We report a comprehensive characterization of tunable continuous-wave (CW) and passive Q-switching laser performance Dy-doped zirconium fluoride fiber emitting around 3 µm. The in-band pumped CW operation is investigated for pump wavelengths varying from 2.7 µm to 2.825 µm, lengths ranging 0.4 m 2 m, output coupling efficiency 10% 50%, leading maximum slope 44% tuning range larger than 300 nm. ...