Travelling wave type photo amplifier
文献类型：专利
| 作者 | MASUDA SHIGEFUMI |
| 发表日期 | 1988-09-19 |
| 专利号 | JP1988224284A |
| 著作权人 | FUJITSU LTD |
| 国家 | 日本 |
| 文献子类 | 发明申请 |
| 其他题名 | Travelling wave type photo amplifier |
| 英文摘要 | PURPOSE:To increase a necessary light output and reduce the noise level without using an optical isolator, by providing a waveguide layer at the lower part of an active layer of a semiconductor laser with a diffraction grating to give the reflectivity a fluctuation of quater-wavelength period at a center frequency of a light to be amplified in the semiconductor laser. CONSTITUTION:An input end of a semiconductor laser is formed by a creep end 1 or a non-reflecting film 2, and an output end is formed by a non-reflecting film 2. A bias level is so set that a self oscillation does not generate. A waveguide layer 4 at the lower part of an active layer 3 is provided with a diffraction grating 5 to give the reflectivity a fluctuation with a period of a quater of wavelength lambda0, at a center frequency of a light to be amplified in the semiconductor laser. As the period is lambda0/4, a feedback light is canceled in the diffraction grating, and incident light is restrained from reflecting and travelling backward. Accordingly, the unilateral amplification effect is generated, and the output is almost doubled. Thereby, an optical isolator of high cost is not required. Further, as the result of large light output, the noise generation is little and a low noise operation is enabled. |
| 公开日期 | 1988-09-19 |
| 申请日期 | 1987-03-12 |
| 状态 | 失效 |
| 源URL | [http://ir.opt.ac.cn/handle/181661/67814]  |
| 专题 | 半导体激光器专利数据库 |
| 作者单位 | FUJITSU LTD |
| 推荐引用方式 GB/T 7714 | MASUDA SHIGEFUMI. Travelling wave type photo amplifier. JP1988224284A. 1988-09-19. |
入库方式： OAI收割
来源：西安光学精密机械研究所
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