Journal
OPTICS LETTERS
Volume 44, Issue 16, Pages 4036-4039Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.44.004036
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- Fonds De La Recherche Scientifique - FNRS [O001518F, 30467715]
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Type-I fiber Bragg gratings photo-inscribed in hydrogen-loaded B/Ge co-doped silica single-mode optical fibers have been regenerated efficiently at 450 degrees C, which is the lowest temperature reported so far. The mechanical strength of the annealed fiber is preserved while ensuring temperature sensing of the regenerated gratings up to 900 degrees C. Unlike low temperature cycles (<= 600 degrees C), an annealing process at higher temperatures revealed faster regeneration for strong gratings. Changes in grating strength were also measured before the regeneration cycle. These behaviors suggest the contribution of different mechanisms to the regeneration process with different relative dynamics. (C) 2019 Optical Society of America.
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