Patents by Inventor Armaghan ESHAGHI

Armaghan ESHAGHI 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).

  • Publication number: 20240120652
    Abstract: A method of beamforming by which a signal is received by a crossbar array of phase change materials (PCM) operative to be modulated electronically to impart complex Cartesian weighting and to retain transmission parameters for future processing. A PCM crossbar array can receive a signal from carrier waves modulated by an array of antenna elements, and send a complex Cartesian weighed result to a baseband combiner. Alternatively, a PCM crossbar array can receive a signal from carrier waves modulated by a baseband precoder, and send a complex Cartesian weighed result to an array of antenna elements. Either of the baseband combiner and baseband precoder can be digital or optical. Implementations allow optically based beamforming with the retention of long-term stochastics in the PCM cells, and are therefore broadband, fast, and energy efficient, as channel state information is not required to be stored otherwise.
    Type: Application
    Filed: October 6, 2022
    Publication date: April 11, 2024
    Applicant: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Mahsa SALMANI, Sreenil SAHA, Enxiao LUAN, Armaghan ESHAGHI
  • Patent number: 11874501
    Abstract: A photonic device configured to perform matrix vector multiplication operations at high frequencies is provided. The vector being multiplied by the matrix is defined by vector components at specific wavelengths. The device includes a first waveguide and a second waveguide. A series of tunable microring resonators (MRRs) are coupled to the first waveguide and to a respective series of passive delay rings (PDRs), which are coupled to the second waveguide. Each MRR/PDR pair defines a tunable matrix component (tunable weight) for a respective wavelength component of the vector. A series of controllable delay elements (CDEs) such as all-pass filters are coupled to the first waveguide, upstream from the tunable MRRs. Any tuning dependent group delay caused by the MRR/PDR pairs can be compensated by controlling the CDEs such that each wavelength components has substantially a same delay as the other wavelength components.
    Type: Grant
    Filed: August 19, 2022
    Date of Patent: January 16, 2024
    Assignees: HUAWEI TECHNOLOGIES CANADA CO., LTD., QUEEN'S UNIVERSITY AT KINGSTON, THE UNIVERSITY OF BRITISH COLUMBIA
    Inventors: Mitchell Nichols, Enxiao Luan, Mahsa Salmani, Armaghan Eshaghi, Lutz Hans-Joachim Lampe
  • Publication number: 20230387968
    Abstract: Matrix multiplication is performed using a photonic computing block. Matrices are preprocessed to derive representative positive, real-valued matrices. The representative matrices are multiplied using a photonic computing block in which elements of a first matrix are encoded as a signal intensity and elements of a second matrix are encoded by tuning a spectral filter to apply a corresponding weight coefficient. Pairwise multiplications of matrix elements are performed by processing different wavelength components of an overall optical signal. A balanced photodiode receives the different wavelength components following manipulation in order to complete the multiplication. A matrix multiplication can be partitioned to fit a photonic computing block. The partitions are processed in parallel by multiple photonic computing blocks then reassembled into a final matrix. The multiplication operation can be part of a matrix inversion operation.
    Type: Application
    Filed: June 2, 2023
    Publication date: November 30, 2023
    Applicant: HUAWEI TECHNOLOGIES CANADA CO., LTD.
    Inventors: Armaghan ESHAGHI, Mahsa SALMANI
  • Publication number: 20230376740
    Abstract: A method for operating a reservoir computer includes receiving an input symbol and applying a time mask to the input symbol to produce a plurality of time multiplexed nodes. The method includes modulating, using the plurality of time nodes, a plurality of frequency channels to produce a plurality of frequency nodes and multiplexing the plurality of frequency nodes to produce a plurality of multiplexed frequency nodes. The method also includes coupling the multiplexed frequency nodes into a reservoir that includes a non-linear element and receiving a delayed plurality of time-frequency multiplexed nodes from the reservoir. The method also includes demultiplexing the delayed plurality of multiplexed frequency nodes to produce a plurality of delayed time nodes and modulating, using the plurality of delayed time nodes and the input time nodes, the plurality of frequency channels. The method further includes outputting a response based on the plurality of delayed time nodes.
    Type: Application
    Filed: July 14, 2023
    Publication date: November 23, 2023
    Applicant: HUAWEI TECHNOLOGIES CANADA CO., LTD.
    Inventors: Behrooz SEMNANI, Armaghan ESHAGHI
  • Publication number: 20230333441
    Abstract: A waveguide is coupled at both ends to a microring (MRR) modulator in order to form a Mach-Zehnder interferometer out of the resulting unit. The coupled waveguide can be modulated independently from the MRR modulator itself with either an in-resonance photoconductive heater or a geometrically suitable PN junction. During modulation with an applied voltage to the coupler, an independent modulation can be applied to the MRR in order to compensate for wavelength shifting. Ideal lengths for the coupler are identified, as well as a spiral configuration to reduce the coupler's footprint on a photonic integrated circuit. The resulting device has reduced cross-talk between channels of a cascaded MRR system. A second coupler can be coupled to each MRR symmetrically so as to reduce insertion losses, allowing for an increased weight range at the drop and through ports.
    Type: Application
    Filed: June 21, 2023
    Publication date: October 19, 2023
    Applicant: HUAWEI TECHNOLOGIES CANADA CO., LTD.
    Inventors: Enxiao LUAN, Armaghan ESHAGHI
  • Patent number: 10461413
    Abstract: A phased array antenna system is provided, comprising a support member having a mounting surface; a plurality of electronic components supported on the mounting surface; an antenna supported on the support member adjacent to a perimeter of the mounting surface, for transmitting and receiving ultra-high frequency radio waves of wavelength ?; and an enclosure. The enclosure includes a top portion and a bottom portion for enclosing the support member and a radome for enclosing the antenna. The center of curvature of the radome is positioned less than 1? from an end of the antenna. The thickness of the radome is approximately ?/5 and the radius of the radome is less than 1?.
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: October 29, 2019
    Assignee: PERASO TECHNOLOGIES INC.
    Inventors: Armaghan Eshaghi, Pradeep Persaud
  • Publication number: 20180083352
    Abstract: A phased array antenna system is provided, comprising a support member having a mounting surface; a plurality of electronic components supported on the mounting surface; an antenna supported on the support member adjacent to a perimeter of the mounting surface, for transmitting and receiving ultra-high frequency radio waves of wavelength ?; and an enclosure. The enclosure includes a top portion and a bottom portion for enclosing the support member and a radome for enclosing the antenna. The center of curvature of the radome is positioned less than 1 ? from an end of the antenna. The thickness of the radome is approximately ?/5 and the radius of the radome is less than 1 ?.
    Type: Application
    Filed: September 19, 2017
    Publication date: March 22, 2018
    Inventors: Armaghan ESHAGHI, Pradeep PERSAUD