SEMINAR ON LASER COMMUNICATION : Lasers have been considered for space communications, as its implementation in 1960. Specific progress has been necessary for the operation of components and systems in particular, space-qualified hardware. The progress in system architecture, data design technology and components in the last three decades has been the laser communications in space is not only viable but also an interesting approach to these satellite link applications. data transfer requirements to perform the higher transmission speeds, the laser cross-link explosion of technology, the activities of global development, the increase in equipment and design maturity. The most important space laser communications has been the development of a reliable high-power, single mode diode laser as a directly modulated laser source. This technological advances offer space laser communication system designer the flexibility lightweight design, high bandwidth, communication payloads at low cost satellites, whose launch costs are very strong function of the shot put. This function greatly reduces the clogging of the field of vision of the most popular satellites. smaller antennas with a diameter usually less than 30 inches to create a less dynamic disturbance of sensitive satellite sensors. Less equipment required on board the long lifetime, it has less interference than the satellite heavier and larger RF systems. The narrow beam divergence, without interference and offers safe operation.
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