SINTERING METHOD OF PARENT GLASS MATERIAL FOR OPTICAL FIBER

Japanese Patent JPS616144

A

PURPOSE: To obtain the titled parent glass material contg. extremely small amt. of impurities, remaining water vapor foams, ununiformity of boundary surface, and chemical defects, etc. in the process for prepg. glass fiber for light transmission by sintering aggregates of fine glass particles by using a specified two stage heating process.

CONSTITUTION: Fine glass particles formed by flame hydrolysis are deposited on a revolving glass rod to obtain a desired refractive index distribution forming thus an aggregated body of fine glass particles (circular cylindrical porous parent material for optical fiber). Then, the aggregate of fine glass particles is dehydrated by the primary heating treatment at a temp. range within ca. 950W 1,250°C causing no severe contraction of the fine particles aggregate in an O2 atmosphere contg. chlorine or a chlorine compd. such as CCl4, SOCl2. The material is then heated upto a vitrifying temp., in He atmosphere (pref. contg. ≤ca. 50mol% O2), and sintering is executed by maintaining the temp.

JPS6466071	METHOD FOR SPLICING OPTICAL WAVE GUIDS
JP2780795	INDUSTRIAL APPLICABILITY: A method for changing the optical structure of an optical fiber and a changed optical fiber.
JPS5734505	FLEXIBLE OPTICAL FIBER CONDUIT AND METHOD OF PRODUCING SAME

KIYOUDOU TSUNEHISA
WATANABE MINORU
TANAKA SHIGERU
NAKAHARA MOTOHIRO

JP12378384A

January 11, 1986

June 18, 1984

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SUMITOMO ELECTRIC INDUSTRIES
NIPPON TELEGRAPH & TELEPHONE

C03B37/14; C03B8/04; C03B19/14; C03B20/00; C03B37/014; G02B6/00; (IPC1-7): C03B20/00; C03B37/014; G02B6/00

JPS54103058A	1979-08-14
JPS5717433A	1982-01-29

Akira Uchida

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