Ring Or Loop Patents (Class 398/59)
  • Patent number: 10334499
    Abstract: The present disclosure is a novel utility of a software defined radio (SDR) based Distributed Antenna System (DAS) that is field reconfigurable and support multi-modulation schemes (modulation-independent), multi-carriers, multi-frequency bands and multi-channels. The present invention enables a high degree of flexibility to manage, control, enhance, facilitate the usage and performance of a distributed wireless network such as Flexible Simulcast, automatic traffic load-balancing, network and radio resource optimization, network calibration, autonomous/assisted commissioning, carrier pooling, automatic frequency selection, frequency carrier placement, traffic monitoring, traffic tagging, pilot beacon, etc. As a result, a DAS in accordance with the present invention can increase the efficiency and traffic capacity of the operators' wireless network.
    Type: Grant
    Filed: August 9, 2018
    Date of Patent: June 25, 2019
    Assignee: Dali Wireless, Inc.
    Inventors: Shawn Patrick Stapleton, Paul Lemson, Bin Lin, Albert S. Lee
  • Patent number: 10263703
    Abstract: The optical transceiver module installable on the Master Unit side of a DAS system connectable to a plurality of Remote Units, comprises an uplink connector and a downlink connector connectable to a radio base station, first and second optical connectors connectable to the Remote Units, a downlink path for the connection between the downlink connector and the first and second optical connector, and an uplink path for the connection between the uplink connector and the first and second optical connectors, wherein the uplink path comprises a first coupler of the WDM type and a second coupler of the WDM type connected, respectively, to the first optical connector and to the second optical connector, and wherein the uplink path comprises first and second demultiplexers connected, respectively, to the outputs of the first coupler and of the second coupler and adapted to separate the optical signals coming from the Remote Units.
    Type: Grant
    Filed: July 13, 2017
    Date of Patent: April 16, 2019
    Assignee: Teko Telecom S.r.l.
    Inventor: Massimo Notargiacomo
  • Patent number: 10243823
    Abstract: One embodiment is a method including configuring a first network element of a fiber channel (“FC”) network as a generator element, wherein the generator employs a link diagnostic protocol to cause a second network element comprising a peer of the first network element as a reflector element, wherein the first and second elements are connected via a link; entering a first diagnostic phase, wherein in the first diagnostic phase, diagnostic capabilities of the first and second elements are determined; and subsequent to completion of the first diagnostic phase, entering a second diagnostic phase in which a deep loopback test is performed, wherein the deep loopback test comprises a frame level loopback test for exposing an issue in a path between the first and second network elements beyond a Media Access Control (“MAC”) layer.
    Type: Grant
    Filed: February 24, 2017
    Date of Patent: March 26, 2019
    Assignee: CISCO TECHNOLOGY, INC.
    Inventors: Harsha Bharadwaj, Nagendran Venugopalan
  • Patent number: 10206018
    Abstract: A transmission method and system for an optical burst transport network are disclosed in the present document. The method includes: acquiring a topology of a mesh OBTN network, and generating one or more logical sub-networks according to the topology of the mesh OBTN network; a predetermined master node in the mesh OBTN network updating bandwidth maps for all logical sub-networks; the predetermined master node is a node, which all control channels pass through, in all the nodes of the mesh OBTN network.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: February 12, 2019
    Assignee: XI'AN ZHONGXING NEW SOFTWARE CO., LTD
    Inventor: Xun Chen
  • Patent number: 10003427
    Abstract: A bidirectional optical element in optical network units (ONUs) of a passive optical network (PON) includes a main filter configured to pass an upstream signal having an upstream-channel wavelength and a downstream signal having a downstream-channel wavelength, a drop filter configured to pass the downstream signal having the downstream-channel wavelength and reject the upstream signal having the upstream-channel wavelength, and an add filter configured to pass the upstream signal having the upstream-channel wavelength and reject the downstream signal having the downstream-channel wavelength, wherein the main filter, the drop filter, and the add filter are configured to share a single optical waveguide, and the optical waveguide is configured to connect input ports of the main filter and the drop filter and an output port of the drop filter and is provided in a straight line shape.
    Type: Grant
    Filed: July 3, 2017
    Date of Patent: June 19, 2018
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Heuk Park, Hwan Seok Chung
  • Patent number: 9826508
    Abstract: A remote radio head unit (RRU) system for achieving high data rate communications in a Distributed Antenna System is disclosed. The Distributed Antenna System is configured as a Neutral Host enabling multiple operators to exist on one DAS system. The present disclosure enables a remote radio head unit to be field reconfigurable and support multi-modulation schemes (modulation-independent), multi-carriers, multi-frequency bands and multi-channels. As a result, the remote radio head system is particularly suitable for wireless transmission systems, such as base-stations, repeaters, and indoor signal coverage systems.
    Type: Grant
    Filed: September 8, 2014
    Date of Patent: November 21, 2017
    Assignee: Dali Systems Co. Ltd.
    Inventors: Paul Lemson, Shawn Patrick Stapleton, Sasa Trajkovic
  • Patent number: 9736559
    Abstract: A mini-optical line termination (OLT) includes at least one management card for providing control and management functions. A plurality of network cards having a predetermined number of ports are configured to support a predetermined number of subscribers by providing a gigabit passive optical network to the subscribers. At least one network device is coupled to an upstream device and the plurality of network cards. The at least one network device is configured to control the forwarding of data between the upstream device and the subscribers.
    Type: Grant
    Filed: August 21, 2015
    Date of Patent: August 15, 2017
    Assignee: Cox Communications, Inc.
    Inventor: Timothy Kai-Loh Chia
  • Patent number: 9660758
    Abstract: The invention relates to an optical communication network (1) comprising a plurality of nodes (2) connected to each other by means of optical fibers (3) in a ring structure, wherein optical signals are transported at working wavelengths (?w) in a first direction in said ring structure and wherein optical signals are transported at protection wavelengths (?p) in a second direction that is opposite to the first direction in said ring structure, wherein for each node (2) at least one wavelength assignment table (WAT) is provided, wherein to each working wavelength (?w) a corresponding protection wavelength (?p) is assigned, wherein in case of a detected connection failure in said ring structure each node (2) which loses at least one connection performs for all working wavelengths (?w) affected by said connection failure a lookup in its wavelength assignment table (WAT) to determine the respective protection wavelength (?p) and tunes lasers of transceiver units to the determined protection wavelengths (?p).
    Type: Grant
    Filed: February 16, 2011
    Date of Patent: May 23, 2017
    Assignee: ADVA OPTICAL NEWTORKING SE
    Inventor: Klaus Grobe
  • Patent number: 9503193
    Abstract: A method of configuring an optical network terminal (ONT) at a computer terminal is described. The method may include reading in an instruction including a persistent identifier and an ONT command, identifying the ONT within a database using the persistent identifier, packaging an optical communication command to be sent through an optical line terminal (OLT) using the ONT identified by the persistent identifier through the database, and sending the optical communication command to the ONT through the OLT. The instruction may be operable to configure the ONT. Identifying the ONT may include referencing the persistent identifier against a table including standard transient ONT identifiers stored within the database. The OLT may be optically coupled to the ONT using a passive optical networking.
    Type: Grant
    Filed: November 16, 2014
    Date of Patent: November 22, 2016
    Inventors: Pook-Ping Yao, Byron Thom, Daniel Ronald
  • Patent number: 9467244
    Abstract: A transmission apparatus includes: a first output unit configured to generate a first optical signal of which a first wavelength is variable and control the first wavelength to be close to a second wavelength of a second optical signal transmitted as a multiplexed optical signal with the first optical signal, the first output unit outputting the first optical signal to another transmission apparatus; and a second output unit configured to generate a third optical signal that is replication of the first optical signal in a wavelength band opposite to the first wavelength across the second wavelength, the second output unit outputting the third optical signal to the another transmission apparatus, wherein the first output unit stops outputting the first optical signal when the another transmission apparatus switches an optical signal to be received from the first optical signal to the third optical signal.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: October 11, 2016
    Assignee: FUJITSU LIMITED
    Inventors: Ichiro Nakajima, Kazuaki Nagamine
  • Patent number: 9455870
    Abstract: Systems and methods of configuring a computer network are provided. N network nodes can each form M communication links with other network nodes. A number of communication links equal to the largest integer not greater than the quotient of M divided by (N?1) can be assigned between each pair of network nodes. The remaining communication links can be assigned such that a graph represented by the network nodes and communication links is substantially geometrically symmetric.
    Type: Grant
    Filed: June 19, 2013
    Date of Patent: September 27, 2016
    Assignee: Google Inc.
    Inventors: Abdul Kabbani, Amin Vahdat
  • Patent number: 9445166
    Abstract: A method may include determining, by a device, a wavelength identifier graph corresponding to an optical network based on a set of lightpath conflicts, for a set of optical signals, associated with a set of links and a set of nodes of the optical network. One or more optical signals may be associated with transmission via a super-channel. The method may further include selectively assigning, by the device, a wavelength identifier to an optical signal, of the set of optical signals, based on the wavelength identifier graph. The wavelength identifier being associated with a set of wavelength identifiers and corresponding to a wavelength of a set of wavelengths. The method may further include causing, by the device, the optical signal to utilize the wavelength, of the set of wavelengths, for transmission via the optical network.
    Type: Grant
    Filed: December 30, 2014
    Date of Patent: September 13, 2016
    Assignee: Infinera Corporation
    Inventors: Steven Joseph Hand, Onur Turkcu, Sudhindra Aithal Kota, Nitin K. Goel, Marco E. Sosa
  • Patent number: 9344187
    Abstract: Apparatus for enabling an M:N recovery scheme in an optical network includes a set of N working DSP-enabled optical transceivers/transponders including at least one working DSP-enabled optical transceiver/transponder that uses a first set of transmission parameters and at least one working DSP-enabled optical transceiver/transponder that uses a second set of transmission parameters which is different from the first set of transmission parameters, and a set of M protection DSP-enabled optical transceivers/transponders operable to protect the set of N working DSP-enabled optical transceivers/transponders and including L protection DSP-enabled optical transceivers/transponders, each having a capability of using a set of adjustable transmission parameters enabling it to protect every one of the N working DSP-enabled optical transceivers/transponders, and, when M>L, M?L protection DSP-enabled optical transceivers/transponders, each having a capability of protecting at least one, but not all, of the N working DS
    Type: Grant
    Filed: September 17, 2013
    Date of Patent: May 17, 2016
    Inventor: Doron Handelman
  • Patent number: 9258076
    Abstract: A laser system includes an array of lasers that emit light at a number of different, fixed wavelengths. A group of optical transport systems connect to the laser system. Each of the optical transport systems is configured to modulate data signals onto the light from the laser system to create optical signals and transmit the optical signals on one or more optical fibers.
    Type: Grant
    Filed: June 22, 2015
    Date of Patent: February 9, 2016
    Assignee: Juniper Networks, Inc.
    Inventor: Pradeep S. Sindhu
  • Patent number: 9246628
    Abstract: Provided is a hybrid passive optical network (PON) system. The hybrid PON system of wavelength division multiplexing (WDM)/time division multiplexing (TDM) may include an optical line terminal (OLT) and an optical network unit (ONU). The OLT and the ONU may transmit a signal based on wavelength reuse using a seed light source and a reflective modulator. The light source may include a seed light source having a single wavelength, two seed light sources having different wavelength bands, and a light source having a wavelength tunable characteristic.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: January 26, 2016
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Seung-Hyun Cho, Jie Hyun Lee, Seung Il Myong, Sang Soo Lee, Jong Hyun Lee, Eui Suk Jung, Kwang Ok Kim
  • Patent number: 9197353
    Abstract: Provided is an OLT including a wavelength splitter that splits all upstream optical signals with different wavelengths received from at least one ONU according to wavelength, at least one receiver that receive the optical signals split by the wavelength splitter according to wavelength, a wavelength selector that allocates an upstream transmission wavelength of the at least one ONU, and a transmitter that transmits wavelength allocation information allocated by the wavelength selector to the at least one ONU.
    Type: Grant
    Filed: September 26, 2013
    Date of Patent: November 24, 2015
    Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTE
    Inventors: Dong-Soo Lee, Sung-Chang Kim, Geun-Yong Kim, Hark Yoo, Young-Suk Lee
  • Patent number: 9178613
    Abstract: Techniques are disclosed that relate to synchronizing a clock on a network interface device with a clock on an optical line terminal (OLT). In one example, the technique to synchronizing the clocks may include monitoring one or more instances when the network interface device transmits information to the OLT and determining when a frame should be received by the network interface device based on the monitored one or more instances when the network interface device transmits information the OLT.
    Type: Grant
    Filed: December 9, 2013
    Date of Patent: November 3, 2015
    Assignee: Calix, Inc.
    Inventors: Christopher T. Bernard, Dean M. Dunnigan
  • Patent number: 9124517
    Abstract: In a network system in which a switch forwarding packets and a control server determining route information are separated, it is desired to achieve a redundancy of the control channel by an out-of-band control channel and an in-band control channel, when the switch receives a control message regarding the flow entry registration and the like based on the route information from the control server. Specifically, the separated switch and control server are connected by a control channel for sending and receiving the control message. The switch is not only connected to a control server via an out-of-band control channel by a route dedicated to the control message, but also connected to another control server via an in-band control channel by a route which is common with a normal data communication for determining the route information, to achieve a redundancy of the control channel.
    Type: Grant
    Filed: January 4, 2011
    Date of Patent: September 1, 2015
    Assignee: NEC Corporation
    Inventors: Minaxay Philavong, Masanori Takashima, Youichi Hidaka, Tetsu Izawa, Shihomi Sato
  • Patent number: 9118983
    Abstract: A mini-optical line termination (OLT) includes at least one management card for providing control and management functions. A plurality of network cards having a predetermined number of ports are configured to support a predetermined number of subscribers by providing a gigabit passive optical network to the subscribers. At least one network device is coupled to an upstream device and the plurality of network cards. The at least one network device is configured to control the forwarding of data between the upstream device and the subscribers.
    Type: Grant
    Filed: June 3, 2010
    Date of Patent: August 25, 2015
    Assignee: COX COMMUNICATIONS, INC.
    Inventor: Timothy Kai-Loh Chia
  • Patent number: 9054796
    Abstract: In an embodiment, a dual optical-electrical conversion (DOEC) module is described that includes an optical host interface, an optical network interface, and an integrated circuit. The optical host interface includes an optical transmitter and an optical receiver. The optical network interface includes an optical transmitter and an optical receiver. The integrated circuit conditions electrical signals communicated between the optical host interface and optical network interface. Optical signals received at and transmitted by the optical host interface may have different parameter requirements than optical signals received at and transmitted by the optical network interface, such as different wavelength parameters and/or fiber link length parameters.
    Type: Grant
    Filed: November 15, 2012
    Date of Patent: June 9, 2015
    Assignee: FINISAR CORPORATION
    Inventor: Giuliano Coli
  • Patent number: 9031092
    Abstract: A computer system and method for transmitting LAN signals over transport systems. LAN signals are generated in any client LAN compliant interface. A transceiver receives the client LAN signal in the LAN format. The client LAN signals are not converted to a SONET transmission format at any time before reaching the transceiver. The transceiver then converts the client LAN signal to an internal electrical LAN signal before re-clocking the internal electrical LAN signal. The re-clocked internal electrical LAN signal is then re-modulated into a second LAN signal. The second LAN signal is then transmitted to a transport system.
    Type: Grant
    Filed: November 12, 2013
    Date of Patent: May 12, 2015
    Assignee: Pivotal Decisions LLC
    Inventors: Jeffrey Lloyd Cox, Samir Satish Sheth
  • 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: 9008501
    Abstract: Disclosed herein are optical distribution networks and corresponding methods for providing physical-layer redundancy. Example embodiments include a head-end passive optical splitter-combiner (OSC) to split optical signals from an Optical Line Terminal (OLT) onto primary and secondary optical paths for redundant distribution to optical network terminal(s) (ONTs), a passive access OSC for tapping the redundant signals, and an optical switch for selecting between the redundant signals and providing an ONT access to the selected signal. Example optical distribution networks and corresponding methods provide multiple drop points, a fully cyclical path, and autonomous protection switching, all at low cost. A further advantage of these networks and methods is that where faults may occur, maintenance may not be required for a certain time.
    Type: Grant
    Filed: February 13, 2013
    Date of Patent: April 14, 2015
    Assignee: Tellabs Bedford, Inc.
    Inventor: Craig L. Lutgen
  • Publication number: 20150063807
    Abstract: A data transmission system (200) comprises: a main optical packet ring (201) comprising a plurality of separate packet transmission channels; and a plurality of secondary optical packet rings (202) interconnected through the main optical packet ring. Each of the secondary optical packet rings (202) comprises a plurality of nodes (400). Each of said packet transmission channels of the main optical packet ring (201) is connected to a different node of each secondary optical packet ring (202), respectively.
    Type: Application
    Filed: April 24, 2013
    Publication date: March 5, 2015
    Inventors: Christian Simonneau, Yvan Pointurier
  • Patent number: 8965197
    Abstract: A node device in an optical transport ring network including plural node devices connected in a ring form using plural optical transmission paths so that optical transport frames of a working line and a protection line are transmitted using the plural optical transmission paths, includes a control information transmitter, when a failure occurs in the optical transmission paths, transmitting the optical transport frame to an opposing node device as a transmission destination node in the optical transmission paths, the optical transport frame including switching control information; and a switcher receiving the optical transport frame including switching control information, the optical transport frame being transmitted to the node device as the transmission destination node, forming a loop back to fold a transmission path between the plural optical transmission paths, and switching the optical transmission path from the work line to the protection line.
    Type: Grant
    Filed: June 25, 2012
    Date of Patent: February 24, 2015
    Assignee: Fujitsu Limited
    Inventors: Katsuhiro Shirai, Koji Takeguchi, Takashi Honda, Masahiro Shioda
  • Patent number: 8948593
    Abstract: An optical network interconnect device interconnects a first WDM network for transmitting a WDM optical signal with first wavelength spacing and a second WDM network for transmitting a WDM optical signal with second wavelength spacing that is wider than the first wavelength spacing. The optical network interconnect device includes a filter to remove a wavelength component which is not used in the second WDM network from an WDM optical signal transferred from the first WDM network to the second WDM network.
    Type: Grant
    Filed: July 8, 2011
    Date of Patent: February 3, 2015
    Assignee: Fujitsu Limited
    Inventor: Hiroki Ooi
  • Patent number: 8929738
    Abstract: Embodiments herein include a resilient add-drop module for use in one of multiple access subnetwork nodes forming an access subnetwork ring. The module comprises a dual-arm passive optical filter and a cyclic arrayed waveguide grating (AWG). The dual-arm passive optical filter is configured to resiliently drop any wavelength channels within a fixed band uniquely allocated to the access subnetwork node from either arm of the access subnetwork ring and to resiliently add any wavelength channels within the fixed band to both arms of the access subnetwork ring. The cyclic AWG is correspondingly configured to demultiplex wavelength channels dropped by the dual-arm filter and to multiplex wavelength channels to be added by the dual-arm filter. Configured in this way, the module in at least some embodiments advantageously reduces the complexity and accompanying cost of nodes in an optical network, while also providing resilience against fiber and node failures.
    Type: Grant
    Filed: May 30, 2012
    Date of Patent: January 6, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Stefan Dahlfort, Ming Xia
  • Publication number: 20140355983
    Abstract: An electronic circuit device, including a combined optical transmission and cooling fluid conduit network. The network includes at least one cooling conduit having an optical transmission medium. The network is configured to convey a cooling fluid via the at least one cooling conduit and to convey an electromagnetic signal via the optical transmission medium. The network is in thermal communication with a first set of one or more components of the electronic circuit device and in signal communication with a second set of one or more components of the electronic circuit device. The first set and second set of components are at least partly overlapping. A method for conveying optical signal in such an electronic circuit device is also provided.
    Type: Application
    Filed: May 27, 2014
    Publication date: December 4, 2014
    Applicant: INTERNATIONAL BUSINESS MACHINES CORPORATION
    Inventors: Mircea Gusat, Bruno Michel, Thomas E. Morf, Sebastien Ragot, Maria Soimu
  • Patent number: 8897642
    Abstract: The invention relates to a remote node architecture for a fiber-optic network, especially for low bit-rate data transmission, the fiber-optic network comprising a central node and a plurality of remote nodes serially connected to each other or to the central node, respectively, the central node and the remote node being capable of communicating by means of digital optical signals created by the central node or a respective remote node, each digital optical signal comprising a data frame.
    Type: Grant
    Filed: December 13, 2011
    Date of Patent: November 25, 2014
    Assignee: ADVA AG Optical Networking
    Inventors: Klaus Grobe, Henning Hinderthur
  • Patent number: 8897643
    Abstract: A node (260, 50) for a multi-token optical communications network has optical channels between the node and other nodes, each channel having a token (T1, T2, T3), passed between nodes, to indicate that a corresponding optical channel is available for transmission during a token holding time. The node has a transmitter (280) for transmitting packets over the optical channels, a buffer (170, 270) for queuing packets before transmission, and a transmit controller (170, 290) configured to control the buffer to forward an initial packet or packets from the buffer to the transmitter once a token has been received. The transmit controller determines how much of the token holding time remains after the transmission of the initial packet or packets, and then controls the buffer to forward a further packet according to the remaining token holding time. A maximum packet delay can be reduced where there is asymmetric traffic. A token holding time can be different for different nodes.
    Type: Grant
    Filed: March 25, 2010
    Date of Patent: November 25, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Pier Giorgio Raponi, Nicola Andriolli, Piero Castoldi, Marzio Puleri
  • Patent number: 8855489
    Abstract: Communications method between a main station and processing nodes includes interconnecting the main station and the nodes in an optical path defining adjacent nodes and non-adjacent nodes, operatively grouping the nodes in a plurality of distinct sub-groups, each formed by non-adjacent nodes, at least one of said sub-groups including at least two nodes generating at the main station a multiplexed optical signal propagating along the path for serving the nodes, the multiplexed optical signal including a plurality of optical channel signals having a respective plurality of distinct carrier wavelengths, each carrier wavelength being associated with a respective sub-group of nodes, and serving each node of each sub-group of nodes with a respective portion of the optical channel signal having the associated carrier wavelength.
    Type: Grant
    Filed: October 25, 2004
    Date of Patent: October 7, 2014
    Assignee: Telecom Italia S.p.A.
    Inventors: Mauro Boldi, Alberto Rossaro, Roberto Quasso, Sara Gabba
  • Patent number: 8842988
    Abstract: Data center network architectures, systems, and methods that can reduce the cost and complexity of data center networks. Such data center network architectures, systems, and methods employ physical optical ring network topologies, optical nodes, and optical junction nodes to efficiently allocate bandwidth within the data center networks, while reducing the overall physical interconnectivity requirements of the data center networks.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: September 23, 2014
    Assignee: Plexxi Inc.
    Inventors: Derek E. Spock, Richard A. Barry, David J. Husak, Peter B. Everdell, Ruoding Li
  • Patent number: 8817589
    Abstract: Methods and apparatus for line coding in a communications network are described. According to one embodiment of the invention, downstream communications traffic bits are received and mapped into downstream bit positions of a transmission structure. A pre-selected bit in each upstream bit positions of the transmission structure is provided to form a downstream transmission structure. A downstream optical signal carrying the downstream transmission structure is generated for transmission. Upstream communications traffic bits are also received and mapped into the upstream bit positions of the transmission structure to form an upstream transmission structure. An upstream optical signal carrying the upstream transmission structure is generated for transmission.
    Type: Grant
    Filed: September 16, 2011
    Date of Patent: August 26, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Fabio Cavaliere, Stefan Dahlfort, Luca Giorgi
  • Patent number: 8811818
    Abstract: An optical transmission system comprises a metropolitan core network operated in a wavelength division multiplexing mode and connected via metro connection devices to access connections to optical network terminals connected by means of a passive optical splitter. The metro connection devices contain regenerators and wavelength converters, so that data regeneration takes place between the network terminals and the central management and switching unit. This makes it possible to cover distances around 100 km.
    Type: Grant
    Filed: March 6, 2006
    Date of Patent: August 19, 2014
    Assignee: Adtran GmbH
    Inventors: Stephan Beer, Ansgar Dirkmann, Thomas Nagel
  • Patent number: 8811820
    Abstract: A hub node in a wavelength division multiplexed optical network automatically discovers at least one of new client-side optical ports and new edge-side optical ports. The hub node comprises a wavelength switch network, port discovery equipment, and a controller. The wavelength switch network routes any wavelength channel that does not support a matching pair of client-side and edge-side ports to port discovery equipment at the hub node. The port discovery equipment searches for new ports, and, responsive to finding a new port, automatically discovers a predefined set of one or more attributes of the new port. The controller determines that a client-side port and an edge-side port are a matching pair of ports if discovered sets of attributes of those ports match according to one or more predefined rules. The controller then controls the wavelength switch network to re-route the wavelength channel supporting that matching pair between those ports.
    Type: Grant
    Filed: December 30, 2012
    Date of Patent: August 19, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Stefan Dahlfort, Kim Laraqui, Ming Xia, Peter Öhlén
  • Patent number: 8781330
    Abstract: An optical repeater formed in an optical passive component passively relays an incoming multiplexed optical signal. The repeater has an optical decoder decoding the multiplexed optical signal, and an optical encoder encoding an optical signal from a termination unit connected to the repeater. The repeater further includes a first optical path switch outputting an incoming multiplexed optical signal to the optical decoder and outputting the optical signal delivered from the optical decoder, a second optical path switch outputting the optical signal coming from the first optical path switch to the termination unit, and a third optical path switch outputting the optical signal coming from the second optical path switch to the encoder and outputting the optical signal delivered from the encoder.
    Type: Grant
    Filed: May 30, 2012
    Date of Patent: July 15, 2014
    Assignee: Oki Electric Industry Co., Ltd.
    Inventor: Hideyuki Iwamura
  • Patent number: 8774628
    Abstract: A remote node architecture for a fiber-optic network, especially for low bit-rate data transmission, the fiber-optic network architecture comprises a central node and a plurality of remote nodes serially connected to each other or to the central node, respectively. The central node and the remote nodes are capable of communicating by means of digital optical signals created by the central node or a respective remote node, each digital optical signal comprising a data frame. The remote node comprises an optical connection network, a single transceiver device comprising an optical receiver unit and an optical transmitter unit, and an electronic controller device for controlling the transceiver device. The optical connection network defines a western optical connection port, an eastern optical connection port, an internal optical receiving port being connected to the optical receiver unit and an internal optical transmitting port being connected to the optical transmitter unit.
    Type: Grant
    Filed: December 8, 2011
    Date of Patent: July 8, 2014
    Assignee: ADVA Optical Networking SE
    Inventors: Henning Hinderthür, Klaus Grobe
  • Patent number: 8724992
    Abstract: A ring network system includes a plurality of node apparatuses that are sequentially connected through a transmission medium that is formed in a ring form. In the ring network system, the remaining node apparatuses, except for a first node apparatus of the plurality of node apparatuses pass an optical signal that is transmitted from the first node apparatus, and a second node apparatus corresponding to a destination of the optical signal among the remaining node apparatuses, extracts the optical signal while transferring the first optical signal to a next node apparatus of the second node apparatus.
    Type: Grant
    Filed: September 1, 2010
    Date of Patent: May 13, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Hyun Jae Lee, Hong Ju Kim, Bup Joong Kim, Jea Hoon Yu, Tae Whan Yoo
  • Patent number: 8687961
    Abstract: Various embodiments of the present invention are directed to optical broadcast buses configured with shared optical interfaces for fan-in and fan-out of optical signals. In one aspect, an optical broadcast bus comprises a number of optical interfaces, a fan-in bus optically coupled to the number of optical interfaces, and a fan-out bus optically coupled to the number of optical interfaces. Each optical interface is configured to convert an electrical signal produced by the at least one node into an optical signal that is received and directed by the fan-in bus to the fan-out bus and broadcast by the fan-out bus to the number of optical interfaces. Each optical interface also converts the optical signal into an electrical signal that is sent to the electronically coupled at least one node for processing.
    Type: Grant
    Filed: October 31, 2008
    Date of Patent: April 1, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Michael Renne Ty Tan, Joseph Straznicky, Paul Kessler Rosenberg
  • Patent number: 8682160
    Abstract: A path computation method includes defining photonic constraints associated with a network, wherein the photonic constraints include wavelength capability constraints at each node in the network, wavelength availability constraints at each node in the network, and nodal connectivity constraints of each node in the network, and performing a constrained path computation in the network using Dijkstra's algorithm on a graph model of the network with the photonic constraints considered therein. An optical network includes a plurality of interconnected nodes each including wavelength capability constraints, wavelength availability constraints, and nodal connectivity constraints, and a path computation element associated with the plurality of interconnected photonic nodes, wherein the path computation element is configured to perform a constrained path computation through the plurality of interconnected nodes using Dijkstra's algorithm on a graph model with the photonic constraints considered therein.
    Type: Grant
    Filed: March 15, 2012
    Date of Patent: March 25, 2014
    Assignee: Ciena Corporation
    Inventors: Anurag Prakash, Mohit Chhillar, Marian Trnkus, Waseem Reyaz Khan
  • Patent number: 8638814
    Abstract: A computer system and method for transmitting LAN signals over transport systems. LAN signals are generated in any client LAN compliant interface. A transceiver receives the client LAN signal in the LAN format. The client LAN signals are not converted to a SONET transmission format at any time before reaching the transceiver. The transceiver then converts the client LAN signal to an internal electrical LAN signal before re-clocking the internal electrical LAN signal. The re-clocked internal electrical LAN signal is then re-modulated into a second LAN signal. The second LAN signal is then transmitted to a transport system.
    Type: Grant
    Filed: March 2, 2012
    Date of Patent: January 28, 2014
    Assignee: Pivotal Decisions LLC
    Inventors: Jeffrey Lloyd Cox, Samir Satish Sheth
  • Patent number: 8634715
    Abstract: In accordance with embodiments of the present disclosure, a method for demand aggregation is provided. The method may include routing demands in a ring network such that a length for each routed demand does not exceed a route length maximum, and a load imbalance at each node in the ring network is minimized. The method may also include maximizing optical line card sharing by assigning routed demands sharing common ends to the same wavelength.
    Type: Grant
    Filed: February 7, 2011
    Date of Patent: January 21, 2014
    Assignee: Fujitsu Limited
    Inventors: Xi Wang, Qiong Zhang, Paparao Palacharla, Takao Naito
  • Patent number: 8606101
    Abstract: An optical ring network has one or more working wavelengths and multiple protection wavelengths adapted to support the working wavelength(s). Routing tables may be used in network nodes to assign traffic of a failed working wavelength to a protection wavelength. The protection technique may be applied to networks employing, for example, Dense Wave Division Multiplexing (DWDM).
    Type: Grant
    Filed: April 3, 2013
    Date of Patent: December 10, 2013
    Assignee: Tellabs Operations, Inc.
    Inventors: Eric L. Chan, Matthew S. Vrba
  • Patent number: 8594501
    Abstract: A device receives Long Term Evolution (LTE) architecture information, Internet protocol (IP) network architecture information, and transport network information, and determines traffic patterns of a LTE network based on the LTE architecture information. The device also generates proposed LTE metropolitan optical transport networks (OTNs) based on the determined traffic patterns and one or more of the LTE architecture information, the IP network architecture information, and the transport network information. The device further determines transit switching for the proposed LTE metropolitan OTNs, and selects, from the proposed LTE metropolitan OTNs, a metropolitan OTN optimized for the LTE network.
    Type: Grant
    Filed: December 20, 2010
    Date of Patent: November 26, 2013
    Assignee: Verizon Patent and Licensing Inc.
    Inventors: Deepak Kakadia, Jay Lee, Thomas Tan
  • Patent number: 8577221
    Abstract: The invention provides an optical burst switch in an Optical Burst Switched (OBS) communication network, said optical burst switch comprising means for monitoring and maintaining mesh of virtual optical paths from a communication node to a plurality of other communication nodes, arranged in a ring network, enabling traffic data to be transmitted and/or received between nodes via a physical optical path. The switch also provides means for sending a data packet probe on a virtual path from a node to each other node in the OBS communication network, wherein data packet probe information received at said switch provides information of availability of the physical optical path for sending traffic data between nodes. The switch can be configured such that the rate at which this path monitoring is scheduled guaranteeing less than 50 ms protection switch in the event of monitoring a failed or degraded path.
    Type: Grant
    Filed: November 12, 2010
    Date of Patent: November 5, 2013
    Assignee: Intune Networks Limited
    Inventors: David McDonald, Tom Farrell, Jim Shields, John Courtney
  • Patent number: 8571409
    Abstract: An optical ring network for fixed length messages from a plurality of nodes for transmission to different nodes uses a plurality of wavelengths for transmission, and messages for transmission are ordered and arranged on a per-wavelength basis to minimize a transmit finish time. Each node may be operated in an ADM (add drop multiplexer) mode where an optical node removes information on a particular wavelength and adds information on the same particular wavelength, or each node may be operated in a CDC (colorless, directionless, contentionless) mode where information is assigned to a wavelength according to a selection algorithm which may place it on any wavelength without regard to an original node wavelength. The selection algorithm optimizes selection of messages and wavelengths for transmit finish time.
    Type: Grant
    Filed: November 11, 2011
    Date of Patent: October 29, 2013
    Assignee: Intelligent Fiber Optic Systems, Inc.
    Inventors: Rui Wang, Behzad Moslehi, Richard J. Black
  • Patent number: 8553534
    Abstract: Delivering multicast data traffic over a communication network includes a first network node delivering multicast data traffic to second network nodes. The first and second network nodes are connected by a transmission network in a ring architecture and implement a point-to-multipoint layer 2 protocol. A method includes at the first network node: collecting alarms signals indicative of a failure along the whole ring and of the second network nodes. Based on a current state of the alarm signals, delivering the multicast data traffic either in a first delivery direction along the ring, or in a second delivery direction along the ring opposite to the first delivery direction, or in both the first and second delivery directions. At each of the second network nodes: collecting alarm signals indicative of a failure of the transmission network locally to the second network node and of the second network node.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: October 8, 2013
    Assignee: Telecom Italia S.p.A.
    Inventors: Andrea Allasia, Marco Schiano, Laura Serra, Luigi Varetto
  • Patent number: 8532486
    Abstract: An apparatus comprising a dispersive fiber optical loop for delaying a first and second sideband, relative to each other, of a light modulated by a radio frequency signal to create a pair of pulses, a coupler for tapping a replica of the pair of pulses from the loop; and an auto-correlation module, coupled to the coupler, for correlating the replica of the pair of pulses with each other.
    Type: Grant
    Filed: February 13, 2012
    Date of Patent: September 10, 2013
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Michael R. Stead, Weimin Zhou
  • Patent number: 8532481
    Abstract: Optical networks occasionally experience a fault along a communications path. Service providers prefer to have an alternative communications path available to enable users to still communicate in a seamless manner. Accordingly, a method and corresponding apparatus for providing path protection for dedicated paths in an optical network is provided.
    Type: Grant
    Filed: January 27, 2010
    Date of Patent: September 10, 2013
    Assignee: Tellabs Operations, Inc.
    Inventors: Thomas T. Karjck, Dion Kwun Kit Loung, Jonathan B. Sadler, Digvijay Sharma, Ramesh Kuppusamy, David W. Jenkins
  • Patent number: 8532485
    Abstract: A system and method for a transparent WDM metro ring architecture in which optics enables simultaneous provisioning of dedicated wavelengths for high-end user terminals, while low-end user terminals share wavelengths on “virtual rings”. All wavelengths are sourced by the network and remotely modulated at customer “End Stations” by low cost semiconductor optical amplifiers, which also serve as transmission amplifiers. The transparent WDM metro ring architecture permits the communication of information and comprises a fiber optical feeder ring, at least one fiber optical distribution ring, a network node (NN), at least one access node (AN) said network node and said at least one access node connected via said fiber optical feeder ring and at least one end station (ES) connected via said fiber optical distribution ring to said at least one access node, wherein said user is attached to said at least one end station.
    Type: Grant
    Filed: October 19, 2011
    Date of Patent: September 10, 2013
    Assignee: AT&T Intellectual Property II, L.P.
    Inventors: Nicholas J. Frigo, Patrick P. Iannone, Kenneth C. Reichmann, Aleksandra Smiljanic