Patents by Inventor Alexander D. Cramer

Alexander D. Cramer 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).

  • RF system with stimulated Brillouin scattering (SBS) photonic equalizer and related methods
    Patent number: 10887015
    Abstract: A radio frequency (RF) photonic equalizer may include a first electro-optic (E/O) modulator configured to modulate an optical carrier based upon an RF input signal, a stimulated Brillouin scattering (SBS) medium coupled to the first E/O modulator, and a second E/O modulator configured to modulate the optical carrier based upon an equalizing function waveform. An optical circulator may be coupled to the SBS medium and the second E/O modulator, and a photodetector may be coupled to the optical circulator.
    Type: Grant
    Filed: April 20, 2018
    Date of Patent: January 5, 2021
    Assignee: EAGLE TECHNOLOGY, LLC
    Inventors: Charles F. Middleton, Anthony C. Klee, Elliott J. Grafer, John Richard Desalvo, Alexander D. Cramer
  • RF frequency converter with SBS equalization and related methods
    Patent number: 10511387
    Abstract: An RF frequency converter with equalization may include a first E/O modulator configured to modulate an optical carrier signal based upon an RF input signal having a first frequency, and a SBS medium coupled to the first E/O modulator. The RF frequency converter may have a second E/O modulator configured to modulate the optical carrier signal based upon an equalizing function waveform, and a third E/O modulator coupled between the first E/O modulator and the SBS medium. The third E/O modulator may be configured to modulate the optical carrier signal with a reference signal. The RF frequency converter may include an optical circulator coupled to the SBS medium and the second E/O modulator, and a photodetector coupled to the optical circulator and configured to generate an equalized RF output signal having a replica of the RF input signal at a second frequency based upon the reference signal.
    Type: Grant
    Filed: February 20, 2019
    Date of Patent: December 17, 2019
    Assignee: EAGLE TECHNOLOGY, LLC
    Inventors: Charles F. Middleton, IV, John R. Desalvo, Elliott J. Grafer, Anthony C. Klee, Alexander D. Cramer, George W. Miles, IV
  • RF SYSTEM WITH STIMULATED BRILLOUIN SCATTERING (SBS) PHOTONIC EQUALIZER AND RELATED METHODS
    Publication number: 20190326990
    Abstract: A radio frequency (RF) photonic equalizer may include a first electro-optic (E/O) modulator configured to modulate an optical carrier based upon an RF input signal, a stimulated Brillouin scattering (SBS) medium coupled to the first E/O modulator, and a second E/O modulator configured to modulate the optical carrier based upon an equalizing function waveform. An optical circulator may be coupled to the SBS medium and the second E/O modulator, and a photodetector may be coupled to the optical circulator.
    Type: Application
    Filed: April 20, 2018
    Publication date: October 24, 2019
    Inventors: Charles F. Middleton, Anthony C. Klee, Elliott J. Grafer, John Richard Desalvo, Alexander D. Cramer