Title:
PRODUCTION OF SYNTHETIC QUARTZ PIPE
Document Type and Number:
Japanese Patent JPH01103922
Kind Code:
A
Abstract:
PURPOSE: To obtain a synthetic quartz pipe giving an optical fiber having superior H2 and radiation resistances by depositing porous glass on a hollow mandrel made of a porous material, feeding a specified doping gas to the inside of the mandrel and vitrifying the porous glass.
CONSTITUTION: Porous glass of pure quartz, etc., is deposited on a hollow mandrel made of a porous material by VAD or other method. A doping gas contg. GeCl4 and O2 is fed to the inside of the mandrel and the porous glass is vitrified by sintering in a red-hot state at such a high temp. as 1,600°C in an atmosphere of gaseous He, etc. The porous glass is uniformly doped with GeO2 during the vitrification and the mandrel is pulled out after the vitrification.
Inventors:
URANO AKIRA
Application Number:
JP25963987A
Publication Date:
April 21, 1989
Filing Date:
October 16, 1987
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES
International Classes:
G02B6/00; C03B8/04; C03B37/014; (IPC1-7): C03B8/00; C03B37/014; G02B6/00
Attorney, Agent or Firm:
Akira Uchida (3 outside)