Analysis of LiNbO/sub 3/ optical modulator using coplanar-type electrodes

Author

Kitazawa, T. ; Polifko, D. ; Ogawa, H.

Author_Institution

Dept. of Electr. Eng., Ibaraki Univ., Hitachi, Japan

fYear

1993

Firstpage

213

Abstract

The coplanar-type traveling-wave (TW) electrode of the Ti: LiNbO/sub 3/ optical modulator is studied, taking the anisotropy of the LiNbO/sub 3/, the effect of the SiO/sub 2/ buffer layer, the overlay, and the electrode thickness into consideration. Accurate hybrid-mode computations reveal that the figure of merit Delta f/V/sub pi / is affected significantly by the electrode thickness and the overlay, and that the modulator performance can be improved by utilizing these effects advantageously. Numerical computations show that an upper frequency limit exists where mode coupling occurs. Therefore, special care should be taken in choosing the thickness of the LiNbO/sub 3/.<>

Keywords

electro-optical devices; electrodes; lithium compounds; optical modulation; LiNbO/sub 3/ optical modulator; LiNbO/sub 3/:Ti-SiO/sub 2/; SiO/sub 2/ buffer layer; coplanar-type electrodes; electrode thickness; figure of merit; hybrid-mode computations; mode coupling; overlay; travelling-wave electrode; upper frequency limit; Anisotropic magnetoresistance; Bandwidth; Buffer layers; Conductors; Electrodes; Geometrical optics; High speed optical techniques; Optical attenuators; Optical buffering; Optical modulation;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium Digest, 1993., IEEE MTT-S International

Conference_Location

Atlanta, GA, USA

ISSN

0149-645X

Print_ISBN

0-7803-1209-0

Type

conf

DOI

10.1109/MWSYM.1993.276840

Filename

276840