Simplified Analysis of Coplanar Waveguide for LiNbO_3 Optical Modulator by Variational Method (Special Issue on Optical/Microwave Interaction Devices, Circuits and Systems)

概要

論文の詳細を見る
A coplanar-type TW electrode is analyzed for the use within a Ti:LiNbO_3 optical modulator. The quasistatic analysis is developed based on the variational principle and the incremental inductance formula. The anisotropy of the LiNbO_3, the effect of the SiO_2 buffer layer, the overlaid conductor and the electrode thickness can be taken into consideration easily by using the extended spectral domain approach (ESDA) as the formulation procedure. It is shown numerically that the TW electrodes thickness, t, and the overlay spacing, p, are as dominant as the buffer layer thickness d, i.e., the microwave effective index and the product Δf・L is affected significantly by the electrodes thickness t and the overlay spacing, whereas the product V_π・L is insensitive. Therefore, the introduction of the overlaid conductor and the use of thicker electrodes can be utilized effectively to achieve higher values of the figure of merit Δf / V_π.
社団法人電子情報通信学会の論文
1993-02-25