Patents Examined by Danny Leung
  • Patent number: 9939651
    Abstract: An example beam splitting apparatus is assembled from multiple prisms that are assembled together along respective mating surfaces to form a single monolithic optical device. The beam splitting apparatus includes optical features, such as dichroic and reflective surfaces, that define optical paths for light that enters the beam splitting apparatus. The optical features allow photons in the light to be directed along different optical paths based on their wavelengths. The optical features in the beam splitting apparatus are provided by coatings, films, and/or surface treatments applied to any of the faces of the prisms. In particular, coatings, films, and/or surface treatments are applied to the mating surfaces of the prisms so that the optical features are internal to the assembled monolithic optical device. The beam splitting apparatus may be implemented in a communication terminal that exchanges data modulated light according to frequency-division duplex communications.
    Type: Grant
    Filed: July 31, 2017
    Date of Patent: April 10, 2018
    Assignee: X Development LLC
    Inventors: Robert Todd Belt, Nam-hyong Kim, Baris Ibrahim Erkmen, Edward Allen Keyes
  • Patent number: 9935720
    Abstract: A system includes a laser configured to generate a tunable optical frequency. The system also includes an optical transmitter to map baseband data to symbols represented in a digital modulation constellation, add a frequency offset to the digital modulation constellation to cause the digital modulation constellation to rotate at a rate equal to the added frequency offset, modulate the optical frequency with the rotating digital modulation constellation, and transmit the resulting modulated optical frequency. The system also includes an optical receiver to receive the transmitted modulated optical frequency and, using the tunable optical frequency, detect the rotating digital modulation constellation conveyed by the received modulated optical frequency.
    Type: Grant
    Filed: July 7, 2017
    Date of Patent: April 3, 2018
    Assignee: Cisco Technology, Inc.
    Inventors: Christopher Fludger, Thomas Duthel, Joerg Leykauf, Karsten Michaelsen
  • Patent number: 9929809
    Abstract: Methods and systems are described for sampling an LCOM message and accurately reconstructing the entire LCOM message using a light receiver (e.g., digital camera) of a typical mobile computing device, such as a smartphone, tablet, or other mobile computing device. These including receiving segments of an LCOM signal from at least two repetitions of the LCOM signal. The location of each segment within the LCOM signal is identified and each segment is stored in a corresponding location in a buffer configured to have a length equal to the LCOM signal. The buffer is a ring buffer, in some embodiments.
    Type: Grant
    Filed: June 29, 2017
    Date of Patent: March 27, 2018
    Assignee: OSRAM SYLVANIA Inc.
    Inventors: Anant Aggarwal, Christian Breuer, Barry Stout
  • Patent number: 9923640
    Abstract: A transmission apparatus including: a waveform shaper that performs spectrum correction on an optical signal converted from an electrical signal encoded by OFDM (Orthogonal Frequency Division Multiplexing); a converter that converts the optical signal on which the waveform shaper has performed the spectrum correction, into the electrical signal; and a nonlinear compensator that compensates for a nonlinear distortion with respect to the electrical signal converted by the converter.
    Type: Grant
    Filed: August 23, 2016
    Date of Patent: March 20, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Ryou Okabe, Tomoo Takahara, Toshiki Tanaka, Masato Nishihara
  • Patent number: 9917650
    Abstract: Photonic integration has primarily sought to exploit optical parallelism through wavelength division multiplexing whilst in many instances “brute-force” time division multiplexing offers benefits through reduced complexity and cost. However, photoreceivers are primarily the same now for operation at 10 Gb/s, 20 Gb/s, 40 Gb/s and above as 20 or 25 years ago and exploit the same optical detection—amplification—logic processing design. However, high speed low cost electronics ca be leveraged in conjunction with optical time sampling and logic to provide a new design paradigm. An incoming XGbs?1 optical data stream is sampled and processed by N photodetectors each operating at (X/N)Gbs?1 rather than the current direct XGbs?1 front-end of the prior art. Flexibility for the designer in establishing N within optical layer constraints, electronics capabilities etc.
    Type: Grant
    Filed: August 26, 2016
    Date of Patent: March 13, 2018
    Assignees: TRANSFERT PLUS, SOCIÉTÉ EN COMMANDITE, THE ROYAL INSTITUTION FOR THE ADVANCEMENT OF LEARNING/ MCGILL UNIVERSITY
    Inventors: Odile Liboiron-Ladouceur, Md. Shafiqul Hai, Michael Menard
  • Patent number: 9906313
    Abstract: An optically powered media conversion device for performing optical to electrical conversion is disclosed. The conversion device includes at least one optical coupler for receiving at least one optical signal comprising at least one wavelength, wherein the at least one optical coupler extracts energy from the at least one optical signal, and at least one detector for extracting data from the at least one optical signal and converting the optical signal to an electrical signal using a photovoltaic process. The conversion device further includes a transmitter for converting an electrical signal to an optical signal and transmitting the optical signal to a first device.
    Type: Grant
    Filed: July 25, 2016
    Date of Patent: February 27, 2018
    Assignee: CommScope Technologies LLC
    Inventor: Joseph C. Coffey
  • Patent number: 9906301
    Abstract: Provided herein is a single module bi-directional optical transmitting and receiving system including a transmitter transmitting an optical signal by converting a down-signal, and obtaining an up-signal by converting y the optical signal that is received, and a receiver transmitting the optical signal by converting the up-signal, and obtaining the down-signal by converting the optical signal that is received, wherein the transmitter and the receiver include a single optical transmitting module including a monitor receiving module, transmit the optical signal through the single optical transmitting module, and receive the optical signal through the monitor receiving module.
    Type: Grant
    Filed: July 13, 2016
    Date of Patent: February 27, 2018
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Soo Yong Jung, Jong Jin Lee, Hyun Seo Kang, Sei Hyoung Lee, Hee Seung Kim
  • Patent number: 9906308
    Abstract: Methods and systems for decoding symbols transmitted over an optical channel having a cross-polarization modulation (XPolM) impairment, wherein an optical signal is polarized to encode the symbols on an x-polarization and an y-polarization before transmitted. The method including receiving the optical signal transmitted over the optical channel. Sampling the optical signal to produce a sequence of digital samples, wherein each digital sample includes a measurement of each polarization of the optical signal at an instance of time. Selecting a subset of the sequence of digital samples that includes a digital sample and neighboring digital samples on the sequence. Repeating the selecting and the determining for each digital sample remaining in the sequence of digital samples to produce a sequence of cross-talk coefficients; and decoding some of the symbols from the sequence of digital samples using cross-talk models with corresponding cross-talk coefficients, wherein method steps are performed using a processor.
    Type: Grant
    Filed: August 23, 2016
    Date of Patent: February 27, 2018
    Assignee: Mitsubishi Electric Research Laboratories, Inc.
    Inventors: Milutin Pajovic, Kieran Parsons, David Millar, Toshiaki Koike-Akino, Keisuke Kojima
  • Patent number: 9893834
    Abstract: A branching unit for an optical system includes an optical add-drop multiplexer, which includes first and second filters. The first filter is configured to filter a first band of wavelengths of a communication spectrum for a first communication segment. The second filter is configured to filter a second band of wavelengths of the communication spectrum for a second communication segment. The second band of wavelengths overlaps the first band of wavelengths in an overlap band of wavelengths with no guard band between the first band of wavelengths and the second band of wavelengths. Moreover, the overlap band of wavelengths has a variable size. The first band of wavelengths includes a first fraction of the overlap band of wavelengths for the first communication segment and the second band of wavelengths includes a remaining fraction of the overlap band of wavelengths for the second communication segment.
    Type: Grant
    Filed: December 14, 2016
    Date of Patent: February 13, 2018
    Assignee: Google LLC
    Inventors: Valey Kamalov, Joseph Freeland, Andrew Metcalf
  • Patent number: 9892632
    Abstract: An example technique of configuring a universal remote control device includes receiving a plurality of transmitted infrared signals during a time period; storing the plurality of infrared signals and a time of each of the plurality of infrared signals; detecting a plurality of appliance events during the time period; storing the plurality of appliance events and a time of each of the plurality of appliance events; correlating the plurality of infrared signals with the plurality of appliance events based on the time of each of the plurality of infrared signals and the time of each of the plurality of appliance events; and defining configuration information for a universal remote control device based on the correlating of the plurality of infrared signals with the plurality of appliance events.
    Type: Grant
    Filed: April 18, 2016
    Date of Patent: February 13, 2018
    Assignee: GOOGLE LLC
    Inventor: Honglei Wu
  • Patent number: 9893809
    Abstract: Disclosed herein are an apparatus and method for visible light communication using electrically switchable glass. The apparatus for visible light communication using the electrically switchable glass includes a reception unit for receiving a data signal, a control unit for generating current and voltage corresponding to the data signal and controlling the transmittance of the electrically switchable glass based on the current and the voltage, and a transmission unit for adjusting the brightness of visible light that passes through the glass based on the transmittance and performing visible light communication using the visible light that has passed through the glass.
    Type: Grant
    Filed: April 19, 2016
    Date of Patent: February 13, 2018
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: You-Jin Kim, Dae-Ho Kim, Hyun-Seok Kim, Hyun-Jong Kim, Ji-Hun Jeon, Tae-Gyu Kang
  • Patent number: 9887771
    Abstract: A bandwidth throttling method is provided. The method includes receiving by a receiver from a QD Vcel cannon, a plurality of multi-frequency light pulses via a plurality of channels. The receiver determines that the plurality of multi-frequency light pulses comprises an out of band (OOB) signal transmitted over a first channel of the plurality of channels. The receiver receives from a first laser device of the QD Vcel cannon, a first light pulse of the plurality of multi-frequency light pulses. The first light pulse includes a first frequency for testing a visibility of the first light pulse at the receiver. The receiver determines if the first light pulse is visible at the receiver.
    Type: Grant
    Filed: October 23, 2015
    Date of Patent: February 6, 2018
    Assignee: International Business Machines Corporation
    Inventors: Ricardo A. Golcher Ugalde, Franz F. Liebinger Portela, Meller J. Perez Nunez
  • Patent number: 9883264
    Abstract: A software defined network, in accordance with some examples of the disclosure, may be used to optimizing traffic across a multi-layer inter-exchange for applications like automated private peering by incorporating packet switching along with OTN and/or optical switching into a converged system. Participants in private peering may have ports into the multi-layer inter-exchange, some to the L2 fabric which supports multi-tenant peering and some to the L1 or L0 fabric for higher-performance private peering.
    Type: Grant
    Filed: December 31, 2015
    Date of Patent: January 30, 2018
    Assignee: Infinera Corporation
    Inventors: Chris Liou, Abhinava Shivakumar Sadasivarao, Sharfuddin Syed, Stu Elby, Balaji Balasubramanian, Sri Mohana Satya Srinivas Singamsetty
  • Patent number: 9880351
    Abstract: The present invention relates to optical transmitters, transceivers, and transponders used for transmission of information or data in any form through a physical medium dependent (PMD) network. The speed of such networks depends, in part, on the density of information that can be transmitted through the physical medium. Optical transmitters or transceivers can be used to transmit multiple independent signals simultaneously through the same medium using different directions or axes of polarization, where the difference in the directions or axes of polarization can be used to distinguish the multiple signals at the receiver. In this invention, we use a master laser (l0) to synchronize two slave lasers (l1 and l2) by its x-polarization and y-polarization components of carrier, respectively, so that two slave lasers can be enforced to lock on exactly the same wavelength l0 with perpendicular polarization directions.
    Type: Grant
    Filed: April 16, 2014
    Date of Patent: January 30, 2018
    Assignee: ZTE (USA) Inc.
    Inventors: Hung-Chang Chien, Zhensheng Jia, Jianjun Yu
  • Patent number: 9876582
    Abstract: An integrated multi-channel photonic radio-frequency (RF) receiver system includes a master oscillator including a laser source configured to generate laser light. A local oscillator (LO) path may include an LO generator, an LO modulator, an optical LO filter, and an optical amplifier optically coupled to one another to generate an LO signal. Multiple RF-modulation channels are coupled through an optical switch to a number of channel filters and configured to produce a number of filtered RF-modulated optical signals. An optical combiner may combine the LO signal with each filtered RF-modulated optical signal to generate down-converted optical signals. Each channel of the plurality of RF-modulation channels includes a channel laser coupled to a channel modulator, and the LO generator and channel lasers of the RF-modulation channels are fed by the laser light of the master oscillator.
    Type: Grant
    Filed: August 16, 2016
    Date of Patent: January 23, 2018
    Assignee: LOCKHEED MARTIN CORPORATION
    Inventors: Thomas William Karras, Stephen Voiers Robertson
  • Patent number: 9876694
    Abstract: This application provides an apparatus and method for detecting online failure and a system. The apparatus includes: a reading unit configured to read signal to noise ratios of subcarriers from a receiver of a multicarrier optical communication system according to a predetermined monitoring time interval; a judging unit configured to judge whether there exist a first predetermined number of subcarriers of which the signal to noise ratios are less than a first threshold value; a detecting unit configured to monitor a change of distortion of the system when it is judged yes by the judging unit, and determine a cause of degradation of signal to noise ratios according to the change of distortion of the system; and a reporting unit configured to report degradation of signal to noise ratios and/or the cause of degradation of signal to noise ratios.
    Type: Grant
    Filed: July 12, 2016
    Date of Patent: January 23, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Lei Li, Bo Liu
  • Patent number: 9866369
    Abstract: A beacon includes an infrared emitter configured to emit beacon signals; an infrared-link emitter configured to emit infrared-link signals having a wavelength different from that of the beacon signals; an infrared-link detector configured to detect infrared-link signals; a memory configured to store a delay time; a clock configured to generate a clock cycle signal; and a microcontroller configured to, in response to receiving an infrared-link signal including a signaling code and clock synchronization data from an external beacon: adjust the clock to be synchronized with a clock of the external beacon; store the signaling code in the memory; and when the clock cycle signal generated by the clock indicates that it is a starting time of a clock cycle period, control the infrared emitter to emit a beacon signal including the signaling code with the delay time relative to the starting time of the clock cycle period.
    Type: Grant
    Filed: August 18, 2016
    Date of Patent: January 9, 2018
    Assignee: Cejay Engineering, LLC
    Inventors: Derek Haynes, Guido Albert Lemke, Mark Haynes
  • Patent number: 9866314
    Abstract: Provided is a linear automatic protection switching (APS) apparatus and method that minimizes a data loss in an optical transport network (OTN) system, the apparatus and method that may maintain time synchronization by transmitting/receiving time synchronization signals between APS apparatuses of a working path and a redundant path, and transmitting/receiving time synchronization signals between local and remote APS apparatuses.
    Type: Grant
    Filed: April 18, 2016
    Date of Patent: January 9, 2018
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventor: Seung Woo Lee
  • Patent number: 9860053
    Abstract: Synchronizing SBS suppressing optical phase/frequency modulation of each of a plurality of optical transmitters can be achieved with a plurality of optical transmitters conveying a plurality of optical carriers; and a synchronizer coupled to each of the plurality of optical transmitters to synchronize the SBS suppressing optical phase/frequency modulation of each of the plurality of optical carriers.
    Type: Grant
    Filed: April 15, 2016
    Date of Patent: January 2, 2018
    Assignee: Aurora Networks, Inc.
    Inventors: Brian Ishaug, Sudhesh Mysore
  • Patent number: 9854336
    Abstract: The integrated network element offers an efficient fiber-chip coupling of multiple outputs of a polarization sensitive photonic integrated circuit (PIC) using a programmable mirror co-packaged with the PIC. Efficient fiber-chip coupling requires precise and active alignment of all free-space components. These constraints can be reduced by using a programmable mirror in the form of a liquid crystal on silicon (LCoS) device. The LCoS can be programmed with patterns that offer highly accurate beam-steering and focusing functionality. Imaging optics may be used at the PIC facet to provide some degree of collimation in the free-space optical path to efficiently illuminate the LCoS. By reprogramming the LCoS switching between two outputs/inputs can be obtained at high speed.
    Type: Grant
    Filed: December 31, 2015
    Date of Patent: December 26, 2017
    Assignee: Infinera Corporation
    Inventors: Philipp Claudius Schindler, Jeffrey Rahn, Rene Schmogrow