1GHz All-Fiber Laser Frequency Comb

We demonstrate the stable and robust operation of an all-polarization-maintained ultra-high frequency Fabry–Pérot cavity passively mode-locked fiber laser. The laser operates in an all anomalous-dispersion solitonic regime, generating a 1GHz pulse train. The cavity of the laser is configured by a single fiber of a single type, highly doped and polarization maintaining. Its propierties are studied by a variety of measurements, which confirm the high stability of the laser in the spectral–both optical and electrical-domains. Pulse durations of 2.55ps, optical spectrum stability < 0.3dB, average power output of 105mW and long-term uninterrumped operation during 48h with 0.25% variation (standard deviation) in the average output power are obtained. In the RF domain, 100dB signal-to-noise ratio are measured at 200kHz offset from the fundamental harmonic frequency. The theoretical validation of our experimental results is based on solutions of the Nonlinear Schrödinger Equation.