We　review　our　work　on　a　femtosecond　erbium-doped　all-fiber　laser　mode-locked　with　graphene　oxide　saturable　absorber,　which　can　be　conveniently　obtained　from　natural　graphite　by　simple　oxidation　and　ultra-sonication　process.　The　laser　directly　generated　200　fs　pulses　at　a　repetition　rate　of　22.9　MHz.　The　stable　passively　Q-switched　operation　by　graphene　oxide　saturable　absorber　in　the　1　mu　m　ytterbium-,　1.5　mu　m　erbium-,　and　2　mu　m　thulium-doped　fiber　lasers　will　be　demonstrated　as　well.　These　results　are　comparable　with　those　of　graphene　saturable　absorbers　and　the　superiority　of　easy　fabrication　and　hydrophilic　property　of　graphene　oxide　will　facilitate　its　potential　applications　for　ultrafast　photonics.