Fabrication of optical filters based on polymer asymmetric Bragg couplers

Abstract

In this work, we successfully developed a process to fabricate dual-channel polymeric waveguide filters based on an asymmetric Bragg coupler (ABC) using holographic interference techniques, soft lithography, and micro molding. At the cross-and self-reflection Bragg wavelengths, the transmission dips of approximately -16.4 and -11.5dB relative to the 3dB background insertion loss and the 3dB transmission bandwidths of approximately 0.6 and 0.5nm were obtained from an ABC-based filter. The transmission spectrum overlaps when the effective index difference between two single waveguides is less than 0.002. (C) 2009 Optical Society of America