Multiuser protected optical data bus distribution systems

Details Multiuser protected optical data bus distribution systems Multiuser protected optical data bus distribution systems

1979-06-08

1980-12-02

Griffin, Robert L.

Multiplex communications

Wide area network

Packet switching

455606, 350 9613, 350 9623, 350 9633, 340555, G02B 514, G02B 516, G08B 1318

Patent

active

042375509

ABSTRACT:
An optical fiber having a center core and an outer core coaxial of the center core is coupled in a loop to a control station and a plurality of equally spaced users. The fiber propagates data time sequentially between the plurality of users on the center core in a given direction around the loop. A source of masking signal disposed in the control station is propagated on the outer core in a direction around the loop opposite to the given direction to prevent intercepting data on the fiber. The masking signal is turned off at a given time for a predetermined length of time to provide a window in the masking signal which arrives at each of the plurality of users in time sequence coincident with the data intended for each of the plurality of users to enable each of the plurality of users to recover the data intended therefore.

REFERENCES:
patent: 3919483 (1975-11-01), Gindi et al.
patent: 3919484 (1975-11-01), Maxemchuk
patent: 3943283 (1976-03-01), Caragliano
patent: 4086484 (1978-04-01), Steensma
patent: 4089584 (1978-05-01), Polczynski

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