Mode change detecting device
文献类型：专利
| 作者 | ASAKURA HIROYUKI; HAGIWARA KIYOKAZU; NISHIOKA MINORU; IIDA MASANORI |
| 发表日期 | 1989-05-31 |
| 专利号 | JP1989138436A |
| 著作权人 | MATSUSHITA ELECTRIC IND CO LTD |
| 国家 | 日本 |
| 文献子类 | 发明申请 |
| 其他题名 | Mode change detecting device |
| 英文摘要 | PURPOSE:To make a device small in size and simple and to eliminate the influence of the intensity variation of a light source by providing an optical isolator and converting a mode change into intensity variation through a multi-mode fiber, etc. CONSTITUTION:Light 19 emitted by a semiconductor laser element 1 is made incident on the optical isolator 2. The incident light is coupled with the multi- mode fiber 3 and propagated in the optical fiber in multimode and modes of high order are removed by a mode scrambler 4 to select several basic modes. Then, branch output of an optical branching device 5 is detected by a photodetector 6. If the wavelength of the semiconductor laser 1 varies, a propagation mode excited in the multi-mode fiber 3 changes, the branching ratio of the optical branching device 5 varies, and the light intensity detected by photodetectors 6 and 11 varies. Further, a comparator 12 calculates the ratio of the two outputs to remove the intensity variation of the light source, so that only the mode change is detected. |
| 公开日期 | 1989-05-31 |
| 申请日期 | 1987-11-25 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/63121]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | MATSUSHITA ELECTRIC IND CO LTD |
| 推荐引用方式 GB/T 7714 | ASAKURA HIROYUKI,HAGIWARA KIYOKAZU,NISHIOKA MINORU,et al. Mode change detecting device. JP1989138436A. 1989-05-31. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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