Patents by Inventor Philip D. Williams

Philip D. Williams 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).

  • Passive optical network (PON) having optical network unit (ONU) using feedback to detect rogue conditions and related method
    Patent number: 8582969
    Abstract: In accordance with a non-limiting example, an Optical Network Unit (ONU) includes an optical transmitter that has a laser diode and laser driver connected to the laser diode and configured to drive the laser diode so that the laser diode emits an optical communications signal based on transmit data signals. A feedback circuit includes a monitoring photodiode that receives optical feedback signals from the laser diode. A watchdog circuit is connected to the monitoring photodiode and laser driver and includes a logic circuit configured to process the feedback signals and transmit signals to determine if the ONU is rogue. This logic circuit in one example is an XOR logic circuit.
    Type: Grant
    Filed: November 30, 2010
    Date of Patent: November 12, 2013
    Assignee: Adtran, Inc.
    Inventors: Leif J. Sandstrom, Philip D. Williams, Richard L. Goodson