Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1988-04-12
1989-06-13
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
G01N 2184, G01N 2188
Patent
active
048386901
ABSTRACT:
A simultaneous bi-directional OTDR optical fiber measurement method wherein a test fiber is spliced between a launch fiber and a termination fiber which is provided with a reflective coating at its terminal end. A laser light pulse is introduced into the launch fiber and the forward trace signal and reverse trace signal from the light pulse are detected. A correction is applied to the reverse trace signal to account for reflectivity originating at the fiber input end so that an accurate measurement can be made of certain fiber characteristics of a single-mode optical fiber.
REFERENCES:
Publication by Fermann et al., entitled "Comparative Measurement of Rayleigh Scattering in Single-Mode Optical Fibers Based on an OTDR Technique", Apr. 1988, Journal of Lightwave Technology, vol. 6, No. 4, pp. 545-551.
Publication by Fermann et al., entitled "A New Technique for the Relative Measurement of Scatter Levels in Single Mode Fibres".
Publication by Gold et al., entitled "Long-Range Single-Mode OTDR: Ultimate Performance and Potential Uses".
Publication by Philen et al., "Single-Mode Fiber OTDR: Experiment and Theory", IEEE Transactions on Microwave Theory and Techniques, vol. MTT-30, No. 10, Oct. 1982.
Publication by Hartog et al., entitled "On the Theory of Backscattering in Single-Mode Optical Fibers", Journal of Lightwave Technology, vol. LT-2, No. 2, Apr. 1984, pp. 76-82.
Buckland Eric L.
Nishimura Masayuki
Jenkins Richard E.
McGraw Vincent P.
Sumitomo Electric Fiber Optics Corporation
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