Departure from linearity of fibre Bragg grating temperature coefficients

Flockhart, GMH and MacPherson, WN and Barton, JS and Jones, JDC and Zhang, L and Bennion, I; (2002) Departure from linearity of fibre Bragg grating temperature coefficients. In: OFS 2002. IEEE, USA, pp. 75-78. ISBN 0780372891

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Abstract

We have measured the Bragg wavelength shift of three gratings from -30degreesC to +80degreesC. The observed deviation from linearity is a quadratic function of temperature, arising from the non-linear thermo-optic coefficient of silica glass.