PROCESS FOR PRODUCING OPTICAL FIBER AND ITS PREFOR

专利名称：PROCESS FOR PRODUCING OPTICAL FIBER

AND ITS PREFORM

发明人：NAKANISHI, Tetsuya,HARUNA,

Tetsuya,ISHIKAWA, Shinji

申请号：EP07767342.4申请日：20070621公开号：EP2008977B1公开日：20130925

摘要：The present invention relates to an optical fiber preform fabricating methodthat makes it possible to implement a reduction in iron impurities at a low cost. Theoptical fiber preform fabricating method comprises a glass synthesis step for forming aglass region constituting at least a part of the core area of the optical fiber. The glasssynthesis step includes a deposition step of depositing glass particles containing the Al-element inside the glass pipe by means of chemical vapor deposition, and a consolidationstep of obtaining a transparent glass body from the glass soot body thus obtained. Inother words, the deposition step synthesizes glass particles on the inside wall of a glasspipe by feeding raw material gas, in which the content ratio (O/Al) of the O-element andAl-element is 20 or less, into the glass pipe. Furthermore, the consolidation step obtainsa transparent glass body from the glass soot body by heating the glass soot body. Thetransparent glass body that is formed in the consolidation step constitutes part of thecore region.

申请人：SUMITOMO ELECTRIC INDUSTRIES

地址：JP

国籍：JP

代理机构：HOFFMANN EITLE

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