Patent ID: 7778497

Claim:
An optical modulator comprising an optical modulation part and a connection part for an optical fiber propagating light: the optical modulation part comprising a modulation substrate comprising an electro-optic material having a first end face and a second end face, a modulation optical waveguide formed on the modulation substrate, a radio frequency interaction portion for applying a voltage on the modulation optical waveguide to modulate propagation light, a first supporting substrate comprising a first end face and a second end face and a first adhesion layer for adhering the modulation substrate to the first supporting substrate, the first adhesion layer comprising a first end face and a second end face; the connection part comprising a connection substrate comprising an electro-optic material having a first end face and a second end face, a connection optical waveguide formed on the connection substrate, a second supporting substrate comprising a first end face and a second end face and a second adhesion layer for adhering the connection substrate to the second supporting substrate, the second adhesion layer comprising a first end face and a second end face; wherein the first end face of the modulation substrate is directly adhered to the second end face of the connection substrate, wherein the first end face of the first supporting substrate is directly adhered to the second end face of the second supporting substrate, wherein an end face of the modulation optical waveguide at the first end face of the modulation substrate is connected to and directly contacts an end face of the connection optical waveguide at the second end face of the connection substrate, and wherein a thickness of the modulation substrate is smaller than that of the connection substrate.