Visible-region absorption and fluorescence are first observed for GeO2-doped silica optical
fibres propagated by UV light in the 350? 370 nm region. An absorption band at 1.97 eV and …

Heating standard telecommunication Ge-doped silica fibres to 1200 degrees C removes the
ultraviolet absorption bands believed to be responsible for photosensitivity. Losses at 480 …

The spatial distribution of the 240 nm absorption and its associated luminescence measured
in a Ge-doped silica optical fibre preform are presented. The 400 nm luminescence was …

A fluorescence at 657.7 nm observed for heat-treated optical fibres in a hydrogen
atmosphere is reported. The fluorescence intensity is related to the short wavelength loss …

The spatial distribution of the blue luminescence associated with the 240 nm absorption
band, measured in Ge-doped optical fibre preforms using a wide range of 266 nm excitation …

Two very narrow absorption bands positioned at 765 nm and at 1273 nm have been found
in pure silica and fluorinedoped silica optical fibres. Their origin is probably connected with …

The refractive index change arising following the UV exposure of a Ge-doped fiber was
obtained by measuring the change in the far-field width of the fiber mode in the infrared …

Germanium ions have been implanted in fused silica using ion beams having energies of 3
and 5 MeV and doses ranging from 1 X lOI to 5 X 1014 ions/cm'. For wavelengths shorter …

Spectral loss characteristics of GeO2-P2O5-doped silica graded-index fibres in long-wavelength
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Recent developments in the photosensitivity of germania doped silica glass are reviewed.
The cause and nature of the absorption band centered near 240 nm are discussed and …