公开(公告)号：US12282191B2

公开(公告)日：2025-04-22

申请号：US17924522

申请日：2021-08-19

Applicant: TDK CORPORATION

Inventor： Hiroki Hara ,  Takashi Kikukawa ,  Atsushi Shimura

IPC: G02B6/125 ,  G02B6/12

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.

公开(公告)号：US12248205B2

公开(公告)日：2025-03-11

申请号：US17924517

申请日：2021-07-13

Applicant: TDK CORPORATION

Inventor： Hajime Utsunomiya ,  Takashi Kikukawa

IPC: G02F1/035 ,  G02F1/21 ,  G02F1/225

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.

公开(公告)号：US20200271963A1

公开(公告)日：2020-08-27

申请号：US16799753

申请日：2020-02-24

Applicant: TDK Corporation ,  FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Shinji Iwatsuka ,  Kenji Endou ,  Hiroki Hara ,  Toshinori Matsuura ,  Takashi Kikukawa ,  Yasuhiro Ohmori ,  Masaharu Doi ,  Shintaro Takeuchi ,  Takehito Tanaka ,  Yoshinobu Kubota

IPC: G02F1/03 ,  G02F1/225

Abstract: An optical modulator is provided with a substrate, first and second optical waveguides each formed of a ridge-shaped electro-optic material film and disposed so as to be mutually adjacent on the substrate, a buffer layer covering upper surfaces of the first and second optical waveguides, first and second signal electrodes provided above the buffer layer so as to be opposed respectively to the first and second optical waveguides, and a dielectric layer covering at least one of a part of an exposed surface of the first signal electrode and a part of an exposed surface of the second signal electrode, and a part of an upper surface of the buffer layer. Differential signals are applied to the first and second signal electrodes.

公开(公告)号：US10921522B2

公开(公告)日：2021-02-16

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

IPC: G02B6/26 ,  G02B6/42

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 D1; and the two holding members are equal in thermal expansion coefficient.

公开(公告)号：US10799863B2

公开(公告)日：2020-10-13

申请号：US16087794

申请日：2017-03-24

Applicant: TDK CORPORATION

Inventor： Sachio Tsuboike ,  Susumu Haratani ,  Sumiko Kitagawa ,  Takashi Kikukawa ,  Haruki Yuga

IPC: G01N33/44 ,  B01L3/00 ,  B82Y25/00 ,  G01N15/06 ,  G01N27/72 ,  G01N27/74 ,  G01R33/09 ,  G01R33/12 ,  C12Q1/6825 ,  G01N33/543 ,  G01N27/00 ,  G01N15/00

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.

公开(公告)号：US11722222B2

公开(公告)日：2023-08-08

申请号：US17507143

申请日：2021-10-21

Applicant: TDK CORPORATION

Inventor： Hideaki Fukuzawa ,  Tomohito Mizuno ,  Tetsuya Shibata ,  Takashi Kikukawa

IPC: H04B10/40 ,  H04B10/50 ,  H04B10/532

CPC classification number: H04B10/503 ,  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.

公开(公告)号：US11003044B2

公开(公告)日：2021-05-11

申请号：US16799770

申请日：2020-02-24

Applicant: TDK Corporation ,  FUJITSU OPTICAL COMPONENTS LIMITED

Inventor： Hiroki Hara ,  Shinji Iwatsuka ,  Takashi Kikukawa ,  Toshinori Matsuura ,  Yasuhiro Ohmori ,  Masaharu Doi ,  Shintaro Takeuchi ,  Yoshinobu Kubota

IPC: G02F1/225 ,  G02F1/035 ,  G02F1/21

Abstract: An electro-optic device is provided with a Mach-Zehnder optical waveguide including at least one linear section and at least one curved section and a differential RF signal electrode provided along the Mach-Zehnder optical waveguide. Optical input/output ports of the Mach-Zehnder optical waveguide are provided at one end side in a first direction in which the linear section extends. The differential RF signal electrode is provided in both the linear and curved sections.

公开(公告)号：US11003043B2

公开(公告)日：2021-05-11

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

IPC: G02F1/225 ,  G02F1/03 ,  G02F1/21

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.

公开(公告)号：US10948395B2

公开(公告)日：2021-03-16

申请号：US16089122

申请日：2017-03-24

Applicant: TDK CORPORATION

Inventor： Susumu Haratani ,  Sachio Tsuboike ,  Sumiko Kitagawa ,  Takashi Kikukawa ,  Haruki Yuga

IPC: G01N15/06 ,  G01N33/543 ,  G01N27/74 ,  G01N15/00

Abstract: What provided is a biosensor including: a substrate having a surface with first and second regions adjacent each other; a magnetoresistance effect element disposed on the first region; a soft magnetic thin film on the second region; a protective film disposed on both the first region and the second region, covering a surface of the soft magnetic thin film, and disposed on the top part of the second region and contains an affinity substance recognizing the biomolecule on the outer surface of the second region exclusively; and an MR cover film disposed on at least the top part of the first region, disposed on the protective film above the magnetoresistance effect element, and being free of the affinity substance, wherein the soft magnetic thin film transmits an in-plane component of a stray magnetic field of magnetic beads to the magnetoresistance effect element.

公开(公告)号：US10801993B2

公开(公告)日：2020-10-13

申请号：US16087833

申请日：2017-03-24

Applicant: TDK CORPORATION

Inventor： Sachio Tsuboike ,  Susumu Haratani ,  Sumiko Kitagawa ,  Takashi Kikukawa ,  Haruki Yuga

IPC: G01N27/72 ,  C12Q1/6816 ,  G01N27/74 ,  C12Q1/6825 ,  G01N33/543

Abstract: A chemical sensor that enables high detection accuracy that includes a soft-magnetic-material film, a magnetoresistance-effect element, a first film disposed over the soft-magnetic-material film, and a second film disposed over the magnetoresistance-effect element, wherein, when viewed from a direction perpendicular to the film surface of the soft-magnetic-material film, the soft-magnetic-material film is disposed at least partially so as not to overlap the magnetoresistance-effect element; when viewed from the direction perpendicular to the film surface of the soft-magnetic-material film, the magnetoresistance-effect element is disposed at least partially so as not to overlap the soft-magnetic-material film; and the second film has higher solubility in a specific liquid than the first film.