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:
Oct. 31, 2000
Filed:
Nov. 26, 1997
Applicant:
Inventors:
Peter Thoma, Rottenberg, DE;
Peter Hoffmann, Boeblingen, DE;
Assignee:
Hewlett-Packard Company, Fort Collins, CO (US);
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
356 731 ;
Abstract
In an optical time domain reflectometer for the measurement in optical networks with currently applied traffic signals a switchable filter device Is positioned before a detector unit for the measurement of the reflected optical signals caused by an optical measurement section. The filter device includes an optical path into which one or more optical filters can be inserted reversibly, e.g. by an actuator. Communication signals present on the measurement section are attenuated by the filter(s) and the detector unit is able to detect the reflected signals undisturbed by the communication signals.