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Analysis of coplanar LiNbO 3 waveguide structures applicable to electrooptic modulator with FDTD method
Author(s) -
Lee Byungje,
Byun Joonho,
Kim BokKi
Publication year - 2003
Publication title -
microwave and optical technology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.304
H-Index - 76
eISSN - 1098-2760
pISSN - 0895-2477
DOI - 10.1002/mop.11178
Subject(s) - finite difference time domain method , coplanar waveguide , materials science , microwave , waveguide , lithium niobate , buffer (optical fiber) , substrate (aquarium) , anisotropy , optoelectronics , optics , characteristic impedance , electrical impedance , electrical engineering , computer science , engineering , telecommunications , physics , oceanography , geology
The 3D finite‐difference time‐domain (FDTD) method and the 2D 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. © 2003 Wiley Periodicals, Inc. Microwave Opt Technol Lett 39: 234–237, 2003; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.11178