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:
Nov. 19, 1991
Filed:
Apr. 12, 1990
Richard Buerli, Thousand Oaks, CA (US);
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Abstract
An optical fault finder employing a novel processing technique to achieve greater sensitivity to loss detection and location of faults. The technique includes the use of a matched filter which sequentially operates on a set of datapoints in the trace signal. The resulting matched filter function generates peaks at those locations corresponding to discrete losses in the trace signal. In order to optimize response of the matched filter with respect to reflective faults, a clipping filter is applied to the trace signal, prior to the matched filter, to remove reflective signals. Means are also provided for determining the value of the loss, and for optimizing the pulse width of the test signal launched into the fiber under test.