Patents by Inventor Franz Li Hsien Mok

Franz Li Hsien Mok 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
  • Optical amplifier gain control
    Patent number: 6166850
    Abstract: In an optical transmission system employing optical amplifiers a method of regulating the gain of such an amplifier uses a non-linear control system whose non-linearity of operation is provided at least in part by the enabling/disabling of a portion of the control system by the operation of a transient magnitude threshold sensor.
    Type: Grant
    Filed: November 4, 1998
    Date of Patent: December 26, 2000
    Assignee: Nortel Networks Limited
    Inventors: Kim Byron Roberts, Franz Li Hsien Mok, Richard Achile Habel, Nigel Edward Jolley