Patents by Inventor Kenji Nagase
Kenji Nagase 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: 11947147Abstract: An optical device including: a substrate; an optical waveguide formed at the substrate; and a protective layer formed adjacent to the optical waveguide, wherein the optical waveguide includes multiple side surfaces that intersect the substrate, at least one side surface of the optical waveguide is provided with a rough surface. According to the optical device of the present invention, the light propagation loss can be reduced.Type: GrantFiled: March 29, 2022Date of Patent: April 2, 2024Assignee: TDK CORPORATIONInventors: Kenji Nagase, Hiroshi Take, Anthony Reymund Melad Binarao, Cheng Bu Heng
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Publication number: 20230375781Abstract: An electro-optic device which is provided with: a substrate, an optical waveguide formed on the substrate, and an upper electrode formed on the optical waveguide. The electro-optic device is further provided with a buffer layer formed between the substrate and the upper electrode, and a boundary portion of the optical waveguide and the buffer layer forms an oxide layer different from the optical waveguide and the buffer layer in composition.Type: ApplicationFiled: September 29, 2021Publication date: November 23, 2023Applicant: TDK CORPORATIONInventors: Hiroshi TAKE, Kenji NAGASE, Anthony Reymund Melad BINARAO, Cheng Bu HENG
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Publication number: 20230333417Abstract: An optical modulator, including: a substrate; a plurality of electro-optic material layers formed on the substrate; and an electrode formed on the electro-optic material layer; wherein the electro-optic material layer has a patterned RF portion waveguide that applies a modulated signal and a patterned DC portion waveguide that applies a direct current bias signal; and on a section perpendicular to a light propagation direction, the sectional area of the DC portion waveguide is greater than the sectional area of the RF portion waveguide.Type: ApplicationFiled: September 29, 2021Publication date: October 19, 2023Applicant: TDK CORPORATIONInventors: Kenji NAGASE, Hiroshi TAKE, Anthony Reymund Melad BINARAO, Cheng Bu HENG
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Publication number: 20230314710Abstract: The present invention provides an optical device and an optical modulator, the optical device comprises an optical waveguide, at an surface of plate-like or film-like electro-optic material forming the optical waveguide, 3 locations are selected in the extension direction of the optical waveguide, and 2 locations are selected in the width direction of the optical waveguide in a range of a region of 0.1×0.1 ?m, and for a total of 6 locations, an surface roughness RMS is measured with Atomic Force Microscope, and an average of the RMS is 5.1 nm or less. According to the optical device in the present invention, the occurrence of micro-cracks at the optical waveguide can be suppressed, thereby reducing the light propagation loss.Type: ApplicationFiled: March 28, 2023Publication date: October 5, 2023Applicant: TDK CORPORATIONInventors: Kenji NAGASE, Hiroshi TAKE, Anthony Reymund Melad BINARAO, Cheng Bu HENG
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Publication number: 20230314852Abstract: An optical device, including a substrate; an optical waveguide provided in a predetermined region of the substrate and formed of an electro-optic material film; a protective layer formed adjacent to the optical waveguide; and a non-light-propagation optical waveguide provided outside the predetermined region, wherein the surface roughness of the non-light-propagation optical waveguide is RMS 0.5 nm or more. According to the optical device, the occurrence of micro-cracks on the optical waveguide can be suppressed, thereby reducing the light propagation loss.Type: ApplicationFiled: March 27, 2023Publication date: October 5, 2023Applicant: TDK CORPORATIONInventors: Kenji NAGASE, Hiroshi TAKE, Anthony Reymund Melad BINARAO, Cheng Bu HENG
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Publication number: 20230296929Abstract: An optical modulation element is provided with a substrate, a waveguide layer formed on the substrate, a dielectric layer formed on the waveguide layer, and an electrode formed on the dielectric layer. An outer peripheral end portion of the dielectric layer has an offset area positioned inside an outer peripheral end portion of the substrate. In at least a part of the offset area, a distance from the outer peripheral end portion of the substrate to the outer peripheral end portion of the dielectric layer is equal to or less than a distance from the outer peripheral end portion of the substrate to the outer peripheral end portion of the electrode.Type: ApplicationFiled: February 6, 2023Publication date: September 21, 2023Inventors: Hiroki HARA, Takashi KIKUKAWA, Hiroshi TAKE, Kenji NAGASE, Shuntaro KODAMA
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Publication number: 20230124507Abstract: An electro-optical device includes an optical waveguide and an upper electrode provided on the optical waveguide, the optical waveguide is formed by turning back on a plane, the upper electrode has adjacent parts by turning back the optical waveguide, and an upper layer higher than the upper electrode between the adjacent parts includes a metal layer. Alternatively, an electro-optic device includes a plurality of Mach-Zehnder optical waveguides, wherein the Mach-Zehnder optical waveguide includes a first optical waveguide and a second optical waveguide, a first upper electrode is provided on the first optical waveguide and a second upper electrode is provided on the second optical waveguide, and an upper layer higher than the first upper electrode and the second upper electrode between the first upper electrode and the second upper electrode includes a metal layer. An electro-optic device is capable of suppressing electrical crosstalk between components and seeking wide frequency band.Type: ApplicationFiled: March 31, 2021Publication date: April 20, 2023Applicant: TDK CORPORATIONInventors: Kenji NAGASE, Anthony Reymund Melad BINARAO, Cheng Bu HENG, Hiroshi TAKE
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Publication number: 20230122741Abstract: An optical modulators is disclosed. The optical modulator includes a substrate, an optical waveguide formed on the substrate, a signal electrode formed on the optical waveguide via a first buffer layer and applying a modulation signal to the optical waveguide, and a bias electrode formed on the optical waveguide via a second buffer layer and applying a DC bias to the optical waveguide, the first buffer layer and the second buffer layer are formed in such a way that either one of the first buffer layer and the second buffer layer covers an end surface of the other one of the first buffer layer and the second buffer layer at a boundary part of the first buffer layer and the second buffer layer. Accordingly, an optical modulator with high reliability can be provided.Type: ApplicationFiled: March 31, 2021Publication date: April 20, 2023Applicant: TDK CORPORATIONInventors: Hiroshi TAKE, Kenji NAGASE, Anthony Reymund Melad BINARAO, Cheng Bu HENG
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Publication number: 20230112785Abstract: An electro-optical device, including: a substrate; an optical waveguide film formed of electro-optical material provided in a predetermined region on the substrate; a buffer layer provided adjacent to the optical waveguide film; and an electrode for applying an electric field to the optical waveguide film, and a non-light-transmission optical waveguide film is provided outside the predetermined region. According to the electro-optical device of the present disclosure, the propagation loss of light can be suppressed.Type: ApplicationFiled: March 31, 2021Publication date: April 13, 2023Applicant: TDK CORPORATIONInventors: Kenji NAGASE, Hiroshi TAKE
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Publication number: 20230115362Abstract: An electro-optical device, including: a substrate; an optical waveguide composed of an electro-optic material film formed in a ridge shape on the substrate; a buffer layer configured to cover the optical waveguide; and an upper electrode provided on the optical waveguide through the buffer layer, and the buffer layer has a recess on the upper electrode side above the optical waveguide. Accordingly, the propagation loss of light can be suppressed.Type: ApplicationFiled: March 31, 2021Publication date: April 13, 2023Applicant: TDK CORPORATIONInventors: Kenji NAGASE, Hiroshi TAKE, Shingo MIYATA
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Publication number: 20230069468Abstract: An optical waveguide element includes: an optical waveguide having a ridge part and a slab part having a thickness less than the ridge part. The optical waveguide includes: a first waveguide having a first ridge with and a first slab film thickness; a second waveguide having a second ridge width and a second slab film thickness; a first intermediate waveguide connected to the first waveguide and having a third ridge width and the first slab film thickness; and a second intermediate waveguide connected to the second waveguide and having a fourth ridge width and the second slab film thickness. The first waveguide, the first intermediate waveguide, the second intermediate waveguide, and the second waveguide are arranged in this order; the second slab film thickness is larger than the first slab film thickness; and the third ridge width is larger than the fourth ridge width.Type: ApplicationFiled: January 20, 2021Publication date: March 2, 2023Inventors: Shinji Iwatsuka, Hiroki HARA, Anthony Reymund Melad BINARAO, Cheng Bu HENG, Hiroshi TAKE, Kenji NAGASE
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Publication number: 20230057036Abstract: To provide an optical modulation element whereby reduced drive voltage and suppression of DC drift can be obtained at the same time. An optical modulation element includes: a substrate; and an optical waveguide formed of an electrooptic material film formed on the substrate and having a ridge part which is a protruding portion, and a slab part having a smaller film thickness than the ridge part 11r. The optical waveguide includes a first waveguide part having a first ridge width and a first slab film thickness and to which an RF signal is applied, and a second waveguide part having a second ridge width and a second slab film thickness different from the first slab film thickness and to which a DC bias is applied.Type: ApplicationFiled: January 20, 2021Publication date: February 23, 2023Inventors: Anthony Reymund Melad Binarao, Cheng Bu HENG, Hiroshi TAKE, Kenji NAGASE, Shinji IWATSUKA, Hiroki HARA
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Publication number: 20230036811Abstract: The invention relates to an optical modulator. The optical modulator comprising: a substrate; an electro-optical material layer formed on a predetermined region of the substrate; a buffer layer formed on the substrate which is provided so as to cover the electro-optical material layer; and an electrode formed on the buffer layer, and the electro-optical material layer has a RF portion optical waveguide which is applied with a modulation signal and is patterned, and a DC portion optical waveguide which is applied with a DC voltage and is patterned, the electrode has an RF portion electrode formed on the buffer layer where the RF portion optical waveguide is located and a DC portion electrode formed on the buffer layer where the DC portion optical waveguide is located, the film thickness of the DC portion electrode is smaller than the film thickness of the RF portion electrode.Type: ApplicationFiled: April 8, 2022Publication date: February 2, 2023Applicant: TDK CORPORATIONInventors: Kenji NAGASE, Hiroshi TAKE, Anthony Reymund Melad BINARAO, Cheng Bu HENG
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Publication number: 20220326554Abstract: An electro-optical device includes a substrate, an optical waveguide formed on the substrate, a buffer layer formed on the substrate which is provided so as to cover the optical waveguide and an electrode formed on the buffer layer, when viewed in a propagation direction of light, a side surface of the optical waveguide has at least one slope change point. An electro-optical device can reduce the driving voltage and provide the propagation loss of light.Type: ApplicationFiled: March 29, 2022Publication date: October 13, 2022Applicant: TDK CORPORATIONInventors: Hiroshi TAKE, Kenji NAGASE, Anthony Reymund Melad BINARAO, Cheng Bu HENG
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Publication number: 20220326555Abstract: The optical device includes a substrate and an optical waveguide formed on the substrate, a protrusion portion is formed on the substrate adjacent to the optical waveguide.Type: ApplicationFiled: March 29, 2022Publication date: October 13, 2022Applicant: TDK CORPORATIONInventors: Hiroshi TAKE, Kenji NAGASE, Anthony Reymund Melad BINARAO, Cheng Bu HENG, Atsushi SHIMURA
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Publication number: 20220317371Abstract: A optical device including: a substrate; an optical waveguide formed at the substrate; and a protective layer formed adjacent to the optical waveguide, wherein the optical waveguide includes multiple side surfaces that intersect the substrate, at least one side surface of the optical waveguide is provided with a rough surface. According to the optical device, the light propagation loss can be reduced.Type: ApplicationFiled: March 29, 2022Publication date: October 6, 2022Applicant: TDK CORPORATIONInventors: Kenji NAGASE, Hiroshi TAKE, Anthony Reymund Melad BINARAO, Cheng Bu HENG
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Publication number: 20220317358Abstract: An optical device including: a substrate; an optical waveguide formed at the substrate; and a protective layer formed adjacent to the optical waveguide, wherein the optical waveguide includes multiple side surfaces that intersect the substrate, at least one side surface of the optical waveguide is provided with a rough surface. According to the optical device of the present invention, the light propagation loss can be reduced.Type: ApplicationFiled: March 29, 2022Publication date: October 6, 2022Applicant: TDK CORPORATIONInventors: Kenji NAGASE, Hiroshi TAKE, Anthony Reymund Melad BINARAO, Cheng Bu HENG
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Patent number: 11237002Abstract: A server is connected to a communication terminal and configured to receive a departure point, a destination, and a route retrieval request from the departure point to the destination from the terminal and to deliver a route retrieved in response to the received route retrieval request to the terminal. When the route retrieval request is acquired from the terminal, the server acquires route information related to a target route that is a route corresponding to a predetermined distance from the departure point in a terminal-recommended route that is a route from the departure point to the destination and is retrieved by using terminal-side map information provided in the terminal. The server retrieves a route to the destination that includes at least a part of the target route by using device-side map information provided in the server and the route information, and delivers the retrieved route to the terminal.Type: GrantFiled: March 23, 2017Date of Patent: February 1, 2022Assignees: AISIN CORPORATION, TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Tominori Iwata, Daisuke Tanizaki, Koichi Iwatsuki, Toyoji Hiyokawa, Kenji Nagase, Motohiro Nakamura, Kazunori Watanabe
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Patent number: 11204256Abstract: Movement guidance information for performing traveling guidance for a vehicle is requested to a guidance information delivering server device based on an area update table and an area identification table for managing an update state of map information in a communication terminal, and traveling guidance for the vehicle is performed based on the movement guidance information delivered from the guidance information delivering server device in response to the request.Type: GrantFiled: December 8, 2017Date of Patent: December 21, 2021Assignee: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Shingo Aoyama, Daisuke Tanizaki, Kenji Nagase, Motohiro Nakamura, Kazunori Watanabe
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Publication number: 20200364393Abstract: A non-transitory computer-readable recording medium storing a bypass capacitor arrangement selection program for causing a computer to execute a process, the process includes: setting a first power supply pin of one or more power supply pins located closest to a first signal pin of one or more signal pins, as a power supply pin to which a capacitor for noise countermeasure is coupled, in a circuit component including the one or more signal pins and the one or more power supply pins; and displaying the first power supply pin and a first mark indicating the capacitor for the noise countermeasure in a circuit diagram including display of the circuit component.Type: ApplicationFiled: May 12, 2020Publication date: November 19, 2020Applicant: FUJITSU LIMITEDInventors: Tomoyuki NAKAO, Yoshiaki Hiratsuka, Kenji NAGASE