5 Gbps optical wireless communication using commercial SPAD array receivers

Huang, Shenjie and Chen, Cheng and Bian, Rui and Haas, Harald and Safari, Majid (2022) 5 Gbps optical wireless communication using commercial SPAD array receivers. Optics Letters, 47 (9). pp. 2294-2297. ISSN 0146-9592 (https://doi.org/10.1364/OL.454994)

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Abstract

Photon counting detectors such as single-photon avalanche diode (SPAD) arrays can be used to improve the sensitivity of optical wireless communication (OWC) systems. However, the achievable data rate of SPAD-based OWC systems is strongly limited by the nonlinearity induced by the SPAD dead time. In this work, the performance of a SPAD-based OWC system with orthogonal frequency division multiplexing (OFDM) is investigated and compared with that of on-off keying (OOK). We employ nonlinear equalization, peak-toaverage power ratio optimization by adjusting the OFDM clipping level, and adaptive bit and energy loading to achieve a record experimental data rate of 5 Gbps. The contrasting optimal regimes of operation of the two modulation schemes are also demonstrated.

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