Photonic bandgap Bragg fibers feature periodic sequence of layers of different materials. In those particular waveguides, the wave path is controlled by a periodical spatial modification of the refractive index. Depending on the periodicity of the structure and on the refractive index contrast, a specific wavelength range is propagated along the fiber axis. In this work, we developed all-polymeric photonic bandgap Bragg fibers based on polystyrene (PS)/polymethyl methacrylate (PMMA) alternating layers. We describe a novel and efficient method for the preparation of the fibers preforms, and we present the fibers drawing process and the transmission properties of the resulting Bragg fibers. POLYM. ENG. SCI., 50:1122-1127, 2010. (C) 2009 Society of Plastics Engineers