Bias point optimisation in LiFi for capacity enhancement

Zerihun Gutema, Tilahun and Haas, Harald and Popoola, Wasiu O. (2021) Bias point optimisation in LiFi for capacity enhancement. Journal of Lightwave Technology, 39 (15). pp. 5021-5027. ISSN 0733-8724 (https://doi.org/10.1109/JLT.2021.3083510)

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Abstract

In this paper, we investigate methods to optimise the bias point of an LED to benefit from increasing bandwidth at higher driving current while minimising the resulting signal distortion. The approaches are based on allowing for some nonlinear distortion or to reduce signal swing/signal-to-noise ratio while benefiting from higher bandwidth at higher driving currents. A framework is presented to estimate the attainable capacity under both conditions. We also experimentally validate the optimisation with a PAM-4 based VLC system. The experimental results show that for a 40 , mathrm{mA} dynamic range VLMB1500 LED used, the optimum bias point is not in the middle of the dynamic range but at 31 , mathrm{mA}.

  • Item type:Article
    ID code:79247
    Dates:
    Date
    Event
    31 August 2021
    Published
    25 May 2021
    Published Online
    17 May 2021
    Accepted
    Notes:© 2021 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting /republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
    Subjects:Science > Physics > Optics. Light
    Department:Faculty of Engineering > Electronic and Electrical Engineering
    Depositing user: Pure Administrator
    Date deposited:24 Jan 2022 15:00
    Last modified:20 Apr 2024 00:47
    Related URLs:
    URI:https://strathprints.strath.ac.uk/id/eprint/79247
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