Post-hydrogen-loaded draw tower fiber Bragg gratings and their thermal regeneration |
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Authors: | Lindner Eric Canning John Chojetzki Christoph Brückner Sven Becker Martin Rothhardt Manfred Bartelt Hartmut |
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Affiliation: | Institute of Photonic Technology (IPHT), Albert Einstein Street 9, 07745 Jena, Germany. eric.lindner@ipht‐jena.de |
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Abstract: | The idea of Bragg gratings generated during the drawing process of a fiber dates back almost 20 years. The technical improvement of the draw tower grating (DTG) process today results in highly reliable and cost-effective Bragg gratings for versatile application in the optical fiber sensor market. Because of the single-pulse exposure of the fiber, the gratings behave typically like type I gratings with respect to their temperature stability. This means that such gratings only work up to temperatures of about 300?°C. To increase temperature stability, we combined DTG arrays with hydrogen postloading and a thermal regeneration process that enables their use in high-temperature environments. The regenerated draw tower gratings are demonstrated to be suitable for temperatures of more than 800?°C. |
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