Patents by Inventor Hiroyuki Oshida
Hiroyuki Oshida 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: 11965758Abstract: An object of the present invention is to provide a Brillouin optical sensing device and an optical sensing method capable of reducing introduction costs. The Brillouin optical sensing device according to the present invention includes: a sensing fiber 90 in which a plurality of optical fibers having Brillouin frequency shift characteristics different from each other are arranged in parallel; an optical measuring instrument 11 that launches an optical pulse into at least two of the optical fibers of the sensing fiber 90 to generate Brillouin scattering lights and measures a beat frequency of a beat signal between the Brillouin scattering lights at any position of the sensing fiber 90; and an arithmetic processing unit 12 that acquires a physical quantity of the sensing fiber 90 at said any position based on the beat frequency acquired by the optical measuring instrument 11.Type: GrantFiled: May 21, 2020Date of Patent: April 23, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Atsushi Nakamura, Chihiro Kito, Daisuke Iida, Junichi Kawataka, Hiroyuki Oshida
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Patent number: 11948319Abstract: A structure detection device according to an embodiment includes: a reading processing unit that reads, as three-dimensional point group data on an object present in a three-dimensional space, data including three-dimensional position information and color information at a point on a surface of the object; a filtering processing unit that performs filtering processing for extracting three-dimensional point group data on a detection-target structure from the three-dimensional point group data on the object present in the three-dimensional space based on the color information; and a generation processing unit that generates three-dimensional model data in which the detection-target structure is represented as a three-dimensional model based on the three-dimensional point group data on the detection-target structure, the three-dimensional point group data being extracted by the filtering processing unit.Type: GrantFiled: March 18, 2020Date of Patent: April 2, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Masaaki Inoue, Tomoya Shimizu, Ryuji Honda, Hiroyuki Oshida
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Patent number: 11922650Abstract: It is possible to estimate a slack level accurately in consideration of a shape of a deformed cable. A point cloud analysis device sets a plurality of regions of interest obtained by window-searching a wire model including a quadratic curve model representing a cable obtained from a point cloud consisting of three-dimensional points on an object, the region of interest being divided into a first region and a second region.Type: GrantFiled: May 8, 2019Date of Patent: March 5, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Hitoshi Niigaki, Masaki Waki, Masaaki Inoue, Yasuhiro Yao, Tomoya Shimizu, Hiroyuki Oshida, Kana Kurata, Shingo Ando, Atsushi Sagata
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Patent number: 11906387Abstract: The purpose of the present disclosure is to provide a mode field diameter test method and test device that enable acquisition of a mode field diameter for an arbitrary higher-order mode. The present disclosure is a mode field diameter test method including: a test light incidence procedure for selectively causing test light to be incident in a mode subject to measurement, on one end of an optical fiber 10 under test; a far-field pattern measurement procedure for measuring a far-field pattern of the mode subject to measurement, with respect to a divergence angle ? at the other end of the optical fiber under test, by a far-field scanning technique; and a mode field diameter calculation procedure for calculating, using an equation, a mode field diameter from information about incident mode orders in the test light incidence procedure and the far-field pattern measured in the far-field pattern measurement procedure.Type: GrantFiled: September 10, 2019Date of Patent: February 20, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Atsushi Nakamura, Daisuke Iida, Hiroyuki Oshida
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Patent number: 11879803Abstract: An optical fiber testing method is presented for measuring the change amount for the wave number k of a Brillouin Frequency Shift ? in stimulated Brillouin scattering generated in the same acoustic mode with respect to each target propagation mode. In this way, the ratio of the change amount measured at each propagation mode is acquired as the group delay ratio between the modes.Type: GrantFiled: June 3, 2020Date of Patent: January 23, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomokazu Oda, Hiroyuki Oshida, Daisuke Iida, Atsushi Nakamura, Yuto Sagae
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Patent number: 11867555Abstract: It is intended to provide a phase measurement method and a signal processing device that are capable of reducing influence of noise of a measuring device without increasing the peak intensity of an incident light pulse when measuring the phase of scattered light in DAS-P.Type: GrantFiled: March 19, 2020Date of Patent: January 9, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Yoshifumi Wakisaka, Daisuke Iida, Kunihiro Toge, Hiroyuki Oshida
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Patent number: 11860028Abstract: A vibration detection method is presented to accurately detect vibration physically applied to an optical fiber, using a simple determination reference. In a vibration detection method, scattered light of a given target segment of a measurement target fiber is indicated by vectors of an in-phase component and a quadrature component, and a triangular shape constituted by a near-end-side vector of the target segment and a far-end-side vector is used as a physical amount to be tracked. That is, it is determined whether or not there is vibration based on a change in shape of the triangular shape with respect to a reference state. This is a detection method in which DAS-I and DAS-P are combined, a simple determination reference such as shape change of a triangular shape is employed, and overlooking of vibration detection can be reduced.Type: GrantFiled: January 22, 2020Date of Patent: January 2, 2024Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Yoshifumi Wakisaka, Daisuke Iida, Keiji Okamoto, Hiroyuki Oshida
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Patent number: 11828676Abstract: The purpose of this invention is to provide an optical pulse testing method and optical pulse testing device capable of measuring the loss at an end farther than an axially misaligned connection point at which inter-mode crosstalk occurs independently from the crosstalk value at the point. In this optical pulse testing method, a matrix (loss and crosstalk) representing the mode coupling at a near-end connection point is calculated, and an OTDR waveform having the effects of crosstalk eliminated therefrom is obtained by numerical processing using the calculated matrix representing the mode coupling.Type: GrantFiled: June 11, 2019Date of Patent: November 28, 2023Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Atsushi Nakamura, Keiji Okamoto, Hiroyuki Oshida
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Patent number: 11823330Abstract: An object of the present disclosure is to provide a technique for creating a three-dimensional model of a line-like structure from a point cloud obtained using three-dimensional laser measuring equipment and detecting a three-dimensional model of a cable.Type: GrantFiled: August 19, 2019Date of Patent: November 21, 2023Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Masaaki Inoue, Hitoshi Niigaki, Yukihiro Goto, Shigehiro Matsuda, Toshiya Ohira, Ryuji Honda, Tomoya Shimizu, Hiroyuki Oshida
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Publication number: 20230358599Abstract: An object is to provide a vibration detection apparatus and a vibration detection method which can avoid occurrence of a point where detection sensitivity deteriorates in vibration detection of a scattered light intensity monitor according to optical frequency multiplexing. The present invention conceives a multi-dimensional space having as many dimensions as the number of frequencies to be used, causes scattered light intensity change at each optical frequency to correspond to each axis, plots a scattered light signal as a vector on the space, performs linear approximation passing through an origin on the space having a plurality of plotted vector points as original data, and performs vibration detection using a direction vector of an approximate straight line obtained as a result of the approximation.Type: ApplicationFiled: September 11, 2020Publication date: November 9, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Yoshifumi WAKISAKA, Daisuke IIDA, Tatsuya OKAMOTO, Nazuki HONDA, Hiroyuki OSHIDA
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Patent number: 11802809Abstract: The present invention is to provide a backscattered light amplification device, an optical pulse test apparatus, a backscattered light amplification method, and an optical pulse test method for amplifying a desired propagation mode of Rayleigh backscattered light with a desired gain by stimulated Brillouin scattering in a fiber under test having the plurality of propagation modes. The backscattered light amplification device according to the present invention is configured to control individually power, incident timing, and pulse width of a pump pulse for each propagation mode when the pump pulse is incident in a plurality of propagation modes after the probe pulse is input to the fiber under test in any propagation mode.Type: GrantFiled: September 18, 2019Date of Patent: October 31, 2023Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Keiji Okamoto, Atsushi Nakamura, Hiroyuki Oshida
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Publication number: 20230341245Abstract: The present disclosure aims to enable measurement of a long distance exceeding 1 km with a spatial resolution of 100 ?m or lower, and diagnosis of health of an optical device installed at a long distance. An apparatus according to the present disclosure is an optical frequency domain reflectivity measuring apparatus that includes: a local light delay fiber that delays local light; an optical 90-degree hybrid that receives an input of the local light delayed by the local light delay fiber and backscattered light from the measurement target, causes the local light and the backscattered light to interfere with each other, and generates an in-phase component and an orthogonal component of a beat signal generated by the interference; and a balance photodetector that detects the in-phase component and the orthogonal component of the beat signal. In the apparatus, an optical frequency response of the measurement target is measured with respect to a relative distance based on the local light delay fiber.Type: ApplicationFiled: September 15, 2020Publication date: October 26, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tatsuya OKAMOTO, Daisuke IIDA, Hiroyuki OSHIDA
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Patent number: 11788928Abstract: A light intensity distribution measurement apparatus is presented that is capable of accurately measuring the intensity of light in each mode at each position of an optical fiber through which light is propagated in a plurality of modes.Type: GrantFiled: July 11, 2019Date of Patent: October 17, 2023Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomokazu Oda, Yoshifumi Wakisaka, Daisuke Iida, Hiroyuki Oshida
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Patent number: 11788909Abstract: An object of the present disclosure is to provide a method and an apparatus for acquiring curvature and torsion using an inexpensive sensor medium. Disclosed is a measurement apparatus including a fiber ribbon including a plurality of coated fibers arranged in parallel, a strain measurement unit that measures strain amounts of the plurality of coated fibers, and an arithmetic processing unit that calculates curvature and torsion of the fiber ribbon using a strain amount of a coated fiber arranged in a middle portion of the plurality of coated fibers and a strain amount of a coated fiber arranged in a marginal portion of the plurality of coated fibers.Type: GrantFiled: March 5, 2020Date of Patent: October 17, 2023Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Atsushi Nakamura, Daisuke Iida, Hiroyuki Oshida, Tatsuya Okamoto, Tomokazu Oda, Yoshifumi Wakisaka
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Publication number: 20230288231Abstract: An object of the present disclosure is to enable vibration analysis using a spectral shift under appropriate conditions depending on a measurement object. According to the present disclosure, there is provided a vibration distribution measuring apparatus which measures backscattered light in an optical fiber to be measured a plurality of times at different times, extracts an optical spectrum of a window section determined from a plurality of backscattered light waveforms obtained by the measurement, and measures a vibration distribution in the optical fiber to be measured using optical spectra of the plurality of extracted backscattered light waveforms, in which the optical spectrum of the window section is calculated using the window section in which the vibration amplitude in the window section in the optical fiber to be measured is larger than a threshold value defined in the window section.Type: ApplicationFiled: August 26, 2020Publication date: September 14, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tatsuya OKAMOTO, Daisuke IIDA, Hiroyuki OSHIDA
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Publication number: 20230288289Abstract: An object of the present disclosure is to provide a few-mode fiber testing method and a few-mode fiber testing device capable of acquiring a loss and inter-mode crosstalk for each mode at a connection point of a few-mode fiber by measurement only from one end of FUT.Type: ApplicationFiled: August 21, 2020Publication date: September 14, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Atsushi NAKAMURA, Tomokazu ODA, Daisuke IIDA, Hiroyuki OSHIDA
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Publication number: 20230288191Abstract: An object of the present disclosure is to measure, at a high sampling rate, a distribution of a vibration pattern applied to each core after being branched.Type: ApplicationFiled: June 22, 2020Publication date: September 14, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Yoshifumi WAKISAKA, Shingo ONO, Daisuke IIDA, Hiroyuki OSHIDA
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Publication number: 20230288287Abstract: An object of the present disclosure is to provide a power coupling coefficient measurement method and a power coupling coefficient measurement device capable of inexpensively and easily measuring a power coupling coefficient. The power coupling coefficient measurement method according to the present disclosure is a power coupling coefficient measurement method for measuring a power coupling coefficient of a multi-core fiber in order to achieve the aforementioned object, and includes: inputting a test light pulse from one end of the multi-core fiber to any one of cores; receiving backscattered light of the core to which the test light pulse is input or any one of the other cores; measuring an intensity distribution of the backscattered light with respect to a distance from the one end of the multi-core fiber; and calculating the power coupling coefficient from the intensity distribution of the backscattered light.Type: ApplicationFiled: August 21, 2020Publication date: September 14, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Atsushi NAKAMURA, Daisuke IIDA, Tomokazu ODA, Hiroyuki OSHIDA
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Publication number: 20230288466Abstract: distribution of the any higher-order mode.Type: ApplicationFiled: August 7, 2020Publication date: September 14, 2023Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Tomokazu ODA, Atsushi NAKAMURA, Daisuke IIDA, Hiroyuki OSHIDA
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Patent number: 11754465Abstract: An object of the present invention is to provide an optical pulse test apparatus and an optical pulse test method that are capable of determining a change in state of an optical fiber connection portion without the need for reference and without being affected by changes in gap interval before and after the change in state. The optical pulse test apparatus according to the present invention is configured to perform an OTDR measurement by using test optical pulses having spectral widths of from several nm to several hundred nm arranged at intervals of several ten nm to several hundred nm, calculate a reflection peak value caused by the Fresnel reflection at the connection portion from the obtained OTDR waveform, and determine a state such as water immersion of the optical fiber connection portion based on the value.Type: GrantFiled: September 4, 2019Date of Patent: September 12, 2023Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Atsushi Nakamura, Nazuki Honda, Daisuke Iida, Hiroyuki Oshida, Keiji Okamoto