We　report　a　simple　and　compact　all-fiber　laser　system　that　is　capable　of　generating　widely　tunable　femtosecond　pulses　from　1.6　to　2.32　mu　m.　The　pulses　are　produced　by　utilizing　the　soliton　self-frequency　shift　in　a　highly　non-linear　fiber　pumped　by　an　Er-doped　mode-locked　fiber　laser.　Two　stages　of　single-clad　Tm:fiber　amplifiers　are　used　to　amplify　the　pulses　to　a　higher　pulse　energy　of　10.9　nJ　with　pulse　width　of　94　fs,　and　corresponding　to　peak　power　of　105　kW　at　around　1.93　mu　m.　Running　a　few　hours,　the　all-fiber　laser　system　exhibits　exceptional　stability　with　a　signal-to-noise　ratio　as　high　as　70　dB.