Patent ID: 8923657

Claim:
An electro-optic modulator, comprising: a substrate comprising a top surface; a Y-shaped waveguide implanted into the top surface and comprising a first branch and a second branch, the first branch being dedicated for transmitting transverse electric wave and the second branch being dedicated for transmitting transverse magnetic wave; a ground electrode; a first modulating electrode; and a second modulating electrode; wherein the substrate defines a first groove, a second groove, and a third groove in the top surface, the first groove is positioned between the first branch and the second branch, spacing the first branch and the second branch, the second groove is positioned at a side of the first branch opposite to the first groove, the third groove is positioned at a side of the second branch opposite to the first groove, the first modulating electrode and the ground electrode are located at two sides of the first branch, the first modulating electrode is positioned in the second groove and covers a first sidewall of the second groove adjacent to the first branch, the ground electrode entirely covers the first groove and the second branch, and the second modulating electrode is positioned in the third groove and covers a bottom surface of the third groove.