WAVELENGTH DEMULTIPLEXER UTILIZING STRATIFIED WAVE-GUIDES WITH A TAPERED BUFFER LAYER

In this paper, a novel Y-junction type demultiplexer utilizing a stratified-waveguide configuration in the branching region is proposed for the purpose of improving the extinction ratio. A high extinction ratio of about 20 dB is achieved at 0.6328 mum and 0.83 mum operation wavelengths both for the TE and TM modes. The properties of the new type branching waveguides which consist of the diffused waveguide and the striploaded waveguide are described to explain the operation principle. Simulation results by the BPM are also shown to check the designed values of the waveguide parameters.