Optical time domain reflectometer using a tunable optical source

Details Optical time domain reflectometer using a tunable optical source Optical time domain reflectometer using a tunable optical source

1991-06-07

1993-01-12

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

G01N 2188, G01N 2159

Patent

active

051794209

ABSTRACT:
In an optical time domain reflectometer (OTDR), an optical signal is coupled to an optical fiber path to be tested, and back-scattered and reflected light from the optical fiber path is detected and used to determine loss-distance characteristics of the path. A control unit varies the wavelength of the optical signal by varying the temperature of a semiconductor laser constituting the optical source, so that the loss-distance characteristics for a plurality of different wavelengths are determined and can be displayed to show any wavelength dependent loss of the optical fiber path, which loss may be due to modal interference associated with closely spaced discontinuities in the path.

REFERENCES:
patent: 3588253 (1971-06-01), Wittmann
patent: 4737026 (1988-04-01), Dalgoutte et al.
patent: 4911515 (1990-03-01), So et al.
patent: 4984884 (1991-01-01), Ryu et al.
Nakazawa et al "Optical Time Domain Reflectometry at a Wavelength of 1.5 .mu.m Using Stimulated Roman Scattering in Multimode, Graded-Index Optical Fiber" J. Appl.-Phys.53 (3) Mar. 1982 pp. 1391-1393.
Kawasaki et al. "Optical Time Domain Reflectometer For Single-Mode Fiber a Selectable Wavelengths", Appl. Phys. Lett. 38(10) May 15, 1981, pp. 740-742.
Anffret et al "Field Measurement Set For Attenuation & Bandwidth of Optical Links" Electronics Letters (Oct. 9, 1981, vol. 16 #21 pp. 798-799.
"Automation of an Optical Time Domain Reflectometer to Measure Loss and Return Loss", Vincent C. Y. So et al., Journal of Lightwave Technology, vol. 8, No. 7, pp. 1078-1083, Jul. 1990.
"In-line testing for fiber subscriber loop applications", J. W. Jiang et al., Society of Photo-Optical Instrumentation Engineers vol. 1363 Fiber Optics in the Subscriber Loop (1990), pp. 191-195, Sep. 1990.

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