PROCESS FOR PRODUCING OPTICAL-FIBRE PREFORM, OPTICAL-FIBRE PREFORM AND OPTICAL FIBER ASSOCIATED THEREWITH

摘要

PROBLEM TO BE SOLVED: To provide an optical-fibre preform and a process for producing a final optical-fibre preform obtained by plasma built-up on a primary preform in the field of optical fibres. SOLUTION: The invention relates especially to a final optical-fibre preform comprising a primary preform 3 obtained by a VAD (vapor-phase axial deposition) process or an OVD (outside vapor deposition) process, a silica sleeve tube 4 surrounding the primary preform 3, and a built-up layer 5 made of silica particles surrounding the silica sleeve tube 4. COPYRIGHT: (C)2005,JPO&NCIPI