Patents by Inventor Mohsen Nader Tehrani

Mohsen Nader Tehrani 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).

  • Clock recovery for subcarrier based coherent optical systems
    Patent number: 10911150
    Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for clock recovery in subcarrier based coherent optical systems. In one aspect, an apparatus includes a plurality of phase detectors configured to generate a plurality of phase detection outputs by detecting a plurality of digital signals associated with a plurality of frequency bands, each of the plurality of phase detection outputs being associated with a respective one of the plurality of frequency bands, alignment circuitry coupled to the plurality of phase detectors and configured to align phases of the plurality of phase detection outputs to be substantially same, and averaging circuitry coupled to the alignment circuitry and configured to generate a particular output based on the plurality of phase detection outputs with the aligned phases. The plurality of digital signals is adjusted based on the particular output.
    Type: Grant
    Filed: June 25, 2019
    Date of Patent: February 2, 2021
    Assignee: Infinera Corporation
    Inventors: Mohsen Nader Tehrani, Han Henry Sun, David Krause
  • CLOCK RECOVERY FOR SUBCARRIER BASED COHERENT OPTICAL SYSTEMS
    Publication number: 20190393964
    Abstract: Methods, systems, and apparatus, including computer programs encoded on computer storage media, for clock recovery in subcarrier based coherent optical systems. In one aspect, an apparatus includes a plurality of phase detectors configured to generate a plurality of phase detection outputs by detecting a plurality of digital signals associated with a plurality of frequency bands, each of the plurality of phase detection outputs being associated with a respective one of the plurality of frequency bands, alignment circuitry coupled to the plurality of phase detectors and configured to align phases of the plurality of phase detection outputs to be substantially same, and averaging circuitry coupled to the alignment circuitry and configured to generate a particular output based on the plurality of phase detection outputs with the aligned phases. The plurality of digital signals is adjusted based on the particular output.
    Type: Application
    Filed: June 25, 2019
    Publication date: December 26, 2019
    Inventors: Mohsen Nader Tehrani, Han Henry Sun, David Krause
  • Apparatus and method for blind LOFO estimation in coherent optical receiver
    Patent number: 9871597
    Abstract: A method and apparatus is described for estimating a local oscillator frequency offset (LOFO) of a received optical signal in a coherent optical receiver.
    Type: Grant
    Filed: April 11, 2016
    Date of Patent: January 16, 2018
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Mohsen Nader Tehrani, Syed Faisal Ali Shah, Zhuhong Zhang, Chuandong Li
  • Apparatus and Method for Blind LOFO Estimation in Coherent Optical Receiver
    Publication number: 20170294971
    Abstract: A method and apparatus is described for estimating a local oscillator frequency offset (LOFO) of a received optical signal in a coherent optical receiver.
    Type: Application
    Filed: April 11, 2016
    Publication date: October 12, 2017
    Inventors: Mohsen Nader Tehrani, Syed Faisal Ali Shah, Zhuhong Zhang, Chuandong Li