Method for manufacturing optical fiber base materi

专利名称：Method for manufacturing optical fiber base

material, and optical fiber

发明人：Tetsuya Haruna,Masaaki Hirano,Yoshiaki

Tamura

申请号：US14115660申请日：20121228公开号：US09199877B2公开日：20151201

专利附图：

摘要：A method for making a high quality optical fiber preform includes: thermallydefusing the alkali metal element into the inner side of a silica glass pipe by heating the

glass pipe from the outside by a heat source while vapors of alkali metal salt generatedby heating an alkali metal salt is supplied to the inside of the glass pipe from an endthereof; collapsing the glass pipe for forming a core rod; and adding a cladding partaround the circumference of the core rod. At the start of the thermal diffusion, the alkalimetal salt is heated at a temperature for making the vapor pressure of the alkali metalsalt to be 0.1 kPa or less, and thereafter the alkali metal salt is heated up to a

temperature for making the vapor pressure of the alkali metal salt to be larger than 0.1kPa.

申请人：SUMITOMO ELECTRIC INDUSTRIES, LTD.

地址：Osaka-shi, Osaka JP

国籍：JP

代理机构：Drinker Biddle & Reath LLP

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