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We observe a large electroabsorption effect in a GaSb/AlGaSb MQW, and use it to make a waveguide modulator with a 10.5 dB on/off ratio and a 12dB insertion loss at a wavelength of 1.55μm. Our high-speed device has a 3dB rolloff frequency of 3.7 GHz.
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Wood et al. (1987) studied this question.
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