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Open Access research with a European policy impact...

The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by Strathclyde researchers, including by researchers from the European Policies Research Centre (EPRC).

EPRC is a leading institute in Europe for comparative research on public policy, with a particular focus on regional development policies. Spanning 30 European countries, EPRC research programmes have a strong emphasis on applied research and knowledge exchange, including the provision of policy advice to EU institutions and national and sub-national government authorities throughout Europe.

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CMOS-integrated GaN LED array for discrete power level stepping in visible light communications

Griffiths, Alexander D. and Islim, Mohamed Sufyan and Herrnsdorf, Johannes and McKendry, Jonathan J. D. and Henderson, Robert and Haas, Harald and Gu, Erdan and Dawson, Martin D. (2017) CMOS-integrated GaN LED array for discrete power level stepping in visible light communications. Optics Express, 25 (8). pp. 338-345. ISSN 1094-4087

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Abstract

We report a CMOS integrated micro-LED array capable of generating discrete optical output power levels. A 16 x 16 array of individually addressable pixels are on-off controlled through parallel logic signals. With carefully selected groups of LEDs driven together, signals suitable for discrete transmission schemes are produced. The linearity of the device is assessed, and data transmission using pulse amplitude modulation (PAM) and orthogonal frequency division multiplexing (OFDM) is performed. Error-free transmission at a symbol rate of 100 MSamples/s is demonstrated with 4-PAM, yielding a data rate of 200 Mb/s. For 8-PAM, encoding is required to overcome the baseline wander from the receiver, reducing the data rate to 150 Mb/s. We also present an experimental proof-of-concept demonstration of discrete-level OFDM, achieving a spectral efficiency of 3.96 bits/s/Hz.