Nonlinearity effects of lateral density diffusion coefficient on gain-guided VCSEL performance

Jianzhong Li, Samson H. Cheung, Cun-Zheng Ning

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


Electron and hole diffusions in the plane of semiconductor quantum wells play an important part in the static and dynamic operations of semiconductor lasers. In this paper, we apply a hydrodynamic model developed from the semiconductor Bloch equations to numerically study the effects of nonlinearity in the diffusion coefficient on single mode operation and direct modulation of a gain-guided InGaAs/GaAs multiple quantum well laser, operating not too far from threshold. We found that a small diffusion coefficient is advantageous for lowering the threshold current and increasing the modulation bandwidth. Most importantly, the effects of nonlinearity in the coefficient can be approximately reproduced by replacing the coefficient with an effective constant diffusion coefficient, which corresponds roughly to the half height density of the density distribution. This conclusion is the same as in Ref. 8, but we will discuss the disagreements in reaching it. Finally, the beam profile is slightly modified in the nonlinear case.

Original languageEnglish (US)
Title of host publicationProceedings of SPIE - The International Society for Optical Engineering
EditorsT P Lee, Q Wang
Number of pages8
StatePublished - 2001
Externally publishedYes
EventOptoelectronics, Materials, and Devices for Communications - Beijing, China
Duration: Nov 12 2001Nov 15 2001


OtherOptoelectronics, Materials, and Devices for Communications


  • Inhomogeneity
  • Lateral carrier diffusion
  • Nonlinearity
  • Semiconductor laser

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Condensed Matter Physics


Dive into the research topics of 'Nonlinearity effects of lateral density diffusion coefficient on gain-guided VCSEL performance'. Together they form a unique fingerprint.

Cite this