Electro-optical modulator

The invention relates to an electro-optical modulator which comprises a base, a ridge-shaped optical waveguide structure, a first ground electrode, a first modulation electrode, a second ground electrode and a second modulation electrode. The ridge-shaped optical waveguide structure is located at the top surface of the base and comprises a ridge-shaped structure and an optical waveguide formed in the ridge-shaped structure; the ridge-shaped structure comprises a Y-shaped fork part; the fork part comprises a first branch and a second branch; the first branch comprises a first sub-Y-shaped optical waveguide and comprises a first sub-branch and a second sub-branch; the second branch comprises a second sub-Y-shaped optical waveguide and comprises a third sub-branch and a fourth sub-branch; both the first ground electrode and the first modulation electrode are used for modulating the first sub-Y-shaped optical waveguide; both the second ground electrode and the second modulation electrode are used for modulating t