• Photonics Research
  • Vol. 7, Issue 7, B41 (2019)
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
  • show less
    DOI: 10.1364/PRJ.7.000B41 Cite this Article Set citation alerts
    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 Copy Citation Text show less
    Simplified cross-sectional schematic of a single UV-C μLED presented in this work. Dimensions are not to scale.
    Fig. 1. Simplified cross-sectional schematic of a single UV-C μLED presented in this work. Dimensions are not to scale.
    (a) Plan view optical image of the fabricated UV-C μLED array presented in this work and (b) a high-magnification image of the μLEDs.
    Fig. 2. (a) Plan view optical image of the fabricated UV-C μLED array presented in this work and (b) a high-magnification image of the μLEDs.
    J−V and L−J characteristics of a UV-C μLED. The inset shows the emission spectrum of a UV-C μLED at 1768 A/cm2.
    Fig. 3. JV and LJ characteristics of a UV-C μLED. The inset shows the emission spectrum of a UV-C μLED at 1768  A/cm2.
    (a) The 3 dB electrical modulation bandwidth of the UV-C μLED as a function of current density; small signal frequency responses of the UV-C μLED at (b) 18 and (c) 71 A/cm2.
    Fig. 4. (a) The 3 dB electrical modulation bandwidth of the UV-C μLED as a function of current density; small signal frequency responses of the UV-C μLED at (b) 18 and (c) 71  A/cm2.
    Schematic diagram and optical image of the experimental setup for deep-UV communication using the fabricated UV-C μLED.
    Fig. 5. Schematic diagram and optical image of the experimental setup for deep-UV communication using the fabricated UV-C μLED.
    (a) Normalized number of occurrences of transmitted and received symbols assuming the OOK modulation scheme at 800 Mbps and (b) the eye diagram of received symbols assuming the same measurement conditions using the UV-C μLED.
    Fig. 6. (a) Normalized number of occurrences of transmitted and received symbols assuming the OOK modulation scheme at 800 Mbps and (b) the eye diagram of received symbols assuming the same measurement conditions using the UV-C μLED.
    (a) Measured SNR versus bandwidth for OFDM at JDC=1770 A/cm2 and VPP=7 V. M-QAM constellation symbols received at the photodetector after equalization for M=4, 8, 16 are inserted. (b) Data transmission rate versus BER for OFDM measurement at JDC=1770 A/cm2 and VPP=7 V.
    Fig. 7. (a) Measured SNR versus bandwidth for OFDM at JDC=1770  A/cm2 and VPP=7  V. M-QAM constellation symbols received at the photodetector after equalization for M=4, 8, 16 are inserted. (b) Data transmission rate versus BER for OFDM measurement at JDC=1770  A/cm2 and VPP=7  V.
    Light SourceModulation SchemeTransmission PowerChannel LengthData RateBERRef.
    265 nm mercury-xenon lampPPM25 W1.6 km1.2 Mbps[8]
    253 nm mercury-argon lampPPM5 W0.5 km10 kbps105[9]
    254 nm low-pressure mercury lampFSK6 m1.2 kbps104[6]
    265 nm LED arraysOOK/PPM43 mW10 m2.4 kbps104[7]
    294 nm LEDOFDM190 μW0.08 m71 Mbps3.8×103[10]
    280 nm LEDPAM-41.5 m1.6 Gbps2.0×102[3]
    262 nm μLEDOFDM196 μW0.3 m1.1 Gbps3.8×103This work
    Table 1. Comparison of Deep-UV Communication Results from the Literature, and from This Work
    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
    Download Citation