Optical modulator

An optical modulator, comprising:

• a substrate in which an optical waveguide is formed,
• wherein the optical modulator includes at least a first optical modulation section and a second optical modulation section which modulate light waves which propagate through the optical waveguide,
• a first light-receiving element that receives a light wave that is modulated in the first optical modulation section, and a second light-receiving element that receives a light wave that is modulated in the second optical modulation section are disposed in the substrate,
• at least a part of a first electrical line that guides a light-receiving signal output from the first light-receiving element to an outer side of the substrate, and at least a part of a second electrical line that guides a light-receiving signal output from the second light-receiving element to an outer side of the substrate are formed in the substrate, and
• crosstalk suppression means, which suppresses crosstalk between the first electrical line and the second electrical line, is provided between the part of the first electrical line and the part of the second electrical line which are formed in the substrate.