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

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Insets (b) are the 5 × 25-GHz comb, (c–f) are the eye-diagrams measured in 10 ps/div. (c) is the Sinc-shaped pulse before modulation, (d) is the four level signal generated by DAC, (e) is the Sinc-shaped pulse after modulation and (f) is the TDM signal of 125-GBaud 16QAM signals. (h) is the optical spectrum of signals after modulation. All the optical spectra are measured in 0.02 nm resolution.