Research of a hig-performance dynamic-single-mode laser

高性能动态单模激光器的研究

• 批准号: 60850060
• 负责人: SUEMATSU Yasuharu
• 金额: $ 11.78万
• 依托单位: Tokyo Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Developmental Scientific Research
• 财政年份: 1985
• 资助国家: 日本
• 起止时间: 1985 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-60850060/
• 关键词: dynamic-single-mode (DSM) laser; distributed-Bragg-reflector (DBR) laser; bundleintegrated-quide (BIG); integrated laser; semiconductor laser; optical integrated circuit; direct modulation; side-mode sppression ratio; 発振線幅; 分布反射型レーザ; 集積レーザ; BIG

The main purpose of this research is to realize high-performance dhnamicsingle-mode (DSM) lasers with distributed Bragg reflectors (DBR) by clarifying the dynamic propertis under a high-speed direct modulation both theoretically and experimentally. In order to achieve this purpose, we invented a new waveguide coupling structure called Bundle-Integrated-Guide (BIG), which enables us to attain very high coupling efficiency between the active and the passive waveguide regions in DBR laser and also high reproducibility in its fabrication process. Specific results obtained in this research are summatized as follow.We theoretially pointed out that superior lasing properties, such as a lower threshold current, a higher side-mode suppression ratio, and a wider temperature range for a fixed-single-mode operation, would be obrained by shortening the active region length of DBR-DSM lasers and we also proved that experimentally from the lasing properties of BIG-DBR-DSM lasers.We measured the spect … More ral behaviour of the BIG-DBR-DSM laser under a highspeed direct modulation, such as wavelength chitping and the side-mode-suppression ratio during the modulation period, and clarified these dyanmic properties in terms of 2-mode rate equations.Spectral linewidht of DBR laser and its dependence on the cavity structure was theoretically analized and the result was found to be in good agreement with experimental results obtained for BIG-DBR-DSM lasers. Quite a narrow linewidht of 6.5MHz was obtained at the bias level of 2.2 times the thershold.To improve the reproducibility of BIG-DBR lasers ans to obtain higher lasing performances, a new fabrication process using an island-type pattern etching ans selective regowth was proposed and much improvement was obtained such as high output power of 12.4mW and high side-mode suppression ratio larger than 38dB. Moreover, a novel distributed reflector (DR) laser was proposed to achieve lower threshold current and higher output power operation, and was realized with superior single-mode operation properties. Less

本论文的主要目的是通过理论和实验研究，阐明高速直接调制下的动态特性，实现高性能的分布式布拉格反射器（DBR）动态单模（DSM）激光器。为了实现这一目标，我们发明了一种新的波导耦合结构，称为束集成波导（BIG），这使我们能够获得非常高的耦合效率之间的有源和无源波导区的DBR激光器，也在其制造过程中的高再现性。具体研究结果如下：从理论上指出，具有较低的阈值电流、较高的边模抑制比和较宽的固定单模工作温度范围等优良的激光特性，通过缩短DBR-DSM激光器的有源区长度可以得到BIG-DBR-DSM激光器的最大功率密度，并从BIG-DBR-DSM激光器的激光特性实验上证明了BIG-DBR-DSM激光器的最大功率密度。DSM激光器我们测量了 ...更多信息 研究了BIG-DBR-DSM激光器在高速直接调制下的基本特性，如调制周期内的波长突变和边模抑制比，从理论上分析了DBR激光器的谱线宽度及其与腔结构的关系，所得结果与BIG-DBR-DSM激光器的实验结果符合得很好。为了提高BIG-DBR激光器的重复性和获得更高的激射性能，提出了一种采用岛型图形刻蚀和选择性再生长的新工艺，获得了12.4mW的高输出功率和大于38dB的高边模抑制比。此外，提出了一种新型的分布式反射镜（DR）激光器，以实现低阈值电流和高输出功率的操作，并实现了具有上级单模操作特性。少

项目成果

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Y.Tohmori: Electron.Lett.21. 743-745 (1985)

Y.Tohmori：Electron.Lett.21。

K.Komori: Trans.IECE of Japan. E68. 742-744 (1985)

K.Komori：日本 Trans.IECE。

Y.Tohmori: IOOC/ECOC'5,Technical Diqest. 1. 91-94 (1985)

Y.Tohmori：IOOC/ECOC5，技术摘要。

Y. Tohmori: "Wavelength Stabilization of 1.5<micrn>m GaInAsP/InP Bundle-Intergrated-Guide Distributed-Bragg-Reflector (BIG-DBR) Lasers Integrated with Wavelength Tuning Region" Electron. Lett.22. 138-140 (1986)

Y. Tohori：“与波长调谐区域集成的 1.5 微米 GaInAsP/InP 束集成引导分布式布拉格反射器 (BIG-DBR) 激光器的波长稳定性”电子。