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文献类型：专利
| 作者 | AKIBA SHIGEYUKI; UKO KATSUYUKI; SAKAI KAZUO; MATSUSHIMA JUICHI |
| 发表日期 | 1989-08-09 |
| 专利号 | JP1989037872B2 |
| 著作权人 | KOKUSAI DENSHIN DENWA CO LTD |
| 国家 | 日本 |
| 文献子类 | 授权发明 |
| 其他题名 | - |
| 英文摘要 | PURPOSE:To differ the strength of Bragg reflection between first and second subregions of a light-emitting region of a DFB laser so as to cause the DFB laser to produce asymmetrical light outputs from the ends, by differing the length of cyclicly recessed and projected surfaces between the first and second subregions or differing the depths of the recesses and projections therebetween. CONSTITUTION:A waveguide layer 2 is provided with a cyclicly recessed and projected surface 8 (diffraction grating) which is divided into first and second sub-regions having different lengths (different numbers of recesses and projections). For example, the phase shifting point is positioned on the right-hand side from the center so that the first sub- region of the diffraction grating is longer than the second subregion. Accordingly, Bragg reflection is stronger in the first subregion having a longer diffraction grating, while on the contrary the laser output is larger in the second sub-region where the Bragg reflection is weaker. When the laser oscillating power corresponds exactly to the Bragg wavelength, that is, in the case of a primary diffraction grating, the phase shift DFB laser output is produced with a wavelength equal to twice the cycle of the recesses and projections, and the output distribution is determined by the strength of the Bragg reflection in the first and second regions. |
| 公开日期 | 1989-08-09 |
| 申请日期 | 1984-08-15 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/79045]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | KOKUSAI DENSHIN DENWA CO LTD |
| 推荐引用方式 GB/T 7714 | AKIBA SHIGEYUKI,UKO KATSUYUKI,SAKAI KAZUO,et al. -. JP1989037872B2. 1989-08-09. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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