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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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13.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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公开(公告)号：US20230229030A1
公开(公告)日：2023-07-20
申请号：US17924533
申请日：2021-07-13
Applicant: TDK CORPORATION
Inventor： Hajime UTSUNOMIYA , Takashi KIKUKAWA
CPC classification number: G02F1/035 , G02F1/212 , G02F1/225 , G02F2202/20
Abstract: This optical modulator includes an optical modulation element having a first optical waveguide, a second optical waveguide, a first electrode configured to apply an electric field to the first optical waveguide, and a second electrode configured to apply 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. The control unit sets Vpp to 0.06×Vπ≤Vpp≤0.4×Vπ when a half-wavelength voltage of the optical modulation element is Vπ and an applied voltage width that is an amplitude of an applied voltage applied to the optical modulation element is Vpp, and sets Vn≤Vmin≤Vn+0.29×Vπ or Vn−0.29×Vπ≤Vmax≤Vn when a minimum value and a maximum value of a voltage applied to the optical modulation element are respectively Vmin and Vmax and a null point voltage of the optical modulation element is Vn.
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公开(公告)号：US20230176403A1
公开(公告)日：2023-06-08
申请号：US17924517
申请日：2021-07-13
Applicant: TDK CORPORATION
Inventor： Hajime UTSUNOMIYA , Takashi KIKUKAWA
CPC classification number: G02F1/035 , G02F1/212 , G02F1/225 , G02F2202/20 , G02F2203/50
Abstract: This optical modulation element includes a first optical waveguide, a second optical waveguide, a first electrode for applying an electric field to the first optical waveguide, and a second electrode for applying an electric field to the second optical waveguide. The first optical waveguide and the second optical waveguide each include a ridge-shaped portion protruding from a first surface of a lithium niobate film. A first interaction length L1 that is a length of a part of the first electrode overlapping the first optical waveguide in a longitudinal direction is 0.9 mm or more and 20 mm or less. A second interaction length L2 that is a length of a part of the second electrode overlapping the second optical waveguide in the longitudinal direction is 0.9 mm or more and 20 mm or less.
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Patent Agency Ranking
公开(公告)号：US20220317484A1
公开(公告)日：2022-10-06
申请号：US17694917
申请日：2022-03-15
Applicant: TDK CORPORATION
Inventor： Tetsuya SHIBATA , Hideaki FUKUZAWA , Takashi KIKUKAWA , Tomohito MIZUNO
Abstract: An optical device that includes at least one magnetic element including a first ferromagnetic layer, a second ferromagnetic layer, and a spacer layer sandwiched between the first ferromagnetic layer and the second ferromagnetic layer; a substrate; and a waveguide is provided, wherein the waveguide and the magnetic element are located on or above the substrate, and wherein at least some of light propagating in the waveguide is applied to the magnetic element.
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公开(公告)号：US20200049888A1
公开(公告)日：2020-02-13
申请号：US16497001
申请日：2018-02-20
Applicant: TDK Corporation
Inventor： Hiroki HARA , Masahiro SHINKAI , Takashi KIKUKAWA , Masami SASAKI , Ryohei FUKUZAKI , Motohiro NAKAHARA , Tetsuo MIYA , Shuji TACHI , Koichi ARISHIMA
Abstract: A first disclosure is an optical fiber member equipped with two holding members that hold an optical fiber such that an end surface of the optical fiber is located on one end and a curving portion having a coat of the optical fiber is curved to be extended at another end; the holding members are provided with holding flat portions that sandwich an end portion of the optical fiber where the coat is removed such that the end surface of the optical fiber is located on the one end; at least any of the holding flat portions has an aligning groove to fix a position of the end portion of the optical fiber; the holding member is provided with a curved surface at a position adjacent to the curving portion in the extending direction Dl; and the two holding members are equal in thermal expansion coefficient.
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公开(公告)号：US20190154676A1
公开(公告)日：2019-05-23
申请号：US15752210
申请日：2016-07-22
Applicant: TDK CORPORATION
Inventor： Haruki YUGA , Seigo ZAIMA , Takashi KIKUKAWA , Sachio TSUBOIKE
IPC: G01N33/543
Abstract: A detection system includes a detection device including a space, defined by a wall surface, into which a liquid containing a biomolecular label and a liquid containing magnetic beads are introduced and a magnetic sensor having a surface forming a portion of the wall surface, wherein at least some of the magnetic beads bind to the biomolecular label immobilized on the surface of the magnetic sensor or to a molecule near the biomolecular label immobilized on the surface of the magnetic sensor; and a first magnetic-field applying mechanism that applies a magnetic field in a direction in which the magnetic beads are moved away from the surface of the magnetic sensor.
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公开(公告)号：US20190128882A1
公开(公告)日：2019-05-02
申请号：US16089007
申请日：2017-03-24
Applicant: TDK CORPORATION
Inventor： Susumu HARATANI , Sachio TSUBOIKE , Sumiko KITAGAWA , Takashi KIKUKAWA , Haruki YUGA
IPC: G01N33/543 , G01N27/74
Abstract: What provided is a biosensor including: a substrate having a surface with first and second regions adjacent to each other; a magnetoresistance effect element that is disposed at least on the first region and is configured for a detected resistance value to be changed based on an input magnetic field; a protective film that is disposed on both the first region and the second region, covers a surface of the magnetoresistance effect element, is disposed on the top part of the first region and contains an affinity substance capable of recognizing the biomolecule on the outer surface of the first region exclusively; and an adsorption prevention film that is disposed on at least the top part of the second 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：US20190107512A1
公开(公告)日：2019-04-11
申请号：US16087794
申请日：2017-03-24
Applicant: TDK CORPORATION
Inventor： Sachio TSUBOIKE , Susumu HARATANI , Sumiko KITAGAWA , Takashi KIKUKAWA , Haruki YUGA
Abstract: A chemical sensor that enables high detection accuracy. A chemical sensor includes a substrate, a magnetoresistance-effect element disposed over the substrate, a first film disposed over the magnetoresistance-effect element, and a second film disposed in a region in the vicinity of the magnetoresistance-effect element or over a region in the vicinity of the magnetoresistance-effect element, wherein the second film has higher solubility in a specific liquid than the first film.
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