Intrinsic dynamics of quantum-dash lasers

Cheng Chen, Yang Wang, Hery Susanto Djie, Boon S. Ooi, Luke F. Lester, Thomas L. Koch, James C.M. Hwang

Research output: Contribution to journalArticlepeer-review

8 Scopus citations


Temperature-dependent intrinsic modulation response of InAs/InAlGaAs quantum-dash lasers was investigated by using pulse optical injection modulation to minimize the effects of parasitics and self-heating. Compared to typical quantum-well lasers, the quantum-dash lasers were found to have comparable differential gain but approximately twice the gain compression factor, probably due to carrier heating by free-carrier absorption, as opposed to stimulated transition. Therefore, the narrower modulation bandwidth of the quantum-dash lasers than that of quantum-well lasers was attributed to their higher gain compression factor. In addition, as expected, quantum-dash lasers with relatively long and uniform dashes exhibit higher temperature stability than quantum-well lasers. However, the lasers with relatively short and nonuniform dashes exhibit stronger temperature dependence, probably due to their higher surface-to-volume ratio and nonuniform dash sizes.

Original languageEnglish (US)
Article number9
Pages (from-to)1167-1174
Number of pages8
JournalIEEE Journal on Selected Topics in Quantum Electronics
Issue number5
StatePublished - 2011


  • Differential gain
  • microwave modulation
  • optical modulation
  • quantum wells
  • quantum wires
  • semiconductor lasers

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Intrinsic dynamics of quantum-dash lasers'. Together they form a unique fingerprint.

Cite this