The　spectral　response　of　passive　optical　devices　reveals　the　important　characteristics　of　their　materials　and　functions　and　is　an　essential　evaluation　index　in　the　development,　production　and　application　of　optical　devices.　In　this　paper,　a　broadband　and　high-resolution　spectral　response　measurement　method　is　proposed　based　on　single　sideband　modulation　technology.　The　optical　carrier　emitted　by　the　tunable　light　source　is　incident　on　the　dual　parallel　Mach　Zehnder　modulator　(DPMZM),　and　the　Microwave　signal　emitted　by　the　frequency　source　is　loaded　on　the　modulator.　Combined　with　the　bias　voltage　and　the　hybrid　couple,　carrier　suppression　single　sideband　(CS-SSB)　modulation　is　realized.　The　modulated　signal　is　received　by　the　photodetector　after　passing　through　the　passive　optical　device　under　test,　and　frequency　of　the　single　sideband　modulated　optical　signal　can　be　swept　through　the　frequency　source.　This　signal　passes　through　the　optical　beam　splitter,　and　the　spectral　response　of　the　passive　optical　device　is　measured　by　the　balance　detection　of　two　signals.　A　broadband　high-resolution　spectral　response　measurement　system　is　constructed　in　the　experiment.　The　experimental　results　show　that　the　spectral　measurement　resolution　of　the　system　reaches　at　least　5　MHz,　and　the　measurement　range　is　1528-1568　nm.　This　measurement　method　combines　a　tunable　light　source　with　a　single　sideband　microwave　photon　scanning　frequency.　The　system　structure　is　simple,　the　measurement　accuracy　is　high,　and　the　measurement　range　is　large.　It　can　realize　the　spectrum　response　measurement　of　passive　optical　devices　such　as　narrow　linewidth　filters　and　wavelength　division　multiplexers.　©　2023　SPIE.　All　rights　reserved.