| 摘要 |
A two way optical communication system comprises two light transmitter/receiver stations positioned at spaced apart locations and arranged to afford communication through free space therebetween, wherein one only of the two stations, hereinafter called the proximal station comprises a single leeam light transmission source 31, 32, and wherein the other of the two stations, hereinafter called the distal station, comprises retro-reflector means 42 and modulator means 41 utilised for the transmission of data from the distal station to the proximal station by reflecting a light carrier signal originating from the light transmission source back to a receiver at the proximal station, this retro-reflected carrier signal being modulated to carry the data, the distal station further including an optical detector 40. <IMAGE>
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