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Visible light communications (VLC) are an emerging technology that uses light-emitting diodes (LEDs) and photodiodes to provide high-speed communication between devices employing the visible light spectrum. Taking advantage of a large unregulated ...

LED is quite different from traditional light sources in terms of physical size, flux level, spectrum and spatial distribution. It is a big challenge for measuring LED's photometric parameters. This paper developed a multi-channel spectrometer and ...

In typical visible light communication VLC systems, light-emitting diodes LEDs are used as optical transmitters and photodiodes are used as optical receivers. Currently, many communication devices such as smart phones have a built-in LED lamp whereas ...