Hub Or Central Office Patents (Class 398/70)
  • Patent number: 8041216
    Abstract: In a passive optical network, an upstream transmission rate from an ONT to an OLT can be optimized by matching a transmission scheme for a channel to the upstream transmission characteristics of the channel. An FEC coding can be made channel dependent so that channels with low error rates can use minimal protection, and therefore minimal overhead, while channels with high input bit error rates can use the level of FEC coding required to produce a desired output bit error rate.
    Type: Grant
    Filed: June 10, 2009
    Date of Patent: October 18, 2011
    Assignee: Alcatel Lucent
    Inventor: Adriaan J. de Lind van Wijngaarden
  • Patent number: 8036530
    Abstract: A translation agent adapts DOCSIS information, primarily QoS information, for transmission over a PON. The agent places into an IP address field of a DHCP message the MAC address of an ONU associated with a CPE device attempting to register with a CMTS. The translation agent intercepts DHCP reply messages from the DHCP server using the MAC address of the ONU. The translation agent extracts information, including an IP address of the client CPE assigned by the DHCP server. The agent downloads a configuration file for the CPE device using the configuration filename and configuration file server contained in a DHCP reply message. Information contained in the configuration file is converted from content in a format used by DOCSIS, to content in a format used by PON devices. The translated content includes QoS parameters, functions related to which are controlled at the ONU by an OLT coupled to the CMTS.
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: October 11, 2011
    Assignee: ARRIS Group, Inc.
    Inventors: Erich Arnold, Jeff Howe, Thomas Cloonan, Mike Emmendorfer
  • Patent number: 8027586
    Abstract: A passive optical network (PON) system which enables plural types of ONUs having different signal transmission speeds to be connected to one OLT. An optical line terminating apparatus (OLT) connected to plural types of ONUs having different signal transmission speeds through an optical distribution network includes an optical transmitter-receiver connected to the optical distribution network, a transmission/reception line interface connected to a wide area network, a downstream frame processing section for converting a packet received by the transmission/reception line interface from the wide area network into a downstream frame containing identification information on a destination ONU in a header, and a downstream transmission controller for modulating the downstream frame at a speed corresponding to a signal transmission speed of the destination ONU and outputting the modulated frame to an electrical/optical converter connected to the optical transmitter-receiver.
    Type: Grant
    Filed: February 21, 2008
    Date of Patent: September 27, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Hiroki Ikeda, Masahiko Mizutani, Toshiki Sugawara, Shinobu Gohara
  • Patent number: 8023820
    Abstract: Systems, apparatus, methods and computer program products are provided for downloading a whitelist onto a passive optical network including a passive optical network and a management interface communicatively coupled to the passive optical network and configured to provision the whitelist. An optical line terminal also on the passive optical network includes a passive optical network card operable to broadcast the whitelist to optical network terminals which are configured to receive and enforce the whitelist.
    Type: Grant
    Filed: January 14, 2008
    Date of Patent: September 20, 2011
    Assignee: Tellabs Vienna, Inc.
    Inventors: Marc R. Bernard, Edward J. Szczebak
  • Publication number: 20110222854
    Abstract: An optical communications system includes a hub modem and a set of two or more remote modems. Each remote modem includes a transmitter stage for transmitting a respective uplink data stream within a selected one of a set of two or more sub-channels. The hub modem optically communicates with the set of remote modems. The hub modem includes a receiver stage having an optical front-end for receiving an uplink optical channel signal within a spectral range that encompasses the set of two or more spectral sub-bands; a photodetector for detecting modulation components of the received uplink optical channel signal and for generating a corresponding high bandwidth analog signal; and a digital signal processor for processing the high bandwidth analog signal to recover the respective uplink data stream transmitted by each remote modem.
    Type: Application
    Filed: March 14, 2011
    Publication date: September 15, 2011
    Applicant: CIENA CORPORATION
    Inventors: Kim B. ROBERTS, James HARLEY
  • Patent number: 8014674
    Abstract: A method for operating PON (passive optical network) user terminal and a PON user terminal equipment, when there is only few data service request in the PON, the PON user terminal operates in power saving manner which maintains low speed connection, the method comprises: a judgment condition that the PON user terminal changes to power saving state is set; the PON user terminal determines whether its own state meet the judgment condition changing to power saving state, if so, it transmits a request to change to power saving state to the OLT (optical line terminal); after the PON user terminal receives the respond that the OLT has accepted the request, it controls parts of the modules therein to change to power saving state, and intermittently switch over between power saving state and normal state. The invention allows saving power under the condition that keeps the low speed service uninterrupted, in the meanwhile alleviates the pressure of ONU terminal thermal design.
    Type: Grant
    Filed: March 20, 2008
    Date of Patent: September 6, 2011
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Hai Gao, Yong He
  • Patent number: 8014673
    Abstract: A management method of an optical fiber network system is disclosed. The optical fiber network system includes at least one user apparatus and an optical network unit (ONU), and the ONU is connected with the user apparatus. The management method includes the steps of: adopting at least one information string, which is set by an ONU management and control interface (OMCI), by the optical network unit; packing the information string into a management packet; and transmitting the management packet to the user apparatus by the optical network unit according to an Ethernet protocol.
    Type: Grant
    Filed: October 18, 2007
    Date of Patent: September 6, 2011
    Assignee: Accton Technology Corporation
    Inventor: Chuan-Wei Liu
  • Patent number: 8000602
    Abstract: The present invention discloses methods for reducing power consumption in a PON while maintaining service continuity, the method including the steps of: providing an OLT operationally connected to at least one ONU; triggering a sleep request for at least one requesting ONU; upon receiving a sleep acknowledgement, activating a sleep mode for at least one requesting ONU according to a sleep period designated in the sleep request; and terminating the sleep mode according to the sleep period. Preferably, the sleep acknowledgement is transmitted from the OLT to the requesting ONU. Preferably, the sleep period is executed by a sleep command in the sleep acknowledgement. Preferably, the method further includes the step of: upon completion of the sleep period, transmitting buffered data traffic from the OLT to a sleeping ONU. Preferably, the step of transmitting is performed without the sleeping ONU being re-registered and without causing packet reordering.
    Type: Grant
    Filed: April 17, 2008
    Date of Patent: August 16, 2011
    Assignee: PMC-Sierra Israel Ltd.
    Inventors: Onn Haran, Lior Khermosh, Victor Vaisleib
  • Patent number: 7978976
    Abstract: An optical data transmission system having a hub, an optical router, and a plurality of optically pumped sources at a curb location, and a plurality of optical network units (ONUs). The ONUs generate and transmit respective data modulated pumping light to the curb location where it is received by the optically pumped sources, which convert it into the wavelength channels having predefined wavelength ranges assigned to respective ONUs. The optical router routes the wavelength channels for transmission to the hub.
    Type: Grant
    Filed: July 18, 2003
    Date of Patent: July 12, 2011
    Assignee: Schofield Technologies LLC
    Inventors: Olli-Pekka Pohjola, Ari Tervonen, Harri T. Jarvinen, Markku Oksanen
  • Patent number: 7957647
    Abstract: In a WDM-PON system wherein a plurality of ONUs transfer signals by sharing wavelengths, one wavelength dedicated to a ranging procedure is set, and the ranging is performed with only the dedicated wavelength, so as to measure reciprocating delay times. At the other wavelengths, transmission signals from a plurality of ONUs are transferred in time division multiplexing based on the obtained reciprocating delay times. An OLT includes a burst receiver circuit for only the wavelength dedicated to the ranging, and subsequently to the ranging, the OLT adjusts transmission amplitudes and transmission phases for the ONUs, so as to equalize received amplitudes and received phases in the OLT. For this purpose, the OLT includes means for measuring the amplitudes and phases of received signals, as the burst receiver circuit, and it includes a table for managing the received amplitudes and received phases of the respective ONUs.
    Type: Grant
    Filed: April 15, 2008
    Date of Patent: June 7, 2011
    Assignee: Hitachi, Ltd.
    Inventors: Tohru Kazawa, Yusuke Yajima, Masaki Oohira
  • Patent number: 7953325
    Abstract: An optical fiber network can include an outdoor laser transceiver node that can be positioned in close proximity to the subscribers of an optical fiber network. The outdoor laser transceiver node does not require active cooling and heating devices that control the temperature surrounding the laser transceiver node. The laser transceiver node can adjust a subscriber's bandwidth on a subscription basis or on an as-needed basis. The laser transceiver node can also offer data bandwidth to the subscriber in preassigned increments. Additionally, the laser transceiver node lends itself to efficient upgrading that can be performed entirely on the network side. The laser transceiver node can also provide high speed symmetrical data transmission. Further, the laser transceiver node can utilize off-the-shelf hardware to generate optical signals such as Fabry-Perot (F-P) laser transmitters, distributed feed back lasers (DFB), or vertical cavity surface emitting lasers (VCSELs).
    Type: Grant
    Filed: August 26, 2009
    Date of Patent: May 31, 2011
    Assignee: Enablence USA FTTX Networks, Inc.
    Inventors: James O. Farmer, John J. Kenny, Patrick W. Quinn, Thomas A. Tighe, Paul F. Whittlesey, Emmanuel A. Vella
  • Patent number: 7953324
    Abstract: System and method for data synchronization in Passive Optical Networks. According to an embodiment, the present invention provides a method for providing upstream data synchronization in an optical communication network. The method includes sending data from an Optical Network Unit. The data includes a first data frame, which includes a header sequence, a synchronization segment, and a data segment. The synchronization segment includes 66 bits, which includes a first number of bits having nonzero values and a second number of bits having a value of zero. The first number is different from the second number. The method further includes receiving at least the first data frame by an Optical Line Terminal. The method also includes processing the first data frame. The method additionally includes selecting a first segment of the first data frame, the first segment including 66 bits.
    Type: Grant
    Filed: November 13, 2007
    Date of Patent: May 31, 2011
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Raymond W. K. Leung, Dongyu Geng, Dongning Feng, Frank Effenberger, Sergio Benedetto, Guido Montorsi
  • Patent number: 7929862
    Abstract: After implementing a scrambler upon an electric signal of digital signals to be transmitted to a user terminal, this electric signal is converted into a digital optical signal, and an analog optical signal and this digital optical signal are multiplexed by wavelength division multiplexing, thereby reducing influence of cross-talk interference that is exerted on the analog optical signal by the digital optical signal.
    Type: Grant
    Filed: January 31, 2005
    Date of Patent: April 19, 2011
    Assignee: Fujitsu Limited
    Inventors: Katsuhiko Hakomori, Hiroshi Nishimoto, Akihiko Ichikawa
  • Patent number: 7925164
    Abstract: An optical line terminal (OLT) performs power management control in a passive optical network (PON) by acquiring a respective reception level for each optical network unit (ONU) in the PON and maintaining a reception table that stores the respective reception level for each ONU. Prior to receiving a burst signal from an ONU, it sets a reception threshold of an optical receiver at the OLT with the reception level of the ONU.
    Type: Grant
    Filed: July 17, 2007
    Date of Patent: April 12, 2011
    Assignee: Broadlight Ltd.
    Inventors: Gal Sitton, Jacob Harel, Ifat Naaman
  • Patent number: 7920789
    Abstract: A system for communication of signals between remote devices and monitoring and control devices via fiber. The system in accordance with one aspect of the invention includes a plurality of remote interface units each coupled to a corresponding one of the remote devices, a base unit coupled to one or more monitoring devices and one or more control devices, and a central hub coupled between the base unit and the plurality of remote interface units. The central hub is coupled to the base unit by a first fiber optic link, and is coupled to the remote interface units by additional fiber optic links.
    Type: Grant
    Filed: January 5, 2009
    Date of Patent: April 5, 2011
    Assignee: Multidyne Electronics Inc.
    Inventors: Vincent Jachetta, Brian C. Moore, James G. Jachetta, Francis P. Jachetta
  • Patent number: 7912375
    Abstract: An optical transceiver performs an optical transmitting and receiving operation, and has a first memory and an external interface. The external interface receives information from a host device and writes the received information in the first memory. The external interface reads the information from the first memory in response to an external command and transfers externally the read information. The information includes at least one of an operation start date, when the optical transceiver starts the optical transmitting and receiving operation, and an operation termination date, when the optical transceiver terminates the optical transmitting and receiving operation.
    Type: Grant
    Filed: April 15, 2009
    Date of Patent: March 22, 2011
    Assignee: Mitsubishi Electric Corporation
    Inventors: Harufusa Kondo, Masahiko Ishiwaki
  • Publication number: 20110026922
    Abstract: A passive optical network system and method in which at least part of the data is optically transmitted through a single optical fiber using a wavelength division multiplexing technique, with a plurality of signals being carried through the fiber in each direction, a different wavelength being used for each of the multiplexed upstream and downstream signals. The system may be retrofitted into existing telecommunications system to provide a multi-fold increase in the available bandwidth of long-distance optical fiber transmission.
    Type: Application
    Filed: July 31, 2009
    Publication date: February 3, 2011
    Inventors: Yusuke Ota, Jangsun Kim
  • Patent number: 7881613
    Abstract: Provided are an apparatus and method for tracking a wavelength in a passive optical subscriber network in which a central base station and at least one subscriber terminal are connected via a remote node. The apparatus includes a first wavelength aligning unit multiplexing and aligning wavelengths of optical signals from a plurality of single-mode optical sources of the central base station; a second wavelength aligning unit multiplexing and aligning wavelengths of optical signals transmitted to the remote node from a plurality of single-mode optical sources of the subscriber terminal; and a third wavelength aligning unit demultiplexing and aligning wavelengths of optical signals from the second wavelength aligning unit, the third wavelength aligning unit being included in the central base station.
    Type: Grant
    Filed: December 7, 2006
    Date of Patent: February 1, 2011
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Byoung Whi Kim, Woo Ram Lee, Yun Chur Chung, Eui Seung Son, Jang Won Chae
  • Publication number: 20110008047
    Abstract: A device and method are provided for transmitting an optical signal including at least two optical components to be transmitted respectively through at least two optical links that can be established respectively between the transmission device and at least two terminal devices. The transmission device and method associate, based on at least one parameter representative of the optical losses of the optical links, at least one of the optical components to at least one optical link selected from the optical links and to a transmission optical power.
    Type: Application
    Filed: February 26, 2009
    Publication date: January 13, 2011
    Applicant: FRANCE TELECOM
    Inventors: Julien Poirrier, Franck Payoux, Philippe Chanclou
  • Patent number: 7860393
    Abstract: A system and method for simultaneous delivery of a plurality of independent blocks of 500 MHz digital broadcast television services, stacking a plurality of RF blocks on a plurality of spectrally sliced WDM optical bands.
    Type: Grant
    Filed: November 24, 2008
    Date of Patent: December 28, 2010
    Assignee: AT&T Intellectual Property I, LP
    Inventors: Martin Birk, Patrick P. Iannone, Kenneth C. Reichmann, Nicholas J. Frigo, Cedric F. Lam
  • Patent number: 7848652
    Abstract: A wavelength division multiplexing passive optical network system is provided. A central office generates a multi-mode light having a mode interval equal to a period interval of a multiplexing filter of the remote node and the multi-mode light is used to control a wavelength of an uplink transmission optical signal of the optical network unit. A remote node multiplexes the multi-mode light with the multiplexing filter to transmit the multiplexed multi-mode light to the optical network unit and demultiplexes the uplink transmission optical signal to transmit the demultiplexed uplink transmission optical signal to the central office. An the optical network unit generates the uplink transmission optical signal by modulating a data signal with a Fabry-Perot laser which uses the multiplexed multi-mode light as an injection optical source. Accordingly, it is possible to control a wavelength of a transmitter of the optical network unit by using the injection optical source generated by the central office.
    Type: Grant
    Filed: December 2, 2004
    Date of Patent: December 7, 2010
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Moon Seob Lee, Byung Tak Lee, Hyun Seo Kang, Jai Sang Koh
  • Patent number: 7848654
    Abstract: A radio-over-fiber (RoF) wireless picocellular system adapted to form an array of substantially non-overlapping individual picocells by operating adjacent picocells at different frequencies is operated to form one or more combined picocells. The combined picocells are formed from two or more neighboring picocells by the central head-end station operating neighboring picocells at a common frequency. Communication between the central head-end station and a client device residing within a combined picocell is enhanced by the availability of two or more transponder antenna systems. Thus, enhanced communication techniques such as antenna diversity, phased-array antenna networks and multiple-input/multiple-output (MIMO) methods can be implemented to provide the system with enhanced performance capability. These techniques are preferably implemented at the central head-end station to avoid having to make substantial changes to the wireless picocellular system infrastructure.
    Type: Grant
    Filed: September 28, 2006
    Date of Patent: December 7, 2010
    Assignee: Corning Cable Systems LLC
    Inventors: Michael Sauer, Richard S. Vodhanel, Martyn N. Easton, Aravind Chamarti, Jack Winters
  • Patent number: 7835644
    Abstract: A system is provided for intercepting signals transmitted between a target served by a fiber optic network and a subscriber. A network is described having a phone switch at a central office configured to receive signals for transmission to and from a target, such as the target of a criminal investigation. A signal received at the central office is assigned to an analog circuit, and a monitoring device configured to intercept and monitor the signal is installed along the analog circuit at a location that allows the monitoring of communications without notifying the target that he is under surveillance. After the signal has been monitored, it is converted to a digital signal for transmission. A method is also provided for intercepting a signal transmitted between the target served by a fiber optic network and a subscriber, such that a monitoring device may be installed without alerting the target.
    Type: Grant
    Filed: December 22, 2006
    Date of Patent: November 16, 2010
    Assignee: Verizon Patent and Licensing Inc.
    Inventors: Robert A. Quan, James C. Jones, Karen J. Jackson, Dagmar D. Mayor, Rosa M. Underwood
  • Patent number: 7822344
    Abstract: A system for communication of signals between remote devices and monitoring and control devices via fiber. The system in accordance with one aspect of the invention includes a plurality of remote interface units each coupled to a corresponding one of the remote devices, and a base unit coupled to the one or more monitoring devices and the one or more control devices. The plurality of remote interface units and the base unit are interconnected by fiber optic links to form a ring. Each of the remote interface units supplies a video signal to the base unit for distribution to the one or more monitoring devices, and the base unit supplies control signals from the one or more control devices to the plurality of remote interface units.
    Type: Grant
    Filed: September 30, 2005
    Date of Patent: October 26, 2010
    Assignee: Multidyne Electronics Inc.
    Inventors: Vincent Jachetta, Brian C. Moore, James G. Jachetta, Francis P. Jachetta
  • Patent number: 7809235
    Abstract: A fiber distribution device includes a swing frame chassis pivotally mounted to a support structure. At least a first optical splitter module is mounted to the swing frame chassis. Pigtails having connectorized ends are carried by the swing frame chassis and have portions that are routed generally vertically on the swing frame chassis. An optical termination field includes fiber optic adapters carried by the swing frame chassis. The fiber optic adapters are configured to receive the connectorized ends of the pigtails.
    Type: Grant
    Filed: May 4, 2009
    Date of Patent: October 5, 2010
    Assignee: ADC Telecommunications, Inc.
    Inventors: Randy Reagan, Jeffrey Gniadek, Thomas Parsons, Michael Noonan
  • Publication number: 20100239258
    Abstract: An optical PON network comprises a central office which generates N DPSK modulated optical signals, where N is an integer greater than 1, an optical coupling which connects the N signals to at least one optical fibre, a passive distribution mode located remotely from the central office which has at least one input port that is coupled to the fibre and a plurality of output node being arranged to transmit a first wavelength of the N signals to at least one of its output ports, and at least one optical network unit connected through a respective optical fibre to the first output port of the passive distribution node. The passive distribution node comprises an arrayed waveguide grating which provides a passive optical connection between its input port and the first output port and which for that connection functions as a bandpass filter having a profile and bandwidth selected such that the DPSK optical signal passed to the input node is converted to an intensity modulated signal at the output port.
    Type: Application
    Filed: April 24, 2008
    Publication date: September 23, 2010
    Inventors: Nicola Calabretta, Marco Presi, Giampiero Contestabile, Pierpaolo Ghiggino, Ernesto Ciaramella, Fabio Cavaliere, Roberto Proiettii
  • Patent number: 7796888
    Abstract: A method and system for ensuring confidentiality of signal transmission in a point-to-multipoint data transmission network like Ethernet passive optical network, including at least one hub, at least one transmission medium and at least one station connected to the hub via the transmission medium. When an upstream signal is transmitted from a first station, the upstream signal is reflected by at least one disturbing reflector for producing a disturbing reflection. The disturbing reflection combines with a second reflection of the upstream signal and renders the second reflection undecodable by a second station.
    Type: Grant
    Filed: January 8, 2008
    Date of Patent: September 14, 2010
    Inventors: Olli Pekka Pohjola, Ari Tervonen
  • Patent number: 7783201
    Abstract: An optical repeater device of the present invention comprises: a preamble compensating circuit 53, for taking out a normal data signal from burst signals propagating through a communication transmission path, and for adding a preamble signal before and/or after the data signal. Furthermore, the preamble compensating circuit 53 comprises: a detector circuit 53a, for inputting the burst signal, and for outputting only the normal data signal; a buffer circuit 53b, for storing the data signal output from the detector circuit 53a, and for outputting thereof; a preamble signal generation circuit 53d, for outputting at least one type of the preamble signal; and an data output select circuit 53e, for outputting the data signal at the time of the data signal input from the buffer circuit 53b, and for outputting the preamble signal from the preamble signal generation circuit 53d at any other time thereof.
    Type: Grant
    Filed: March 11, 2008
    Date of Patent: August 24, 2010
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Masayuki Miura, Kunio Odaka, Fuyuki Takeuchi
  • Patent number: 7783198
    Abstract: A passive optical network includes: a central office for generating multiplexed downstream optical signals and receiving an upstream optical signal; a plurality of optical network units for receiving a corresponding downstream optical signal and generating subcarrier channels carrying electrical data of an assigned frequency; and a remote node for photoelectrically converting the channels into electrical data, electro-optically converting the electrical data into at least one upstream optical signal.
    Type: Grant
    Filed: December 28, 2006
    Date of Patent: August 24, 2010
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Dae-Kwang Jung, Yun-Je Oh, Jin-Woo Park, Sang-Rok Lee, Il-Lae Kim
  • Patent number: 7761008
    Abstract: In an optical transmission method and device of a point-multipoint type, whether or not identification information of an optical network unit designated is received within a fixed phase tolerance for a transmission enabling phase designated to optical network units on multipoint sides is determined. When it is determined that no identification information of the optical network unit designated is received and identification information of any optical network unit is received up to a transmission enabling phase subsequently designated, a transmission stop command is transmitted to the optical network unit whose identification information is received.
    Type: Grant
    Filed: August 8, 2007
    Date of Patent: July 20, 2010
    Assignee: Fujitsu Limited
    Inventors: Toshimi Kida, Kazuhiro Uchida
  • Patent number: 7751712
    Abstract: A Passive Optical Network includes: an Optical Line Terminal, an Optical Distribution Network, and an Optical Network Unit or an Optical Network Terminal, wherein the Optical Line Terminal is adapted to exchange data with the Optical Network Unit or the Optical Network Terminal by using an optical module via the Optical Distribution Network, and the optical module is an optical module sending data in a continuous mode. Further, a method for data communication based on the Passive Optical Network includes: sending data by using an optical module sending data in a continuous mode; receiving the data by an optical module based on a set optical power threshold of data “0” and a set optical power threshold of data “1”.
    Type: Grant
    Filed: June 12, 2007
    Date of Patent: July 6, 2010
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Jun Zhao, Jiang Feng, Nanling Li, Peilong Tan, Yu Liu, Chuanhai Huang, Wensheng Wu, Guangxiang Yang, Yong He, Wenwen Dong
  • Publication number: 20100158524
    Abstract: Provided is an upstream source light generator of a passive optical network (PON) system. The upstream source light generator includes an amplification part configured to amplify injection light, and a reflection part configured to receive the amplified injection light and generate reflection light by reflecting the amplified injection light with different optical delays according to wavelengths of the amplified injection light.
    Type: Application
    Filed: August 18, 2009
    Publication date: June 24, 2010
    Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Oh-Kee KWON, Yongsoon Baek, Chul-Wook Lee, Jong-Hoi Kim, Eundeok Sim, Dong-Hun Lee
  • Patent number: 7734178
    Abstract: In a PON system by WDM, IP broadcast can be received without oppressing a band used by a user for Internet communication. An OLT provides a first wavelength received in common by respective ONUs and plural second wavelengths by which the OLT and the respective ONUs perform communication individually. With respect to signals in the downstream direction, each of the OLTs includes a transmitter to transmit the first wavelength and plural transmitters to transmit the second wavelengths used for the individual communication with the respective ONUs. Each of the ONUs includes a receiver to receive the first wavelength and a receiver to receive the second wavelength used in the ONU itself. The OLT transmits data of the IP broadcast by the first wavelength and transmits individual data of each of the ONUs by the second wavelength corresponding to the ONU.
    Type: Grant
    Filed: July 16, 2007
    Date of Patent: June 8, 2010
    Assignee: Hitachi, Ltd.
    Inventors: Kenichi Sakamoto, Tohru Kazawa
  • Patent number: 7734179
    Abstract: A communication system between head-ends and end-users is provided which expands bandwidth and reliability. A concentrator receives communication signals from a head-end and forwards the received communication signals to one or more fiber nodes and/or one or more mini-fiber nodes. The concentrator demultiplexes/splits received signals for the mini-fiber nodes and the fiber nodes and forwards demultiplexed/split signals respectively. The mini-fiber nodes may combine signals received from the head-end with loop-back signals used for local medium access control prior to forwarding the signals to the end-users. Upstream data are received by the mini-fiber nodes and/or fiber node and transmitted to the concentrator. The concentrator multiplexes/couples the mini-fiber node and the fiber node upstream signals and forwards multiplexed/coupled signals to the head-end.
    Type: Grant
    Filed: August 13, 2003
    Date of Patent: June 8, 2010
    Assignee: AT&T Corp.
    Inventors: Thomas Edward Darcie, Bhavesh N. Desai, Alan H. Gnauck, Xiaolin Lu, Sheryl Leigh Woodward
  • Patent number: 7725039
    Abstract: To automatically discover the port connections for all nodes in a network, a master node generates a predetermined optical signal and transmits the predetermined optical signal to a neighboring node, which signal identifies the port on which the master node transmitted the predetermined signal. The recipient transmits a reply signal to the predecessor node and to the master node via a control channel, which identifies a port on which the predetermined optical signal was received by the neighboring node. By successively repeating this process in a methodical manner, the master node can discover all of the port interconnections in the optical network. Also each node can discover all its port interconnections to its neighbors. Moreover, by selecting controlling the state (e.g., terminate, open) of the ports of the non-master nodes in the network, the master node can control which nodes receive the predetermined signal, thereby ensuring proper port discovery.
    Type: Grant
    Filed: July 18, 2001
    Date of Patent: May 25, 2010
    Assignee: Meriton Networks US Inc.
    Inventors: Murali Krishnaswamy, Jefferson L. Wagener, Xiaowen Mang
  • Patent number: 7725028
    Abstract: A system and method for simultaneous delivery of a plurality of independent blocks of 500 MHz digital broadcast television services, stacking a plurality of RF blocks on a plurality of spectrally sliced WDM optical bands.
    Type: Grant
    Filed: September 17, 2007
    Date of Patent: May 25, 2010
    Assignee: AT&T Intellectual Property I, LP
    Inventors: Martin Birk, Patrick P. Iannone, Kenneth C. Reichmann, Nicholas J. Frigo, Cedric F. Lam
  • Patent number: 7706688
    Abstract: The invention provides a unified optical network architecture for metro and access communication networks, wherein a metro ring network interfaces access PONs through one or more reconfigurable Optical Add/Drop Multiplexers to provide wavelength-reconfigurable all-optical transmission of communication signals from the metro ring network to designated optical network units associated with the end-users, and wherein one metro hub located in the metro ring network is utilized to set transmission wavelengths and timing for both downstream and upstream signal transmission for multiple access PONs.
    Type: Grant
    Filed: July 16, 2007
    Date of Patent: April 27, 2010
    Assignee: University of Ottawa
    Inventors: Francois Boudreault, Hanan Anis, S. Richard Pramod
  • Patent number: 7689123
    Abstract: A method and system includes at least one interconnect hub, connecting the at least one interconnect hub to a plurality of audio connection devices to form a network of audio connection devices with the interconnect hub at the center of the ring. The audio connection devices are connected to each other through the at least one interconnect hub, and data is synchronously transmitted between at least two of the audio connection devices through the at least one interconnect hub.
    Type: Grant
    Filed: October 26, 2007
    Date of Patent: March 30, 2010
    Assignee: L-3 Communications Integrated Systems L.P.
    Inventor: Steven E. Parker
  • Patent number: 7684703
    Abstract: There is provided a wavelength division multiplexing transmission system and apparatuses used therein, in which a remote apparatus to be newly added to a station apparatus autonomously sets a wavelength to be used in the remote apparatus, thereby avoiding the need for presetting a wavelength to be used in the remote apparatus. The remote apparatus includes wavelength determining means that determines an available wavelength on the basis of an optical signal received from the station apparatus. The wavelength determining means may determine the wavelength of an unreceived optical signal as the available wavelength or may determine the wavelength of a received optical signal as the available wavelength, and may set that wavelength as a transmission and reception wavelength to be used in the remote apparatus.
    Type: Grant
    Filed: March 10, 2004
    Date of Patent: March 23, 2010
    Assignee: NEC Corporation
    Inventor: Shigekazu Harada
  • Patent number: 7680414
    Abstract: A Passive Optical Network system implementing a parent station capable of receiving high-speed burst signals transmitted from a plurality of subsidiary stations to a parent station, with excellent bandwidth utilization efficiency in the link from the stations to the parent. The system is provided with a configuration in which, when launched or an addition of a new subsidiary station, the parent stores threshold values appropriate for the received signals on the basis of the strength of the received signal for each subsidiary station, from among a plurality of preset threshold value candidates, and in response to the parent station's sending of a transmission grant with respect to each subsidiary station each time the subsidiary station transmitting optical signals changes, the stored threshold value corresponding to the subsidiary station is set in the receiver circuit.
    Type: Grant
    Filed: May 30, 2007
    Date of Patent: March 16, 2010
    Assignee: Hitachi Communication Technologies, Ltd.
    Inventors: Tohru Kazawa, Masaki Ohira, Yusuke Yajima
  • Patent number: 7680416
    Abstract: A wavelength division multiplexed-passive optical network includes an optical line terminal for generating downstream optical signals of discrete wavelengths and for receiving upstream optical signals of discrete wavelengths, a remote node, coupled to the optical line terminal, a wavelength division unit settled to reflect a predetermined wavelength, and a plurality of optical network units. Each optical network unit has an optical source which is oscillated in a multi-mode and is self-injection locked by the predetermined wavelength provided thereto, thereby to generate the upstream optical signal in a single mode to be provided to the remote node.
    Type: Grant
    Filed: December 30, 2004
    Date of Patent: March 16, 2010
    Assignee: Kwangju Institute of Science and Technology
    Inventors: Swook Hann, Chang Soo Park
  • Publication number: 20100061729
    Abstract: A system and method for optical transmission that provides an efficient manner of increasing transmission capacity, especially in the downstream direction, with minimal changes to existing components. An optical network node includes an optical transmitter, a plurality of optical media access controllers, and a bit interleaver for interleaving the output of each of the plurality of optical media access controllers into a single bit stream and providing the bit stream to the optical transmitter. In operation, the optical network node, which may be an OLT, thereby is capable of transmitting at a rate equal to the sum of the output rates of the individual media access controllers. A corresponding deinterleaver in a receiving node, such as an ONT, separates the interleaved bit stream into its constituent bit streams, one or more of which may be selected for use in the receiving device.
    Type: Application
    Filed: September 2, 2009
    Publication date: March 11, 2010
    Inventor: William B. Weeber
  • Patent number: 7676156
    Abstract: Light carrying information for access terminals is carried via optical fibers. Information for terminals from groups is multiplexed over different time-slots and different communication wavelengths of the light in the fiber for a group. The information is passed between the fibers and the transport network via transceivers. The use of the transceivers is multiplexed between the optical fibers. Each transceiver passes information for selectable light guides at selectable communication wavelengths in different timeslots.
    Type: Grant
    Filed: June 21, 2002
    Date of Patent: March 9, 2010
    Assignee: Alcatel-Lucent USA Inc.
    Inventor: Jeroen Wellen
  • Patent number: 7664406
    Abstract: An OLT in a WDM-PON may include a main board and a sub board. The main board may include a master optical transmitting/receiving control/supervising section and the sub board may include a plurality of optical transceivers and a slave optical transmitting/receiving control/supervising section. The master optical transmitting/receiving control/supervising section may produce a data input signal and a data read-control signal for controlling the plurality of optical transceivers of the sub board. The slave optical transmitting/receiving control/supervising section may receive the data input signal and the data read-control signal, and read the data input signal in accordance with the read-control signal. The optical transceivers may be controlled based on the data input signal.
    Type: Grant
    Filed: September 11, 2006
    Date of Patent: February 16, 2010
    Assignee: LG-Nortel Co., Ltd.
    Inventor: Seung Joo Hong
  • Patent number: 7657330
    Abstract: A system and method for providing a network that includes at least two microprocessor-controlled devices that include a first microprocessor-controlled device and a distinct second microprocessor-controlled device, and at least two bi-directional fiber optic cables to provide a communicative ring amongst the at least two microprocessor controlled devices by connecting the at least two microprocessor-controlled devices in a daisy-chain, where the first microprocessor-controlled device and the distinct second microprocessor-controlled device communicate via at least two of the bi-directional fiber optic cables.
    Type: Grant
    Filed: February 24, 2003
    Date of Patent: February 2, 2010
    Assignee: Parker-Hannifin Corporation
    Inventor: Brian D. Morrison
  • Patent number: 7646979
    Abstract: A system for simultaneously transmitting and receiving multiple data messages on a unidirectional ring having a plurality of nodes coupled thereto is described. This technique utilizes a medium access (MAC) protocol for a multi-gigabit-per-second local-area optical wavelength division multiplexed (WDM) network that is particularly well suited for high-performance computing environments that need a network that provides quality of service and the ability to enforce service level agreements. The protocol uses an asynchronous, unslotted, tokenless, and collision-free access scheme that is arbitrated by a centralized scheduler. The embodiment is based on a folded-bus unidirectional ring that is passively optically tapped by the nodes to both transmit data onto the network and to receive data from the network.
    Type: Grant
    Filed: November 26, 2001
    Date of Patent: January 12, 2010
    Assignee: NetApp, Inc.
    Inventors: Gene Ciancaglini, Steven Lumetta, Muriel Medard, John D. Moores, Salil A. Parikh, Mark R. Parquette
  • Patent number: 7630638
    Abstract: Shared optical carrier sources for the OLT's are provided. An apparatus comprises a plurality of optical carrier generators, each optical carrier generator outputting an optical carrier at a different wavelength, an optical multiplexer operable to combine the plurality of optical carriers to form a wave division multiplexed optical carrier, and an optical power splitter having a plurality of outputs, each output connectable to an optical line termination unit, the optical power splitter operable to split the wave division multiplexed optical carrier to form a plurality of wave division multiplexed optical carriers.
    Type: Grant
    Filed: December 29, 2004
    Date of Patent: December 8, 2009
    Assignee: Fujitsu Limited
    Inventor: Stephen J. Brolin
  • Patent number: 7627246
    Abstract: Wavelength division multiplexing (“WDM”) passive optical networks (“PON”) to transport signals having various access platforms are described. For one embodiment, a WDM PON performs bi-directional communications, and includes an interface. The interface transfers one or more signals having a first platform to a WDM-PON data transmission platform at an access point of a network to propagate through a single transmission medium, to one or more remote distribution nodes in between a Central Office and an optical network unit. The single transmission medium carries three or more optical channels traveling in both directions.
    Type: Grant
    Filed: July 22, 2005
    Date of Patent: December 1, 2009
    Assignee: Novera Optics, Inc.
    Inventors: Wayne V. Sorin, Bernd Hesse
  • Patent number: 7627248
    Abstract: A method for pre-emphasising transmitted signals in channels for multiplex signals along a transmission path comprising supply and/or branch points is provided. According to the method, relative degradations of the signal-to-noise intervals between transmitted signals via any category or group of channels—i.e. express and add or drop channels or add-drop channels are taken into account. A point-to-point link and for transparent optical networks may be used. To this end, the average signal powers of different channel groups are set relative to one another in order to obtain predetermined signal-to-noise intervals for each group. In addition, the signal-to-noise intervals within a channel group are equalized at their termination points. Regulation protocols for controlling the pre-emphasising steps are provided.
    Type: Grant
    Filed: May 3, 2004
    Date of Patent: December 1, 2009
    Assignee: Nokia Siemens Networks GmbH & Co KG
    Inventors: Wolfgang Peisl, Lutz Rapp
  • Patent number: 7623786
    Abstract: The present invention is generally drawn to optical network architecture that can include a multi-subscriber optical interface that can service a plurality of subscribers that are located in close proximity relative to one another. For example, the multi-subscriber optical interface can service multiple dwelling units such as an apartment complex that has many different subscribers to the optical network system. Further, the invention can also service subscribers over the same optical waveguide who may have different bandwidth needs, such as businesses, personal/home users and the like.
    Type: Grant
    Filed: April 5, 2007
    Date of Patent: November 24, 2009
    Assignee: Enablence USA FTTX Networks, Inc.
    Inventors: Paul F. Whittlesey, Emmanuel A. Vella, James O. Farmer