Title :
Seventeen-GHz directional coupler optical modulator
Author :
Yu, Mark ; Gopinath, Anand
Author_Institution :
Dept. of Electr. Eng., Minnesota Univ., Minneapolis, MN, USA
fDate :
9/1/1995 12:00:00 AM
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;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
