A novel crosslinkable dendritic polymer has been synthesized by the thermal polymerization of peripheral aryl trifluorovinyl ether moieties of a highly fluorinated dendrimer. The resulting perfluorocyclobutane(PFCB)-containing dendritic polymer exhibited excellent processability, low optical loss (0.36 dB (.) cm(-1) at 1310 nm with 1% dye doping), high thermal stability, and good solvent resistance for waveguide-based photonic applications.