Patent ID: 6831767
Filing Date: 2004-12-14
Classification: B82Y,G02F

Abstract:
A traveling wave optical modulator comprising at least a transmission line, and a semiconductor chip provided at least with an electro-absorption semiconductor optical modulator, on a dielectric substrate, whereinsaid electro-absorption semiconductor optical modulator comprises at least an electrode of traveling wave modulator, and an optical waveguide overlapping with said electrode of traveling wave modulator and having a region parallel to said electrode of traveling wave modulator, said transmission line is connected at least electrically to a first end portion of said electrode of traveling wave modulator of said electro-absorption semiconductor optical modulator, said semiconductor optical modulator can be driven by inputting a high-frequency signal from a modulator driver circuit to said transmission line, and the characteristic impedance of at least a part of said transmission line is greater than the output impedance of said semiconductor optical modulator.