Simple model for a distributed feedback laser integrated with a Mach-Zehnder modulator

Siu Fung Yu, N. Q. Ngo

Research output: Journal article publicationJournal articleAcademic researchpeer-review

13 Citations (Scopus)


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 (MZ) 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 MZ 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. Furthermore, the possibility of doubling the modulation frequency of MZ modulators using a dual-arm dual-signal modulation format is investigated.
Original languageEnglish
Pages (from-to)1062-1074
Number of pages13
JournalIEEE Journal of Quantum Electronics
Issue number8
Publication statusPublished - 1 Aug 2002
Externally publishedYes


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

ASJC Scopus subject areas

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


Dive into the research topics of 'Simple model for a distributed feedback laser integrated with a Mach-Zehnder modulator'. Together they form a unique fingerprint.

Cite this