We propose a three-step asymmetric quantum well to enhance change in the absorption coefficient by applying electric field. Oscillator strength for the n=1 heavy hole exciton is reduced at zero bias and increased at bias voltage. This three-step structure has the advantages of a large change in absorption, low transmission loss, and low operating voltage in absorption-type optical modulators utilizing the quantum confined Stark effect.
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Susa et al. (1992) studied this question.
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