发明名称 |
Optical fiber preform producing method, optical fiber production method, and optical fiber |
摘要 |
An optical fiber preform comprises a central core portion having a maximal value Nc of refractive index in the center, and outside the central core portion, comprising at least a depressed portion having a minimal value Nd of refractive index, a ring portion having a maximal value Nr of refractive index and an outside cladding layer having a maximal value No of refractive index. The optical fiber preform satisfies a relation of Nc>=Nr>No>Nd among the values of refractive index. A method of the optical fiber preform comprises fabricating a glass rod by inserting a rod containing at least the central core portion into a pipe containing at least the depressed portion and integrating them, fabricating a glass pipe having the ring portion, and fabricating a vitreous body by integrating the glass rod and the glass pipe by collapsing after inserting the glass rod into the glass pipe.
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申请公布号 |
US7068901(B2) |
申请公布日期 |
2006.06.27 |
申请号 |
US20040494278 |
申请日期 |
2004.04.30 |
申请人 |
SUMITOMO ELECTRIC INDUSTRIES, LTD. |
发明人 |
HIRANO MASAAKI;YANADA EIJI;YOKOKAWA TOMOYUKI;SASAKI TAKASHI |
分类号 |
C03B37/012;G02B6/036 |
主分类号 |
C03B37/012 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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