Patents by Inventor Katsuhiro Yutani

Katsuhiro Yutani 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 with external modulator, optical transceiver including optical transmitter with external modulator, and methods of driving the same
    Patent number: 7672597
    Abstract: An optical transmitter with an external modulator includes a light-emitting unit emitting a continuous wave light, a modulation unit modulating the continuous wave light in accordance with an electric signal, a first terminal applying a first positive voltage to a cathode of the light-emitting unit and a cathode of the modulation unit, a second terminal applying a second positive voltage of a constant value to an anode of the light-emitting unit, and a third terminal applying a third positive voltage with the electric signal to an anode of the modulation unit. The second positive voltage is set to a value higher than the first positive voltage, and the third positive voltage is set to a value lower than the first positive voltage.
    Type: Grant
    Filed: March 23, 2007
    Date of Patent: March 2, 2010
    Assignee: NEC Corporation
    Inventor: Katsuhiro Yutani
  • TRANSCEIVER FOR OPTICAL TRANSMISSION AND TRANSMISSION METHOD FOR THE SAME
    Publication number: 20080232813
    Abstract: The present invention provides a transceiver for optical transmission in which noise can be sufficiently suppressed and a method for the same using a simple configuration. The transceiver includes an optical transmitter module in which a low frequency obtained by boosting and filtering a power-source voltage is superimposed onto and LD drive current.
    Type: Application
    Filed: March 19, 2008
    Publication date: September 25, 2008
    Inventor: KATSUHIRO YUTANI
  • Optical transmitter with external modulator, optical transceiver including optical transmitter with external modulator, and methods of driving the same
    Publication number: 20070230969
    Abstract: An optical transmitter with an external modulator includes a light-emitting unit emitting a continuous wave light, a modulation unit modulating the continuous wave light in accordance with an electric signal, a first terminal applying a first positive voltage to a cathode of the light-emitting unit and a cathode of the modulation unit, a second terminal applying a second positive voltage of a constant value to an anode of the light-emitting unit, and a third terminal applying a third positive voltage with the electric signal to an anode of the modulation unit. The second positive voltage is set to a value higher than the first positive voltage, and the third positive voltage is set to a value lower than the first positive voltage.
    Type: Application
    Filed: March 23, 2007
    Publication date: October 4, 2007
    Inventor: Katsuhiro Yutani