Fault location system in an optical fiber transmission system

Details Fault location system in an optical fiber transmission system Fault location system in an optical fiber transmission system

1980-03-18

1982-03-23

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

356 5, 356237, G01N 2188

Patent

active

043209688

ABSTRACT:
A fault location system for locating the fault point of an optical fiber transmission system has been found. The present system comprises a laser for generating an optical beam, a sweep oscillator for modulating said laser beam, a half mirror mounted between the outlet of the laser and the inlet of the optical fiber to be tested, an optical receiver for converting the optical beam reflected by the fault point to an electrical signal through said half mirror, a modulator for providing the frequency difference between the instantaneous output frequency of said sweep oscillator and the output frequency of said optical receiver, a low pass filter connected to the output of said modulator, and a spectrum analyzer connected to the output of the low pass filter. The present system has the advantage that the S/N of the system is excellent, and plural fault points can be located at the same time.

REFERENCES:
patent: 3412323 (1968-11-01), Unterberger et al.
patent: 3751606 (1973-08-01), Kaiser, Jr.
Report #946 "An Analysis Relating to the Fault Location in an Optical Fiber System" 1976, Inst. of Elect. & Comm. in Japan.
Report #S3-13 "Accuracy of the Fault Location . . . by the Frequency Difference Method" 1976, Inst. of Elect. & Comm. in Japan.
"Frequency-Modulated Fault Location for Power Lines" Stevens et al., IEEE Trans. Power App. & Syst. vol. PAS91, No. 5, Sep.-Oct. 1972, pp. 1760-1768.

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