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Title: Plane-by-Plane femtosecond laser inscription method for single-peak Bragg gratings in multimode CYTOP polymer optical fibre
Authors: Theodosiou, Antreas 
Lacraz, Amédéé 
Stassis, Andreas 
Koutsides, Charalambos 
Komodromos, Michael 
Kalli, Kyriacos 
Keywords: Optical sensing and sensors;Polymer waveguides;Fiber optics sensors;Fibre Bragg gratings
Category: Mechanical Engineering
Field: Engineering and Technology
Issue Date: 22-Nov-2017
Publisher: IEEE
Source: Journal of Lightwave Technology, Volume 35, Issue 24, December 15 2017, Pages 5404 - 5410
Abstract: We report on the development and characterization of single peak fiber Bragg gratings (FBGs) in polymer optical fiber (POF). We use a multimode gradient index cyclic transparent optical polymer (CYTOP) fiber, where the FBGs are inscribed with a femtosecond laser. We adapt the direct-write, plane-by-plane inscription method, where the beam is scanned transversely across the core, to create refractive index changes. In order to reduce the number of fiber modes coupling to the grating, we limit the FBG's spatial extent to the central part of the core, in the region where the gradient index profile peaks. In this way, we are able to excite the strongest lower order modes thereby generating single peak POF-FBG spectra. We support our experimental results with modeling using the bi-directional beam propagation method (Bi-BPM). Furthermore, a FBG array is used as a quasi-distributed sensor, recovering the vibration response of a freely suspended metal beam, using a 6-m sensing strand. The FBGs are multiplexed using a high-speed commercial wavelength demodulator, the output of which provides wavelength- and time-dependent displacement information. The results are compared directly with the performance of a silica-fiber-based FBG sensor array, and show a significant sensor sensitivity improvement for the polymer fiber to dynamic strain.
ISSN: 0733-8724
DOI: 10.1109/JLT.2017.2776862
Rights: © Copyright 2018 IEEE - All rights reserved. Use of this web site signifies your agreement to the terms and conditions.
Type: Article
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