Quadratic behavior of fiber Bragg grating temperature coefficients

Flockhart, G M H and Maier, R R J and Barton, J S and MacPherson, W N and Jones, J D C and Chisholm, K E and Zhang, L and Bennion, I and Read, I and Foote, P D (2004) Quadratic behavior of fiber Bragg grating temperature coefficients. Applied Optics, 43 (13). pp. 2744-2751. ISSN 0003-6935 (https://doi.org/10.1364/AO.43.002744)

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We describe the characterization of the temperature and strain responses of fiber Bragg grating sensors by use of an interferometric interrogation technique to provide an absolute measurement of the grating wavelength. The fiber Bragg grating temperature response was found to be nonlinear over the temperature range -70 degreesC to 80 degreesC. The nonlinearity was observed to be a quadratic function of temperature, arising from the linear dependence on temperature of the thermo-optic coefficient of silica glass over this range, and is in good agreement with a theoretical model. (C) 2004 Optical Society of America.