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Title: Strain sensing with femtosecond inscribed FBGs in perfluorinated polymer optical fibers
Authors: Stajanca, Pavol 
Lacraz, Amédéé 
Kalli, Kyriacos 
Schukar, Marcus 
Krebber, Katerina 
Major Field of Science: Natural Sciences
Field Category: Physical Sciences;Electrical Engineering - Electronic Engineering - Information Engineering
Keywords: Cytop;Fiber Bragg gratings;Fiber optics sensors;Perfluorinated polymer optical fiber;Strain sensitivity
Issue Date: 29-Apr-2016
Source: (2016) Proceedings of SPIE - The International Society for Optical Engineering, 9899, art. no. 989911; Optical Sensing and Detection IV; Brussels; Belgium; 3 April 2016 through 7 April 2016
Conference: Optical Sensing and Detection IV 
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.
ISBN: 978-151060144-4
ISSN: 0277-786X
DOI: 10.1117/12.2225081
Rights: © 2016 SPIE.
Type: Conference Papers
Affiliation : BAM Federal Institute for Materials Research and Testing 
Cyprus University of Technology 
Appears in Collections:Δημοσιεύσεις σε συνέδρια /Conference papers or poster or presentation

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