Observations from direct UV-written, non-hydrogen-loaded, thermally regenerated Bragg gratings in double-clad photosensitive fiber

In this Letter, experimental evidence is provided for an enhanced thermal sensitivity for a double thermal regeneration feature in fiber Bragg gratings fabricated by direct ultraviolet (UV) writing. Here 47 gratings of varying fluence and wavelength were written along a double-clad, germanium-doped...

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Veröffentlicht in:Optics letters 2017-10, Vol.42 (19), p.3741-3744
Hauptverfasser: Jantzen, Alexander, Bannerman, Rex H S, Berry, Sam A, Gates, James C, Gow, Paul C, Boyd, Lewis J, Smith, Peter G R, Holmes, Christopher
Format: Artikel
Sprache:eng
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Zusammenfassung:In this Letter, experimental evidence is provided for an enhanced thermal sensitivity for a double thermal regeneration feature in fiber Bragg gratings fabricated by direct ultraviolet (UV) writing. Here 47 gratings of varying fluence and wavelength were written along a double-clad, germanium-doped core fiber. Subsequently thermal processing without hydrogen loading the fiber was performed and thermal treatment was carried out in a pure oxygen environment. Thermal sensitivity for the double regeneration increased from 13.6±0.3  pm/°C to 21.3±0.2  pm/°C. Furthermore, one of the highest nominal fluence gratings, #45, exhibited a regeneration factor of 1.73.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.42.003741