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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：US20250004347A1
公开(公告)日：2025-01-02
申请号：US18756651
申请日：2024-06-27
Applicant: TDK CORPORATION
Inventor： Hiroki HARA , Yasuhiro TAKAGI
Abstract: An electro-optical element of the present disclosure includes a substrate, and an optical function layer. The optical function layer has a light input port, an optical branching part in which a light input side optical waveguide guiding visible light input through the light input port is connected to the one optical waveguide for monitoring and two optical modulation optical waveguides, a Mach-Zehnder optical modulation part configured to modulate visible light guided by the two optical modulation optical waveguides, a 2×1 type optical coupling part configured to couple two beams of visible light modulated by the Mach-Zehnder optical modulation part, a light output side waveguide configured to guide light coupled by the optical coupling part to a light output port, the light output port, and a monitoring light output port.
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公开(公告)号：US20240329337A1
公开(公告)日：2024-10-03
申请号：US18618562
申请日：2024-03-27
Applicant: TDK CORPORATION
Inventor： Yasuhiro TAKAGI , Hiroki HARA , Atsushi SHIMURA
CPC classification number: G02B6/4214 , G02F1/035 , G02F1/212 , G02F2201/04
Abstract: A Y-branch type optical coupler includes an optical coupling part to which a plurality of input-side optical waveguides through which the plurality of lights propagate, and one output-side optical waveguide are connected, wherein the optical coupling part has an isosceles trapezoid shape of which the width is narrowed in a taper shape at a first angle α from the input side to the output side (a traveling direction of light) in a plan view, at least two input-side optical waveguides among the plurality of input-side optical waveguides are disposed symmetrically with respect to a symmetry axis of the isosceles trapezoid, are inclined at a second angle θ that is different from the first angle α, and are connected to a lower bottom portion of the isosceles trapezoid, and the difference between the first angle and the second angle is 0.9° or more and 14.8° or less.
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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：US20230040729A1
公开(公告)日：2023-02-09
申请号：US17789994
申请日：2021-03-22
Applicant: TDK CORPORATION
Inventor： Kenji ENDOU , Shinji IWATSUKA , Hiroki HARA
Abstract: An optical modulator includes a plurality of optical modulation units having a Mach-Zehnder type optical waveguide consisting of two optical waveguides and a high-frequency line pair arranged along the two optical waveguides and consisting of two signal electrodes for applying a pair of differential high-frequency signals, and a plurality of high-resistance conductive films are provided between adjacent high-frequency line pairs separated from the high-frequency line pair.
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Patent Agency Ranking
公开(公告)号：US20200310216A1
公开(公告)日：2020-10-01
申请号：US16832784
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 first waveguide section provided at least in an electric field application region applied with the electric field and having a thickness of 1 μm or larger and a second waveguide section provided in a region other than the electric field application region and having a thickness of 0.3 μm or larger and less than 1 μm.
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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：US20250013118A1
公开(公告)日：2025-01-09
申请号：US18738630
申请日：2024-06-10
Applicant: TDK CORPORATION
Inventor： Hiroki HARA , Yasuhiro Takagi
Abstract: An electro-optical element includes a substrate, and an optical functional layer formed on a main surface of the substrate, in which the optical functional layer includes an optical-input-side optical waveguide configured to guide light emitted from a light source, an optical branch part configured to branch the optical-input-side optical waveguide into two optical-modulation optical waveguides, a Mach-Zehnder optical modulation part configured to modulate light guided through the two optical-modulation optical waveguides, an optical coupling and branch part configured to branch the two optical-modulation optical waveguides configured to guide modulated light modulated by the Mach-Zehnder optical modulation part into one monitoring optical waveguide and a plurality of optical-output-side optical waveguides, and an optical coupling part configured to make the plurality of optical-output-side optical waveguides as one optical-output optical waveguide.
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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：US20240255828A1
公开(公告)日：2024-08-01
申请号：US18018387
申请日：2021-07-30
Applicant: TDK CORPORATION
Inventor： Takashi KIKUKAWA , Tsuyoshi KOMAKI , Hideaki FUKUZAWA , Hiroki HARA
CPC classification number: G02F1/2255 , G02F1/212 , G02F1/035
Abstract: A visible light modulation device includes a light source part having a plurality of optical semiconductor devices configured to emit light with a visible light wavelength of 400 nm to 700 nm, and a light modulation output part having three Mach-Zehnder type optical waveguides consisting of a convex fabricated lithium niobate film, and being configured so that light emitted from each of the plurality of optical semiconductor devices is incident on the corresponding Mach-Zehnder type optical waveguide.
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