For 100G (112 Gbit/s) signals, the actual data baud rate is just 28G baud (112/2/2 = 28G).
A 112-Gbit/s dual-polarization QPSK signal transmits 2 bits per QPSK symbol on each of two polarizations, yielding a symbol rate of 112 ÷ 2 ÷ 2 = 28 Gbaud.
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