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Modal sensitivity enhancement of few-mode fiber Bragg gratings for refractive index measurement

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Show simple item record Ali, Muhammad Mahmood Memon, Sanober F Lewis, Elfed Lim, Kok-Sing Ahmad, Harith 2020-04-29T10:56:55Z 2020-04-29T10:56:55Z 2010
dc.description peer-reviewed en_US
dc.description.abstract Few-mode fibers (FMFs) offer several distinct features from single mode fibers and multimode fibers, in terms of medium core size which is capable of accommodating several transverse modes (2-6 modes). In this work, fiber Bragg grating (FBG) has been inscribed in FMF which exhibits more than one resonant Bragg wavelengths. Few-mode fiber Bragg grating (FM-FBG) can be used as sensing device because of its modal sensitivity to the changes in an ambient environment, such as temperature and refractive index in terms of concentration of the solution. To increase its modal sensitivity for solution concentration, the cladding of FM-FBG is removed, and the Bragg wavelength difference of the modes increases during the etching process. It has been observed that by decreasing the core radius through chemical etching, the Bragg wavelength difference of respective modes increases whereas the power confinement ratio in the core for the respective modes decreases. Therefore we have optimized the core radius as at approximately 7 μm for the enhancement of refractive index modal sensitivities. The fabricated sensor has been characterized with the different concentrations of sodium chloride (NaCl (aq) ) solution en_US
dc.language.iso eng en_US
dc.publisher IEEE Computer Society en_US
dc.relation.ispartofseries 2016 International Conference for Students on Applied Engineering (ICSAE);
dc.relation.uri 10.1109/ICSAE.2016.7810208
dc.rights © 2010 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. en_US
dc.subject optical fiber sensors en_US
dc.subject optical fiber couplers en_US
dc.subject refractive index en_US
dc.subject sensitivity en_US
dc.subject etching en_US
dc.title Modal sensitivity enhancement of few-mode fiber Bragg gratings for refractive index measurement en_US
dc.type info:eu-repo/semantics/article en_US
dc.type.supercollection all_ul_research en_US
dc.type.supercollection ul_published_reviewed en_US
dc.identifier.doi 10.1109/ICSAE.2016.7810208
dc.contributor.sponsor ERC en_US
dc.rights.accessrights info:eu-repo/semantics/openAccess en_US

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