Simplified Analysis of Coplanar Waveguide for LiNbO<SUB>3</SUB> Optical Modulator by Variational Method

Toshihide KITAZAWA; David POLIFKO; Hiroyo OGAWA

Simplified Analysis of Coplanar Waveguide for LiNbO₃ Optical Modulator by Variational Method

Toshihide KITAZAWA, David POLIFKO, Hiroyo OGAWA

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A coplanar-type TW electrode is analyzed for the use within a Ti:LiNbO₃ optical modulator. The quasistatic analysis is developed based on the variational principle and the incremental inductance formula. The anisotropy of the LiNbO₃, the effect of the SiO₂ 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 ΔfL 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.

Publication: IEICE TRANSACTIONS on Electronics Vol.E76-C No.2 pp.244-250

Publication Date: 1993/02/25

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Type of Manuscript: Special Section PAPER (Special Issue on Optical/Microwave Interaction Devices, Circuits and Systems)

Category: Optical/Microwave Devices

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Toshihide KITAZAWA, David POLIFKO, Hiroyo OGAWA, "Simplified Analysis of Coplanar Waveguide for LiNbO3 Optical Modulator by Variational Method" in IEICE TRANSACTIONS on Electronics, vol. E76-C, no. 2, pp. 244-250, February 1993, doi: .
Abstract: A coplanar-type TW electrode is analyzed for the use within a Ti:LiNbO₃ optical modulator. The quasistatic analysis is developed based on the variational principle and the incremental inductance formula. The anisotropy of the LiNbO₃, the effect of the SiO₂ 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 ΔfL 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.
URL: https://globals.ieice.org/en_transactions/electronics/10.1587/e76-c_2_244/_p

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@ARTICLE{e76-c_2_244,
author={Toshihide KITAZAWA, David POLIFKO, Hiroyo OGAWA, },
journal={IEICE TRANSACTIONS on Electronics},
title={Simplified Analysis of Coplanar Waveguide for LiNbO3 Optical Modulator by Variational Method},
year={1993},
volume={E76-C},
number={2},
pages={244-250},
abstract={A coplanar-type TW electrode is analyzed for the use within a Ti:LiNbO₃ optical modulator. The quasistatic analysis is developed based on the variational principle and the incremental inductance formula. The anisotropy of the LiNbO₃, the effect of the SiO₂ 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 ΔfL 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.},
keywords={},
doi={},
ISSN={},
month={February},}

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TY - JOUR
TI - Simplified Analysis of Coplanar Waveguide for LiNbO3 Optical Modulator by Variational Method
T2 - IEICE TRANSACTIONS on Electronics
SP - 244
EP - 250
AU - Toshihide KITAZAWA
AU - David POLIFKO
AU - Hiroyo OGAWA
PY - 1993
DO -
JO - IEICE TRANSACTIONS on Electronics
SN -
VL - E76-C
IS - 2
JA - IEICE TRANSACTIONS on Electronics
Y1 - February 1993
AB - A coplanar-type TW electrode is analyzed for the use within a Ti:LiNbO₃ optical modulator. The quasistatic analysis is developed based on the variational principle and the incremental inductance formula. The anisotropy of the LiNbO₃, the effect of the SiO₂ 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 ΔfL 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.
ER -