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).
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Patent number: 11153668Abstract: 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: GrantFiled: February 3, 2020Date of Patent: October 19, 2021Assignee: AT&T Intellectual Property I, L.P.Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
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Publication number: 20200177977Abstract: 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: ApplicationFiled: February 3, 2020Publication date: June 4, 2020Applicant: AT&T Intellectual Property I, L.P.Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
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Patent number: 10595102Abstract: 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: GrantFiled: April 3, 2018Date of Patent: March 17, 2020Assignee: AT&T Intellectual Property I, L.P.Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
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Patent number: 10502619Abstract: 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: GrantFiled: August 29, 2017Date of Patent: December 10, 2019Assignee: AT&T INTELLECTUAL PROPERTY I, L.P.Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
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Publication number: 20180227651Abstract: 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: ApplicationFiled: April 3, 2018Publication date: August 9, 2018Applicant: AT&T Intellectual Property I, L.P.Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
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Patent number: 9967637Abstract: 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: GrantFiled: January 2, 2014Date of Patent: May 8, 2018Assignee: AT&T INTELLECTUAL PROPERTY I, L.P.Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
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Publication number: 20170356797Abstract: 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: ApplicationFiled: August 29, 2017Publication date: December 14, 2017Applicant: AT&T Intellectual Property I, L.P.Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
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Patent number: 9772223Abstract: 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: GrantFiled: May 22, 2015Date of Patent: September 26, 2017Assignee: AT&T Intellectual Property I, L.P.Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
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Publication number: 20150253187Abstract: 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: ApplicationFiled: May 22, 2015Publication date: September 10, 2015Applicant: AT&T INTELLECTUAL PROPERTY I, L.P.Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
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Patent number: 9068881Abstract: 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: GrantFiled: July 13, 2010Date of Patent: June 30, 2015Assignee: AT&T Intelletual Property I, L.P.Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
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Publication number: 20140119729Abstract: 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: ApplicationFiled: January 2, 2014Publication date: May 1, 2014Applicant: AT&T Intellectual Property I, L.P.Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
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Patent number: 8699876Abstract: 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: GrantFiled: August 23, 2012Date of Patent: April 15, 2014Assignee: AT&T Intellectual Property I, L.P.Inventors: Mikhail Brodsky, Cristian Antonelli, Jungmi Oh
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Patent number: 8611535Abstract: 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: GrantFiled: September 15, 2010Date of Patent: December 17, 2013Assignee: AT&T Intellectual Property I, L.P.Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
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Publication number: 20120321301Abstract: 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: ApplicationFiled: August 23, 2012Publication date: December 20, 2012Applicant: AT&T INTELLECTUAL PROPERTY I, L.P.Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
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Patent number: 8285515Abstract: 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: GrantFiled: July 13, 2010Date of Patent: October 9, 2012Assignee: AT&T Intellectual Property I, L.P.Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
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Patent number: 8280250Abstract: 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: GrantFiled: September 15, 2010Date of Patent: October 2, 2012Assignee: AT&T Intellectual Property I, L.P.Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh
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Patent number: 8160442Abstract: 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: GrantFiled: September 15, 2008Date of Patent: April 17, 2012Assignee: AT&T Intellectual Property I, L.P.Inventors: Mikhail Brodsky, Mark David Feuer, Lynn E. Nelson, Jungmi Oh
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Patent number: 8160443Abstract: 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: GrantFiled: September 15, 2008Date of Patent: April 17, 2012Assignee: AT&T Intellectual Property I, L.P.Inventors: Mikhail Brodsky, Mark David Feuer, Lynn E. Nelson, Jungmi Oh
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Patent number: 8139952Abstract: 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: GrantFiled: March 23, 2009Date of Patent: March 20, 2012Assignee: AT&T Intellectual Property I, LPInventors: Lynn E. Nelson, Mikhail Brodsky, Jungmi Oh, Cristian Antonelli, Paul Shala Henry
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Publication number: 20120063596Abstract: 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: ApplicationFiled: September 15, 2010Publication date: March 15, 2012Applicant: AT&T INTELLECTUAL PROPERTY I, L.P.Inventors: Michael Brodsky, Cristian Antonelli, Jungmi Oh