US 12,339,529 B2
Optical modulator and optical transmission device using same
Hideki Ichimei, Tokyo (JP); Minoru Shinozaki, Tokyo (JP); and Yu Kataoka, Tokyo (JP)
Assigned to SUMITOMO OSAKA CEMENT CO., LTD., Tokyo (JP)
Appl. No. 18/025,843
Filed by SUMITOMO OSAKA CEMENT CO., LTD., Tokyo (JP)
PCT Filed Jan. 26, 2022, PCT No. PCT/JP2022/002955
§ 371(c)(1), (2) Date Mar. 10, 2023,
PCT Pub. No. WO2022/163724, PCT Pub. Date Aug. 4, 2022.
Claims priority of application No. 2021-013606 (JP), filed on Jan. 29, 2021.
Prior Publication US 2023/0350235 A1, Nov. 2, 2023
Int. Cl. G02F 1/01 (2006.01)
CPC G02F 1/0113 (2021.01) [G02F 1/0102 (2013.01); G02F 1/0121 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An optical modulator comprising:
an optical control substrate that includes an optical waveguide including at least a branched waveguide which branches one light wave into two light waves, and that includes a control electrode for applying an electrical field to the branched waveguide; and
a wiring substrate provided with a wiring which relays a modulation signal to be applied to the control electrode,
wherein the control electrode is provided with a signal electrode and a ground electrode sandwiching the signal electrode,
the wiring is provided with signal wiring and ground wiring,
two waveguides of the branched waveguide sandwich the signal electrode,
in a part in which electrical connection is made between the signal electrode and the signal wiring, a distance between the two waveguides sandwiching the signal electrode is wider than a distance between the same two waveguides sandwiching the signal electrode in an action portion in which the control electrode applies the electrical field to the branched waveguide, and
in the part, in the direction in which the modulation signal travels, the ground electrode and the ground wiring are first electrically connected, and then the signal electrode and the signal wiring are electrically connected.