Title :
Long period grating directional bend sensor based on asymmetric index modification of cladding
Author :
Allsop, T. ; Dubov, M. ; Martinez, A. ; Floreani, F. ; Khrushchev, I. ; Webb, D.J. ; Bennion, I.
Author_Institution :
Photonics Res. Group, Aston Univ., Birmingham, UK
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.
Keywords :
diffraction gratings; fibre optic sensors; high-speed optical techniques; optical fibre cladding; refractive index; sensitivity; shape measurement; applied curvature orientation; asymmetric index modification; blue wavelength shift; cladding; femtosecond laser; long period grating directional bend sensor; red wavelength shift; refractive index; sensitivity; shape sensor; standard optical fibre;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:20056996
