Seventeen-GHz directional coupler optical modulator

Author

Yu, Mark ; Gopinath, Anand

Author_Institution

Dept. of Electr. Eng., Minnesota Univ., Minneapolis, MN, USA

Volume

43

Issue

9

fYear

1995

fDate

9/1/1995 12:00:00 AM

Firstpage

2198

Lastpage

2202

Abstract

The design of our high-speed directional coupler modulators at 0.83 μm used a semi-vectorial finite difference solver to obtain the odd and even mode optical propagation constants in the AlGaAs waveguide structure and a quasistatic finite difference code to obtain the RF characteristics of the electrode structure, which was an asymmetric coplanar waveguide modified capacitance loading. The measured drive voltage of the modulators, for 10-90% response, varied between 22 and 27 V, compared with the theoretical value of 25 V. The 3 dB bandwidth of 17 GHz was obtained for this capacitive-loaded design, with 2500 mm interaction length, and is in good agreement with the predicted result

Keywords

III-V semiconductors; aluminium compounds; coplanar waveguides; directional couplers; electro-optical modulation; finite difference methods; gallium arsenide; optical communication equipment; optical fibre communication; 0.83 micrometre; 17 GHz; 22 to 27 V; RF characteristics; asymmetric coplanar waveguide; directional coupler optical modulator; drive voltage; even mode; linear electrooptical modulator; modified capacitance loading; odd mode; optical propagation constants; quasistatic finite difference code; semi-vectorial finite difference solver; Coplanar waveguides; Directional couplers; Finite difference methods; High speed optical techniques; Modulation coding; Optical design; Optical modulation; Optical propagation; Optical waveguide theory; Optical waveguides;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.414564

Filename

414564