Optically heated fiber Bragg grating in active fibers for low temperature sensing application

Lin Qi; Long Jin; Bai-Ou Guan

doi:10.1117/12.2031251

15 October 2013 Optically heated fiber Bragg grating in active fibers for low temperature sensing application

Lin Qi, Long Jin, Bai-Ou Guan

Proceedings Volume 8924, Fourth Asia Pacific Optical Sensors Conference; 892404 (2013) https://doi.org/10.1117/12.2031251
Event: Asia Pacific Optical Sensors Conference 2013, 2013, Wuhan, China

Abstract

Optically heated fiber Bragg gratings due to the absorption over the fiber core in rare-earth doped fibers are experimentally demonstrated. Bragg wavelength variations with pump power are measured for different fibers. We found that the Er/Yb-codoped fiber presents the strongest thermal effect, due to the high absorption. A maximum wavelength shift of 1.34 nm can be obtained when the 980 nm pump power is 358 mW under room temperature, suggesting the fiber is heated up to over 100 °C. Furthermore, the thermal effect is enhanced by pumping the surrounding air to close to vacuum. A wavelength shift of 1.69 nm is attained, due to the weakened ability of heat transfer at the silica-air interface. The optical heating presents a very short response time and can found applications in low temperature circumstances.

Citation Download Citation

Lin Qi, Long Jin, and Bai-Ou Guan "Optically heated fiber Bragg grating in active fibers for low temperature sensing application", Proc. SPIE 8924, Fourth Asia Pacific Optical Sensors Conference, 892404 (15 October 2013); https://doi.org/10.1117/12.2031251

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