Optical fault finder using matched and clipping filters

Details Optical fault finder using matched and clipping filters Optical fault finder using matched and clipping filters

1990-04-12

1991-11-19

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

25022715, G01N 2188

Patent

active

050661183

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.

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Three Brochures Depicting Commercially Available OTDR's--Model 5400XQ from 3M Photodyne (Copyright Notice Dated 1989--Model MW9010A from Anritsu (Printing Date 1989)--Model TFS2020 from Tektronix (Printing Date 10/89).
Article Entitled "Optical Time-Domain Reflectometer Specifications and Performance Testing" by B. Danielson (From Applied Optics, vol. 24, pp. 2313-2321, Aug. 1, 1985).

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