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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 13, Iss. 1 — Jan. 10, 2005
  • pp: 56–69

Optimization of sensitivity in Long Period Fiber Gratings with overlay deposition

Ignacio Del Villar, Ignacio R. Matías, Francisco J. Arregui, and Philippe Lalanne  »View Author Affiliations

Optics Express, Vol. 13, Issue 1, pp. 56-69 (2005)

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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

Original Manuscript: November 8, 2004
Revised Manuscript: December 20, 2004
Manuscript Accepted: December 20, 2004
Published: January 10, 2005

Ignacio Del Villar, Ignacio R. Matías, Francisco J. Arregui, and Philippe Lalanne, "Optimization of sensitivity in Long Period Fiber Gratings with overlay deposition," Opt. Express 13, 56-69 (2005)

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