Patents by Inventor Takatoshi Minami

Takatoshi Minami 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 modulator for an optical transmitter
    Patent number: 5359449
    Abstract: An optical transmitter having a Mach-Zehnder optical modulator comprising a signal electrode fed with a driving signal for effecting modulation and a bias electrode for operating point control. Because the signal electrode and the bias electrode are independent of each other, a driving circuit and the signal electrode can be connected in a DC setup. This permits stable operating point control and improves waveform characteristics.
    Type: Grant
    Filed: November 19, 1992
    Date of Patent: October 25, 1994
    Assignee: Fujitsu Limited
    Inventors: Hiroshi Nishimoto, Hironao Hakogi, Takatoshi Minami
  • Light receiving automatic gain control circuit
    Patent number: 4495410
    Abstract: Circuitry for optimizing the signal-to-noise ratio of a light receiving circuit having an avalanche photo diode to receive the light and an amplifier connected thereto to provide an output signal, the level of the output signal being kept constant despite variations in the light input level by controlling the multiplication factor of the avalanche photo diode and the gain of the amplifier. For this purpose, when the light input level is low, the multiplication factor control voltage for the avalanche photo diode is controlled through a loop which includes a differential amplifier, a diode, and a high voltage generator circuit.
    Type: Grant
    Filed: February 5, 1982
    Date of Patent: January 22, 1985
    Assignee: Fujitsu Limited
    Inventors: Takatoshi Minami, Hiroshi Nishimoto