Patents by Inventor Dwight Hugh Richards

Dwight Hugh Richards 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 system for detecting loss of signal in wavelength division multiplexed systems
    Patent number: 6115154
    Abstract: A method and system for unambiguously detecting fiber cuts in an optical network regardless of the number of EDFAs that are located between the fiber cut and the monitor point. In accordance with our invention, the power of a marker wavelength is compared to the power of a nearby spectral region. Where the comparison indicates that the power ratio is approximately equal to unity a flag is raised indicating that there is fiber cut. Where the comparison indicates that the power ratio is much greater than unity the flag is not raised. The monitoring point includes circuitry for detecting the ratio between the marker wavelength and the nearby spectral band and for indicating when there is a fiber cut.
    Type: Grant
    Filed: September 18, 1998
    Date of Patent: September 5, 2000
    Assignee: Telcordia Technologies, Inc.
    Inventors: Neophytos Antoniades, Janet Lehr Jackel, Dwight Hugh Richards, Wei Xin