Abstract

A functional distributed fiber-optic stress-location measurement technique by arbitrary shaping of the optical coherence function has been demonstrated. The technique measures the distribution or location of stress-induced polarization mode coupling in a polarization-maintaining fiber by manipulating the optical coherence function. The location of applied stress is given by optical path difference between the two polarization modes, which is determined by the synthesis of the coherence function. Three types of coherence function-a scanning peak, a scanning low-sidelobe peak, and a standing triangle-have been synthesized experimentally and used for stress locating. When using the coherence function of scanning peak, the coherence peak is slid to scan over the measurement range by a phase modulation to obtain the stress distribution; when using the triangular coherence function, the detection range is set within a linear slope of the triangle so that the stress location is directly converted into the value of the coherence degree.

[IEEE ]

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Appl. Opt. (2)

J. Lightwave Technol. (7)

K. Hotate and O. Kamatani, "Optical coherence domain reflectometry by synthesis of coherence function", J. Lightwave Technol., vol. 11, pp. 1701-1710, Nov. 1993.

K. Hotate and T. Okugawa, "Optical information processing by synthesis of the coherence function", J. Lightwave Technol., vol. 12, pp. 1247-1255, July 1994.

J. Zhang, V. A. Handerek, I. Cokgor, V. Pantelic and A. J. Rogers, "Distributed sensing of polarization mode coupling in high birefringence optical fiber using intense arbitrarily polarized coherent light", J. Lightwave Technol., vol. 15, pp. 794-802, May 1997.

M. Imai, Y. Terasawa and Y. Ohtsuka, "Polarization fluctuation characteristics of a highly birefringent fiber system under forced vibration", J. Lightwave Technol., vol. 6, pp. 720-727, May 1988.

M. Tsubokawa, T. Higashi and Y. Sasaki, "Measurement of mode coupling and extinction ratios in polarization-maintaining fibers", J. Lightwave Technol., vol. 7, pp. 45-50, Jan. 1989.

M. A. Farahani and T. Gogolla, "Spontaneous Raman scattering in optical fibers with modulated probe light for distributed temperature Raman remote sensing", J. Lightwave Technol., vol. 17, pp. 1379-1391, Aug. 1999 .

M. Tateda, T. Horiguchi, T. Kurashima and K. Ishihara, "Measurement of strain distribution along field-installed optical fibers using Brillouin spectroscopy", J. Lightwave Technol., vol. 8, pp. 1269-1272, Aug. 1990.

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