The Journal of Korean Institute of Electromagnetic Engineering and Science (한국전자파학회논문지)

The Korean Institute of Electromagnetic Engineering and Science (한국전자파학회)
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Analysis of Coplaner $LiNBO_3$ Waveguide Structures Applicable Electrooptic Modulator with FDTD method

  • Lee, Byung-Je (RFIC Research and Education Center & Mission Techvology Research Center, kwangwoon university) ;
  • Byun, Joon-Ho (Samsung Electronics Co. Ltd) ;
  • Kim, Nam-Young (RFIC Research and Education Center & Mission Techvology Research Center, kwangwoon university) ;
  • Kim, Jong-Heon (RFIC Research and Education Center & Mission Techvology Research Center, kwangwoon university) ;
  • Lee, Jong-Chul (RFIC Research and Education Center & Mission Techvology Research Center, kwangwoon university)
  • Published : 2000.10.01
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Abstract

The three-dimensional finite-difference time-domain (FDTD) method and the two-dimensional quasi-static formulation have been used to calculate the characteristic impedance and the microwave effective index of coplanar waveguide structures on Lithium Niobate ($LiNBO_3$) single crystal substrates with a yttria-stabilized zirconia (YSZ) or $SiO_2$ buffer layer. The results shown can be a good source to predict the modulator characteristics. The effects of the thin buffer layer and anisotropy of the $LiNBO_3$ crystal (x-cut and z-cut) are discussed. The comparison between the FDTD and quasi-static results shows good agreement. In this paper, the efficient modeling technique of the FDTD method for the coplanar waveguide (CPW) structures based on an anisotropic substrate with a thin buffer layer is developed.

Keywords

References

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