Thermal decay of Bragg gratings written in N-doped-silica-core fibers

Butov, Oleg V.; Golant, K. M.; Gousev, Yaroslav V.; Sokolov, A. N.; Niay, P.; Hidayat, Arif; Douay, M.

doi:10.1117/12.623417

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Temperature-resistant Bragg Gratings In Nitrogen-doped Silic...1

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2006

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“…The backbone of this model is as follows: the photoexcitation of valence electrons makes nitrogen atoms mobile for some time and they diffuse through the glass network from core to cladding of the optical fibre. This leads to a corrugation of the nitrogen concentration profile along the fibre core and thus to a modulation of the fibre effective refractive index that causes the Bragg grating to appear [10]. Changes in the network configuration of atoms within the glass appear to be responsible for the effective refractive index change in N-doped fibres as the result of photoexcitation.…”

Section: Temperature-resistant Bragg Gratings In Nitrogen-doped Silic...mentioning

confidence: 99%

Nitrogen-doped silica-core fibres for Bragg grating sensors operating at elevated temperatures

Butov

Dianov

Golant

2006

Meas. Sci. Technol.

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Nitrogen-doped silica-core fibre is discussed in the context of a technological basis for the fabrication of Bragg gratings for sensors with enhanced temperature resistance up to 900 °C. To estimate the applicability of this fibre type for the manufacture of high-temperature Bragg grating sensors, the following features are analysed: technology for fabricating fibre preforms, fibre characteristics and particularities of Bragg gratings written therein. Experimental data on the degradation of the gratings' characteristics resulting from a long-term (up to 4 months) annealing at elevated temperatures are presented and discussed. The practical application of this type of sensor in thermometry is given as an example.

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Section: Temperature-resistant Bragg Gratings In Nitrogen-doped Silic...mentioning

confidence: 99%