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Proceedings Paper

Differential sensitivity characteristics of tilted fiber Bragg grating sensors
Author(s): C. Chen; L. Xiong; A. Jafari; J. Albert
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Paper Abstract

Fiber Bragg gratings with grating planes tilted at small angles relative to the fiber axis couple light both to backward propagating core modes and cladding modes. The resonant wavelengths for these mode couplings depend differentially on external perturbations. Using the core mode back reflection resonance as a reference wavelength, the relative shift of the cladding mode resonances can be used to selectively measure perturbations affecting the region outside the cladding independently of temperature. We have measured a relative wavelength shift lower than 0.4 pm/degree in conventional single mode fiber while the sensitivity to external changes in refractive index can be larger than 300 pm per % index change. Experimental results on the bending selective sensitivity (relative to uniform axial strain) are also reported.

Paper Details

Date Published: 10 November 2005
PDF: 10 pages
Proc. SPIE 6004, Fiber Optic Sensor Technology and Applications IV, 60040B (10 November 2005); doi: 10.1117/12.629975
Show Author Affiliations
C. Chen, Carleton Univ. (Canada)
L. Xiong, Carleton Univ. (Canada)
A. Jafari, Carleton Univ. (Canada)
J. Albert, Carleton Univ. (Canada)


Published in SPIE Proceedings Vol. 6004:
Fiber Optic Sensor Technology and Applications IV
Michael A. Marcus; Brian Culshaw; John P. Dakin, Editor(s)

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