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

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(a) the optical spectra of the generated 3-tone comb with 25-GHz carrier spacing after the PM-TOF; (c) the 5-tone comb with 25-GHz carrier spacing after PM-TOF. The resolution in (a,b) is 0.02-nm. (c,d) are the Sinc-shaped Nyquist pulses of the 3 × 25 and 5 × 25-GHz combs. The time scale of (c,d) is 10 ps/div.