Full C-band wavelength-tunable, 250 MHz repetition rate mode-locked polarization maintaining fiber laser

Abstract

We demonstrate a full C-band wavelength-tunable mode-locked fiber laser with a repetition rate of 250 MHz, representing the highest repetition rate for C-band tunable mode-locked lasers thus far to the best of our knowledge. The polarization-maintaining fiber-based Fabry-Perot cavity enables a fundamental repetition rate of 250 MHz with a semiconductor saturable absorber mirror as a mode-locker. We observed a stable and single soliton mode-locking state with wide tunability of the center wavelength from 1505 nm to 1561 nm by adjusting the incident angle of a bandpass filter inside the cavity. The full C-band covered wavelength-tunable high repetition rate mode-locked laser is expected to be a compelling source for many frequency-comb-based applications, including high-precision optical metrology, broadband absorption spectroscopy, and broadband optical frequency synthesizers.