Adaptive pulse width optical fault finder

Details Adaptive pulse width optical fault finder Adaptive pulse width optical fault finder

1990-04-12

1991-12-03

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2188

Patent

active

050695444

ABSTRACT:
An optical fault finder which optimizes the pulse width of the test signal which is transmitted through an optical fiber. The fault finder is an optical time domain reflectometer (OTDR) having a variable pulse width light source and associated timer. When a first test signal is launched down the optical fiber, a microprocessor within the OTDR detects any discrete losses and records the signal level at these faults. The OTDR then launches subsequent test signals whose pulse widths have been optimized according to the signal level at each fault. Also, a novel processing technique utilizes a matched filter to provide greater sensitivity to loss detection and location of the corresponding faults.

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Three brochures depicting commercially available OTDR's --Model 54OOXO 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, v. 24, pp. 2313-2321, Aug. 1, 1985.

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