Title :
High-speed shielded velocity-matched Ti:LiNbO3 optical modulator
Author_Institution :
NTT Opto-Electron. Labs., Kanagawa, Japan
fDate :
9/1/1993 12:00:00 AM
Abstract :
A shielded velocity-matched Ti:LiNbO3 optical modulator is investigated, focusing on the characteristics of the traveling-wave (TW) electrode and the optical waveguide. The optical waveguide is analyzed and its parameters are determined using the newly developed modified-step-segment method (MSSM). The TW electrode is analyzed using the second-order triangular element quasi-TEM finite element method (FEM). By taking the thickness of the coplanar waveguide (CPW) traveling-wave (TW) electrode into consideration, it is confirmed that there is an optimum overlaid layer thickness for a given electrode thickness. It is also shown that very wide modulation bandwidth can be attained by using the optimum CPW TW electrode thickness and overlaid layer thickness
Keywords :
electro-optical devices; electrodes; integrated optics; lithium compounds; optical modulation; optical waveguide theory; titanium; LiNbO3:Ti; coplanar waveguide; high-speed; modified-step-segment method; optical modulator; optical waveguide; optimum overlaid layer thickness; overlaid layer thickness; quasi-TEM finite element method; second-order triangular element; shielded; traveling-wave electrode; velocity-matched; very wide modulation bandwidth; Anisotropic magnetoresistance; Bandwidth; Coplanar waveguides; Electrodes; Finite element methods; High speed optical techniques; Optical buffering; Optical modulation; Optical waveguides; Support vector machines;
Journal_Title :
Quantum Electronics, IEEE Journal of
