Patents by Inventor Ken-ichi Yoneyama

Ken-ichi Yoneyama 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 transmitter and optical receiver for optical time division multiplexing transmission
    Patent number: 6178022
    Abstract: An optical transmitter for optical time-division multiplexing transmission where optical signals are intensity-modulated by data signals and then time-division-multiplexed to output an optically-time-division-multiplexed signal, the optical transmission having devised for superposing a low-frequency signal with a frequency proper to each of channels to be multiplexed on each of the optical signals corresponding to the each of channels by conducting a small quantity of intensity modulation, and an optical receiver for receiving the optically-time-division-multiplexed signal from the optical transmitter, the optical receiver having devices for identifying each of the channel by detecting the low frequency when the optically-time-division-multiplexed signal received is demultiplexed to each of the channels.
    Type: Grant
    Filed: December 9, 1997
    Date of Patent: January 23, 2001
    Assignee: NEC Corporation
    Inventor: Ken-ichi Yoneyama