Photonic local/metropolitan area network

Details Photonic local/metropolitan area network Photonic local/metropolitan area network

1989-02-23

1990-11-13

Olms, Douglas W.

Multiplex communications

Wide area network

Packet switching

370 941, 370 4, 370 15, H04J 326, H04J 1408

Patent

active

049707175

ABSTRACT:
With this invention, collisions of optical packets in local area networks are avoided. Briefly, each branch of a local area network topology, such as a star, a ring or a bus is provided with an optical path having two substantially parallel optical fibers which can be selectively configured to form either a direct straight through path or a loop-back path. Prior to advancing a packet to the next occurring branch, a test is made to determine if it is occupied. If it is not occupied, the packet is advanced along one of the opitcal fibers of the optical path. If it is occupied, then the two optical fibers are rapidly configured to form a loop-back path and the packet travels around the loop-back path, again and again as required until the danger of a collison with a preceding packet no longer exists.

REFERENCES:
patent: 4674085 (1987-06-01), Aranguran et al.
patent: 4797589 (1989-01-01), Collins
patent: 4829512 (1989-05-01), Nakai et al.
patent: 4835763 (1989-05-01), Lau
patent: 4847837 (1989-07-01), Morales et al.

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