Patents by Inventor Christopher E. Sunderman

Christopher E. Sunderman 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).

  • Even-order harmonic cancellation and increased RF gain using dual-output mach-zehnder modulator with two wavelength input
    Patent number: 8224188
    Abstract: A method and system for processing analog optical signals to produce a single RF output free from even-order harmonic distortion. Two analog optical signals of different wavelengths ?1, ?2 are input into a dual-output Mach-Zehnder modulator (MZM), where one wavelength input is high-biased and one wavelength is low-biased. The complementary high- and low-biased wavelengths are output from each arm of the MZM to a multiplexer, which filters out the unwanted high- or low-biased wavelengths from each MZM arm so that both wavelengths are low-biased or high-biased. The signals are passed to a pair of photodiodes, and the photocurrents from the photodiodes are differenced to produce the final RF output. Because of the complementary phase differences between the two low- or high-biased signals generating the photocurrent, all components of the photocurrent except the fundamental and odd-order harmonics cancel each other, resulting in a high-quality RF output free from harmonic distortion.
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: July 17, 2012
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventors: Preetpaul S Devgan, Vincent J Urick, Keith J Williams, John F. Diehl, Christopher E. Sunderman
  • Even-Order Harmonic Cancellation and Increased RF Gain Using Dual-Output Mach-Zehnder Modulator with Two Wavelength Input
    Publication number: 20100266289
    Abstract: A method and system for processing analog optical signals to produce a single RF output free from even-order harmonic distortion. Two analog optical signals of different wavelengths ?1, ?2 are input into a dual-output Mach-Zehnder modulator (MZM), where one wavelength input is high-biased and one wavelength is low-biased. The complementary high- and low-biased wavelengths are output from each arm of the MZM to a multiplexer, which filters out the unwanted high- or low-biased wavelengths from each MZM arm so that both wavelengths are low-biased or high-biased. The signals are passed to a pair of photodiodes, and the photocurrents from the photodiodes are differenced to produce the final RF output. Because of the complementary phase differences between the two low- or high-biased signals generating the photocurrent, all components of the photocurrent except the fundamental and odd-order harmonics cancel each other, resulting in a high-quality RF output free from harmonic distortion.
    Type: Application
    Filed: January 15, 2010
    Publication date: October 21, 2010
    Applicant: The Government of the US, as represented by the Secretary of the Navy
    Inventors: Preetpaul S. Devgan, Vincent J. Urick, Keith J. Williams, John F. Diehl, Christopher E. Sunderman