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Proceedings Paper

Femtosecond point-by-point inscription of 3D FBG arrays in 7-core fibers with straight and twisted cores
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Paper Abstract

We present the results on fabrication of 3D fiber Bragg grating (FBG) arrays in specialty 7-core optical fibers with straight or twisted (spun) cores. Femtosecond laser inscription technology allowed us to modify the fibers through the acrylate or polyimide protective coatings that significantly increases the durability of the FBG sensors as compared to conventional UV inscription approach, requiring the coating removal. Custom-made 7-core fiber with polyimide coating opens up new prospects for shape sensors operating in high-temperature environment. Twisted-core fiber makes it possible to measure not only the shape, but also the direction of fiber torsion that is essential for a free-standing sensors. A novel method enabling core-selective FBGs inscription in a 7-core spun optical fiber is presented in this work. By using the created sensors bending radii down to several millimeters can be measured with a high precision. Separation of different core FBGs by wavelength makes it possible to combine several cores during their interrogation, which allows for sensor measurements through a single optical port.

Paper Details

Date Published: 28 August 2019
PDF: 6 pages
Proc. SPIE 11199, Seventh European Workshop on Optical Fibre Sensors, 1119934 (28 August 2019); doi: 10.1117/12.2540925
Show Author Affiliations
Alexey Wolf, Novosibirsk State Univ. (Russian Federation)
Institute for Automation and Electrometry of the SB RAS (Russian Federation)
Kirill Bronnikov, Novosibirsk State Univ. (Russian Federation)
Institute for Automation and Electrometry of the SB RAS (Russian Federation)
Sergey Yakushin, Novosibirsk State Univ. (Russian Federation)
Alexandr Dostovalov, Novosibirsk State Univ. (Russian Federation)
Institute for Automation and Electrometry of the SB RAS (Russian Federation)
Sergey Zhuravlev, Fiber Optics Research Ctr. of the RAS (Russian Federation)
Mikhail Salganskii, G. G. Devyatykh Institute of Chemistry of High-Purity Substances (Russian Federation)
Olga Egorova, A. M. Prokhorov General Physics Institute of the RAS (Russian Federation)
Sergey Semjonov, Fiber Optics Research Ctr. of the RAS (Russian Federation)
Sergey Babin, Novosibirsk State Univ. (Russian Federation)
Institute of Automation and Electrometry of the SB RAS (Russian Federation)


Published in SPIE Proceedings Vol. 11199:
Seventh European Workshop on Optical Fibre Sensors
Kyriacos Kalli; Sinead O. O'Keeffe; Gilberto Brambilla, Editor(s)

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