Patents by Inventor Thuthuy Bach

Thuthuy Bach 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).

  • Wavelength and/or subband assignment algorithm in all optical networks for minimal blocking
    Patent number: 7079767
    Abstract: A system and method for minimizing blocking in optical networks utilizes algorithms developed to reduce non-revenue generating OEO conversions as a result of blocking based on routing and wavelength and/or subband assignment. Demands are prioritized on a basis of optical reach, and regenerators required for overcoming optical reach limitations are strategically placed to overcome blocking.
    Type: Grant
    Filed: June 28, 2002
    Date of Patent: July 18, 2006
    Assignee: PTS Corporation
    Inventors: Thuthuy Bach, Ashish Duggal
  • Method of providing restoration routes in a mesh network
    Patent number: 6856592
    Abstract: A method of providing restoration routes for protecting traffic in a mesh network is described. The method comprises the steps of generating a set of eligible restoration routes for each span in the network, establishing a bi-criteria objective function in terms of route length and capacity cost for selecting a set of restoration routes, and selecting a set of restoration routes for each span from the eligible restoration routes in dependence upon the bi-criteria objective function. Embodiments of the invention may be useful for shortening the lengths, in terms of hops, of existing restoration routes in a mesh-restorable network and in some cases with negligible spare capacity penalty.
    Type: Grant
    Filed: March 15, 2001
    Date of Patent: February 15, 2005
    Assignee: Nortel Networks Limited
    Inventors: Wayne D. Grover, John Doucette, Thuthuy Bach
  • Wavelength and/or subband assignment algorithm in all optical networks for minimal blocking
    Publication number: 20040208557
    Abstract: A system and method for minimizing blocking in optical networks utilizes algorithms developed to reduce non-revenue generating OEO conversions as a result of blocking based on routing and wavelength and/or subband assignment. Demands are prioritized on a basis of optical reach, and regenerators required for overcoming optical reach limitations are strategically placed to overcome blocking.
    Type: Application
    Filed: June 28, 2002
    Publication date: October 21, 2004
    Inventors: Thuthuy Bach, Ashish Duggal
  • Method of providing restoration routes in a mesh network
    Publication number: 20020181393
    Abstract: A method of providing restoration routes for protecting traffic in a mesh network is described. The method comprises the steps of generating a set of eligible restoration routes for each span in the network, establishing a bi-criteria objective function in terms of route length and capacity cost for selecting a set of restoration routes, and selecting a set of restoration routes for each span from the eligible restoration routes in dependence upon the bi-criteria objective function. Embodiments of the invention may be useful for shortening the lengths, in terms of hops, of existing restoration routes in a mesh-restorable network and in some cases with negligible spare capacity penalty.
    Type: Application
    Filed: March 15, 2001
    Publication date: December 5, 2002
    Inventors: Wayne D. Grover, John Doucette, Thuthuy Bach