Optimum device and modulation scheme selection for optical wireless communications

Chun, Hyunchae and Rajbhandari, Sujan and Faulkner, Graheme and Xie, Enyuan and McKendry, Jonathan J. D. and Gu, Erdan and Dawson, Martin D. and O'Brien, Dominic (2021) Optimum device and modulation scheme selection for optical wireless communications. Journal of Lightwave Technology, 39 (8). pp. 2281-2287. ISSN 0733-8724

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    Abstract

    There has been an extensive modelling of the optical wireless channel, and the optimum modulation scheme for a particular channel is well-understood. However, this modelling has not taken into account the trade-offs that transmitter and receiver selection usually involve. For a particular type of transmitter, the modulation bandwidth and available power are closely related, as are receiver bandwidth, active area and sensitivity. In this article, we present a design approach that takes this device selection into account. The article details a general design method for an optical wireless communication system using a holistic design approach (i.e., considering channel, modulation schemes, and device constraints). The article shows results for particular examples, showing a substantial increase in margin (or data-rate) is available using this approach. For instance, by using this approach mutually optimising both modulation schemes and device constraints, it is found that for an optimally chosen Gallium Nitride micro-LED and a commercial photo receiver pair, a 20 dB SNR margin (or ∼3 times data-rate improvement) can be obtained compared with a more typical approach mainly concerning the modulation scheme optimisation.

    ORCID iDs

    Chun, Hyunchae, Rajbhandari, Sujan, Faulkner, Graheme, Xie, Enyuan ORCID logoORCID: https://orcid.org/0000-0001-7776-8091, McKendry, Jonathan J. D. ORCID logoORCID: https://orcid.org/0000-0002-6379-3955, Gu, Erdan ORCID logoORCID: https://orcid.org/0000-0002-7607-9902, Dawson, Martin D. ORCID logoORCID: https://orcid.org/0000-0002-6639-2989 and O'Brien, Dominic;