Cladding modes; Core modes; Direct-writing; Fiber Bragg Grating Sensors; Focused femtosecond lasers; Specialty optical fibers; Temperature and strain measurements; Temperature sensitivity; Tilted Bragg gratings; Tilted fiber Bragg grating; Atomic and Molecular Physics, and Optics
Abstract :
[en] In this Letter, we propose an in-line tilted fiber Bragg grating sensor for temperature and strain measurements. The grating is inscribed in a specialty optical fiber using tightly focused femtosecond laser pulses and the line-by-line direct writing method. Beside the central core in which the grating is produced, a hollow channel filled with glycerol aqueous solution significantly improves the sensitivity of the fiber cladding modes due to its high thermo-optic coefficient. We show that the temperature sensitivity of the core mode is 9.8 pm/°C, while the one of the cladding modes is strongly altered and can reach -24.3 pm/°C, in the investigated range of 20-40°C. For the strain measurement, sensitivities of the core mode and the cladding modes are similar (∼0.60 pm/με) between 0 and 2400 με. The significative difference of temperature sensitivity between the two modes facilitates the discrimination of the dual parameters in simultaneous measurements.
Disciplines :
Materials science & engineering
Author, co-author :
Hu, Xuehao ; Université de Mons - UMONS > Recherche > Service ERC Unit - Advanced Photonic
Liu, Yang; Research Center for Advanced Optics and Photoelectronics, Department of Physics, College of Science, Shantou University, Shantou, China
Wei, Heming; Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Joint International Research Laboratory of Specialty Fiber Optics and Advanced Communication, Shanghai University, Shanghai, China
Teng, Chuanxin; Guangxi Key Laboratory of Optoelectronic Information Processing, Guilin University of Electronic Technology, Guilin, China
Yu, Qianqing; Yangtze Optical Electronics Co., Ltd., East Lake Hi-Tech Development Zone, Wuhan, China
Luo, Zhijun; Yangtze Optical Electronics Co., Ltd., East Lake Hi-Tech Development Zone, Wuhan, China
Lian, Zhenggang ; Yangtze Optical Electronics Co., Ltd., East Lake Hi-Tech Development Zone, Wuhan, China
Qu, Hang; Research Center for Advanced Optics and Photoelectronics, Department of Physics, College of Science, Shantou University, Shantou, China
Caucheteur, Christophe ; Université de Mons - UMONS > Faculté Polytechnique > Service d'Electromagnétisme et Télécommunications
Language :
English
Title :
Tilted Bragg grating in a glycerol-infiltrated specialty optical fiber for temperature and strain measurements.
Publication date :
01 June 2024
Journal title :
Optics Letters
ISSN :
0146-9592
eISSN :
1539-4794
Publisher :
Optica Publishing Group (formerly OSA), United States
Research Institute for Materials Science and Engineering
Funders :
Science and Technology Department of Guangdong Province Natural Science Foundation of Guangxi Zhuang Autonomous Region The Fonds de la Recherche Scientifique
Funding text :
Science and Technology Department of Guangdong Province (2022A1515012571); Natural Science Foundation of Guangxi Zhuang Autonomous Region (2023GXNSFDA026040); The Fonds de la Recherche Scientifique (F.R.S.-FNRS). Funding from Fonds De La Recherche Scientifique (F. R. S. - FNRS) supports the Postdoctoral Researcher grant (Charg\u00E9 de Recherches) of Xuehao Hu and the Senior Research Associate Position of Christophe Caucheteur.Funding. Science and Technology Department of Guangdong Province (2022A1515012571); Natural Science Foundation of Guangxi Zhuang Autonomous Region (2023GXNSFDA026040); The Fonds de la Recherche Scientifique (F.R.S.-FNRS).
