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Sensors 2012, 12(6), 7886-7892; doi:10.3390/s120607886
Article

A Temperature-Insensitive Cladding-Etched Fiber Bragg Grating Using a Liquid Mixture with a Negative Thermo-Optic Coefficient

1, 1, 2,*  and 2
Received: 28 April 2012 / Revised: 30 May 2012 / Accepted: 31 May 2012 / Published: 8 June 2012
(This article belongs to the Section Physical Sensors)
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Abstract

To compensate for the temperature dependency of a standard FBG, a cladding-etched FBG immersed with a liquid mixture having a negative thermo-optic coefficient is presented, and its characteristics are investigated. The Bragg wavelength of the cladding-etched FBG is shifted counter to the direction of the Bragg wavelength shift of a conventional FBG according to the mixing ratio of glycerin to water; thus, the temperature-dependent Bragg wavelength shift was almost compensated by using a liquid mixture of water (50%) and glycerin (50%) having the negative thermo-optic coefficient of −5 × 10−4 °C−1.
Keywords: temperature insensitive; cladding etched; Fiber Bragg grating; compensation; negative thermo-optic coefficient temperature insensitive; cladding etched; Fiber Bragg grating; compensation; negative thermo-optic coefficient
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Kim, K.T.; Kim, I.S.; Lee, C.-H.; Lee, J. A Temperature-Insensitive Cladding-Etched Fiber Bragg Grating Using a Liquid Mixture with a Negative Thermo-Optic Coefficient. Sensors 2012, 12, 7886-7892.

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