Optical time domain reflectometer using optical element with thr

Details Optical time domain reflectometer using optical element with thr Optical time domain reflectometer using optical element with thr

1990-06-26

1991-07-02

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

356 731, H01J 516, G01N 2100

Patent

active

050287753

ABSTRACT:
An optical element has three operation modes of light oscillation, light amplification, and light attenuation, which are switched in accordance with the intensity of an excitation component. The optical element having a first light terminal from which a light pulse is output to an optical fiber to be tested, and a second light terminal through which reflected light from the optical fiber is passed in the amplification mode or in the attenuation mode. Light-receiving section receives the reflected light output from the second light terminal of the optical element, and converts the reflected light into an electric signal. Signal processing section subjects the electric signal output from the light-receiving section to a predetermined signal processing step for testing the optical fiber. Excitation component control section outputs to the optical element a first excitation component for enabling the optical element to operate in the oscillation mode at a first timing, a second excitation component for enabling the optical element to operate in the attenuation mode at a second timing subsequent to the first timing, and a third excitation component for enabling the optical element to operate in the amplification mode at a third timing subsequent to the second timing.

REFERENCES:
patent: 4070118 (1978-01-01), Maslowski et al.
patent: 4548494 (1985-10-01), Geckeler et al.
P. Healey, "OTDR in Monomode Fibres at 1.3 .mu.m Using a Semiconductor Laser", Electronics Letters, vol. 17, No. 2, 1/81, pp. 62-64.
The Transactions of the IEICE, Saitoh et al., "Structural Design of Polarization Insensitive 1.55 .mu.m Traveling Wave Semiconductor Laser Amplifier", vol. E71, No. 5, May 1988, pp. 482-484.
Suzuki et al., "Optical Time-Domain Reflectometer with a Semiconductor Laser Amplifier", Electronics Letters, 30th Aug. 1984, vol. 20, No. 18, pp. 714-716.
Saitoh et al., "1.5 .mu.m GaInAsP Traveling-Wave Semiconductor Laser Amplifier", IEEE Journal of Quantum Electronics, vol. QE-23, No. 6, Jun. 1987, pp. 1010-1020.

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