Optical waveguide device, optical chip, and communication device

An optical chip, comprising:

• an optical waveguide device;
• a substrate;
• a target structure;
• and
• an electro-optic crystal structure, wherein:
• the target structure comprises an insulation layer and a first optical waveguide;
• a bonding region of the insulation layer includes a first groove;
• the first optical waveguide is embedded into the first groove;
• a surface of the first optical waveguide positioned away from the substrate is flush with a surface of the bonding region positioned away from the substrate;
• and
• the electro-optic crystal structure is bonded to a side of the target structure that is positioned away from the substrate.

A communication device, comprising:

• an optical chip including an optical waveguide device, wherein the optical waveguide device comprises a substrate, a target structure, and an electro-optic crystal structure;
• the target structure comprises an insulation layer and a first optical waveguide;
• a bonding region of the insulation layer includes a first groove, the first optical waveguide is embedded into the first groove, and a surface of the first optical waveguide positioned away from the substrate is flush with a surface of the bonding region that is positioned away from the substrate;
• and
• the electro-optic crystal structure is bonded to a side is of the target structure positioned away from the substrate.