Local area network optical fiber data communication

Details Local area network optical fiber data communication Local area network optical fiber data communication

1980-07-29

1982-12-28

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

455612, 350 9615, 350 9616, H04J 1500, H04B 900

Patent

active

043665659

ABSTRACT:
A method and apparatus are disclosed for high speed multiaccess data communication using guided wave components and angular division multiplexing for parallel optical signal transmission over a multimode optical fiber. A receiver at each station in the network comprises an optical coupler/demultiplexer, a pulse regenerator, an optical processor and detectors. The transmitter at each station comprises an array of lasers, a switching matrix for controlling emissions into the optical fiber and a multiplexer/coupler for coupling the laser emissions to the multimode optical fiber. The optical processor is directly coupled to the switching matrix. Preferably, the multiplexer/coupler comprises a graded-index planar lens, one major surface of which abuts the optical fiber and the other major surface of which is contacted by a plurality of single mode waveguides from the different lasers of the transmitter. As a result, the single mode signals introduced into the lens at different radial distances are coupled to different modal groups propagating in the optical fiber. The coupler/demultiplexer preferably comprises a graded-index lens and an array of concentric half-ring lasers. Annular cones of radiation propagating in the optical fiber are focused to an array of concentric rings near the half-ring lasers where they are converted into linear beams propagating in single mode guided wave structures.

REFERENCES:
patent: 3157726 (1964-11-01), Hicks et al.
patent: 3633034 (1972-01-01), Uchida
patent: 3761716 (1973-09-01), Kapron et al.
patent: 3874780 (1975-04-01), Love
patent: 3919484 (1975-11-01), Maxemchuk
patent: 4262171 (1981-04-01), Schneider et al.

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