Abstract
A germanosilicate fibre (7 mol.% GeO/sub 2/) codoped with nitrogen has been fabricated by the surface plasma CVD process. The fibre has demonstrated a photoinduced refractive index change of 2/spl times/10/sup -3/ at an irradiation dose of 75 kJ/cm/sup 2/ and a wavelength of 244 nm without hydrogen loading, and an index change of 1/spl times/10/sup -2/ after hydrogen loading.
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