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

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(a) is the optical spectra of the generated 3-tone comb with 12.5 GHz carrier spacing after the PM-TOF; (c) is the 5-tone comb with 12.5 GHz carrier spacing after PM-TOF. The resolution in (a) and (b) is 0.02-nm. (c) and (d) are the Sinc-shaped Nyquist pulses of the 3 × 12.5 and 5 × 12.5-GHz combs. The time scale of (c) and (d) is 20 ps/div.