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

Sensors

Kwang Taek Kim¹  In Soo Kim¹  Cherl-Hee Lee² 

[1]Department of Optoelectronics, Honam University, Gwangju 506-714, Korea

[2]Robot System Division, Daegu Gyeongbuk Institute of Science & Technology, Daegu 711-813, Korea

关键词: temperature insensitive;    cladding etched;    Fiber Bragg grating;    compensation;    negative thermo-optic coefficient;   

DOI  :  10.3390/s120607886

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2012 by the authors; licensee MDPI, Basel, Switzerland