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We describe the successful operation of a buried heterojunction electroabsorption modulator. This modulator, fabricated from AlyGa1−yAs1−xSbx/GaAs1−x′Sbx′, is particularly well suited for use with narrow spectral width sources such as the Nd : YAG fiber lasers. The GaAs1−x′Sbx′ crystal composition can be adjusted to permit operation in the wavelength range 0.9–1.2 μm. At 1.06 μm we have obtained an extinction ratio of 13 dB and a projected insertion loss of 4.0 dB. The low device capacitance permits operation at greater than 900 MHz.
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Campbell et al. (1978) studied this question.
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