Patents by Inventor Hidehiko Shibuya

Hidehiko Shibuya 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).

  • Synchronization transport over passive optical networks
    Patent number: 8942561
    Abstract: One embodiment provides an Ethernet Passive Optical Network (EPON) system for clock transport. The system includes a reference clock configured to generate a frequency-reference signal, an optical line terminal (OLT) coupled to the reference clock, and an optical network unit (ONU). The OLT includes a clock generator configured to generate an OLT clock based on at least the frequency-reference signal. The ONU includes an optical transceiver, a clock recovery module, and a clock output mechanism. The optical transceiver is configured to transmit optical signals to and receive optical signals from the OLT. The clock-recovery module is configured to recover the frequency-reference signal from the received optical signals. The clock output mechanism is configured to output the recovered frequency-reference signal, thus facilitating transport of the frequency-reference signal over the EPON.
    Type: Grant
    Filed: October 6, 2009
    Date of Patent: January 27, 2015
    Assignee: Broadcom Corporation
    Inventors: Edward W. Boyd, Hidehiko Shibuya
  • SYNCHRONIZATION TRANSPORT OVER PASSIVE OPTICAL NETWORKS
    Publication number: 20100098433
    Abstract: One embodiment provides an Ethernet Passive Optical Network (EPON) system for clock transport. The system includes a reference clock configured to generate a frequency-reference signal, an optical line terminal (OLT) coupled to the reference clock, and an optical network unit (ONU). The OLT includes a clock generator configured to generate an OLT clock based on at least the frequency-reference signal. The ONU includes an optical transceiver, a clock recovery module, and a clock output mechanism. The optical transceiver is configured to transmit optical signals to and receive optical signals from the OLT. The clock-recovery module is configured to recover the frequency-reference signal from the received optical signals. The clock output mechanism is configured to output the recovered frequency-reference signal, thus facilitating transport of the frequency-reference signal over the EPON.
    Type: Application
    Filed: October 6, 2009
    Publication date: April 22, 2010
    Applicant: TEKNOVUS, INC.
    Inventors: Edward W. Boyd, Hidehiko Shibuya