Eavesdropping Patents (Class 398/40)
  • Patent number: 12244338
    Abstract: This application discloses a same-cable probability detection method. The method includes: obtaining a first characteristic parameter of a first optical signal and a second characteristic parameter of a second optical signal, where the first optical signal is a signal transmitted in a first optical fiber, the second optical signal is a signal transmitted in a second optical fiber, the first characteristic parameter is generated after the first optical signal is affected by a vibration of the first optical fiber, and the second characteristic parameter is generated after the second optical signal is affected by a vibration of the second optical fiber; and obtaining, based on the first characteristic parameter and the second characteristic parameter, a probability that at least one optical cable segment of the first optical fiber and at least one optical cable segment of the second optical fiber include a same-cable segment.
    Type: Grant
    Filed: September 22, 2022
    Date of Patent: March 4, 2025
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Xianlong Luo, Chunhui Chen, Minghui Fan
  • Patent number: 12216776
    Abstract: A system for noise-resistant quantum communication using hyperentanglement includes a quantum system that includes a plurality of qubits, a processor, and a memory. The memory includes instructions stored thereon, which, when executed by the processor, cause the quantum system to access a signal of a quantum system that includes a plurality of qubits and obtain hyperentanglement of the plurality of qubits via an entanglement source. The hyperentanglement of the plurality of qubits is in at least two dimensions, including a first dimension and a second dimension. The instructions, when executed, further cause the quantum system to transmit the hyperentangled plurality of qubits via a communication channel; perform a communication of the signal with the first dimension of the at least two dimensions; and filter results of the communicated signal based on the second dimension of the at least two dimensions.
    Type: Grant
    Filed: November 10, 2022
    Date of Patent: February 4, 2025
    Assignees: University of Maryland, College Park, POSTECH RESEARCH AND BUSINESS DEVELOPMENT FOUNDATION
    Inventors: Giuliano Scarcelli, Yoon-Ho Kim, Jin-Hun Kim
  • Patent number: 12200115
    Abstract: There is herein disclosed a system for performing Quantum Key Distribution, the system including a transmitter adapted to transmit a plurality of optical pulses, a first receiver, a second receiver, an optical switch with an input which is in optical communication with the transmitter, the switch being switchable between a first switching position in which the input is optically connected to the first receiver, and a second switching position in which the input is optically connected to the second receiver, the system further including a guide for guiding a portion of the plurality of optical pulses to the first receiver via an optical path that bypasses the optical switch.
    Type: Grant
    Filed: March 11, 2020
    Date of Patent: January 14, 2025
    Assignee: British Telecommunications Public Limited Company
    Inventor: Andrew Lord
  • Patent number: 12184767
    Abstract: An imaging and quantum cryptography apparatus comprising a light-refracting optical setup (10 a light-directing optical setup (102), an imaging sensor (103) capturing light refracted the light-refracting optical setup and directed to the imaging sensor by the light-directing optical setup and at least one of a quantum distribution (QKD) transmitter (104) generating a QKD light signal and transmitting QKD light signal via the light-directing optical setup and through the light-refracting optical setup and a QKD receiver (105) acquiring and decoding light signals refracted from the light-refracting optical setup and directed to the QKD receiver by the light-directing optical setup. The imaging sensor, the at least one of QKD transmitter and QKD receiver, and the alignment unit, all use the same light-directing optical setup and the same light-refracting optical setup.
    Type: Grant
    Filed: May 12, 2023
    Date of Patent: December 31, 2024
    Assignee: IMAGESAT INTERNATIONAL (I.S.I.) LTD.
    Inventors: Doron Shterman, Shlomo Indy
  • Patent number: 12164631
    Abstract: An arrangement and method for detecting number splitting attacks in quantum key distribution systems is disclosed. According to the method, a receiver may detect the presence of an eavesdropper on a transmission channel by detecting an increase in the percent difference between the photon transmission rates of two signals of different wavelengths. The receiver may directly measure a percent difference in photon receive rates as between the two signals, and compare the measured difference with an expected difference. The expected difference may be known, or may be measured by the receiver on the basis of historical data. The expected difference may be computed from the percent difference between the means of the Poisson distributions of the transmitter's laser sources, which may be determined a priori and communicated to the transmitter.
    Type: Grant
    Filed: December 7, 2022
    Date of Patent: December 10, 2024
    Assignee: ARIZONA BOARD OF REGENTS ON BEHALF OF NORTHERN ARIZONA UNIVERSITY
    Inventors: Julie B. Heynssens, Bertrand F. Cambou
  • Patent number: 12058247
    Abstract: A method of providing a secure communication service using a secure communication device equipped with a quantum-random-number-based encryption chip. The method includes: in response to a first user terminal executing a secure communication device service app for secure communication and inputting a personal information number (PIN) or pattern, performing device authentication between a first user secure communication device and the first user terminal and then performing remote authentication between the first user terminal and a management server; in response to user authentication being completed, generating a quantum secret key a by a quantum encryption chip of the first user secure communication device and transmitting a quantum public key A to a second user secure communication device; and creating, by the first user secure communication device, a speech secure communication channel for communication with the second user secure communication device by inducing and storing the quantum encryption key.
    Type: Grant
    Filed: February 17, 2021
    Date of Patent: August 6, 2024
    Assignee: EYL INC.
    Inventors: Bu Suk Jeong, Dae Hyun Nam, Jung Hyun Baik, Seong Joon Cho, Kang Won Suh
  • Patent number: 12047163
    Abstract: Techniques are described for implementing an out-of-band communication channel used to exchange control channel information in sub-carrier-based optical communication systems. In an example implementation, a transmitter includes a laser operable to supply an optical signal, a digital signal processor operable to supply first electrical signals based on first data input to the digital signal processor and second data input to the digital signal processor, digital-to-analog conversion circuitry operable to output second electrical signals based on the first electrical signals, modulator driver circuitry is operable to output third electrical signals based on the second electrical signals, and an optical modulator operable to supply first and second modulated optical signals based on the third electrical signals. The first modulated optical signal includes a plurality of optical subcarriers carrying user data. The plurality of optical subcarriers also being amplitude modulated to carry control information.
    Type: Grant
    Filed: November 15, 2021
    Date of Patent: July 23, 2024
    Assignee: Infinera Corporation
    Inventors: Christopher Fludger, Syed Muhammad Bilal, Demin Yao, Xiang Chen, Han Henry Sun, Byungyoon Min, William Isaac, Zihao Liu, Yuanqing Li
  • Patent number: 12034841
    Abstract: Embodiments are disclosed for a quantum key distribution enabled intra-datacenter network. An example system includes a first vertical cavity surface emitting laser (VCSEL), a second VCSEL and a network interface controller. The first VCSEL is configured to emit a first optical signal associated with data. The second VCSEL is configured to emit a second optical signal associated with quantum key distribution (QKD). Furthermore, the network interface controller is configured to manage transmission of the first optical signal associated with the first VCSEL and the second optical signal associated with the second VCSEL via an optical communication channel coupled to a network interface module.
    Type: Grant
    Filed: April 18, 2023
    Date of Patent: July 9, 2024
    Assignee: Mellanox Technologies, Ltd.
    Inventors: Elad Mentovich, Itshak Kalifa, Ioannis (Giannis) Patronas, Paraskevas Bakopoulos, Eyal Waldman
  • Patent number: 11985457
    Abstract: A communication device in a communication system in which functions that are converted to software are configured as a plurality of components, and the functions are realized as a result of the components being respectively executed by a plurality of communication devices that are connected to a network, the communication device including a capsulation function unit configured to encapsulate information that is to be transmitted to another communication device.
    Type: Grant
    Filed: August 2, 2019
    Date of Patent: May 14, 2024
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Tomoya Hatano, Manabu Yoshino
  • Patent number: 11848711
    Abstract: Embodiments are disclosed for facilitating quantum computing over classical and quantum communication channels. An example system includes a network interface card (NIC) apparatus. The NIC apparatus includes an optical receiver, an embedded processor, and a network switch. The optical receiver is configured to receive qubit data via a first communication channel associated with quantum communication. The embedded processor is configured to convert the qubit data into binary bit data. The network switch is configured to output the binary bit data via a second communication channel associated with classical network communication.
    Type: Grant
    Filed: February 18, 2022
    Date of Patent: December 19, 2023
    Assignee: MELLANOX TECHNOLOGIES, LTD.
    Inventors: Juan Jose Vegas Olmos, Elad Mentovich, Liran Liss, Yonathan Piasetzky
  • Patent number: 11777723
    Abstract: A transmitter Continuous-Variable Quantum Key Distribution (CV-QKD) device stores and transmits a quantum signal over a communication channel. A receiver CV-QKD device receives the quantum signal via the communication channel and via a reception band. The receiver CV-QKD device determines a quantum communication channel. The receiver CV-QKD device communicates the determined quantum communication channel to the transmitter CV-QKD device over an authenticated communication channel. The transmitter CV-QKD device obtains a modified quantum signal by modifying the stored quantum signal based on the determined quantum communication channel. The transmitter CV-QKD device and the receiver CV-QKD device generate a secret key using the modified quantum signal and the received quantum signal.
    Type: Grant
    Filed: July 9, 2021
    Date of Patent: October 3, 2023
    Assignee: Huawei Technologies Duesseldorf GmbH
    Inventor: Hans Brunner
  • Patent number: 11736282
    Abstract: A transmitter Continuous-Variable Quantum Key Distribution (CV-QKD) device stores and transmits a quantum signal over a communication channel. A receiver CV-QKD device receives the quantum signal via the communication channel and via a reception band. The receiver CV-QKD device determines a quantum communication channel. The receiver CV-QKD device communicates the determined quantum communication channel to the transmitter CV-QKD device over an authenticated communication channel. The transmitter CV-QKD device obtains a modified quantum signal by modifying the stored quantum signal based on the determined quantum communication channel. The transmitter CV-QKD device and the receiver CV-QKD device generate a secret key using the modified quantum signal and the received quantum signal.
    Type: Grant
    Filed: July 9, 2021
    Date of Patent: August 22, 2023
    Assignee: Huawei Technologies Duesseldorf GmbH
    Inventor: Hans Brunner
  • Patent number: 11719530
    Abstract: A method and a system for generating independent coherent photons frequency-stabilized to transition of atoms for long-distance quantum communication are provided. The method for generating independent coherent photons frequency-stabilized to transition of atoms for long-distance quantum communication according to the present disclosure, includes generating a photon in a quantum state from a first quantum light source including an alkali atom or an ensemble of alkali atoms therein as a medium, further generating a photon in a quantum state from a second quantum light source spatially separated from the first quantum light source, including the same medium as that of the first quantum light source therein, and oscillating a photon pair obtained by coupling the photons generated by the first and second quantum light sources as a continuous wave coherent photon (CWCP) for quantum communication.
    Type: Grant
    Filed: January 10, 2022
    Date of Patent: August 8, 2023
    Assignee: PUSAN NATIONAL UNIVERSITY INDUSTRY-UNIVERSITY COOPERATION FOUNDATION
    Inventors: Han Seb Moon, Heon Oh Kim, Dan Bi Kim
  • Patent number: 11700109
    Abstract: A receiver for recognizes blinding attacks in a quantum encrypted channel having an optical fiber. The receiver includes a multipixel detector having a plurality of pixels, and configured to be illuminated by a light beam outputted by the optical fiber. A processing unit connects to the multipixel detector and is configured to determine the presence of a blinding attack if a predetermined number of pixels detects light within a predetermined interval. The receiver recognizes blinding attacks in a quantum encrypted channel and implements a method for recognizing blinding attacks in a quantum encrypted channel.
    Type: Grant
    Filed: May 24, 2022
    Date of Patent: July 11, 2023
    Assignee: ID Quantique SA
    Inventors: Félix Bussières, Gaëtan Gras
  • Patent number: 11652618
    Abstract: An imaging and quantum cryptography apparatus comprising alight-refracting optical setup (101), a light-directing optical setup (102), an imaging sensor (103) capturing light refracted from the light-refracting optical setup and directed to the imaging sensor by the light-directing optical setup and at least one of a quantum key distribution (QKD) transmitter (104) generating a QKD light signal and transmitting the QKD light signal via the light-directing optical setup and through the light-refracting optical setup and a QKD receiver (105) acquiring and decoding light signals refracted from the light-refracting optical setup and directed to the QKD receiver by the light-directing optical setup. The imaging sensor, the at least one of QKD transmitter and QKD receiver, and the alignment unit, all use the same light-directing optical setup and the same light-refracting optical setup.
    Type: Grant
    Filed: February 26, 2020
    Date of Patent: May 16, 2023
    Assignee: IMAGESAT INTERNATIONAL (I.S.I.) LTD.
    Inventors: Doron Shterman, Shlomo Indy
  • Patent number: 11620107
    Abstract: The invention is directed to a Quantum Random Number Generator comprising an emitting device (110) triggered by a signal representing an input bit x and adapted to generate and send a physical system (130) characterized by one of two possible quantum states determined by said input bit x, a measurement device (120) adapted to detect said physical system, to identify the quantum state of said physical system through an unambiguous state discrimination measurement and to generate an output b first representing whether the quantum state has been identified or not and, if it has been identified, which quantum state among the two possible quantum states was detected by the unambiguous state discrimination measurement to a processing device (140), the processing device (140) being adapted to estimate the entropy of the output b given the probabilities p(b|x) representing the probability of observing output b for a state preparation x, and a randomness extraction device (150) adapted to extract final random bit stre
    Type: Grant
    Filed: October 6, 2017
    Date of Patent: April 4, 2023
    Assignee: UNIVERSITÉ DE GENÈVE
    Inventors: Anthony Christophe Mickaël Martin, Nicolas Brunner, Hugo Zbinden, Jonatan Brask, Joseph Bowles
  • Patent number: 11496817
    Abstract: Systems and methods include, responsive to obtaining measurement data from an optical network and determining viability of a plurality of paths based on Signal-to-Noise Ratio (SNR) and availability of the plurality of paths, providing a User Interface (UI) that displays one or more photonic services and a path viability visualization for each of the one or more photonic services, wherein the path viability visualization, for each photonic service, includes visual elements for available paths of the plurality of paths and an indicator associated with each visual element indicative of path viability; and updating the UI responsive to a change in any of the viability and the availability of the plurality of paths. The steps can further include periodically obtaining the measurement data from the optical network and determining the viability of the plurality of paths.
    Type: Grant
    Filed: July 1, 2021
    Date of Patent: November 8, 2022
    Assignee: Ciena Corporation
    Inventors: Alex W. MacKay, Christiane Louise Campbell, David W. Boertjes, John K. Oltman, Tommaso D'Ippolito
  • Patent number: 11431410
    Abstract: A free space optical communications transmitter terminal including an optical source arranged to provide a first beam of light encoding information to be communicated; an optical source arranged to provide photons encoding bits of a key of a Quantum Key Distribution protocol; and an optics arrangement. The first beam and the photons are linearly polarised. The optics arrangement is configured to combine the first beam and the photons into a single, second, beam to be transmitted to a receiver terminal; and transform the linear polarisation of the first beam into one of left and right circular polarisation and transform the linear polarisation of the photons into the other of left and right circular polarisation. A receiver terminal receives the second beam, transforms the circular polarisations into orthogonal linear polarisations, and filters out the linear polarisation of the first beam to allow the photons to pass to a single photon detector.
    Type: Grant
    Filed: August 27, 2021
    Date of Patent: August 30, 2022
    Assignee: AIRBUS (SAS)
    Inventors: Crisanto Quintana Sanchez, Gavin Erry, Yoann Thueux
  • Patent number: 11405115
    Abstract: A method includes receiving Bell pairs. Photons are obtained in a Greenberger-Hom-Zeilinger (GHZ) state by providing, to a first beam splitter, a photon from a first Bell pair and a photon from a second Bell pair. The first beam splitter is coupled with a first output channel and a second output channel. Obtaining the photons in the GHZ state further includes providing, to a second beam splitter, a photon from a third Bell pair and a photon from a fourth Bell pair. The second beam splitter is coupled with a third output channel arid a fourth output channel. Obtaining the photons in the GHZ state further includes providing a photon output from the second output channel as a first input to a detector and a photon output in the third output channel a second input to the first detector.
    Type: Grant
    Filed: March 22, 2019
    Date of Patent: August 2, 2022
    Assignee: PSIQUANTUM CORP.
    Inventors: Mercedes Gimeno-Segovia, Terence G. Rudolph
  • Patent number: 11386211
    Abstract: An example described herein may involve receiving a temperature measurement associated with an input component, wherein the temperature measurement is received from a temperature sensor, and wherein the temperature measurement indicates a temperature of an input element of the input component; determining that the temperature of the input element satisfies a threshold temperature; and causing an infrared element to emit infrared light in association with a position of the input component. While the infrared element is emitting the infrared light, capture information associated with a user interacting with the input component may be obfuscated.
    Type: Grant
    Filed: October 3, 2019
    Date of Patent: July 12, 2022
    Assignee: Capital One Services, LLC
    Inventors: Jeremy Goodsitt, Austin Walters, Reza Farivar
  • Patent number: 11245486
    Abstract: A communications system receives a plurality of input data streams and applies a different orthogonal function to each of the plurality of input data streams. The system processes each of the plurality of input data streams to spatially locate a first group of the plurality of input data streams onto a first carrier signal and to spatially locate a second group of the plurality of input data streams onto a second carrier signal. The system temporally locates the first carrier signal and the second carrier signal onto a third carrier signal and transmits the third carrier signal over a communications link.
    Type: Grant
    Filed: October 13, 2015
    Date of Patent: February 8, 2022
    Assignee: NXGEN PARTNERS IP, LLC
    Inventors: Solyman Ashrafi, Roger D. Linquist
  • Patent number: 10282560
    Abstract: A security code input may be obfuscated from a thermal imaging device by randomly heating a random set of inputs of an input device. The security code is inputted on an input device, which communicates with a security system to grant or deny access to a user based on an entry of the security code. The input device includes a plurality of hearing elements. The input device may receive an input from the user. A random set of heating elements including one or more heating elements, are generated from the plurality of heating elements. A temperature is determined for the one or more heating elements of the random set of heating elements. The temperature is then applied to the one or more heating elements of the random set of heating elements of the input device.
    Type: Grant
    Filed: August 26, 2015
    Date of Patent: May 7, 2019
    Assignee: International Business Machines Corporation
    Inventor: Brendan Murray
  • Patent number: 9112617
    Abstract: The invention relates to a method for monitoring a detachable fiber-optic connection, especially in a fiber-optic transmission device or system, comprising the steps of transmitting a wanted optical transmission signal carrying information data to be transmitted to at least one fiber-optic connection, a predetermined portion of the power of said optical transmission signal being reflected at the at least one fiber-optic connection depending on the status and properties of the at least one fiber-optic connection, creating a detection signal by detecting said reflected predetermined portion of the power of said optical transmission signal, monitoring and evaluating the detection signal as a function of time and creating a “DETECT” signal if the detection signal or a signal derived from the detection signal reveals a characteristic change in its course in time. Further, the invention relates to a corresponding device adapted to realize this method.
    Type: Grant
    Filed: November 8, 2011
    Date of Patent: August 18, 2015
    Assignee: ADVA Optical Networking SE
    Inventors: Michael Eiselt, Wesley Doonan
  • Patent number: 8879912
    Abstract: A bandwidth control method used in a case where, for example, a first communication device (OLT) allocates a bandwidth for signal transmission to each of a plurality of second communication devices (ONUs) connected to the OLT in a communication system having the OLT and the ONUs includes a sleep controlling of shifting devices among the ONUs that satisfy a predetermined condition into a power saving state, a control-target selecting of selecting control target devices among the ONUs based on a result of performing the sleep controlling, and a bandwidth determining of determining a bandwidth to be allocated to the selected control target devices.
    Type: Grant
    Filed: January 28, 2010
    Date of Patent: November 4, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Seiji Kozaki, Takashi Nishitani, Masaki Tanaka
  • Patent number: 8842987
    Abstract: An optical network including at least one optical network node that receives an optical signal for either transmission or reception. The optical network node analyzes the optical signal and applies communication protocols necessary for optical transmission or reception of the optical signal to or from the optical network. At least one communication module is coupled to the at least one optical network node either decodes or encodes the optical signal by identifying or adding at least one wavelength to the optical signal for security.
    Type: Grant
    Filed: October 3, 2012
    Date of Patent: September 23, 2014
    Assignee: FMR LLC
    Inventor: Richard Lee
  • Patent number: 8798455
    Abstract: The present disclosure relates to fiber optic networks carrying sensitive information such as classified government communications, sensitive financial information, proprietary corporate information, and associated systems and methods for secure transmission where fiber tampering is easily detected. The present invention provides improved security systems and methods for fiber optic communication links. Specifically, a hollow-core photonic bandgap fiber is deployed as a transmission medium. A secure fiber optic communication link is established over the hollow-core photonic bandgap fiber with a monitoring mechanism. The monitoring mechanism is configured to detect large losses and large spectral variability each indicative of loss introduced by malicious intrusion attempts. Further, the monitoring mechanism allows easy differentiation of intrusion relative to normal system variations thereby reducing false positives and missed intrusions.
    Type: Grant
    Filed: April 28, 2010
    Date of Patent: August 5, 2014
    Assignee: Ciena Corporation
    Inventor: Michael Y. Frankel
  • Patent number: 8774641
    Abstract: The first photon in single-photon state is divided into two components by the half beam splitter, and the first component is sent to the sender while the second component is sent to the receiver. The sender measures the first component of the first photon when he sends “1”. The sender doesn't measure the first component of the first photon when he sends “0”. The receiver makes the second component of the first photon enter into the Sagnac interferometer, and the receiver also makes the reference light enter into the Sagnac interferometer at the same time. The receiver makes the second component of the first photon interact with the reference light in the nonlinear optical medium arranged in the Sagnac interferometer. The receiver knows the signal from the phase modulation of the reference light caused by the interaction with the second component of the first photon.
    Type: Grant
    Filed: April 17, 2012
    Date of Patent: July 8, 2014
    Inventor: Narumi Ohkawa
  • Patent number: 8755687
    Abstract: A communication system comprising an emitter of weak light pulses, a detector which is capable of detecting single photons, and a source of a clock signal, wherein said emitter and detector are synchronized using said clock signal, the system further comprising a frequency divider for said clock signal to produce a reduced frequency clock signal and a clock regenerator for regenerating the original clock signal from the reduced frequency clock signal, the system further comprising a communication channel configured to communicate the clock signal between the emitter and detector, the clock signal being reduced before sending through said channel and reconstructed after it has exited said channel.
    Type: Grant
    Filed: May 21, 2012
    Date of Patent: June 17, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: James Dynes, Zhiliang Yuan, Andrew W. Sharpe, Andrew James Shields
  • Patent number: 8750705
    Abstract: A method for protecting a data entry device from eavesdropping includes masking a signature of entry resulting from entry of data by a user of the data entry device so as to reduce the detectability of the signature by eavesdropping. The signature may include a temperature differential in the data entry device from data entry by the user and the masking may include controlling the external temperature of the data entry device to reduce temperature differentials left in the data entry device by the user. Alternatively, the signature may include sound waves emitted from the data entry device and the masking may include masking sound waves emitted from the data entry device to reduce the detectability of the sound waves. A system may also be employed for protecting data entry to a data entry device from eavesdropping.
    Type: Grant
    Filed: June 22, 2011
    Date of Patent: June 10, 2014
    Assignee: International Business Machines Corporation
    Inventors: Bruce Dickson, David Louis Kaminsky, Marcia Lambert Peters Stockton
  • Patent number: 8688417
    Abstract: In one embodiment, an event impact signature detector may analyze a time series with external events. A data interface 250 may receive a data set 310 representing the time series with external events. A processor 220 may fit the data set 310 into a baseline time series model 330. The processor 220 may iteratively determine each event location 352 for multiple external events 350 affecting the baseline time series model 330. The processor 220 may iteratively solve for each event impact 354 of the multiple external events 350 factoring in interactions between the multiple external events 350.
    Type: Grant
    Filed: June 17, 2011
    Date of Patent: April 1, 2014
    Assignee: Microsoft Corporation
    Inventors: Alex Bocharov, Christopher A. Meek, Bo Thiesson
  • Patent number: 8542994
    Abstract: In a PON system in which communication is performed at a plurality of types of transmission rate (L, M, and H) in an upstream direction from a plurality of terminals connected to a station apparatus through optical fibers, within a discovery period for allowing an unregistered terminal to be recognized by station apparatus, the terminal makes a discovery response at one type of transmission rate (L). With this configuration, station apparatus can wait for a discovery response with a receive function being allowed to support transmission rate (L).
    Type: Grant
    Filed: December 31, 2012
    Date of Patent: September 24, 2013
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Hiroshi Murata
  • Patent number: 8364035
    Abstract: In a PON system in which communication is performed at a plurality of types of transmission rate (L, M, and H) in an upstream direction from a plurality of terminals connected to a station apparatus through optical fibers, within a discovery period for allowing an unregistered terminal to be recognized by station apparatus, the terminal makes a discovery response at one type of transmission rate (L). With this configuration, station apparatus can wait for a discovery response with a receive function being allowed to support transmission rate (L).
    Type: Grant
    Filed: January 18, 2012
    Date of Patent: January 29, 2013
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Hiroshi Murata
  • Patent number: 8347075
    Abstract: The present invention provides methods to mitigate the problems associated with MAC address spoofing and denial of service attacks in an FTTH network system. The MAC address spoofing attack may occur when a computer hacker configures his computer to change the MAC address of a data signal to deceive the receiver of the signal's source address. The denial of service may occur when a computer hacker floods a file server with data packets. The present invention mitigates these attacks by modifying the software of certain components of the FTTH network system to enable the components to insert virtual MAC addresses, tags and codes into the data packets that identify a component of the communication related to the address of the source computer.
    Type: Grant
    Filed: November 1, 2002
    Date of Patent: January 1, 2013
    Assignee: Verizon Laboratories Inc.
    Inventor: Muxiang Zhang
  • Patent number: 8218966
    Abstract: A technique for securing data transmission via an optical communication line comprising an optical fiber extending between a first network element and a second network element; the technique comprises conveying a first optical signal carrying data via the optical fiber from the first network element towards the second network element at a predetermined optical wavelength, and conveying a second optical signal at the same predetermined optical wavelength via the same fiber in the opposite direction to create within the optical fiber a combined optical signal such that combination of the first and second optical signals is adapted to hamper an unauthorized non-intrusive extraction of the first optical signal from the combined optical signal.
    Type: Grant
    Filed: June 29, 2008
    Date of Patent: July 10, 2012
    Assignee: ECI Telecom Ltd.
    Inventors: Michael Gutin, Uri Mahlab
  • Patent number: 8184972
    Abstract: Data is encrypted onto an electromagnetic beam by providing an electromagnetic beam having a signal component having a modal state, wherein the signal component is susceptible to accumulation of a geometric phase, and a reference component, transmitted along a path over at least part of which the signal component accumulates a geometric phase by transformation of its modal state from a first to a second modal state, from the second to at least one further modal state, and then back to the first modal state; and modulating with the data the geometric phase so accumulated, by modulating the modal state transformations. Data is decrypted from a received electromagnetic beam by corresponding processing of the received electromagnetic beam and by comparing an overall phase of the signal component with an overall phase of the reference component so as to retrieve the modulation.
    Type: Grant
    Filed: July 24, 2008
    Date of Patent: May 22, 2012
    Assignee: Fujitsu Limited
    Inventors: Michael Charles Parker, Stuart Douglas Walker
  • Publication number: 20120121260
    Abstract: A system is provided for intercepting signals transmitted between a target served by a fiber optic network and a subscriber. A network is described having a phone switch at a central office configured to receive signals for transmission to and from a target, such as the target of a criminal investigation. A signal received at the central office is assigned to an analog circuit, and a monitoring device configured to intercept and monitor the signal is installed along the analog circuit at a location that allows the monitoring of communications without notifying the target that he is under surveillance. After the signal has been monitored, it is converted to a digital signal for transmission. A method is also provided for intercepting a signal transmitted between the target served by a fiber optic network and a subscriber, such that a monitoring device may be installed without alerting the target.
    Type: Application
    Filed: January 18, 2012
    Publication date: May 17, 2012
    Applicant: VERIZON PATENT AND LICENSING INC.
    Inventors: Robert A. QUAN, James C. JONES, Karen J. JACKSON, Dagmar D. MAYOR, Rosa M. UNDERWOOD
  • Patent number: 8180218
    Abstract: In a PON system in which communication is performed at a plurality of types of transmission rate (L, M, and H) in an upstream direction from a plurality of terminals connected to a station apparatus through optical fibers, within a discovery period for allowing an unregistered terminal to be recognized by station apparatus, the terminal makes a discovery response at one type of transmission rate (L). With this configuration, station apparatus can wait for a discovery response with a receive function being allowed to support transmission rate (L).
    Type: Grant
    Filed: February 19, 2007
    Date of Patent: May 15, 2012
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Hiroshi Murata
  • Publication number: 20120076301
    Abstract: A secure optical communication system and method are disclosed. Short optical pulses are first modulated with data, then dispersed in time so that they spread out over multiple bit periods, then the desired code is applied to the dispersed pulses. The encoding may include frequency shifts or phase shifts or other. The dispersed optical symbols overlap in time so an applied code chip thus acts on multiple symbols simultaneously. There are generally multiple code chips per dispersed symbol. The coding device does not need to be synchronized to the data rate. Multiple wavelength division multiplexed channels may be encoded simultaneously. The signal propagates to a decoder that is synchronized with encoder to apply a complementary code thereby canceling out the effect of the encoder. The encoder and decoder can be realized by varying the wavelength of an optical pump to a parametric amplifier, allowing for a wide-band frequency shift.
    Type: Application
    Filed: September 22, 2011
    Publication date: March 29, 2012
    Inventor: Gregory S. Kanter
  • Patent number: 8135276
    Abstract: A quantum repeater includes a transmitter portion including a source, a set of matter systems, and an optical system. The source produces a probe pulse in a probe state having components with different photon numbers, and each matter system has at least one state that interacts with photons in the probe pulse to introduce a change in a phase space location of the probe state. The optical system can direct the probe pulse for interaction with one of the matter systems and direct light from the matter system for transmission on a first channel.
    Type: Grant
    Filed: August 11, 2006
    Date of Patent: March 13, 2012
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: William J. Munro, Kae Nemoto, Peter Van Loock, Yoshihisa Yamamoto
  • Patent number: 8126327
    Abstract: A system is provided for intercepting signals transmitted between a target served by a fiber optic network and a subscriber. A network is described having a phone switch at a central office configured to receive signals for transmission to and from a target, such as the target of a criminal investigation. A signal received at the central office is assigned to an analog circuit, and a monitoring device configured to intercept and monitor the signal is installed along the analog circuit at a location that allows the monitoring of communications without notifying the target that he is under surveillance. After the signal has been monitored, it is converted to a digital signal for transmission. A method is also provided for intercepting a signal transmitted between the target served by a fiber optic network and a subscriber, such that a monitoring device may be installed without alerting the target.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: February 28, 2012
    Assignee: Verizon Patent and Licensing Inc.
    Inventors: Robert A Quan, James C Jones, Karen Jackson, Dagmar D Mayor, Rosa M Underwood
  • Patent number: 8015593
    Abstract: A method for protecting a data entry device from eavesdropping includes masking a signature of entry resulting from entry of data by a user of the data entry device so as to reduce the detectability of the signature by eavesdropping. The signature may include a temperature differential in the data entry device from data entry by the user and the masking may include controlling the external temperature of the data entry device to reduce temperature differentials left in the data entry device by the user. Alternatively, the signature may include sound waves emitted from the data entry device and the masking may include masking sound waves emitted from the data entry device to reduce the detectability of the sound waves. A system may also be employed for protecting data entry to a data entry device from eavesdropping.
    Type: Grant
    Filed: April 21, 2008
    Date of Patent: September 6, 2011
    Assignee: International Business Machines Corporation
    Inventors: Bruce Dickson, David Louis Kaminsky, Marcia Lambert Peters Stockton
  • Patent number: 8000601
    Abstract: A method and apparatus for securing an optical communication link includes the step of identifying a profile of the link by measuring, at the transmitter, optical back-reflections from optical pulses forwarded to a receiver. The profile is stored at the transmitter. Periodically during operation, such as during key exchange, more optical pulses are forwarded to the receiver, and the back reflections are collected as periodic profiles. The periodic profiles are compared against the stored profiles. Eavesdroppers, such as those who cut the fiber, tap the fiber, or implement a man in the middle attack, may be easily identified because the losses caused by their interference with the fiber will be evident in the periodic profiles.
    Type: Grant
    Filed: January 8, 2009
    Date of Patent: August 16, 2011
    Assignee: Nortel Networks Limited
    Inventors: Bruce Schofield, Franco Travostino, Indermohan Monga, Victor Flrolu
  • Patent number: 7949254
    Abstract: To achieve secure optical communications, a messaging encoding scheme is utilized in which optical communication signals are encoded based upon a known unique code. This encoding methodology allows for the broad transmission across an optical network which will include intended destination. Only the intended destination or destinations will include the necessary unique codes to allow recognition and decoding of the optically encoded message. By providing security in this optical encoding manner, the need for additional message overhead and/or additional systems is thus avoided, thereby providing efficient communication in a secure manner.
    Type: Grant
    Filed: December 27, 2007
    Date of Patent: May 24, 2011
    Assignee: Lockheed Martin Corporation
    Inventor: Rick C. Stevens
  • Patent number: 7945168
    Abstract: Photonic signals are tagged with a pre-selected modification, such as a polarization signature to carry data across an obstructed path between sender and receiver. Communication authentication through polarization variation allows for Yuen-Kumar or entangled photon quantum communication protocols to propagate through environmental scattering media such as air, smoke, fog, rain, and water. While ultraviolet light photons are well suited as a carrier for quantum communication signals scattered in air, it is appreciated that visible wavelengths have longer propagation paths in water to convey non-line-of-sight data. A secure signal is scattered by the media and simultaneously communicated to a single recipient or multiple recipients exposed to scattered signal portions. A process of solving the scattering processes through a random scattering media is provided to reconstruct a quantum keyed message at a receiver.
    Type: Grant
    Filed: August 20, 2010
    Date of Patent: May 17, 2011
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Ronald Everett Meyers, Keith Scott Deacon
  • Patent number: 7903970
    Abstract: Embodiments of optical network evaluation systems and methods are disclosed. One system embodiment, among others, comprises a processor configured with logic to provide a cross layer model of disturbance propagation in an optical network based on a combination of a physical layer model and a network layer model, the physical layer mode based on the disturbance propagation having a threshold effect only on nodes along a route followed by the disturbance.
    Type: Grant
    Filed: March 30, 2007
    Date of Patent: March 8, 2011
    Assignee: Georgia Tech Research Corporation
    Inventors: Guanglei Liu, Chuanyi Ji
  • Patent number: 7903977
    Abstract: A fiber optic communication system including a fiber optic link, a transmitter system and a receiver system. The transmitter system includes a laser source producing a light beam, and a polarization controller receiving the light beam and providing an expected pattern of changing states of polarization to the light beam to output light signals into the fiber optic link to cause the expected pattern of changing states of polarization to be transmitted along the fiber optic link. The receiver system is provided with a polarization analyzer, and a light detector. The light detector receives the light signals transmitted by the transmitter, and forwards data indicative of the light signals to the polarization analyzer. The polarization analyzer analyzing the data with an inverse polarization reference frame and generates an alert based on deviations of the data from the expected pattern of changing states of polarization.
    Type: Grant
    Filed: October 6, 2005
    Date of Patent: March 8, 2011
    Assignee: The Board of Regents of the University of Oklahoma
    Inventors: Gregory G. MacDonald, James J. Sluss, Jr.
  • Patent number: 7899325
    Abstract: A method for protecting a data entry device from eavesdropping includes masking a signature of entry resulting from entry of data by a user of the data entry device so as to reduce the detectability of the signature by eavesdropping. The signature may include a temperature differential in the data entry device from data entry by the user and the masking may include controlling the external temperature of the data entry device to reduce temperature differentials left in the data entry device by the user. Alternatively, the signature may include sound waves emitted from the data entry device and the masking may include masking sound waves emitted from the data entry device to reduce the detectability of the sound waves. A system may also be employed for protecting data entry to a data entry device from eavesdropping.
    Type: Grant
    Filed: November 19, 2007
    Date of Patent: March 1, 2011
    Assignee: International Business Machines Corporation
    Inventors: Bruce Dickson, David Louis Kaminsky, Marcia Lambert Peters Stockton
  • Publication number: 20110019997
    Abstract: A system is provided for intercepting signals transmitted between a target served by a fiber optic network and a subscriber. A network is described having a phone switch at a central office configured to receive signals for transmission to and from a target, such as the target of a criminal investigation. A signal received at the central office is assigned to an analog circuit, and a monitoring device configured to intercept and monitor the signal is installed along the analog circuit at a location that allows the monitoring of communications without notifying the target that he is under surveillance. After the signal has been monitored, it is converted to a digital signal for transmission. A method is also provided for intercepting a signal transmitted between the target served by a fiber optic network and a subscriber, such that a monitoring device may be installed without alerting the target.
    Type: Application
    Filed: September 30, 2010
    Publication date: January 27, 2011
    Applicant: Verizon Patent and Licensing, Inc.
    Inventors: Robert A. QUAN, James C. Jones, Karen J. Jackson, Dagmar D. Mayor, Rosa M. Underwood
  • Patent number: 7835644
    Abstract: A system is provided for intercepting signals transmitted between a target served by a fiber optic network and a subscriber. A network is described having a phone switch at a central office configured to receive signals for transmission to and from a target, such as the target of a criminal investigation. A signal received at the central office is assigned to an analog circuit, and a monitoring device configured to intercept and monitor the signal is installed along the analog circuit at a location that allows the monitoring of communications without notifying the target that he is under surveillance. After the signal has been monitored, it is converted to a digital signal for transmission. A method is also provided for intercepting a signal transmitted between the target served by a fiber optic network and a subscriber, such that a monitoring device may be installed without alerting the target.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: November 16, 2010
    Assignee: Verizon Patent and Licensing Inc.
    Inventors: Robert A. Quan, James C. Jones, Karen J. Jackson, Dagmar D. Mayor, Rosa M. Underwood
  • Patent number: 7822342
    Abstract: An optical communication system is provided. In one embodiment, a source creates a multiplicity of photon pairs, with each photon pair comprising a first photon and a second photon. The first photon is sent to a transmitter, and either remains in the transmitter or is transmitted by the transmitter to a receiver. The second photon is sent to the receiver. Data is decoded by determining a polarization direction and a time of detection of any photon pairs detected at the receiver.
    Type: Grant
    Filed: March 20, 2007
    Date of Patent: October 26, 2010
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Mark W. Roberts, Markham E. Lasher