Patents by Inventor Fabrizio Forghieri

Fabrizio Forghieri 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).

  • Lumped raman amplifier for adaptive dispersion compensation
    Patent number: 6798945
    Abstract: An adaptive dispersion compensation system that also achieves optical amplification by inducing Raman amplification effects in dispersion compensating fiber. This amplification/chromatic dispersion compensation architecture may be applied, e.g., at the end of an all-optical link, or an intermediate points along the link. By varying the length of dispersion compensating fiber used and the pump power, one may accommodate a wide range of dispersion compensation requirements as determined in the field. This scheme also provides all of the advantages typically provided by the use of Raman amplification.
    Type: Grant
    Filed: August 30, 2001
    Date of Patent: September 28, 2004
    Assignee: Cisco Technology, Inc.
    Inventors: Fabrizio Di Pasquale, Fabrizio Forghieri
  • WDM optical fiber system using Raman amplification
    Patent number: 6191877
    Abstract: Pump depletion modulation crosstalk between WDM channels in Raman amplified systems is virtually eliminated by exclusive use of backward pumping.
    Type: Grant
    Filed: July 15, 1996
    Date of Patent: February 20, 2001
    Assignee: Lucent Technologies Inc.
    Inventors: Andrew R. Chraplyvy, Fabrizio Forghieri, Robert William Tkach
  • Multi-channel optical fiber communication system
    Patent number: 5847862
    Abstract: A significant part of signal-to-noise degradation in WDM optical fiber communications, due to Raman crosstalk, is found to be deterministic in nature. Shaping of amplifier output to offset depletion of high frequency channels improves signal capacity by an order of magnitude.
    Type: Grant
    Filed: November 29, 1997
    Date of Patent: December 8, 1998
    Assignee: Lucent Technologies Incorporated
    Inventors: Andrew R. Chraplyvy, Fabrizio Forghieri, Robert William Tkach
  • Dispersion compensation in optical fiber communications
    Patent number: 5559920
    Abstract: Critical placement and lengths of dispersion-compensating fiber maximize capacity in upgraded in-ground optical fiber communication systems. Higher per-channel bit rates in single-channel systems and in WDM systems are permitted.
    Type: Grant
    Filed: March 1, 1995
    Date of Patent: September 24, 1996
    Assignee: Lucent Technologies Inc.
    Inventors: Andrew R. Chraplyvy, Fabrizio Forghieri, Alan H. Gnauck, Robert W. Tkach
  • Multi-channel optical fiber communication system
    Patent number: 5546210
    Abstract: Wavelength Division Multiplexed channels in optical fiber communications systems have channel-to-channel frequency spacings which prevent substantial coincidence of 4-wave mixing products with channel carriers. As a consequence, system capacity is increased.
    Type: Grant
    Filed: July 13, 1995
    Date of Patent: August 13, 1996
    Assignee: AT&T Corp.
    Inventors: Andrew R. Chraplyvy, Fabrizio Forghieri, Robert W. Tkach