Patents by Inventor Stephen A. Pappert

Stephen A. Pappert 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).

  • High power, optically-linearized microwave fiber optic link with suppression of fiber induced distortion
    Patent number: 7570888
    Abstract: Techniques and system implementations for fiber optic transmission systems for suppressing fiber induced distortions and modulation-induced distortions as well as increasing the link power and RF gain.
    Type: Grant
    Filed: November 25, 2008
    Date of Patent: August 4, 2009
    Assignee: Cisco Technology, Inc.
    Inventors: Stephen A Pappert, Chen-Kuo Sun, Richard J Orazi
  • High Power, Optically-Linearized Microwave Fiber Optic Link with Suppression of Fiber Induced Distortion
    Publication number: 20090074419
    Abstract: Techniques and system implementations for fiber optic transmission systems for suppressing fiber induced distortions and modulation-induced distortions as well as increasing the link power and RF gain.
    Type: Application
    Filed: November 25, 2008
    Publication date: March 19, 2009
    Applicant: CISCO TECHNOLOGY, INC.
    Inventors: Stephen A. Pappert, Chen-Kuo Sun, Richard J. Orazi
  • Hybrid Optical and Electrical Fiber Optic Link Linearizer
    Publication number: 20090028578
    Abstract: Techniques and systems for reducing nonlinear distortions in an output optical beam from an optical transmitter by using both electrical pre-distortion compensation and optical compensation.
    Type: Application
    Filed: August 14, 2008
    Publication date: January 29, 2009
    Applicant: CISCO TECHNOLOGY, INC.
    Inventors: Chen-Kuo Sun, Richard J. Orazi, Stephen A. Pappert
  • Hybrid optical and electrical fiber optic link linearizer
    Patent number: 7426350
    Abstract: Techniques and systems for reducing nonlinear distortions in an output optical beam from an optical transmitter by using both electrical pre-distortion compensation and optical compensation.
    Type: Grant
    Filed: October 25, 2002
    Date of Patent: September 16, 2008
    Assignee: Cisco Technology, Inc.
    Inventors: Chen-Kuo Sun, Richard J. Orazi, Stephen A. Pappert
  • Dynamic range extended for optical transmitters
    Patent number: 6619866
    Abstract: A dynamic range extender for optical transmitters comprises a bipolar distortion compensator for increasing drive signal gain as the absolute level of an input signal increases beyond a selected input voltage threshold, a signal coupler for dividing the input signal into complementary signals, a unipolar distortion compensator for increasing drive signal gain of each complementary signal beyond a selected forward current threshold, a signal clipper for pre-clipping each complementary signal below a selected clipping threshold, and complementary driver outputs to drive each of a pair of laser diodes in a complementary push-pull arrangement. The pre-clipping prevents the laser diodes from being driven below their threshold current level, and the distortion compensation suppresses second and third order harmonic distortion when the complementary signals generated by the laser diodes are combined by differential photodiodes.
    Type: Grant
    Filed: March 17, 2000
    Date of Patent: September 16, 2003
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Chen-Kuo Sun, Stephen A. Pappert
  • Method for characterization of optical waveguide devices using partial coherence interferometry
    Patent number: 5341205
    Abstract: An optical system and method include a short coherence length edge, emitt LED, a fiber optic coupler probe, and a Michelson interferometer to measure the parameter of thickness of optical devices, such as thin silicon substrate samples and to characterize other parameters of optical waveguide devices such as absolute attenuation, effective refractive index, and changes in these parameters with the application of a modulation voltage or an external disturbance. The measurable thickness range from a few to hundreds of microns with a thickness precision exceeding 0.1 micron for a 10 micron sample. In situ localized measurements of samples in an etching chamber are obtainable to control processing and provide for thickness uniformity. Attenuation measurements for optical waveguides compare the values of interferogram maxima at the values of the reference arm path length to changes corresponding to one and two times the optical path length of the sample.
    Type: Grant
    Filed: January 15, 1991
    Date of Patent: August 23, 1994
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Matthew N. McLandrich, Donald J. Albares, Stephen A. Pappert