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Title: Thermal Treatments and Compensation Techniques for the Improved Response of FBG Sensors in POFs
Authors: Leal-Junior, Arnaldo Gomes 
Theodosiou, Antreas 
Marques, Carlos Alberto F. 
José Pontes, Maria 
Kalli, Kyriacos 
Frizera, Anselmo 
Major Field of Science: Engineering and Technology
Field Category: Materials Engineering
Keywords: Annealing;Fiber Bragg gratings;Hysteresis;Polymer optical fiber
Issue Date: 1-Sep-2018
Source: Journal of Lightwave Technology, 2018, vol. 36, no. 17, pp. 3611-3617
Volume: 36
Issue: 17
Start page: 3611
End page: 3617
Journal: Journal of Lightwave Technology 
Abstract: The influence of annealing under different humidity conditions on temperature, strain and transverse force performance of polymer optical fiber Bragg gratings (POFBG) inscribed in cyclic transparent amorphous fluoropolymers (CYTOPs) is presented. The POFBG are imprinted using direct-write, plane-by-plane femtosecond laser inscription method. Further improvement to the sensor's performance, with respect to sensitivity, linearity, and hysteresis, is obtained with a simple technique based on polymer viscoelastic response applied to the annealed POFBGs. The sensors were characterized for temperature, strain and transverse force after annealing and results show that sensors annealed under water have the lowest hysteresis. Additionally, the temperature sensitivity increased when the sensor was annealed in low humidity conditions. Finally, for strain and transverse force, the highest sensitivity was obtained in POFBG sensors annealed under water. The compensation technique did not show a substantial decrease in hysteresis response for applied strain tests; however, for temperature and transverse force tests, the hysteresis decreased by more than 2 and 4 times, respectively.
ISSN: 0733-8724
DOI: 10.1109/JLT.2018.2842461
Rights: © IEEE
Type: Article
Affiliation : Cyprus University of Technology 
University of Aveiro 
Federal University of Espirito Santo 
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