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Proceedings Paper

Strain sensing with femtosecond inscribed FBGs in perfluorinated polymer optical fibers
Author(s): P. Stajanca; A. Lacraz; K. Kalli; M. Schukar; K. Krebber
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Paper Abstract

In this work, the potential of fiber Bragg gratings (FBGs) in low-loss perfluorinated polymer optical fibers (PF-POFs) is explored. The FBG is femtosecond-inscribed in a commercial multi-mode (MM) PF-POF based on Cytop polymer. Femtosecond inscription leads to creation of a highly saturated grating with a number of higher order reflection peaks visible throughout the visible and near-infrared spectral region. For 2 mm long FBG having a pitch of 2.2895 μm, a total of nine higher-order MM reflection bands are visible spanning from 1548 nm (4th order) to 520 nm (12th order). Strain sensitivity was measured for 6 peak bands in 500-900 nm region, where relatively low cost CCD based spectrometers and broadband LEDs are available. Strain sensitivity increases almost linearly with increasing initial peak wavelength, growing from 4.82 ± 0.02 nm/% measured for 12th order peak at 517 nm to 8.12 ± 0.04 nm/% measured for 7th order peak at 883 nm. These values correspond to roughly 20 % higher sensitivity than silica FBGs exhibit in this spectral range. The gratings in PF-POFs combine the higher strain sensitivity and low-loss operation while maintaining the mechanical advantages of polymer optical fibers. Therefore, they hold a high potential for considerable broadening of polymer optical fiber Bragg gratings application range.

Paper Details

Date Published: 29 April 2016
PDF: 7 pages
Proc. SPIE 9899, Optical Sensing and Detection IV, 989911 (29 April 2016); doi: 10.1117/12.2225081
Show Author Affiliations
P. Stajanca, Bundesanstalt für Materialforschung und -prüfung (Germany)
A. Lacraz, Cyprus Univ. of Technology (Cyprus)
K. Kalli, Cyprus Univ. of Technology (Cyprus)
M. Schukar, Bundesanstalt für Materialforschung und -prüfung (Germany)
K. Krebber, Bundesanstalt für Materialforschung und -prüfung (Germany)

Published in SPIE Proceedings Vol. 9899:
Optical Sensing and Detection IV
Francis Berghmans; Anna G. Mignani, Editor(s)

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