Wepresenttherecentresearchprogressesofourgrouponmid-infraredpulsedfiberlasersat3μmbypassiveswitching.Threedifferentkindsofsaturableabsorbersincludingsemiconductorsaturableabsorber(SESAM),Fe2+:ZnSecrystal,andtopologicalinsulator(TI)wereusedtoperformthepulsegeneration,respectively.Thetemporalregimesofmodelocking,Q-switching,andQ-switchinginducedgainswitchingweregained.Somerelativediscussionsandprospectiveeffortsareproposedattheendofthispaper.