High-Repetition-Frequency Low-Noise Fiber Ring Lasers Mode-Locked With Carbon Nanotubes

We demonstrate high-repetition-frequency low-noise passively mode-locked erbium-doped fiber ring lasers using single-walled carbon nanotubes as saturable absorbers. Pulses with a fundamental pulse repetition frequency of 200 MHz and 124-fs width are generated from a ring laser cavity. By substantially simplifying the cavity with a component that integrates multiple functions into a single device, the fundamental pulse repetition frequency could be increased to 447 MHz with pulsewidths of 270 fs.