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. 2014 Aug 21;4:6156. doi: 10.1038/srep06156

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(a) shows the optical spectrum of the Nyquist pulse of 3 × 25-GHz comb after the PM-TOF and before modulation (b) shows the time-domain Nyqusit pulse waveform of the 3 × 25-GHz comb; (c) shows the waveform of the multiplexed 75-GBaud Nyquist QPSK signal; (d) shows the modulated and multiplexed 75-GBaud Nyquist QPSK signal. The power difference of each tone in the comb is less than 0.3 dB. The resolution of (a) and (d) is 0.02 nm.