The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 23, 1996
Filed:
May. 15, 1995
Ryugen Yonemura, Osaka, JP;
Takanori Sawai, Osaka, JP;
Nobuyuki Kobayashi, Yokkaichi, JP;
Hayato Yuuki, Yokkaichi, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Sumitomo Wiring Systems, Ltd., Yokkaichi, JP;
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.