Optical device

摘要

[Task] Reduction in crosstalk between signal electrodes.;[Means for Resolution] An optical modulator 1 includes a relay substrate 3 including a substrate portion 30, and signal electrodes 31 and 32, and a ground electrode 33 which are provided on the substrate portion 30, and an optical waveguide substrate 4 including an electrode-optical substrate 40, signal electrodes 431 and 432, and an optical waveguide 42 which are provided on the electro-optical substrate 40. Modulation signals are input from ends 31a and 32a on one side of the signal electrodes 31 and 32, the other end 31b of the signal electrode 31 is electrically connected to the signal electrode 431, the other end 32b of the signal electrode 32 is electrically connected to the signal electrode 432, an optical wave, which propagates through the optical waveguide 42, is modulated by the modulation signals which propagate through the signal electrodes 431 and 432, the ground electrode 33 is provided between the signal electrodes 31 and 32, and the relay substrate 3 includes a first adjacent portion 44 at which the signal electrodes 31 and 32 are adjacent to each other, and a through-hole 30g that is provided in the ground electrode 33 at the first adjacent portion 44.

主权项

1. An optical device, comprising:
a relay substrate including a substrate portion, and a first signal electrode, a second signal electrode, and a ground electrode which are provided to the substrate portion; and an optical waveguide substrate including an electrode-optical substrate having an electro-optic effect, a third signal electrode, a fourth signal electrode, and an optical waveguide which are provided on the electro-optical substrate, wherein modulation signals are input from one end of the first signal electrode and one end of the second signal electrode, respectively, the other end of the first signal electrode is electrically connected to the third signal electrode, the other end of the second signal electrode is electrically connected to the fourth signal electrode, an optical wave, which propagates through the optical waveguide, is modulated by the modulation signals which propagate through the third signal electrode and the fourth signal electrode, the ground electrode is provided between the first signal electrode and the second signal electrode, and the relay substrate includes an adjacent portion at which the first signal electrode and the second signal electrode are adjacent to each other, and an aperture that is provided in the ground electrode at the adjacent portion.