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We introduce a new cascaded four-wave mixing technique which scales up thebandwidth of frequency combs generated by phase modulation of a continuous wavelaser while simultaneously enhancing the spectral flatness. As a result wedemonstrate a 10 GHz frequency comb with over 100 lines in a 10-dB bandwidth inwhich a record 75 lines are within a flatness of 1-dB. The cascaded four-wavemixing process increases the bandwidth of the initial comb generated bymodulation of a CW laser by a factor of five. The broadband comb hasapproximately quadratic spectral phase, which is compensated upon propagationin single mode fiber, resulting in a 10 GHz train of 940 fs pulses

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Bandwidth scaling and spectral flatness enhancement of optical frequency  combs from phase modulated continuous-wave lasers using cascaded four-wave  mixing