1 GHz spaced Er:fiber Frequency Combs Based on NPE Mode-Locked Laser

We demonstrate a GHz optical frequency comb based on nonlinear polarization evolution mode-locked Er:fiber laser. The laser delivers an average power of 280 mW, and a pulse width of pulse 69 fs. The frequency offset fceo with the signal-to-noise ratio of 32 dB was obtained by an f-to-2f waveguide module.