Transmitter And Receiver System Patents (Class 398/140)
  • Patent number: 11328216
    Abstract: The disclosure describes aspects of using multiple species in trapped-ion nodes for quantum networking. In an aspect, a quantum networking node is described that includes multiple memory qubits, each memory qubit being based on a 171Yb+ atomic ion, and one or more communication qubits, each communication qubit being based on a 138Ba+ atomic ion. The memory and communication qubits are part of a lattice in an atomic ion trap. In another aspect, a quantum computing system having a modular optical architecture is described that includes multiple quantum networking nodes, each quantum networking node including multiple memory qubits (e.g., based on a 171Yb+ atomic ion) and one or more communication qubits (e.g., based on a 138Ba+ atomic ion). The memory and communication qubits are part of a lattice in an atomic ion trap. The system further includes a photonic entangler coupled to each of the multiple quantum networking nodes.
    Type: Grant
    Filed: January 8, 2021
    Date of Patent: May 10, 2022
    Assignee: University of Maryland, College Park
    Inventors: Christopher Monroe, Martin Lichtman, Ismail Volkan Inlek, Clayton Crocker, Ksenia Sosnova
  • Patent number: 11281597
    Abstract: Embodiments of the present disclosure are directed toward a universal serial bus (USB) device and a USB host controller. The USB device and USB host controller may be configured to couple to one another via a USB link that may include a high-speed data line and a low-speed data line. The USB device may then transmit, via the high-speed data line, an indication of a digital image to the USB host controller. Other embodiments may be described and/or claimed.
    Type: Grant
    Filed: October 24, 2017
    Date of Patent: March 22, 2022
    Assignee: Intel Corporation
    Inventors: Huimin Chen, Karthi R. Vadivelu, Abdul R. Ismail, Raul Gutierrez
  • Patent number: 11159241
    Abstract: Devices, methods for analog-to-digital converters (ADCs) that perform high-dynamic range measurements based on optical techniques are disclosed. In one example aspect, an optical encoder includes a polarization rotator configured to receive a train of optical pulses, and an electro-optic (EO) modulator coupled to an output of the polarization rotator. The EO modulator is configured to receive a radio frequency (RF) signal and to produce a phase modulated signal in accordance with the RF signal. The optical encoder also includes a polarizing beam splitter coupled to the output of the EO modulator; and an optical hybrid configured to receive two optical signals from the polarizing beam splitter and to produce four optical outputs that are each phase shifted with respect to one another.
    Type: Grant
    Filed: May 11, 2020
    Date of Patent: October 26, 2021
    Assignee: Lawrence Livermore National Security, LLC
    Inventors: Peter Thomas Setsuda DeVore, Apurva Shantharaj Gowda, David Simon Perlmutter, Alexander Thomas Wargo, Jason Thomas Chou
  • Patent number: 11153016
    Abstract: A device including an optoelectric circuit that is configured to provide galvanic isolation between a first circuit and a second circuit is disclosed. The optoelectric circuit includes at least one non-inverting buffer and a metal semiconductor diode. The at least one non-inverting buffer is positioned between a collector of a phototransistor and an anode of a light emitting diode. The metal semiconductor diode is positioned between the collector of the phototransistor and the at least one non-inverting buffer.
    Type: Grant
    Filed: September 28, 2018
    Date of Patent: October 19, 2021
    Assignee: INTERDIGITAL CE PATENT HOLDINGS, SAS
    Inventors: Philippe Marchand, Claude Fouque, Frederique Salou
  • Patent number: 11125773
    Abstract: A method includes sending a probe beam into a beam path that induces a lateral displacement to the probe beam. The probe beam includes a plurality of orthogonal spatial modes that are entangled with each other. The method also includes measuring a phase of each spatial mode from the plurality of orthogonal spatial modes in the probe beam at a detector disposed within a near field propagation regime of the probe beam. The method also includes estimating the lateral displacement of the probe beam based on a phase of each spatial mode from the plurality of spatial modes in the probe beam after the beam path.
    Type: Grant
    Filed: July 7, 2020
    Date of Patent: September 21, 2021
    Assignee: Xanadu Quantum Technologies Inc.
    Inventors: Saikat Guha, Haoyu Qi
  • Patent number: 11128379
    Abstract: [Problem] To accommodate single-band signal processing devices in a high-density manner. [Solution] Provided is a system including: a first signal cable; a second signal cable; a third signal cable; a fourth signal cable; a first multi-band signal processing device that processes a first signal input from the first signal cable and outputs a resultant second signal to the second signal cable; a second multi-band signal processing device that processes a third signal input from the third signal cable and outputs a resultant fourth signal to the fourth signal cable; a first joint box that accommodates the first signal cable, the first multi-band signal processing device, the second signal cable, and the fourth signal cable; and a second joint box that accommodates the second signal cable, the third signal cable, the second multi-band signal processing device, and the fourth signal cable.
    Type: Grant
    Filed: February 20, 2017
    Date of Patent: September 21, 2021
    Assignee: NEC CORPORATION
    Inventor: Koji Inada
  • Patent number: 11121776
    Abstract: A faceplate pluggable remote laser source and system incorporating such a laser source. The system may include an enclosure having a faceplate; a first optical connector, in the faceplate; a laser module; and a loopback fiber cable, connected between the laser module and the first optical connector. The faceplate may form an exterior boundary of the enclosure. The laser module may have a first end including an electrical interface, and a second end including an optical interface. The first end of the laser module may be engaged in a receptacle in the faceplate, and the second end of the laser module may extend outside the faceplate. The laser module may be configured to receive electrical power through the electrical interface, and to produce unmodulated light at the optical interface. The loopback fiber cable and the first optical connector may be configured to route the unmodulated light back into the enclosure.
    Type: Grant
    Filed: August 7, 2020
    Date of Patent: September 14, 2021
    Assignee: Rockley Photonics Limited
    Inventors: Steve Akwaa Aboagye, David Arlo Nelson, Cyriel Johan Agnes Minkenberg, Rajagopal Krishnaswamy
  • Patent number: 11112481
    Abstract: An apparatus for calibrating a differential circuit that includes a differential integrator having an input, a gain, and an output connected to a comparator. The differential integrator output is chargeable to a threshold prior to an integration period. The differential integrator integrates the input during the integration period such that the differential integrator output goes toward zero from the threshold. The comparator detects the output of the differential integrator reaching zero. The apparatus includes a closed-loop gain trim circuit to perform a coarse calibration to adjust and set the gain of the differential integrator and a reference generator that generates the threshold to which the differential integrator output is pre-charged. The reference generator is trimmable during a fine calibration to adjust and set the threshold to correct for residual gain error in the differential circuit remaining after the coarse calibration is performed.
    Type: Grant
    Filed: May 21, 2019
    Date of Patent: September 7, 2021
    Assignee: Cirrus Logic, Inc.
    Inventors: Sarang Vadnerkar, Vinod Jayakumar
  • Patent number: 11108490
    Abstract: A digital receiver is configured to process a polarization multiplexed carrier from a communication network. The polarization multiplexed carrier includes a first polarization and a second polarization. The receiver includes a first lane for transporting a first input signal of the first polarization, a second lane for transporting a second input signal of the second polarization, a dynamic phase noise estimation unit disposed within the first lane and configured to determine a phase noise estimate of the first input signal, a first carrier phase recovery portion configured to remove carrier phase noise from the first polarization based on a combination of the first input signal and a function of the determined phase noise estimate, and a second carrier phase recovery portion configured to remove carrier phase noise from the second polarization based on a combination of the second input signal and the function of the determined phase noise estimate.
    Type: Grant
    Filed: January 9, 2020
    Date of Patent: August 31, 2021
    Assignee: Cable Television Laboratories, Inc.
    Inventors: Zhensheng Jia, Junwen Zhang, Mu Xu, Haipeng Zhang, Luis Alberto Campos, Curtis Dean Knittle
  • Patent number: 11101883
    Abstract: In an optical communications network, the supervisory control signal is duplicating at the OSI layer 2 or layer 3 level to generate a primary supervisory control signal and a secondary supervisory control signal. Access to the primary supervisory control signal is enabled at a network interface of a network device. In response to detecting a failure of the optical communications network or the device, access to the primary supervisory control signal is disabled and access to the secondary supervisory control signal is enabled.
    Type: Grant
    Filed: March 30, 2020
    Date of Patent: August 24, 2021
    Assignee: Microsoft Technology Licensing, LLC
    Inventors: Yawei Yin, Jamie Gaudette, Lihua Yuan
  • Patent number: 11093215
    Abstract: Photonic processors are described. The photonic processors described herein are configured to perform matrix-matrix (e.g., matrix-vector) multiplication. Some embodiments relate to photonic processors arranged according to a dual-rail architecture, in which numeric values are encoded in the difference between a pair optical signals (e.g., in the difference between the powers of the optical signals). Relative to other architectures, these photonic processors exhibit increased immunity to noise. Some embodiments relate to photonic processors including modulatable detector-based multipliers. Modulatable detectors are detectors designed so that the photocurrent can be modulated according to an electrical control signal. Photonic processors designed using modulatable detector-based multipliers are significantly more compact than other types of photonic processors.
    Type: Grant
    Filed: November 20, 2020
    Date of Patent: August 17, 2021
    Assignee: Lightmatter, Inc.
    Inventors: Nicholas C. Harris, Darius Bunandar, Michael Gould, Carl Ramey, Shashank Gupta, Carlos Dorta-Quinones
  • Patent number: 11075694
    Abstract: A network or system in which a hub or primary node may communicate with a plurality of leaf or secondary nodes. The hub node may operate or have a capacity greater than that of the leaf nodes. Accordingly, relatively inexpensive leaf nodes may be deployed to receive data carrying optical signals from, and supply data carrying optical signals to, the hub node. One or more connections may couple each leaf node to the hub node, whereby each connection may include one or more spans or segments of optical fibers, optical amplifiers, optical splitters/combiners, and optical add/drop multiplexer, for example. Optical subcarriers may be transmitted over such connections, each carrying a data stream. The subcarriers may be generated by a combination of a laser and a modulator, such that multiple lasers and modulators are not required, and costs may be reduced.
    Type: Grant
    Filed: September 22, 2019
    Date of Patent: July 27, 2021
    Assignee: Infinera Corporation
    Inventors: Jeffrey T. Rahn, Kuang-Tsan Wu, Steven J. Hand, David F. Welch
  • Patent number: 11057117
    Abstract: An apparatus is described which uses directly modulated InGaN Light-Emitting Diodes (LEDs) or InGaN lasers as the transmitters for an underwater data-communication device. The receiver uses automatic gain control to facilitate performance of the apparatus over a wide-range of distances and water turbidities.
    Type: Grant
    Filed: August 13, 2020
    Date of Patent: July 6, 2021
    Assignee: Magseis FF LLC
    Inventor: Philip Lacovara
  • Patent number: 11028688
    Abstract: To optimize the efficiency and reliability of downhole data transmissions, an optical splash communication system may be utilized. A downhole tool may include an optical splash communication system that comprises multiple electrical elements where the electrical elements communicate with each other by transmitting and receiving via free space an optical splash signal through an inner space of the downhole tool. The electrical elements may comprise or be coupled to a light source and a detector. Multiple optical splash communication systems may be deployed in multiple downhole tools such that each downhole tool may communicate with another downhole tool via an opening, for example, a transparent sealed window, between the downhole tools. The opening is sufficient to permit transmissions to occur even when the downhole tools are rotated independently of each other.
    Type: Grant
    Filed: July 11, 2016
    Date of Patent: June 8, 2021
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Casey Giron, Wolfgang Hartmut Nitsche, John Laureto Maida
  • Patent number: 10992384
    Abstract: A method of processing a visible light communication (VLC) signal using a single-photon avalanche diode (SPAD) includes detecting photons of a VLC signal at a SPAD detector, counting the photons detected by the SPAD detector to generate a combined VLC signal comprising a data signal and an ambient signal, extracting the ambient signal from the combined VLC signal, subtracting the ambient signal from the combined VLC signal to generate the data signal, and outputting the data signal as a bitstream.
    Type: Grant
    Filed: December 30, 2019
    Date of Patent: April 27, 2021
    Assignee: STMICROELECTRONICS (RESEARCH & DEVELOPMENT) LIMITED
    Inventors: Ellen Couper, Neale Dutton, Alexios Alexandropoulos
  • Patent number: 10992391
    Abstract: Modulated entangled photon pairs are used to transmit data between a sender and receiver subsystem. The sender subsystem comprises at least one data input, a modulator to modulate the photons, a photon combiner and a transmitter coupler to direct the modulated entangled photon pairs towards a receiver. The receiver subsystem comprises a receiver coupler, a photon de-combiner to direct the photons to polarization analyzers to transmit photons of a specified polarization to detectors, and a processor to record the information transmitted by the detectors. The sender subsystem transmits information to the receiver subsystem through the modulation of the entangled photon state. The present system and method is quantum which provides advantages over classical and optical communications. These advantages include using less power to transmit information, and allowing transmission through and around obstructions and adverse environments.
    Type: Grant
    Filed: March 25, 2020
    Date of Patent: April 27, 2021
    Assignee: The United States of Americas as represented by the Secretary of the Army
    Inventors: Ronald E. Meyers, Keith S. Deacon
  • Patent number: 10958342
    Abstract: A method and system for identifying and mitigating interference caused by a rogue transmission source in an Optical Camera Communication (OCC) network is disclosed. The method includes receiving information from a plurality of transmission sources. Each of the plurality of transmission sources is within a capture area of a camera. Each of the plurality of transmission sources comprises a set of light sources configured to display one of a plurality of color codes. The method further includes detecting, through the camera, an interference between a serving transmission source associated with the camera and a non-serving transmission source. The serving transmission source belongs to the plurality of transmission sources. The method further includes establishing the non-serving transmission source as the rogue transmission source, when the non-serving transmission source is not registered with a master coordinator within the OCC network.
    Type: Grant
    Filed: March 31, 2020
    Date of Patent: March 23, 2021
    Assignee: Wipro Limited
    Inventors: Subhas Chandra Mondal, Shailesh Prabhu
  • Patent number: 10958411
    Abstract: Techniques to operate circuitry in an integrated circuit are provided. The circuitry may include rate detection circuitry, receiver circuitry, and configuration circuitry. The receiver circuitry may receive a data stream with an arbitrary data rate. The rate detection circuitry may receive a reference clock signal that is associated with the received data stream. The rate detection circuitry determines the frequency of the reference clock signal such that an appropriate clock signal may be generated for the receiver circuitry. The receiver clock signal may be generated by clock generation circuitry that is coupled to the rate detection circuitry. The configuration circuitry may accordingly configure the receiver circuitry based at least on the determined frequency of the reference clock signal so that the receiver circuitry may operate at the arbitrary data rate.
    Type: Grant
    Filed: April 6, 2020
    Date of Patent: March 23, 2021
    Assignee: Altera Corporation
    Inventors: Boon Hong Oh, Chee Seng Tan, Chau Perng Chin
  • Patent number: 10938485
    Abstract: Disclosed in some examples are methods, systems, optical devices, and machine readable mediums for utilizing uncertainty ranges along with ECC in power level modulation schemes. Photon counts within the uncertainty ranges are not demultiplexed and the data is recovered later by the ECC algorithm without retransmissions. This improves performance by reducing error rate by changing demultiplexing behavior to take advantage of characteristics in the ECC algorithms.
    Type: Grant
    Filed: April 18, 2019
    Date of Patent: March 2, 2021
    Assignee: Microsoft Technology Licensing, LLC
    Inventor: Amer Aref Hassan
  • Patent number: 10902338
    Abstract: The disclosure describes aspects of using multiple species in trapped-ion nodes for quantum networking. In an aspect, a quantum networking node is described that includes multiple memory qubits, each memory qubit being based on a 171Yb+ atomic ion, and one or more communication qubits, each communication qubit being based on a 138Ba+ atomic ion. The memory and communication qubits are part of a lattice in an atomic ion trap. In another aspect, a quantum computing system having a modular optical architecture is described that includes multiple quantum networking nodes, each quantum networking node including multiple memory qubits (e.g., based on a 171Yb+ atomic ion) and one or more communication qubits (e.g., based on a 138Ba+ atomic ion). The memory and communication qubits are part of a lattice in an atomic ion trap. The system further includes a photonic entangler coupled to each of the multiple quantum networking nodes.
    Type: Grant
    Filed: November 6, 2018
    Date of Patent: January 26, 2021
    Assignee: UNIVERSITY OF MARYLAND
    Inventors: Christopher Monroe, Martin Lichtman, Ismail Volkan Inlek, Clayton Crocker, Ksenia Sosnova
  • Patent number: 10897314
    Abstract: In order to suppress any reduction in the reception performance of an optical transceiver, the optical transceiver includes a light source, an optical splitter that splits the output of the light source into a first split light and a second split light, an optical modulation unit that modulates the first split light, a coherent receiver that causes the inputted received light to interfere with the second split light, and a first control unit that controls the split ratio of the optical splitter on the basis of the reception characteristic of the received light received by the coherent receiver.
    Type: Grant
    Filed: February 28, 2018
    Date of Patent: January 19, 2021
    Assignee: NEC CORPORATION
    Inventor: Yuta Goebuchi
  • Patent number: 10841005
    Abstract: The present invention is directed to communication systems and methods. According to an embodiment, a receiving optical transceiver determines signal quality for signals received from a transmitting optical transceiver. Information related to the signal quality is embedded into back-channel data and sent to the transmitting optical transceiver. The transmitting optical transceiver detects the presence of the back-channel data and adjusts one or more of its operating parameters based on the back-channel data. There are other embodiments as well.
    Type: Grant
    Filed: June 21, 2019
    Date of Patent: November 17, 2020
    Assignee: INPHI CORPORATION
    Inventors: Todd Rope, Radhakrishnan L. Nagarajan
  • Patent number: 10651627
    Abstract: Methods, systems, and apparatus, including an optical receiver including an optical source, including a substrate; a laser provided on the substrate, the laser having first and second sides and outputting first light from the first side and second light from the second side, the first light output from the first side of the laser has a first power and the second light output from the second side has a second power; and a first modulator that receives the first light and a second modulator that receives the second light, such that the power of the first light at an input of the first modulator is substantially equal to the power of the second light at an input of the second modulator.
    Type: Grant
    Filed: January 4, 2017
    Date of Patent: May 12, 2020
    Assignee: Infinera Corporaton
    Inventors: Peter W. Evans, Jeffrey T. Rahn, Vikrant Lal, Miguel Iglesias Olmedo, Amir Hosseini, Parmijit Samra, Scott Corzine, Ryan W. Going
  • Patent number: 10396903
    Abstract: An improved scheme for sending classical digital data over a quantum channel is presented using path entanglement. The protocol is can detect digital data by the measurement or non-measurement of one entangled channel to signal to the remote station. The remote station is able to resolve the distant measurement by use of an interferometer. No measurement and the entangled state imply an interference effect at the remote station, whereas measurement results in a mixed state and no interference. A disproof of the “No-communication Theorem” is presented. The method applies to both matter and light waves.
    Type: Grant
    Filed: May 27, 2016
    Date of Patent: August 27, 2019
    Inventor: Remi Oseri Cornwall
  • Patent number: 10382125
    Abstract: The present invention is directed to communication systems and methods. According to an embodiment, a receiving optical transceiver determines signal quality for signals received from a transmitting optical transceiver. Information related to the signal quality is embedded into back-channel data and sent to the transmitting optical transceiver. The transmitting optical transceiver detects the presence of the back-channel data and adjusts one or more of its operating parameters based on the back-channel data. There are other embodiments as well.
    Type: Grant
    Filed: January 20, 2017
    Date of Patent: August 13, 2019
    Assignee: INPHI CORPORATION
    Inventors: Todd Rope, Radhakrishnan L. Nagarajan
  • Patent number: 10284292
    Abstract: In one embodiment, a distributed antenna system comprises: at least one master unit; at least one remote antenna unit communicatively coupled via a switch to the master unit by a primary cable and a secondary cable both coupled to the switch, the remote antenna unit comprising a compensating link check module that outputs a control signal to the switch, wherein the switch selects between the primary and secondary cable in response to the control signal; wherein the compensating link check module controls the switch to momentarily select the secondary cable to perform a link check during which the remote unit measures a quality metric of a downlink signal received via the secondary cable; and upon initiation of the link check, the compensating link check module adjusts an attenuation of the downlink signal received on the secondary cable by loading calibration settings for the secondary cable into a compensation attenuator.
    Type: Grant
    Filed: February 26, 2018
    Date of Patent: May 7, 2019
    Assignee: Andrew Wireless Systems GmbH
    Inventors: Jaroslav Hoffmann, Peter Starek
  • Patent number: 10272930
    Abstract: An axle-counting method for railbound vehicles includes the following method steps: coupling light into at least one sensor fiber, wherein the sensor fiber includes at least one fiber Bragg grating mounted on a rail, wherein each fiber Bragg grating has a reflection spectrum having a reflection peak which is at a Bragg wavelength and has a full width at half maximum; generating a difference signal from two shear stress signals through detection and filtering the temporal intensity course of the light power reflected by two Fiber Bragg gratings which are arranged at a separation from one another; and generating a wheel signal if the difference signal exceeds a predetermined shear stress difference limiting value.
    Type: Grant
    Filed: September 19, 2017
    Date of Patent: April 30, 2019
    Inventors: Kassen Oldewurtel, Rainer Klemm, Mathias Mueller
  • Patent number: 10244607
    Abstract: A daylight harvesting light fixture has a housing defining a light aperture, a light emitting diode (LED) in the housing for providing illumination through the aperture, a power supply for supplying drive current to the LED; a photosensor for sensing ambient illumination through the housing aperture, and a control circuit programmed and connected for a) turning off current to the LED for a dark interval imperceptible to the human eye; b) deriving an ambient illumination level signal based on the photosensor output while the LED is turned off; c) calculating an LED light output complementary to measured ambient illumination to achieve a target ambient illumination; and d) restoring drive current to the LED at a level adjusted to produce the calculated complementary LED light output. This sequence may be repeated periodically to maintain a target ambient illumination.
    Type: Grant
    Filed: December 22, 2017
    Date of Patent: March 26, 2019
    Assignee: DMF Inc.
    Inventor: Oren Kashani
  • Patent number: 10193625
    Abstract: A system with which any abnormality can be easily found is provided. A system includes: a first modulator that generates a control signal and modulates an input signal in accordance with the generated control signal, to control luminance of a first light source that emits light according to the modulated input signal, the first modulator outputting the control signal; a second modulator that acquires the control signal output from the first modulator and modulates an input signal in accordance with the control signal, to control luminance of a second light source that emits light according to the modulated input signal, the second modulator outputting the control signal. The first modulator generates, as a light ID signal, a control signal for transmitting a visible light signal by luminance variations of the first light source, and acquires a light information signal being the control signal output from the second modulator.
    Type: Grant
    Filed: September 7, 2017
    Date of Patent: January 29, 2019
    Assignee: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
    Inventors: Toshiyuki Maeda, Masanori Oshimi, Hiroyuki Oku
  • Patent number: 10185090
    Abstract: Devices and methods are described for selecting a level of entanglement between two nondegenerate photons. The method may include receiving two non degenerate photons through a single input port of a directional photonic coupler; adjusting one of a first-order coupler dispersion M or a power splitting ratio ?(?00) of the directional optical coupler to select a ??; and, emitting the photons from corresponding output ports of the directional optical coupler, wherein the emitted photons have a spectral entanglement corresponding to the selected ??.
    Type: Grant
    Filed: June 27, 2017
    Date of Patent: January 22, 2019
    Assignee: THE GOVERNING COUNCIL OF THE UNIVERSITY OF TORONTO
    Inventors: Ryan Phillip Marchildon, Amr Saher Helmy
  • Patent number: 10171162
    Abstract: An apparatus and method for measuring frequency response characteristics of an optical transmitter and an optical receiver where the apparatus includes: a generating unit configured to generate a driving signal for driving the modulator of the optical transmitter, which comprises at least two frequencies; and a calculating unit configured to respectively calculate the frequency response characteristics of the optical transmitter and the optical receiver according to output signal components in output signals of the optical receiver corresponding to at least two detection signal components of identical amplitudes and different frequencies in detection signals. The frequency response characteristics of the optical transmitter and the optical receiver may be obtained, the amplitude responses and phase responses in the frequency response characteristics may be respectively obtained, and the measurement results are accurate and reliable.
    Type: Grant
    Filed: March 31, 2017
    Date of Patent: January 1, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Cheng Ju, Liang Dou, Zhenning Tao
  • Patent number: 10168417
    Abstract: A system includes a control system. The control system includes a processor configured to receive a first signal from a light source within an industrial facility. The first signal includes a unique identification code configured to indicate at least a partial identity of a human resource within the industrial facility. The processor is configured to determine a proximity of the human resource with respect to the light source based at least in part on a received signal strength indicator (RSSI) of the first signal, and to generate an indication of a location of the human resource within the industrial facility based on the determined proximity of the human resource to the light source.
    Type: Grant
    Filed: August 10, 2016
    Date of Patent: January 1, 2019
    Assignee: GENERAL ELECTRIC COMPANY
    Inventors: Selaka Bandara Bulumulla, Michael James Hartman, S. M. Shajedul Hasan, Steven William Wik
  • Patent number: 10164739
    Abstract: Embodiments of the invention provide an optical transmitter configured to transmit a data sequence over at least two spatial propagation modes through an optical transmission channel in a multi-mode optical fiber transmission system, the transmission system being associated with a predefined value of a mode-dependent loss, wherein the optical transmitter comprises: a forward error correcting code encoder (22) configured to encode said data sequence into a codeword vector by applying at least one error correcting code; a modulator (23) configured to determine a set of modulated symbols by applying a modulation scheme to said codeword vector; and a Space-Time encoder (24) configured to determine a codeword matrix by applying a Space-Time code to said set of modulated symbols.
    Type: Grant
    Filed: June 19, 2017
    Date of Patent: December 25, 2018
    Assignee: INSTITUT MINES-TELECOM
    Inventors: Ghaya Rekaya Ben-Othman, Yves Jaouen, El-Mehdi Amhoud
  • Patent number: 10153617
    Abstract: In the field of optical networks, a laser, a laser modulation method and a laser combination system are disclosed. The laser includes a gain medium, a resonant cavity, and a second microring resonator. The resonant cavity includes a first cavity mirror and a second cavity mirror. The first cavity mirror is located at one port of the gain medium, the second cavity mirror is located at another port of the gain medium, and the second cavity mirror includes a splitter, a first microring resonator, and a reflecting grating.
    Type: Grant
    Filed: August 3, 2017
    Date of Patent: December 11, 2018
    Assignee: Huawei Technologies Co., Ltd
    Inventor: Xiaolu Song
  • Patent number: 10153796
    Abstract: A system and method for processing photoplethysmography (PPG) signals in a vehicle. The system and method include receiving a PPG waveform signal from an optical sensor. The system and method also include processing a PPG measurement signal based on the PPG waveform signal. The system and method additionally include receiving a noise waveform signal from at least one of: a seat assembly sensor, a vehicle sensor, and a vehicle system. Additionally, the system and method include processing a motion artifacts measurement signal based on the noise waveform signal. The system and method further include processing a refined PPG signal to suppress the motion artifacts measurement signal from the PPG measurement signal.
    Type: Grant
    Filed: April 27, 2015
    Date of Patent: December 11, 2018
    Assignee: Honda Motor Co., Ltd.
    Inventors: Kin C. Fung, Timothy J. Dick, Dhanashree Palande
  • Patent number: 10149019
    Abstract: A system for providing data communication over a MoCA (Multimedia over Coaxial Alliance) network in a construction complex, the system comprising a coaxial network; a network management device connectable to an external data channel, the network management device comprising a connector structured to be connected to the coaxial network; and a control unit having a first MoCA chip, wherein the control unit is configured to establish an access function, creating a control channel over the coaxial network to one or more MoCA end devices; and at least one MoCA end device connected to the coaxial network, wherein the at least one MoCA end device has a second MoCA chip and a network access unit connected to a bus on the second MoCA chip.
    Type: Grant
    Filed: November 2, 2016
    Date of Patent: December 4, 2018
    Assignee: INCOAX NETWORKS AB
    Inventor: Carl Karlsson
  • Patent number: 10135532
    Abstract: An optical receiver (10) comprising: an input (12) arranged to receive a subcarrier multiplexing, SCM, optical signal (14) comprising an optical carrier and an optical subcarrier, each having a respective optical power; a carrier suppression element, CSE, (16) arranged to receive the SCM optical signal and having a rejection band that is tunable in frequency to partially suppress the optical carrier by a variable amount; an optical amplifier (18) having a variable gain and arranged to receive the SCM optical signal from the CSE and amplify the optical carrier and the optical subcarrier; a photoreceiver (20) arranged to receive the SCM optical signal from the amplifier; and a controller (24) arranged to cause frequency tuning of the rejection band and variation of the gain of the optical amplifier to adjust a ratio of the optical power of the optical carrier at the photoreceiver to the optical power of the optical subcarrier at the photoreceiver based on an indication of performance of the SCM optical signal.
    Type: Grant
    Filed: April 30, 2015
    Date of Patent: November 20, 2018
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Filippo Ponzini, Boris Dortschy, Luca Giorgi, Patryk Urban
  • Patent number: 10120127
    Abstract: An apparatus includes an input radio frequency waveguide. The apparatus includes a radio-frequency-to-optical-radio-frequency-impedance-matching interface communicating with the input radio frequency waveguide. The apparatus includes a plurality of optical modulators communicating with the radio-frequency-to-optical-radio-frequency-impedance-matching interface. The apparatus includes a plurality of respective optical waveguides communicating with the plurality of optical modulators. The plurality of respective optical waveguides in operation includes a plurality of respective optical waveguide fields. The input radio frequency waveguide in operation includes an input radio frequency waveguide field. The input radio frequency waveguide field interacts with the plurality of respective optical waveguide fields to convert an input radio frequency signal into a plurality of optical signals.
    Type: Grant
    Filed: October 2, 2017
    Date of Patent: November 6, 2018
    Assignee: The United States of America, as represented by the Secretary of the Navy
    Inventors: Keith J. Williams, Jason D. McKinney
  • Patent number: 10123178
    Abstract: Determining the physical location of wirelessly connected devices within a network can provide a number of security benefits. However, manually determining and configuring the physical location of each device within a system can be burdensome. To ease this burden, devices within a network are equipped with a location detection sensor that is capable of automatically determining a device's location in relation to other devices within the network. A location detection sensor (“sensor”) may include a light source, a light direction sensor, a rangefinder, and a radio or wireless network interface. Two location detection sensors can perform a location detection process to determine their relative locations to each other, such as the distance between them. As more sensors are added to a network, a sensor management system uses the relative locations determined by the sensors to map the sensors to a physical space layout.
    Type: Grant
    Filed: August 30, 2016
    Date of Patent: November 6, 2018
    Assignee: CA, Inc.
    Inventors: Serguei Mankovskii, Steven L. Greenspan, Maria Cecilia Velez Rojas
  • Patent number: 10090889
    Abstract: RFID (radio frequency identification) systems are provided in which tag and interrogator devices implement a hybrid framework for signaling including an optical transmitter/receiver system and an RF transmitter/receiver system. For instance, an RFID tag device includes: optical receiver circuitry configured to receive an optical signal having an embedded clock signal from an interrogator device, and convert the optical signal into an electrical signal comprising the embedded clock signal; clock extraction circuitry configured to extract the embedded clock signal from the electrical signal, and output the extracted clock signal as a clock signal for controlling clocking functions of the tag device; voltage regulator circuitry configured to generate a regulated supply voltage from the electrical signal, wherein the regulated supply voltage is utilized as a bias voltage for components of the tag device; and data transmitter circuitry configured to wirelessly transmit tag data to the interrogator device.
    Type: Grant
    Filed: June 7, 2017
    Date of Patent: October 2, 2018
    Assignee: International Business Machines Corporation
    Inventors: Daniel J. Friedman, Duixian Liu, Mihai A. Sanduleanu
  • Patent number: 10075234
    Abstract: Techniques are disclosed for emitting position information from luminaires. Luminaire position information may be emitted via a light-based communication (LCom) signal that comprises data including the position information. The data may include relative and/or absolute position information for the luminaire and may indicate the physical location of the luminaire. Relative position information for the luminaire may include coordinates relative to a point of origin within the environment. Absolute position information for the luminaire may include global coordinates for the luminaire. In some cases, the absolute position information for a luminaire may be calculated using position information for the luminaire relative to a point of origin and the absolute position of the point of origin. The data may also include an environment identifier, which may indicate a map to use for the interpretation of position information for the luminaire. The techniques can be used for both stationary and mobile luminaires.
    Type: Grant
    Filed: December 16, 2014
    Date of Patent: September 11, 2018
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: Christian Breuer, Anant Aggarwal, Bernhard Siessegger
  • Patent number: 10063320
    Abstract: Apparatuses and methods for implementing a photonic radio front end are provided. An example apparatus may include a photonic comb filter configured to generate a photonic pulse train at a plurality of carrier frequencies, and a photonic upconverter. The photonic upconverter may be configured to receive outbound data from a data source, and encode and photomix the outbound data onto each of the carrier frequencies within the plurality of carrier frequencies to generate associated upconverted waveforms on each of the carrier frequencies. The apparatus may further comprise a transmit channel selector configured to receive the upconverted waveforms on each of the carrier frequencies, receive a control signal selecting one or more carrier frequencies for transmission of the outbound data, and filter out the upconverted waveforms at unselected carrier frequencies to provide upconverted waveforms at the selected carrier frequencies.
    Type: Grant
    Filed: January 17, 2017
    Date of Patent: August 28, 2018
    Assignee: The Johns Hopkins University
    Inventors: Thomas R. Clark, Jr., Jay H. Song, Timothy P. McKenna, Keith G. Petrillo, Jeffrey A. Nanzer, Stuart A. Jackson, Olukayode K. Okusaga
  • Patent number: 10027415
    Abstract: An apparatus for transmitting a control signal in a radio-over-fiber (RoF)-based mobile fronthaul includes: a data channel transmitter configured to generate a data signal at a preassigned frequency or wavelength; a control channel transmitter configured to generate a control signal at a designated frequency or wavelength that is shared with other apparatuses; and a combiner configured to combine the data signal with the control signal.
    Type: Grant
    Filed: March 24, 2016
    Date of Patent: July 17, 2018
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Seung Hyun Cho, Jong Hyun Lee, Hwan Seok Chung, Chan Gyo Han
  • Patent number: 10020887
    Abstract: A wireless communication system includes a baseband processing device configured to transmit a data signal via an optical transmission line, and a wireless device configured to receive the data signal via the optical transmission line and carry out wireless transmission of an output signal obtained by amplifying the data signal, wherein the wireless device is configured to amplify the data signal to generate the output signal, generate a feedback signal according to the output signal, and transmit the feedback signal to the baseband processing device via the optical transmission line, and wherein the baseband processing device is configured to acquire the feedback signal from the wireless device, and execute first processing of multiplying the data signal by a distortion compensation coefficient corresponding to an inverse characteristic of distortion in the radio frequency circuit based on the feedback signal.
    Type: Grant
    Filed: January 27, 2017
    Date of Patent: July 10, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Daisuke Masunaga, Akira Toyomane, Katsutoshi Usami, Masaaki Okada
  • Patent number: 10012733
    Abstract: An apparatus for determining the location and state of an object in an environment is disclosed. Three or more light-emitting beacons are located in the environment, and each beacon transmits a light pattern that contains information needed to identify the beacon. An optical receiver is attached to the object whose location needs to be determined. The optical receiver comprising one or more cameras images the beacons, and identifies the apparent direction from which the beacon is coming based on the pixel or pixels illuminated by the beacon. The optical receiver also decodes the light pattern transmitted by each beacon to identify it. Finally, based on knowledge of the locations of the beacons in the environment and based on the apparent directions from which the beacons appear to be coming, the optical receiver determines its location, and thus the location of the object.
    Type: Grant
    Filed: June 7, 2016
    Date of Patent: July 3, 2018
    Inventors: Geoffrey Louis Barrows, Gregory Brill, Craig William Neely
  • Patent number: 10002441
    Abstract: An image processing apparatus includes an imaging unit that divides an image of a subject into blocks, a quadric-surface fitting unit that calculates a distance from a reference position to the subject that corresponds to each block, a weight calculating unit that calculates a weight of each block according to the distance, and a barycenter calculating unit that corrects information about a size of the subject projected in each block based on the weight, and calculates barycentric coordinates based on the corrected information about the size of the subject.
    Type: Grant
    Filed: October 26, 2016
    Date of Patent: June 19, 2018
    Assignee: FUJITSU LIMITED
    Inventor: Takahiro Aoki
  • Patent number: 9979484
    Abstract: A system and method for channelization of a wideband radio frequency signal into multiple narrowband channels includes obtaining, a dual-banded optical signal, where the dual-banded signal is a translated wideband radio frequency signal, and where the dual-banded signal includes a signal and an idler. The method also includes modifying, by the spectral phase mask, the spectral phases of at least one of the signal or the idler, where the modifying produces a spectral phase modulated output comprising at least one of a spectrally-modulated signal or a spectrally modulated idler. The method includes outputting, by the spectral phase mask, the spectral phase modulated output to an optical phase sensitive amplifier. The method includes receiving, by the optical phase sensitive amplifier, the spectral phase modulated output, and either amplifying or de-amplifying, by the optical phase sensitive amplifier, each component of the spectrally modulated output.
    Type: Grant
    Filed: February 1, 2017
    Date of Patent: May 22, 2018
    Assignee: Vencore Labs, Inc.
    Inventors: James M. Dailey, Anjali Agarwal, Paul Toliver, Tom Banwell
  • Patent number: 9935719
    Abstract: An optical receiver receives a photocurrent from a photosensor and uses a transimpedance element to convert the photocurrent into an input signal. Next, an amplifier amplifies the input signal to produce an amplified input signal. At the same time, a clock-recovery circuit generates a clock signal, which is used to clock the amplified input signal to produce a receiver output. During an initial-calibration operation, the clock-recovery circuit phase-aligns a locally generated reference signal with transitions in the amplified input voltage signal to produce the clock signal by: feeding the reference signal through a delay-locked loop to produce a set of equally spaced phases; using the set of equally spaced phases to sample a preamble in the amplified input voltage signal to detect a crossing point; choosing a corresponding phase from the set of equally spaced phases based on the crossing point; and using the chosen phase to produce the clock signal.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: April 3, 2018
    Assignee: Oracle International Corporation
    Inventors: Saman Saeedi, Frankie Y. Liu, Suwen Yang
  • Patent number: 9935718
    Abstract: An optical receiver receives a photocurrent from a photosensor and uses a transimpedance element to convert the photocurrent into an input voltage signal. An amplifier then amplifies the input voltage signal to produce a receiver output. During this process, a reference-voltage-generation circuit generates a reference voltage for the amplifier. This reference-voltage-generation circuit includes a data-detection circuit that detects data on the input voltage signal, and an adjustable low-pass filter, which filters the input voltage signal to produce the reference voltage. During a faster operating mode, which occurs when the data-detection circuit does not detect data on the input voltage signal, the filter has a cutoff frequency f1. During a slower operating mode, which starts a bias-delay time tBD after the data-detection circuit detects data on the input voltage signal, and lasts until the data-detection circuit no longer detects data, the filter has a lower cutoff frequency f2.
    Type: Grant
    Filed: December 5, 2016
    Date of Patent: April 3, 2018
    Assignee: Oracle International Corporation
    Inventors: Saman Saeedi, Frankie Y. Liu, Suwen Yang
  • Patent number: 9916266
    Abstract: Re-initialization of a link can take place without termination of the link, where the link includes, a transmitter and a receiver are to be coupled to each lane in the number of lanes, and re-initialization of the link is to include transmission of a pre-defined sequence on each of the lanes.
    Type: Grant
    Filed: August 15, 2016
    Date of Patent: March 13, 2018
    Assignee: Intel Corporation
    Inventors: Venkatraman Iyer, Darren S. Jue, Robert G. Blankenship, Fulvio Spagna, Ashish Gupta