A　stable　narrow　bandwidth　semiconductor　saturable　absorber　mirror　mode-locked　Yb-doped　fiber　laser　was　demonstrated　in　a　short　linear　cavity　with　fundamental　repetition　rate　up　to　843　MHz.　At　the　fundamental　repetition　rate　of　490　MHz,　the　maximum　output　power　was　17　mW　at　similar　to　300-mW　incident　pump　power.　The　center　wavelength　and　the　spectral　bandwidth　were　1064.1　and　0.13　nm,　respectively,　imposed　by　a　narrow　bandwidth　fiber　Bragg　grating.　The　pulsewidth　was　measured　to　be　21　ps,　and　the　time-bandwidth　product　of　the　laser　pulse　was　0.72.