Optical fiber distortion measurement device and method thereof

Details Optical fiber distortion measurement device and method thereof Optical fiber distortion measurement device and method thereof

1998-06-22

1999-09-07

Kim, Robert H.

Optics: measuring and testing

For optical fiber or waveguide inspection

356350, G01N 2188

Patent

active

059495332

ABSTRACT:
An optical fiber distortion measurement system (i.e., device and method) measures an optical fiber, which is constructed by alternately connecting two kinds of optical fibers whose Brillouin frequency shifts are different from each other. The system sequentially supplies optical pulses to the measured optical fiber while changing their light frequencies, so that Brillouin backscattering beams are output from the measured optical fiber. At first, the system supplies an optical pulse having a prescribed light frequency to the measured optical fiber of a non-distortion state, so that the device produces initial data representing time-related variations of light intensity of Brillouin backscattering light output from the measured optical fiber. Then, the system measures a time-related variation waveform representing light intensity of Brillouin backscattering light, which is output from the measured optical fiber supplied with the optical pulse of the prescribed light frequency. By comparing the measured time-related variation waveform with the initial data, the system determines occurrence of distortion in the measured optical fiber. Thereafter, the system discriminates a kind of the distortion, which corresponds to expansion or contraction, on the basis of a relationship between Brillouin frequency shifts, which are respectively calculated with respect to a detection point and its adjacent point on the measured time-related variation waveform. The Brillouin frequency shift is calculated in accordance with a quadratic approximation formula, which is created on the basis of the initial data.

REFERENCES:
patent: 5627927 (1997-05-01), Udd
patent: 5767956 (1998-06-01), Yoshida
Garus et al., "Brillouin Optical-Fiber Frequency-Domain Analysis for Distributed Temperature and Strain Measurements", J. of Lightwave Tech., vol. 15, No. 4, pp. 654-662 (Apr. 1997).
Kurashima et al., "Brillouin Optical-Fiber Time Domain Reflectometry", IEICE Transactions on Communications, vol. E76-B, No. 4, pp. 382-389 (Apr. 1993).

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