| 申请日期 | 2025-08-21 | 申请号 | EP20172678 |
| 公开（公告）号 | EP3736921B1 | 公开（公告）日 | 2022-03-16 |
| 公开国别 | EP | 申请人省市代码 | 全国 |
| 申请人 | TOYOTA JIDOSHA KABUSHIKI KAISHA; Toyota School Foundation | ||
| 简介 | A first fiber (30) is connected to a first end of a third fiber (50) doped with a rare earth element, and a second fiber (80) is connected to a second end of the third fiber (50). In the third fiber (50) doped with the rare earth element, a central portion of a core (54) is more heavily doped with the rare earth element than a peripheral portion of the core (54) is. | ||
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