Figure 6
From: High Speed All Optical Nyquist Signal Generation and Full-band Coherent Detection
Optical spectra and the time-domain waveform of the 75-GBaud Nyquist signals.
(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.
