WDM for High-Speed Indoor Visible Light Communication System

Achieving high data rate is one of the primary goals of visible light communication (VLC) systems. This paper introduces a VLC system based wavelength division multiplexing (WDM) to achieve a high data rate. In this work, red, yellow, green and blue (RYGB) laser diodes (LDs) are used as transmitters to obtain high modulation bandwidth and an imaging diversity receiver (IMDR) is used as an optical receiver. Based on the location of the IMDR, each colour of the RYGB LDs sends a different data stream at a different rate. Each pixel of the IMDR is covered by a specific colour optical filter. In this work, a multispectral colour filter array (MCFA) is assumed to design the pattern of the array colour filters of the IMDR. In this paper, we consider the effect of the diffusing reflections and mobility on the performance of the proposed system. This system can achieve an aggregate data rate of 10 Gb/s over the entire proposed room with bit error rate (BER) = 10-6 and a simple modulation technique: on-off-keying (OOK).