Title :
Millimeter-wave Ti:LiNbO3 optical modulators
Author :
Noguchi, Kazuto ; Mitomi, Osamu ; Miyazawa, Hiroshi
Author_Institution :
NTT Opto-Electron. Labs., Kanagawa, Japan
fDate :
4/1/1998 12:00:00 AM
Abstract :
The design, fabrication, and characteristics of ridged Ti:LiNbO 3 optical modulators that work in the millimeter-wave region are presented. A new concept of design under velocity matching is demonstrated for the proposed modulator. It has been shown by calculation that impedance matching is achieved and conductor loss is greatly reduced under velocity matching with wider gaps and a thicker coplanar waveguide electrode in conjunction with a ridge structure. Two types of Mach-Zehnder optical intensity modulators for the wavelength of 1.5 μm are developed. A fully packaged module for 40 Gb/s transmission with a half-wave voltage of 3.5 V and a broadband modulator responsible up to 100 GHz with a half-wave voltage of 5.1 V
Keywords :
coplanar waveguides; electro-optical modulation; impedance matching; integrated optics; lithium compounds; millimetre wave devices; modules; optical communication equipment; optical design techniques; optical fabrication; optical waveguides; packaging; titanium; 1.5 mum; 3.5 V; 40 Gbit/s; 5.1 V; Gb/s transmission; LiNbO3:Ti; Mach-Zehnder optical intensity modulators; broadband modulator; conductor loss; fully packaged module; half-wave voltage; impedance matching; millimeter-wave Ti:LiNbO3 optical modulators; ridge structure; ridged Ti:LiNbO3 optical modulator design; ridged Ti:LiNbO3 optical modulator fabrication; thicker coplanar waveguide electrode; velocity matching; Conductors; Coplanar waveguides; Impedance matching; Optical design; Optical device fabrication; Optical losses; Optical modulation; Optical waveguides; Voltage; Waveguide discontinuities;
Journal_Title :
Lightwave Technology, Journal of
