Patents by Inventor Robert James Lewandowski

Robert James Lewandowski 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).

  • Automatic control of laser diode current and optical power output
    Patent number: 7423247
    Abstract: An automatic power control system provides a control signal that regulates the output power of at least one laser diode. Coarse adjustment of the control signal is provided by a first means, preferably a digital variable resistor, while fine adjustment and compensation is provided by a second means, preferably by a digital-to-analog converter that receives an input signal proportional to a sensed control system parameter. The control system includes an operational amplifier having a first input coupled to sense output power, and a second input coupled to a DAC to provide finer resolution control. Memory can store system parameter or system parameter variations that can be coupled to the DAC and/or variable resistor to enhance system stability over ambient variations.
    Type: Grant
    Filed: January 23, 2007
    Date of Patent: September 9, 2008
    Assignee: Micrel, Incorporated
    Inventors: David Kunst, Steven Martinez, Robert James Lewandowski, Peter Chambers, Joseph James Judkins, Luis Torres, Thomas A. Lindsay
  • Automatic control of laser diode current and optical power output
    Patent number: 7166826
    Abstract: An automatic power control system provides a control signal that regulates the output power of at least one laser diode. Coarse adjustment of the control signal is provided by a first means, preferably a digital variable resistor, while fine adjustment and compensation is provided by a second means, preferably by a digital-to-analog converter that receives an input signal proportional to a sensed control system parameter. The control system includes an operational amplifier having a first input coupled to sense output power, and a second input coupled to a DAC to provide finer resolution control. Memory can store system parameter or system parameter variations that can be coupled to the DAC and/or variable resistor to enhance system stability over ambient variations.
    Type: Grant
    Filed: November 13, 2002
    Date of Patent: January 23, 2007
    Assignees: Micrel, Incorporated, Stratos Lightware, Inc.
    Inventors: David Kunst, Steven Martinez, Robert James Lewandowski, Peter Chambers, Joseph James Judkins, III, Luis Torres, Tom Lindsay