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Optical Sources and Detectors
There are a number of light sources and photodetectors that could be for OWC systems. The most commonly used light sources used are the incoherent sources-light emitting diodes (LEDs) and coherent sources—laser diodes (LD). LEDs are mainly used for indoor applications. However, for short link (e.g., up to a kilometre) and moderate data rates, it is also possible to use LEDs in place of LDs. Lasers, because of their highly directional beam profile, are mostly employed for outdoor applications. Particularly for long transmission links, it is crucial to direct the energy of the information to be transmitted precisely in the form of a well-collimated laser beam. This is to limit the often still very large channel ...
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