Comparing　with　the　conventional　double-sideband　(DSB)　modulation　in　communication　system,　single-sideband　(SSB)　modulation　only　demands　half　bandwidth　of　DSB　in　transmission.　Two　common　ways　are　employed　to　implement　SSB　modulation　by　using　optical　filter　(OF)　or　electrical　90　degrees　phase　shift,　respectively.　However,　the　bandwidth　of　above　methods　is　limited　by　characteristics　of　current　OF　and　electrical　phase　shift.　To　overcome　this　problem,　an　ultrawideband　microwave　photonic　link　based　on　SSB　modulation　is　proposed　and　demonstrated.　The　radio　frequency　(RF)　signal　modulates　a　single-drive　dual-parallel　Mach-Zehnder　modulator,　and　the　SSB　modulation　is　realized　by　combining　an　electrical　90　degrees　hybrid　coupler　and　an　optical　bandpass　filter.　The　experimental　results　indicate　that　the　system　can　achieve　SSB　modulation　for　RF　signal　from　2　to　40　GHz.　The　proposed　microwave　photonic　link　provides　an　ultra-wideband　approach　based　on　SSB　modulation　for　radio-over-fiber　system.