| 申请日期 | 2025-08-19 | 申请号 | KR1019990059404 |
| 公开（公告）号 | KR100581622B1 | 公开（公告）日 | 2006-05-12 |
| 公开国别 | KR | 申请人省市代码 | 全国 |
| 申请人 | KT CORPORATION; KT Corporation | ||
| 简介 | A rare earth-doped optical fiber comprises a cladding, a center core doped with a rare earth element, the center core having a refractive index higher than that of the cladding, and a ring-shaped core surrounding the center core without contact and having a refractive index higher than that of the cladding and lower than that of the center core. | ||
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