Patents by Inventor Tsutomu Aiba

Tsutomu Aiba 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).

  • Communications apparatus, multiplex communications apparatus, communications system, and communication method
    Patent number: 9191145
    Abstract: A communications apparatus includes a transmitter that transmits signal light that is wavelength division multiplexed with other signal light and that is to be transmitted to an opposing apparatus, and a processor that is operative to change a frequency of the signal light to be transmitted by the transmitter based on detection results at the opposing apparatus and concerning variation in the frequency of the transmitted signal light.
    Type: Grant
    Filed: October 25, 2011
    Date of Patent: November 17, 2015
    Assignees: FUJITSU LIMITED, NTT ELECTRONICS CORPORATION
    Inventors: Hiroshi Ogiwara, Tsutomu Aiba, Shigeru Ono, Kouichi Ogihara
  • Light transmitting and receiving module, method for managing the same, light transmitting and receiving apparatus, and wavelength-multiplexing light transmitting and receiving apparatus
    Patent number: 8396362
    Abstract: The light transmitting and receiving module includes a light outputting section; alight receiver which receives input light and which outputs an electric signal having an intensity corresponding to a light intensity of the input light; a first variably attenuation controller which variably attenuates the light output from the light outputting section; a second variably attenuation controller which variably attenuates the input light to the light receiver; a first switch which selectively switches a path through which the light from the first variably attenuation controller is output between a light transmitting path and an alternative path different from the light transmitting path; and a second switch which selectively switches light to be output to the second variably attenuation controller between light from an external entity and the light through the alternative path of the first switch.
    Type: Grant
    Filed: April 30, 2010
    Date of Patent: March 12, 2013
    Assignee: Fujitsu Limited
    Inventors: Yuichi Nagaki, Tsutomu Aiba
  • Communications apparatus, multiplex communications apparatus, communications system, and communication method
    Publication number: 20120106969
    Abstract: A communications apparatus includes a transmitter that transmits signal light that is wavelength division multiplexed with other signal light and that is to be transmitted to an opposing apparatus, and a processor that is operative to change a frequency of the signal light to be transmitted by the transmitter based on detection results at the opposing apparatus and concerning variation in the frequency of the transmitted signal light.
    Type: Application
    Filed: October 25, 2011
    Publication date: May 3, 2012
    Applicants: NTT Electronics Corporation, FUJITSU LIMITED
    Inventors: Hiroshi Ogiwara, Tsutomu Aiba, Shigeru Ono, Kouichi Ogihara
  • LIGHT TRANSMITTING AND RECEIVING MODULE, AND METHOD FOR MANAGING THE SAME, LIGHT TRANSMITTING AND RECEIVING APPARATUS, AND WAVELENGTH-MULTIPLEXING LIGHT TRANSMITTING AND RECEIVING APPARATUS
    Publication number: 20100209113
    Abstract: The light transmitting and receiving module includes a light outputting section; alight receiver which receives input light and which outputs an electric signal having an intensity corresponding to a light intensity of the input light; a first variably attenuation controller which variably attenuates the light output from the light outputting section; a second variably attenuation controller which variably attenuates the input light to the light receiver; a first switch which selectively switches a path through which the light from the first variably attenuation controller is output between a light transmitting path and an alternative path different from the light transmitting path; and a second switch which selectively switches light to be output to the second variably attenuation controller between light from an external entity and the light through the alternative path of the first switch.
    Type: Application
    Filed: April 30, 2010
    Publication date: August 19, 2010
    Applicant: Fujitsu Limited
    Inventors: Yuichi NAGAKI, Tsutomu AIBA
  • Optical transmission device and redundant switch method for the optical transmission device
    Publication number: 20080075468
    Abstract: When switching over of a first optical transmitting section and a second optical transmitting section is performed, a monitor signal from a monitor section of each of the first optical transmitting section and the second optical transmitting section is supervised. Then, on the basis of each of the monitor signal, an optical switch section provided in each of the first optical transmitting section and the second optical transmitting section is controlled, and an optical level adjusting section provided in each of the first optical transmitting section and the second optical transmitting section is controlled.
    Type: Application
    Filed: March 6, 2007
    Publication date: March 27, 2008
    Inventors: Tsutomu Aiba, Yuichi Nagaki