Fabrication of a polymeric optical filter based on an asymmetric Bragg coupler with liquid crystal

An optical add/drop multiplexer, based on asymmetric Bragg couplers with liquid crystal filled in a core of the waveguides, is fabricated. The asymmetric Bragg couplers (ABCs) are fabricated by employing micro-electro-mechanical systems (MEMSs) technologies and holographic interference lithography. In one of the core trench, the liquid crystal is dripped to increase the average effective refractive index of the waveguide. The experimental results show the device is feasible in dense wavelength division multiplexing (DWDM) systems.