In this paper, the thermal degradation mechanism of ultraviolet-induced fiber Bragg gratings (FBGs) written in silica fiber doped with germanium has been developed. The thermal degradation up to 840 oC has been repeatedly examined, and their reflectivity and Bragg wavelength change have been carefully observed. In addition, the temperature characteristic of the FBG is tested by putting it into a silica tube furnace heated from room temperature to 600 oC. The experiment results obtained has shown that the FBGs' thermal behavior is similar to a spring's. Therefore, a novel viewpoint, atomic elastic model applied to explain the thermal degradation mechanism of FBGs, is firstly present. The work is closely related to the use of FBGs for application in temperature sensor field, and the work is also related to form mechanism of FBGs.

Date Published: 24 January 2008
PDF: 4 pages
Proc. SPIE 6829, Advanced Materials and Devices for Sensing and Imaging III, 682919 (24 January 2008);

Published in SPIE Proceedings Vol. 6829:
Advanced Materials and Devices for Sensing and Imaging III
Anbo Wang; Yimo Zhang; Yukihiro Ishii, Editor(s)