1.6 µm laser emission from the Er:Yb doped double-clad fiber amplifier

In this paper, we demonstrate the possibility to obtain laser emission above 1.6 µm from a C-band Er:Yb doped fiber amplifier thanks to the control of linear losses of the cavity. The principle is validated in figure-of-eight fiber laser. This concept is then successfully used to realize a widely tunable graphene-based mode-locked fiber laser.