Two regimes of grating regeneration in hydrogen loaded photosensitive fiber

Leonhard Polz; Quang Nguyen; Hartmut Bartelt; Johannes Roths

doi:10.1117/12.2025857

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20 May 2013 Two regimes of grating regeneration in hydrogen loaded photosensitive fiber

Leonhard Polz, Quang Nguyen, Hartmut Bartelt, Johannes Roths

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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, Quang Nguyen, Hartmut Bartelt, and 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); https://doi.org/10.1117/12.2025857

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