This review presents the state of the art of the study of germanium-related colour centres in
silica glass and silica-based fibres. Most attention is concentrated on the dominant colour …

UV (248 nm) induced changes in the UV spectrum (165–300 nm) of optical fibre preform
cores have been measured which can account for refractive index changes observed on …

We present data concerning the dynamics of photoexcitation of defect centers in germanium‐
doped silica glass optical fibers and fiber preforms. It is shown that two‐photon absorption of …

γ-radiation-induced loss spectra were measured in a radically new optical fibre with a
refractive index profile shaped by nitrogen-doped silica. The fibre showed unique radiation …

Based on Raman and hyper-Raman scattering experiments and on direct green light
absorption measurements, excitations of a new type—charge transfer excitons—are found to …

In-fiber Bragg and long-period gratings as well as Mach-Zehnder interferometers based on
germanium-and nitrogen-doped silica fibers have been investigated under/spl gamma/-rays …

Bragg gratings have been written within four germanosilicate fibers either by a pulsed or by
a continuous-wave exposure of each fiber to a coherent UV two-beam interference pattern …

The origins of optical absorption induced in germanosilicate-core optical fiber by exposure
to visible, ultraviolet and γ-radiation have been investigated. The effects of exposure to 5.0 …

The energy states of oxygen-deficient type defects in the vacuum ultraviolet region are
discussed based on the experimental results of vacuum ultraviolet absorption, temperature …

Defect centres induced by UV laser excitation in the germanosilicate core of optical fibre
preforms both with and without Ce addition were studied by the optical absorption …