Wavelength Demultiplexer Utilizing Stratified Waveguides with a Tapered Buffer Layer

Kiyoshi KISHIOKA  Heihachiro OCHIAI  

IEICE TRANSACTIONS on Electronics   Vol.E76-C    No.10    pp.1491-1497
Publication Date: 1993/10/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on the 1992 Symposium on Electromagnetic Theory)
Category: Optical Device
demultiplexer,  branching waveguides,  Y junction,  integrated optical device,  

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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 µm and 0.83 µm operation wavelengths both for the TE and TM modes. The properties of the new type branchig 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.