Ultra High-Repetition-Rate Pulse Sources Based on Cascaded Four Wave Mixing in EYDF

We report all-fiber tunable ultrahigh-repetition-rate sub-picosecond pulse sources around 1550 nm. The sources are based on cascaded four wave mixing in an erbium-ytterbium co-doped fiber without extra nonlinear fiber. They are seeded by a spacing-tunable phase conjugated dual-wavelength parametric light source centered at 1550 nm. The repetition rate of the pulse sources can be tuned continuously in the range of 0.75-2.75 THz by adjusting the wavelength spacing of the dual-wavelength light source. We use auto-correlator to measure the waveform of the pulses. The duration of the pulses is about 100 fs.