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Influence of the coating type on the radiation sensitivity of FBGs

Publication date 2008
B-Phot Authors Francis Berghmans
A. I. Gusarov, C. Chojetzki, I. Mckenzie, and F. Berghmans, “Influence of the coating type on the radiation sensitivity of FBGs,” in Proc. SPIE, Photonics Europe 2008, 2008, vol. 7003.
Abstract The ionizing radiation response of fiber Bragg gratings (FBGs) as a function of grating fabrication parameters and fiber characteristics has been investigated in a number of studies. In the present work we analyze a particular aspect of the problem, which was not considered up to now: the influence of the fiber coating on the radiation sensitivity of FBGs. The FBGs used in our study are draw tower gratings written before applying the coating in a fiber with a photosensitive 18 mol.% GeO2-doped core. We irradiated polyimide, acrylate and ormocer coated gratings as well as mechanically stripped ormocer coated FBGs using a Co60 radiation source up to a 40 kGy dose. This total dose level corresponds to a near-Earth space radiation environment mission. We show that the coating type must be taken into account for correctly interpreting ionizing radiation effects on FBGs. Our analysis also shows that a properly designed coating can enhance or decrease the grating radiation sensitivity. Therefore, the results are of interest for both dosymetry and space communication applications of the FBGs.
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