Journal
OPTICS COMMUNICATIONS
Volume 284, Issue 6, Pages 1557-1560Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2010.11.045
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The inherent temperature dependence of optical fibre Bragg gratings is caused mainly by the positive thermo-optic effect of the fibre core material, and it results in an increase of Bragg wavelength with temperature. Special mounting techniques may be designed in order to compensate this thermo-optic effect by counter-acting effects: decreasing mechanical strain, as well as a decreasing effective refractive index for the guided light wave by evanescent field interaction with a liquid of negative thermo-optic effect. Because of the non-linear interaction characteristics, exact temperature compensation is obtained for a certain temperature, which depends on the design parameters. Such stabilised fibre Bragg gratings find application as wavelength references in Bragg grating sensor networks. (C) 2010 Elsevier B.V. All rights reserved.
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