Simple model for DFB laser integrated with Mach-Zehnder modulator

L. Y. Du, Siu Fung Yu, N. Q. Ngo

Research output: Journal article publicationConference articleAcademic researchpeer-review


This paper presents a time-domain traveling-wave algorithm for the modeling of the large signal dynamic response of a distributed feedback laser integrated with a Mach-Zehnder modulator. The influence of residual optical feedback from the output of the modulator facet on the dynamic frequency chirp is studied. It is found that the difference in frequency chirp between the turn-on and -off states (i.e., adiabatic chirp) of a π/2 shifted 2 × 2 Mach-Zehnder modulator is minimal and is independent of the residual optical feedback. In addition, it can be shown that the presence of chirped frequency spikes (i.e., transient chirp), due to the change in refractive index as a result of the rapid variation of the bias voltage, can broaden the linewidth and distort the spectrum of the modulated optical signal.
Original languageEnglish
Pages (from-to)243-254
Number of pages12
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 1 Jan 2002
Externally publishedYes
EventMaterials and Devices for optical and Wireless Communications - Shanghai, China
Duration: 15 Oct 200218 Oct 2002


  • Distributed feedback lasers
  • Frequency chirp
  • Large signal modulation
  • Mach-Zehnder modulators
  • Monolithic integration
  • Numerical simulation
  • Optical feedback

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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