公开(公告)号：NO811998L

公开(公告)日：1981-12-17

申请号：NO811998

申请日：1981-06-12

Applicant: CSELT CENTRO STUDI LAB TELECOM

Inventor： MODONE EROS ,  ROBA GUACOMO

IPC: C03B37/00 ,  C03B37/018 ,  C03B37/025 ,  C03C13/00 ,  C03C13/04 ,  C03C21/00 ,  G02B6/00 ,  C03B

Abstract: Process for reducing hydroxyl-group content in preforms for optical fibres, manufactured by MCVD process, consisting of isotopic exchange between hydrogen and deuterium near the internal walls of the silica-glass supporting tube (8). The operation is carried out in two steps, first by inducing deuterium adsorption and then by termally activating the exchange reaction.