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Fiber-Optic Loop Bypass Via Dual Source Coupling

IP.com Disclosure Number: IPCOM000041972D
Original Publication Date: 1984-Mar-01
Included in the Prior Art Database: 2005-Feb-03
Document File: 2 page(s) / 46K

Publishing Venue

IBM

Related People

Balliet, L: AUTHOR [+2]

Abstract

A passive bypass is provided for processors or terminals interconnected in a loop by eliminating fiber switches and T couplers. The normal method of providing a bypass for processors or terminals connected in a loop is to employ an electromechanical or optical bypass switch. The required type of switch is generally difficult to build and is costly and unreliable. The switch can be eliminated by using a coupler. The arrangement proposed herein provides an alternate scheme for solving the same problem without using a T coupler. The host interface circuits N-1, N and N+1, etc., and host operation are generally well known. The improvement consists of coupling two fibers from the driver source rather than a single fiber as has been done previously.

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Fiber-Optic Loop Bypass Via Dual Source Coupling

A passive bypass is provided for processors or terminals interconnected in a loop by eliminating fiber switches and T couplers. The normal method of providing a bypass for processors or terminals connected in a loop is to employ an electromechanical or optical bypass switch. The required type of switch is generally difficult to build and is costly and unreliable. The switch can be eliminated by using a coupler. The arrangement proposed herein provides an alternate scheme for solving the same problem without using a T coupler. The host interface circuits N-1, N and N+1, etc., and host operation are generally well known. The improvement consists of coupling two fibers from the driver source rather than a single fiber as has been done previously. An edge-emitting light source (not shown), because of its emission pattern, can be utilized without diminishing the coupling efficiency. The light signal power in each of the dual coupled fibers is approximately equal to the light signal power in a single coupled fiber. Fig. 1 identifies the two fiber cables as cable A and cable B. Cable A provides the normal interconnection path between a station and the next station in the loop. Cable B provides the bypass of any given station. Assume that station N in the figure has failed. The failure is detected by station N+1 since no data or erroneous data is detected at receiver 1. The host then processes data received at receiver 2 v...