Numerical analysis of GeO2-concentration effects in arc-induced long-period fiber gratings under external refractive-index changes

We present a numerical analysis of the response of arc-induced long-period fiber gratings (LPFGs) under ambient refractive-index changes using standard fibers with SiO 2 as cladding material and different GeO 2 concentration in the SiO 2 -GeO 2 doped core. We obtain that the LPFG-sensitivity is incr...

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Bibliographic Details
Published in:Optical review (Tokyo, Japan) Japan), 2014-03, Vol.21 (2), p.143-149
Main Authors: Guzman-Ramos, Valentin, Ceballos-Herrera, Daniel E., Selvas-Aguilar, Romeo
Format: Article
Language:English
Subjects:
Atomic
Lasers
Microwaves
Molecular
Optical and Plasma Physics
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Quantum Optics
Regular Papers
RF and Optical Engineering
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Summary:We present a numerical analysis of the response of arc-induced long-period fiber gratings (LPFGs) under ambient refractive-index changes using standard fibers with SiO 2 as cladding material and different GeO 2 concentration in the SiO 2 -GeO 2 doped core. We obtain that the LPFG-sensitivity is increased using lower GeO 2 concentrations and it follows a parabolic behavior. Also, we identify two linear regimes using an external index of 1.37: for GeO 2 concentrations between 2 and 3.5 mol %, the LPFG-sensitivity changes with a rate of 3.614 nm per mole fraction of GeO 2 , while for higher concentrations the sensitivity changes with a rate of 1.39 nm/mol %. Additionally, for fibers with 2 mol% of GeO 2 , the sensitivity calculated is comparable to this obtained in previous works using corrugated and tapered LPFGs in SMF28 fibers. These results are of interest for the design of improved LPFG-sensors.
ISSN:1340-6000
1349-9432
DOI:10.1007/s10043-014-0022-0