Linearly　frequency　modulated　(LFM)　microwave　signals　have　received　extensive　attention　due　to　their　powerful　target　detection　capability.　A　photonic-Assisted　chirp　microwave　waveform　generation　scheme　with　switchable　bands　is　proposed　based　on　a　dual-polarization　dual-parallel　Mach-Zehnder　modulator　(DP-DPMZM).　A　radio　frequency　(RF)　signal　and　a　baseband　linearly　frequency　modulated　(LFM)　signal　are　applied　on　DPMZMX　and　DPMZMY,　respectively.　For　the　generation　of　LFM　signal　at　one　band,　both　DPMZMX　and　DPMZMY　are　biased　to　achieve　carrier　suppressed　single　sideband　modulation　(CS-SSB).　When　changing　the　phase　shift　between　the　two　RF　signals　and　the　bias　voltages　applied　on　the　DPMZMX,　the　+2nd-order　sideband　and　optical　carrier　are　obtained　at　X　polarization　state.　Meanwhile,　DPMZMY　is　biased　to　achieve　single　sideband　(SSB)　modulation　at　Y　polarization　state.　Owing　to　the　polarization　property　of　optical　signal,　the　optical　carrier　can　be　cancelled,　thus　a　LFM　signal　at　another　band　can　be　generated.　An　experiment　is　conducted　to　validate　the　proposed　scheme.　Experimental　results　show　that　down-chirped　LFM　signals　at　X-band　and　K-band　are　obtained.　Since　the　SSB　modulation　is　adopted　for　the　system,　the　dispersion-induced　power　fading　can　be　eliminated.　The　proposed　scheme　has　wide　applications　in　multi-Target　and　long-distance　detection　in　radar　systems.　　©　COPYRIGHT　SPIE.　Downloading　of　the　abstract　is　permitted　for　personal　use　only.