Patents by Inventor Nobutaka Fuke

Nobutaka Fuke 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).

  • Variable optical dispersion compensating module
    Patent number: 7376300
    Abstract: The present invention provides a variable optical dispersion compensating module comprised of (a) an optical dispersion compensating unit having an input optical switch, an optical dispersion compensating fiber, connected to the optical switch, having a predetermined optical dispersion amount, a bypass path for bypassing the optical dispersion compensating fiber, and an output optical switch connected to the optical dispersion compensating fiber and the bypass path, (b) an optical dispersion compensating circuit with at least one of the unit connected in series, and (c) an optical attenuator provided, in the direction of an optical path, after the input optical switch or before the output optical switch of the optical dispersion compensating circuit.
    Type: Grant
    Filed: April 22, 2005
    Date of Patent: May 20, 2008
    Assignee: Furukawa Electric Co., Ltd.
    Inventors: Nobutaka Fuke, Shiro Nakamura, Jun Ishiguro, Hiroshi Raijo, Atsushi Umeda
  • Variable optical dispersion compensating module
    Publication number: 20050191018
    Abstract: The present invention provides a variable optical dispersion compensating module comprised of (a) an optical dispersion compensating unit having an input optical switch, an optical dispersion compensating fiber, connected to the optical switch, having a predetermined optical dispersion amount, a bypass path for bypassing the optical dispersion compensating fiber, and an output optical switch connected to the optical dispersion compensating fiber and the bypass path, (b) an optical dispersion compensating circuit with at least one of the unit connected in series, and (c) an optical attenuator provided, in the direction of an optical path, after the input optical switch or before the output optical switch of the optical dispersion compensating circuit.
    Type: Application
    Filed: April 22, 2005
    Publication date: September 1, 2005
    Inventors: Nobutaka Fuke, Shiro Nakamura, Jun Ishiguro, Hiroshi Raijo, Atsushi Umeda
  • Variable optical dispersion compensating module
    Publication number: 20030007725
    Abstract: The present invention provides a variable optical dispersion compensating module comprised of (a) an optical dispersion compensating unit having an input optical switch, an optical dispersion compensating fiber, connected to the optical switch, having a predetermined optical dispersion amount, a bypass path for bypassing the optical dispersion compensating fiber, and an output optical switch connected to the optical dispersion compensating fiber and the bypass path, (b) an optical dispersion compensating circuit with at least one of the unit connected in series, and (c) an optical attenuator provided, in the direction of an optical path, after the input optical switch or before the output optical switch of the optical dispersion compensating circuit.
    Type: Application
    Filed: May 15, 2002
    Publication date: January 9, 2003
    Inventors: Nobutaka Fuke, Shiro Nakamura, Jun Ishiguro, Hiroshi Raijo, Atsushi Umeda