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23 April 2010Regenerated fiber Bragg gratings in non-hydrogen-loaded photosensitive fibers for high-temperature sensor networks
We report about a thermal regeneration of fiber Bragg gratings written in photosensitive fibers without hydrogen loading
and with the use of UV nanosecond laser pulses. We observe a complex regenerative process which indicates a
secondary grating growth in an optical fiber by thermal activation. This process leads to an increased temperature
stability of the gratings up to 600 °C which differs from the commonly known Type I gratings. With the use of an
interferometric writing technique it is possible to generate arrays of regenerated fiber Bragg gratings (RFBGs) for sensor
networks. The writing conditions of such new type of gratings are investigated and the temperature behavior of these
RFBGs is analyzed. This type of gratings is suitable for high temperature sensor networks by combining the attributes of
good spectral shape and high reflectivity with high temperature stability showing no drift or hysteresis.
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E. Lindner, C. Chojetzki, M. Becker, S. Brückner, M. Rothhardt, H. Bartelt, "Regenerated fiber Bragg gratings in non-hydrogen-loaded photosensitive fibers for high-temperature sensor networks," Proc. SPIE 7677, Fiber Optic Sensors and Applications VII, 76770H (23 April 2010);