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An ultrahigh-speed multiplexer (MUX) circuit has been developed for future optical transmission systems. The IC was fabricated with 160 GHz fmax AlGaAs/GaAs HBTs. Error-free 40 Gbit/s operation with an 0.8 V peak-to-peak output voltage swing was confirmed. Its 50 Gbit/s operation with an output voltage swing of 0.3 V peak-to-peak was also verified. These are, to the authors' knowledge, the fastest operation speeds ever reported for a MUX IC implemented with any type of device.
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Kuriyama et al. (1994) studied this question.
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