Patents by Inventor Yoshihisa Inada

Yoshihisa Inada 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).

  • Publication number: 20220182170
    Abstract: Aspects of the present disclosure describe systems, methods. and structures directed to an integrated 3-way branching unit switch module suitable for undersea application.
    Type: Application
    Filed: December 6, 2021
    Publication date: June 9, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Fatih YAMAN, Shinsuke FUJISAWA, Hussam BATSHON, Takigawa YOSHINARI, Ryuji AIDA, Takanori INOUE, Eduardo Rodriguez, Yoshihisa INADA
  • Publication number: 20220173808
    Abstract: Aspects of the present disclosure describe systems, methods. and structures in which guided acoustic Brillouin (GAWBS) noise is measured using a homodyne measurement technique and demonstrated using a number of optical fibers, such fibers being commonly used in contemporary optical communications systems. The measurements are made with single spans and determined to be consistent with separate multi-span long-distance measurements. Additionally, a technique for preparing an optical fiber exhibiting superior GAWBS noise characteristics by reducing coherence length of the optical fiber by spinning the fiber at a high rate during the drawing process such that birefringence coherence length is reduced.
    Type: Application
    Filed: December 1, 2021
    Publication date: June 2, 2022
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Fatih YAMAN, Kohei NAKAMURA, Takanori INOUE, Eduardo Mateo RODRIGUEZ, Shinsuke FUJISAWA, Hussam BATSHON, Yoshihisa INADA, Takaaki OGATA
  • Publication number: 20220085896
    Abstract: Aspects of the present disclosure describe a three-way branching unit switch module having a small footprint suitable for application in an undersea application.
    Type: Application
    Filed: September 7, 2021
    Publication date: March 17, 2022
    Applicants: NEC Laboratories America, Inc., NEC Corporation
    Inventors: Fatih YAMAN, Shinsuke FUJISAWA, Hussam BATSHON, Yoshinari Takigawa, Ryu Kurahashi, Ryuji Aida, Kohei NAKAMURA, Takanori INOUE, Eduardo RODRIGUEZ, Yoshihisa INADA
  • Patent number: 11270200
    Abstract: Aspects of the present disclosure describe a method for digital coherent transmission systems that advantageously provides low-complexity, single-step nonlinearity compensation based on artificial intelligence (AI) implemented in a deep neuron network (DNN).
    Type: Grant
    Filed: February 26, 2019
    Date of Patent: March 8, 2022
    Inventors: Shaoliang Zhang, Fatih Yaman, Ting Wang, Eduardo Rodriguez, Yoshihisa Inada, Kohei Nakamura, Takanori Inoue
  • Publication number: 20220011195
    Abstract: Aspects of the present disclosure describe a method for estimating mode field distribution in optical fibers from guided acoustic-wave Brillouin scattering wherein light for which the optical mode-field distribution is determined remains in the optical fibers and the distribution is made for light inside the fiber, and not at a fiber/air interface or other perturbation points to the fiber resulting in a more accurate representation of the optical mode-field distribution in the fiber. Since light is always in the fiber during the determination, no complicated fiber preparation steps or procedures are required and the mode-field distribution is determined as an average distribution along the length of the fiber under test.
    Type: Application
    Filed: June 7, 2021
    Publication date: January 13, 2022
    Applicants: NEC LABORATORIES AMERICA, INC, NEC Corporation
    Inventors: Fatih YAMAN, Eduardo Mateo RODRIGUEZ, Shinsuke FUJISAWA, Hussam BATSHON, Kohei NAKAMURA, Takanori INOUE, Yoshihisa INADA, Takaaki OGATA
  • Publication number: 20210320741
    Abstract: An optical transmission system includes: a terminal station device that transmits a wavelength multiplexed optical signal resulting from multiplexing an optical signal and dummy light; and an optical add-drop multiplexer that receives respective wavelength multiplexed optical signals transmitted from a plurality of the terminal station devices and performs add-drop processing on the wavelength multiplexed optical signals. The dummy light has a wavelength arrangement in which adjacent wavelengths are arranged with equal spacing, and the wavelength arrangement of the dummy light differs between the terminal station devices.
    Type: Application
    Filed: June 23, 2021
    Publication date: October 14, 2021
    Applicant: NEC Corporation
    Inventor: Yoshihisa INADA
  • Publication number: 20210256347
    Abstract: Aspects of the present disclosure describe optical transmission systems exhibiting low complexity fiber nonlinearity compensation provided by neural networks using lookup tables for multiplication operations.
    Type: Application
    Filed: January 12, 2021
    Publication date: August 19, 2021
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Shinsuke FUJISAWA, Fatih YAMAN, Eduardo Mateo RODRIGUEZ, Yoshihisa INADA, Kohei NAKAMURA, Takanori INOUE
  • Patent number: 11095388
    Abstract: The de-multiplexing unit 2 de-multiplexes an inputted optical wavelength multiplexed signal into a first optical wavelength multiplexed signal having a first wavelength band and a second optical wavelength multiplexed signal having a second wavelength band in a longer wavelength band than the first wavelength band. The first optical amplifier 3 amplifies the first optical wavelength multiplexed signal. The second optical amplifier 4 amplifies the second optical wavelength multiplexed signal. The multiplexer 5 multiplexes the amplified first optical wavelength multiplexed signal and the amplified second optical wavelength multiplexed signal and outputs the multiplexed signal to a Raman amplifier 6. The first optical amplifier 3 adjusts the amplification rate of the first optical wavelength multiplexed signal so that the intensity of light in the second wavelength band is compensated for by the Raman effect in the Raman amplifier 6.
    Type: Grant
    Filed: September 18, 2018
    Date of Patent: August 17, 2021
    Assignee: NEC CORPORATION
    Inventor: Yoshihisa Inada
  • Patent number: 11082144
    Abstract: An optical transmission system includes: a terminal station device that transmits a wavelength multiplexed optical signal resulting from multiplexing an optical signal and dummy light; and an optical add-drop multiplexer that receives respective wavelength multiplexed optical signals transmitted from a plurality of the terminal station devices and performs add-drop processing on the wavelength multiplexed optical signals. The dummy light has a wavelength arrangement in which adjacent wavelengths are arranged with equal spacing, and the wavelength arrangement of the dummy light differs between the terminal station devices.
    Type: Grant
    Filed: January 11, 2019
    Date of Patent: August 3, 2021
    Assignee: NEC CORPORATION
    Inventor: Yoshihisa Inada
  • Patent number: 11043786
    Abstract: Aspects of the present disclosure describe systems, methods, and structures that advantageously amplify optical signals through the effect of optical pump signals generated by a multicore laser diode and multicore rare-earth doped optical fiber in optical communication with a 3D waveguide structure and a multicore input signal fiber providing a plurality of optical signals for amplification.
    Type: Grant
    Filed: April 18, 2018
    Date of Patent: June 22, 2021
    Inventors: Fatih Yaman, Shaoliang Zhang, Eduardo Mateo Rodriguez, Kohei Nakamura, Yoshihisa Inada, Takanori Inoue
  • Publication number: 20200403383
    Abstract: Aspects of the present disclosure describe systems, methods and structures for providing semiconductor amplifiers exhibiting a low polarization-dependent gain.
    Type: Application
    Filed: June 17, 2020
    Publication date: December 24, 2020
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Fatih YAMAN, Shinsuke FUJISAWA, Eduardo Mateo RODRIGUEZ, Kohei NAKAMURA, Takanori INOUE, Yoshihisa INADA, Takaaki OGATA
  • Patent number: 10833770
    Abstract: Aspects of the present disclosure describe systems, methods and structures for optical fiber nonlinearity compensation using neural networks that advantageously employ machine learning (ML) algorithms for nonlinearity compensation (NLC) that advantageously provide a system-agnostic model independent of link parameters, and yet still achieve a similar or better performance at a lower complexity as compared with prior-art methods. Systems, methods, and structures according to aspects of the present disclosure include a data-driven model using the neural network (NN) to predict received signal nonlinearity without prior knowledge of the link parameters. Operationally, the NN is provided with intra-channel cross-phase modulation (IXPM) and intra-channel four-wave mixing (IFWM) triplets that advantageously provide a more direct pathway to underlying nonlinear interactions.
    Type: Grant
    Filed: June 21, 2019
    Date of Patent: November 10, 2020
    Assignee: NEC Corporation
    Inventors: Shaoliang Zhang, Fatih Yaman, Eduardo Rodriguez, Yoshihisa Inada, Kohei Nakamura, Takanori Inoue
  • Publication number: 20200313790
    Abstract: The de-multiplexing unit 2 de-multiplexes an inputted optical wavelength multiplexed signal into a first optical wavelength multiplexed signal having a first wavelength band and a second optical wavelength multiplexed signal having a second wavelength band in a longer wavelength band than the first wavelength band. The first optical amplifier 3 amplifies the first optical wavelength multiplexed signal. The second optical amplifier 4 amplifies the second optical wavelength multiplexed signal. The multiplexer 5 multiplexes the amplified first optical wavelength multiplexed signal and the amplified second optical wavelength multiplexed signal and outputs the multiplexed signal to a Raman amplifier 6. The first optical amplifier 3 adjusts the amplification rate of the first optical wavelength multiplexed signal so that the intensity of light in the second wavelength band is compensated for by the Raman effect in the Raman amplifier 6.
    Type: Application
    Filed: September 18, 2018
    Publication date: October 1, 2020
    Applicant: NEC Corporation
    Inventor: Yoshihisa INADA
  • Patent number: 10708094
    Abstract: Systems and methods for transmission filtering are provided. A receiver includes an input coupled to a transmission line to receive distorted optical symbols. A distortion filter is coupled to the input to replace the distorted optical symbols with predicted symbols using a trained neural network. A decoder is coupled to the distortion filter to decode the predicted symbols.
    Type: Grant
    Filed: October 5, 2018
    Date of Patent: July 7, 2020
    Assignee: NEC Corporation
    Inventors: Fatih Yaman, Shaoliang Zhang, Eduardo Mateo Rodriguez, Yoshihisa Inada, Yue-Kai Huang, Weiyang Mo
  • Patent number: 10581216
    Abstract: An optical communication substrate includes a plurality of cores to communicate optical signals; a rectangular input delivering a pump laser, and a shaped portion to combine the optical signals and the pump laser into a ring geometry at an output.
    Type: Grant
    Filed: May 3, 2017
    Date of Patent: March 3, 2020
    Assignee: NEC Corporation
    Inventors: Fatih Yaman, Shaoliang Zhang, Eduardo Mateo Rodriquez, Takanori Inoue, Yoshihisa Inada, Takaaki Ogata
  • Publication number: 20190393965
    Abstract: Aspects of the present disclosure describe systems, methods and structures for optical fiber nonlinearity compensation using neural networks that advantageously employ machine learning (ML) algorithms for nonlinearity compensation (NLC) that advantageously provide a system-agnostic model independent of link parameters, and yet still achieve a similar or better performance at a lower complexity as compared with prior-art methods. Systems, methods, and structures according to aspects of the present disclosure include a data-driven model using the neural network (NN) to predict received signal nonlinearity without prior knowledge of the link parameters. Operationally, the NN is provided with intra-channel cross-phase modulation (IXPM) and intra-channel four-wave mixing (IFWM) triplets that advantageously provide a more direct pathway to underlying nonlinear interactions.
    Type: Application
    Filed: June 21, 2019
    Publication date: December 26, 2019
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Shaoliang ZHANG, Fatih YAMAN, Eduardo RODRIGUEZ, Yoshihisa INADA, Kohei NAKAMURA, Takanori INOUE
  • Publication number: 20190280452
    Abstract: An optical amplification device is provided for supplying pump light with different distribution ratio to a plurality of optical fiber amplifiers with high reliability. The optical amplification device includes: a plurality of optical fiber amplifiers (102, 112); and an asymmetric coupling optical system (100) configure to input a plurality of pump light beams (P1, P2) and output a plurality of branched pump light beams (P12_C, P12_D) which are supplied respectively to the plurality of optical fiber amplifiers, the asymmetric coupling optical system including at least one asymmetric coupler (100) of 2-input, 2-output type having a predetermined asymmetric branching ratio, wherein a desired intensity difference between the plurality of branched pump light beams is set by adjusting an intensity of at least one input light beam of the asymmetric coupler.
    Type: Application
    Filed: November 27, 2017
    Publication date: September 12, 2019
    Applicant: NEC Corporation
    Inventor: Yoshihisa INADA
  • Patent number: 10401564
    Abstract: Aspects of the present disclosure describe fiber nonlinearity induced transmission penalties are reduced both in fibers with large polarization-mode dispersion, and in coupled-core multicore fibers (CC-MCF). In the case of coupled multi-core fibers, the requirement for modal delay is less.
    Type: Grant
    Filed: October 9, 2018
    Date of Patent: September 3, 2019
    Assignee: NEC CORPORATION
    Inventors: Fatih Yaman, Shaoliang Zhang, Eduardo Mateo Rodriguez, Takanori Inoue, Kohei Nakamura, Yoshihisa Inada, Takaaki Ogata
  • Publication number: 20190266480
    Abstract: Aspects of the present disclosure describe a method for digital coherent transmission systems that advantageously provides low-complexity, single-step nonlinearity compensation based on artificial intelligence (AI) implemented in a deep neuron network (DNN).
    Type: Application
    Filed: February 26, 2019
    Publication date: August 29, 2019
    Applicant: NEC LABORATORIES AMERICA, INC
    Inventors: Shaoliang ZHANG, Fatih YAMAN, Ting WANG, Eduardo RODRIGUEZ, Yoshihisa INADA, Kohei NAKAMURA, Takanori INOUE
  • Patent number: 10382138
    Abstract: Aspects of the present disclosure describe methods of generating an optimized set of constellation symbols for an optical transmission network wherein the optimized constellation is based on GMI cost and considers both fiber nonlinearity and linear transmission noise.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: August 13, 2019
    Assignee: NEC CORPORATION
    Inventors: Shaoliang Zhang, Fatih Yaman, Eduardo Mateo Rodriguez, Yoshihisa Inada