Electro-optic modulator

An electro-optic modulator, comprising a substrate, an isolating layer, a waveguide layer, and an electrode layer, wherein the substrate, the isolating layer, the waveguide layer, and the electrode layer are arranged in sequence, wherein

• the electrode layer comprises:
• a plurality of first sub-electrodes arranged in sequence in a first direction and a plurality of first connecting electrodes connected to the plurality of first sub-electrodes in an intersecting manner in a one-to-one correspondence;
• a plurality of second sub-electrodes arranged in sequence in the first direction and a plurality of second connecting electrodes connected to the plurality of second sub-electrodes in an intersecting manner in a one-to-one correspondence;
• a plurality of third sub-electrodes arranged in sequence in the first direction and a plurality of third connecting electrodes connected to the plurality of third sub-electrodes in an intersecting manner in a one-to-one correspondence;
• and a plurality of fourth sub-electrodes arranged in sequence in the first direction and a plurality of fourth connecting electrodes connected to the plurality of fourth sub-electrodes in an intersecting manner in a one-to-one correspondence, wherein the plurality of first sub-electrodes and the plurality of fourth sub-electrodes are configured to be grounded, the plurality of second sub-electrodes and the plurality of third sub-electrodes are configured to receive differential signals, the plurality of first sub-electrodes and the plurality of second sub-electrodes are configured to form a first electric field therebetween, and the plurality of third sub-electrodes and the plurality of fourth sub-electrodes are configured to form a second electric field therebetween that has an opposite direction to that of the first electric field;
• and
• the waveguide layer comprises a first waveguide arm and a second waveguide arm, in a cross sectional view of the substrate that is perpendicular to the first direction, the first waveguide arm is located between the plurality of first sub-electrodes and the plurality of second sub-electrodes and does not intersect with the plurality of first connecting electrodes and the plurality of second connecting electrodes, and the second waveguide arm is located between the plurality of third sub-electrodes and the plurality of fourth sub-electrodes and overlaps with the plurality of third connecting electrodes and the plurality of fourth connecting electrodes.