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We report, to the best of our knowledge, the highest symbol rate of 220 GBaud in optical back-to-back QPSK transmission enabled by a new 256 GSa/s SiGe arbitrary waveform generator, a >50 GHz 6 dB bandwidth GaAs IQ modulator and advanced nonlinear DSP.
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Pittale et al. (2020) studied this question.
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