Spatial-Multiplex, Spatial-Diversity Optical Communication Scheme.
DEPARTMENT OF THE ARMY WASHINGTON D C
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An optical communications system for coding, transmitting, receiving, and decoding digital message signals is described. A beam from a coherent optical source, such as a laser, is transmitted through an aperture in which there is disposed a random phase screen, e.g., ground glass. One or more isometric bar gratings containing the coded message data in a particular amplitude distribution pattern are disposed adjacent to the ground glass in the optical transmission path. The ground glass, phase screen, introduces a random coding to the message bit. At the receiver a plurality of point detectors sense the signals to facilitate subsequent decoding of the message. Author
- Non-Radio Communications