Temperature and strain characterization of Bragg gratings impressed with femtosecond laser radiation in suspended-silica-core fibers

Luís A. Fernandes; Martin Becker; Orlando Frazão; Manfred Rothhardt; Sven Brückner; Kay Schuster; Jens Kobelke; José L. Santos; Paulo V. S. Marques

doi:10.1117/12.839641

4 August 2009 Temperature and strain characterization of Bragg gratings impressed with femtosecond laser radiation in suspended-silica-core fibers

Luís A. Fernandes, Martin Becker, Orlando Frazão, Manfred Rothhardt, Sven Brückner, Kay Schuster, Jens Kobelke, José L. Santos, Paulo V. S. Marques

Author Affiliations +

Proceedings Volume 7386, Photonics North 2009; 73861N (2009) https://doi.org/10.1117/12.839641
Event: Photonics North 2009, 2009, Quebec, Canada

Abstract

Fiber Bragg Gratings (FBG's) are widely used in various fields, including optical fiber sensors. In this work, the temperature and strain response of C-band FBG's in pure silica four-leaf clover shaped suspended-core fibers was analyzed. These FBGs were fabricated by femtosecond laser exposure, which enabled the refractive index modulation of the pure-silica-core of the fibers. We compared the Bragg wavelength variation with strain and temperature for two different suspended-core fibers (256b2 and 256b5). The 256b2 fiber has a core diameter of 4,9 μm and a hollow hole inside the core with 1,4 μm; the 256b5 fiber has a solid silica core with a 7,2 μm diameter. For strain and temperature characterization, the sensing head was attached to a translation stage with a resolution of 1 μ;m and was placed in a tubular oven, which permits a temperature reading to be set with an error smaller than 0,1 °C. Both have shown the same sensitivity to strain (1,2 pm/με) but different sensitivity to temperature variation (8,4 pm/°C and 10 pm/°C respectively). The relative difference between the thermal coefficients of the two selected Bragg signatures is 16%. The results obtained indicate that these gratings can be used in optical fiber sensing, for example in the context of the important problem of simultaneous strain and temperature measurement.

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Luís A. Fernandes, Martin Becker, Orlando Frazão, Manfred Rothhardt, Sven Brückner, Kay Schuster, Jens Kobelke, José L. Santos, and Paulo V. S. Marques "Temperature and strain characterization of Bragg gratings impressed with femtosecond laser radiation in suspended-silica-core fibers", Proc. SPIE 7386, Photonics North 2009, 73861N (4 August 2009); https://doi.org/10.1117/12.839641

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