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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
1 Department of Optoelectronics, Honam University, Gwangju 506-714, Korea 2 Robot System Division, Daegu Gyeongbuk Institute of Science & Technology, Daegu 711-813, Korea
* Author to whom correspondence should be addressed.
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 (CC BY 3.0).

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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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