Accession Number : ADD005494

Title :   Spatial-Multiplex, Spatial-Diversity Optical Communication Scheme.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON D C

Personal Author(s) : Deitz,Paul H ; Durfee,Gary L ; Wolff,Stephen S

Report Date : 18 Apr 1978

Pagination or Media Count : 12

Abstract : 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)

Descriptors :   *Patents, *Optical communications, Line of sight, Laser beams, Coding, Decoding, Optical detectors, Photomultiplier tubes

Subject Categories : Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE