Patents by Inventor Amirhossein Ghazisaeidi

Amirhossein Ghazisaeidi 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).

  • Patent number: 9813160
    Abstract: Proposed is a method of equalizing an optical signal that has an overall bandwidth formed on a number of adjacent spectral slots, wherein the signal comprises a set of non-overlapping subcarrier signals. A distribution of the subcarrier signals onto the slots is such, that at least one slot is occupied by more than one subcarrier signal. The signal is received and amplified. Respective power levels are measured for the subcarrier signals. Distribution data is provided, which indicates the distribution of the subcarrier signals onto the spectral slots. Power level data is provided, which indicates for the spectral slots respective desired power levels. For the spectral slots respective attenuation values are derived, using the measured power levels, the distribution data and the power level data. Finally, the optical transmission signal is attenuated within the spectral slots individually, using the derived attenuation values.
    Type: Grant
    Filed: February 3, 2015
    Date of Patent: November 7, 2017
    Assignee: Alcatel Lucent
    Inventors: Annalisa Morea, Jeremie Renaudier, Amirhossein Ghazisaeidi
  • Publication number: 20170117967
    Abstract: Proposed is a method of equalizing an optical signal that has an overall bandwidth formed on a number of adjacent spectral slots, wherein the signal comprises a set of non-overlapping subcarrier signals. A distribution of the subcarrier signals onto the slots is such, that at least one slot is occupied by more than one subcarrier signal. The signal is received and amplified. Respective power levels are measured for the subcarrier signals. Distribution data is provided, which indicates the distribution of the subcarrier signals onto the spectral slots. Power level data is provided, which indicates for the spectral slots respective desired power levels. For the spectral slots respective attenuation values are derived, using the measured power levels, the distribution data and the power level data. Finally, the optical transmission signal is attenuated within the spectral slots individually, using the derived attenuation values.
    Type: Application
    Filed: February 3, 2015
    Publication date: April 27, 2017
    Inventors: Annalisa MOREA, Jeremie RENAUDIER, Amirhossein GHAZISAEIDI
  • Patent number: 9490905
    Abstract: An apparatus, a method and a computer program for determining estimates is disclosed. The apparatus determines estimates for transmitted symbols from received symbols of an optical signal affected by cross-Polarization Modulation (XpolM). The apparatus groups two or more subsequent received symbols from the optical signal into a group of received symbols and estimates an optical channel based on the group of received symbols and a hypothesis on the transmitted symbols. The apparatus further determines a reliability measure for a combination of the group of received symbols, the channel estimate, and the hypothesis, and determines the estimates for the transmitted symbols based on reliability measures for multiple hypotheses on the transmitted symbols.
    Type: Grant
    Filed: October 8, 2013
    Date of Patent: November 8, 2016
    Assignee: Alcatel Lucent
    Inventors: Patricia Layec, Amirhossein Ghazisaeidi
  • Publication number: 20150244456
    Abstract: An apparatus, a method and a computer program for determining estimates is disclosed. The apparatus determines estimates for transmitted symbols from received symbols of an optical signal affected by cross-Polarization Modulation (XpolM). The apparatus groups two or more subsequent received symbols from the optical signal into a group of received symbols and estimates an optical channel based on the group of received symbols and a hypothesis on the transmitted symbols. The apparatus further determines a reliability measure for a combination of the group of received symbols, the channel estimate, and the hypothesis, and determines the estimates for the transmitted symbols based on reliability measures for multiple hypotheses on the transmitted symbols.
    Type: Application
    Filed: October 8, 2013
    Publication date: August 27, 2015
    Inventors: Patricia Layec, Amirhossein Ghazisaeidi
  • Publication number: 20150030331
    Abstract: An exemplary technique is provided for a coherent optical receiver adapted to receive an optical signal transmitted over an optical transmission channel exhibiting Cross-Polarization Modulation (XPOLM). The received optical signal comprises a first polarization component and a second polarization component.
    Type: Application
    Filed: March 28, 2013
    Publication date: January 29, 2015
    Inventors: Massimiliano Salsi, Amirhossein Ghazisaeidi, Paolo Serena