20 May 2013 Two regimes of grating regeneration in hydrogen loaded photosensitive fiber
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Proceedings Volume 8794, Fifth European Workshop on Optical Fibre Sensors; 879420 (2013) https://doi.org/10.1117/12.2025857
Event: Fifth European Workshop on Optical Fibre Sensors, 2013, Krakow, Poland
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.
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Leonhard Polz, Leonhard Polz, Quang Nguyen, Quang Nguyen, Hartmut Bartelt, Hartmut Bartelt, Johannes Roths, Johannes Roths, } "Two regimes of grating regeneration in hydrogen loaded photosensitive fiber", Proc. SPIE 8794, Fifth European Workshop on Optical Fibre Sensors, 879420 (20 May 2013); doi: 10.1117/12.2025857; https://doi.org/10.1117/12.2025857
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