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Proceedings Paper

Oscillatory behaviour in Type IA FBG: ruling out chemical complexity
Author(s): George Simpson; Kyriacos Kalli; John Canning; Amedee Lacraz
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Paper Abstract

Type IA FBG are regenerated gratings that appear in hydrogenated germanosilicate fibre of all types during prolonged UV exposure. The gratings are characterised by a large Bragg wavelength shift and a concomitant increase in the mean fibre core index. Modulated index changes are complex by comparison and significantly weaker, often characterised by oscillatory growth behaviour. Low thermal stability of Type IA gratings suggests a possible chemical role similar to thermally processed optical fibres where autocatalysis has been observed. We show that GeOH and SiOH formation are not out-of-phase and follow each other, with no evidence of autocatalysis, ruling out a chemical origin.

Paper Details

Date Published: 28 September 2015
PDF: 4 pages
Proc. SPIE 9634, 24th International Conference on Optical Fibre Sensors, 96345L (28 September 2015); doi: 10.1117/12.2195101
Show Author Affiliations
George Simpson, Deloitte Touche Tohmatsu (Australia)
Kyriacos Kalli, Cyprus Univ. of Technology (Cyprus)
John Canning, The Univ. of Sydney (Australia)
Amedee Lacraz, Cyprus Univ. of Technology (Cyprus)

Published in SPIE Proceedings Vol. 9634:
24th International Conference on Optical Fibre Sensors
Hypolito José Kalinowski; José Luís Fabris; Wojtek J. Bock, Editor(s)

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