Refractive index modulation based on excitonic effects in GaInAs-InP coupled asymmetric quantum wells

Carsten Thirstrup

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    Abstract

    The effect of excitons in GaInAs-InP coupled asymmetric quantum wells on the refractive index modulation, is analyzed numerically using a model based on the effective mass approximation. It is shown that two coupled quantum wells brought in resonance by an applied electric field will, due to the reduction in the exciton oscillator strengths, have a modulation of the refractive index which is more than one order of magnitude larger than in a similar quantum well structure based on the quantum confined Stark effect, but with no coupling between the quantum wells. Calculations show that combining this strong electrorefractive effect with self-photo-induced modulation in a biased-pin-diode modulator configuration, results in an optical nonlinearity with a figure of merit of 20 cm3/J at a wavelength of 1.55 μm. This value is large compared to optical nonlinearities originating from band edge resonance effects in III-V semiconductor materials
    Original languageEnglish
    JournalI E E E Journal of Quantum Electronics
    Volume31
    Issue number6
    Pages (from-to)988-996
    ISSN0018-9197
    DOIs
    Publication statusPublished - 1995

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