Title:
PRODUCTION OF BASE MATERIAL FOR GI TYPE OPTICAL FIBER AND PREFORM FOR GI TYPE OPTICAL FIBER THUS PRODUCED
Document Type and Number:
Japanese Patent JP3825204
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for reliably producing a base material for a GI type optical fiber having a GI type profile.
SOLUTION: The base material for a GI type optical fiber is produced by subjecting a porous glass base material to at least heat treatment for shrinkage and then subjecting the heat-treated porous glass base material to heat treatment for sintering in an atmosphere containing fluorine. The heat treatment for shrinkage is carried out at a fixed temperature of 1,150 to 1,210°C, preferably with ±5°C accuracy. The heat treatment for sintering is carried out at a fixed speed of 5 to 10 mm/min at the time when the porous glass base material passes through a heating source which its speed is pref. controlled to ±0.5 mm/min accuracy.
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Inventors:
Atsushi Abe
Masaaki Ejima
Shinji Makikawa
Masaaki Ejima
Shinji Makikawa
Application Number:
JP19299799A
Publication Date:
September 27, 2006
Filing Date:
July 07, 1999
Export Citation:
Assignee:
Shin-Etsu Chemical Co., Ltd.
International Classes:
C03B37/014; G02B6/00; G02B6/028; (IPC1-7): C03B37/014; G02B6/00; G02B6/18
Domestic Patent References:
| JP62230638A | ||||
| JP6140831A | ||||
| JP61191528A |
Attorney, Agent or Firm:
Mikio Yoshimiya