Secure optical multiplex communication system
AssigneeInternational Telephone and Telegraph Corporation
InventorPeter Dennis Steensma
Life of this patent
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Abstract
The communication system includes a holographic system to provide a plurality of spatially multiplexed optical beams each modulated by a different one of a plurality of binary intelligence signals. The plurality of modulated spatially multiplexed optical beams are coherently transmitted on an optical waveguide to a hologram and an array of photosensors to recover each of the intelligence signals. The waveguide may be an optical fiber of the parabolic index type to coherently transmit all of the plurality of modulated spatially multiplexed optical beams, or a plurality of single mode step index optical fibers each coherently transmitting a different one of the plurality of modulated spatially multiplexed optical beams.
Claims10
A secure optical multiplex communication system comprising:
- a plurality of sources of intelligence signals to be multiplexed and transmitted;
- a holographic system having at its output a given hologram on a first photographic plate, said holographic system being coupled to said plurality of sources to provide a plurality of spatially multiplexed optical beams on said first photographic plate each modulated by a different one of said signals of said plurality of sources;
- an optical waveguide having one end thereof optically coupled to said first photographic plate for coherent transmission of said plurality of modulated spatially multiplexed optical beams to the other end of said waveguide;
- a second photographic plate having said given hologram thereon optically coupled to said other end of said waveguide to reconstruct each of said plurality of modulated spatially multiplexed optical beams;
- and
- an array of photosensors optically coupled to said second photographic plate to recover each of said signals of said plurality of sources from said reconstructed plurality of modulated spatially multiplexed optical beams.
Dependencies are inferred from the claim text.