We examine the practicability of the visible-light communication (VLC) transceiver for bidirectional high-speed and short-range communications. A visible-light peripheral interface could be a novel approach, visualizing the veiled security feature of light by employing visible lights as communication media beyond its intended applications, such as illumination and display. The proposed VLC transceivers are implemented with edge-an emitting laser diode and a silicon photodiode, which is primarily designed to operate in a full duplex mode at 120 Mbit/s. The shielding method that is employed to reduce the light cross-coupling effect inside the VLC transceiver is proposed and experimentally investigated. The bit error rate performance of the proposed VLC transceiver is examined with respect to the transmission distance and the coverage.
The rapid improvement in the efficiency of solid-state lighting has led to predictions that it will be the dominant source
used for most indoor lighting applications in the future. At present an attractive candidate for generating white-light are
blue LEDs that excite a yellow phosphor, with a resultant colour emission. Such solid state sources can be used for both
illumination and communications simultaneously, offering the possibility of creating wireless broadcasting within a
room or office space.
In this paper we outline a typical basic configuration, and the performance available using simple modulation schemes.
Unmodified LEDs typically have modulation bandwidths of several MHz, but typical lighting levels provide a
communications channel with a Signal to Noise Ratios in excess of 40dB. Techniques such as equalisation can be used
to improve available data rate significantly, and in this paper we outline several approaches that have the potential to
offer data rates of 100Mb/s and above.
This research represents the first effort to apply vertical cavity surface emitting lasers (VCSELs) to the monitoring of interferometric fiber optic sensors. Spectral characteristics were measured for 850nm VCSELs to determine the combination of dc bias current, modulation current amplitude and modulation frequency for which single mode VCSEL operation and regular fringe patterns are achieved. The performance of 850nm VCSEL/FFPI systems was compared with their counterparts using 1300nm distributed feedback (DFB) lasers.
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