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Proceedings Paper

Advanced LiFi technology: Laser light
Author(s): Changmin Lee; Mohamed Sufyan Islim; Stefan Videv; Adrian Sparks; Binith Shah; Paul Rudy; Melvin McLaurin; Harald Haas; James Raring
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Paper Abstract

We demonstrate high-speed LiFi data communication of over 20 Gbit/s using visible light from a laser-based white light emitting surface mount device (SMD) product platform that offers 10-100X the brightness of conventional LED sources. Equipped with high power blue laser diodes that offer over 3.5 GHz of 3 dB bandwidth, the laser-based white light SMD modules exhibited a signal-to-noise ratio (SNR) above 15 dB up to 1 GHz. The high SNR was combined with high order quadrature amplitude modulation (QAM) and orthogonal frequency division multiplexing (OFDM) to maximize the bandwidth efficiency. In this work, we present a laser based white light SMD module configured with a single 3W blue laser diode mounted on heat-sink, optically coupled to a collimating optic, achieving a LiFi data rate of up to 10 Gbit/s. Moreover, we demonstrate wavelength division multiplexing (WDM), from a white light SMD module configured with two blue laser diodes separated in peak wavelength to serve as separate communication channels. Using WDM, the dual laser SMD module enabled LiFi data rates of over 20 Gbit/s by simultaneously transmitting data over both channels.

Paper Details

Date Published: 25 February 2020
PDF: 8 pages
Proc. SPIE 11302, Light-Emitting Devices, Materials, and Applications XXIV, 1130213 (25 February 2020); doi: 10.1117/12.2537420
Show Author Affiliations
Changmin Lee, SLD Laser, Inc. (United States)
Mohamed Sufyan Islim, The Univ. of Edinburgh (United Kingdom)
Stefan Videv, The Univ. of Edinburgh (United Kingdom)
Adrian Sparks, The Univ. of Edinburgh (United Kingdom)
Binith Shah, SLD Laser, Inc. (United States)
Paul Rudy, SLD Laser, Inc. (United States)
Melvin McLaurin, SLD Laser, Inc. (United States)
Harald Haas, The Univ. of Edinburgh (United Kingdom)
James Raring, SLD Laser, Inc. (United States)

Published in SPIE Proceedings Vol. 11302:
Light-Emitting Devices, Materials, and Applications XXIV
Jong Kyu Kim; Michael R. Krames; Martin Strassburg, Editor(s)

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