Variable wavelength optical time domain reflectometry apparatus

Details Variable wavelength optical time domain reflectometry apparatus Variable wavelength optical time domain reflectometry apparatus

1992-03-02

1994-06-21

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

25022718, G01N 2188

Patent

active

053232240

ABSTRACT:
A light pulse having a high intensity generated from LD pumped solid state laser is launched into optical fiber from its one end to generate induced Raman scattering. The induce Raman scattering light emitted from the other end of optical fiber has a wide spectrum of wavelengths with strong intensity. Thus obtained induced Raman scattering light is introduced into optical fiber under test from its one end. Subsequently, the backward scattering light returning to the aforementioned one end is taken out by means of optical coupler or optical switch to brought into optical detectors, which, in turn, detects the light so as to be measured on the intensity of the particular wave components by every period of time by means of digital averaging circuit and computer.

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Kawasaki et al "Optical time domain reflectometer for single-mode fiber at selectable wavelengths", Appl. Phys. Lett. 38(10) May 15, 1981, pp. 740-742.
IEEE Journal of Quantum Electronics, vol. QE-18, No. 10, pp. 1509-1515, Oct., 1982, B. Costa, et al., "Phase Shift Technique For The Measurement Of Chromatic Dispersion In Optical Fibers Using Led's".
Frequenz, vol. 35, No. 9, pp. 243-246, 1981, H.F. Schlaak, et al., "Optical Fiber Length Measurement By Pulsereflectometry".

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