Method for producing glass preform for optical fiber
AssigneesSumitomo Electric Industries, Ltd., Nippon Telegraph and Telephone Corporation
InventorsMichihisa Kyoto, Minoru Watanabe, Shigeru Tanaka, Motohiro Nakahara
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Abstract
A method for producing a glass preform for an optical fiber comprising forming a fine glass particle mass by flame hydrolysis of a glass raw material, dehydrating the fine glass particle mass in an oxygen atmosphere containing chlorine or a chlorine-containing compound at such temperature that the soot preform is not considerably shrunk and heating the soot preform at a temperature at which the soot preform is sintered and made transparent, the glass preform produced by which method contains less hydroxyl groups, structural defects and an optical fiber fabricated from said glass preform has stable light transmission characteristics for a long time.
Claims5
A method for producing a glass preform for an optical fiber comprising:
- forming a fine glass particle mass by flame hydrolysis of a glass raw material,
- dehydrating the fine glass particle mass in an atmosphere including essentially only oxygen and 1 to 20% by mole chlorine or a chlorine containing compound at such temperature that the perform is not considerably shrunk, and
- heating the preform at a temperature at which the preform is sintered and made transparent.
Dependencies are inferred from the claim text.