Optimization of sensitivity in Long Period Fiber Gratings with overlay deposition
Optics Express, Vol. 13, Issue 1, pp. 56-69 (2005)
http://dx.doi.org/10.1364/OPEX.13.000056
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Abstract
The deposition of an overlay of higher refractive index than the cladding in a Long Period Fiber Grating (LPFG) permits to improve the sensitivity to ambient refractive index changes in a great manner. When the overlay is thick enough, one of the cladding modes is guided by the overlay. This causes important shifts in the effective index values of the cladding modes, and henceforward fast shifts of the resonance wavelength of the attenuations bands in the transmission spectrum. This could be applied for improving the sensitivity of LPFG sensors. The problem is analysed with a numerical method based on LP mode approximation and coupled mode theory, which agrees with so far published experimental results.
© 2005 Optical Society of America
OCIS Codes
(050.2770) Diffraction and gratings : Gratings
(060.2430) Fiber optics and optical communications : Fibers, single-mode
(260.2110) Physical optics : Electromagnetic optics
(310.1860) Thin films : Deposition and fabrication
ToC Category:
Research Papers
History
Original Manuscript: November 8, 2004
Revised Manuscript: December 20, 2004
Published: January 10, 2005
Citation
Ignacio Del Villar, Ignacio Matías, Francisco Arregui, and Philippe Lalanne, "Optimization of sensitivity in Long Period Fiber Gratings with overlay deposition," Opt. Express 13, 56-69 (2005)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-13-1-56
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