Patents by Inventor Yusuke Ota

Yusuke Ota 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).

  • Patent number: 5430766
    Abstract: A dc-coupled packet mode digital data receiver, for use with an optical bus uses peak detectors to adaptively establish an instantaneous logic threshold at the beginning of a data burst. A dc compensator, responsive to outputs of the peak detectors, shunts dc or low frequency currents, corresponding to "dark level" optical signals, from the input of the receiver.
    Type: Grant
    Filed: August 22, 1994
    Date of Patent: July 4, 1995
    Assignee: AT&T Corp.
    Inventors: Yusuke Ota, Robert G. Swartz
  • Patent number: 5371763
    Abstract: A dc-coupled packet mode digital data receiver, for use with an optical bus, uses a peak detector(s) to adaptively establish an instantaneous logic threshold at the beginning of a data burst. A reset circuit resets the peak detector(s) and other circuits of the receiver in response to an end-of-packet reset signal, thereby enabling the reception of closely-spaced burst date packets which have greatly differing power levels.
    Type: Grant
    Filed: November 13, 1992
    Date of Patent: December 6, 1994
    Assignee: AT&T Corp.
    Inventors: Yusuke Ota, Robert G. Swartz
  • Patent number: 5025456
    Abstract: A burst mode digital data receiver automatically adjusts its logic reference voltage to be equal to one-half of the sum of the minimum and maximum excursions of a received data signal. The receiver includes a differential amplifier circuit which has a first input for receiving the data signal and a second input connected to a voltage reference circuit. The voltage reference circuit is responsive to an output signal from the amplifier circuit to produce the required logic reference voltage at the second input to the amplifier circuit by generating a feedback signal which causes the amplifier circuit to have a first gain value during the absence of the data signal and while the data signal is less than its peak amplitude and a second gain value approximately twice the first gain value for a predetermined time after the peak amplitude of the data signal is reached.
    Type: Grant
    Filed: February 2, 1989
    Date of Patent: June 18, 1991
    Assignee: AT&T Bell Laboratories
    Inventors: Yusuke Ota, Robert G. Swartz
  • Patent number: 4756590
    Abstract: Disclosed is an optical package including at least one electro-optical component aligned with at least one optical fiber. The electro-optical component is mounted on a surface which is essentially parallel to, but not coplanar with, the longitudinal axis of the fiber and light is coupled between the fiber and component by bending the light path. Electrical connection to the component is provided by conductors mounted over the same surface, thus producing a compact package. The invention is used preferably with arrays of components and fibers to eliminate the need for a vertical fanout to contact the components.
    Type: Grant
    Filed: September 3, 1985
    Date of Patent: July 12, 1988
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Stephen R. Forrest, Yusuke Ota
  • Patent number: 4730198
    Abstract: Linear arrays of optical fibers are aligned to linear arrays of optoelectronic devices (e.g., photodiodes, diode lasers or LEDs) formed on an elongated chip. The alignment procedure results in a subassembly which includes fiber segments embedded between V-groove mounting blocks and the device array chip affixed to an end face of the blocks.
    Type: Grant
    Filed: November 26, 1984
    Date of Patent: March 8, 1988
    Assignee: American Telephone and Telegraph Company, AT&T Bell Laboratories
    Inventors: Michael G. Brown, Stephen R. Forrest, Daniel R. Kaplan, Paul A. Kohl, Yusuke Ota, Harvey S. Trop
  • Patent number: 4226648
    Abstract: A semiconductor varactor diode of the hyperabrupt junction type, typically having a PNN+ configuration, is disclosed. The impurity concentration in the intermediate N-type portion is grown in by the molecular beam epitaxy process to provide the hyperabrupt profile. Also, the N-type background doping in the P-type zone is minimized by the same epitaxial process to reduce the level of impurity compensation needed.
    Type: Grant
    Filed: March 16, 1979
    Date of Patent: October 7, 1980
    Assignee: Bell Telephone Laboratories, Incorporated
    Inventors: Charles A. Goodwin, Yusuke Ota