Title:
PRODUCTION OF PREFORM FOR OPTICAL FIBER
Document Type and Number:
Japanese Patent JPS58125621
Kind Code:
A
Abstract:
PURPOSE: An SiO2 porous parent material containing at least one selected from P2O5, GeO2 and B2O3 is sintered in the presence of a gas containing a phosphorus compound to produce polymode glass fiber with less pulse dispersion over a wide range of wave length.
CONSTITUTION: By the VAD process, an SiO2 porous parent material 1 doped with P2O5 or other substances is deposited on the end of the seed rod 2. Then, the porous parent material 1 is put in the furnace core tube 3 filled with a gas containing a phosphorus compound such as He gas containing POCl3 and sintered by heating with the heater 4 to convert it into a transparent glass (preform) 5.
Inventors:
NAKAHARA MOTOHIRO
WATANABE MINORU
TANAKA SHIGERU
KIYOUDOU TSUNEHISA
WATANABE MINORU
TANAKA SHIGERU
KIYOUDOU TSUNEHISA
Application Number:
JP490582A
Publication Date:
July 26, 1983
Filing Date:
January 18, 1982
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE
SUMITOMO ELECTRIC INDUSTRIES
SUMITOMO ELECTRIC INDUSTRIES
International Classes:
C03B37/018; C03B37/014; G02B6/00; (IPC1-7): C03B20/00; C03B37/00; G02B5/14
Domestic Patent References:
| JPS4999709A | 1974-09-20 |
Attorney, Agent or Firm:
Shiro Mitsuishi