Bragg gratings in ternary SiO<sub>2</sub> SnO<sub>2</sub> Na<sub>2</sub>O optical glass fibers

Bragg gratings in ternary SiO<sub>2</sub> SnO<sub>2</sub> Na<sub>2</sub>O optical glass fibers

Bragg gratings have been written in an optical fibre with a core made of ternary SiO<sub>2</sub>:SnO<sub>2</sub>:Na<sub>2</sub>O glass and a SiO<sub>2</sub> cladding. The presence of Na<sub>2</sub>O allows for higher concentrations of SnO&l...

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Bibliographic Details
Main Authors:	Brambilla, G. (Author), Pruneri, V. (Author), Reekie, L. (Author), Contardi, C. (Author), Milanese, D. (Author), Ferraris, M. (Author)
Format:	Article
Language:	English
Published:	2000.
Subjects:	Article
Online Access:	Get fulltext

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Summary:	Bragg gratings have been written in an optical fibre with a core made of ternary SiO<sub>2</sub>:SnO<sub>2</sub>:Na<sub>2</sub>O glass and a SiO<sub>2</sub> cladding. The presence of Na<sub>2</sub>O allows for higher concentrations of SnO<sub>2</sub> which is believed to be responsible for the photorefractive response of this composition. In these preliminary experiments significant refractive index modulations, up to 6.2x10<sup>-4</sup>, have been achieved using a 248nm excimer laser and a phase mask to write gratings for reflectivity at around 1.5µm. The induced refractive index changes show enhanced temperature stability and there is no sign of any erasure up to temperatures exceeding 600°C.