Chinese Optics Letters, 2019, 17 (12): 120603, Published Online: Dec. 3, 2019  

Investigation on temperature characteristics of weak fiber Bragg gratings in a wide range Download: 683次

Xiaojun Fan 1,2,3Junfeng Jiang 1,2,3,*Xuezhi Zhang 1,2,3,**Kun Liu 1,2,3Shuang Wang 1,2,3Tiegen Liu 1,2,3
Author Affiliations
1 School of Precision Instrument and Opto-electronics Engineering, Tianjin University, Tianjin 300072, China
2 Tianjin Optical Fiber Sensing Engineering Center, Institute of Optical Fiber Sensing of Tianjin University, Tianjin 300072, China
3 Key Laboratory of Opto-electronics Information Technology, Ministry of Education, Tianjin University, Tianjin 300072, China
Abstract
A weak fiber Bragg grating (WFBG) is an ideal quasi-distributed optical fiber sensor. Special attention should be paid to the spectrum and sensing performance of the WFBG at extreme temperatures due to its poor reflection intensity. In this Letter, the temperature characteristics of the WFBG from 252.75°C to 200.94°C are experimentally investigated. Five WFBGs with reflectivity from ~0.25% to ~10% are used in the experiments. The reflectivity variations and wavelength shifts at different temperatures are studied. Experimental results show that the WFBG can survive and work at extreme temperatures, but the performance is affected significantly. The reflectivity is affected significantly by both cryogenic temperature and high temperature. The temperature responses of Bragg wavelengths in the wide temperature range are also obtained.

Xiaojun Fan, Junfeng Jiang, Xuezhi Zhang, Kun Liu, Shuang Wang, Tiegen Liu. Investigation on temperature characteristics of weak fiber Bragg gratings in a wide range[J]. Chinese Optics Letters, 2019, 17(12): 120603.

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