Patents by Inventor David James Wall

David James Wall 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).

  • Method and apparatus for providing gain shape compensation
    Publication number: 20020135842
    Abstract: To monitor and compensate for gain shape variations in an optical fiber communication system usually a submarine such system, a low-frequency amplitude modulation is imposed at known amplitude upon location, usually a shore terminal (2). At another location, e.g. equalisation station (10), the received amplitude is monitored. Variations as between different channels represent response variations also in relation to signals and are compensated for.
    Type: Application
    Filed: April 23, 2002
    Publication date: September 26, 2002
    Inventors: George Zarris, David James Wall
  • Optical add/drop wavelength division multiplex systems
    Patent number: 6208441
    Abstract: An optical-wavelength division multiplexing system, method and branching unit. The arrangement drops one, or more than one, predetermined wavelength signal(&lgr;2) from a trunk(18) onto a branch and adds signals(&lgr;2′) at the predetermined wavelength, or at a predetermined different wavelength from the branch out of the trunk. A sensor(34) senses the level of the signal(s) dropped and a controller(36), which responds to the control signal, adjusts the level of the add signal(s)(&lgr;2′) to an optimum level for adding to the trunk(18).
    Type: Grant
    Filed: September 4, 1998
    Date of Patent: March 27, 2001
    Assignee: Alcatel
    Inventors: Kevan Peter Jones, David James Wall