Dispersion Compensation Patents (Class 398/147)
  • Patent number: 11454768
    Abstract: A coherent receiver comprising: a signal port receiving the signal light that has two polarization components at right angles each other; a polarization dependent beam splitter (PBS) that splits the signal light into two portions depending on the polarizations contained in the signal light; a beam splitter (BS) that splits the local light into two portions; a multi-mode interference (MMI) device that interferes between one of the two portions of the signal light and one of the two portions of the local light; optical components provided between the PBS and the MMI device; and wherein the PBS splitting a first wavelength range of the signal light and a second wavelength range outside the first wavelength range.
    Type: Grant
    Filed: August 30, 2019
    Date of Patent: September 27, 2022
    Assignees: Sumitomo Electric Industries, Ltd., Sumitomo Electric Device Innovations, Inc.
    Inventors: Munetaka Kurokawa, Yasushi Fujimura, Ken Ashizawa, Satoru Kanemaru
  • Patent number: 11428785
    Abstract: A light detection and ranging (LIDAR) pixel includes a polarization controller, a grating coupler, and an optical mixer. The polarization controller includes a phase shifter that sets a phase of light in a first arm of the polarization controller and a second arm of the polarization controller.
    Type: Grant
    Filed: June 10, 2021
    Date of Patent: August 30, 2022
    Assignee: OURS Technology, LLC
    Inventors: Andrew Steil Michaels, Sen Lin
  • Patent number: 11381317
    Abstract: An optical receiving device that divides receive signals obtained by receiving an optical signal using a coherent detection scheme into a plurality of frequency bands, matches timing of the receive signals along a time axis between the frequency bands resulting from the division, performs a combining process of combining the receive signals contained in the plurality of frequency bands, and compensates the receive signals for waveform distortion either before or after the combining process, includes: a first wavelength dispersion compensation unit adapted to compensate the receive signals for waveform distortion in each of the frequency bands resulting from the division; a first nonlinear compensation unit adapted to compensate the receive signals belonging to each of the frequency bands and timed with each other in a time domain for a nonlinear optical effect; and a second wavelength dispersion compensation unit adapted to compensate the receive signals belonging to each of the frequency bands and compensate
    Type: Grant
    Filed: January 6, 2020
    Date of Patent: July 5, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Seiji Okamoto, Yoshiaki Kisaka, Masanori Nakamura
  • Patent number: 11368239
    Abstract: A wavelength conversion device includes a wavelength converter converts a wavelength band of a wavelength-division multiplex signal, a first wavelength filter transmits the wavelength-division multiplex signal on an input side of the wavelength converter, a second wavelength filter transmits the wavelength-division multiplex signal on an output side of the wavelength converter, and a controller controls a temperature of the wavelength converter such that a difference between a ratio of power of the wavelength-division multiplex signal which is not transmitted through the first wavelength filter on the input side to power of the wavelength-division multiplex signal which have been transmitted through the first wavelength filter on the input side and a ratio of a power of the wavelength-division multiplex signal which is not transmitted through the second wavelength filter on the output side to power of the wavelength-division multiplex signal which have been transmitted through the second wavelength filter.
    Type: Grant
    Filed: July 9, 2021
    Date of Patent: June 21, 2022
    Assignee: FUJITSU LIMITED
    Inventor: Tomoyuki Kato
  • Patent number: 11296790
    Abstract: A transmission system formed by connecting sites through an optical fiber stores at least unique information of the transmission functional devices for each site, connection information, and information of wavelength resources that can be accommodated in the optical fiber in a facility DB as DB information D2. When the number of wavelengths of order information for requesting the number of wavelengths required for transmission of optical signals between sites is larger than the number of wavelengths that can be accommodated in the optical fiber of the DB information D2, the number of wavelengths for each of the transmission functional devices required for enabling the number of wavelengths of the order information D1 to be accommodated in the optical fiber is designed using the design unit. Designed numbers of wavelengths are configured in the corresponding transmission functional devices using the configuration unit.
    Type: Grant
    Filed: May 8, 2019
    Date of Patent: April 5, 2022
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Toshihiko Seki, Osamu Okino, Hiroyuki Oyanagi, Yuichiro Ishizuka
  • Patent number: 11258512
    Abstract: A reception apparatus includes a dispersion compensation unit configured to acquire an electrical signal resulting from conversion of an optical signal and perform, on the electrical signal, dispersion compensation with a predetermined compensation amount, a clip rate measurement unit configured to measure a clip rate for the electrical signal subjected to the dispersion compensation, and a control unit configured to detect the compensation amount that minimizes the clip rate.
    Type: Grant
    Filed: May 8, 2019
    Date of Patent: February 22, 2022
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Seiji Okamoto, Masanori Nakamura, Kengo Horikoshi
  • Patent number: 11212070
    Abstract: Embodiments of this application provide a clock phase recovery apparatus and method, and a chip. The clock phase recovery apparatus includes an ADC, a dispersion compensation unit, a digital interpolator, a MIMO equalization unit, and a clock offset phase obtaining unit. The ADC is connected to the dispersion compensation unit, and the dispersion compensation unit is connected to a first input end of the digital interpolator. An output end of the digital interpolator is connected to an input end of the MIMO equalization unit, and an output end of the MIMO equalization unit is connected to an input end of the clock offset phase obtaining unit. The digital interpolator is configured to adjust, based on first offset phase information output by the clock offset phase obtaining unit, a dispersion-compensated signal output by the dispersion compensation unit.
    Type: Grant
    Filed: October 2, 2020
    Date of Patent: December 28, 2021
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Wentong Wan
  • Patent number: 11206085
    Abstract: A device (10;150;200) is configured to receive an optical signal. The device comprises a dispersion compensator (210a) comprising a plurality of optical dispersion compensator units (220). Each optical dispersion compensator unit comprises a plurality of delay elements (20;40). The dispersion compensator (210a) is configured to selectively activate one or more of the optical dispersion compensator units (220). The dispersion compensator (210a) is configured to compensate for dispersion of the optical signal with the activated one or more optical dispersion compensator unit (200).
    Type: Grant
    Filed: January 3, 2017
    Date of Patent: December 21, 2021
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Fabio Cavaliere, Michele Midrio, Marco Romagnoli, Vito Sorianello
  • Patent number: 11206084
    Abstract: [Problem] A signal distortion generated when a multi-level modulated optical signal is transmitted through an optical transmission path where optical amplifiers are scattered is suppressed and transmission quality is improved. [Solution] An optical transmission system 20 includes Tx 21a to Tx 21n configured to transmit a multi-level modulated optical signal 32 to an optical fiber 25, optical amplifiers 26a to 26f configured to amplify the optical signal 32 transmitted through the optical fiber 25, the optical amplifiers 26a to 26f being scattered on the optical fiber 25, and Rx 24a to Rx 24n configured to receive the amplified optical signal 32 via the optical fiber 25.
    Type: Grant
    Filed: June 26, 2019
    Date of Patent: December 21, 2021
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Minoru Yamaguchi, Kohei Saito, Tsutomu Kubo
  • Patent number: 11115128
    Abstract: The present invention provides an optical transmission device, a transmission system, and a control method for a transmission system which make it possible to adjust the wavelength band of dummy light according to the wavelength band of an added main signal. This optical transmission device comprises: an output branching unit which multiplexes and outputs an added main signal and dummy light; a wavelength adjustment unit which adjusts the wavelength band of the dummy light; a signal detection unit to which an optical signal outputted by the output branching unit is inputted, and which detects the wavelength band of the added main signal and outputs a detection result; and a control unit which controls the wavelength adjustment unit according to the detection result from the signal detection unit.
    Type: Grant
    Filed: January 23, 2019
    Date of Patent: September 7, 2021
    Assignee: NEC CORPORATION
    Inventor: Kazuhiro Ootaki
  • Patent number: 11101890
    Abstract: The present disclosure provides signal management with unequal eye spacing by: determining a dispersion slope of a channel between a transmitter and a receiver based on a temperature of the transmitter and a wavelength used by the transmitter to transmit signals over the channel; determining maximum and minimum powers for transmission over the channel; assigning a plurality of rails to a corresponding plurality of power levels, wherein amplitude differences between adjacent rails of the plurality of rails are based on the dispersion slope and produce a first eye pattern with a first Ratio of Level Mismatch (RLM) less than one; encoding, by the transmitter, data onto a conditioned signal according to the plurality of rails; and transmitting the conditioned signal over the channel, so that the conditioned signal demonstrates a second eye pattern with a second RLM greater than the first RLM when received at the receiver.
    Type: Grant
    Filed: July 20, 2020
    Date of Patent: August 24, 2021
    Assignee: Cisco Technology, Inc.
    Inventors: Marco Mazzini, Christopher R. S. Fludger, Alberto Cervasio, Matthew J. Traverso
  • Patent number: 11044019
    Abstract: A tunable optical dispersion compensator (TODC) for providing chromatic dispersion (CD) compensation of optical signals in a plurality of optical channels comprises: a plurality of CD compensation fibers; a tunable optical switch configurable for directing an optical signal in any of the plurality of optical channels to one of the plurality of fibers, dependent on a central wavelength of the optical signal; a first switch configurable for directing all signals in the plurality of optical channels to a first CD compensation fiber, in a first mode of operation, and for bypassing the first CD compensation fiber in a second mode of operation; and, the first CD compensation fiber, wherein the first switch and the tunable optical switch are connected so as to enable combining CD compensation provided by the first CD compensation fiber and CD compensation provided by any one of the plurality of CD compensation fibers.
    Type: Grant
    Filed: May 13, 2019
    Date of Patent: June 22, 2021
    Assignee: Accelink Technologies Co., Ltd.
    Inventors: Lijie Qiao, Qinlian Bu, Li Xiao
  • Patent number: 10990966
    Abstract: A computer-implemented method for receipt management includes receiving, using a mobile wallet stored on a mobile device of a user, receipts that include a record of transactions between the user and one or more merchants, the transactions being performed using the mobile wallet account of the user. The method includes receiving receipts for transactions that were not performed using the mobile wallet account of the user, the receipts being received from a user e-mail address, the receipts for non-mobile wallet transactions being received by the mobile wallet of the user. The method includes aggregating the mobile wallet receipts with the receipts of non-mobile wallet transactions and retrieving and displaying one or more of the mobile wallet receipts and the receipts of non-mobile wallet transactions.
    Type: Grant
    Filed: March 18, 2019
    Date of Patent: April 27, 2021
    Assignee: Wells Fargo Bank, N.A.
    Inventors: Stephen M. Ellis, Michael J. Kennedy, Ashish Bhoopen Kurani, Melissa Lowry, Uma Meyyappan, Bipin M. Sahni, Nikolai Stroke
  • Patent number: 10958338
    Abstract: Short-term optical recovery systems and methods in coherent optical receivers minimize recovery time for fault scenarios and signal reacquisition while maintaining robust signal acquisition. The short-term optical recovery systems and methods include special techniques and algorithms to minimize recovery time, making coherent systems similar in time as conventional direct detection recovery. The short-term optical recovery systems and methods include an expedited acquisition engine that includes a reference clock recovery, a compensator to remove chromatic dispersion, a burst framer, and a compensator to remove polarization dispersion. Importantly, the expedited acquisition engine uses a memory oriented architecture to allow some properties of the acquisition engine to be stored during initial acquisition and, hence, later on be deployed in any fault scenario to expedite further recovery of a signal.
    Type: Grant
    Filed: August 3, 2015
    Date of Patent: March 23, 2021
    Assignee: Ciena Corporation
    Inventors: Hamid Mehrvar, Salih Jasarevic, Bernard Thiboutot, David Doucet
  • Patent number: 10951345
    Abstract: A transmitter generates a burst signal obtained by multiplexing signals of a first polarization and a second polarization orthogonal to each other, and including, at the beginning thereof, a pilot sequence in which the first and the second polarizations each have single frequency components of a first frequency and a second frequency different from each other. A coherent light reception unit performs conversion into an electrical signal by allowing received light and local light to interfere with each other. A pilot sequence detection unit detects a pilot sequence from the converted electrical signal. The polarization estimation unit estimates polarization states of the first polarization and the second polarization at a receiver from frequency components corresponding to the first frequency, and the second frequency. An equalizer demultiplexes the first polarization and the second polarization on the basis of the estimated polarization states.
    Type: Grant
    Filed: August 28, 2017
    Date of Patent: March 16, 2021
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Keisuke Matsuda, Ryosuke Matsumoto, Naoki Suzuki
  • Patent number: 10951964
    Abstract: Described are various configurations of reduced crosstalk optical switches. Various embodiments can reduce or entirely eliminate crosstalk using a coupler that has a power-splitting ratio that compensates for amplitude imbalance caused by phase modulator attenuation. Some embodiments implement a plurality of phase modulators and couplers as part of a dilated switch network to increase overall bandwidth and further reduce potential for crosstalk.
    Type: Grant
    Filed: April 3, 2020
    Date of Patent: March 16, 2021
    Assignee: Juniper Networks, Inc.
    Inventor: Jonathan Edgar Roth
  • Patent number: 10892923
    Abstract: A signal output circuit includes: a driver circuit including a variable current source and configured to output a multilevel signal; a replica circuit having a circuit configuration equivalent to the driver circuit; and a control circuit configured to control a characteristic of the driver circuit, based on an output signal of the replica circuit, wherein the replica circuit includes: a first replica circuit part configured to output first output signals having signal levels of a first subset of a plurality of signal levels corresponding to the multilevel signal; and a second replica circuit part configured to output second output signals having signal levels of a second subset of the plurality of signal levels, and the control circuit is configured to control a characteristic of the variable current source, based the first output signals and the second output signals.
    Type: Grant
    Filed: January 23, 2019
    Date of Patent: January 12, 2021
    Assignee: SOCIONEXT INC.
    Inventors: Taku Hiramatsu, Shigeaki Kawai
  • Patent number: 10873398
    Abstract: An optical signal transmission apparatus and a method are provided. The apparatus may include a set of optical transmitters, each optical transmitter configured for transmission of light signals at one or more wavelengths of light. The apparatus may include an output port configured for transmission of the light signals through a span of optical fiber. The apparatus may use an input port configured to receive other transmissions of light signals through the span of optical fiber. The apparatus may include a set of light detectors, each light detector configured to detect a time delay or phase characteristic associated with the one or more wavelengths of light. The apparatus may include a processor configured to determine a metric based on the detected time delay or phase characteristic.
    Type: Grant
    Filed: July 30, 2019
    Date of Patent: December 22, 2020
    Assignee: Molex, LLC
    Inventors: Lifu Gong, Gongjian Hu, Yi Liao, Glenn Lee, Guojiang Hu
  • Patent number: 10819432
    Abstract: A receiver is configured to calculate a representation of a received signal conveying symbols at a frequency fS, the representation comprising non-zero components at frequencies of magnitudes exceeding fS/2. The receiver calculates a first term comprising a function of a phase difference between the representation at a first pair of frequencies separated by a gap ? and comprised within a first band of width 2? centered at fS/2, and a second term comprising a function of a phase difference between the representation at a second pair of frequencies separated by the gap ? and comprised within a second band of width 2? centered at ?fS/2, wherein ?<2?, and wherein the higher frequency of the first pair and the higher frequency of the second pair are separated by the frequency fS. An estimate of chromatic dispersion in the received signal is calculated based on the first term and the second term.
    Type: Grant
    Filed: November 18, 2019
    Date of Patent: October 27, 2020
    Assignee: CIENA CORPORATION
    Inventors: Shahab Oveis Gharan, Lukas Jakober
  • Patent number: 10805009
    Abstract: An optical modulation apparatus that can adjust modulation timing. A timing adjuster adjusts the modulation timing on the basis of an intensity detected by a light intensity detector, after a data generator respectively generates, as a first data signal and a second data signal, a first test data signal and a second test data signal each having a data string containing a test pattern in which a plurality of continuous marks and a plurality of continuous spaces are alternately repeated, and after a phase adjuster adjusts a phase difference to zero or ?.
    Type: Grant
    Filed: May 22, 2017
    Date of Patent: October 13, 2020
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Shusaku Hayashi, Kentaro Enoki, Koichi Akiyama
  • Patent number: 10803450
    Abstract: A mobile device is configured to receive a first receipt pertaining to a first mobile wallet transaction of a user, the first receipt being a digital receipt and receive information pertaining to a plurality of transactions of the user. The mobile device is also configured to capture an image of a second receipt pertaining to the second mobile wallet transaction of the user, the second receipt being a physical receipt. The mobile device is also configured to generate an image of the first receipt of the use and extract identifying information regarding the first and second mobile wallet transactions from the first and second images, identify the first and second mobile wallet transactions within the plurality of transactions based on information extracted from the images of the first and second receipts, and associate the images of the first and second receipts with the first and second mobile wallet transactions.
    Type: Grant
    Filed: January 12, 2018
    Date of Patent: October 13, 2020
    Assignee: Wells Fargo Bank, N.A.
    Inventors: Stephen M. Ellis, Michael J. Kennedy, Ashish Bhoopen Kurani, Melissa Lowry, Uma Meyyappan, Bipin M. Sahni, Nikolai Stroke
  • Patent number: 10771230
    Abstract: An estimating apparatus for bias drift of a transmitting end modulator, a compensating apparatus, a receiver and a method are disclosed. Estimation and compensation of the bias drift are performed directly at the receiving end according to phase recovered received signals, with no need of providing an extra bias control circuit at the transmitting end. Estimating and compensating for the bias drift includes recovering received signals by removing a frequency difference and a phase difference between a transmitting end laser and a receiving end laser producing phase recovered received signals, estimating the bias drift of the transmitting end modulator according to the phase recovered received signals and compensating the bias drift of the transmitting end modulator in a receiver.
    Type: Grant
    Filed: October 12, 2016
    Date of Patent: September 8, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Liang Dou, Zhenning Tao
  • Patent number: 10771162
    Abstract: The technology disclosed in this patent document can be implemented to provide an analog front part of an optical receiver module for coherent optical detection where the optical receiver module receives the optical input from a fiber link, performs optical to electrical conversion and analog processing for carrier frequency compensation, optical phase noise compensation and polarization rotation, and generates an analog electrical output for subsequent signal processing for coherent optical detection. The analog processing for the polarization rotation is placed downstream from the analog processing for carrier frequency compensation, and in some implementations, downstream from the analog processing for optical phase noise compensation.
    Type: Grant
    Filed: February 15, 2019
    Date of Patent: September 8, 2020
    Assignee: GREENSAND NETWORKS INC.
    Inventor: Edem Ibragimov
  • Patent number: 10720992
    Abstract: There is provided a transmission apparatus including a transmitter configured to modulate a signal to a first signal having a first wavelength and a signal to a second signal having a second wavelength, and transmit the first signal and the second signal to a transmission line so that the second signal is varied in accordance with variation in an amount of cross phase modulation of the first signal passing through each position on the transmission line, and a signal processor configured to include at least one of a logic device and a processor, and configured to add an amount of chromatic dispersion at which a remaining amount of chromatic dispersion of the first wavelength at a certain position on the transmission line is equal to zero to the first wavelength in the transmission of the first signal and the second signal.
    Type: Grant
    Filed: June 19, 2018
    Date of Patent: July 21, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Takahito Tanimura, Takeshi Hoshida, Shigeki Watanabe, Tomoyuki Kato
  • Patent number: 10680788
    Abstract: Embodiments of the present disclosure may relate to a transceiver to transmit and receive concurrently radio frequency (RF) signals via a dielectric waveguide. In embodiments, the transceiver may include a transmitter to transmit to a paired transceiver a channelized radio frequency (RF) transmit signal via the dielectric waveguide. A receiver may receive from the paired transceiver a channelized RF receive signal via the dielectric waveguide. In embodiments, the channelized RF receive signal may include an echo of the channelized RF transmit signal. The transceiver may further include an echo suppression circuit to suppress from the channelized RF receive signal the echo of the channelized RF transmit signal. In some embodiments, the channelized RF transmit signal and the channelized RF receive signal may be within a frequency range of approximately 30 gigahertz (GHz) to approximately 1 terahertz (THz), and the transceiver may provide full-duplex millimeter-wave communication.
    Type: Grant
    Filed: September 11, 2018
    Date of Patent: June 9, 2020
    Assignee: Intel Corporation
    Inventors: Georgios C. Dogiamis, Telesphor Kamgaing, Emanuel Cohen, Sasha N. Oster
  • Patent number: 10634973
    Abstract: An optical device includes an array of unit optical elements. Each of the unit optical elements includes a plurality of amplitude adjustment (AA) elements, each of the plurality of AA elements configured for processing one of different phases of an optical signal; an optical antenna, and a combining mechanism for optically coupling the plurality of AA elements to the optical antenna. The optical device also includes a controller coupled to the plurality of AA elements, the controller configured for generating control signals for the plurality of AA elements according to a target optical beam pattern.
    Type: Grant
    Filed: August 2, 2017
    Date of Patent: April 28, 2020
    Assignee: University of Southern California
    Inventors: Hossein Hashemi, SungWon Chung, Hooman Abediasl
  • Patent number: 10623033
    Abstract: Aspects of the subject disclosure may include, a system for receiving first electromagnetic waves that propagate along a physical transmission medium. The first electromagnetic waves can convey first signals in a first frequency range and second signals in a second frequency range, whereby a first spectral location of the first frequency range exceeds a second spectral location of the second frequency range. The system can further perform frequency converting of the first signals in the first frequency range to a first updated frequency range, frequency converting the second signals in the second frequency range to a second updated frequency range and generating second electromagnetic waves that propagate along the physical transmission medium and that convey the first signals in the first updated frequency range and the second signals in the second updated frequency range. Other embodiments are disclosed.
    Type: Grant
    Filed: November 29, 2018
    Date of Patent: April 14, 2020
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Paul Shala Henry, Giovanni Vannucci, Thomas M. Willis, III
  • Patent number: 10523333
    Abstract: An optical signal transmission apparatus generates a multi-level optical signal from a multi-level electric signal. The optical signal transmission apparatus detects, based on a supervisory signal generated from an optical signal, an electric-to-optical (E/O) conversion characteristic of an E/O converter configured to convert an electric signal into an optical signal. For example, when the E/O converter generates a multi-level optical signal from a multi-level electric signal based on a bias signal, the optical signal transmission apparatus determines a correspondence relationship between the bias signal and the optical signal. The optical signal transmission apparatus adjusts a use range of intensities of the bias signal based on the determined correspondence relationship so that the E/O converter may linearly operate.
    Type: Grant
    Filed: June 29, 2018
    Date of Patent: December 31, 2019
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Jie Hyun Lee, Sun Hyok Chang, Joon Young Huh, Sae-Kyoung Kang, Joon Ki Lee
  • Patent number: 10523323
    Abstract: A method and apparatus for compensation of a chromatic dispersion through an optical compensation and an electronical compensation in optical communication. An optical communication method receives an optical signal, estimates a first transmission length based on a null component included in a frequency spectrum of the optical signal, optically compensates for a chromatic dispersion of the optical signal based on the first transmission length, estimates a second transmission length based on a null component included in a frequency spectrum of the compensated optical signal, and electronically compensates for a residual chromatic dispersion of the compensated optical signal based on the second transmission length.
    Type: Grant
    Filed: December 3, 2018
    Date of Patent: December 31, 2019
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Hun Sik Kang, Sang Rok Moon, Seung-Woo Lee, Sun Hyok Chang, In Ki Hwang
  • Patent number: 10495794
    Abstract: A polarization insensitive optical phased array is provided, for LIDAR or other purposes. A polarization rotator splitter or two-dimensional grating coupler provides two components of co-polarized (e.g. TE-polarized) light. Each component can be routed to a separate optical phased array (OPA) component, and light output of one of the OPA components is rotated in polarization by use of a half wave plate. A polarization controller can receive and control the two components of co-polarized light and then passes the controlled light to the two OPA components. A single OPA component can also be used along with a controller which combines the two components of co-polarized light into a single output, passed to the single OPA component.
    Type: Grant
    Filed: December 12, 2017
    Date of Patent: December 3, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Chunshu Zhang, Eric Bernier, Dominic John Goodwill
  • Patent number: 10439751
    Abstract: Multiple receivers are comprised in a flexible coherent transceiver of a multi-span optical fiber network. Each of the multiple receivers is operative to handle communications on a respective channel. The multiple receivers measure optical characteristics. For each of the multiple receivers, the optical characteristics include optical nonlinear interactions on the respective channel, the optical nonlinear interactions being at least partially dependent from one span to another span. An optical power of a signal on each of the multiple channels is adjusted as a function of the optical characteristics.
    Type: Grant
    Filed: October 27, 2017
    Date of Patent: October 8, 2019
    Assignee: Ciena Corporation
    Inventors: Kim B. Roberts, James Harley, Qunbi Zhuge, Michael Andrew Reimer, Maurice O'Sullivan
  • Patent number: 10401564
    Abstract: Aspects of the present disclosure describe fiber nonlinearity induced transmission penalties are reduced both in fibers with large polarization-mode dispersion, and in coupled-core multicore fibers (CC-MCF). In the case of coupled multi-core fibers, the requirement for modal delay is less.
    Type: Grant
    Filed: October 9, 2018
    Date of Patent: September 3, 2019
    Assignee: NEC CORPORATION
    Inventors: Fatih Yaman, Shaoliang Zhang, Eduardo Mateo Rodriguez, Takanori Inoue, Kohei Nakamura, Yoshihisa Inada, Takaaki Ogata
  • Patent number: 10404398
    Abstract: Aspects of the present disclosure describe systems, methods, and structures for passive optical add/drop multiplexing (POADM) architectures that remove the prior art requirement of an optical amplifier (i.e., repeater-less) at the POADM nodes.
    Type: Grant
    Filed: March 6, 2018
    Date of Patent: September 3, 2019
    Assignee: NEC CORPORATION
    Inventors: Ezra Ip, Yue-Kai Huang, Shuji Murakami, Philip Ji
  • Patent number: 10382140
    Abstract: A sparse optical phased array transmitter/receiver includes, in part, a multitude of transmitting/receiving elements that are sparsely positioned. Accordingly, the transmitting/receiving elements are not uniformly distributed at equal distance intervals along a one-dimensional, two-dimensional, or a three-dimensional array. The positions of the transmitting/receiving elements may or may not conform to an ordered pattern.
    Type: Grant
    Filed: June 7, 2017
    Date of Patent: August 13, 2019
    Assignee: CALIFORNIA INSTITUTE OF TECHNOLOGY
    Inventors: Seyed Mohammadreza Fatemi, Seyed Ali Hajimiri, Behrooz Abiri, Aroutin Khachaturian
  • Patent number: 10372013
    Abstract: Monitoring output power levels of a carrier-effect based switching cell allows phase errors resulting from driving a PIN or PN junction of the switching cell to be dynamically compensated for. The compensation may also allow for compensating of phase errors resulting from the phase imbalance of input couplers as well as phase errors from the waveguide due to fabrication variations. By dynamically compensating for phase errors caused by the driving of the PIN or PN junction, the extinction ratio of the carrier-effect based switching cell can be increased.
    Type: Grant
    Filed: April 12, 2016
    Date of Patent: August 6, 2019
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Jia Jiang, Dominic John Goodwill, Eric Bernier
  • Patent number: 10338316
    Abstract: In order to provide a configuration for suppressing deterioration in the transmission quality of a signal light due to a nonlinear phenomenon in an optical fiber, a polarization dispersion adder is provided with: a polarization rotation unit which, with respect to each pulse of signal light generated by modulating a light carrier, rotates and outputs the polarization of the pulse during a period from a pulse rise start time (T0) to a pulse fall completion time (T1); and a delay addition unit which adds a delay of an amount corresponding to the rotation amount of the polarization added by the polarization rotation unit to the pulse outputted from the polarization rotation unit.
    Type: Grant
    Filed: August 19, 2015
    Date of Patent: July 2, 2019
    Assignee: NEC Corporation
    Inventor: Takehiro Nakano
  • Patent number: 10333626
    Abstract: An embodiment device includes an optical source configured to generate an optical carrier including an optical pulse train; and a modulator configured to modulate an amplitude of the optical pulse train, based on data generated by a data source, to produce a modulated optical signal.
    Type: Grant
    Filed: August 22, 2018
    Date of Patent: June 25, 2019
    Assignee: STMICROELECTRONICS (RESEARCH & DEVELOPMENT) LIMITED
    Inventors: Neale Dutton, Denise Lee, Graeme Storm
  • Patent number: 10333621
    Abstract: We disclose an optical transport system configured to reduce nonlinear signal distortions using an electronic phase rotation, the phase value of which is determined using pre-filtering, e.g., via a low-pass filter, of the digital samples representing an optical communication signal prior to applying a squaring operation to the digital samples. In some embodiments, the phase value used in the electronic phase rotation can be determined using double filtering of the digital samples that, in addition to the pre-filtering, employs post-filtering, e.g., via another low-pass filter, of the digital samples generated by the squaring operation. The electronic phase rotation can be implemented as part of a backward-propagation algorithm that, in addition to reducing the nonlinear signal distortions, provides at least partial dispersion compensation. In various embodiments, the corresponding backward-propagation module can be incorporated into the transmitter's digital signal processor (DSP) or the receiver's DSP.
    Type: Grant
    Filed: February 16, 2017
    Date of Patent: June 25, 2019
    Assignee: NOKIA OF AMERICA CORPORATION
    Inventors: René-Jean Essiambre, Chongjin Xie
  • Patent number: 10313008
    Abstract: A measurement method and apparatus for residual direct-current components and a system where the measurement method includes: selecting a section of data of a first predetermined length respectively from received signals in two polarization states; performing a coordinate transform on the two selected sections of data to obtain a group of vectors of Strokes space; and determining a difference between power of the residual direct-current components according to the group of vectors of Strokes space. With the embodiments of this disclosure, residual direct-current components of an optical transmitter may be measured at a receiver end of a coherent optical communication system, thereby avoiding diagnosis errors of a communication network, and improving performance of the communication system.
    Type: Grant
    Filed: July 31, 2017
    Date of Patent: June 4, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Hao Chen, Zhenning Tao
  • Patent number: 10298813
    Abstract: A camera and imaging method with nonclassical imaging resolution, for applications in long-distance imaging, such as satellite and aircraft-to-ground based distant imaging, utilizing an intensity-fluctuation correlation measurement of thermal light.
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: May 21, 2019
    Assignee: University of Maryland Baltimore County
    Inventors: Jane Sprigg, Ian Tolfree, Yanhua Shih
  • Patent number: 10270537
    Abstract: A method for preventing nonlinear interference in an optical communication system. The method may include selecting an optical signal of a first optical channel. The method may include determining an estimate of inter-channel nonlinear interference to the optical signal of the first optical channel. The inter-channel nonlinear interference may be generated by one or more optical signals transmitted over a second optical channel in the optical communication system. The method may include determining one or more linear filters based on the estimate of the inter-channel nonlinear interference. The method may include pre-distorting an optical signal for transmission over the second optical channel using the one or more linear filters. The pre-distorted optical signal may be configured for reducing the inter-channel nonlinear interference to the first optical signal of the first optical channel.
    Type: Grant
    Filed: September 18, 2017
    Date of Patent: April 23, 2019
    Assignee: Ciena Corporation
    Inventors: Qunbi Zhuge, Michael Andrew Reimer, Shahab Oveis Gharan, Maurice Stephen O'Sullivan
  • Patent number: 10243674
    Abstract: Methods and systems for a distributed optoelectronic receiver are disclosed and may include an optoelectronic receiver having a grating coupler, a splitter, a plurality of photodiodes, and a plurality of transimpedance amplifiers (TIAs). The receiver receives a modulated optical signal utilizing the grating coupler, splits the received signal into a plurality of optical signals, generates a plurality of electrical signals from the plurality of optical signals utilizing the plurality of photodiodes, communicates the plurality of electrical signals to the plurality of TIAs, amplifies the plurality of electrical signals utilizing the plurality of TIAs, and generates an output electrical signal from coupled outputs of the plurality of TIAs. Each TIA may be configured to amplify signals in a different frequency range. One of the plurality of electrical signals may be DC coupled to a low frequency TIA of the plurality of TIAs.
    Type: Grant
    Filed: May 11, 2018
    Date of Patent: March 26, 2019
    Assignee: Luxtera, Inc.
    Inventors: Brian Welch, Gianlorenzo Masini
  • Patent number: 10236981
    Abstract: A processor of an apparatus is configured to apply one or more control algorithms using estimated data to adjust the one or more control parameters of a section of an optical fiber network. The estimated data are derived from measurements of optical signals in the section and from knowledge of the section. The estimated data is a function of optical nonlinearity and of amplified spontaneous emission.
    Type: Grant
    Filed: July 13, 2017
    Date of Patent: March 19, 2019
    Assignee: Ciena Corporation
    Inventors: James Harley, Kim B. Roberts, David Boertjes
  • Patent number: 10218436
    Abstract: A method and apparatus for determining in-band OSNR in optical information signals, e.g. in polarization-multiplexed QPSK and higher-order M-ary QAM signals, are disclosed. A correlation measurement of the signal amplitude or power at two distinct optical frequencies of the signal may be used to determine the in-band optical noise in the signal. A measurement of the signal power may be used to determine the OSNR based on the determined in-band noise.
    Type: Grant
    Filed: October 18, 2017
    Date of Patent: February 26, 2019
    Assignee: VIAVI SOLUTIONS INC.
    Inventor: Fred L. Heismann
  • Patent number: 10212015
    Abstract: A receiving device includes an optical filter, an acquisition unit, a first determination unit, and a filter setting unit. The optical filter transmits an optical DMT signal received from a sending device. The acquisition unit acquires the transmission characteristics of the optical DMT signal received from the sending device. The first determination unit determines a filter frequency of the optical filter that removes a dip from the optical DMT signal on the basis of the acquired transmission characteristics. The filter setting unit sets the determined filter frequency in the optical filter.
    Type: Grant
    Filed: January 12, 2016
    Date of Patent: February 19, 2019
    Assignee: FUJITSU LIMITED
    Inventors: Ryou Okabe, Tomoo Takahara, Toshiki Tanaka, Masato Nishihara
  • Patent number: 10185164
    Abstract: An optical frequency control device includes a light source for emitting light, a sawtooth wave generator for generating a sawtooth wave, a frequency controller for controlling the frequency of the sawtooth wave, and an optical phase modulator driven by the sawtooth wave for carrying out phase modulation of the light.
    Type: Grant
    Filed: August 31, 2015
    Date of Patent: January 22, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Eisuke Haraguchi, Toshiyuki Ando
  • Patent number: 10181942
    Abstract: An optical signal generation device in an optical communication system includes a control signal manager that outputs the number of information sequences and control signals, a timing manager that outputs a timing signal, signal multiplexers that generate multiplexed signal sequences by multiplexing in a time-division manner transmission information sequences and the control signals, pulse converters that convert the multiplexed signal sequences to pulse signal sequences, and transmission processing units that send transmission signal sequences whose intensities correspond to values of the pulse signal sequences. Each control signal includes an identification signal allowing each transmission information sequence to be identified, the timing signals change their values on a cycle of the minimum pulse width of the pulse signal sequences, and time positions at which values of the N timing signals vary are different from one another.
    Type: Grant
    Filed: November 12, 2015
    Date of Patent: January 15, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventor: Masataka Imao
  • Patent number: 10171198
    Abstract: The present invention relates to A channel set up method of optical receiver with wavelength tunable filter such as an etalon filter in a TO type received wavelength-tunable optical receiver. According to the method of setting a channel in a wavelength-tunable optical receiver of the present invention, by circularly receiving communication channels within a predetermined temperature range, in which selectively receiving communication channel using two adjacent transmissive modes in the transmissive modes of a wavelength-tunable filter, it is possible to individually select and receive all communication channels with a predetermined temperature range. Further, it is possible to use all FP type etalon filters regardless of transmissive wavelength characteristics in at a specific temperature of a wavelength-tunable filter, so it is possible to reduce a manufacturing cost and power consumption of a product and increase thermal stability of a package.
    Type: Grant
    Filed: August 10, 2015
    Date of Patent: January 1, 2019
    Assignee: PHOVEL. CO.LTD.
    Inventor: Jeong-Soo Kim
  • Patent number: 10139699
    Abstract: A communications device may include a local device, a remote device, and a multi-mode optical fiber coupled between the local device and the remote device. The local device may include a local spatial optical mux/demux coupled to the multi-mode optical fiber and having first and second local optical outputs and first and second local optical inputs, and a local electro-optic E/O modulator coupled to the second local optical input. The remote device may include a remote spatial optical mux/demux coupled to the multi-mode optical fiber, and a remote E/O modulator configured to generate a modulated signal onto a first remote optical output based upon modulating the first optical carrier signal from a first remote optical input responsive to a radio frequency (RF) electrical input signal.
    Type: Grant
    Filed: March 9, 2017
    Date of Patent: November 27, 2018
    Assignee: HARRIS CORPORATION
    Inventors: John R. DeSalvo, Catheryn D. Logan, Charles F. Middleton, Elliott J. Grafer
  • Patent number: 10142022
    Abstract: Adjustment of one or more control parameters of a section of an optical fiber network involves taking measurements of optical signals in the section, deriving estimated data from the measurements and from knowledge of the section, where the estimated data is a function of optical nonlinearity and of amplified spontaneous emission, and applying one or more control algorithms using the estimated data to adjust the one or more control parameters.
    Type: Grant
    Filed: May 24, 2017
    Date of Patent: November 27, 2018
    Assignee: Ciena Corporation
    Inventors: James Harley, Kim B. Roberts, David Boertjes