Patents by Inventor Masaharu Doi
Masaharu Doi has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11693291Abstract: An optical waveguide device has a substrate, an intermediate layer, a thin-film LN layer containing an X-cut lithium niobate, and a buffer layer stacked on the substrate, and an optical waveguide having a ridge shape formed in the thin-film LN layer. The optical waveguide device includes a plurality of electrodes provided, respectively, at a first side and a second side of the optical waveguide. The electrodes are disposed so that respective bottom surfaces thereof are at positions lower than a position of a surface of the buffer layer.Type: GrantFiled: February 8, 2021Date of Patent: July 4, 2023Assignee: Fujitsu Optical Components LimitedInventors: Shuntaro Makino, Yoshinobu Kubota, Yasuhiro Ohmori, Masaharu Doi, Shintaro Takeuchi
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Patent number: 11693290Abstract: An optical waveguide device includes a substrate on which an intermediate layer, a thin-film LN layer of lithium niobate, and a buffer layer are stacked; an optical waveguide formed in the thin-film LN layer; and a plurality of electrodes near the optical waveguide. The intermediate layer and the buffer layer contain a same material of a metal element of any one of group 3 of group 18 of a periodic table of elements.Type: GrantFiled: February 2, 2021Date of Patent: July 4, 2023Assignee: Fujitsu Optical Components LimitedInventors: Shuntaro Makino, Yoshinobu Kubota, Yasuhiro Ohmori, Masaharu Doi, Teruo Kurahashi, Shintaro Takeuchi
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Patent number: 11623663Abstract: According to one embodiment, a transport service method comprises organizing a vehicle group of a plurality of self-driving vehicles in which a parameter value inherent to vehicles falls within a predetermined range, and controlling cooperative travel of the self-driving vehicles in the vehicle group to perform transport service of baggage, persons, animals, and the like.Type: GrantFiled: June 5, 2020Date of Patent: April 11, 2023Assignee: TOSHIBA DIGITAL SOLUTIONS CORPORATIONInventors: Megumi Kobayashi, Yasuto Hatafuku, Masahiro Samejima, Hideki Kubo, Motokazu Iwasaki, Yoko Ikeda, Shinsuke Iuchi, Kiyoshi Takemoto, Keishi Higashi, Kaori Kitami, Masaharu Doi, Tatsuki Shiraishi, Keiji Ogata, Yoshiki Yamaoka, Masaru Watabiki, Takeshi Nagai, Masao Uozumi, Masatomo Saito, Michiyo Sato, Masanori Takahashi
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Patent number: 11624965Abstract: An optical waveguide device includes an intermediate layer, a thin-film LN layer including X-cut lithium niobate, and a buffer layer stacked on a substrate; an optical waveguide formed in the thin-film LN layer; and an electrode for driving. The intermediate layer is formed by an upper first intermediate layer and a lower second intermediate layer, the second intermediate layer having a permittivity that is smaller than a permittivity of the first intermediate layer.Type: GrantFiled: June 17, 2021Date of Patent: April 11, 2023Assignee: FUJITSU OPTICAL COMPONENTS LIMITEDInventors: Shuntaro Makino, Yoshinobu Kubota, Yasuhiro Ohmori, Masaharu Doi, Teruo Kurahashi
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Publication number: 20230004028Abstract: An optical device includes a thin film Lithium Niobate (LN) layer, a first optical waveguide, and a second optical waveguide. The thin film LN layer is an X-cut or a Y-cut LN layer. The first optical waveguide is an optical waveguide that is formed on the thin film LN layer along a direction that is substantially perpendicular to a Z direction of a crystal axis of the thin film LN layer. The second optical waveguide is an optical waveguide that is routed and connected to the first optical waveguide. At least a part of a core of the first optical waveguide is made thicker than a core of the second optical waveguide.Type: ApplicationFiled: April 21, 2022Publication date: January 5, 2023Applicant: FUJITSU OPTICAL COMPONENTS LIMITEDInventors: Shuntaro MAKINO, Yoshinobu KUBOTA, Yasuhiro OHMORI, Masaharu DOI, Masaki SUGIYAMA, Shintaro TAKEUCHI, Yoshihiko YOSHIDA, Shinji MARUYAMA, Teruo KURAHASHI
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Publication number: 20220390775Abstract: An optical device includes an X-cut substrate, and a first waveguide and a second waveguide each being formed on the substrate and having a folding structure. The optical device includes a first signal electrode to generate a first electric field, and a second signal electrode to generate a second electric field with a reverse phase as compared to the first field. The first waveguide includes a first waveguide on an outward side to which the first field is applied from the first signal electrode, and a first waveguide on a return side to which the second field is applied from the second signal electrode. The second waveguide includes a second waveguide on the outward side to which the first field is applied from the first signal electrode, and a second waveguide on the return side to which the second field is applied from the second signal electrode.Type: ApplicationFiled: April 21, 2022Publication date: December 8, 2022Applicant: Fujitsu Optical Components LimitedInventors: Shuntaro Makino, Masaharu Doi, YOSHIHIKO YOSHIDA
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Publication number: 20220050351Abstract: An optical waveguide device includes an intermediate layer, a thin-film LN layer including X-cut lithium niobate, and a buffer layer stacked on a substrate; an optical waveguide formed in the thin-film LN layer; and an electrode for driving. The intermediate layer is formed by an upper first intermediate layer and a lower second intermediate layer, the second intermediate layer having a permittivity that is smaller than a permittivity of the first intermediate layer.Type: ApplicationFiled: June 17, 2021Publication date: February 17, 2022Applicant: Fujitsu Optical Components LimitedInventors: Shuntaro Makino, Yoshinobu Kubota, Yasuhiro Ohmori, Masaharu Doi, Teruo Kurahashi
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Publication number: 20210325761Abstract: An optical waveguide device has a substrate, an intermediate layer, a thin-film LN layer containing an X-cut lithium niobate, and a buffer layer stacked on the substrate, and an optical waveguide having a ridge shape formed in the thin-film LN layer. The optical waveguide device includes a plurality of electrodes provided, respectively, at a first side and a second side of the optical waveguide. The electrodes are disposed so that respective bottom surfaces thereof are at positions lower than a position of a surface of the buffer layer.Type: ApplicationFiled: February 8, 2021Publication date: October 21, 2021Applicant: Fujitsu Optical Components LimitedInventors: Shuntaro MAKINO, Yoshinobu KUBOTA, Yasuhiro OHMORI, Masaharu DOI, Shintaro TAKEUCHI
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Publication number: 20210325760Abstract: An optical waveguide device includes a substrate on which an intermediate layer, a thin-film LN layer of lithium niobate, and a buffer layer are stacked; an optical waveguide formed in the thin-film LN layer; and a plurality of electrodes near the optical waveguide. The intermediate layer and the buffer layer contain a same material of a metal element of any one of group 3 of group 18 of a periodic table of elements.Type: ApplicationFiled: February 2, 2021Publication date: October 21, 2021Applicant: Fujitsu Optical Components LimitedInventors: Shuntaro Makino, Yoshinobu Kubota, Yasuhiro Ohmori, Masaharu Doi, Teruo Kurahashi, Shintaro Takeuchi
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Publication number: 20210286952Abstract: A conversation analysis system according to the present embodiment utilizes a computer and includes an input unit, a conversation analysis model unit and an information processing unit. The input unit inputs conversational data of utterers who execute a work in cooperation. The conversation analysis model unit analyzes contents of conversations related to work cooperation made by a plurality of utterers based on the conversational data input by the input unit, using a conversation analysis model created by machine learning. The information processing unit creates a plurality of types of evaluation information related to work cooperation based on a conversation analysis result obtained by the conversation analysis model unit.Type: ApplicationFiled: June 3, 2021Publication date: September 16, 2021Applicants: KABUSHIKI KAISHA TOSHIBA, Toshiba Digital Solutions CorporationInventors: Koichi KAGAWA, Junta ASANO, Atsushi KAKEMURA, Masaharu DOI
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Patent number: 11086149Abstract: 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 ?m 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 ?m or larger and less than 1 ?m.Type: GrantFiled: March 27, 2020Date of Patent: August 10, 2021Assignees: TDK CORPORATION, FUJITSU OPTICAL COMPONENTS LIMITEDInventors: Shinji Iwatsuka, Kenji Sasaki, Hiroki Hara, Yasuhiro Ohmori, Masaharu Doi, Shintaro Takeuchi, Yoshihiko Yoshida, Yoshinobu Kubota
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Patent number: 11003043Abstract: 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.Type: GrantFiled: February 24, 2020Date of Patent: May 11, 2021Assignee: TDK CORPORATIONInventors: Yasuhiro Ohmori, Masaharu Doi, Shintaro Takeuchi, Takehito Tanaka, Yoshinobu Kubota, Shinji Iwatsuka, Kenji Endou, Hiroki Hara, Toshinori Matsuura, Takashi Kikukawa
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Patent number: 11003044Abstract: 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.Type: GrantFiled: February 24, 2020Date of Patent: May 11, 2021Assignees: TDK CORPORATION, FUJITSU OPTICAL COMPONENTS LIMITEDInventors: Hiroki Hara, Shinji Iwatsuka, Takashi Kikukawa, Toshinori Matsuura, Yasuhiro Ohmori, Masaharu Doi, Shintaro Takeuchi, Yoshinobu Kubota
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Patent number: 10989980Abstract: 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.Type: GrantFiled: February 24, 2020Date of Patent: April 27, 2021Assignees: TDK CORPORATION, FUJITSU OPTICAL COMPONENTS LIMITEDInventors: Shinji Iwatsuka, Kenji Endou, Hiroki Hara, Toshinori Matsuura, Takashi Kikukawa, Yasuhiro Ohmori, Masaharu Doi, Shintaro Takeuchi, Takehito Tanaka, Yoshinobu Kubota
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Publication number: 20210103165Abstract: 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 ?m or larger and a bent waveguide provided in a region other than the electric field application region and having a curvature radius of 16 ?m or larger and 80 ?m or smaller.Type: ApplicationFiled: March 27, 2020Publication date: April 8, 2021Inventors: Shinji IWATSUKA, Kenji SASAKI, Hiroki HARA, Yasuhiro OHMORI, Masaharu DOI, Shintaro TAKEUCHI, Yoshihiko YOSHIDA, Yoshinobu KUBOTA
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Publication number: 20200310216Abstract: 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 ?m 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 ?m or larger and less than 1 ?m.Type: ApplicationFiled: March 27, 2020Publication date: October 1, 2020Inventors: Shinji IWATSUKA, Kenji SASAKI, Hiroki HARA, Yasuhiro OHMORI, Masaharu DOI, Shintaro TAKEUCHI, Yoshihiko YOSHIDA, Yoshinobu KUBOTA
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Publication number: 20200298882Abstract: According to one embodiment, a transport service method comprises organizing a vehicle group of a plurality of self-driving vehicles in which a parameter value inherent to vehicles falls within a predetermined range, and controlling cooperative travel of the self-driving vehicles in the vehicle group to perform transport service of baggage, persons, animals, and the like.Type: ApplicationFiled: June 5, 2020Publication date: September 24, 2020Applicant: TOSHIBA DIGITAL SOLUTIONS CORPORATIONInventors: Megumi KOBAYASHI, Yasuto HATAFUKU, Masahiro SAMEJIMA, Hideki KUBO, Motokazu IWASAKI, Yoko IKEDA, Shinsuke IUCHI, Kiyoshi TAKEMOTO, Keishi HIGASHI, Kaori KITAMI, Masaharu DOI, Tatsuki SHIRAISHI, Keiji OGATA, Yoshiki YAMAOKA, Masaru WATABIKI, Takeshi NAGAI, Masao UOZUMI, Masatomo SAITO, Michiyo SATO, Masanori TAKAHASHI
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Publication number: 20200272020Abstract: 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.Type: ApplicationFiled: February 24, 2020Publication date: August 27, 2020Inventors: Yasuhiro OHMORI, Masaharu DOI, Shintaro TAKEUCHI, Takehito TANAKA, Yoshinobu KUBOTA, Shinji IWATSUKA, Kenji ENDOU, Hiroki HARA, Toshinori MATSUURA, Takashi KIKUKAWA
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Publication number: 20200271963Abstract: 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.Type: ApplicationFiled: February 24, 2020Publication date: August 27, 2020Inventors: Shinji Iwatsuka, Kenji Endou, Hiroki Hara, Toshinori Matsuura, Takashi Kikukawa, Yasuhiro Ohmori, Masaharu Doi, Shintaro Takeuchi, Takehito Tanaka, Yoshinobu Kubota
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Publication number: 20200272021Abstract: 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.Type: ApplicationFiled: February 24, 2020Publication date: August 27, 2020Applicant: FUJITSU OPTICAL COMPONENTS LIMITEDInventors: Hiroki HARA, Shinji IWATSUKA, Takashi KIKUKAWA, Toshinori MATSUURA, Yasuhiro OHMORI, Masaharu DOI, Shintaro TAKEUCHI, Yoshinobu KUBOTA