Patents by Inventor Stephen P Hegarty

Stephen P Hegarty 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).

  • Hybrid Raman-erbium optical amplifier
    Patent number: 6665114
    Abstract: A hybrid optical signal amplifier is provided which includes the combination of a Raman amplifier and an EDFA assembly. The Raman amplifier has an output defined by regions of higher and lower gain levels, and the EDFA assembly has an output having a region, near the longer wavelengths thereof, that includes a maximum noise figure. The spectrum region of higher gain level of the Raman amplifier is selected to correspond to the spectrum region of the EDFA assembly that includes the maximum noise figure in order to lower the maximum noise figure of the resulting optical signal amplifier, as well as to flatten the gain across the output spectrum.
    Type: Grant
    Filed: February 26, 2002
    Date of Patent: December 16, 2003
    Assignee: Corning Incorporated
    Inventors: Seldon D Benjamin, Alan F Evans, Stephen P Hegarty, Ashiqur Rahman
  • HYBRID RAMAN-ERBIUM OPTICAL AMPLIFIER
    Publication number: 20030161031
    Abstract: A hybrid optical signal amplifier is provided which includes the combination of a Raman amplifier and an EDFA assembly. The Raman amplifier has an output defined by regions of higher and lower gain levels, and the EDFA assembly has an output having a region, near the longer wavelengths thereof, that includes a maximum noise figure. The spectrum region of higher gain level of the Raman amplifier is selected to correspond to the spectrum region of the EDFA assembly that includes the maximum noise figure in order to lower the maximum noise figure of the resulting optical signal amplifier, as well as to flatten the gain across the output spectrum.
    Type: Application
    Filed: February 26, 2002
    Publication date: August 28, 2003
    Inventors: Seldon D. Benjamin, Alan F. Evans, Stephen P. Hegarty, Ashiqur Rahman