US 11,940,708 B2
Optical modulator
Norikazu Miyazaki, Tokyo (JP); Kosuke Okahashi, Tokyo (JP); and Masayuki Motoya, Tokyo (JP)
Assigned to SUMITOMO OSAKA CEMENT CO., LTD., Tokyo (JP)
Appl. No. 17/599,916
Filed by SUMITOMO OSAKA CEMENT CO., LTD., Tokyo (JP)
PCT Filed Sep. 26, 2019, PCT No. PCT/JP2019/037728
§ 371(c)(1), (2) Date Sep. 29, 2021,
PCT Pub. No. WO2020/202605, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 2019-067732 (JP), filed on Mar. 29, 2019.
Prior Publication US 2022/0197104 A1, Jun. 23, 2022
Int. Cl. G02F 1/225 (2006.01); G02F 1/035 (2006.01); G02F 1/21 (2006.01)
CPC G02F 1/2255 (2013.01) [G02F 1/035 (2013.01); G02F 1/212 (2021.01)] 5 Claims
OG exemplary drawing
 
1. An optical modulator comprising:
a substrate having an electro-optic effect and the thickness of the substrate being 20 μm or less;
an optical waveguide having a rib structure, the optical waveguide includes at least one Mach-Zehnder type optical wavequide; and
a control electrode that is formed on the substrate, the control electrode includes two ground electrodes sandwiching three signal electrodes, the three signal electrodes are composed of a first signal electrode, and second and third signal electrodes that sandwich the first signal electrode, and have a wiring structure in which one modulation signal of a differential signal is applied to the first signal electrode, and the other modulation signal of the differential signal is applied to the second and third signal electrodes, and one branched waveguide of two branched waveguides of the Mach-Zehnder type optical waveguide is disposed between the first and second signal electrodes, and the other branched waveguide is disposed between the first and third signal electrodes, and at least a part of the first to third signal electrodes is divided into two electrodes along an extending direction of the optical wavequide, and an electrical connection is partially provided between the divided electrodes along the extending direction.