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

Allsop, Thomas D.P., Dubov, Mykhaylo, Martínez, Amós, Floreani, Filip, Khrushchev, Igor, Webb, David J. and Bennion, Ian (2005). Long period grating directional bend sensor based on asymmetric index modification of cladding. Electronics letters, 41 (2), pp. 59-60.

Abstract

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
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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