A Watt-level noise-like Tm-doped fiber oscillator by nonlinear polarization rotation

Abstract We propose a high-power, noise-like pulse (NLP), Tm-doped fiber oscillator applying the nonlinear polarization rotation method. The repetition rate is 12.94 MHz resulting in a pulse energy of 75.7 nJ. The emitted mode-locking spectrum can be tuned from 1885 nm to 1949 nm in a 64 nm spectral range. A theoretical model is built to illustrate the NLP dynamics and its boundary conditions with a soliton pulse inside the 2 μ m fiber ring cavity. The corresponding simulation results match well with our experimental results.