发明名称 |
METHOD FOR MANUFACTURING OPTICAL FIBER BASE MATERIAL, AND OPTICAL FIBER |
摘要 |
A method for making a high quality optical fiber preform includes: thermally defusing 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 generated by heating an alkali metal salt is supplied to the inside of the glass pipe from an end thereof; collapsing the glass pipe for forming a core rod; and adding a cladding part around the circumference of the core rod. At the start of the thermal diffusion, the alkali metal salt is heated at a temperature for making the vapor pressure of the alkali metal salt 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 0.1 kPa. |
申请公布号 |
US2014127507(A1) |
申请公布日期 |
2014.05.08 |
申请号 |
US201214115660 |
申请日期 |
2012.12.28 |
申请人 |
SUMITOMO ELECTRIC INDUSTRIES, LTD. |
发明人 |
HARUNA TETSUYA;HIRANO MASAAKI;TAMURA YOSHIAKI |
分类号 |
C03C25/60;C03C25/10;G02B6/02 |
主分类号 |
C03C25/60 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|