Patents by Inventor Douglas J. Greenwood

Douglas J. Greenwood 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).

  • Patent number: 8811822
    Abstract: A system and method for selecting ghost channels in an optical communication system, including components configured to examine an optical communication channel within a node of the optical communication system, examine a neighbor channel of the optical communication channel, determine whether using the neighbor channel as a ghost channel will create an undesirable level of risk of feedback within the optical communication system, if using the neighbor channel as a ghost channel will not create an undesirable level of risk of feedback, determine whether the neighbor channel is currently used as a ghost channel, and if the neighbor channel is not currently used as a ghost channel, select the neighbor channel as a ghost channel.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: August 19, 2014
    Assignee: Fujitsu Limited
    Inventors: Denis Daniel Leclair, Sean D. L. McVeigh, Kevan P. Jones, Jean V. E. Ouellet, Douglas J. Greenwood, John B. Mills, Robert W. Keys
  • Patent number: 8670664
    Abstract: A system and method for managing the selection of ghost channels in an optical communication system, including components configured to collect one or more first data values indicating the validity of an optical communication channel within a first degree of a node in the optical communication system, collect one or more second data values indicating the optical power level of the optical communication channel, transmit the first and second data values to a second degree of the node, receive the first and second data values at the first degree, and aggregate the first and second data values for the first degree and the second degree at the first degree.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: March 11, 2014
    Assignee: Fujitsu Limited
    Inventors: Denis Daniel Leclair, Sean D. L. McVeigh, Kevan P. Jones, Jean V. E. Ouellet, Douglas J. Greenwood, John B. Mills, Robert W. Keys
  • Patent number: 8542992
    Abstract: A system for mitigating the effects of polarization hole burning in an optical communication system. The system includes an optical input signal comprising one or more traffic channels, a measurement module configured to check for the existence of ghost channels around the traffic channels, and a ghost channel generation module configured to generate a ghost channel around the traffic channels from amplified spontaneous emission noise of the optical input signal.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: September 24, 2013
    Assignee: Fujitsu Limited
    Inventors: Kevan P. Jones, Denis Daniel Leclair, Sean D. L. McVeigh, Jean V. E. Ouellet, Douglas J. Greenwood, John B. Mills, Robert W. Keys
  • Patent number: 8090259
    Abstract: A system and method for optimizing the selection of ghost channels to mitigate the effects of polarization hole burning in a node of an optical communication system including identifying an optical communication channel in the node for use as a ghost channel, identifying a first set of degrees carrying the optical communication channel within the node, identifying a second set of degrees within the first set of degrees, the second set containing the degrees with the optical communication channel being a valid channel, identifying a third set of degrees within the first set of degrees, the third set containing degrees with the optical communication channel being sufficiently powerful, and selecting a first degree to source the ghost channel from the first set of degrees based at least on the second set of degrees and the third set of degrees.
    Type: Grant
    Filed: February 26, 2010
    Date of Patent: January 3, 2012
    Assignee: Fujitsu Limited
    Inventors: Denis Daniel Leclair, Sean D. L. McVeigh, Kevan P. Jones, Jean V. E. Ouellet, Douglas J. Greenwood, John B. Mills, Robert W. Keys
  • Publication number: 20110211841
    Abstract: A system and method for managing the selection of ghost channels in an optical communication system, including components configured to collect one or more first data values indicating the validity of an optical communication channel within a first degree of a node in the optical communication system, collect one or more second data values indicating the optical power level of the optical communication channel, transmit the first and second data values to a second degree of the node, receive the first and second data values at the first degree, and aggregate the first and second data values for the first degree and the second degree at the first degree.
    Type: Application
    Filed: February 26, 2010
    Publication date: September 1, 2011
    Inventors: Denis Daniel Leclair, Sean D. McVeigh, Kevan P. Jones, Jean V. E. Ouellet, Douglas J. Greenwood, John B. Mills, Robert W. Keys
  • Publication number: 20110211836
    Abstract: A system and method for optimizing the selection of ghost channels to mitigate the effects of polarization hole burning in a node of an optical communication system including identifying an optical communication channel in the node for use as a ghost channel, identifying a first set of degrees carrying the optical communication channel within the node, identifying a second set of degrees within the first set of degrees, the second set containing the degrees with the optical communication channel being a valid channel, identifying a third set of degrees within the first set of degrees, the third set containing degrees with the optical communication channel being sufficiently powerful, and selecting a first degree to source the ghost channel from the first set of degrees based at least on the second set of degrees and the third set of degrees.
    Type: Application
    Filed: February 26, 2010
    Publication date: September 1, 2011
    Inventors: Denis Daniel Leclair, Sean D.L. McVeigh, Kevan P. Jones, Jean V.E. Ouellet, Douglas J. Greenwood, John B. Mills, Robert W. Keys
  • Publication number: 20110211835
    Abstract: A system for mitigating the effects of polarization hole burning in an optical communication system. The system includes an optical input signal comprising one or more traffic channels, a measurement module configured to check for the existence of ghost channels around the traffic channels, and a ghost channel generation module configured to generate a ghost channel around the traffic channels from amplified spontaneous emission noise of the optical input signal.
    Type: Application
    Filed: February 26, 2010
    Publication date: September 1, 2011
    Inventors: Kevan P. Jones, Denis Daniel Leclair, Sean D.L. McVeigh, Jean V.E. Ouellet, Douglas J. Greenwood, John B. Mills, Robert W. Keys
  • Publication number: 20110211826
    Abstract: A system and method for selecting ghost channels in an optical communication system, including components configured to examine an optical communication channel within a node of the optical communication system, examine a neighbor channel of the optical communication channel, determine whether using the neighbor channel as a ghost channel will create an undesirable level of risk of feedback within the optical communication system, if using the neighbor channel as a ghost channel will not create an undesirable level of risk of feedback, determine whether the neighbor channel is currently used as a ghost channel, and if the neighbor channel is not currently used as a ghost channel, select the neighbor channel as a ghost channel.
    Type: Application
    Filed: February 26, 2010
    Publication date: September 1, 2011
    Inventors: Denis Daniel Leclair, Sean D.L. McVeigh, Kevan P. Jones, Jean V.E. Ouellet, Douglas J. Greenwood, John B. Mills, Robert W. Keys