Optical fiber gain medium with wavelength selective core filter
文献类型：专利
| 作者 | GRUBB, STEPHEN G.; ZANONI, RAYMOND; WAARTS, ROBERT G.; ARCHAMBAULT, JEAN-LUC |
| 发表日期 | 2001-01-30 |
| 专利号 | US6181465 |
| 著作权人 | SDL, INC. |
| 国家 | 美国 |
| 文献子类 | 授权发明 |
| 其他题名 | Optical fiber gain medium with wavelength selective core filter |
| 英文摘要 | An optical fiber used as the active amplifying medium in a fiber laser is arranged to have a high insertion loss at an undesired frequency, while retaining a low insertion loss at a desired lasing frequency. In one embodiment, loss at a Raman-shifted frequency is introduced by using an optical fiber which has multiple claddings with an index profile that includes an elevated index region located away from the core, but within the evanescent coupling region of the core. A distributed loss, which can be enhanced by bending, is produced at the Raman frequency which effectively raises the threshold at which Raman scattering occurs in the fiber and therefore results in a frequency-selective fiber. In another embodiment, an absorbing layer is placed around the core region. The absorbing layer is chosen to have a sharp absorption edge so that it absorbs highly at the Raman-shifted wavelength, but minimally at the desired lasing wavelength. In still another embodiment, the optical fiber is constructed with a core with long period gratings formed therein. The gratings are fabricated with a periodicity selected to provide a relatively high insertion loss at the Raman frequency while simultaneously providing a relatively low insertion loss at the lasing frequency. In accordance with yet another embodiment, a bend loss technique is used to suppress amplified spontaneous emission at an unwanted wavelength due to a competing atomic energy level system in a fiber laser. |
| 公开日期 | 2001-01-30 |
| 申请日期 | 1999-04-05 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/36564]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | SDL, INC. |
| 推荐引用方式 GB/T 7714 | GRUBB, STEPHEN G.,ZANONI, RAYMOND,WAARTS, ROBERT G.,et al. Optical fiber gain medium with wavelength selective core filter. US6181465. 2001-01-30. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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