Development of high-gain, polarization-insensitive closely-stacked quantum dot optical amplifiers

2014 Fiscal Year Final Research Report

• Project/Area Number: 24360121
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Electronic materials/Electric materials
• Research Institution: Kobe University
• Principal Investigator: KITA Takashi 神戸大学, 工学(系)研究科(研究院), 教授 (10221186)
• Co-Investigator(Kenkyū-buntansha): HARADA Yukihiro 神戸大学, 大学院工学研究科, 助教 (10554355)
• Project Period (FY): 2012-04-01 – 2015-03-31
• Keywords: 量子ドット / 光アンプ / 光利得 / 偏波無依存

Outline of Final Research Achievements

We performed modal analysis for 40-stacked InAs/GaAs quantum dot semiconductor optical amplifiers (QDSOAs) as a function of the waveguide width using an equivalent refractive index technique. QDSOAs with 5- and 11-micro-m-waveguide widths show multi-mode operations. The theoretical simulation reproduced well the experimental electroluminescence spectrum and unveiled that the output signals comprise several transverse modes. Besides, we confirmed a waveguide width less than 1.28 micro-m is essential to realize single-mode QDSOAs. The modal gain spectra were analyzed by using the Hakki-Paoli method. Multi peaks arisen from the multi-mode operation were also observed in the gain spectrum, suggesting precise control of the transverse mode is important for a practical realization of the single-mode device.

Free Research Field

半導体電子工学