04-04-2017, 12:06 PM
Optical communication, also known as optical telecommunication, is remote communication using light to convey information. It can be done visually or by electronic devices. The first basic forms of optical communication go back several millennia, while the first electrical device created to do so was the photometer, invented in 1880. An optical communication system uses a transmitter, which encodes a message in an optical signal, a channel , Which carries the signal to its destination, and a receiver, which reproduces the message from the received optical signal. When electronic equipment is not used, the "receiver" is a person who visually observes and interprets a signal, which may be simple (such as the presence of a light beacon) or complex (such as lights using colour codes or showing A Morse code sequence). Optical communication in free space has been deployed in space, while terrestrial forms are naturally limited by geography, climate and the availability of light.
