Polarisation dependent optical modulation using the plasma effect in a GaAs-GaAlAs quantum well waveguide

H. K. Tsang, I. H. White

Research output: Contribution to journalArticle


Separately confined double quantum well AlGaAs-GaAs ridge waveguides have been operated as optical modulators using the plasma effect at a wavelength of 1.15 μm. We report on the observation of a polarisation dependence in the plasma effect caused by the quantum confinement in the TM direction. Interferometric measurements on devices with current confinement cross-sectional areas of 0.1 μm2 yield phase modulation coefficients of 1.2°/mA for the TE polarisation and 0.3°/mA for the TM polarisation.

Original languageEnglish
Pages (from-to)365-369
Number of pages5
JournalOptics Communications
Issue number6
Publication statusPublished - 15 Jan 1990

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Physical and Theoretical Chemistry
  • Electrical and Electronic Engineering

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