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dc.contributor.authorIoannou, Andreas-
dc.contributor.authorTheodosiou, Antreas-
dc.contributor.authorKalli, Kyriacos-
dc.contributor.authorCaucheteur, Christophe-
dc.identifier.citation(2018) Proceedings of SPIE - The International Society for Optical Engineering, 10680, art. no. 106801S; Optical Sensing and Detection V, 2018, 23-26 April, Strasbourg, Franceen_US
dc.description.abstractIn this work, 5-mm long TFBGs were inscribed in photosensitive single-mode optical fiber using the direct writing plane-by-plane femtosecond laser inscription method; a flexible inscription approach that enables absolute control of the grating period, length, angle, width and depth of the grating planes. This new fabrication method brings important differences compared to classical inscription methods. Firstly, these gratings exhibit very low photo-induced birefringence (measured ∼8pm) and as we rely on a direct writing process, the tilt angle of the inscribed grating does not affect the Bragg wavelength, allowing for precise positioning. In addition, this method enables the high order grating production, allowing a behavioral study of higher order cladding modes located at lower wavelengths in the 1200-1600 nm range. 8th order gratings were produced with cladding and Bragg mode resonances in the C+L bands. The temperature and strain sensitivities were measured for both the Bragg and higher order cladding modes, yielding an exceptional performance. The higher order modes exhibit a negative axial strain, up to-1.99nm (more than two times higher than the standard Bragg peaks) and a solid temperature sensitivity of 10.25 pm/°C: At the same time, for the designed order cladding modes (of the 8th) the refractive index sensitivity is measured at 22 nm/RIU.en_US
dc.relation.ispartofProceedings of SPIE - The International Society for Optical Engineeringen_US
dc.rights© 2018 SPIE.en_US
dc.subjectHigher order cladding modesen_US
dc.subjectOptical fiber sensorsen_US
dc.subjectTilted fiber Bragg gratingsen_US
dc.titleSensing capabilities of higher order cladding modesen_US
dc.typeConference Papersen_US
dc.collaborationUniversity of Monsen_US
dc.collaborationCyprus University of Technologyen_US
dc.subject.categoryElectrical Engineering - Electronic Engineering - Information Engineeringen_US
dc.subject.fieldEngineering and Technologyen_US
dc.publicationPeer Revieweden_US
dc.relation.conferenceOptical Sensing and Detection Ven_US
item.fulltextNo Fulltext-
crisitem.journal.publisherSPIE- of Electrical Engineering, Computer Engineering and Informatics- of Engineering and Technology- of Engineering and Technology-
Appears in Collections:Δημοσιεύσεις σε συνέδρια/Conference papers
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