Patents by Inventor Chris Stook

Chris Stook 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 bias stabilization of dual-polarization in-phase and quadrature optical modulator
    Patent number: 9494810
    Abstract: Embodiments include a method and apparatus used for automatic bias stabilization of a DP IQM based on MZM for transmitting DP-QPSK optical data and/or DP-16QAM optical data. The apparatus simultaneously dithers DC-bias voltages of in-phase child, quadrature-phase child, and parent MZMs with three different dither patterns in time-domain which are mutually orthogonal to each other in the frequency-domain for X and Y polarization IQ modulators. Tap monitor photodiodes detect an interference term between these three dither patterns for each polarization. The interference term is sampled using an ADC in the time domain. The time-synchronous detection method may solve a set of three simultaneous linear partial differential equations with three unknowns to compute controlled DC-bias voltages to set on the respective MZM with a solution set which may iteratively converge to a unique solution, thereby biasing the child MZM in dual-polarization IQM to transmission minimum and parent MZM in quadrature transmission.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: November 15, 2016
    Assignee: FINISAR CORPORATION
    Inventors: Suhas P. Bhandare, Mark Colyar, David Meloche, Terence D. Grenda, Chris Stook, Heider N. Ereifej, John DeAndrea
  • AUTOMATIC BIAS STABILIZATION OF DUAL-POLARIZATION IN-PHASE AND QUADRATURE OPTICAL MODULATOR
    Publication number: 20160282638
    Abstract: Embodiments include a method and apparatus used for automatic bias stabilization of a DP IQM based on MZM for transmitting DP-QPSK optical data and/or DP-16 QAM optical data. The apparatus simultaneously dithers DC-bias voltages of in-phase child, quadrature-phase child, and parent MZMs with three different dither patterns in time-domain which are mutually orthogonal to each other in the frequency-domain for X and Y polarization IQ modulators. Tap monitor photodiodes detect an interference term between these three dither patterns for each polarization. The interference term is sampled using an ADC in the time domain. The time-synchronous detection method may solve a set of three simultaneous linear partial differential equations with three unknowns to compute controlled DC-bias voltages to set on the respective MZM with a solution set which may iteratively converge to a unique solution, thereby biasing the child MZM in dual-polarization IQM to transmission minimum and parent MZM in quadrature transmission.
    Type: Application
    Filed: March 24, 2016
    Publication date: September 29, 2016
    Inventors: Suhas P. Bhandare, Mark Colyar, David Meloche, Terence D. Grenda, Chris Stook, Heider N. Ereifej, John DeAndrea