Title :
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
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;
Conference_Titel :
Microwave Symposium Digest, 1993., IEEE MTT-S International
Conference_Location :
Atlanta, GA, USA
Print_ISBN :
0-7803-1209-0
DOI :
10.1109/MWSYM.1993.276840
