Electro-optic modulator and electro-optic device

An electro-optic modulator, comprising:

• a substrate;
• an isolation layer located on the substrate;
• a thin film layer configured to form a first optical waveguide and a second optical waveguide, an arrangement of the first optical waveguide and the second optical waveguide causing the thin film layer to comprise a first edge region, the first optical waveguide, an intermediate region, the second optical waveguide and a second edge region;
• an electrode, the electrode comprising a first ground electrode, a signal electrode and a second ground electrode, wherein the first ground electrode, the signal electrode, and the second ground electrode are sequentially arranged at intervals, the first ground electrode comprising at least a first main electrode, the second ground electrode comprising at least a second main electrode, the signal electrode comprising at least a third main electrode, the first optical waveguide being arranged in a first gap between the first main electrode and the third main electrode, the second optical waveguide being arranged in a second gap between the second main electrode and the third main electrode, the first main electrode and the second main electrode being arranged on a horizontal plane having a first height, the third main electrode being arranged on a horizontal plane having a second height, and the first height being different from the second height;
• and
• a covering layer, the covering layer at least partially covering an upper surface of the thin film layer, and a refractive index of the covering layer being lower than a refractive index of the thin film layer.