Time Division Patents (Class 398/98)
  • Patent number: 10404400
    Abstract: An optical WDM system configured to use direct detection of communication signals that is compatible with electronic CD compensation on a per-channel basis. In an example embodiment, to enable full (e.g., amplitude and phase) electric-field reconstruction at the receiver, the optical WDM system uses a carrier-frequency plan according to which the carrier-frequency comb used at one end of the WDM link and the carrier-frequency comb used at the other end of the WDM link are offset with respect to one another by one half of the bandwidth of an individual WDM component transmitted therethrough. This frequency offset places each local carrier frequency at a roll-off edge of the corresponding incoming data-modulated signal. As a result, the corresponding combined optical signal beneficially lends itself to direct detection that can be followed by full electric-field reconstruction using a known self-coherent Kramers-Kronig method and then by conventional electronic CD compensation.
    Type: Grant
    Filed: April 28, 2017
    Date of Patent: September 3, 2019
    Assignee: NOKIA OF AMERICA CORPORATION
    Inventors: Xi Chen, Chandrasekhar Sethumadhavan, Peter J. Winzer
  • Patent number: 10396929
    Abstract: The invention relates to an all-optical regeneration system for regeneration of optical wavelength division multiplexed WDM data signals in an optical WDM communication system. The system comprises a WDM-to-Optical time domain multiplexing OTDM, WDM-to-OTDM, converter, capable of converting an input WDM data signal comprising multiple wavelength channels into an input OTDM data signal comprising multiple time multiplexed time channels. The system further comprises an all-optical regenerator unit being configured for regenerating the input OTDM data signal into an output OTDM data signal. The system additionally comprises an OTDM-to-WDM converter for converting the output OTDM data signal to an output WDM data signal. An input of the all-optical regenerator unit is in optical communication with an output of the WDM-to-OTDM converter, and an output of the all-optical regenerator unit is in optical communication with an input of the OTDM-to-WDM converter.
    Type: Grant
    Filed: March 13, 2014
    Date of Patent: August 27, 2019
    Assignee: Danmarks Tekniske Universitet
    Inventors: Leif Katsuo Oxenløwe, Hans Christian Hansen Mulvad, Michael Galili, Zohreh Lali-Dastjerdi, Francesco Da Ros, Evarist Palushani, Christophe Peucheret, Hao Hu
  • Patent number: 10169435
    Abstract: The present invention provides a method of transferring content from a file and a database. In this case, the file includes content instances, each content instance being associated with a respective field, and each field having a respective type. The transfer is achieved by determining the type of each field, and then storing each content instance in a store in accordance with the determined field type of the associated field. Each content instance can then be transferred to the database in accordance with the determined field type. A similar procedure is provided for creating XML files based on content within the database.
    Type: Grant
    Filed: August 20, 2012
    Date of Patent: January 1, 2019
    Assignee: SEMANTIC TECHNOLOGIES PTY LTD
    Inventor: Jonathon Peter Irons
  • Patent number: 10165459
    Abstract: One or more remote radio probes (RRPs) may be installed in the fronthaul network of a cellular Radio Access Network. Each RRP may be designed as to be permanently, or semi-permanently, placed in the fronthaul network. The RRP may be designed to capture baseband radio data transmitted through the fronthaul network. The RRP may buffer and forward the captured baseband radio data to an analysis platform. The analysis platform may be a software implemented platform to perform signal and/or spectral analysis of the received baseband radio data.
    Type: Grant
    Filed: September 7, 2016
    Date of Patent: December 25, 2018
    Assignee: Verizon Patent and Licensing Inc.
    Inventors: Edward M. Jack, Said Soulhi
  • Patent number: 10085078
    Abstract: Embodiments of the present invention provide a data processing method, related device, and system for an optical transport network. The data processing method for the optical transport network includes: encapsulating service data into an optical payload unit; mapping the optical payload unit to an optical channel data unit; mapping the optical channel data unit to a payload area of an optical burst transport unit; performing electrical-optical conversion on the optical burst transport unit to form an optical burst transport unit; carrying the optical burst transport unit onto an optical timeslot of an optical burst channel; and transmitting the optical burst channel to a line. Technical solutions provided by the present invention can effectively simplify a data processing process and reduce a data processing delay.
    Type: Grant
    Filed: November 14, 2014
    Date of Patent: September 25, 2018
    Assignee: HUAWEI TECHNOLOGIES CO., LTD.
    Inventors: Ning Deng, Maarten P. J. Vissers, Xiaozhong Shi
  • Patent number: 9948569
    Abstract: A station-side terminal apparatus comprises terminal devices and a terminal device sorting unit. The terminal devices includes: a buffer unit; a subscriber-side terminal apparatus sorting unit configured to transmit a unicast packet addressed to a switch-target subscriber-side terminal apparatus to the switch queues, and transmit a packet addressed to a plurality of subscriber-side terminal apparatuses to the broadcast queue, and transmit a unicast packet addressed to a non-switch-target subscriber-side terminal apparatus to the through queue; and a scheduler unit configured to read a packet from the switch queues, the broadcast queue, and the through queue. The terminal device sorting unit is configured to transmit a received unicast packet to the terminal device, and transmit a received packet addressed to a plurality of subscriber-side terminal apparatuses, to each of the terminal devices.
    Type: Grant
    Filed: August 20, 2015
    Date of Patent: April 17, 2018
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Satoshi Furusawa
  • Patent number: 9917668
    Abstract: A method, in a network element, for detecting and propagating resizability information of an Optical channel Data Unit flex (ODUflex) connection includes receiving resizability information in overhead associated with the ODUflex connection, wherein the resizability information indicates a number of available tributary slots and whether the ODUflex connection is symmetric; and adjusting the resizability information based on a change in the available tributary slots due to a bandwidth change at the network element. The systems and methods include a solution to communicate, in real time, the resizability information of an ODUflex connection utilizing the associated data path to carry it instead of the management/control plane.
    Type: Grant
    Filed: July 25, 2014
    Date of Patent: March 13, 2018
    Assignee: Ciena Corporation
    Inventors: Kapil Juneja, Pallavi Tuli, Jatin Sareen, Waseem Reyaz Khan, Rajagopalan Kannan
  • Patent number: 9882539
    Abstract: A burst-mode TIA circuit for use in PON receivers is provided that supports multiple data rates, has high receiver sensitivity, wide dynamic range, and that performs burst-mode synchronization very quickly. The multi-rate burst-mode TIA circuit has a high-speed data path that has low input-referred noise. Based on the chosen data rate at which the multi-rate burst-mode TIA circuit will operate, the rate select switch selects an appropriate feedback resistor of the resistive feedback network.
    Type: Grant
    Filed: July 31, 2016
    Date of Patent: January 30, 2018
    Assignee: Avago Technologies General IP (Singapore) Pte. Ltd.
    Inventors: Rahul Shringarpure, Georgios Asmanis, Faouzi Chaahoub, Kartikeya Gupta
  • Patent number: 9716552
    Abstract: An OTDM coherent transceiver and related methods and apparatus that employ a pulsed source which advantageously allows higher symbol rates without requiring higher speed electronics.
    Type: Grant
    Filed: July 31, 2013
    Date of Patent: July 25, 2017
    Assignee: Acacia Communications, Inc.
    Inventor: Christopher Doerr
  • Patent number: 9628175
    Abstract: This application discloses apparatuses and methods for selecting and tuning of a select mode of a multi-longitudinal mode device seeded or wavelength locked to a spectrum-sliced external wavelength by either self-seeding or broadband light-source seeding through an array-waveguide grating.
    Type: Grant
    Filed: July 25, 2015
    Date of Patent: April 18, 2017
    Inventors: Marko Sprem, Dubravko Babic
  • Patent number: 9614617
    Abstract: An apparatus (104) mitigates cross-channel nonlinear distortion of an optical signal (138) carried on one of a plurality of wavelength channels (118) in a wavelength division multiplexed (WDM) transmission system (100). The apparatus includes a first optical receiver (126) which is arranged to detect a measure (134) of aggregate optical power of the plurality of wavelength channels. A nonlinear dispersion compensator includes means (144) for applying a phase modulation to the optical signal in proportion to the measure of aggregate optical power.
    Type: Grant
    Filed: October 6, 2010
    Date of Patent: April 4, 2017
    Assignee: Ofidium Pty. Ltd.
    Inventors: Arthur James Lowery, Liang Bangyuan Du
  • Patent number: 9503212
    Abstract: Provided is a station-side apparatus configured to conduct optical communication with a plurality of subscriber apparatuses via a plurality of wavelengths. The station-side apparatus includes a storage apparatus, management information stored in the storage apparatus and configured to indicate whether or not a subscriber apparatus is a first apparatus whose wavelength used for communication is changed to another wavelength, and a transmission unit configured to transmit downlink frames addressed to the plurality of subscriber apparatuses in an order of transmission determined based on the management information.
    Type: Grant
    Filed: December 18, 2014
    Date of Patent: November 22, 2016
    Assignee: Hitachi, Ltd.
    Inventors: Jun Sugawa, Toshiyuki Odaka
  • Patent number: 9294200
    Abstract: A modulator bias selection method, a coherent optical transmitter, and optical modulator solve the problem of generating a correct constellation using the bias points with the minimum phase adjustment range. The optimum modulator bias systems and methods include a coherent optical transmitter with control of four (XI, XQ, YI, YQ) quadrature data signals via a transmitter (Tx) application specific integrated circuit (ASIC), with a modulator bias controller which implements an algorithm to find the optimum bias points. The optimum bias points yield a correct constellation with minimum phase/bias adjustment. An algorithm is used to find the optimum bias solution using fast, simple method, adjusting only one quadrature at a time and exploiting a control feature of the Tx ASIC. This algorithm is significantly simpler than a generalized search, is a local algorithm, and uses only DC power measurement at the transmitter.
    Type: Grant
    Filed: May 13, 2015
    Date of Patent: March 22, 2016
    Assignee: Ciena Corporation
    Inventors: Gary Mak, Yves Beaulieu, Mohammad Sotoodeh
  • Patent number: 9253790
    Abstract: Radio blocs (BRjp) shared in a predetermined frequency band during a periodic radio frame (TRi) between base stations (BS) are allocated to applications in base stations and mobile stations. Each radio block spreading on frequencies (Cj) of said band during a time slot (M?t) of the radio frame and can be associated with an uplink or a downlink. To meet quality-of-service parameters required by an application, a base station estimates occupation rates of the radio blocks during consecutive radio frames, and allocates to the application at least one radio block having an occupation rate less than a threshold and a periodicity expressed in period of frame and depending on the required quality-of-service parameters. The base station are autonomous for the radio block allocations.
    Type: Grant
    Filed: March 4, 2011
    Date of Patent: February 2, 2016
    Assignee: CASSIDIAN SAS
    Inventors: Gérard Marque-Pucheu, Christophe Gruet, Serge Delmas, Christine Helias-Foret
  • Patent number: 9195939
    Abstract: A root node of a decision tree data structure may cover all values of a search space used for packet classification. The search space may include a plurality of rules, the plurality of rules having at least one field. The decision tree data structure may include a plurality of nodes, the plurality of nodes including a subset of the plurality of rules. Scope in the decision tree data structure may be based on comparing a portion of the search space covered by a node to a portion of the search space covered by the node's rules. Scope in the decision tree data structure may be used to identify whether or not a compilation operation may be unproductive. By identifying an unproductive compilation operation it may be avoided, thereby improving compiler efficiency as the unproductive compilation operation may be time-consuming.
    Type: Grant
    Filed: March 15, 2013
    Date of Patent: November 24, 2015
    Assignee: Cavium, Inc.
    Inventors: Rajan Goyal, Kenneth A. Bullis
  • Patent number: 9094131
    Abstract: A signal generating method and apparatus in the field of signal technologies are provided. The method includes: adjusting an incident angle of an optical signal entering a polarization beam splitter, so that the polarization beam splitter outputs a first optical signal and a second optical signal that have a preset power ratio; performing QPSK modulation on the first and second optical signal respectively by using a first and second externally input data streams, to obtain a first and a second QPSK optical signal; before the first QPSK optical signal and the second QPSK optical signal are input into a polarization beam combiner, adjusting a polarization state of the first or the second QPSK optical signal; when the polarization states of the two QPSK optical signals are the same, outputting a 16QAM signal; and when the polarization states of the two QPSK optical signals are orthogonal, outputting a DP-QPSK signal.
    Type: Grant
    Filed: December 18, 2012
    Date of Patent: July 28, 2015
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Lei Liu, Liangchuan Li, Bangning Mao, Li Zeng
  • 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
  • Patent number: 9030924
    Abstract: The present application provides a method for time division multiplex service protection. The method includes: on an OLT in a passive optical network, a working uplink port and a protection uplink port are set for a time division multiplex service and a protection group is created for the working uplink port and the protection uplink port; when a service flow protection for the time division multiplex service is triggered, the time division multiplex service flow is switched from the working uplink port to the protection uplink port, therefore realizing the protection for the time division multiplex service flow. The present application provides an uplink channel protection mechanism for important services in an access system, such as the time division multiplex service, which needs no protection switching protocol, and makes the service recovery time stand within 50 ms, thereby realizing fast and nondestructive recovery of the time division multiplex service.
    Type: Grant
    Filed: December 9, 2009
    Date of Patent: May 12, 2015
    Assignee: ZTE Corporation
    Inventors: Ruichun Dai, Dezhi Zhang
  • Patent number: 9020345
    Abstract: A method for establishing an end-to-end service is provided in the present invention, which includes: acquiring link information in a network and multi-stage multiplexing capability constraint information supported by gateway network elements; when an end-to-end path computation request is received, according to the link information and the multi-stage multiplexing capability constraint information, performing an end-to-end routing computation to acquire an end-to-end routing, and selecting a multi-stage multiplexing capability used on a gateway network element passed by the end-to-end routing; and configuring the end-to-end service, and configuring the selected multi-stage multiplexing capability on the gateway network element passed by the end-to-end routing. A system for establishing the end-to-end service, an optical transport network and a signal transmission method thereof are also provided in the present invention, which can all implement the interconnection between new networks and old networks.
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: April 28, 2015
    Assignee: ZTE Corporation
    Inventors: Xihua Fu, Xinling Zhang
  • Patent number: 9014563
    Abstract: An apparatus is provided that includes n communication channels, and m communication media interfaces, and v virtual lanes. V is a positive integer multiple of the least common multiple of m and n. An information stream is transferred into data and alignment blocks striped across all of the v virtual lanes, the blocks being communicated from the virtual lanes onto the communication channels. The blocks are received on the communication channels. Each of the communication channels transmits a different portion of the blocks striped across all of the v virtual lanes. In more particular embodiments, v>=n>=m. The communication media interfaces can be electrical and optical. Each of the communication channels can include a SerDes interface operating at least 5 Gigabits per second. Furthermore, each of the m communication media interfaces is configured to transmit a different stream of information over a single optical fiber.
    Type: Grant
    Filed: December 11, 2007
    Date of Patent: April 21, 2015
    Assignee: Cisco Technology, Inc.
    Inventors: Mark A. Gustlin, Oded Trainin, Luca Della Chiesa
  • Patent number: 9014550
    Abstract: A cross connecting unit outputs an including frame whose type matches a type of an including frame stored in a storage unit in association with identification information of a multiplexing unit having a problem among including frames generated by an including unit to a backup multiplexing unit when any one of multiplexing units has a problem.
    Type: Grant
    Filed: September 6, 2011
    Date of Patent: April 21, 2015
    Assignee: NEC Corporation
    Inventor: Masahiko Tsuchiya
  • 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: 20150078752
    Abstract: The disclosure discloses a Generic Mapping Procedure (GMP) mapping method for an Optical channel Data Unit (ODU), including: caching low-level ODUk data to a memory according to the rate of low-level ODUk data stream; generating an adjustment byte in a mapping process and encoding the adjustment byte; generating read enable of the cached data by an algorithm according to the adjustment byte, reading the cached low-level ODUk data, and generating Optical channel Data Tributary Unit (ODTU) data according to the read data; and crossing a time slot of the ODTU data in multiple channels to that of a high-level ODU payload, and forming the data in the time slot of the high-level ODU payload and the encoded adjustment byte into a completed high-level ODU frame. The disclosure may further provide a GMP mapping apparatus for an ODU. According to a technical solution of the disclosure, the GMP mapping of the ODU can be implemented according to the dynamic change of a service rate.
    Type: Application
    Filed: April 26, 2012
    Publication date: March 19, 2015
    Applicant: ZTE CORPORATION
    Inventors: Shangqing Wu, Tong Wang, Yingfei Li, Zhangbin Lu
  • Publication number: 20150071641
    Abstract: An apparatus comprising a transmitter configured to generate an optical signal comprising a carrier modulated with at least two sidebands modulated with information, wherein the information introduces a separation gap in a frequency domain between the sidebands and the carrier, wherein one of the sidebands is an undesired sideband and another one of the sidebands is a desired sideband with a higher power intensity than the undesired sideband. A method comprising receiving an optical carrier from a light source and modulating the optical carrier with at least two sidebands modulated with information, wherein the information introduces a separation gap in a frequency domain between the sidebands and the optical carrier, wherein one of the sidebands is an undesired sideband and another one of the sidebands is a desired sideband having a higher power intensity than the undesired sideband.
    Type: Application
    Filed: September 12, 2013
    Publication date: March 12, 2015
    Applicant: Futurewei Technologies, Inc.
    Inventors: Yangjing Wen, Chunlei Liao, Xiao Shen, Yusheng Bai
  • Patent number: 8977131
    Abstract: An optical apparatus receives an upward signal light from a plurality of subscriber units, where the upward signal light is composed of a plurality of time slots corresponding to the plurality of optical subscriber units. The optical apparatus includes a driving unit configured to determine a respective required gain for light from each of the plurality of optical subscriber units, an amplifying section configured to amplify the upward signal light with the required gain corresponding to the time slots of the upward signal light, and a receiver configured to receive the amplified upward signal light.
    Type: Grant
    Filed: February 17, 2009
    Date of Patent: March 10, 2015
    Assignee: Fujitsu Limited
    Inventors: Setsuo Yoshida, Susumu Kinoshita
  • Publication number: 20150063817
    Abstract: A transmission device includes: a signal receiving part configured to receive a time division multiplexing signal in which a plurality of packets are stored; a separating part configured to separate the plurality of packets from the time division multiplexing signal; an assigning part configured to assign an identifier corresponding to a stored position in the time division multiplexing signal to each of the plurality of packets; and a packet transmitting part configured to transmit at least two packets having different identifiers out of the plurality of packets through a common transmission path.
    Type: Application
    Filed: August 5, 2014
    Publication date: March 5, 2015
    Applicant: Fujitsu Limited
    Inventors: Masayuki Ono, Yasuyuki Mitsumori, Kanta Yamamoto
  • Publication number: 20150055956
    Abstract: Disclosed is a passive optical network system using a time division multiplexing scheme. According to one exemplary embodiment, the passive optical network system includes a plurality of optical network units (ONUs); an optical line terminal (OLT) to be connected to the plurality of ONUs for communication and to transmit and receive an optical signal to and from the plurality of ONUs using a time division multiplexing (TDM) scheme, wherein each of the plurality of ONUs includes a light source that generates an optical signal with a predetermined intensity even in burst-off state; and an optical filter disposed on a receiving path of an optical receiver of the OLT to filter out an optical noise signal received from an ONU in burst-off state among the plurality of ONUs.
    Type: Application
    Filed: August 26, 2014
    Publication date: February 26, 2015
    Inventors: Han Hyub LEE, Sang Soo LEE
  • Patent number: 8965209
    Abstract: An optical communication system comprises a network interface device (NID) having a media converter coupled to an optical fiber of a passive optical network (PON). The media converter converts optical signals from the PON into electrical signals for communication across at least one non-optical channel, such as a conductive or wireless connection, to customer premises equipment (CPE), such as a residential gateway or other customer premises (CP) device. Rather than implementing an optical media access control (optical MAC) layer in the NID, an optical MAC layer for handling PON protocols and management is implemented by the CPE, thereby effectively extending the customer end of the PON across at least one non-optical connection to the CPE. By implementing the optical MAC layer at the CPE, the complexity of the NID is reduced thereby lowering the cost of the NID.
    Type: Grant
    Filed: July 7, 2011
    Date of Patent: February 24, 2015
    Assignee: ADTRAN, Inc.
    Inventors: Richard Goodson, Leif J. Sandstrom, Kevin W. Schneider
  • Patent number: 8958697
    Abstract: A system and method for managing the optical layer network data communications of an optical fiber data network by an optical transceiver module is disclosed. The management of the optical layer network data communications comprising data link layer functions or layer 2 functions in an OSI model. Benefits include reduction in reduced cost of network deployments from consolidation of network equipment, such as switches, and reduction in power consumed as well as enabling point-to-multipoint network connections from previously only point-to-point network connection.
    Type: Grant
    Filed: July 8, 2012
    Date of Patent: February 17, 2015
    Inventors: Alexander I. Soto, Walter G. Soto
  • Patent number: 8953433
    Abstract: An optical network device re-routes traffic from a path to a backup path in response to determining that a downstream segment of the primary path is not operational. The optical network device receives traffic on a slot of an optical fiber. For each data unit in the traffic, the optical network device determines, based on receiving the data unit on the slot and based on a flow identifier specified in the data unit, that a given path is associated with the data unit. If a downstream segment of the given path is not operational, the optical network device routes the data unit onto a backup path instead of routing the data unit along the given path. Bandwidth is not reserved for the backup path.
    Type: Grant
    Filed: February 23, 2012
    Date of Patent: February 10, 2015
    Assignee: Juniper Networks, Inc.
    Inventor: Gert Grammel
  • Patent number: 8953942
    Abstract: A technique for providing time division multiplexing (“TDM”) and wavelength division multiplexing (“WDM”) communication services to customer premises (“CP”) over a passive optical network (“PON”) includes multiplexing a downstream TDM signal with downstream WDM signals onto a fiber trunk line coupled between a central office and a remote node (“RN”), separating the downstream WDM signals from the downstream TDM signal at the RN with a wavelength selective filter, power splitting the downstream TDM signal at the RN onto a plurality of fiber access lines as split TDM signals; and recombining each of the WDM signals with a corresponding one of the split TDM signals onto a corresponding one of the fiber access lines.
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: February 10, 2015
    Assignee: Google Inc.
    Inventors: Cedric F. Lam, Ryohei Urata, Hong Liu, Yut Loy Chan
  • Patent number: 8948598
    Abstract: A method for communicating in a passive optical network (PON), includes receiving traffic from a plurality of optical network units (ONUs) transmitting in an upstream transmission channel, wherein each of the ONUs may transmit at any wavelength within a wavelength band associated with the upstream transmission channel. The method also includes dividing the upstream transmission channel into a plurality of sub-channels, that each include a subset of the wavelength band associated with the upstream transmission channel. The method further includes determining the identity of each of the plurality of ONUs transmitting in each of the sub-channels, assigning a plurality of ONUs transmitting in the upstream transmission channel to each of at least two of the sub-channels based on the determination of the ONUs transmitting in that sub-channel, and allocating transmission timeslots for time-shared transmission by the ONUs in one or more of the sub-channels.
    Type: Grant
    Filed: September 18, 2008
    Date of Patent: February 3, 2015
    Assignee: Fujitsu Limited
    Inventor: Martin Bouda
  • Patent number: 8948589
    Abstract: A manner of providing for testing of access fibers in a PON (passive optical network) using OTDR (optical time-domain reflectometry). According to the invention, a PON includes an optical splitter module having one or more optical couplers that combines downstream light from 1×N optical splitter directing the output of an OLT (optical line terminal) and a cyclic AWG (arrayed waveguide grating) for transmission toward one or more ONUs (optical network units). The splitter module is preferably formed on a single semiconductor chip, such as a PIC (photonic integrated circuit) chip and may reside in an outside plant of the PON.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: February 3, 2015
    Assignee: Alcatel Lucent
    Inventors: Joseph L. Smith, Ronald Heron
  • Patent number: 8942566
    Abstract: A bandwidth allocator for communicating with communication terminals by transmitting and receiving data packets over a line having its communication bandwidth divided into periods of time of a predetermined length. The allocator includes a controller controlling allocation of the bandwidth by using allocation grants as the periods of time. The controller includes a scheduler scheduling the allocation grants so as to cause one allocation grant to partially overlap as a shared grant with another allocation grant adjacent to the one allocation grant. Thus, the bandwidth allocator can minimize allocation loss, otherwise caused by no allocation to an allocation grant, and improve the use efficiency of the bandwidth.
    Type: Grant
    Filed: August 29, 2011
    Date of Patent: January 27, 2015
    Assignee: Oki Electric Industry Co., Ltd.
    Inventors: Hideaki Tamai, Akihiro Takahashi, Satoshi Furusawa, Akiya Suzuki
  • Patent number: 8938168
    Abstract: There is provided an office-side line concentration device that accommodates a plurality of passive optical networks, including a plurality of receiving means connected to each of the plurality of passive optical networks, and interface means for controlling a transmission timing of user data from the plurality of passive optical networks so that user data received by the plurality of receiving means can be arranged closely in an uplink, thus enabling effective use of bandwidth in the uplink.
    Type: Grant
    Filed: October 1, 2013
    Date of Patent: January 20, 2015
    Assignee: Sumitomo Electric Industries, Ltd.
    Inventor: Kazuhisa Yamashita
  • Patent number: 8923337
    Abstract: Instant discloser is a method to transmit multiple data-streams of varying capacity data using Virtual Concatenation (VCAT) over Synchronous Digital Hierarchy (SDH) network, comprising acts of determining number of data bytes to be requested for each Virtual Concatenation Group (VCG) in a row-time of the aggregated bandwidth and storing it in a VCG request configuration memory, reading the requested number of data bytes from each data-stream in order in to a Row Buffer for each row time of an SDH frame, reading data stored in the Row Buffer from memory address determined by one or more connection memory wherein the connection memory is programmed to carry out sequencing of bytes of the Row Buffer based on the VCAT numbering, and inserting path overhead (POH) and pointer information in to the read data streams in previous step to transmit multiple data-streams of varying capacity data using VCAT over SDH network.
    Type: Grant
    Filed: December 22, 2009
    Date of Patent: December 30, 2014
    Assignee: Tejas Networks Limited
    Inventor: Kanwar Jit Singh
  • Publication number: 20140369692
    Abstract: A technique for implementing an optical virtual private network is disclosed. In one particular exemplary embodiment, the technique may be realized by a method comprising the steps of managing at least one client edge-virtual private network at a client edge by a service provider; and supporting a set of client edge-users at each client edge-virtual private network at each client edge wherein each client edge provides at least one virtual private network service to each client edge-user; wherein each client edge determines connectivity associated with each client edge-user and the service provider establishes the connectivity determined by each client edge.
    Type: Application
    Filed: June 11, 2014
    Publication date: December 18, 2014
    Inventor: HAMID OULD BRAHIM
  • Publication number: 20140369677
    Abstract: An optical transmitter converts a plurality of transmission signals transmitted via a plurality of lanes into a multi-carrier signal and transmits the multi-carrier signal. The optical transmitter includes: a controller configured to generate allocation information that indicates an allocation of sub-carriers to the plurality of lanes according to a bit rate of the transmission signal of each of the lanes and a possible transmission capacity of each of the sub-carriers; and a signal processor configured to convert the plurality of transmission signals into the multi-carrier signal in accordance with the allocation information generated by the controller.
    Type: Application
    Filed: September 3, 2014
    Publication date: December 18, 2014
    Inventors: Toshiki Tanaka, Tomoo Takahara, MASATO NISHIHARA
  • Patent number: 8903239
    Abstract: An optical modulator includes: a modulator including an optical waveguide provided in a semiconductor substrate having an electro-optical effect and an electrode to apply an electric field depending on a bias voltage and a modulation signal to the optical waveguide; a driver circuit to generate a modulation signal in accordance with an input signal; a superimposer to superimpose a reference signal on the bias voltage, the reference signal having lower frequency than the modulation signal; and a controller to control a bias voltage in a direction orthogonal to a modulation direction of the modulator based on the frequency component of the reference signal extracted from a modulated optical signal generated by the modulator.
    Type: Grant
    Filed: December 12, 2011
    Date of Patent: December 2, 2014
    Assignee: Fujistu Optical Component Limited
    Inventors: Hiroshi Nishimoto, Hiroshi Kuwahara
  • Patent number: 8891973
    Abstract: A receiving unit using a voltage-controlled oscillator is allowed to compensate for the frequency characteristics of the voltage-controlled oscillator resulting from temperature change, without adding a capacitive element for temperature compensation. A receiving unit and an optical line terminal include a clock and data recovery circuit that extracts a clock signal and a data signal from a received signal, and have: a calibrator that calibrates an oscillation frequency of a voltage-controlled oscillator included in the clock and data recovery circuit; and a managing unit having a function of managing a schedule for receiving signals, the managing unit selecting a time where a duration of a certain state meets a time required for calibration by the calibrator to thereby output a reset signal (calibration instruction signal) to the calibrator, the state having no received signal (upstream signal) from which a clock signal and a data signal are to be extracted.
    Type: Grant
    Filed: July 6, 2010
    Date of Patent: November 18, 2014
    Assignees: Sumitomo Electric Industries, Ltd., Ensphere Solutions, Inc.
    Inventor: Naruto Tanaka
  • Patent number: 8886041
    Abstract: An example is a bandwidth control method employed in an optical line terminal including: determining a first time point at which a first optical network unit starts the processing of transitioning between the states in a case where the first optical network unit is to be transitioned between the states; transmitting a state control signal containing the first time point to the first optical network unit in order to control the first optical network unit to start the processing of transitioning between the states; and stopping allocating a bandwidth used to transmit a signal to the optical line terminal to a second optical network unit during a period from the first time point until it is determined that the first optical network unit has finished the processing of transitioning between the states.
    Type: Grant
    Filed: May 24, 2012
    Date of Patent: November 11, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Takahiro Tanaka, Tohru Kazawa, Shota Takagi
  • Patent number: 8886040
    Abstract: The invention relates to techniques for controlling a dynamic hitless resizing in data transport networks. According to a method aspect of the invention, a network connection comprises M tributary slots defined in a payload area of a higher order transport scheme of the data transport network and the method comprises the steps of receiving a connection resize control signal at each of the nodes along the path of the network connection; adding at each node along the path in response to the connection resize control signal a second set of N tributary slots to the first set of the M tributary slots, such that the network connection comprises M+N tributary slots; and increasing, after M+N tributary slots are available for the network connection at each node along the path, a transport data rate of the network connection.
    Type: Grant
    Filed: March 19, 2012
    Date of Patent: November 11, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Maarten Vissers, Yang Yang, Huub van Helvoort, Wei Su
  • Publication number: 20140301733
    Abstract: There are provided an optical transponder having a first end and a second end, as well as an electric switch having the transponder. The transponder includes an optical interface, at the first end, having a variable rate optical transmitter and a variable rate optical receiver to respectively transmit and receive signals using at least one of different bandwidths and different bit rates. The transponder further includes an electrical interface, at the second end, having an electrical interface throughput matching an optical capacity of the optical interface. The transponder also includes a processor for controlling the optical capacity.
    Type: Application
    Filed: April 3, 2014
    Publication date: October 9, 2014
    Applicant: NEC Laboratories America, Inc.
    Inventors: Junqiang Hu, Ting Wang
  • Patent number: 8855495
    Abstract: Methods, systems, and apparatuses for time-based composite modulation of an optical carrier signal are provided. Time-based composite modulation includes determining a plurality of fixed time slots for the optical carrier signal, wherein the plurality of fixed time slots comprise a time-division-multiplexing frame. Determining a modulation format for each fixed time slot of the time-division-multiplexing frame, wherein a transport spectral efficiency of the modulation format determined for a first fixed time slot is different from a transport spectral efficiency of the modulation format determined for a second fixed time slot, and determining a number of binary bits for each fixed time slot of the time-division-multiplexing frame, wherein the number of binary bits for a fixed time slot is based on the modulation format determined for the fixed time slot.
    Type: Grant
    Filed: November 30, 2011
    Date of Patent: October 7, 2014
    Assignee: AT&T Intellectual Property I, L.P.
    Inventors: Xiang Zhou, Peter Magill
  • Patent number: 8849116
    Abstract: An exemplary method and apparatus are provided for data transmission in an optical transport network that includes receiving client data from a client, mapping the client data into a frame structure, mapping the frame structure into tributary slots of a data transport structure, and transmitting the data transport structure. The data transport structure contains a fixed number of tributary slots and the size of the frame structure is selectable in granularity of the tributary slots of the data transport structure.
    Type: Grant
    Filed: March 9, 2010
    Date of Patent: September 30, 2014
    Assignee: Alcatel Lucent
    Inventors: Alberto Bellato, Pietro Vittorio Grandi, Matteo Gumier, Sergio Belotti, Stephen John Trowbridge
  • Patent number: 8849121
    Abstract: A control device (13) for scheduling the transmission of signals from a plurality of transmitters (14, 15, 16, 17, 18, 19, 20, 21). The control device (13) comprises an evaluation element (22) arranged to determine the power level of the signals received from each of the transmitters and a scheduling element (23) adapted to determine a transmit schedule comprising the order that the plurality of transmitters should transmit based on the power levels of the signals received from the transmitters (14, 15, 16, 17, 18, 19, 20, 21). A method of operation and a node incorporating the control device is also disclosed.
    Type: Grant
    Filed: September 12, 2008
    Date of Patent: September 30, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Einar In De Betou, Peter Ohlen
  • Publication number: 20140286640
    Abstract: A network design method that determines a TDM transmission line for accommodating a given demand includes: extracting an available demand from among a plurality of provided demands; calculating a total bandwidth of the extracted available demand; sequentially selecting the plurality of demands; generating candidates for a combination of TDM transmission lines that accommodate the selected demand; and determining a combination of TDM transmission lines that accommodates the selected demand from among the candidates for the combination of TDM transmission lines. The generating process includes: extracting a TDM transmission line with a band utilization efficiency higher than a specified threshold from among TDM transmission lines including the selected demand as an available demand; and generating candidates for a combination of TDM transmission lines that accommodate the selected demand using the extracted TDM transmission line.
    Type: Application
    Filed: February 17, 2014
    Publication date: September 25, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Kazuyuki Tajima, Tomohiro Hashiguchi, Yutaka Takita
  • Patent number: 8830992
    Abstract: The fabric card includes at least one fabric card chip and at least two fabric card connector groups, where each fabric card connector group of the at least two fabric card connector groups includes at least two fabric card connectors, the number of fabric card chips is less than the number of at least two fabric card connector groups, each fabric card chip of the at least one fabric card chip connects to all fabric card connectors in at least one fabric card connector group, all fabric card connectors in the fabric card connector group that connect to the fabric card chip exchange data using the fabric card chip. This fully utilizes an exchange capability of the fabric card chip and saves system resources.
    Type: Grant
    Filed: February 25, 2014
    Date of Patent: September 9, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Guoqiang Ma
  • Patent number: 8824888
    Abstract: The present invention relates to a method for negotiating link capability information. The method includes: After a higher order optical channel data unit (ODU) link is established, a second node receives first higher order ODU link capability information supported by a first node at one end of the link, where the second node is located at the other end of the link; determines link capability information according to the first higher order ODU link capability information and second higher order ODU link capability information that is supported by the second node; and sends the link capability information to the first node; or sends the second higher order ODU link capability information to the first node, so that the first node determines the link capability information according to the first higher order ODU link capability information and the second higher order ODU link capability information.
    Type: Grant
    Filed: February 24, 2012
    Date of Patent: September 2, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yi Lin, Xiaobing Zi, Qiuyou Wu
  • Patent number: 8824894
    Abstract: When an ONU accommodating range is enlarged, and ONUs shorter and ONUs longer in a communication path to an OLT are accommodated in a PON at the same time, there is a need to change a light intensity at the time of transmitting a downstream signal in order that both of the ONUs receive a downstream signal from the OLT. When a near-end ONU receives a signal having a light intensity necessary to communicate between the OLT and a far-end ONU, there arises such a problem that the light intensity is as high as an ONU receiver fails. In order to eliminate the ONU failure of the above problem, prior to transmission of the downstream signal, a downstream signal transmission schedule (downstream light intensity map) is notified to all of the ONUs. An optical transceiver of the OLT has a function of adjusting an output light intensity, and adjusts the light intensity to values receivable by the individual ONUs when the signal arrives at the respective ONUs according to route distances to the respective ONUs.
    Type: Grant
    Filed: August 30, 2011
    Date of Patent: September 2, 2014
    Assignee: Hitachi, Ltd.
    Inventors: Masao Niibe, Masahiko Mizutani