METHOD OF MANUFACTURING PREFORMS FOR OPTICAL FIBRES HAVING LOW ATTENUATION LOSS
摘要
A method of manufacturing a glass core preform for an optical fibre comprising: providing a porous soot core preform having an outer surface and a central hole extending axially therethrough; dehydrating the porous soot core preform at a first temperature by exposing the outer surface of the preform to an atmosphere containing chlorine, and simultaneously consolidating the soot core preform and closing the central hole at a second temperature higher than the first temperature to form a glass core preform, wherein consolidating and closing comprises sequentially alternating flowing chlorine containing gas into the central hole and reducing the internal pressure of the central hole.
申请公布号
WO2016198125(A1)
申请公布日期
2016.12.15
申请号
WO2015EP63232
申请日期
2015.06.12
申请人
PRYSMIAN S.P.A.
发明人
COCCHINI, Franco;ADIGRAT, Antonio;CARONNA, Valeria;CAIATA, Marco, Antonio;COLLARO, Antonio;SCHIAFFO, Antonio