Novel coplanar-strip slow-wave structure for ultrawide-bandwidth electro-optic modulators

TitleNovel coplanar-strip slow-wave structure for ultrawide-bandwidth electro-optic modulators
Publication TypeJournal Article
Year of Publication1997
AuthorsKhazaei, H. R., R. James, E. Berolo, F. Rahmatian, N. A. F. Jaeger, and F. Ghannouchi
JournalMicrowave and Optical Technology Letters
Volume15
Pagination303-305
Date PublishedAUG 5
Type of ArticleArticle
ISSN0895-2477
Keywordscoplanar strip, electro-optic modulators, slow wave
Abstract

A novel coplanar-strip (CPS) slow-wave structure for use in compound semiconductor electro-optic modulators is presented. The device uses interdigitated fins and pads to reduce the microwave phase (and group) velocity to match the speed of light in the optical waveguides, and thus to increase the bandwidth of such modulators well into the millimeter-wave range. These structures were fabricated on semiinsulating (SI) GaAs and show an electrical bandwidth in excess of 40 GHz The effects on the microwave performance of the CPS slow-wave structures due to the presence of a thin layer of SiO2 (0.2 mu m) between the ST GaAs and the metal structures, as well as the presence of the optical ridge waveguide (0.9 mu m deep) were also investigated. (C) 1997 John Wiley & Sons, Inc.

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