Including Synchronization Patents (Class 398/154)
  • Patent number: 10389472
    Abstract: An optical line terminal (OLT) coupled to a plurality of optical network units (ONUs) through a passive optical network (PON). The OLT includes a transceiver configured to communicate via a management channel of a communication network with a plurality of OLTs. The communication includes sending or receiving a notification, wherein the notification includes the following: a source OLT identifier associated with a source OLT sending the notification, wherein the source OLT is configured to communicate over a first channel at a first wavelength of the PON; a destination OLT identifier associated with a destination OLT receiving the notification, wherein the destination OLT is configured to communicate over a second channel at a second wavelength of the PON; and an ONU identifier associated with a first ONU associated with the notification.
    Type: Grant
    Filed: April 3, 2018
    Date of Patent: August 20, 2019
    Assignee: Futurewei Technologies, Inc.
    Inventors: Yuanqiu Luo, Bo Gao, Frank Effenberger
  • Patent number: 10268056
    Abstract: An optical modulator comprises a silicon substrate, a buried oxide (BOX) layer disposed on top of the silicon substrate, and a ridge waveguide disposed on top of the BOX layer and comprising a first n-type silicon (n-Si) slab, a first gate oxide layer coupled to the first n-Si slab, a first p-type silicon (p-Si) slab coupled to the first gate oxide layer, and a light propagation path that travels sequentially through the first n-Si slab, the first gate oxide layer, and the first p-Si slab.
    Type: Grant
    Filed: June 1, 2017
    Date of Patent: April 23, 2019
    Assignee: Futurewei Technologies, Inc.
    Inventors: Dawei Zheng, Hongbing Lei, Qianfan Xu, Xiao Shen, Yu Sheng Bai
  • Patent number: 10230493
    Abstract: A method for performing code block segmentation for wireless transmission using concatenated forward error correction encoding includes receiving a transport block of data for transmission having a transport block size, along with one or more parameters that define a target code rate. A number N of inner code blocks needed to transmit the transport block is determined. A number M—outer code blocks may be calculated based on the number of inner code blocks and on encoding parameters for the outer code blocks. The transport block may then be segmented and encoded according to the calculated encoding parameters.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: March 12, 2019
    Assignee: TEXAS INSTRUMENTS INCORPORATED
    Inventors: June Chul Roh, Pierre Bertrand
  • Patent number: 10200722
    Abstract: A device and method for collecting data from an event and retransmitting same with high value portions of the data identified. Low value portions of the data from the event are identified so, if desired, they may be removed and replaced by other data, such as stats from the event, stats from other events, and trivia relevant to the event. Indications alert end users that the data signal is returning to high value portions.
    Type: Grant
    Filed: December 17, 2013
    Date of Patent: February 5, 2019
    Assignee: SKYCAM, LLC
    Inventors: Nic Salomon, Stephen Wharton
  • Patent number: 10175779
    Abstract: In one example implementation according to aspects of the present disclosure, a method may include detecting, by a computing system, a touch input on the computing system by analyzing a change in a data stream from a sensor of the computing system by applying a first signal de-noising algorithm to the data stream. The method may further include determining, by the computing system, the nature of the detected touch input. Additionally, the method may include generating, by the computing system, a discrete cursor movement from a set of discrete cursor movements based on the determined nature of the detected touch input.
    Type: Grant
    Filed: May 28, 2014
    Date of Patent: January 8, 2019
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Oleg Vassilievich Nikolsky, Kas Kasravi
  • Patent number: 10157091
    Abstract: A method of tracking repeated performance problems in a machine is disclosed. The method comprises storing the faults in a computer memory, and assigning a classification value to the machine based on the frequency and number of the faults. Based on the classification value of the cash handing device it is determined whether the cash handing device needs to be serviced. The faults can be related to one of the hardware, the cash reject rate, image handling, crash rate, user claim rate, and check handling accuracy of the machine.
    Type: Grant
    Filed: February 18, 2016
    Date of Patent: December 18, 2018
    Assignee: Bank of America Corporation
    Inventors: Cheryl S. Bond, Rebecca L. Bell, Dion L. Bellamy, Pat Burton, Kristy M. Crist, Carol Giordano, James D. Goodwin, Jeffrey Hipple, Maggie M. Peretto, Devin D. Rhodes, Karen Y. Stavinoha, Susan A. Wilson
  • Patent number: 10146603
    Abstract: A method of tracking repeated performance problems in a machine is disclosed. The method comprises storing the faults in a computer memory, and assigning a classification value to the machine based on the frequency and number of the faults. Based on the classification value of the cash handing device it is determined whether the cash handing device needs to be serviced. The faults can be related to one of the hardware, the cash reject rate, image handling, crash rate, user claim rate, and check handling accuracy of the machine.
    Type: Grant
    Filed: February 18, 2016
    Date of Patent: December 4, 2018
    Assignee: Bank of America Corporation
    Inventors: Cheryl S. Bond, Rebecca L. Bell, Dion L. Bellamy, Pat Burton, Kristy M. Crist, Carol Giordano, James D. Goodwin, Jeffrey Hipple, Maggie M. Peretto, Devin D. Rhodes, Karen Y. Stavinoha, Susan A. Wilson
  • Patent number: 10148284
    Abstract: The present disclosure describes a wired communication device having media access control (MAC) circuitry and physical layer (PHY) circuitry. The MAC circuitry frames one or more data packets in accordance with a wired communication standard or protocol to provide one or more data frames. The one or more data frames include one or more packets that are separated by interpacket gaps (IPGs). The MAC circuitry selectively choses a duration of the IPGs to maintain an average IPG duration. The PHY circuitry encodes the one or more data frames in accordance with a line coding scheme that is efficiently represents different possible combinations for types of characters present in the one or more data frames.
    Type: Grant
    Filed: June 22, 2016
    Date of Patent: December 4, 2018
    Assignee: Avago Technologies International Sales Pte. Limited
    Inventors: Ankit Sajjan Kumar Bansal, Eric A. Baden
  • Patent number: 10057672
    Abstract: One example discloses an optical communication interface for a handheld device: wherein the handheld device, has an external surface; wherein the external surface includes an interior facing side and an exterior facing side; a first optical receiver, on the interior facing side of the handheld device, having an optical input and an electrical output; wherein the electrical output is coupled to circuitry; and wherein the optical input is configured to be optically coupled to a second optical transmitter on the exterior facing side of the handheld device.
    Type: Grant
    Filed: October 4, 2016
    Date of Patent: August 21, 2018
    Assignee: NXP B.V.
    Inventor: Steven Mark Thoen
  • Patent number: 10033478
    Abstract: Methods, systems, and devices are disclosed for using optical modes in optical waveguides to carry different optical communication signals. In one aspect, an optical device for optical MDM in optical communications includes an optical waveguide configured to support multiple optical waveguide modes and to carry light of different optical communication channels in different optical waveguide modes, respectively, of the multiple optical waveguide modes. The optical device includes an optical resonator configured to be capable of carrying an optical communication channel in one optical resonator mode and optically coupled to the optical waveguide to selectively couple the optical communication channel in the optical resonator into the optical waveguide to add a channel into the optical waveguide via optical mode division multiplexing. In another aspect, an optical mode division demultiplexing can be performed by coupling an optical waveguide and an optical resonator.
    Type: Grant
    Filed: June 12, 2013
    Date of Patent: July 24, 2018
    Assignee: Cornell University
    Inventors: Michal Lipson, Lian-Wee Luo, Lucas Heitzmann Gabrielli
  • Patent number: 10003406
    Abstract: An optical level control apparatus includes an input port, an output port, an optical device to assume a state of outputting light inputted to the input port from the output port and a state of not outputting the light inputted to the input port from the output port; a detector to detect an intensity of the light inputted to the input port, and a control unit to detect an input of an optical burst signal to the input port on the basis of a result of detecting the intensity of the light and to control the optical device so that the signal, in which to eliminate a field extending up to an elapse of a period of first time equal to or shorter than laser ON time period of the signal from a head of the signal with its input being detected, is output from the output port.
    Type: Grant
    Filed: September 30, 2014
    Date of Patent: June 19, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Setsuo Yoshida, Keisuke Harada
  • Patent number: 9997066
    Abstract: In an optical fiber network for transmitting optical signals in a robot having three or more joints connecting a plurality of links in series such that the links include two end links located at either end and intermediate links provided between the two end links, and the links connected by the joints are moveable relative to each other, a plurality of optical transceiver modules are provided on the links such that at least one optical transceiver module is provided on each link; and a plurality of optical fiber cables connect the optical transceiver modules in a ring; wherein at least one end of each optical fiber cable connecting the optical transceiver modules provided on different links is connected to one of the optical transceiver modules provided on the intermediate links.
    Type: Grant
    Filed: April 21, 2017
    Date of Patent: June 12, 2018
    Assignee: Honda Motor Co., Ltd.
    Inventors: Ryusuke Ishizaki, Shingo Iwasaki
  • Patent number: 9954617
    Abstract: An OLT (1) is formed by N optical transceivers (11), one PON control circuit (12), and one selection and distribution circuit (13). An optical transceiver selection control signal (SC) is transferred from the PON control circuit (12) to the selection and distribution circuit (13). The optical transceiver selection control signal (SC) indicates the timing of a discovery window, the timing of a grant, and a logical link identification number of a registered ONU assigned to the grant (a logical link identification number for a logical link with the registered ONU). The selection and distribution circuit (13) selects one optical transceiver (11-s (s is an integer falling within a range of 0 to N?1)) from the optical transceivers (11-0 to 11-N?1) based on the optical transceiver selection control signal (SC) from the PON control circuit (12).
    Type: Grant
    Filed: August 19, 2015
    Date of Patent: April 24, 2018
    Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATION
    Inventors: Kenji Kawai, Yuki Arikawa, Tomoaki Kawamura, Nobuyuki Tanaka, Satoshi Shigematsu, Naoki Miura
  • Patent number: 9893807
    Abstract: A method of providing data using visible light communication (VLC) and a VLC system therefor is provided, the method for easy utilization, in a user terminal, of information provided by a lighting apparatus based on a position at which the lighting apparatus is provided.
    Type: Grant
    Filed: February 3, 2015
    Date of Patent: February 13, 2018
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jong Woo Choi, Jung Sik Sung, Seong Hee Park, Hyun Chul Kang, Hyun Joo Kang, Tae Gyu Kang
  • Patent number: 9871648
    Abstract: A method distributes clock synchronization information within an optical communications network that includes a plurality of network elements. The method receives an ingress clock synchronization message at a first network element. The ingress clock synchronization message includes a clock synchronization message identifier and a correction field. The clock synchronization message identifier is inserted into an optical channel frame overhead and the ingress clock synchronization message is inserted into an optical channel frame payload. The optical channel frame overhead and the optical channel frame payload are transmitted across the first network element, across the network to a second network element, and across the second network element. A transit time of the clock synchronization message identifier is determined across each of the network elements.
    Type: Grant
    Filed: March 3, 2017
    Date of Patent: January 16, 2018
    Assignee: TELEFONAKTIEBOLAGET LM ERICSSON (PUBL)
    Inventors: Sergio Lanzone, Stefano Ruffini, Orazio Toscano
  • Patent number: 9712352
    Abstract: A high-speed multi-channel data transmission method is disclosed. The method includes that: a data sender replaces data at intervals of N periods with frame headers in data channels, sequentially stores the data replaced with the frame headers in the data channels in a Deskew channel, and sends the data in the data channels and data in the Deskew channel to a data receiver; the data receiver determines frame header locations of the data channels and the Deskew channel, calculates offsets of the data channels according to the frame header locations, and performs period compensation for the data channels according to the calculated offsets to keep the frame header of each data channel and the frame header of the Deskew channel in a relative relationship the same as that at the data sender; and the frame headers on the data channels and the corresponding data on the Deskew channel are replaced to finish data restoration.
    Type: Grant
    Filed: August 22, 2013
    Date of Patent: July 18, 2017
    Assignee: ZTE Corporation
    Inventors: Chao Cai, Tao Feng
  • Patent number: 9628259
    Abstract: A method distributes clock synchronization information within an optical communications network having a plurality of network elements. The method receives an ingress clock synchronization message at a first network element. The ingress clock synchronization message includes a clock synchronization message identifier and a correction field. The clock synchronization message identifier is inserted into an optical channel frame overhead and the ingress clock synchronization message is inserted into an optical channel frame payload. The optical channel frame overhead and the optical channel frame payload are transmitted across the first network element, across the network to a second network element, and across the second network element. A transit time of the clock synchronization message identifier is determined across each of the network elements.
    Type: Grant
    Filed: August 17, 2012
    Date of Patent: April 18, 2017
    Assignee: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Sergio Lanzone, Stefano Ruffini, Orazio Toscano
  • Patent number: 9602220
    Abstract: The disclosure concerns quantum repeater network system that does not need any matter qubit. According to the quantum repeater network system for performing quantum communication between one transmitter/receiver and the other transmitter/receiver via transmission repeaters and reception repeaters, each of the transmission repeaters prepares quantum systems in an irreducibly entangled state, each of the quantum systems being associated with a reception repeater as a transmission destination, and transmits, to the associated reception repeater, each of the quantum systems in the irreducibly entangled state together with a quantum system entangled with the quantum system.
    Type: Grant
    Filed: June 11, 2014
    Date of Patent: March 21, 2017
    Assignees: Nippon Telegraph and Telephone Corporation, The Governing Council of the University of Toronto
    Inventors: Koji Azuma, Kiyoshi Tamaki, Hoi-Kwong Lo
  • Patent number: 9571191
    Abstract: An information communication method of transmitting a signal using a change in luminance is provided. The information communication method includes: determining a pattern of the change in luminance, by modulating the signal to be transmitted; and transmitting the signal, by at least one light emitter changing in luminance according to the determined pattern of the change in luminance. In the determining, a first luminance change pattern corresponding to a body, a second luminance change pattern indicating a header for specifying the body, and a third luminance change pattern indicating another header different from the header are determined. In the transmitting, the header, the body and the other header are transmitted by the at least one light emitter changing in luminance according to the first luminance change pattern, the second luminance change pattern, the first luminance change pattern and the first luminance change pattern in the stated order.
    Type: Grant
    Filed: August 11, 2016
    Date of Patent: February 14, 2017
    Assignee: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
    Inventors: Mitsuaki Oshima, Koji Nakanishi, Hideki Aoyama, Ikuo Fuchigami, Hidehiko Shin, Tsutomu Mukai, Yosuke Matsushita, Shigehiro Iida, Kazunori Yamada
  • Patent number: 9485083
    Abstract: A method and apparatus for time synchronization between a plurality of nodes in a network. The apparatus distinguishes between an optical synchronization signal for synchronization between nodes and an optical data signal for data transmission, and synchronizes nodes with each other using the optical synchronization signal.
    Type: Grant
    Filed: November 20, 2014
    Date of Patent: November 1, 2016
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTIT
    Inventors: Jinsoo Han, Chang Sic Choi, Wan Ki Park, Il Woo Lee
  • Patent number: 9467225
    Abstract: An information communication method of transmitting a signal using a change in luminance is provided. The information communication method includes: determining a pattern of the change in luminance, by modulating the signal to be transmitted; and transmitting the signal, by at least one light emitter changing in luminance according to the determined pattern of the change in luminance. In the determining, a first luminance change pattern corresponding to a body which is a part of the signal and a second luminance change pattern indicating a header for specifying the body are determined. In the transmitting, the header and the body are transmitted by the at least one light emitter changing in luminance according to the first luminance change pattern, the second luminance change pattern, and the first luminance change pattern in the stated order.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: October 11, 2016
    Assignee: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA
    Inventors: Mitsuaki Oshima, Koji Nakanishi, Hideki Aoyama, Ikuo Fuchigami, Hidehiko Shin, Tsutomu Mukai, Yosuke Matsushita, Shigehiro Iida, Kazunori Yamada
  • Patent number: 9444710
    Abstract: An apparatus and method for scalable frame alignment in a high data-rate communications system. OTUk/ODUk frame alignment uses serial processing of a match vector, or serial processing of received OTUk/ODUk bytes to reduce the footprint occupied by the processing logic.
    Type: Grant
    Filed: November 21, 2013
    Date of Patent: September 13, 2016
    Assignee: Microsemi Storage Solutions (U.S.), Inc.
    Inventor: Victor Gusev Lesau
  • Patent number: 9344780
    Abstract: There is provided a communication control device including a communication control processing portion that performs at least one type of communication control processing when a control signal that requests a response signal is received from a partner device, a transmission processing portion that transmits the response signal to the partner device after the processing that the communication control processing portion performs when the control signal is received from the partner device, a processing time measurement portion that measures time that is consumed by the processing by the communication control processing portion, and a processing content setting portion that, based on the measured processing time that has been measured by the processing time measurement portion and on a response processing time for the response to the control signal, sets content of processing that the communication control processing portion will be made to perform within the response processing time.
    Type: Grant
    Filed: May 15, 2014
    Date of Patent: May 17, 2016
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Takayuki Nishikawa
  • Patent number: 9313562
    Abstract: An apparatus includes a bank of optical detectors, an input optical filter and a selector. The optical detectors are configured to output respective detection indications in response to detecting a presence of an optical signal. The input optical filter is configured to receive an input optical signal having an input wavelength, and to route the input optical signal to one of the optical detectors in the bank depending on the input wavelength. The selector is configured to select an output wavelength based on the detection indications of the optical detectors, and to cause generation and transmission of an output optical signal at the selected output wavelength.
    Type: Grant
    Filed: August 4, 2013
    Date of Patent: April 12, 2016
    Assignee: MELLANOX TECHNOLOGIES LTD.
    Inventors: Eyal Waldman, Shai Cohen, Evelyn Landman, Benny Koren, Shmuel Levy
  • Patent number: 9270820
    Abstract: A method and apparatus are provided for presenting multimedia content to a caller and/or a called party in association with a telephone call. Content may be presented pre-ring (before the called party's telephone rings), in-call, and/or post-call. Content presented to a party may be related to another party participating in the call or may be related to a third party (e.g., an advertiser that paid for the ability to have its content presented). Presented content may be actuable, to allow a caller to change the destination of a call, take advantage of an offer presented to him or her, redeem a coupon, schedule or queue a subsequent call, etc. To find a desired destination party, a caller may initiate a manual or automatic search of his or her local contacts (on his telephone) and/or a central or global directory or contact list.
    Type: Grant
    Filed: July 9, 2014
    Date of Patent: February 23, 2016
    Inventor: Wendell D. Brown
  • Patent number: 9209906
    Abstract: The present invention discloses a clock recovery circuit, an optical receiver, and a passive optical network device. In the clock recovery circuit provided by the embodiment of the present invention, a first signal indicating whether a data loss abnormality occurs in initial serial data is introduced at a side of a phase detector, and a phase adjustment control signal is output to a phase adjustor according to a state of the first signal; and the phase adjustor performs different types of phase adjustment according to a state of the initial serial data, so that a data sampler can recover an accurate clock when the initial serial data is normal and can implement smooth switching of output clock information in special cases such as initial serial data clock loss or recovery, and no great abrupt phase change occurs, thereby ensuring stable and reliable working of a system.
    Type: Grant
    Filed: May 22, 2014
    Date of Patent: December 8, 2015
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Deqiang Chen
  • Patent number: 9129578
    Abstract: The display device according to the present invention comprises a substrate and at least one optical coupler having an optical receiver and an optical transmitter formed on the substrate, wherein the optical transmitter transmits an optical signal to the optical receiver.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: September 8, 2015
    Assignees: Innocom Technology (Shenzhen) Co., Ltd., Innolux Corporation
    Inventors: Keitaro Yamashita, Te-Yu Lee
  • Patent number: 9112615
    Abstract: Methods, systems, and devices are described for detecting and correcting a cycle slip occurrence in a coherent receiver. Unique words are used in each received frame to detect phase changes that indicate the occurrence of a cycle slip within a frame. The location of the cycle slip is identified based on measurements made within the frame. Those measurements include phase estimation measurements and reliability measurements. A phase of a portion of the frame subsequent to the identified location of the cycle slip is adjusted to correct for the cycle slip. By combining phase estimates of symbols from both vertical and horizontal polarizations, the location of the cycle slip may be more accurately determined because the measurement windows is less susceptible to thermal noise. The phase estimates are combined by adjusting a phase of the symbols of one polarization to match a phase of the symbols of the other polarization.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: August 18, 2015
    Assignee: ViaSat, Inc.
    Inventors: William Thesling, Fan Mo, Yuri Zelensky
  • Patent number: 9054811
    Abstract: The present invention relates to the Passive Optical Network (PON) technology, and a method for sending an upstream transfer frame in a PON is provided. The method includes: after success of link, sending a preamble according to an allocated time slot, sending a burst synchronization delimiter, and then sending successively a burst header, a Gigabit-Capable Passive Optical Network (GPON) Transmission Convergence (GTC) frame header, and GTC frame data. In the sent synchronization delimiter, the number of zeros on the odd bits is N, the number of non-zeros on the odd bits is M, a relation |N?M|?1 is satisfied, the max number of zeros in a continuous zero group is X, the max number of non-zeros in a continuous nonzero group is Y, and a relation |X?Y|?1 is satisfied. A device for sending an upstream transfer frame in a passive optical network is further provided.
    Type: Grant
    Filed: August 2, 2012
    Date of Patent: June 9, 2015
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Dongning Feng, Dongyu Geng, Jing Li, Wai Kong Raymond Leung, Frank Effenberger
  • Patent number: 9042737
    Abstract: In the present invention, wasted power consumption caused when a clock and data recovery unit in an optical network unit in a PON system is activated from a power-saving state is reduced and rapid, secure communication is performed. A clock and data recovery unit includes a phase-locked loop that can be set to normal mode or power-saving mode and that includes a voltage-controlled oscillator and recovers a clock signal and a data signal from input signals. The clock and data recovery unit includes a reference clock multiplier circuit that multiplies a reference clock signal and outputs the multiplied reference clock signal; and a frequency training loop that includes the same voltage-controlled oscillator and performs synchronous oscillation training by the voltage-controlled oscillator using the reference clock multiplier circuit before the phase-locked loop transitions from power-saving mode to normal mode.
    Type: Grant
    Filed: February 21, 2012
    Date of Patent: May 26, 2015
    Assignee: SUMITOMO ELECTRIC INDUSTRIES, LTD.
    Inventor: Naruto Tanaka
  • Publication number: 20150139664
    Abstract: A method and apparatus for time synchronization between a plurality of nodes in a network. The apparatus distinguishes between an optical synchronization signal for synchronization between nodes and an optical data signal for data transmission, and synchronizes nodes with each other using the optical synchronization signal.
    Type: Application
    Filed: November 20, 2014
    Publication date: May 21, 2015
    Inventors: JINSOO HAN, CHANG SIC CHOI, WAN KI PARK, IL WOO LEE
  • Publication number: 20150139663
    Abstract: A method distributes clock synchronization information within an optical communications network having a plurality of network elements. The method receives an ingress clock synchronization message at a first said network element. The ingress clock synchronization message includes a clock synchronisation message identifier and a correction field. The clock synchronisation message identifier is inserted into an optical channel frame overhead and the ingress clock synchronisation message is inserted into an optical channel frame payload. The optical channel frame overhead and the optical channel frame payload are transmitted across the first network element, across the network to a second said network element, and across the second network element. A transit time of the clock synchronisation message identifier is determined across each of the network elements.
    Type: Application
    Filed: August 17, 2012
    Publication date: May 21, 2015
    Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Sergio Lanzone, Stefano Ruffini, Orazio Toscano
  • Patent number: 9036997
    Abstract: A transmitter and a receiver for an optical telecommunication system of the WDM type are disclosed. In one aspect, the transmitter uses a chromato-temporal encoder which, with each block of symbols to be transmitted, associates a code matrix, where each element of the matrix corresponds to a wavelength and a use of the channel. The transmitter includes multiple modulators, where each modulator modulates a laser beam at a wavelength during a use of the channel by an element corresponding to the code matrix. The beams modulated in this manner are multiplexed in an optical fiber. Another embodiment using both a wavelength and a polarization encoding is also proposed.
    Type: Grant
    Filed: October 7, 2011
    Date of Patent: May 19, 2015
    Assignee: Institut Mines—Telecom
    Inventors: Ghaya Rekaya-Ben Othman, Yves Jaouen, Bruno Thedrez, Sami Mumtaz
  • Publication number: 20150132012
    Abstract: A transmission apparatus includes: a plurality of logical lanes; a receiver configured to receive a signal including synchronization information of a frame; a distributor configured to divide data included in the received signal into frame elements and cause the plurality of logical lanes to store the data; and a transmitter configured to transmit the data stored in the logical lanes to lines corresponding to the logical lanes. When the data is stored in the plurality of logical lanes, the distributor groups the logical lanes into a plurality of groups and associates the frame elements with the synchronization information.
    Type: Application
    Filed: January 12, 2015
    Publication date: May 14, 2015
    Inventors: Hayato Furukawa, Wataru Odashima, Shota Shinohara, Toru Katagiri
  • Patent number: 9031415
    Abstract: An Ethernet adapter system may include a transmitter to insert a payload type identifier sequence in a generic frame procedure header to indicate that a network is a converged enhanced Ethernet network. The transmitter may insert idle sequences in a stream of data frames transmitted along a link. The system may include a receiver to recognize a condition and to force a loss of synchronization condition on the link that will be converted by the receiver into a loss of light condition. The receiver may scan the transmitted stream of data frames for invalid data frames and introduce a code into the stream of data frames whenever an invalid data frame is detected.
    Type: Grant
    Filed: December 8, 2012
    Date of Patent: May 12, 2015
    Assignee: International Business Machines Corporation
    Inventors: Casimer M. DeCusatis, Thomas A. Gregg, Rajaram B. Krishnamurthy
  • Patent number: 9025965
    Abstract: Disclosed are a phase locked loop (PLL) of a digital scheme and a method thereof. More specifically, disclosed are a digital phase locked loop having a time-to-digital converter (TDC), a digital loop filter (DLF), and a digitally controlled oscillator (DCO), and that is designed to have a constant jitter characteristic at all times even though an operating condition of a circuit varies according to a process, voltage, temperature (PVT) change, and a method thereof.
    Type: Grant
    Filed: December 22, 2011
    Date of Patent: May 5, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Seung Woo Lee, Kwang Chun Choi, Woo Young Choi, Bhum Cheol Lee
  • Patent number: 9025964
    Abstract: An OLT that receives a signal in which transmission signals having a plurality of transmission rates are time-division multiplexed, as a received signal, and performs data reproduction by selecting reproduction data to be reproduced, among oversampled signals obtained by oversampling the received signal. The OLT includes a data-signal-information acquisition unit that acquires a transmission rate of a received signal targeted for a process of the data reproduction, a sampling frequency control unit that determines a sampling frequency to be used for the oversampling based on the transmission rate, and a sampling-clock generation unit that generates a clock signal having the sampling frequency determined by the sampling-frequency control unit, and performs the oversampling based on the clock signal.
    Type: Grant
    Filed: June 4, 2010
    Date of Patent: May 5, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventor: Takeshi Suehiro
  • Patent number: 9020341
    Abstract: An optical transmission system includes at least a first optical link to transmit a first data signal as a part of a multi-lane signal and a second optical link to transmit a second data signal as another part of the multi-lane signal; on the transmission side, a reference clock is constantly applied to the first data signal of the first optical link, and a delay clock is applied to the second data signal responsive to a control signal on the second optical link; on the receiving side, the phase of a first clock signal detected from the first data signal received on the first optical link and the phase of a second clock signal detected from the second data signal received on the second optical link are compared, and the control signal is detected from the comparison result.
    Type: Grant
    Filed: January 4, 2013
    Date of Patent: April 28, 2015
    Assignee: Fujitsu Limited
    Inventor: Tsuyoshi Yamamoto
  • Patent number: 9002195
    Abstract: In an optical communication system containing a primary line and backup line card, a method includes providing interfaces for the primary and backup line card, each line card including a transmitter and receiver; and selecting output from the transmitter from either the primary or back up line card including selecting the backup line card when the primary line card encounters a failure.
    Type: Grant
    Filed: September 27, 2012
    Date of Patent: April 7, 2015
    Assignee: NEC Laboratories America, Inc.
    Inventors: Junqiang Hu, Philip Nan Ji, Ting Wang, Yoshiaki Aono
  • Patent number: 9002212
    Abstract: Provided is an optical line terminator (OLT) to recover packet data and a clock from an optical signal including a silent interval. The OLT may receive packet data and a clock from at least one optical network unit (ONU). Even in a silent interval in which the at least one ONU does not transmit packet data, the OLT may successfully recover the clock.
    Type: Grant
    Filed: August 19, 2011
    Date of Patent: April 7, 2015
    Assignee: Intellectual Discovery Co., Ltd.
    Inventors: Mun Seob Lee, Dong Soo Lee, Geun Yong Kim, Hark Yoo, Young Suk Lee, Sung Chang Kim, Jai Sang Koh, Jong Deog Kim
  • Patent number: 8989582
    Abstract: A timing interface module installs within a rack to increase bandwidth. The timing interface module receives a reference timing signal and outputs the reference timing signal to an optical multiplexer. The optical multiplexer also receives multiple data streams of different formats, and the optical multiplexer synchronizes the multiple data streams to the reference timing signal.
    Type: Grant
    Filed: June 22, 2012
    Date of Patent: March 24, 2015
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Stephen H. Culpepper, Jack Martin, Jr.
  • Publication number: 20150063825
    Abstract: The present invention includes optical phase modulation circuits (26A, 26B) as one and another transmission processing devices that transmit a plurality of pieces of data in a phase-synchronous manner, and one and another synchronization drive means (33A, 33B) for synchronously control transmission operations of the optical phase modulation circuits.
    Type: Application
    Filed: April 6, 2012
    Publication date: March 5, 2015
    Applicant: NEC CORPORATION
    Inventor: Tomoyuki Yamase
  • Patent number: 8971703
    Abstract: A wavelength dispersion amount estimation method, a wavelength dispersion compensation circuit, and a receiving device which rapidly estimate and set a wavelength dispersion amount to compensate with high accuracy at the receiving device which compensates waveform distortion at an optical fiber transmission path.
    Type: Grant
    Filed: February 1, 2012
    Date of Patent: March 3, 2015
    Assignee: Nippon Telegraph and Telephone Corporation
    Inventors: Etsushi Yamazaki, Takayuki Kobayashi, Masahito Tomizawa, Riichi Kudo, Koichi Ishihara, Tadao Nakagawa, Mitsuteru Ishikawa
  • Patent number: 8964722
    Abstract: A method for synchronizing a plurality of clocks arranged within a plurality of nodes of a packet-switching network comprises comparing parameters that relate to the plurality of clocks in order to determine master-slave relationships between the plurality of clocks, and exchanging time-stamped messages over the packet-switching network each time between a master clock and an associated slave clock to make the associated slave clock subservient to the master clock. A node of the packet-switching network comprises a frequency source controlled by a synchronous physical layer technology. The parameters that relate to a clock of the node comprise a parameter that relates to the frequency source to determine the master slave relationships based on one property of the frequency source.
    Type: Grant
    Filed: December 7, 2009
    Date of Patent: February 24, 2015
    Assignee: Alcatel Lucant
    Inventors: Michel Le Pallec, Dinh Thai Bui
  • Patent number: 8953948
    Abstract: The present disclosure provides to Optical Transport Network (OTN_ synchronization systems and methods that maintain proper sequential ordering of events at nodes which may be utilized in performing root cause analysis or diagnosing network performance. In an exemplary embodiment, the systems and methods utilize functionality incorporated into OTN providing a cost effective and standards-based approach to nodal synchronization. Once synchronized, network events are logged with an appropriate timestamp enabling a determination of a sequential order of network events can be determined. Further, the node timestamps may be synchronized, with microsecond or even sub-microsecond of precession which is critical in diagnosing network failures or slow traffic recovery.
    Type: Grant
    Filed: November 22, 2011
    Date of Patent: February 10, 2015
    Assignee: Ciena Corporation
    Inventors: Hongxing Meng, Abhishek Chaudhary, Gustav Karl Larsson, Saravanan Purushothaman
  • Patent number: 8948595
    Abstract: An optical line terminal includes the transmission rate control table for storing a minimum bandwidth for an emergency status for each of optical network units in addition to a maximum assigned bandwidth in a normal status. When a decrease in a supply power is detected, the optical line terminal calculates a transmission clock rate providing a minimum bandwidth required by each optical network unit with reference to the transmission rate control table. The optical line terminal determines change timing of downstream and upstream transmission clock rates, and change timing of upstream data for time-division multiplexing to instruct each of the optical network units. Both the optical line terminal and the optical network unit change the transmission clock rates with substantial synchronization therebetween.
    Type: Grant
    Filed: November 23, 2012
    Date of Patent: February 3, 2015
    Assignee: Hitachi, Ltd.
    Inventors: Tohru Kazawa, Toyomi Teramoto, Makoto Matsuoka
  • Patent number: 8942764
    Abstract: Systems and methods are provided for a media device including one or more movement-based interfaces for interfacing with or controlling the media device.
    Type: Grant
    Filed: October 1, 2007
    Date of Patent: January 27, 2015
    Assignee: Apple Inc.
    Inventors: Michael Culbert, Scott Forstall, Nicholas V. King, Michael M. Lee
  • Patent number: 8942561
    Abstract: One embodiment provides an Ethernet Passive Optical Network (EPON) system for clock transport. The system includes a reference clock configured to generate a frequency-reference signal, an optical line terminal (OLT) coupled to the reference clock, and an optical network unit (ONU). The OLT includes a clock generator configured to generate an OLT clock based on at least the frequency-reference signal. The ONU includes an optical transceiver, a clock recovery module, and a clock output mechanism. The optical transceiver is configured to transmit optical signals to and receive optical signals from the OLT. The clock-recovery module is configured to recover the frequency-reference signal from the received optical signals. The clock output mechanism is configured to output the recovered frequency-reference signal, thus facilitating transport of the frequency-reference signal over the EPON.
    Type: Grant
    Filed: October 6, 2009
    Date of Patent: January 27, 2015
    Assignee: Broadcom Corporation
    Inventors: Edward W. Boyd, Hidehiko Shibuya
  • Patent number: 8934780
    Abstract: Techniques for timing synchronization in an optical orthogonal frequency division multiplexing (OOFDM) system includes providing a time-domain training symbol having a symmetric distribution and producing the training symbol by transmitting a real-valued PN sequence on each subcarrier under the OOFDM. The training sequence includes an initial value, followed by an odd length palindromic sequence of values.
    Type: Grant
    Filed: December 10, 2012
    Date of Patent: January 13, 2015
    Assignee: ZTE (USA) Inc.
    Inventor: Jianjun Yu
  • Patent number: 8934783
    Abstract: An Ethernet adapter system may include a transmitter to insert a payload type identifier sequence in a generic frame procedure header to indicate that a network is a converged enhanced Ethernet network. The transmitter may insert idle sequences in a stream of data frames transmitted along a link. The system may include a receiver to recognize a condition and to force a loss of synchronization condition on the link that will be converted by the receiver into a loss of light condition. The receiver may scan the transmitted stream of data frames for invalid data frames and introduce a code into the stream of data frames whenever an invalid data frame is detected.
    Type: Grant
    Filed: February 17, 2011
    Date of Patent: January 13, 2015
    Assignee: International Business Machines Corporation
    Inventors: Casimer M. DeCusatis, Thomas A. Gregg, Rajaram B. Krishnamurthy