A　photonic　method　for　the　reconfigurable　generation　of　switchable　multi-format　linearly　frequency　modulated　signal　(LFM)　using　a　dual-polarization　dual-parallel　Mach-Zehnder　modulator　(DP-DPMZM)　is　proposed　and　experimentally　verified.　By　properly　controlling　the　bias　voltage　applied　on　the　DP-DPMZM,　different　chirp　waveforms,　including　dual-chirped,　down-chirped　and　up-chirped　LFM　signals,　can　be　obtained　when　a　radio　frequency　(RF)　signal　and　a　baseband　chirped　signal　are　injected　into　the　modulator.　Besides,　the　central　frequency　of　the　generated　LFM　signal　can　be　converted　from　X-band　to　K-band　by　adopting　-2nd-order　sideband　instead　of　-1st-order　sideband　of　the　modulated　RF　signal.　Moreover,　the　RF　signal　is　always　single　sideband　modulated,　thus　eliminating　the　dispersion-induced　power　fading,　which　is　essential　for　the　photonics-based　distributed　multi-function　radar.　In　the　proposed　scheme,　no　optical　filter　is　required,　which　also　improves　the　stability　and　feasibility　of　the　system.　Authors