title: Dependence of temperature and strain coefficients on fiber grating type and its application to simultaneous temperature and strain measurement.
abstract: We report an investigation of the dependence of the temperature and strain coefficients on the grating type for fiber Bragg gratings that are UV inscribed in B/Ge-codoped fiber with and without hydrogenation. The results reveal that all types of grating exhibit similar strain sensitivities but markedly different temperature sensitivities, greater for gratings inscribed in hydrogen-free rather than hydrogenated fiber and substantially less in type IA gratings than all others. The sensitivity characteristics of these gratings have been used to implement a new type of dual-grating sensor for simultaneous measurement of temperature and strain that has properties superior to those of previously reported structures.
authors.forename: Xuewen
authors.initials: X
authors.lastname: Shu
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.forename: Donghui
authors.initials: D
authors.lastname: Zhao
authors.forename: Bashir
authors.initials: B
authors.lastname: Gwandu
authors.forename: Filip
authors.initials: F
authors.lastname: Floreani
authors.forename: Lin
authors.initials: L
authors.lastname: Zhang
authors.forename: Ian
authors.initials: I
authors.lastname: Bennion