Title :
248 nm induced vacuum UV spectral changes in optical fibre preform cores: support for a colour centre model of photosensitivity
Author :
Atkins, R.M. ; Mizrahi, V. ; Erdogan, T.
Author_Institution :
AT&T Bell Labs., Murray Hill, NJ, USA
Abstract :
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 writing Bragg gratings in optical fibres. The changes are thermally reversed at 900 degrees C. A fibre grating has been thermally erased and rewritten with no significant change in fibre photosensitivity.
Keywords :
colour centres; diffraction gratings; optical fibres; photorefractive effect; refractive index; ultraviolet spectra of inorganic solids; 165 to 300 nm; 248 nm; 900 degC; Bragg gratings; UV spectrum; colour centre model; fibre grating; optical fibre preform cores; phase gratings; photosensitivity; refractive index changes; thermal erasure; vacuum UV spectral changes;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19930259
