公开(公告)号：JP2002226226A

公开(公告)日：2002-08-14

申请号：JP2002000109

申请日：2002-01-04

Applicant: LUCENT TECHNOLOGIES INC

Inventor： DE HAZAN YORAM ,  MAC CHESNEY JOHN BURNETTE ,  STOCKERT THOMAS EDWARD ,  CHRISTOPHER ALAN WHITE

IPC: G02B6/00 ,  C03B37/014

Abstract: PROBLEM TO BE SOLVED: To provide a new fluorine doping method. SOLUTION: Treating time required for fluorine doping of a porous silica body to produce a fluorine doped preform for producing an optical fiber having lowered refractive index is shortened by the division of a doping step into a preliminary heaping step for heaping 'excess amount' of fluorine on silica particles and a drive-in step for diffusing fluorine atom in the silica particles. As the drive-in step is assembled easily with a sintering step or a consolidating step, doping treatment efficiency is increased furthermore.