apparatus to determine brydningsindeksprofilen of optical fibres and precursors for optical fibresThe apparatus comprises an opaque screen (8), which is placed between a source and the fibre or preform (7) and has an oblique slit (9) which identifies a plane section of the fibre or preform...
Process for eliminating the axial refractive-index depression in optical fibres, obtained by the MCVD process, consisting in generating a pressure of dopant when in vapour state, equal to the vapour pressure of the dopant itself, inside the preform, during the collapsing state.ROBA CIACOMO...
procedure for the elimination of the axial brydningsindekssaenkning in optical fibresProcess for eliminating the axial refractive-index depression in optical fibres, obtained by the MCVD process, consisting in generating a pressure of dopant when in vapour state, equal to the vapour pressure of ...