Abstract
The effect of grating fabrication on radiation sensitivity of the fiber Bragg grating has been investigated experimentally. The FBGs were fabricated in different processes and GeO2 concentrations. H2-loading was applied to change the radiation sensitivity of the FBGs. The FBGs were fabricated in photosensitivity fiber and coupling single mode fiber with GeO2 concentrations in a range from 6 to 23mol%. The temperature sensitivity coefficient variation during radiation was studied and temperature-induced Bragg wavelength shift was compensated. 3 types mathematic model were used for fitting curve of radiation-induced Bragg wavelength shift. The lowest Bragg wavelength shift (about 13pm after a total dose of 50kGy) was obtained by a grating written in photosensitive optical fiber PSF-GeB-125 with 20.2mol% GeO2 concentration and without H2-loading treatment.
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