We　demonstrated　stable　pulses　generation　at　2　mu　m　in　a　passively　Q-switched　thulium-doped　all-fiber　laser　using　a　few　layer　graphene　thin　films.　The　thulium-doped　gain　fiber　was　cladding-pumped　through　a　pump　combiner　by　two　multimode　diode　lasers　at　790　nm　in　a　unidirectional　ring　cavity.　The　maximum　output　power　the　Q-switched　fiber　laser　was　4.5　mW　and　the　single　pulse　energy　was　85　nJ　at　53　kHz　repetition　rate,　and　the　pulse　width　was　1.4　mu　s.　The　pulse　width　and　the　repetition　rate　of　the　Q-switched　fiber　laser　can　be　changed　along　with　the　pump　power.　In　addition,　we　also　demonstrated　the　mode-locked　thulium-doped　all-fiber　laser　with　graphene　oxide　depositing　on　a　broadband　reflective　mirror　as　a　passive　mode-locker　in　a　similar　cavity　configuration.　The　mode-locked　fiber　laser　produced　average　output　power　of　1.8　mW　and　the　repetition　rate　was　3.17　MHz,　corresponding　to　the　single　pulse　energy　of　0.56　nJ.　To　the　best　of　our　knowledge,　this　is　the　first　report　of　graphene　or　graphene　oxide　saturable　absorber　operation　at　2　mu　m　wavelength.