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:
Jun. 11, 1991
Filed:
Sep. 25, 1989
Applicant:
Inventor:
George Bu-Abbud, Plano, TX (US);
Assignee:
Reliance Comm/Tec Corporation, Chicago, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
356 731 ; 372 33 ;
Abstract
An echo cancelling circuit for use with a laser whose generated light is connected to an optical fiber by a connector. The connector reflects part of the laser light to a detector associated with the laser. The echo cancelling circuit attenuates the laser generated light by a predetermined factor. The cancelling circuit then detects the attenuated laser light and develops a signal whose amplitude and phase is such as to substantially cancel the signal representative of the light reflected from the connector.