公开(公告)号：US20240255827A1

公开(公告)日：2024-08-01

申请号：US18390725

申请日：2023-12-20

Applicant: SUMITOMO OSAKA CEMENT CO., LTD.

Inventor： Yu KATAOKA ,  Shotaro HIRATA ,  Yumi MURATA

IPC: G02F1/225 ,  G02F1/21

CPC classification number: G02F1/225 ,  G02F1/212

Abstract: An optical waveguide device including an optical waveguide formed on a substrate is provided, in which a directional coupler is disposed in a part of the optical waveguide, the directional coupler includes one center waveguide and two side waveguides disposed to interpose the center waveguide between the side waveguides, the side waveguides are disposed to come close to the center waveguide from a position where the side waveguides are separated from the center waveguide and then to be separated again from the center waveguide in a traveling direction of a light wave, and the center waveguide and the side waveguides are not in contact with each other.

公开(公告)号：US20240255784A1

公开(公告)日：2024-08-01

申请号：US18518311

申请日：2023-11-22

Applicant: SUMITOMO OSAKA CEMENT CO., LTD.

Inventor： Shotaro HIRATA ,  Kosuke OKAHASHI

IPC: G02F1/035

CPC classification number: G02F1/035

Abstract: An optical waveguide device includes an optical waveguide formed on a substrate, in which a protuberant portion is formed on a surface of the substrate, the optical waveguide is disposed on the protuberant portion and is formed to have a larger width than a width of a part of the protuberant portion, and a low refractive index layer is disposed to cover the optical waveguide and to be in contact with at least a part of the protuberant portion, and has a lower refractive index than the optical waveguide.

公开(公告)号：US20230314732A1

公开(公告)日：2023-10-05

申请号：US18029393

申请日：2021-09-29

Applicant: SUMITOMO OSAKA CEMENT CO., LTD.

Inventor： Shotaro HIRATA ,  Shingo TAKANO ,  Yu KATAOKA

IPC: G02B6/42 ,  G02F1/01

CPC classification number: G02B6/4212 ,  G02B6/4246 ,  G02F1/0115

Abstract: An optical waveguide element that suppresses insertion loss related to coupling to an optical fiber or the like while miniaturizing the optical waveguide element is provided. There is provided an optical waveguide element including: a rib optical waveguide (10) that is made of a material (1) having an electro-optic effect; and the reinforcing substrate (2) that supports the optical waveguide, in which one end of the optical waveguide forms a tapered portion (11) of which a width narrows toward an end surface of the reinforcing substrate, a structure (3) made of a material having a higher refractive index than a material constituting the reinforcing substrate is provided so as to cover the tapered portion, and a coating layer (4) made of a material having a lower refractive index than the material constituting the structure is disposed so as to cover the structure.