System of detecting troubles of an optical communication line

Details System of detecting troubles of an optical communication line System of detecting troubles of an optical communication line

1995-05-15

1996-07-23

Boudreau, Leo

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359109, 385 30, 385 31, 385 39, H04B 1008, G02B 626, G02B 642

Patent

active

055395589

ABSTRACT:
A system of detecting an occurrence of a trouble in an optical communication line having a plurality of nodes with a sending port and a receiving port, a plurality of 2-input & 2-output couplers and fibers connecting the nodes and the couplers for distributing any signal issued from a node to all the nodes. The coupler has an intersecting allocation between two inputs and two outputs. The intersection in the coupler makes the recurring signal pass only through a series of evanescent linkages of the couplers to the receiving port of the same node. When a trouble arises, the evanescent linkage is more likely to be broken down than the direct linkage and the node notices the trouble by the extinction of the recurring signal.

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Payne et al, "Transparent Single-Mode Fiber Optical Networks", Journal of Lightwave Technology, vol. LT-4, No. 7, Jul. 1986, pp. 864-869.

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