Why is communication satellite used for long distance?
The high frequency radio waves used for telecommunications links travel by line of sight and so are obstructed by the curve of the Earth. The purpose of communications satellites is to relay the signal around the curve of the Earth allowing communication between widely separated geographical points.
What is optical satellite communication?
Optical satellite communication is a wireless telecommunication network that operates on optical frequency as a medium to deliver data signals at high bit-rate. Optical satellite communication uses free space as a medium for communication. The optical satellite consists of a transmitter, receiver, and channel.