Patents by Inventor Josh KEMP

Josh KEMP 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).

  • Closed loop bias control for an IQ phase modulator
    Patent number: 10823987
    Abstract: An electro-optic device may include a Mach-Zehnder modulator (MZM) and one or more components. The one or more components may apply a DC bias with dither to a first branch and a second branch of the MZM and to arms of the first branch, and may determine a second harmonic of a first return signal. The one or more components may apply a DC bias with phase-shifted dither to the first branch and the second branch or to the arms of the first branch, and determine a second harmonic of a second return signal. The phase-shifted dither may be out of phase from the dither and have a frequency that matches a frequency of the dither. The one or more components may determine whether arms of the second branch of the MZM are operating at null, and may selectively adjust DC biases applied to the arms of the second branch.
    Type: Grant
    Filed: June 24, 2019
    Date of Patent: November 3, 2020
    Assignee: Lumentum Operations LLC
    Inventors: Dan Burke, Fredrik Sy, Josh Kemp
  • CLOSED LOOP BIAS CONTROL FOR AN IQ PHASE MODULATOR
    Publication number: 20190310497
    Abstract: An electro-optic device may include a Mach-Zehnder modulator (MZM) and one or more components. The one or more components may apply a DC bias with dither to a first branch and a second branch of the MZM and to arms of the first branch, and may determine a second harmonic of a first return signal. The one or more components may apply a DC bias with phase-shifted dither to the first branch and the second branch or to the arms of the first branch, and determine a second harmonic of a second return signal. The phase-shifted dither may be out of phase from the dither and have a frequency that matches a frequency of the dither. The one or more components may determine whether arms of the second branch of the MZM are operating at null, and may selectively adjust DC biases applied to the arms of the second branch.
    Type: Application
    Filed: June 24, 2019
    Publication date: October 10, 2019
    Inventors: Dan BURKE, Fredrik SY, Josh KEMP