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1.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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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：US20230228941A1
公开(公告)日：2023-07-20
申请号：US17924522
申请日：2021-08-19
Applicant: TDK CORPORATION
Inventor： Hiroki HARA , Takashi KIKUKAWA , Atsushi SHIMURA
IPC: G02B6/125
CPC classification number: G02B6/125 , G02B2006/12097
Abstract: An optical circuit element capable of preventing stray light propagated through a part including a substrate of the optical circuit element from being emitted to the outside is provided. The optical circuit element has a substrate, an optical waveguide layer that is formed on one surface of the substrate, and a protective layer that is overlaid on the optical waveguide layer. The optical waveguide layer has an optical waveguide configured for light to be propagated therethrough. A groove portion, which reaches to a position deeper than the one surface from a surface of the protective layer toward the substrate, is formed. The optical circuit element further includes a light absorption layer that covers at least a bottom surface and a side surface of the groove portion.
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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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5.发明申请公开(公告)号：US20250080227A1
公开(公告)日：2025-03-06
申请号：US18956578
申请日：2024-11-22
Applicant: TDK Corporation
Inventor： Hideaki FUKUZAWA , Takashi KIKUKAWA , Masahiro SHINKAI , Hiroki HARA
IPC: H04B10/50 , H04B10/116 , H04B10/516
Abstract: A transmission device of the present disclosure is a transmission device that transmits a visible light signal to a receiving device, and includes a laser light source configured to emit visible light, and an optical modulator configured to change intensity of the visible light and generate a visible light signal, in which the optical modulator has an optical waveguide that serves as a transmission path for the visible light, and the optical waveguide is formed of a material containing lithium niobate.
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Patent Agency Ranking
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：US20230069468A1
公开(公告)日：2023-03-02
申请号：US17797213
申请日：2021-01-20
Applicant: TDK Corporation
Inventor： Shinji Iwatsuka , Hiroki HARA , Anthony Reymund Melad BINARAO , Cheng Bu HENG , Hiroshi TAKE , Kenji NAGASE
IPC: G02F1/035
Abstract: An optical waveguide element includes: an optical waveguide having a ridge part and a slab part having a thickness less than the ridge part. The optical waveguide includes: a first waveguide having a first ridge with and a first slab film thickness; a second waveguide having a second ridge width and a second slab film thickness; a first intermediate waveguide connected to the first waveguide and having a third ridge width and the first slab film thickness; and a second intermediate waveguide connected to the second waveguide and having a fourth ridge width and the second slab film thickness. The first waveguide, the first intermediate waveguide, the second intermediate waveguide, and the second waveguide are arranged in this order; the second slab film thickness is larger than the first slab film thickness; and the third ridge width is larger than the fourth ridge width.
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公开(公告)号：US20230059850A1
公开(公告)日：2023-02-23
申请号：US17797199
申请日：2021-01-20
Applicant: TDK Corporation
Inventor： Shinji IWATSUKA , Kenji ENDOU , Hiroki HARA
Abstract: To provide an optical modulation element capable of suppressing electrode loss at a low frequency of 50 GHz or less, and suppressing radiation loss at a high frequency of 50 GHz or more. An optical modulation element comprises: a substrate; and at least one interaction part provided on the substrate. The interaction part includes: first and second optical waveguides formed adjacent to each other on the substrate; and first and second signal electrodes provided so as to oppose the first and second optical waveguides respectively. o ground electrode is provided in a nearby region of the interaction part, and a ground electrode is provided in the vicinity of at least one of an input part and a terminal part electrically connected to each of the first and second signal electrodes.
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公开(公告)号：US20220382118A1
公开(公告)日：2022-12-01
申请号：US17773780
申请日：2020-10-26
Applicant: TDK Corporation
Inventor： Hiroki HARA , Shinji IWATSUKA
Abstract: To prevent deterioration in an extinction ratio due to asymmetry between a pair of optical waveguides.
An optical modulator has a Mach-Zehnder optical waveguide including mutually parallel first and second waveguides and a signal electrode for controlling the phase of light propagating in the Mach-Zehnder optical waveguide. The first and second waveguides have a first section in which the second waveguide has a line width smaller than that of the first waveguide and a second section in which the first waveguide has a line width smaller than that of the second waveguide. The first section and the second section are replaced with each other in curved parts.-
公开(公告)号：US20210103165A1
公开(公告)日：2021-04-08
申请号：US16832647
申请日：2020-03-27
Applicant: TDK Corporation , FUJITSU OPTICAL COMPONENTS LIMITED
Inventor： Shinji IWATSUKA , Kenji SASAKI , Hiroki HARA , Yasuhiro OHMORI , Masaharu DOI , Shintaro TAKEUCHI , Yoshihiko YOSHIDA , Yoshinobu KUBOTA
Abstract: An electro-optic device is provided with a substrate, an optical waveguide formed of a lithium niobate film with a ridge shape on the substrate, and an electrode that applies an electric field to the optical waveguide. The optical waveguide includes a modulation waveguide provided in an electric field application region applied with the electric field and having a thickness of 1 μm or larger and a bent waveguide provided in a region other than the electric field application region and having a curvature radius of 16 μm or larger and 80 μm or smaller.
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