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公开(公告)号：US12197052B2
公开(公告)日：2025-01-14
申请号：US17593931
申请日：2019-09-27
Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
Inventor： Yu Kataoka , Norikazu Miyazaki
Abstract: In order to provide an optical waveguide element that is capable of reducing coupling loss at a coupling portion with an optical fiber and of reducing propagation loss in an optical waveguide, the optical waveguide element comprises a supporting substrate and a waveguide layer consisting of a material having an electro-optic effect stacked on the supporting substrate, wherein a rib portion for forming an optical waveguide is provided protruding on an upper surface of the waveguide layer; a groove portion is formed on an upper surface of the supporting substrate directly below a part of the rib portion; and the groove portion is filled with a material having an effective refractive index comparable to that of the waveguide layer.
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公开(公告)号：US20220163720A1
公开(公告)日：2022-05-26
申请号：US17599721
申请日：2019-09-26
Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
Inventor： Yuki Kugimoto , Norikazu Miyazaki , Yu Kataoka
Abstract: In an optical waveguide element, performance deterioration due to recoupling of unnecessary light leaking from an optical waveguide with the optical waveguide is prevented. An optical waveguide element includes an optical substrate on which an optical waveguide is formed, and a support substrate that is bonded to the optical substrate, on a bonded surface of the support substrate bonded to the optical substrate, a recess portion along the optical waveguide on the optical substrate is formed directly under the optical waveguide, a portion of the support substrate from an upper surface of the support substrate to at least a depth of a bottom surface of the recess portion has a refractive index higher than a substrate refractive index of the optical substrate, and the recess portion is filled with a substance having a refractive index lower than the substrate refractive index.
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公开(公告)号：US12265310B2
公开(公告)日：2025-04-01
申请号：US17699595
申请日：2022-03-21
Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
Inventor： Yu Kataoka , Kosuke Okahashi
Abstract: An optical waveguide device includes a substrate, an optical waveguide formed on the substrate, two electrodes disposed at positions sandwiching the optical waveguide from both sides in a plane of the substrate; and a dielectric layer covering a top of the optical waveguide, wherein the dielectric layer extends in a width direction of the optical waveguide to an extent including edges of the two electrodes, facing the optical waveguide, and is disposed to partially cover each of the two electrodes.
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公开(公告)号：US12025833B2
公开(公告)日：2024-07-02
申请号：US17764950
申请日：2020-09-23
Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
Inventor： Yu Kataoka , Norikazu Miyazaki
CPC classification number: G02B6/125 , G02B2006/12097
Abstract: Provided is an optical waveguide element that prevents leaked light generated at a forking section from entering a downstream optical waveguide such as another forking section, thereby affording minimal degradation of optical characteristics. The optical waveguide is characterized in that: at least one of two fork waveguides (20a, 20b) forking from a first forking section (20) comprises a second forking section (21, 22); slab waveguides (3c-1 to 3c-3) are formed between the two fork waveguides; and between the first forking section and the second forking section, slits (41, 42) are formed that partition the slab waveguides into a first slab waveguide area (3c-1) close to the first forking section and second slab waveguide areas (3c-2, 3c-3) close to the second forking section(s).
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公开(公告)号：US11977284B2
公开(公告)日：2024-05-07
申请号：US17827022
申请日：2022-05-27
Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
Inventor： Masayuki Motoya , Shotaro Hirata , Kosuke Okahashi , Yu Kataoka , Shingo Takano
CPC classification number: G02F1/0356 , G02B6/12004 , G02B6/136 , G02F1/212 , G02F1/2255 , G02B2006/12126 , G02B2006/12142
Abstract: There is provided an optical waveguide device including: a substrate; an optical waveguide formed on the substrate; and a working electrode that controls a light wave propagating through the optical waveguide, in which the working electrode includes a first base layer made of a first material, a first conductive layer on the first base layer, a second base layer made of a second material different from the first material, which is on the first conductive layer, and a second conductive layer on the second base layer, and an edge of the second base layer is covered with the second conductive layer, in a cross-section perpendicular to an extending direction of the optical waveguide.
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Patent Agency Ranking
公开(公告)号：US11656487B2
公开(公告)日：2023-05-23
申请号：US17490590
申请日：2021-09-30
Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
Inventor： Yu Kataoka , Shingo Takano , Norikazu Miyazaki
IPC: G02F1/035
CPC classification number: G02F1/0353 , G02F2201/063
Abstract: An optical waveguide element includes a substrate and an optical waveguide that is disposed on the substrate. The optical waveguide has an effective refractive index change portion in which an effective refractive index of the optical waveguide related to a fundamental mode A parallel to a plane of polarization of a light wave propagated through the optical waveguide changes according to propagation of the light wave. In the effective refractive index change portion, a cross-sectional shape of the optical waveguide which is perpendicular to a propagation direction of the light wave is set such that the effective refractive index of the optical waveguide related to the fundamental mode A is higher than an effective refractive index of the optical waveguide related to another fundamental mode B perpendicular to the fundamental mode A.
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7.发明授权公开(公告)号：US12259631B2
公开(公告)日：2025-03-25
申请号：US17916400
申请日：2020-12-04
Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
Inventor： Norikazu Miyazaki , Yu Kataoka
Abstract: Provided is an optical control element that can minimize an optical path difference between branched waveguides while reducing a difference in structure between the branched waveguides by disposing an input portion and an output portion of an optical waveguide on the same side of a substrate on which the optical waveguide is formed. An optical control element includes a substrate 1 having an electro-optic effect, an optical waveguide 2 formed on the substrate, and a control electrode controlling a light wave propagating through the optical waveguide, in which an input portion (input light L1) and an output portion (output light L2) of the optical waveguide are formed on the same side of the substrate, the optical waveguide includes at least one Mach-Zehnder type optical waveguide portion (MZ) that has two branched waveguides (21, 22) branched from one optical waveguide and combines the two branched waveguides to form one optical waveguide, and the branched waveguides have an even number of turned-back potions (A1, A2).
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公开(公告)号：US20230367170A1
公开(公告)日：2023-11-16
申请号：US18246358
申请日：2021-09-28
Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
Inventor： Kenta Oishi , Yu Kataoka , Shingo Takano
CPC classification number: G02F1/2255 , G02F1/212
Abstract: An optical waveguide element includes: a substrate on which an optical waveguide is formed; and an electrode that is formed on the substrate and controls a light wave propagating through the optical waveguide. The optical waveguide includes a protruding portion extending on the substrate, and the electrode includes a base layer made of Nb, and an upper layer formed on the base layer, the base layer being formed between the substrate and the upper layer. The occurrence of loss in propagating light is effectively suppressed due to the existence of the electrode that controls the propagating light in the optical waveguide element using the protruding optical waveguide
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9.发明公开公开(公告)号：US20230367169A1
公开(公告)日：2023-11-16
申请号：US18246559
申请日：2022-03-04
Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
Inventor： Kosuke Okahashi , Yu Kataoka
Abstract: An optical waveguide device that can prevent fluctuations in electrical characteristics due to adhesion of foreign matter to electrodes without adversely affecting the degree of freedom in electrode design. The optical waveguide device includes a substrate, an optical waveguide formed on the substrate, an electrode for controlling a light wave propagating through the optical waveguide, and a first insulating layer disposed between two adjacent electrodes among the electrodes, in which the first insulating layer has a height from a surface of the substrate that is higher than heights of the two electrodes.
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公开(公告)号：US20220381977A1
公开(公告)日：2022-12-01
申请号：US17827022
申请日：2022-05-27
Applicant: SUMITOMO OSAKA CEMENT CO., LTD.
Inventor： Masayuki Motoya , Shotaro Hirata , Kosuke Okahashi , Yu Kataoka , Shingo Takano
Abstract: There is provided an optical waveguide device including: a substrate; an optical waveguide formed on the substrate; and a working electrode that controls a light wave propagating through the optical waveguide, in which the working electrode includes a first base layer made of a first material, a first conductive layer on the first base layer, a second base layer made of a second material different from the first material, which is on the first conductive layer, and a second conductive layer on the second base layer, and an edge of the second base layer is covered with the second conductive layer, in a cross-section perpendicular to an extending direction of the optical waveguide.
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