gbps free-space deep-ultraviolet communications based on III-nitride micro-LEDs emitting at 262 nm[J]. Photonics Research, 2019, 7(7): B41-B47

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Photonics Research, Vol. 7, Issue 7, B41-B47 (2019)

1 Gbps free-space deep-ultraviolet communications based on III-nitride micro-LEDs emitting at 262 nm 

Xiangyu He1,†, Enyuan Xie1,†, Mohamed Sufyan Islim2,†, Ardimas Andi Purwita2, Jonathan J. D. McKendry1, Erdan Gu1,*, Harald Haas2, and Martin D. Dawson1

Author Affiliations

  • 1Institute of Photonics, Department of Physics, University of Strathclyde, Glasgow G1 1RD, UK
  • 2Li-Fi R&D Centre, the University of Edinburgh, Institute for Digital Communications, Edinburgh EH9 3JL, UK

Abstract

The low modulation bandwidth of deep-ultraviolet (UV) light sources is considered as the main reason limiting the data transmission rate of deep-UV communications. Here, we present high-bandwidth III-nitride micro-light-emitting diodes (μLEDs) emitting in the UV-C region and their applications in deep-UV communication systems. The fabricated UV-C μLEDs with 566 μm2 emission area produce an optical power of 196 μW at the 3400 A/cm2 current density. The measured 3 dB modulation bandwidth of these μLEDs initially increases linearly with the driving current density and then saturates as 438 MHz at a current density of 71 A/cm2, which is limited by the cutoff frequency of the commercial avalanche photodiode used for the measurement. A deep-UV communication system is further demonstrated. By using the UV-C μLED, up to 800 Mbps and 1.1 Gbps data transmission rates at bit error ratio of 3.8×103 are achieved assuming on-off keying and orthogonal frequency-division multiplexing modulation schemes, respectively.