Journal
KSME INTERNATIONAL JOURNAL
Volume 15, Issue 3, Pages 309-319Publisher
KOREAN SOC MECHANICAL ENGINEERS
DOI: 10.1007/BF03185214
Keywords
etched Bragg grating; planar light waveguide; butt coupling technique; nonlinear thermooptic effect; temperature sensor; classical lamination theory
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This paper demonstrates the development of optical temperature sensor based on the etched silica-based planar waveguide Bragg grating. Topics include design and fabrication of the etched planar waveguide Bragg grating optical temperature sensor. The typical bandwidth and reflectivity of the surface etched grating has been similar to0.2 nm and similar to9%, respectively, at a wavelength of similar to 1552 nm. The temperature-induced wavelength change is found to be slightly non-linear over similar to 200 degreesC temperature range. Typically, the temperature-induced fractional Bragg wavelength shift measured in this experiment is 0.0132 nm/degreesC with linear curve fit. Theoretical models with nonlinear temperature effect for the grating response based on waveguide and plate deformation theories agree with experiments to within acceptable tolerance.
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