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Sensors 2018, 18(3), 918; https://doi.org/10.3390/s18030918

Arc-Induced Long Period Gratings from Standard to Polarization-Maintaining and Photonic Crystal Fibers

1
Department of Engineering, University of Naples “Parthenope”, Centro Direzionale Isola C4, 80143 Napoli, Italy
2
Institute for Microelectronics and Microsystems, National Research Council, 80131 Napoli, Italy
*
Author to whom correspondence should be addressed.
Received: 26 February 2018 / Revised: 15 March 2018 / Accepted: 18 March 2018 / Published: 20 March 2018
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Italy 2017)
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Abstract

In this work, we report about our recent results concerning the fabrication of Long Period Grating (LPG) sensors in several optical fibers, through the Electric Arc Discharge (EAD) technique. In particular, the following silica fibers with both different dopants and geometrical structures are considered: standard Ge-doped, photosensitive B/Ge codoped, P-doped, pure-silica core with F-doped cladding, Panda type Polarization-maintaining, and Hollow core Photonic crystal fiber. An adaptive platform was developed and the appropriate “recipe” was identified for each fiber, in terms of both arc discharge parameters and setup arrangement, for manufacturing LPGs with strong and narrow attenuation bands, low insertion losses, and short length. As the fabricated devices have appealing features from the application point of view, the sensitivity characteristics towards changes in different external perturbations (i.e., surrounding refractive index, temperature, and strain) are investigated and compared, highlighting the effects of different fiber composition and structure. View Full-Text
Keywords: long period gratings; optical fibers; optical fiber sensors; refractive index sensors; sensors fabrication; strain sensors; temperature sensors long period gratings; optical fibers; optical fiber sensors; refractive index sensors; sensors fabrication; strain sensors; temperature sensors
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Esposito, F.; Ranjan, R.; Campopiano, S.; Iadicicco, A. Arc-Induced Long Period Gratings from Standard to Polarization-Maintaining and Photonic Crystal Fibers. Sensors 2018, 18, 918.

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