Long period grating directional bend sensor based on asymmetric index modification of cladding


A long period grating (LPG) written in a standard optical fibre was modified by using a femtosecond laser to induce an asymmetric change in the cladding's refractive index. This device produced blue and red wavelength shifts depending on the orientation of applied curvature, with maximum sensitivities of -1.6 nm m and +3.8 nm m, suggesting that this type of LPG may be useful as a shape sensor.

Uncontrolled Keywords: Cladding, finite element method, light sources, optical fibers, photosensitivity, refractive index, spectrum analyzers, standards, waveguides, concave bending, curvature sensors, long period grating, transmission spectrum
Publication ISSN: 0013-5194
Last Modified: 23 Oct 2019 10:59
Date Deposited: 07 Jul 2010 13:35
Published Date: 2005-01-20
Authors: Allsop, Thomas D.P.
Dubov, Mykhaylo
Martínez, Amós
Floreani, Filip
Khrushchev, Igor
Webb, David J.
Bennion, Ian


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