Title :
Finite-element modeling of broad-band traveling-wave optical modulators
Author :
Koshiba, Masanori ; Tsuji, Yasuhide ; Nishio, Masahiro
Author_Institution :
Dept. of Electron. & Inf. Eng., Hokkaido Univ., Sapporo, Japan
fDate :
9/1/1999 12:00:00 AM
Abstract :
A full-wave finite-element method with hybrid edge/nodal elements is, for the first time, applied to investigating the frequency dispersion of microwave propagation characteristics of broad-band traveling-wave (TW) optical modulators using planar electrode configurations. In order to produce a two-step analysis of electrooptic modulation of optical waveguides, the microwave electrode solver is linked to the optical waveguide solver. Numerical results are shown for an ultrabroad-band TW LiNbO3 Mach-Zehnder optical modulator with a ridge structure, and the necessity of using the full-wave solver is verified by comparing the calculated 3-dB bandwidth and half-wavelength voltage with the experimental data
Keywords :
Mach-Zehnder interferometers; coplanar waveguides; dispersion (wave); electro-optical modulation; finite element analysis; microwave propagation; optical communication equipment; ridge waveguides; 3-dB bandwidth; Mach-Zehnder optical modulator; broad-band traveling-wave optical modulators; electrooptic modulation; frequency dispersion; full-wave finite-element method; full-wave solver; half-wavelength voltage; hybrid edge/nodal elements; microwave electrode solver; microwave propagation characteristics; optical waveguide solver; planar electrode configurations; ridge structure; two-step analysis; Electrodes; Electrooptic modulators; Electrooptical waveguides; Finite element methods; Frequency; Microwave propagation; Microwave theory and techniques; Optical modulation; Optical propagation; Optical waveguides;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
