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In this contribution we demonstrate the generation of a frequency comb with sub-picosecond pulses by seeding an amplifier with two narrow linewidth laser diodes separated by 50 GHz. The results are achieved in the normal dispersion regime with parameters where the forming of the comb is dominated by self-phase modulation. A numerical simulation is performed with different nonlinear interaction lengths, whereas the experimental realization is done in a high power Yb-doped fiber amplifier to generate the necessary nonlinearity. An output power of 750 W with compression to sub-picosecond pulse durations is shown. Further perspectives towards higher power levels and larger comb-line spacing are discussed.

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