Patents by Inventor Hirotaka Ono

Hirotaka Ono 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).

  • Patent number: 11888281
    Abstract: There is provided a multimode optical amplifier that provides gain to a plurality of propagation modes of signal light. The multimode optical amplifier includes a multiplexer that multiplexes the signal light and excitation light; an amplifying fiber which has a core that propagates a predetermined plurality of propagation modes of the signal light and a predetermined plurality of propagation modes of the excitation light, and which provides an individual gain value for each of the predetermined propagation modes of the signal light; a wavelength-flattening filter that maintains a constant gain value for a frequency for all predetermined propagation modes of the signal light; and a mode-flattening filter that maintains the gain value at a constant value for a predetermined propagation mode of the signal light for all predetermined propagation modes of the signal light.
    Type: Grant
    Filed: July 12, 2019
    Date of Patent: January 30, 2024
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hirotaka Ono, Takayuki Mizuno, Koki Shibahara, Yutaka Miyamoto
  • Patent number: 11881895
    Abstract: An optical repeater device includes an amplifier module and a monitoring control circuit. The optical amplifier module includes an amplifier optical circuit including a plurality of amplification cores that amplify signal light propagating through different cores, and an optical amplifier control circuit that receives detection results from optical detectors at a plurality of signal light waveguide points of the amplifier optical circuit and generates a control signal directed to an excitation light source.
    Type: Grant
    Filed: June 27, 2019
    Date of Patent: January 23, 2024
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventor: Hirotaka Ono
  • Publication number: 20230379383
    Abstract: A communication system includes a first communication apparatus communicating with a processing apparatus and a second communication apparatus performing an obtainment/transmission procedure of obtaining sensor information from a sensor unit and transmitting the sensor information to the first communication apparatus. The sensor unit includes at least one sensor. The first communication apparatus transmits the sensor information from the second communication apparatus to the processing apparatus, in response to an obtainment wish timing with which the processing apparatus wishes to obtain the sensor information. The second communication apparatus determines a start timing to start the obtainment/transmission procedure, based on a first time required to communicate between the first and second communication apparatuses when the second communication apparatus transmits the sensor information to the first communication apparatus.
    Type: Application
    Filed: March 22, 2023
    Publication date: November 23, 2023
    Applicant: MegaChips Corporation
    Inventors: Motoaki YASUI, Hirotaka ONO
  • Publication number: 20220368423
    Abstract: An optical repeater device includes an amplifier module and a monitoring control circuit. The optical amplifier module includes an amplifier optical circuit including a plurality of amplification cores that amplify signal light propagating through different cores, and an optical amplifier control circuit that receives detection results from optical detectors at a plurality of signal light waveguide points of the amplifier optical circuit and generates a control signal directed to an excitation light source.
    Type: Application
    Filed: June 27, 2019
    Publication date: November 17, 2022
    Inventor: Hirotaka Ono
  • Publication number: 20220317349
    Abstract: A mode equalization filter for reducing a difference in optical power between modes of signal light propagating inside FMFs of an MDM optical transmission scheme includes an FMF on the input side, a collimating lens, an ND filter, a condensing lens, and an FMF on the output side. The ND filter includes partial ND filters combined each other and having main surfaces placed in parallel to each other, a ring portion having a low transmittance is provided in a part of the partial ND filter, and a ring portion having a low transmittance is also provided in a part of the partial ND filter. When the ring portions have different aspects, and the partial ND filters are adjusted and set to be slidable in directions of axes, respectively, the partial ND filters have a property that the transmittance of each mode of the signal light differs and can obtain a function of a variable mode equalization filter.
    Type: Application
    Filed: August 14, 2019
    Publication date: October 6, 2022
    Inventors: Hirotaka Ono, Takayuki Mizuno, Koki Shibahara, Yutaka Miyamoto
  • Publication number: 20220292336
    Abstract: An optical information processing device is a device that realizes reservoir computing using light. In the optical information processing device, a portion including a light source, an optical modulator, and an optical splitter is an input layer, a portion including optical couplers, a mode multiplexer, a mode demultiplexer, a multi-mode fiber, and an amplification and attenuator is a reservoir layer, a portion including an optical detector, a multiplier, and a summer is an output layer. The reservoir computing with light includes the input layer, the reservoir layer, and the output layer, and further includes a calculation circuit.
    Type: Application
    Filed: August 20, 2019
    Publication date: September 15, 2022
    Inventors: Hirotaka Ono, Mitsumasa Nakajima, Shiori Konisho, Kenji Tanaka, Toshikazu Hashimoto
  • Patent number: 11438071
    Abstract: An optical repeater in a mode-division-multiplexing (MDM) optical transmission system prevents a signal-to-noise ratio (SNR) from deteriorating due to a loss of a mode demultiplexer. The optical repeater in the MDM optical transmission system is configured to include at least one multimode optical amplifier, a mode demultiplexer, a mode multiplexer, and variable optical attenuators. One of the multimode optical amplifiers is disposed on the input side of the mode demultiplexer.
    Type: Grant
    Filed: December 3, 2019
    Date of Patent: September 6, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hirotaka Ono, Koki Shibahara, Takayuki Mizuno, Yutaka Miyamoto
  • Patent number: 11362753
    Abstract: An optical node device includes one or more input-side wavelength selection switches, a plurality of output-side wavelength selection switches, and an amplification unit. The input-side wavelength selection switches include a plurality of output ports, separate input light in accordance with a wavelength, and output the separated light from the output port corresponding to an output destination of the separated light. The output-side wavelength selection switches include input ports each receiving the light output from each of the one or more input-side wavelength selection switches, multiplex the light received from the input ports, and output the light. The amplification unit amplifies the light output from each of the output ports of the input-side wavelength selection switches and outputs the amplified light to the output-side wavelength selection switch at the output destination corresponding to the output port.
    Type: Grant
    Filed: February 1, 2019
    Date of Patent: June 14, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hirotaka Ono, Mitsunori Fukutoku, Shingo Kawai, Yutaka Miyamoto
  • Publication number: 20220120960
    Abstract: An amplification fiber includes a core which is doped with an erbium ion and a cladding which surrounds the core and has a refractive index lower than a refractive index of the core, and a relative refractive index difference ?n51 between the core and the cladding is not more than a smaller one of values of a relative refractive index difference ?n1 expressed as a predetermined expression related to a radius a of the core and a relative refractive index difference ?n2 expressed as a predetermined expression related to the radius a of the core.
    Type: Application
    Filed: January 30, 2020
    Publication date: April 21, 2022
    Inventors: Hirotaka ONO, Yutaka MIYAMOTO
  • Publication number: 20220045759
    Abstract: An optical repeater in an MDM optical transmission system prevents a signal-to-noise ratio (SNR) from deteriorating due to a loss of a mode demultiplexer. The optical repeater in the MDM optical transmission system is configured to include at least one multimode optical amplifier, a mode demultiplexer, a mode multiplexer, and variable optical attenuators. One of the multimode optical amplifiers is disposed on the input side of the mode demultiplexer.
    Type: Application
    Filed: December 3, 2019
    Publication date: February 10, 2022
    Inventors: Hirotaka Ono, Koki Shibahara, Takayuki Mizuno, Yutaka Miyamoto
  • Publication number: 20220014301
    Abstract: When a first connection number of a b-th output port in an a-th wavelength selective switch connected to paths in one side out of a Drop side and an Add side is expressed by f(a, b, k), and a second connection number of a d-th output port in a c-th wavelength selective switch connected to paths in the other side out of the Drop side and the Add side is expressed by g(c, d, k), f(a, b, k)?g(c, d, k).
    Type: Application
    Filed: November 13, 2019
    Publication date: January 13, 2022
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Kazunori SENOO, Kenya SUZUKI, Keita YAMAGUCHI, Takayuki MIZUNO, Hirotaka ONO, Toshikazu HASHIMOTO, Yutaka MIYAMOTO
  • Publication number: 20210263214
    Abstract: Provided is a mode equalization filter that reduces a light intensity difference between multiple modes of signal light propagating in a core of a few-mode fiber. The mode equalization filter according to the present invention includes: a collimator lens that collimates the signal light emitted from the few-mode fiber; a partial ND filter including a small dot having small transmittance with respect to the collimated signal light; and condensing lenses that condense the signal light transmitted through the partial ND filter on the few-mode fiber. The small dot having the small transmittance is arranged in a part of the partial ND filter, and the partial ND filter is arranged such that, when the collimated signal light is transmitted, a part of the collimated signal light overlaps with the small dot having the small transmittance.
    Type: Application
    Filed: July 12, 2019
    Publication date: August 26, 2021
    Inventors: Hirotaka Ono, Takayuki Mizuno, Koki Shibahara, Yutaka Miyamoto
  • Publication number: 20210257802
    Abstract: There is provided a multimode optical amplifier that provides gain to a plurality of propagation modes of signal light. The multimode optical amplifier includes a multiplexer that multiplexes the signal light and excitation light; an amplifying fiber which has a core that propagates a predetermined plurality of propagation modes of the signal light and a predetermined plurality of propagation modes of the excitation light, and which provides an individual gain value for each of the predetermined propagation modes of the signal light; a wavelength-flattening filter that maintains a constant gain value for a frequency for all predetermined propagation modes of the signal light; and a mode-flattening filter that maintains the gain value at a constant value for a predetermined propagation mode of the signal light for all predetermined propagation modes of the signal light.
    Type: Application
    Filed: July 12, 2019
    Publication date: August 19, 2021
    Inventors: Hirotaka Ono, Takayuki Mizuno, Koki Shibahara, Yutaka Miyamoto
  • Publication number: 20210159996
    Abstract: An optical node device includes one or more input-side wavelength selection switches, a plurality of output-side wavelength selection switches, and an amplification unit. The input-side wavelength selection switches include a plurality of output ports, separate input light in accordance with a wavelength, and output the separated light from the output port corresponding to an output destination of the separated light. The output-side wavelength selection switches include input ports each receiving the light output from each of the one or more input-side wavelength selection switches, multiplex the light received from the input ports, and output the light. The amplification unit amplifies the light output from each of the output ports of the input-side wavelength selection switches and outputs the amplified light to the output-side wavelength selection switch at the output destination corresponding to the output port.
    Type: Application
    Filed: February 1, 2019
    Publication date: May 27, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hirotaka ONO, Mitsunori FUKUTOKU, Shingo KAWAI, Yutaka MIYAMOTO
  • Patent number: 10965375
    Abstract: An optical node device includes: a multicore optical amplification unit that amplifies collectively light transmitted along a multicore fiber; a separation unit that inputs the amplified light in each core to each of a plurality of input-side single-core fibers; an optical cross-connect switch that attenuates the light input from each of the plurality of input-side single-core fibers through an optical attenuator, separates the light in accordance with a wavelength, and outputs the separated light to an output-side single-core fiber of a plurality of output-side single-core fibers related to a respective output destination; a plurality of single-core optical amplification units that amplify the light transmitted along the corresponding output-side single-core fibers; and an output unit that outputs the light transmitted along each of the plurality of output-side single-core fibers to a multicore fiber.
    Type: Grant
    Filed: February 8, 2019
    Date of Patent: March 30, 2021
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hirotaka Ono, Kazunori Senoo, Kenya Suzuki, Keita Yamaguchi, Mitsunori Fukutoku, Shingo Kawai, Yutaka Miyamoto
  • Publication number: 20210041622
    Abstract: Provided are a multi-core fiber that enables complete automation of alignment in fusion splicing of multi-core fibers and an apparatus for manufacturing the multi-core fiber. A glass cladding of the multi-core fiber has a coating. A coating marker is drawn on the coating at a position that is determined by a predetermined rule that prescribes a positional relation with the core, for example, the coating marker is drawn on the coating near a specific core number. During fusion splicing of the multi-core fibers, two multi-core fibers are installed such that positions of the coating markers are substantially aligned. After the installation of the multi-core fibers, the coating markers of the two multi-core fibers are subjected to automatic rotational alignment by a fusion splicer to achieve a predetermined positional relation, and thus rotational positions between the two multi-core fibers are aligned.
    Type: Application
    Filed: February 8, 2019
    Publication date: February 11, 2021
    Inventors: Hirotaka Ono, Shinichi Aozasa
  • Publication number: 20210036781
    Abstract: An optical node device includes: a multicore optical amplification unit that amplifies collectively light transmitted along a multicore fiber; a separation unit that inputs the amplified light in each core to each of a plurality of input-side single-core fibers; an optical cross-connect switch that attenuates the light input from each of the plurality of input-side single-core fibers through an optical attenuator, separates the light in accordance with a wavelength, and outputs the separated light to an output-side single-core fiber of a plurality of output-side single-core fibers related to a respective output destination; a plurality of single-core optical amplification units that amplify the light transmitted along the corresponding output-side single-core fibers; and an output unit that outputs the light transmitted along each of the plurality of output-side single-core fibers to a multicore fiber.
    Type: Application
    Filed: February 8, 2019
    Publication date: February 4, 2021
    Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Hirotaka ONO, Kazunori SENOO, Kenya SUZUKI, Keita YAMAGUCHI, Mitsunori FUKUTOKU, Shingo KAWAI, Yutaka MIYAMOTO
  • Patent number: 9698557
    Abstract: An optical fiber for amplification includes a core having an inner core and an outer core surrounding the outer circumferential surface of the inner core. The relative refractive index difference of the inner core to a cladding is smaller than the relative refractive index difference of the outer core to the cladding. The outer core is entirely doped with erbium. The theoretical cutoff wavelength of an LP11 mode light beam is a wavelength of 1,565 nm or more. The theoretical cutoff wavelength of an LP21 mode light beam is a wavelength of 1,530 nm or less. The theoretical cutoff wavelength of the LP02 mode light beam is a wavelength of 980 nm or less.
    Type: Grant
    Filed: March 7, 2016
    Date of Patent: July 4, 2017
    Assignees: FUJIKURA LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATION, OSAKA PREFECTURE UNIVERSITY PUBLIC CORPORATION
    Inventors: Tsukasa Hosokawa, Kentaro Ichii, Katsuhiro Takenaga, Shoichiro Matsuo, Hirotaka Ono, Makoto Yamada
  • Patent number: 9673589
    Abstract: An amplification optical fiber operable to propagate light beams in a plurality of modes in a predetermined wavelength range through a core doped with a rare earth element, wherein Expression (1) is satisfied, where a cutoff wavelength of a propagated highest mode light beam is defined as ?max, under conditions in which the cutoff wavelength of the highest mode light beam is defined as ?c, a shortest wavelength of the wavelength range is defined as ?min, and a cutoff wavelength of a second-highest mode light beam to the highest mode light beam is ?min. ?c>0.5 ?min+0.5 ?max??(1).
    Type: Grant
    Filed: August 15, 2016
    Date of Patent: June 6, 2017
    Assignees: FUJIKURA LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATION, OSAKA PREFECTURE UNIVERSITY PUBLIC CORPORATION
    Inventors: Tsukasa Hosokawa, Kentaro Ichii, Katsuhiro Takenaga, Shoichiro Matsuo, Hirotaka Ono, Makoto Yamada
  • Publication number: 20170054266
    Abstract: An amplification optical fiber operable to propagate light beams in a plurality of modes in a predetermined wavelength range through a core doped with a rare earth element, wherein Expression (1) is satisfied, where a cutoff wavelength of a propagated highest mode light beam is defined as ?max, under conditions in which the cutoff wavelength of the highest mode light beam is defined as ?c, a shortest wavelength of the wavelength range is defined as ?min, and a cutoff wavelength of a second-highest mode light beam to the highest mode light beam is ?min. ?c>0.5 ?min+0.
    Type: Application
    Filed: August 15, 2016
    Publication date: February 23, 2017
    Applicants: FUJIKURA LTD., NIPPON TELEGRAPH AND TELEPHONE CORPORATION, OSAKA PREFECTURE UNIVERSITY PUBLIC CORPORATION
    Inventors: Tsukasa Hosokawa, Kentaro Ichii, Katsuhiro Takenaga, Shoichiro Matsuo, Hirotaka Ono, Makoto Yamada