An all-fiber 2μm wavelength tunable mode-locked laser

We propose an all-fiber thulium-doped wavelength tunable mode-locked laser operating near 2 μm. Reliable self-starting mode locking over 50nm tuning range is observed using fiber taper based carbon nanotube (FTCNT) saturable absorber (SA). Spectral tuning is achieved by stretching another fiber taper.