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

作者：Kim Kwang Taek; Kim In Soo; Lee Cherl Hee^*; Lee Jonghun

来源：Sensors, 2012, 12(6): 7886-7892.

DOI：10.3390/s120607886

• temperature insensitive
• cladding etched
• Fiber Bragg grating
• compensation
• negative thermo-optic coefficient

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 x 10(-4) degrees C-1.

• 出版日期2012-6