Patents Examined by Shi K. Li
  • Patent number: 10735129
    Abstract: A bandwidth allocation apparatus and method for providing a low-latency service in an optical network that may guarantee low-latency requirements and improve a network utilization rate by allocating a static bandwidth to an ONU requiring low latency within an allocable bandwidth and by allocating a dynamic bandwidth to an ONU not requiring the low latency within a remaining bandwidth.
    Type: Grant
    Filed: December 4, 2018
    Date of Patent: August 4, 2020
    Inventors: Kyeong Hwan Doo, Kwang Ok Kim, Hwan Seok Chung
  • Patent number: 10727939
    Abstract: This application discloses a communication method, an optical line terminal, and an optical network unit in a passive optical network system. The PON system includes an OLT and at least one ONU, and the method includes: receiving, by the OLT, a first message that is sent by a first ONU in the at least one ONU through a first upstream channel; determining a first round trip time (RTT) of the first ONU based on a receiving moment of the first message; determining a time window based on the first RTT; sending first indication information to the first ONU through a downstream channel, where the first indication information includes the time window; receiving a second message that is sent by the first ONU through a second upstream channel within the time window; and determining a second RTT of the first ONU based on a receiving moment of the second message.
    Type: Grant
    Filed: August 27, 2019
    Date of Patent: July 28, 2020
    Inventors: Jinrong Yin, Dianbo Zhao, Sulin Yang
  • Patent number: 10727950
    Abstract: A method of controlling an optical transmitter comprising a determining step, a dividing step and a determining step. In the determining step, a full range of an optical signal output from a light-generating device is determined by setting an upper and a lower limit thereof by keeping power of a continuous wave (CW) light constant and varying an electrical driving signal, the optical signal having 2n optical levels where n is an integer. In the dividing step, the full range of the optical signal is divided into sub-ranges each between the neighbor optical levels including the upper limit and the lower limit of the full range, the sub-ranges having preset ratios. In the determining step, electrical levels of the electrical driving signal are determined based on a non-linear transfer characteristic of the light-generating device between the electrical driving signal supplied thereto and the optical signal output therefrom.
    Type: Grant
    Filed: November 28, 2018
    Date of Patent: July 28, 2020
    Assignee: Sumitomo Electric Device Innovations, Inc.
    Inventor: Ryouta Teranishi
  • Patent number: 10707956
    Abstract: A network tap comprises a set of optical signal regeneration circuits and a failover circuit. The set of optical signal regeneration circuits is configured to convert an input optical signal from one network device to an electromagnetic signal and generate output optical signals for another network device and for a monitoring device from the electromagnetic signal. The failover circuit is configured to provide the input optical signal to the set of optical signal generation circuits in a normal mode and provide the input optical signal to the other network device in a failure mode.
    Type: Grant
    Filed: July 17, 2019
    Date of Patent: July 7, 2020
    Assignee: Profitap HQ B.V.
    Inventor: Laurent Schirck
  • Patent number: 10700806
    Abstract: An article may include an optical transceiver package, which may include a photonics component mounted in the optical transceiver package. The photonics component may generate heat in an operational state. The optical transceiver package may include a sealed thermal chamber that maintains the photonics component between a lower predetermined working temperature and a higher predetermined working temperature. The sealed thermal chamber may include a material that exhibits a first thermal conductivity below a lower predetermined threshold temperature and a second thermal conductivity higher than the first thermal conductivity above an upper predetermined threshold temperature. A method may include retaining the generated heat to raise the photonics component above a lower predetermined working temperature, and conducting the generated heat away from the optical transceiver package to lower the photonics component below an upper predetermined working temperature.
    Type: Grant
    Filed: April 4, 2019
    Date of Patent: June 30, 2020
    Assignee: Juniper Networks, Inc.
    Inventors: Theodore John Schmidt, Roberto Marcoccia
  • Patent number: 10686531
    Abstract: Phase imbalance between in-phase (I) and quadrature (Q) components of an optical communications signal causes signal degradation that can result in degraded bit-error rate performance, increased power requirements, and reduced transmission distance. The signal degradation can be expressed as a reduced signal to noise and interference ratio. The disclosed system and techniques monitor the phase imbalance between the I and Q channels and provides for adjustment of the phase of one or more of the I and Q channels to improve overall performance.
    Type: Grant
    Filed: June 3, 2019
    Date of Patent: June 16, 2020
    Assignee: ZTE Corporation
    Inventor: Jianjun Yu
  • Patent number: 10687126
    Abstract: Methods and systems for bias control in an optical switch fabric include monitoring optical power at outputs of a plurality of switch elements in an N×N switch fabric that has N inputs, N outputs, and M?2 stages, each switch element having a respective unique radio frequency tone. A bias control of each of the plurality of switch elements is adjusted. It is determined whether the optical power at the outputs of each respective switch element after bias control adjustment conform more closely to a predetermined criterion relative to the monitored optical power at the outputs of the respective switch element prior to adjustment.
    Type: Grant
    Filed: June 8, 2018
    Date of Patent: June 16, 2020
    Inventors: Nicolas Dupuis, Daniel M. Kuchta, Benjamin G. Lee, Alexander Rylyakov, Clint L. Schow
  • Patent number: 10681435
    Abstract: An apparatus and method for optimizing dynamically the performance of an optical network, said apparatus comprising at least one learning engine adapted to update a learning model in response to network metrics of said optical network collected during operation of said optical network, wherein the updated learning model is used to generate channel rank information for network channels; and a recommendation engine adapted to change a network channel throughput, a signal path and/or a spectral location of at least one network channel based on the channel rank information generated by the learning model of said learning engine.
    Type: Grant
    Filed: February 18, 2019
    Date of Patent: June 9, 2020
    Inventors: Danish Rafique, Thomas Szyrkowiec, Joerg-Peter Elbers
  • Patent number: 10673534
    Abstract: A signal processing method is provided. Under the method, a first digital signal can be obtained by an optical transmitter. The first digital signal is a one-dimensional bipolar digital signal. A spectral compression and filtering can be performed by the optical transmitter on the first digital signal to generate a second digital signal. A frequency shift can be performed by the optical transmitter on the second digital signal such that a center location of a spectrum of the frequency-shifted second digital signal is at a frequency of 0.
    Type: Grant
    Filed: May 30, 2019
    Date of Patent: June 2, 2020
    Inventors: Yanzhao Lu, Yuanda Huang
  • Patent number: 10673527
    Abstract: Disclosed is a satellite telecommunications system including at least one satellite in terrestrial orbit, referred to as optical gateway satellite, having a payload, the payload including a communication module, referred to as user module, capable of exchanging data with at least one terrestrial user terminal, and further including a communication module, referred to as gateway module, capable of exchanging data in the form of optical signals with at least one terrestrial optical gateway station. Also disclosed is a method for controlling such a satellite telecommunications system.
    Type: Grant
    Filed: December 1, 2017
    Date of Patent: June 2, 2020
    Inventor: Bernard Laurent
  • Patent number: 10673535
    Abstract: An example optical receiver may have an optical receiver front-end, four slicers, and a logic block. The optical receiver front-end may include a transimpedance amplifier to convert a photodiode output signal to a voltage signal. Three of the slicers may be data slicers, and one of the slicers may be an edge slicer. The slicers may each: shift the voltage signal based on an offset voltage set for the respective slicer, determine whether the shifted voltage signal is greater than a threshold value and generate a number of comparison signals based on the determining, and generate multiple digital signals by demuxing the comparison signals. The logic block may perform PAM-4 to binary decoding based on the data signals output by the data slicers and clock-and-data-recovery based on the digital signals output by the edge slicer.
    Type: Grant
    Filed: April 14, 2016
    Date of Patent: June 2, 2020
    Assignee: Hewlett Packard Enterprise Development LP
    Inventors: Cheng Li, Kunzhi Yu, Marco Fiorentino, Raymond G. Beausoleil
  • Patent number: 10666364
    Abstract: An optical-electrical interface device for coupling to an optical distribution network is provided which comprises: a housing, an optical fiber port for coupling to a single optical fiber, an optical network terminal unit connected to the optical fiber port, a power sourcing management unit configured to manage the power supply of the optical network, network terminal unit, a plurality of electrical ports and a plurality of electrical cables each connected to the power sourcing management unit and to one of the electrical ports. The electrical ports are accessible and/or arranged outside the housing, wherein the optical-electrical interface device is configured to reverse-feed electrical power, from external electrical module devices connected to the electrical ports, for operating the optical network terminal unit which is arranged inside the housing.
    Type: Grant
    Filed: October 5, 2016
    Date of Patent: May 26, 2020
    Assignee: Corning Optical Communications LLC
    Inventors: Roni Aharon Shurki, Martin Spreemann
  • Patent number: 10651938
    Abstract: Methods and apparatus for providing enhanced optical networking service and performance which are particularly advantageous in terms of low cost and use of existing infrastructure, access control techniques, and components. In the exemplary embodiment, current widespread deployment and associated low cost of Ethernet-based systems are leveraged through use of an Ethernet CSMA/CD MAC in the optical domain on a passive optical network (PON) system. Additionally, local networking services are optionally provided to the network units on the PON since each local receiver can receive signals from all other users. An improved symmetric coupler arrangement provides the foregoing functionality at low cost. The improved system architecture also allows for fiber failure protection which is readily implemented at low cost and with minimal modification.
    Type: Grant
    Filed: December 3, 2018
    Date of Patent: May 12, 2020
    Inventors: Jun Xu, Nanjian Qian
  • Patent number: 10637557
    Abstract: Technology for a multi-repeater system including wireless transmission of power from a first repeater to a second repeater is disclosed. A first and second repeater can be disposed opposite each other about a structural element. Wireless power can be transmitted from the first repeater through the structural element to the second repeater for use by the second repeater.
    Type: Grant
    Filed: April 6, 2018
    Date of Patent: April 28, 2020
    Inventor: Christopher Ken Ashworth
  • Patent number: 10627695
    Abstract: A Fourier-transform interferometer includes a phase change plate including a reflective layer configured to reflect a first light that is incident, and a meta surface configured to locally and differently change a phase of the first light that is reflected. The Fourier-transform interferometer further includes a photodetector configured to detect a second light, and a transflective mirror and a mirror configured to transmit a first part of a third light that is incident, to the phase change plate, transmit a remaining part of the third light, to the photodetector, and transmit the first light of which the phase is locally and differently changed, to the photodetector. The photodetector is further configured to detect an interference pattern between the remaining part of the third light and the first light of which the phase is locally and differently changed.
    Type: Grant
    Filed: November 13, 2018
    Date of Patent: April 21, 2020
    Inventor: Yeonsang Park
  • Patent number: 10630418
    Abstract: The present invention includes novel techniques, apparatus, and systems for optical WDM communications. Tunable lasers are employed to generate subcarrier frequencies representing subchannels of an ITU channel to which client signals can be mapped. Client circuits can be divided and combined before being mapped, independent of one another, to individual subchannels within and across ITU channels. Subchannels may be independently routed to a single subchannel receiver filter, such that each subchannel detected at the receiver may come from a different source location. Network architectures and subchannel transponders, muxponders and crossponders are disclosed, and techniques are employed (at the subchannel level/layer), to facilitate the desired optical routing, switching, concatenation and protection of client circuits mapped to these subchannels across the nodes of a WDM network. Subchannel hopping may also be used to increase the optical network security.
    Type: Grant
    Filed: December 21, 2017
    Date of Patent: April 21, 2020
    Assignee: Snell Holdings, LLC
    Inventor: Chris Wilhelm Barnard
  • Patent number: 10608663
    Abstract: Optical encoders for encoding signed, real numbers using optical fields are described. The optical fields may be detected using coherent detection, without the need for independent phase and amplitude control. This encoding technique enables the use of simple and non-ideal modulators (e.g., modulators that provide neither pure phase nor pure amplitude modulation) for high-precision encoding. A photonic system implementing optical encoding techniques may include a modulator configured to be driven by a single electrical modulating signal and a coherent receiver. An optical transformation unit optically coupled between the modulator and the coherent receiver may transform the phase and/or the intensity of the modulated optical field. The optical encoding techniques described herein may be used in a variety of contexts, including high-speed telecommunications, on chip-phase sensitive measurements for sensing, communications and computing, and optical machine learning.
    Type: Grant
    Filed: May 14, 2019
    Date of Patent: March 31, 2020
    Assignee: Lightmatter, Inc.
    Inventors: Michael Gould, Darius Bunandar, Shashank Gupta, Nicholas C. Harris
  • Patent number: 10601520
    Abstract: Optical network systems and components are disclosed, including a transmitter comprising a digital signal processor that receives data; circuitry that generate a plurality of electrical signals based on the data; a plurality of filters, each of which receiving a corresponding one of the plurality of electrical signals, a plurality of roll-off factors being associated with a respective one of the plurality of filters; a plurality of DACs that receive outputs from the digital signal processor, the outputs being indicative of outputs from the plurality of filters; a laser that supplies light; and a modulator that receives the light and outputs from the DACs, and supplies a plurality of optical subcarriers based on the outputs, such that one of the optical subcarriers has a frequency bandwidth that is wider than remaining ones of the optical subcarriers, said one of the optical subcarriers carrying information for clock recovery.
    Type: Grant
    Filed: February 7, 2019
    Date of Patent: March 24, 2020
    Assignee: Infinera Corporation
    Inventors: Han Henry Sun, Kuang-Tsan Wu, Steven Joseph Hand, Jeffrey T. Rahn
  • Patent number: 10601521
    Abstract: An optical data receiver includes optical hybrids, light detectors and a digital signal processor. Each optical hybrid outputs mixtures of a corresponding one of the polarization components of a received data-modulated optical carrier with reference light. Each light detector outputs digital measurements of the mixtures from a corresponding one of the optical hybrids. The digital signal processor identifies data symbols of a constellation having parts transmitted on both polarization components of the data-modulated optical carrier responsive to receipt of the digital measurements. The transmitted data-modulated optical carrier has about a same total light intensity in each modulation time slot thereof. Each data symbol is defined by in-phase and quadrature-phase electric field coordinates of both polarization components. Pairs of in-phase and quadrature-phase electric coordinates of each of the polarization components are on a preselected set of one or more concentric circles about an origin.
    Type: Grant
    Filed: May 14, 2018
    Date of Patent: March 24, 2020
    Assignee: Nokia Solutions and Networks Oy
    Inventors: Rene-Jean Essiambre, Roland Ryf, Muralidharan Kodialam
  • Patent number: 10594395
    Abstract: Systems and methods of compensating for the delay asymmetry of coherent optical modems in a packet optical network include measuring fill levels of one or more queues each including an elastic First-In-First-Out (FIFO) circuit used in a transport mapping scheme, wherein the transport mapping scheme is one or more of client mapping to Optical Transport Unit (OTU) and OTU mapping to Flexible OTN (FlexO); and performing adjustments in a clock based in part on the measured fill levels, wherein the adjustments are configured to reduce a Time Error (TE) in the packet network based on delay asymmetry between two nodes.
    Type: Grant
    Filed: July 23, 2018
    Date of Patent: March 17, 2020
    Assignee: Ciena Corporation
    Inventors: Bashar Abdullah, Daniel Perras, Sebastien Gareau, Xiaojin Liu