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. 2015 Sep 1;5:13649. doi: 10.1038/srep13649

Figure 4. Eye diagrams.

Figure 4

(a,c) are eye-diagrams of the Sinc-shaped Nyquist pulses of 3 × 12.5-GHz comb after 12.5-GBaud QPSK and 16QAM modulation; (b,d) are the eye-diagrams of the 37.5-GBaud all-optical Nyquist QPSK and 16QAM signals; (e,g) are the Sinc-shaped Nyquist pulses of the 5 × 12.5-GHz comb after modulation; (f,h) are the eye-diagrams of the 62.5-GBaud all-optical Nyquist QPSK and 16QAM signals. The time scale of all these figures is 20 ps/div.