Patents by Inventor Robert Michael Percival

Robert Michael Percival 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).

  • Optical communication link fault signalling
    Patent number: 5724149
    Abstract: A fault signalling system for an optical fiber-based communications link having erbium doped fiber amplifier repeaters comprises a broadband optical source for generating a fault signal in the event of a fault occurring. Each repeater includes such a broadband source, which will output a characteristic fault signal onto the link for transmission to a receiving station, in the event of a fault being detected at that repeater. Advantageously, a control circuit which enables the source to emit its fault signal when appropriate is also used as part of an automatic gain control for the output of the amplifier repeater in normal operation.
    Type: Grant
    Filed: December 3, 1992
    Date of Patent: March 3, 1998
    Assignee: British Telecommunications plc
    Inventors: William Andrew Stallard, Andrew David Ellis, Robert Michael Percival