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公开(公告)号：US20250138349A1
公开(公告)日：2025-05-01
申请号：US18883037
申请日：2024-09-12
Applicant: TDK Corporation
Inventor： Yasuhiro TAKAGI , Hiroki Hara , Atsushi Shimura , Jiro Yoshinari
Abstract: A core layer of an optical element includes a second conversion portion that converts a polarization mode of light from a TE1 mode to a TE0 mode. The second conversion portion includes: a splitting portion that splits the light in the TE1 mode incident from the first conversion portion into first split light in the TE0 mode and second split light in the TE0 mode which are in opposite phases; a coupling portion that couples the first split light that has propagated through a first branch waveguide and the second split light that has propagated through a second branch waveguide to emit the light in the TE0 mode; and a phase adjustment unit that adjusts a phase difference between the first split light and the second split light. The first branch waveguide and the second branch waveguide are arranged in a second direction.
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公开(公告)号：US20240295701A1
公开(公告)日：2024-09-05
申请号：US18589472
申请日：2024-02-28
Applicant: TDK Corporation
Inventor： Yasuhiro TAKAGI , Hiroki HARA , Atsushi SHIMURA
CPC classification number: G02B6/29344 , G02B6/4215 , G02B26/105
Abstract: An optical coupler of the present invention is an optical coupler that couples laser lights of three different wavelengths, and includes a two-stage MMI type optical coupler in which a first MMI type optical coupling part and a second MMI type optical coupling part are connected from the input side, and the width of the first MMI type optical coupling part is wider than the width of the second MMI type optical coupling part.
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公开(公告)号：US20240329437A1
公开(公告)日：2024-10-03
申请号：US18409030
申请日：2024-01-10
Applicant: TDK CORPORATION
Inventor： Hiroki HARA , Yasuhiro TAKAGI , Atsushi SHIMURA , Jiro YOSHINARI
CPC classification number: G02F1/035 , G02B27/0172 , G02F1/0316 , G02F1/212 , G02F1/225 , G02B2027/0178
Abstract: An optical modulator is a Mach-Zehnder-type optical modulator having a substrate and an optical waveguide layer including a lithium niobate film formed on the substrate. The optical waveguide layer includes a plurality of flat portions and n ridge portions arranged between the flat portions to be adjacent, where n is two or more. Each of the n ridge portions includes a main waveguide to which visible light is input, a first multimode interference waveguide through which the main waveguide is branched into a first and a second optical branch waveguide, and a second multimode interference waveguide through which the first and the second optical branch waveguide are coupled to form a coupling waveguide. Visible light beams having different wavelengths are input to the n ridge portions. The first multimode interference waveguide and the second multimode interference waveguide have shorter lengths when input light having a longer wavelength is transmitted.
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公开(公告)号：US20200295397A1
公开(公告)日：2020-09-17
申请号：US16810216
申请日：2020-03-05
Applicant: TDK CORPORATION
Inventor： Satoru HIRAKAWA , Yasuhiro TAKAGI , Tohru INOUE
IPC: H01M10/0525 , H01M2/16 , H01M4/134
Abstract: Disclosed herein is a lithium secondary battery that includes an electrode assembly having a weight energy density of 250 Wh/Kg or more, and a heat exhaust layer provided on a surface of the electrode assembly. The electrode assembly has a structure in which a positive electrode and a negative electrode are alternately stacked through a separator. The positive electrode includes a positive electrode current collector and a positive electrode active material layer formed on a surface of the positive electrode current collector. The negative electrode including a negative electrode current collector and a negative electrode active material layer formed on a surface of the negative electrode current collector.
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公开(公告)号：US20250138330A1
公开(公告)日：2025-05-01
申请号：US18883273
申请日：2024-09-12
Applicant: TDK Corporation
Inventor： Atsushi SHIMURA , Yasuhiro TAKAGI , Hiroki HARA
Abstract: An optical element includes a mode converter that converts a polarization mode of visible light. The mode converter includes a conversion unit that converts a polarization mode of the visible light from a TM0 mode to a TE1 mode, and a splitting unit that splits the visible light in the TE1 mode into a first split light in the TE0 mode and a second split light in the TE0 mode, and adjusts a phase difference between the first split light and the second split light. The splitting unit includes a first branch wave guide through which the first split light propagates and a second branch wave guide through which the second split light propagates. An optical path length of the first split light in the first branch wave guide and an optical path length of the second split light in the second branch wave guide are different from each other.
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Patent Agency Ranking
6.发明申请公开(公告)号：US20250004349A1
公开(公告)日：2025-01-02
申请号：US18754296
申请日：2024-06-26
Applicant: TDK CORPORATION
Inventor： Yasuhiro TAKAGI , Makoto Fukuda , Takeshi Kamono
Abstract: An optical coupler of the present disclosure includes a plurality of one-input multiple-output multimode interference input parts provided for each laser beam of the plurality of laser light beams. The optical coupler further includes one light output port configured to allow three laser light beams to be coupled and emitted therethrough, a plurality of light input side optical waveguides configured to extend from each of the plurality of one-input multiple-output multimode interference input parts, a light output side optical waveguide configured to extend from the light output port, and an optical coupling part configured to have the plurality of light input side optical waveguides and the light output side optical waveguide connected thereto.
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公开(公告)号：US20240329315A1
公开(公告)日：2024-10-03
申请号：US18617839
申请日：2024-03-27
Applicant: TDK Corporation
Inventor： Yasuhiro TAKAGI , Hiroki HARA , Atsushi SHIMURA
CPC classification number: G02B6/29344 , G02B26/105
Abstract: The optical coupler is a multimode interference type optical coupler that couples a plurality of laser lights of different wavelengths. The optical coupler includes an optical coupling main body, two input taper portions which are tapered input ports that are disposed on the input side of the optical coupling main body and of which the width of each becomes narrower as it is away from a connection end with the optical coupling main body, and one output taper portion which is a tapered output port that is disposed on the output side of the optical coupling main body and of which the width becomes narrower as it is away from a connection end with the optical coupling main body.
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公开(公告)号：US20240219642A1
公开(公告)日：2024-07-04
申请号：US18539873
申请日：2023-12-14
Applicant: TDK CORPORATION
Inventor： Yasuhiro TAKAGI , Hiroki Hara , Atsushi Shimura , Hajime Utsunomiya , Jiro Yoshinari
IPC: G02B6/293
CPC classification number: G02B6/29344
Abstract: An optical coupler includes: light input ports on a first side surface; monitoring light output ports on a second side surface; one light output port on a third side surface; and multimode-interference-type optical coupling parts, a first multimode-interference coupling part is connected to a first light-input-side waveguide on the input side, and to a first monitoring-light-output-side waveguide and a first connecting waveguide on the output side, the second multimode-interference coupling part is connected to a second light-input-side waveguide and the first connecting waveguide on the input side, and to a second monitoring-light-output-side waveguide and a second connecting waveguide on the output side, and the third multimode-interference coupling part is connected to a third light-input-side waveguide and the second connecting waveguide on the input side, and connected to a third monitoring-light-output-side waveguide and a light-output-port-connected waveguide on the output side, and the monitoring-light-output-side waveguides are free of an intersection.
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9.发明申请公开(公告)号：US20250004212A1
公开(公告)日：2025-01-02
申请号：US18754285
申请日：2024-06-26
Applicant: TDK CORPORATION
Inventor： Yasuhiro TAKAGI , Makoto Fukuda
Abstract: An optical coupler of the present disclosure includes three light input ports configured to allow a plurality of laser light beams having different wavelengths to be respectively incident therethrough, two light output ports configured to allow three laser light beams to be coupled and emitted therethrough, three light input side optical waveguides configured to respectively extend from the three light input ports, two light output side optical waveguides configured to respectively extend from the two light output ports, and an optical coupling part configured to have the three light input side optical waveguides and the two light output side optical waveguides to be connected thereto.
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10.发明公开公开(公告)号：US20240329323A1
公开(公告)日：2024-10-03
申请号：US18429669
申请日：2024-02-01
Applicant: TDK CORPORATION
Inventor： Atsushi SHIMURA , Yasuhiro TAKAGI , Hiroki HARA , Jiro YOSHINARI
Abstract: This optical coupler includes a plurality of light input ports to which a plurality of visible light beams can be input, a light output port capable of coupling all of the plurality of visible light beams and outputting coupled light, an optical coupling portion to which a light-input-side optical waveguide and a light-output-side optical waveguide are connected, and at least one high-order mode removal portion provided to remove a high mode with respect to each of the plurality of visible light beams. The optical coupling portion and each high-order mode removal portion are arranged so that each of the plurality of visible light beams passes through only a high-order mode removal portion for visible light or passes through only the high-order mode removal portion for the visible light and a high-order mode removal portion for visible light having a shorter wavelength than the visible light.
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