Patents Assigned to Cisco Technolog, Inc.
  • Reduced four-wave mixing and raman amplification architecture
    Patent number: 6867905
    Abstract: Raman amplifiers with improved signal to noise ratio and four-wave mixing product suppression are provided. In one embodiment, both co-propagating and counter-propagating pump energy are employed to cause Raman amplification effects within a fiber. Improved Raman amplification performance including improved four-wave mixing product suppression facilitates longer distance transmission without regeneration of optical signals and/or denser WDM channel spacings.
    Type: Grant
    Filed: July 5, 2001
    Date of Patent: March 15, 2005
    Assignee: Cisco Technolog, Inc.
    Inventors: Enrico Griseri, Fabrizio Forghieri