Abstract

In this paper, the thermal aging of temperature-resistant Bragg gratings inscribed in nitrogen-doped silica-core fibers was investigated. The results were compared with their analogues inscribed in pristine weakly germanium-doped fibers. The two-step nature of the nitrogen-doped samples’ thermal decay was observed. A study of the changes in the Bragg wavelength during high-temperature annealing was conducted as well.

© 2019 Optical Society of America

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