Patents by Inventor Youichi Nishizato

Youichi Nishizato 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).

  • Optical wavelength multiplexer/demultiplexer
    Patent number: 10983274
    Abstract: A broadband optical wavelength multiplexer/demultiplexer is provided. Two waveguides are arranged such that, in a case where a connection position where one of the two waveguides is connected to a first slab waveguide is set closer to the other waveguide by a channel frequency interval ?f, a central position between the two waveguides aligns with a central position on a connection end surface of the first slab waveguide, and two waveguide groups of an output waveguide are arranged such that a central position between the two waveguide groups aligns with a central position of a second slab waveguide, and an interval between a connection position where the other waveguide is connected to the first slab waveguide and the central position on the connection end surface of the first slab waveguide is set equal to an interval between a connection position where the waveguide groups are connected to the second slab waveguide.
    Type: Grant
    Filed: November 21, 2018
    Date of Patent: April 20, 2021
    Assignee: NTT ELECTRONICS CORPORATION
    Inventors: Daisuke Ogawa, Youichi Nishizato
  • Optical Wavelength Multiplexer/Demultiplexer
    Publication number: 20200386942
    Abstract: A broadband optical wavelength multiplexer/demultiplexer is provided. Two waveguides are arranged such that, in a case where a connection position where one of the two waveguides is connected to a first slab waveguide is set closer to the other waveguide by a channel frequency interval ?f, a central position between the two waveguides aligns with a central position on a connection end surface of the first slab waveguide, and two waveguide groups of an output waveguide are arranged such that a central position between the two waveguide groups aligns with a central position of a second slab waveguide, and an interval between a connection position where the other waveguide is connected to the first slab waveguide and the central position on the connection end surface of the first slab waveguide is set equal to an interval between a connection position where the waveguide groups are connected to the second slab waveguide.
    Type: Application
    Filed: November 21, 2018
    Publication date: December 10, 2020
    Inventors: Daisuke Ogawa, Youichi Nishizato