Behavior of fibre Bragg gratings under high total dose gamma radiation

• Published in: IEEE transactions on nuclear science Vol. 47; no. 3; pp. 688 - 692
• Main Authors: Gusarov, A.I., Berghmans, F., Fernandez, A.F., Deparis, O., Defosse, Y., Starodubov, D., Decreton, M., Megret, P., Bondel, M.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01-06-2000; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Amplitudes; Bragg gratings; Detection; Fiber gratings; Fibers; Fibre; Fibres; Gamma radiation; Gamma rays; Hydrogen; Optical fiber communication; Optical fiber sensors; Optical fibers; Optical reflection; Reflectivity; Temperature sensors
• ISSN: 0018-9499; 1558-1578
• DOI: 10.1109/23.856499

We report on the effect of MGy dose level /spl gamma/-irradiation on the parameters of fibre Bragg gratings intended for sensing applications. The /spl gamma/-radiation sensitivities of gratings written with near-UV 330 nm light in hydrogen loaded Ge-doped fibres and of a grating written in a N-doped fibre were found to be higher than that of gratings written in a 10 mol.% Ge-doped fibre without hydrogen loading. In the former cases, changes in the amplitude and the width of the Bragg peak were observed during /spl gamma/-irradiation while no change was observed in the latter case. For the grating written in the N-doped fibre, the radiation-induced shift of the Bragg peak did not saturate while for gratings written in hydrogen-loaded Ge-doped fibres it saturated to a higher level than for gratings written in unloaded Ge-doped fibre.