公开(公告)号：EP1251107A1

公开(公告)日：2002-10-23

申请号：EP02251803.9

申请日：2002-03-13

Applicant: LUCENT TECHNOLOGIES INC.

Inventor： de Hazan, Yoram ,  MacChesney, John B. ,  Monberg, Eric M. ,  Stockert, Thomas E.

IPC: C03B37/014

CPC classification number: C03B37/01446 ,  C03B2201/12 ,  C03B2201/31 ,  C03B2203/22

Abstract: The doped silica core region of a core rod for an optical fiber preform is protected against unwanted fluorine doping during fluorine doping of the outer silica layer by selectively consolidating the core region prior to fluorine doping. Due to dopants in the core region, the soot in the core region consolidates before the soot in the outer undoped region. This inherent property allows the entire core rod to be heated prior to fluorine doping resulting in selective partial consolidation and preventing fluorine doping of the doped center core region. The process time required may be reduced by using incremental fluorine doping. In the incremental doping process the doping step is separated into a deposit step, where "excess" fluorine is deposited on the silica particles, and a drive-in step where atomic fluorine is distributed into the silica particles. The drive-in step is conveniently combined with the sintering or consolidation step to further enhance the efficiency of the doping process.

Abstract translation: 用于光纤预制棒的芯棒的掺杂二氧化硅芯区域通过在氟掺杂之前选择性地固结芯区域来保护外氟化硅层的氟掺杂期间的不需要的氟掺杂。 由于核心区域中的掺杂剂，核心区域中的烟灰在外部未掺杂区域之前的烟灰之前固结。 这种固有性质允许在氟掺杂之前将整个芯棒加热，从而导致选择性部分固结并防止掺杂中心芯区域的氟掺杂。 可以通过使用增量氟掺杂来减少所需的处理时间。 在增量掺杂过程中，掺杂步骤被分离成沉积步骤，其中“过量”氟沉积在二氧化硅颗粒上，以及将原子氟分布到二氧化硅颗粒中的驱入步骤。 驱入步骤方便地与烧结或固化步骤组合以进一步提高掺杂过程的效率。