Long-period fiber gratings with overlay of variable refractive index

A theoretical analysis is presented of a long-period fiber grating (LPFG) with an overlay of variable refractive index. The highest sensitivity of the resonance wavelengths to variations in the refractive index of the overlay can be optimized. There are two key points for a good design: the selectio...

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Bibliographic Details
Published in:IEEE photonics technology letters 2005-09, Vol.17 (9), p.1893-1895
Main Authors: Del Villar, I., Matias, I.R., Arregui, F.J.
Format: Article
Language:English
Subjects:
Bragg gratings
Cladding
Coupled-mode analysis
Design engineering
Fiber gratings
Fibers
gratings
Joining
Magnetic materials
Numerical analysis
Optical fiber communication
Optical fiber sensors
Optical fiber theory
Optical materials
Optical sensors
Refractive index
Refractivity
Resonance
thin films
Wavelengths
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Summary:A theoretical analysis is presented of a long-period fiber grating (LPFG) with an overlay of variable refractive index. The highest sensitivity of the resonance wavelengths to variations in the refractive index of the overlay can be optimized. There are two key points for a good design: the selection of an overlay refractive index close to that of the cladding of the LPFG and the overlay thickness. The problem is analyzed with a numerical method based on coupled-mode theory.
ISSN:1041-1135
1941-0174
DOI:10.1109/LPT.2005.853283