Patent ID: 9746741
Date: 2017-08-29
CPC Classifications: G02F

Claim:
1. An optical modulator, comprising: a substrate; a plurality of optical waveguides; and a plurality of modulation electrodes provided on the substrate in order to modulate light propagating through the optical waveguides, wherein the modulation electrodes include signal electrodes, to which modulation signals are supplied, and ground electrodes, the signal electrodes include first and second signal electrodes, the ground electrodes include a first ground electrode provided between the first and second signal electrodes, a second ground electrode provided on the opposite side of the first signal electrode from the first ground electrode provided adjacent to the first signal electrode, and a third ground electrode provided on the opposite side of the second signal electrode from the first ground electrode provided adjacent to the first signal electrode, and a concave groove is formed in each of the first to third ground electrodes.