Patents by Inventor Lynn C. Chapman

Lynn C. Chapman 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).

  • Feedback circuit for controlling the peak optical output power of an injection laser
    Patent number: 4412331
    Abstract: An injection laser is turned on and off in response to DATA and DATA control signals. A photodiode is irradiated by the laser and passes current that is proportional to the intensity of the laser radiation. A current switch responds to the DATA signal to define a current path for the source current of associated source current transistors when the laser is on. A difference current, corresponding to the difference between the photodiode current and the source current, is then applied to an integrator. The integrator generates an error signal corresponding to the difference in charge transfer between the photodiode and the source current transistors. The error signal is applied to operate a bias transistor that generates a corresponding DC bias current for the laser.
    Type: Grant
    Filed: April 22, 1981
    Date of Patent: October 25, 1983
    Assignee: M/A-COM DCC, Inc.
    Inventor: Lynn C. Chapman
  • Feedback circuit for controlling the peak optical output power of an injection laser
    Patent number: 4305047
    Abstract: An injection laser is turned on and off in response to DATA and DATA control signals. A photodiode is irradiated by the laser and passes current that is proportional to the intensity of the laser radiation. A current switch responds to the DATA signal to define a current path for the source current of associated source current transistors when the laser is on. A difference current, corresponding to the difference between the photodiode current and the source current, is then applied to an integrator. The integrator generates an error signal corresponding to the difference in charge transfer between the photodiode and the source current transistors. The error signal is applied to operate a bias transistor that generates a corresponding DC bias current for the turned on laser.
    Type: Grant
    Filed: October 9, 1979
    Date of Patent: December 8, 1981
    Assignee: Digital Communications Corp.
    Inventors: Lynn C. Chapman, David W. Matthews, John Giganti