Patents by Inventor Keita KIYOSHIMA

Keita KIYOSHIMA 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: 20230170996
    Abstract: Provided is an optical transmission system that performs RoF transmission of an RF signal. The optical transmission system includes an electro-optical conversion device for receiving an RF signal, converting the RF signal into an optical signal, and transmitting the optical signal; a multimode optical fiber for transmitting the optical signal transmitted from the electro-optical conversion device; and an opto-electrical conversion device for converting the optical signal transmitted from the optical fiber into an RF signal and transmitting the RF signal. The optical fiber has a numerical aperture (NA) of 0.13 or more and 0.22 or less.
    Type: Application
    Filed: April 7, 2021
    Publication date: June 1, 2023
    Applicant: NITTO DENKO CORPORATION
    Inventors: Yuichi TSUJITA, Kazumasa OKADA, Takeshi TANAKA, Keita KIYOSHIMA, Yoshinori OSAKI
  • Patent number: 11598924
    Abstract: An optical connector assembly having a connector housing with a first and second end. First end accepts a ferrule assembly, and second end accepts a retention assembly. There is a longitudinal bore from a distal to proximal end of connector. Bore accepts a POF optical fiber therein at distal end and fiber is inserted proximally until fiber bottoms-out at proximal end of ferrule. Retention body accepts one or more retention caps, or retention body contains at least one retention wing set to secure fiber to connector.
    Type: Grant
    Filed: July 20, 2021
    Date of Patent: March 7, 2023
    Assignees: Senko Advanced Components, Inc., Nitto Denko Corporation
    Inventors: Kazumasa Okada, Yuichi Tsujita, Keita Kiyoshima, Kenji Iizumi, Yuki Nishiguchi, Kazuyoshi Takano
  • Patent number: 11411648
    Abstract: An optical transmission system transmits a Radio Frequency (RF) signal by a frequency division multiplexing method. The optical transmission system includes a Transmitter Optical SubAssembly (TOSA), an optical fiber, and a Receiver Optical SubAssembly (ROSA). The TOSA includes a surface emitting laser diode configured to be capable of emitting light at output of 0.8 mW or more. In the optical transmission system including the surface emitting laser diode, a noise index obtained by a measurement method including a predetermined step is 10.0 dB?V or less.
    Type: Grant
    Filed: November 28, 2019
    Date of Patent: August 9, 2022
    Assignees: NITTO DENKO CORPORATION
    Inventors: Yuichi Tsujita, Takeshi Tanaka, Satoshi Ito, Keita Kiyoshima, Atsushi Yamagishi, Yasuhiro Koike, Azusa Inoue
  • Publication number: 20220221651
    Abstract: A cutting jig includes a fixing member for inserting a distal end portion of an optical fiber, and an inclination cutting unit movable with respect to the fixing member for cutting the distal end portion. The distal end portion is defined into a proximal end portion and a free end portion. The inclination cutting unit includes a one end edge of a closing plate and a blade portion incapable of relative movement to each other. The inclination cutting unit can perform a first movement and a second movement that is a greater movement amount than the first movement. The one end edge is brought into contact with the free end portion based on the first movement, and the free end portion moves to be inclined with respect to an extension line EL. A blade edge is brought into contact with the free end portion based on the second movement.
    Type: Application
    Filed: May 21, 2020
    Publication date: July 14, 2022
    Applicant: NITTO DENKO CORPORATION
    Inventors: Kazumasa OKADA, Keita KIYOSHIMA, Yuichi TSUJITA
  • Publication number: 20220045756
    Abstract: An optical transmission system transmits a Radio Frequency (RF) signal by a frequency division multiplexing method. The optical transmission system includes a Transmitter Optical SubAssembly (TOSA), an optical fiber, and a Receiver Optical SubAssembly (ROSA). The TOSA includes a surface emitting laser diode configured to be capable of emitting light at output of 0.8 mW or more. In the optical transmission system including the surface emitting laser diode, a noise index obtained by a measurement method including a predetermined step is 10.0 dB?V or less.
    Type: Application
    Filed: November 28, 2019
    Publication date: February 10, 2022
    Applicants: NITTO DENKO CORPORATION
    Inventors: Yuichi TSUJITA, Satoshi ITO, Takeshi TANAKA, Keita KIYOSHIMA, Atsushi YAMAGISHI, Yasuhiro KOIKE, Azusa INOUE
  • Publication number: 20210349270
    Abstract: An optical connector assembly having a connector housing with a first and second end. First end accepts a ferrule assembly, and second end accepts a retention assembly. There is a longitudinal bore from a distal to proximal end of connector. Bore accepts a POF optical fiber therein at distal end and fiber is inserted proximally until fiber bottoms-out at proximal end of ferrule. Retention body accepts one or more retention caps, or retention body contains at least one retention wing set to secure fiber to connector.
    Type: Application
    Filed: July 20, 2021
    Publication date: November 11, 2021
    Inventors: Kazumasa OKADA, Yuichi TSUJITA, Keita = KIYOSHIMA, Kenji IIZUMI, Yuki NISHIGUCHI, Kazuyoshi TAKANO
  • Patent number: 11099334
    Abstract: An optical connector assembly having a connector housing with a first and second end. First end accepts a ferrule assembly, and second end accepts a retention assembly. There is a longitudinal bore from a distal to proximal end of connector. Bore accepts a POF optical fiber therein at distal end and fiber is inserted proximally until fiber bottoms-out at proximal end of ferrule. Retention body accepts one or more retention caps, or retention body contains at least one retention wing set to secure fiber to connector.
    Type: Grant
    Filed: August 5, 2019
    Date of Patent: August 24, 2021
    Assignees: Senko Advanced Components, Inc., Nitto Denko Corporation
    Inventors: Kazumasa Okada, Yuichi Tsujita, Keita Kiyoshima, Kenji Iizumi, Yuki Nishiguchi, Kazuyoshi Takano
  • Publication number: 20200049903
    Abstract: An optical connector assembly having a connector housing with a first and second end. First end accepts a ferrule assembly, and second end accepts a retention assembly. There is a longitudinal bore from a distal to proximal end of connector. Bore accepts a POF optical fiber therein at distal end and fiber is inserted proximally until fiber bottoms-out at proximal end of ferrule. Retention body accepts one or more retention caps, or retention body contains at least one retention wing set to secure fiber to connector.
    Type: Application
    Filed: August 5, 2019
    Publication date: February 13, 2020
    Inventors: Kazumasa OKADA, Yuichi TSUJITA, Keita KIYOSHIMA, Kenji IIZUMI, Yuki NISHIGUCHI, Kazuyoshi TAKANO