Title:
光ファイバ多孔質母材の製造方法
Document Type and Number:
Japanese Patent JP4762408
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a method for producing a porous preform for an optical fiber by which the cracking of the porous preform can be prevented. SOLUTION: When the temperatures of faces of flames from a burner for forming a first layer and a burner for forming a second layer kept in contact with a region in which a porous preform 6 for an optical fiber grows are controlled, in the case where coordinates are given in the growing direction of the porous preform 6, a point corresponding to the interference part of the flames is represented by a point H, the front edge of the first layer of the porous preform 6 is represented by a point A and a point corresponding to 1/3 of the distance from the point A to the point H is represented by a point P, the growing state of the porous preform 6 is controlled in such a way that the relation of -60<=(T1-T2)<=20 is established between the maximum temperature T1( deg.C) of the P-A region between the points P and A and the maximum temperature T2( deg.C) of the P-H region between the points P and H.
Inventors:
Hisashi Koaizawa
Kiyoshi Arima
Cheap
Tsuneo Suzuki
Tadashi Takahashi
Kiyoshi Arima
Cheap
Tsuneo Suzuki
Tadashi Takahashi
Application Number:
JP2000309093A
Publication Date:
August 31, 2011
Filing Date:
October 10, 2000
Export Citation:
Assignee:
THE FURUKAW ELECTRIC CO.,LTD.
International Classes:
C03B37/018; G02B6/00; C03B37/014; G02B6/032
Domestic Patent References:
| JP10053429A | ||||
| JP62162640A | ||||
| JP62162641A | ||||
| JP59217638A | ||||
| JP60041538A |
Attorney, Agent or Firm:
Hidetoshi Matsumoto