Polarization maintaining multi-segment dispersion-tailored fibers for frequency comb generation with 27 fs pulses at 10 GHz repetition rate

We demonstrate a polarization-maintaining, all-fiber electro-optic modulation comb source delivering 27.5 fs pulses at 10 GHz and 13 kW peak power. A novel architecture based on cascaded normal- and anomalous-dispersion fibers, with minimal splice loss, enables multi-stage spectral broadening and compression leading to 100 compression factor, with 65% conversion efficiency from the amplifier. These results set a new benchmark for high-repetition-rate ultra-fast comb sources suitable for nonlinear spectroscopy and dual-comb metrology.