Patents by Inventor Mathieu Dutrisac

Mathieu Dutrisac 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).

  • Fast loss of signal (LOS) detection for bidirectional optical amplifiers
    Patent number: 6222668
    Abstract: A fast means of detecting that a fiber has been disconnected at one end of a bidirectional optical amplifier by monitoring for several signature effects simultaneously. Upon detection of a loss of signal, the pump laser in the corresponding direction is shut off quickly to prevent oscillation from occurring should the other end of the amplifier be subsequently disconnected.
    Type: Grant
    Filed: May 8, 1998
    Date of Patent: April 24, 2001
    Assignee: Nortel Networks Limited
    Inventors: Mathieu Dutrisac, Richard Achile Habel, Robert Keys, Franz Li Hsien Mok, Jeffrey Alan Weslowski