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1.发明申请公开(公告)号：US20250028194A1
公开(公告)日：2025-01-23
申请号：US18736684
申请日：2024-06-07
Applicant: TDK CORPORATION
Inventor： Shusaku UMEMOTO , Kenji SASAKI , Takashi KIKUKAWA
IPC: G02F1/035
Abstract: A substrate with a dielectric thin film 1 includes a single-crystal substrate, a stress relaxation layer, and a dielectric thin film, in which the stress relaxation layer is made of a c-axis-oriented epitaxial film, and includes a twin crystal structure of LiNbO3 including a first and a second crystal existing at a position obtained by rotating the first crystal 180° about a c-axis and a LiNb3O8 phase, the dielectric thin film is made of a lithium niobate film which is a c-axis-oriented epitaxial film, has the twin crystal structure of LiNbO3, has a film thickness of 0.5 μm to 2 μm, and has a maximum domain width greater than a maximum domain width of the stress relaxation layer, and a percentage of a film thickness of the stress relaxation layer to the film thickness of the dielectric thin film is 5% to 25%.
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公开(公告)号：US20240126015A1
公开(公告)日：2024-04-18
申请号：US18377602
申请日：2023-10-06
Applicant: TDK CORPORATION
Inventor： Hajime UTSUNOMIYA , Yasuhiro TAKAGI , Hiroki HARA , Atsushi SHIMURA , Jiro YOSHINARI , Takashi KIKUKAWA , Tsuyoshi KOMAKI , Hideaki FUKUZAWA
IPC: G02B6/293
CPC classification number: G02B6/29344
Abstract: This optical coupler for coupling a plurality of visible light beams having different wavelengths includes: a substrate made of a material different from lithium niobate; and an optical coupling function layer formed on a main surface of the substrate. The optical coupling function layer includes: two multimode-interference-type optical coupling parts; optical-input-side waveguides and an optical-output-side waveguide connected to one multimode-interference-type optical coupling part, and optical-input-side waveguides and an optical-output-side waveguide connected to the other multimode-interference-type optical coupling part. The multimode-interference-type optical coupling parts, the optical-input-side waveguides, and the optical-output-side waveguides are made of a lithium niobate film.
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公开(公告)号：US20230327773A1
公开(公告)日：2023-10-12
申请号：US18210333
申请日：2023-06-15
Applicant: TDK CORPORATION
Inventor： Hideaki FUKUZAWA , Tomohito MIZUNO , Tetsuya SHIBATA , Takashi KIKUKAWA
IPC: H04B10/50 , H04B10/532 , H04B10/40
CPC classification number: H04B10/503 , H04B10/532 , H04B10/40
Abstract: A transceiver device includes: a receiving device including a magnetic element having a first ferromagnetic layer, a second ferromagnetic layer, and a spacer layer sandwiched between the first ferromagnetic layer and the second ferromagnetic layer, wherein the receiving device is configured to receive an optical signal; a transmission device including a modulated light output element, wherein the transmission device is configured to transmit an optical signal; and a circuit chip including an integrated circuit electrically connected to the magnetic element and the modulated light output element.
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公开(公告)号：US20200272020A1
公开(公告)日：2020-08-27
申请号：US16799763
申请日：2020-02-24
Applicant: FUJITSU OPTICAL COMPONENTS LIMITED , TDK Corporation
Inventor： Yasuhiro OHMORI , Masaharu DOI , Shintaro TAKEUCHI , Takehito TANAKA , Yoshinobu KUBOTA , Shinji IWATSUKA , Kenji ENDOU , Hiroki HARA , Toshinori MATSUURA , Takashi KIKUKAWA
Abstract: An optical modulator is provided with a ridge-shaped optical waveguide formed of a dielectric thin film having electro-optic effect, a buffer layer covering the optical waveguide, a signal electrode formed on the buffer layer so as to be opposed to the optical waveguide through the buffer layer; a ground electrode formed on the buffer layer together with the signal electrode, and a dielectric film having a higher dielectric constant than air and covering at least a part of exposed surfaces of the signal electrode and ground electrode and exposed surfaces of the buffer layer.
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公开(公告)号：US20230229056A1
公开(公告)日：2023-07-20
申请号：US18097881
申请日：2023-01-17
Applicant: TDK CORPORATION
Inventor： Hideaki FUKUZAWA , Joji OKADA , Takashi KIKUKAWA , Tsuyoshi KOMAKI
CPC classification number: G02F1/212 , G02B27/0172 , G02F1/035 , G02F1/0123 , H04B10/505 , G02B2027/0178
Abstract: A light source unit (1000) of the present disclosure includes a light source part (100), a first electrical signal generating device (40-1) configured to control current that drives an optical semiconductor device (30), an optical modulator (200) having a Mach-Zehnder type optical waveguide (10) and an electrode configured to apply an electric field to the optical waveguide (10), and a second electrical signal generating device (40-2) configured to control a voltage that operates the optical modulator (200), the first electrical signal generating device (40-1) and the second electrical signal generating device (40-2) are synchronizably connected to each other, and intensity of light emitted from the optical modulator (200) is changed by the current controlled by the first electrical signal generating device (40-1) and the voltage controlled by the second electrical signal generating device (40-2).
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Patent Agency Ranking
公开(公告)号：US20190224671A1
公开(公告)日：2019-07-25
申请号：US16088988
申请日：2017-03-24
Applicant: TDK CORPORATION
Inventor： Susumu HARATANI , Sachio TSUBOIKE , Sumiko KITAGAWA , Takashi KIKUKAWA , Haruki YUGA
IPC: B01L3/00 , C12Q1/6825 , G01N27/00
Abstract: A biosensor includes a substrate having a surface in which a first region and a second region disposed adjacent to the first region are formed; a magnetoresistance effect element that is disposed on at least the first region and is configured such that a resistance value detected according to an input magnetic field varies; a protective film that is disposed on both the first region and the second region and covers a surface of the magnetoresistance effect element, and is disposed on the top part of the second region and contains an affinity substance that allows recognition of the biomolecules on the outer surface only on the second region; and an adsorption prevention film that is disposed on at least the top part of the first region and is substantially free of the affinity substance, wherein the protective film and the adsorption prevention film are made of different materials.
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公开(公告)号：US20190113479A1
公开(公告)日：2019-04-18
申请号：US16087836
申请日：2017-03-24
Applicant: TDK CORPORATION
Inventor： Sachio TSUBOIKE , Susumu HARATANI , Sumiko KITAGAWA , Takashi KIKUKAWA , Haruki YUGA
IPC: G01N27/72 , G01N33/543 , C12Q1/6825
Abstract: To provide a chemical sensor that enables high detection accuracy. A chemical sensor includes a substrate, two or more magnetoresistance-effect elements disposed side by side in a substrate in-plane direction over the substrate, a first film disposed over a region between the magnetoresistance-effect elements adjacent to each other, and a second film disposed over the magnetoresistance-effect elements, wherein the second film has higher solubility in a specific liquid than the first film.
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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：US20230213791A1
公开(公告)日：2023-07-06
申请号：US17928386
申请日：2021-06-18
Applicant: TDK CORPORATION
Inventor： Hajime UTSUNOMIYA , Takashi KIKUKAWA
CPC classification number: G02F1/035 , G02F1/0123
Abstract: The optical modulator includes an optical modulation element having a first optical waveguide, a second optical waveguide, a first electrode which applies an electric field to the first optical waveguide, and a second electrode which applies an electric field to the second optical waveguide, and a control unit configured to control an applied voltage between the first electrode and the second electrode. When a half-wave voltage of the optical modulation element is Vπ and a null point voltage of the optical modulation element is Vn, the control unit sets an operating point Vd in a range of Vn+0.50Vπ≤Vd≤Vn+0.75Vπ or Vn−0.75Vπ≤Vd≤Vn−0.50Vπ and sets an applied voltage width Vpp, which is an amplitude of an applied voltage applied to the optical modulation element, in a range of 0.22Vπ≤Vpp≤0.50Vπ.
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公开(公告)号：US20220131612A1
公开(公告)日：2022-04-28
申请号：US17507143
申请日：2021-10-21
Applicant: TDK CORPORATION
Inventor： Hideaki FUKUZAWA , Tomohito MIZUNO , Tetsuya SHIBATA , Takashi KIKUKAWA
IPC: H04B10/50 , H04B10/40 , H04B10/532
Abstract: A transceiver device includes: a receiving device including a magnetic element having a first ferromagnetic layer, a second ferromagnetic layer, and a spacer layer sandwiched between the first ferromagnetic layer and the second ferromagnetic layer, wherein the receiving device is configured to receive an optical signal; a transmission device including a modulated light output element, wherein the transmission device is configured to transmit an optical signal; and a circuit chip including an integrated circuit electrically connected to the magnetic element and the modulated light output element.
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