Gain and phase dynamics of InAs/GaAs quantum dot semiconductor optical amplifiers

T. Piwonski, I. O'Driscoll, J. Houlihan, G. Huyet, R. J. Manning, B. Corbett

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Citations (Scopus)

Abstract

Ultrafast spectroscopy of quantum dot semiconductor optical amplifiers (SOAs) provides valuable information about the potential of these devices for emerging applications such as multi-wavelength regeneration while giving insight on their unique carrier dynamics. Pump-probe spectroscopy was used to analyse the carrier dynamics in InAs/GaAs quantum dot amplifiers. We have developed a "two-colour" experimental configuration that allows us to pump and probe different parts of the Amplified Spontaneous Emission spectrum and develop a detailed picture of the relevant carrier processes in both absorption and gain regimes of QD-SOAs. The study has revealed that hole recovery and intradot electron relaxation occur on a picosecond timescale, while the electron capture time is on the order of 10 ps. The relaxation of the wetting layer carrier density was shown to have a strong effect on the phase dynamics of both ground and excited state transients, while having a much weaker effect on the gain dynamics. Such behaviour is strongly encouraging for reduced pattern effect operation in high speed optical networks.

Original languageEnglish
Title of host publicationProceedings of 2008 10th Anniversary International Conference on Transparent Optical Networks, ICTON
Pages145-148
Number of pages4
DOIs
Publication statusPublished - 2008
Event2008 10th Anniversary International Conference on Transparent Optical Networks, ICTON - Athens, Greece
Duration: 22 Jun 200826 Jun 2008

Publication series

NameProceedings of 2008 10th Anniversary International Conference on Transparent Optical Networks, ICTON
Volume2

Conference

Conference2008 10th Anniversary International Conference on Transparent Optical Networks, ICTON
Country/TerritoryGreece
CityAthens
Period22/06/200826/06/2008

Keywords

  • Gain and phase dynamics
  • Pump-probe spectroscopy
  • Quantum dot
  • Semiconductor optical amplifier

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