| 摘要 |
PROBLEM TO BE SOLVED: To provide a downsized optical modulator for suppressing the crosstalk of a signal electrode.SOLUTION: An optical modulator 1 includes: a substrate 41; branch waveguides 421c and 421d; and a plurality of modulation electrodes 43 disposed on the substrate 41 for modulating the light passing in the branch waveguides 421c and 421d. Each modulation electrode 43 includes signal electrodes 44a and 44b for receiving a modulation signal and ground electrodes 45a, 45b, 45c. The ground electrode 45a is disposed between the signal electrodes 44a and 44b, the ground electrode 45b is disposed on the side of the signal electrode 44a opposite to the adjacent side to the ground electrode 45a, and the ground electrode 45c is disposed on the side of the signal electrode 44b opposite to the adjacent side to the ground electrode 45a. The ground electrodes 45a, 45b, and 45c include recessed grooves 450a, 450b, and 450c, respectively. |
