Patents by Inventor Jungmi Oh

Jungmi Oh 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: 20200177977
    Abstract: A quantum key distribution system is deployed in an optical fiber network transporting classical data traffic. A source of entangled photon pairs is used to generate quantum keys. Classical data traffic is typically transported over channels in the C-band. If a pair of channels for transport of quantum data is available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in the C-band. If a pair of channels for transport of quantum data is not available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in a combined S-band and L-band. When a periodically-poled lithium niobate waveguide pumped with a laser is used for the source of entangled photon pairs, the output spectral properties are tuned by varying the temperature of the waveguide.
    Type: Application
    Filed: February 3, 2020
    Publication date: June 4, 2020
    Applicant: AT&T Intellectual Property I, L.P.
    Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
  • Patent number: 10595102
    Abstract: A quantum key distribution system is deployed in an optical fiber network transporting classical data traffic. A source of entangled photon pairs is used to generate quantum keys. Classical data traffic is typically transported over channels in the C-band. If a pair of channels for transport of quantum data is available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in the C-band. If a pair of channels for transport of quantum data is not available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in a combined S-band and L-band. When a periodically-poled lithium niobate waveguide pumped with a laser is used for the source of entangled photon pairs, the output spectral properties are tuned by varying the temperature of the waveguide.
    Type: Grant
    Filed: April 3, 2018
    Date of Patent: March 17, 2020
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
  • Patent number: 10502619
    Abstract: Operational parameters of a single-photon detector are determined with a continuous wave laser source. At a fixed trigger, a dark count probability and a series of count probabilities at different optical powers are determined. A particular optical power is selected by using a wide-range variable attenuator to attenuate the optical power of the continuous wave laser. The dark count probability and the count probabilities are determined for different trigger rates. The operational parameters include efficiency, afterpulsing constant, and detrap time. The operational parameters are computed by fitting the computed dark count probabilities and count probabilities to a user-defined relationship.
    Type: Grant
    Filed: August 29, 2017
    Date of Patent: December 10, 2019
    Assignee: AT&T INTELLECTUAL PROPERTY I, L.P.
    Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
  • Publication number: 20180227651
    Abstract: A quantum key distribution system is deployed in an optical fiber network transporting classical data traffic. A source of entangled photon pairs is used to generate quantum keys. Classical data traffic is typically transported over channels in the C-band. If a pair of channels for transport of quantum data is available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in the C-band. If a pair of channels for transport of quantum data is not available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in a combined S-band and L-band. When a periodically-poled lithium niobate waveguide pumped with a laser is used for the source of entangled photon pairs, the output spectral properties are tuned by varying the temperature of the waveguide.
    Type: Application
    Filed: April 3, 2018
    Publication date: August 9, 2018
    Applicant: AT&T Intellectual Property I, L.P.
    Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
  • Patent number: 9967637
    Abstract: A quantum key distribution system is deployed in an optical fiber network transporting classical data traffic. A source of entangled photon pairs is used to generate quantum keys. Classical data traffic is typically transported over channels in the C-band. If a pair of channels for transport of quantum data is available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in the C-band. If a pair of channels for transport of quantum data is not available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in a combined S-band and L-band. When a periodically-poled lithium niobate waveguide pumped with a laser is used for the source of entangled photon pairs, the output spectral properties are tuned by varying the temperature of the waveguide.
    Type: Grant
    Filed: January 2, 2014
    Date of Patent: May 8, 2018
    Assignee: AT&T INTELLECTUAL PROPERTY I, L.P.
    Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
  • Publication number: 20170356797
    Abstract: Operational parameters of a single-photon detector are determined with a continuous wave laser source. At a fixed trigger, a dark count probability and a series of count probabilities at different optical powers are determined. A particular optical power is selected by using a wide-range variable attenuator to attenuate the optical power of the continuous wave laser. The dark count probability and the count probabilities are determined for different trigger rates. The operational parameters include efficiency, afterpulsing constant, and detrap time. The operational parameters are computed by fitting the computed dark count probabilities and count probabilities to a user-defined relationship.
    Type: Application
    Filed: August 29, 2017
    Publication date: December 14, 2017
    Applicant: AT&T Intellectual Property I, L.P.
    Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
  • Patent number: 9772223
    Abstract: Operational parameters of a single-photon detector are determined with a continuous wave laser source. At a fixed trigger, a dark count probability and a series of count probabilities at different optical powers are determined. A particular optical power is selected by using a wide-range variable attenuator to attenuate the optical power of the continuous wave laser. The dark count probability and the count probabilities are determined for different trigger rates. The operational parameters include efficiency, afterpulsing constant, and detrap time. The operational parameters are computed by fitting the computed dark count probabilities and count probabilities to a user-defined relationship.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: September 26, 2017
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
  • Publication number: 20150253187
    Abstract: Operational parameters of a single-photon detector are determined with a continuous wave laser source. At a fixed trigger, a dark count probability and a series of count probabilities at different optical powers are determined. A particular optical power is selected by using a wide-range variable attenuator to attenuate the optical power of the continuous wave laser. The dark count probability and the count probabilities are determined for different trigger rates. The operational parameters include efficiency, afterpulsing constant, and detrap time. The operational parameters are computed by fitting the computed dark count probabilities and count probabilities to a user-defined relationship.
    Type: Application
    Filed: May 22, 2015
    Publication date: September 10, 2015
    Applicant: AT&T INTELLECTUAL PROPERTY I, L.P.
    Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
  • Patent number: 9068881
    Abstract: Operational parameters of a single-photon detector are determined with a continuous wave laser source. At a fixed trigger, a dark count probability and a series of count probabilities at different optical powers are determined. A particular optical power is selected by using a wide-range variable attenuator to attenuate the optical power of the continuous wave laser. The dark count probability and the count probabilities are determined for different trigger rates. The operational parameters include efficiency, afterpulsing constant, and detrap time. The operational parameters are computed by fitting the computed dark count probabilities and count probabilities to a user-defined relationship.
    Type: Grant
    Filed: July 13, 2010
    Date of Patent: June 30, 2015
    Assignee: AT&T Intelletual Property I, L.P.
    Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
  • Publication number: 20140119729
    Abstract: A quantum key distribution system is deployed in an optical fiber network transporting classical data traffic. A source of entangled photon pairs is used to generate quantum keys. Classical data traffic is typically transported over channels in the C-band. If a pair of channels for transport of quantum data is available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in the C-band. If a pair of channels for transport of quantum data is not available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in a combined S-band and L-band. When a periodically-poled lithium niobate waveguide pumped with a laser is used for the source of entangled photon pairs, the output spectral properties are tuned by varying the temperature of the waveguide.
    Type: Application
    Filed: January 2, 2014
    Publication date: May 1, 2014
    Applicant: AT&T Intellectual Property I, L.P.
    Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
  • Patent number: 8699876
    Abstract: A quantum key distribution system is deployed in an optical fiber network transporting classical data traffic. A source of entangled photon pairs is used to generate quantum keys. Classical data traffic is typically transported over channels in the C-band. If a pair of channels for transport of quantum data is available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in the C-band. If a pair of channels for transport of quantum data is not available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in a combined S-band and L-band. When a periodically-poled lithium niobate waveguide pumped with a laser is used for the source of entangled photon pairs, the output spectral properties are tuned by varying the temperature of the waveguide.
    Type: Grant
    Filed: August 23, 2012
    Date of Patent: April 15, 2014
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Mikhail Brodsky, Cristian Antonelli, Jungmi Oh
  • Patent number: 8611535
    Abstract: A quantum key distribution system comprises a source of entangled photon pairs and two single-photon detectors. The source is coupled to each of the single-photon detectors by optical fiber. Operational systems parameters include the efficiency of the first single-photon detector, the efficiency of the second single-photon detector, and the maximum average number of photon pairs per unit time generated by the source. To characterize the operational systems parameters, the transmittances between the source and each single-photon detector are determined. The dark count probability of the first single-photon detector and the dark count probability of the second single-photon detector are determined. The count probability at the first single-photon detector, the count probability at the second single-photon detector, and the coincidence count probability are determined as a function of the optical power from the source.
    Type: Grant
    Filed: September 15, 2010
    Date of Patent: December 17, 2013
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
  • Publication number: 20120321301
    Abstract: A quantum key distribution system is deployed in an optical fiber network transporting classical data traffic. A source of entangled photon pairs is used to generate quantum keys. Classical data traffic is typically transported over channels in the C-band. If a pair of channels for transport of quantum data is available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in the C-band. If a pair of channels for transport of quantum data is not available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in a combined S-band and L-band. When a periodically-poled lithium niobate waveguide pumped with a laser is used for the source of entangled photon pairs, the output spectral properties are tuned by varying the temperature of the waveguide.
    Type: Application
    Filed: August 23, 2012
    Publication date: December 20, 2012
    Applicant: AT&T INTELLECTUAL PROPERTY I, L.P.
    Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
  • Patent number: 8285515
    Abstract: Operational parameters of a single-photon detector are determined with a source of photon pairs. At a fixed trigger, a dark count probability and a series of count probabilities at different optical powers are determined. A particular optical power is selected by adjusting the optical power of the source of photon pairs. The dark count probability and the count probabilities are determined for different trigger rates. The operational parameters include efficiency, afterpulsing constant, and detrap time. The operational parameters are computed by fitting the computed dark count probabilities and count probabilities to a user-defined relationship.
    Type: Grant
    Filed: July 13, 2010
    Date of Patent: October 9, 2012
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
  • Patent number: 8280250
    Abstract: A quantum key distribution system is deployed in an optical fiber network transporting classical data traffic. A source of entangled photon pairs is used to generate quantum keys. Classical data traffic is typically transported over channels in the C-band. If a pair of channels for transport of quantum data is available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in the C-band. If a pair of channels for transport of quantum data is not available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in a combined S-band and L-band. When a periodically-poled lithium niobate waveguide pumped with a laser is used for the source of entangled photon pairs, the output spectral properties are tuned by varying the temperature of the waveguide.
    Type: Grant
    Filed: September 15, 2010
    Date of Patent: October 2, 2012
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
  • Patent number: 8160442
    Abstract: Systems and methods are described that measure the OSNR of an optical channel. Embodiments provide OSNR measurement methods that distinguish the intensities of the coherent modulated signal from the incoherent noise intensity occupying the same optical band using a calibration factor ?.
    Type: Grant
    Filed: September 15, 2008
    Date of Patent: April 17, 2012
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Mikhail Brodsky, Mark David Feuer, Lynn E. Nelson, Jungmi Oh
  • Patent number: 8160443
    Abstract: Systems and methods are described that measure the OSNR of an optical channel. Embodiments provide OSNR measurement methods that distinguish the intensities of the coherent modulated signal from the incoherent noise intensity occupying the same optical band using a calibration factor ?.
    Type: Grant
    Filed: September 15, 2008
    Date of Patent: April 17, 2012
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Mikhail Brodsky, Mark David Feuer, Lynn E. Nelson, Jungmi Oh
  • Patent number: 8139952
    Abstract: Systems and methods are described that derive a relationship between an optical transmitter's extinction ratio (Er) and its interferogram wing-to-peak ratio (Iwp). The change in an optical transmitter's Iwp correlates with a change in measured Er. As the Er of a telecom signal changes, the power of the modulated signal's interferogram wings change. After a relationship between Iwp and measured Er has been derived for an optical transmitter, the relationship may be used after deployment to determine an Er by measuring an Iwp.
    Type: Grant
    Filed: March 23, 2009
    Date of Patent: March 20, 2012
    Assignee: AT&T Intellectual Property I, LP
    Inventors: Lynn E. Nelson, Mikhail Brodsky, Jungmi Oh, Cristian Antonelli, Paul Shala Henry
  • Publication number: 20120063769
    Abstract: A quantum key distribution system is deployed in an optical fiber network transporting classical data traffic. A source of entangled photon pairs is used to generate quantum keys. Classical data traffic is typically transported over channels in the C-band. If a pair of channels for transport of quantum data is available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in the C-band. If a pair of channels for transport of quantum data is not available within the C-band, then the source of entangled photon pairs is tuned to emit in a pair of channels in a combined S-band and L-band. When a periodically-poled lithium niobate waveguide pumped with a laser is used for the source of entangled photon pairs, the output spectral properties are tuned by varying the temperature of the waveguide.
    Type: Application
    Filed: September 15, 2010
    Publication date: March 15, 2012
    Applicant: AT&T INTELLECTUAL PROPERTY I, L.P.
    Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
  • Publication number: 20120063596
    Abstract: A quantum key distribution system comprises a source of entangled photon pairs and two single-photon detectors. The source is coupled to each of the single-photon detectors by optical fiber. Operational systems parameters include the efficiency of the first single-photon detector, the efficiency of the second single-photon detector, and the maximum average number of photon pairs per unit time generated by the source. To characterize the operational systems parameters, the transmittances between the source and each single-photon detector are determined. The dark count probability of the first single-photon detector and the dark count probability of the second single-photon detector are determined. The count probability at the first single-photon detector, the count probability at the second single-photon detector, and the coincidence count probability are determined as a function of the optical power from the source.
    Type: Application
    Filed: September 15, 2010
    Publication date: March 15, 2012
    Applicant: AT&T INTELLECTUAL PROPERTY I, L.P.
    Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh