Fiber　Optic　Gyroscope　is　an　angular　velocity　sensitive　device　based　on　Sagnac　effect.　Super　Luminescent　Diode　(SLD)　is　a　widely　used　light　source　in　fiber　optic　gyroscope,　and　its　characteristics　will　directly　affect　the　overall　performance　of　gyroscope.　In　this　paper,　the　working　mechanism　of　SLD　light　source　is　studied,　and　the　photoelectric　characteristics　of　SLD　light　source　and　the　influence　of　light　source　temperature　and　driving　current　on　center　wavelength　are　analyzed.　According　to　the　relationship　between　the　central　wavelength　of　the　light　source　and　the　driving　current　and　die　temperature,　a　three-dimensional　model　of　the　central　wavelength　of　the　light　source　is　obtained.　In　order　to　control　the　driving　current　and　die　temperature　quickly　and　stably,　the　fuzzy　PID　control　scheme　of　die　temperature　and　incremental　PID　control　scheme　of　driving　current　are　studied　and　designed.　Based　on　the　three-dimensional　model　of　the　center　wavelength　of　light　source,　the　center　wavelength　of　SLD　light　source　is　controlled　stably　and　quickly.　©　Published　under　licence　by　IOP　Publishing　Ltd.