US 12,474,619 B2
Optical modulator and optical transmission device using same
Toshio Kataoka, Tokyo (JP); and Shingo Takano, Tokyo (JP)
Assigned to SUMITOMO OSAKA CEMENT CO., LTD., Tokyo (JP)
Appl. No. 18/267,695
Filed by SUMITOMO OSAKA CEMENT CO., LTD., Tokyo (JP)
PCT Filed Dec. 23, 2021, PCT No. PCT/JP2021/047930
§ 371(c)(1), (2) Date Jun. 15, 2023,
PCT Pub. No. WO2022/145342, PCT Pub. Date Jul. 7, 2022.
Claims priority of application No. 2020-219102 (JP), filed on Dec. 28, 2020.
Prior Publication US 2024/0061309 A1, Feb. 22, 2024
Int. Cl. G02F 1/225 (2006.01); G02B 6/42 (2006.01); G02F 1/035 (2006.01)
CPC G02F 1/225 (2013.01) [G02B 6/4277 (2013.01); G02F 1/0356 (2013.01); G02F 1/2255 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An optical modulator comprising:
a modulation substrate that includes an optical waveguide and a modulation electrode for modulating a light wave which propagates through the optical waveguide; and
a wiring substrate provided with wiring for relaying a modulation signal to be applied to the modulation electrode,
wherein the wiring substrate is disposed to overlap with the modulation substrate to cover an action portion on which modulation is performed by the modulation electrode,
an electromagnetic wave absorption member is disposed in the wiring substrate at at least a part of a position facing the action portion,
the modulation electrode includes a signal electrode and a ground electrode disposed to interpose the signal electrode,
the electromagnetic wave absorption member is disposed to face the ground electrode and is not disposed over the signal electrode, and
a length of the electromagnetic wave absorption member extends in a direction along the signal electrode to an outside of the action portion of the signal electrode.