10 November 2005 Differential sensitivity characteristics of tilted fiber Bragg grating sensors
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Proceedings Volume 6004, Fiber Optic Sensor Technology and Applications IV; 60040B (2005); doi: 10.1117/12.629975
Event: Optics East 2005, 2005, Boston, MA, United States
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.
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C. Chen, L. Xiong, A. Jafari, J. Albert, "Differential sensitivity characteristics of tilted fiber Bragg grating sensors", Proc. SPIE 6004, Fiber Optic Sensor Technology and Applications IV, 60040B (10 November 2005); doi: 10.1117/12.629975; https://doi.org/10.1117/12.629975
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KEYWORDS
Cladding

Sensors

Fiber Bragg gratings

Refractive index

Thin films

Fiber optics sensors

Radio propagation

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