Patents by Inventor Fernando Xavier Villarruel

Fernando Xavier Villarruel 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).

  • Sparing for multi-wavelength optical transmitter
    Patent number: 8467676
    Abstract: A multi-wavelength optical transmission system includes a plurality of primary optical transmitters, each being configured to provide directly modulated analog optical signals at non-uniformly spaced apart wavelengths. An optical multiplexer having a plurality of optical input ports receives the analog optical signals from each of the plurality of primary optical transmitters and provides a wavelength division multiplexed signal over an optical fiber coupled at an output thereof. A spare optical transmitter is coupled to an input port of the optical multiplexer and, in response to detecting failure of a failed one of the plurality of primary optical transmitters, is tuned to provide a directly modulated analog optical signal at a spare wavelength that is selected as to be non-uniformly spaced relative to at least some of the non-uniformly spaced apart wavelengths according to tuning data.
    Type: Grant
    Filed: January 16, 2009
    Date of Patent: June 18, 2013
    Assignee: Cisco Technology, Inc.
    Inventors: Fernando Xavier Villarruel, Kuang-Yi Wu, Fred S. Hirt
  • Raman cancellation and management in CATV transport and distribution via RF spectrum inversion
    Patent number: 8009988
    Abstract: Provided herein are at least one embodiment of a system and method for reducing or eliminating crosstalk and associated distortion in a wavelength-division multiplexed optical signal transmitted over a fiber optic network by inversion of the RF signals that are inputs to the system.
    Type: Grant
    Filed: November 20, 2007
    Date of Patent: August 30, 2011
    Inventors: Mary R. Phillips, Kuang-yi Wu, Fernando Xavier Villarruel
  • SPARING FOR MULTI-WAVELENGTH OPTICAL TRANSMITTER
    Publication number: 20100183294
    Abstract: A multi-wavelength optical transmission system includes a plurality of primary optical transmitters, each being configured to provide directly modulated analog optical signals at non-uniformly spaced apart wavelengths. An optical multiplexer having a plurality of optical input ports receives the analog optical signals from each of the plurality of primary optical transmitters and provides a wavelength division multiplexed signal over an optical fiber coupled at an output thereof. A spare optical transmitter is coupled to an input port of the optical multiplexer and, in response to detecting failure of a failed one of the plurality of primary optical transmitters, is tuned to provide a directly modulated analog optical signal at a spare wavelength that is selected as to be non-uniformly spaced relative to at least some of the non-uniformly spaced apart wavelengths according to tuning data.
    Type: Application
    Filed: January 16, 2009
    Publication date: July 22, 2010
    Inventors: Fernando Xavier Villarruel, Kuang-Yi Wu, Fred S. Hirt
  • RAMAN CANCELLATION AND MANAGEMENT IN CATV TRANSPORT AND DISTRIBUTION VIA RF SPECTRUM INVERSION
    Publication number: 20090129778
    Abstract: Provided herein are at least one embodiment of a system and method for reducing or eliminating crosstalk and associated distortion in a wavelength-division multiplexed optical signal transmitted over a fiber optic network by inversion of the RF signals that are inputs to the system.
    Type: Application
    Filed: November 20, 2007
    Publication date: May 21, 2009
    Inventors: Mary R. Phillips, Kuang-yi Wu, Fernando Xavier Villarruel