Method and apparatus for carrying out optical time domain reflec

Details Method and apparatus for carrying out optical time domain reflec Method and apparatus for carrying out optical time domain reflec

1991-07-12

1994-10-04

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

25022721, G01N 2100, G01N 2188

Patent

active

053531108

ABSTRACT:
An optical time domain reflectometry method and apparatus that employs Hadamard transforms to increase the signal-to-noise ratio. A sequence of N pulses of light corresponding to a Hadamard derived code are launched down a fiber optic cable for each of N such codes. Selected combinations of pulses of reflected light are transformed by a Hadamard derived matrix to a set of equations that are solved simultaneously to determine the power reflected from each of N points. Where a Hadamard code is used the average mean square error is reduced by a factor of 1/N. Where a simplex code is employed the average mean square error is reduced by a factor of 4N/(1+N).sup.2. In addition, N measurements of the power reflected at each point are computed and averaged.

REFERENCES:
patent: 4743753 (1988-05-01), Cheng et al.
patent: 4812038 (1989-03-01), Nazarathy et al.
patent: 4968880 (1990-11-01), Beller
patent: 5000568 (1991-03-01), Trutna, Jr. et al.

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