Optical design of distributed feedback lasers-on-thin-film-silicon

Vivek Krishnamurthy, Qian Wang, Jing Pu, Ter Hoe Loh, Seng Tiong Ho

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


We design and theoretically evaluate the performance of a novel distributed feedback (DFB) laser-on-thin-film-silicon through its coupling coefficient, threshold current, and slope efficiency. In the DFB laser-on-thin-film-silicon, the optical mode is confined and guided by the narrow III-V-based epi-layers, resulting in an optical field confinement of ∼15\%$. Hence, through the variation of the width of the epi-layers, the optical mode-overlap with the gratings etched on the silicon could be changed. This changes the coupling coefficient of the DFB laser, providing a superior flexibility in reducing the threshold current and increasing the slope efficiency of the laser by ∼ 3× to 4×, in comparison with the previous work on DFB laser-on-silicon.

Original languageEnglish (US)
Article number6497499
Pages (from-to)944-947
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number10
StatePublished - 2013


  • Distributed feedback structure
  • laser
  • silicon evanescent platform
  • silicon photonics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Optical design of distributed feedback lasers-on-thin-film-silicon'. Together they form a unique fingerprint.

Cite this