Method and apparatus for identifying echoes detected by an optic

Details Method and apparatus for identifying echoes detected by an optic Method and apparatus for identifying echoes detected by an optic

1993-05-21

1994-12-13

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2188

Patent

active

053733568

ABSTRACT:
A controller (124) analyzes a set of OTDR return data stored in a memory (134) and determines if a particular event is an echo by comparing its measured location and/or amplitude (loss) with calculated locations (208) and amplitudes for various-order echoes. Possible echoes are optionally assigned an echo probability level (220, 224, 228) based on the degree to which their measured locations and/or amplitudes match the calculated echo locations and amplitudes. Possible echoes are appropriately marked (210) so that an OTDR display (136) indicates to a user which events are possible echoes. Optionally, events may be marked as having a low, medium, or high probability of being echoes.

REFERENCES:
patent: 4996654 (1991-02-01), Rosenow
patent: 5115439 (1992-10-01), Holmbo et al.
"A New Technique in O.T.D.R.", Steven Newton, Electronics & Wireless World, May 1988, United Kingdom, pp. 496-500.
"Optical Fiber Splice Loss Predictions from One-Way OTDR Measurements Based on a Probability Model", L. Bjerkan, Journal of Lightwave Technology, vol. 7, No. 3, Mar. 1989, USA, pp. 490-499.
"Fiber-Optic Reflection Measurements Using OCWR and OTDR Techniques", F. P. Kapron et al., Journal of Lightwave Technlogy, vol. 7, No. 8, Aug. 1989, USA, pp. 1234-1241.
"Numerical Processing Provides a Boost for OTDR Resolution", John H. Haywood, Photonics Spectra, Laurin Publishing, Dec. 1989, pp. 88-92.

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