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Proceedings Paper

Two regimes of grating regeneration in hydrogen loaded photosensitive fiber
Author(s): Leonhard Polz; Quang Nguyen; Hartmut Bartelt; Johannes Roths
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Paper Abstract

In a highly Ge doped photosensitive fiber, co doped with phosphorus and fluorine and with a doped inner cladding, we observed, during annealing experiments, an anomalous variation of the FBG strength as a function of temperature and time. This characteristic only occurred when the fiber had been loaded with hydrogen. During a stepwise temperature increase from room temperature to 1200°C, the gratings showed, after an initial thermal decay, in two distinct temperature ranges a significant increase in reflectivity with time. One range with an increase in reflectivity was found between 850°C and 1000°C. The behaviors of the FBGs in this range were very similar to that known from chemical composition or regenerated gratings. Another temperature range with increasing reflectivity was found between 500°C and 700°C, followed by a strong decrease in reflectivity at temperatures between 750°C to 800°C. Both regimes of regeneration might be associated with changes in the core and doped inner cladding of this type of fiber.

Paper Details

Date Published: 20 May 2013
PDF: 4 pages
Proc. SPIE 8794, Fifth European Workshop on Optical Fibre Sensors, 879420 (20 May 2013); doi: 10.1117/12.2025857
Show Author Affiliations
Leonhard Polz, Munich Univ. of Applied Sciences (Germany)
Quang Nguyen, Munich Univ. of Applied Sciences (Germany)
Hartmut Bartelt, Institute of Photonic Technology (Germany)
Johannes Roths, Munich Univ. of Applied Sciences (Germany)


Published in SPIE Proceedings Vol. 8794:
Fifth European Workshop on Optical Fibre Sensors
Leszek R. Jaroszewicz, Editor(s)

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