Photonics-assisted　frequency　conversion　based　on　cascaded　modulators　is　an　effective　way　to　satisfy　the　requirements　of　distributed　antenna　array　applications.　A　filter-free　photonic　image-rejection　down-converter　with　immunity　to　dispersion-induced　power　fading　is　proposed　and　demonstrated.　The　radio　frequency　(RF)　signal　from　the　distributed　antenna　unit　is　injected　into　a　dual-drive　Mach-Zehnder　modulator　(DDMZM)　through　an　electrical　90　degrees　hybrid　coupler　(HC),　and　a　single-sideband　(SSB)　signal　is　realized.　It　is　then　transmitted　to　the　center　office　by　an　optical　fiber　link.　At　the　center　office,　the　modulated　RF　signal　is　injected　into　a　dual-polarization　dual-parallel　MZM　(DP-DPMZM)　after　a　polarization　controller　(PC).　Afterwards,　an　LO　signal　remodulates　it　through　the　Y-DPMZM,　and　carrier-suppressed　SSB　modulation　is　fulfilled　via　another　electrical　90　degrees　HC.　After　the　power　splitting,　quadrature　I　and　Q　IF　signals　can　be　obtained　by　a　photonics-based　continuously　adjustable　phase　shifter.　Through　a　combination　of　the　I/Q　IF　signals　with　a　low-frequency　electrical　90　degrees　HC,　a　photonics　image-rejection　down-converter　based　on　phase　cancellation　is　realized.　Moreover,　no　optical　filter　is　required;　thus,　the　image-rejection　down-converter　can　work　with　a　large　bandwidth.　The　proposed　filter-free　photonic　image-rejection　down-converter　is　theoretically　analyzed　and　experimentally　verified.