Title :
Long-period fiber gratings with overlay of variable refractive index
Author :
Del Villar, Ignacio ; Matias, Ignacio R. ; Arregui, Francisco J.
Author_Institution :
Electr. & Electron. Eng. Dept., Univ. Publica de Navarra, Pamplona, Spain
Abstract :
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.
Keywords :
coupled mode analysis; diffraction gratings; fibre optic sensors; optical design techniques; optical fibre cladding; refractive index; coupled-mode theory; fiber gratings; long-period gratings; optical design; optical fiber sensors; overlay thickness; resonance wavelength sensitivity; variable refractive index; Bragg gratings; Fiber gratings; Magnetic materials; Optical fiber communication; Optical fiber sensors; Optical fiber theory; Optical materials; Optical sensors; Refractive index; Resonance; Coupled-mode analysis; gratings; optical fiber sensors; thin films;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2005.853283
