STUDY ON X-SHAPED PHOTONIC CRYSTAL WAVEGUIDE IN 2D TRIANGULAR LATTICE FOR WDM SYSTEM
Keywords:
microwave, periodic structure, photonic crystal, wavelength division multi- plexing, X-shaped branch waveguide, Y-shaped branch waveguideAbstract
For wavelength division multiplexing system, X-shaped waveguide situated in two di- mensional pillar type photonic crystal structure was studied in this paper. Propagation and filtering characteristics of some types of the waveguide were experimentally investi- gated. Measurement was done by using a model in microwave frequency around 4 GHz with lattice period P=26.5 mm, diameter of pillar =7.5 mm and its dielectric constant "r=36.0. First, symmetric X waveguide was measured to show its basic transmission characteristics. After the measurement, three cavities with a pair of dielectric rods were situated in each output waveguide to perform a filtering function. Next, asymmetric X waveguide with cavities was examined to improve filtering characteristics in each out- put port. For the asymmetric structure, higher extinction ratio and higher Q-factor were obtained, compared to symmetric structure. Finally, filtering characteristics of the asymmetric X-shaped waveguide was compared with the result of Y-shaped cascaded waveguide with 4 outputs. The asymmetric X-shaped waveguide showed better results with higher resonant peak amplitude than that of Y-shaped waveguide. Applying good resolution characteristics of 40MHz with respect to input frequency, proposed asym- metric X-branch circuit is available for signal add/drop device for wavelength division multiplexing (WDM) system.
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