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Sensors 2016, 16(9), 1357; doi:10.3390/s16091357

Investigation of a Fiberoptic Device Based on a Long Period Grating in a Ring Resonator

Photonics Research Group, Department of Electrical and Information Engineering, Politecnico di Bari, via E. Orabona n. 4, Bari 70125, Italy
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Author to whom correspondence should be addressed.
Academic Editors: Christophe Caucheteur and Tuan Guo
Received: 20 June 2016 / Revised: 13 August 2016 / Accepted: 19 August 2016 / Published: 24 August 2016
(This article belongs to the Special Issue Recent Advances in Fiber Bragg Grating Sensing)
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Abstract

A fiberoptic architecture based on a ring resonator (RR) including a typical long period grating (LPG) was investigated. The interactions between the fundamental core mode (LP01 or HE11) coupled to the RR and the cladding mode (LP08), excited into the cavity by means of the LPG, allow a peculiar spectral response characterized by two splitting resonances to be achieved. The new LPGRR architecture is investigated theoretically and a mathematical modelling based on the transfer matrix method (TMM) is proposed. The theoretical results are compared with the experiments measured by an open-loop LPG, while the performance of the relative LPGRR was estimated by a theoretical parametric analysis. Finally, an overview of the possible LPGRR sensing applications is provided by investigating the features of a strain sensor operating in different environmental conditions. View Full-Text
Keywords: long period grating (LPG); ring resonator (RR); transfer matrix method (TMM); optical fiber sensor; strain; refractive index (RI) long period grating (LPG); ring resonator (RR); transfer matrix method (TMM); optical fiber sensor; strain; refractive index (RI)
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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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MDPI and ACS Style

Corcione, C.; Troia, B.; De Leonardis, F.; Passaro, V.M.N. Investigation of a Fiberoptic Device Based on a Long Period Grating in a Ring Resonator. Sensors 2016, 16, 1357.

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