Dispersion Compensation Patents (Class 398/147)
  • 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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
  • 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: 10122443
    Abstract: A technique is provided for determining an optical transmission system description. The technique includes determining a dispersion map of the optical transmission system, placing a set of discrete cumulative dispersions onto the dispersion map, and defining a plurality of sequential system segments of the optical transmission system. Each system segment has an input point that corresponds to a point in the optical transmission system where the input cumulative dispersion matches a cumulative dispersion of the set of discrete cumulative dispersions. For each system segment, an input power of the system segment and a local dispersion value of the system segment is determined. Also, for each system segment, a sequence number of the system segments is stored. Furthermore, for each system segment, the input power and the local dispersion value determined in relation with the input cumulative dispersion of the system segment in a data repository is stored.
    Type: Grant
    Filed: September 29, 2015
    Date of Patent: November 6, 2018
    Assignee: Alcatel Lucent
    Inventors: Emmanuel Seve, Petros Ramantanis, Jean-Christophe Antona, Sebastien Bigo
  • Patent number: 10082717
    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: September 25, 2018
    Assignee: HARRIS CORPORATION
    Inventors: John R. DeSalvo, Catheryn D. Logan, Charles F. Middleton, Elliott J. Grafer
  • Patent number: 10079643
    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: November 23, 2016
    Date of Patent: September 18, 2018
    Assignee: STMICROELECTRONICS (RESEARCH & DEVELOPMENT) LIMITED
    Inventors: Neale Dutton, Denise Lee, Graeme Storm
  • Patent number: 10063317
    Abstract: A method and system for selective and per-node XPM compensation may separate wavelengths into short traveling wavelengths (STW) and long traveling wavelengths (LTW) based on transmission distance over their respective optical paths. XPM compensation at ROADM nodes may be selectively performed for the LTW, while the STW may be passed through without XPM compensation, among other functionality at the ROADM nodes.
    Type: Grant
    Filed: August 25, 2017
    Date of Patent: August 28, 2018
    Assignee: Fujitsu Limited
    Inventors: Olga Vassilieva, Inwoong Kim, Tadashi Ikeuchi
  • Patent number: 10038506
    Abstract: A transceiver for fiber optic communications. The transceiver can include a transmitter module having a transmitter host interface configured to receive an input host signal; a transmitter framer configured to frame the input host signal and to generate a framed host signal; and a transmitter coder configured to encode the framed host signal to generate an encoded host signal for transmission over a communication channel. The transceiver can also include a receiver module having a bulk chromatic dispersion, fiber length estimation, and coarse carrier recovery circuit configured to equalize a digital input ingress signal to generate an equalized ingress signal; a receiver framer configured to frame the equalized ingress signal to generate a framed ingress signal; and a receiver host interface configured to output the framed ingress signal. The receiver host interface is compatible with a framing protocol of the receiver framer.
    Type: Grant
    Filed: November 1, 2017
    Date of Patent: July 31, 2018
    Assignee: INPHI CORPORATION
    Inventors: Diego Ernesto Crivelli, Mario Rafael Hueda, Hugo Santiago Carrer, Jeffrey Zachan, Vadim Gutnik, Martin Ignacio Del Barco, Ramiro Rogelio Lopez, Shih Cheng Wang, Geoffrey O. Hatcher, Jorge Manuel Finochietto, Michael Yeo, Andre Chartrand, Norman L. Swenson, Paul Voois, Oscar Ernesto Agazzi
  • Patent number: 10033467
    Abstract: A method and apparatus for generating sub-carriers is disclosed. Coherent optical sub-carriers with sub-carrier spacing are generated for carrying an orthogonal frequency division multiplexed (OFDM) signal. Multiple peaks are generated by cascading multiple phase modulators driven by different radio frequency sources.
    Type: Grant
    Filed: April 25, 2012
    Date of Patent: July 24, 2018
    Assignees: ZTE CORPORATION (CHINA), ZTB (USA) Inc.
    Inventors: Hung-Chang Chien, Jianjun Yu
  • Patent number: 10027425
    Abstract: A method for optical and electrical signal processing of a multi-heterodyne signal generated by a multi-mode semi-conductor laser, for a system comprising two laser sources and an sample interaction unit. At least the beam of one of the laser passes through said sample interaction unit before being combined on a detector. The first laser is tuned (40=>42) by an amount keeping the tuning result within the available detector bandwidth (55). Then the second laser is roughly tuned by the same amount as the tuning of the first laser to bring back the signal to the vicinity (48) of the original place in the RF-domain and within the bandwidth (55) of the detector. The tuning steps are repeated with different value of mode spacing for reconstructing the sample spectrum and provide a high resolution image of the dip (41) absorption line (40).
    Type: Grant
    Filed: June 16, 2015
    Date of Patent: July 17, 2018
    Assignee: ETH Zurich
    Inventors: Andreas Hugi, Gustavo Filipe Ferreira Villares, Jérôme Faist
  • Patent number: 9973278
    Abstract: Techniques for transmitting an optical signal through optical fiber with an improved stimulated Brillouin scattering (SBS) suppression and an improved transmitter's signal to noise ratio (SNR) include externally modulating a light beam emitted from a light source with a high frequency signal. The light beam is also modulated externally with an RF information-carrying signal. The high frequency signal is at least twice a highest frequency of the RF signal. The high frequency signal modulating the light source can be split, providing a portion of the split signal to a phase and gain control circuit for adjusting a phase/gain. The output of phase and gain control circuit can be applied to the external modulator to eliminate intensity modulation for SBS suppression improvement. The optical transmitter's SNR is further improved by cancelling a beat between SBS suppression modulation tone and out of band distortion spectrum of information bearing RF signal.
    Type: Grant
    Filed: March 21, 2016
    Date of Patent: May 15, 2018
    Assignee: ARRIS Enterprises LLC
    Inventors: Jun Wang, Venkatesh G. Mutalik, Marcel F. Schemmann, Shamsuddin H. Chasmawala
  • Patent number: 9923641
    Abstract: An optical receiver (20) includes an electrical signal generation unit (200), a first phase compensation unit (101), a distortion compensation unit (102), and a first dispersion compensation unit (400). The electrical signal generation unit (200) generates an electrical signal on the basis of received signal light. The first phase compensation unit (101) performs a phase rotation compensation process on the electrical signal generated by the electrical signal generation unit (200). The distortion compensation unit (102) performs a dispersion compensation process and a phase rotation compensation process in this order, at least once, on the electrical signal after having compensation performed thereon by the first phase compensation unit. The electrical signal generation unit (200), the first phase compensation unit (101), and the distortion compensation unit (102) are incorporated into one semiconductor device.
    Type: Grant
    Filed: September 19, 2013
    Date of Patent: March 20, 2018
    Assignee: NEC CORPORATION
    Inventors: Wakako Yasuda, Junichi Abe, Daisaku Ogasahara
  • Patent number: 9923598
    Abstract: Under one aspect, a method is provided for processing a received signal, the received signal including a desired signal and an interference signal that spectrally overlaps the desired signal. The method can include obtaining an amplitude of the received signal. The method also can include obtaining an average amplitude of the received signal based on at least one prior amplitude of the received signal. The method also can include subtracting the amplitude from the average amplitude to obtain an amplitude residual. The method also can include, based upon an absolute value of the amplitude residual being less than or equal to a first threshold, inputting the received signal into an interference suppression algorithm so as to generate a first output including the desired signal with reduced contribution from the interference signal.
    Type: Grant
    Filed: March 16, 2017
    Date of Patent: March 20, 2018
    Assignee: The Aerospace Corporation
    Inventors: Philip Dafesh, Phillip Brian Hess
  • Patent number: 9887735
    Abstract: In a network terminal (ONU) of an optical network near end crosstalk (NEC) is compensated by a digital generated cancellation signal. To establish a connection with another terminal (OLT) signals avoiding NEC are transmitted and the compensation is performed while the power of the transmitted signal is increased in steps.
    Type: Grant
    Filed: November 20, 2015
    Date of Patent: February 6, 2018
    Assignee: Xieon Networks S.a.r.l.
    Inventor: Thomas Treyer
  • Patent number: 9838140
    Abstract: A transceiver for fiber optic communications.
    Type: Grant
    Filed: May 16, 2017
    Date of Patent: December 5, 2017
    Assignee: INPHI CORPORATION
    Inventors: Diego Ernesto Crivelli, Mario Rafael Hueda, Hugo Santiago Carrer, Jeffrey Zachan, Vadim Gutnik, Martin Ignacio del Barco, Ramiro Rogelio Lopez, Shih Cheng Wang, Geoffrey O. Hatcher, Jorge Manuel Finochietto, Michael Yeo, Andre Chartrand, Norman L. Swenson, Paul Voois, Oscar Ernesto Agazzi