polyimide; temperature sensing; tilted fiber Bragg grating; Cladding modes; Coated optical fibers; Femtoseconds; Harsh environment; High temperature stability; Mechanical robustness; Polyimide coating; Stability robustness; Temperature sensing; Tilted fiber Bragg grating; Electronic, Optical and Magnetic Materials; Computer Networks and Communications; Electrical and Electronic Engineering
Abstract :
[en] Polyimide (PI) exhibits exceptional high-temperature stability and mechanical robustness, making PI-coated optical fibers well-suited for operation in harsh environments. This work presents a 12° tilted fiber Bragg grating (TFBG) temperature sensor, fabricated using femtosecond laser direct writing through the PI coating of a single-mode fiber. This innovative technique preserves the integrity of the coating while significantly improving the sensor's mechanical strength and environmental resilience. The study reveals that the PI coating acts as a Fabry-Pérot (F-P) cavity, inducing periodic amplitude modulation in the cladding mode resonances of the TFBG. High-temperature testing (90°C to 270°C) demonstrates distinct thermal responses, with temperature sensitivities of approximately 13.5pm/°C, 13.2pm/°C, and 5.7pm/°C for the core mode, ghost mode, and cladding modes, respectively. Notably, the cladding mode envelope exhibits an enhanced negative sensitivity of up to approximately -21.7pm/°C.
Disciplines :
Materials science & engineering
Author, co-author :
Chen, Ruibin; College of Science Shantou University, Research Center for Advanced Optics and Photoelectronics, Department of Physics, Shantou, China
Ma, Shaoxin; College of Science Shantou University, Research Center for Advanced Optics and Photoelectronics, Department of Physics, Shantou, China
Zhong, Xintong; College of Science Shantou University, Research Center for Advanced Optics and Photoelectronics, Department of Physics, Shantou, China
Qu, Hang; College of Science Shantou University, Research Center for Advanced Optics and Photoelectronics, Department of Physics, Shantou, China
Marques, Carlos; University of Aveiro, CICECO - Aveiro Institute of Materials, Physics Department, Aveiro, Portugal ; VSB - Technical University of Ostrava, Department of Physics, Ostrava, Czech Republic
Caucheteur, Christophe ; Université de Mons - UMONS > Faculté Polytechnique > Service d'Electromagnétisme et Télécommunications
Hu, Xuehao ; Université de Mons - UMONS > Faculté Polytechnique > Service d'Electromagnétisme et Télécommunications
Language :
English
Title :
Tilted fiber Bragg grating in polyimide-coated optical fiber for temperature measurement
Publication date :
25 August 2025
Event name :
2025 25th Anniversary International Conference on Transparent Optical Networks (ICTON)
Event place :
Barcelona, Esp
Event date :
06-07-2025 => 10-07-2025
By request :
Yes
Main work title :
Conference Proceedings - 2025 25th Anniversary International Conference on Transparent Optical Networks, ICTON 2025
Research Institute for Materials Science and Engineering
Funding text :
The Fonds de la Recherche Scientifique (F.R.S.-FNRS) under the Postdoctoral Researcher grant (Charg\u00E9 de Recherches) of Xuehao Hu and the Research Director Position of Christophe Caucheteur. This work was developed within the scope of the projects CICECO (LA/P/0006/2020, UIDB/50011/2020 & UIDP/50011/2020) and DigiAqua (PTDC/EEI-EEE/0415/2021), financed by national funds through the (Portuguese Science and Technology Foundation/MCTES (FCT I.P.)). The research was co-funded by the financial support of the European Union under the REFRESH - Research Excellence For REgion Sustainability and High-tech Industries project number CZ.10.03.01/00/22_003/0000048 via the Operational Programme Just Transition.
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