Router Patents (Class 398/49)
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Publication number: 20120163813Abstract: An optical network (10) comprises a first optical transmitter (12), a first controller (14), optical receiver apparatus (16) and an optical network element (20) comprising an optical receiver (22), a second optical transmitter (24), and a second controller (26). The first controller controls the first optical transmitter to generate and transmit a first optical signal having a first signal format until the optical receiver apparatus detects the second optical signal and subsequently controls it to apply a second signal format to said first optical signal. The second controller (26) controls the second optical transmitter to iteratively generate and transmit the second optical signal at different wavelength until a first optical having a second signal format is detected. The second controller subsequently maintains generation and transmission of the second optical signal at the wavelength at which the first optical signal was identified as having the second signal format.Type: ApplicationFiled: August 19, 2009Publication date: June 28, 2012Inventors: Renato Grosso, Lorenzo Machionni, Lisa Quadrini
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Publication number: 20120163814Abstract: The present invention provides a method and device for routing and wavelength assignment in an optical network. The method comprises: a topology step in which a topology network of the optical network is obtained; a route calculation step in which at least one route in the topology network is calculated, a first node and a last node of the route being predetermined, and the at least one route being part of all routes from the first node to the last node; and a wavelength assignment determination step in which for each node on the route, it is determined whether link attribute information of the node meets a predetermined constraint condition, if the predetermined constraint condition is met, the route is selected as a working route, and the method ends; if the predetermined constraint condition is not met, the method returns to the route calculation step.Type: ApplicationFiled: May 27, 2010Publication date: June 28, 2012Applicant: ZTE CORPORATIONInventor: Wei Zhao
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Patent number: 8208808Abstract: An apparatus comprising a first node configured to forward a wavelength assignment message to a second node, wherein the wavelength assignment message comprises a wavelength set type-length-value (TLV), a wavelength assignment method selection TLV, a supplemental wavelength assignment information TLV, a traffic parameter TLV, or combinations thereof. Also included is a network component comprising at least one processor configured to implement a method comprising obtaining a wavelength set data, a wavelength assignment method selection data, a supplemental wavelength assignment data, a traffic parameter data, or combinations thereof, and using at least one TLV to represent the obtained data. Also included is a method comprising obtaining a wavelength assignment information comprising a wavelength set, a supplemental wavelength assignment information, a wavelength assignment method selection, a traffic parameter, or combinations thereof, and forwarding the wavelength assignment information along a path.Type: GrantFiled: August 6, 2008Date of Patent: June 26, 2012Assignee: Futurewei Technologies, Inc.Inventors: Greg Bernstein, Young Lee
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Publication number: 20120148243Abstract: A network component comprising at least one processor configured to implement a method comprising obtaining a wavelength availability information for a path, determining whether to implement a wavelength assignment based on the wavelength availability information, updating the wavelength availability information when the wavelength assignment is to be implemented, and forwarding the wavelength availability information. Also included is a method comprising obtaining a wavelength availability information, comparing a number of wavelengths in the wavelength availability information to a threshold, determining whether to implement wavelength conversion along a path when the number of available wavelengths is less than or about equal to the threshold, and resetting the wavelength availability information when wavelength conversion is to be implemented.Type: ApplicationFiled: February 23, 2012Publication date: June 14, 2012Applicant: FUTUREWEI TECHNOLOGIES, INC.Inventors: Greg Bernstein, Young Lee
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Publication number: 20120148241Abstract: A method of operation of an optical network communication system including: providing a planar lightwave circuit including: connecting 2×2 single-mode optical couplers in an array for forming a 1×N single-mode optical splitter/combiner, and routing harvesting ports to an optical line terminal receiver for collecting harvested-light, from two or more of the harvesting ports, in the optical line terminal receiver wherein one of more of the harvesting ports is from the 2×2 single-mode optical couplers; transmitting to an optical network unit through the planar lightwave circuit at a first wavelength; and interpreting a response from the optical network unit at a second wavelength through the harvested-light.Type: ApplicationFiled: December 13, 2010Publication date: June 14, 2012Applicant: NEOPHOTONICS CORPORATIONInventors: David Piehler, Anthony J. Ticknor
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Publication number: 20120148242Abstract: A Wavelength Division Multiplexing (WDM) multi-mode switching system and method and method provides concurrent switching in various switching modes. For example, WDM links may communicate data in various switching modes including, but not limited to, an electronic packet switching (EPS) mode, optical circuit switching (OCS) mode, and optical burst switching (OBS) mode. Edge routers and core routers in the WDM multi-mode switching systems and methods provide switching and processing necessary to handle data provided in the various switching modes. Further, the WDM multi-mode switching systems and methods can also provide dynamic reconfiguration between the various switching modes.Type: ApplicationFiled: December 14, 2011Publication date: June 14, 2012Applicant: University of HoustonInventors: Yuhua Chen, Wenjing Tang
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Patent number: 8200085Abstract: The invention concerns an optical digital transmitting device for cross connecting, routing and switching at temporal, spatial and frequency level a plurality of electromagnetic beams. Said device uses a plurality of laser type or other low/medium power type magnetic sources, coupled to a plurality of matrix optical heads and specific delay lines of the structured waveguide type based, for example, on optical fibers, of natural crystalline or specific synthetic structure, of optical passive/active memory structure, of any combination thereof. The electromagnetic multiple beam cross connection, routing and switching function whether of the optical type or not enables it to be used in various fields in telecommunications (such as point-to-point, point-to-multipoint free-space transmission).Type: GrantFiled: January 30, 2007Date of Patent: June 12, 2012Inventor: Jean-Marc (Joseph) Desaulniers
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Patent number: 8200084Abstract: A network component comprising at least one control plane controller configured to implement a method comprising transmitting a message to at least one adjacent control plane controller, wherein the message comprises a Type-Length-Value (TLV) indicating Routing and Wavelength Assignment (RWA) information. Included is a method comprising communicating a message comprising a TLV to a control plane controller, wherein the TLV indicates RWA information. Also included is an apparatus comprising a control plane controller configured to communicate a TLV to at least one adjacent control plane controller, wherein the TLV indicates RWA information.Type: GrantFiled: July 25, 2008Date of Patent: June 12, 2012Assignee: Futurewei Technologies, Inc.Inventors: Greg Bernstein, Young Lee
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Patent number: 8190025Abstract: A wavelength selective switch utilizing aperture-shared optics and functionally distinct planes of operation that enables high fiber port counts, such as 1×41, and multiplicative expansion, such as to 1×83 or 1×145, by utilizing elements optimized for performance in one of the functionally distinct planes of operation without affecting the other plane.Type: GrantFiled: July 23, 2008Date of Patent: May 29, 2012Assignee: Olympus CorporationInventors: Harry W. Presley, Michael L. Nagy
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Publication number: 20120121262Abstract: A synchronous packet switch comprises output modules, input modules, optical connections and a switch control unit. The output modules comprise optical receivers each configured to receive optical signals at a different wavelength. The input modules receive electric signals carrying data cells to be routed. Each input module comprises optical transmitters, each configurable to generate an optical signal at a different wavelength, and routing apparatus comprising output ports. Each output module has at least one output port allocated to it. The routing apparatus is configurable to route a received optical signal to a selected output port. The optical connections are arranged to couple output ports to respective output modules. The switch control unit controls routing of the optical signals from the transmitters to the output modules and generates a routing control signal for configuring the routing apparatus to route an optical signal from a transmitter to a selected output port.Type: ApplicationFiled: July 22, 2009Publication date: May 17, 2012Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)Inventors: Nicola Andriolli, Antonella Bogoni, Alberto Bianchi, Piero Castoldi, Luca Poti, Pier Giorgio Raponi
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Patent number: 8170415Abstract: An optical power information receiving unit receives optical power information transmitted from a power monitor. When it is judged that a new IT apparatus is connected to an optical switch, an optical switch control unit controls the optical switch to connect the IT apparatus and an optical switch control device. A control device port setting unit changes an IP address of an apparatus information acquiring port based on a control device setting address of an address information storing unit. An apparatus information acquiring unit acquires an IP address of the IT apparatus.Type: GrantFiled: February 10, 2006Date of Patent: May 1, 2012Assignee: Fujitsu LimitedInventors: Toshiki Tanaka, Kouichirou Amemiya, Hideyuki Miyata
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Publication number: 20120099863Abstract: In one aspect, a system includes one or more electrical switches to transfer data in a data network; one or more optical switching groups coupled to each electrical switch, each switching group having one or more server racks, each server rack coupled to a top of rack (TOR) switch and an optical transceiver coupled to the TOR switch; and an optical switching unit (OSU) coupled to the one or more optical switching groups.Type: ApplicationFiled: October 25, 2010Publication date: April 26, 2012Applicant: NEC Laboratories America, Inc.Inventors: Lei Xu, Yueping Zhang, Atul Singh, Guofei Jiang, Ting Wang
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Patent number: 8165468Abstract: In today's reconfigurable optical add/drop multiplexer (ROADM) based optical node, transponders associated with the ROADMs' add/drop ports are dedicated to a given network node interface. Dedicated transponders reduce the flexibility to route around network failures. Example embodiments of the invention includes an optical node and corresponding method for routing optical signals within an optical node. The optical node may include at least two ROADMs to transmit respective wavelength division multiplexed (WDM) signals onto at least two inter-node network paths and at least one add/drop module including add ports to direct add wavelengths received from tributary network paths to each of the ROADMs via intra-node network paths to allow the wavelengths to be available to be added to the inter-node network paths.Type: GrantFiled: January 13, 2009Date of Patent: April 24, 2012Assignee: Tellabs Operations, Inc.Inventors: Mark E. Boduch, Kimon Papakos
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Publication number: 20120087659Abstract: An apparatus includes an array of N laser light sources, an array of N optical detectors, and a wavelength-selective optical router. The wavelength-selective optical router is configured to receive light emitted by the laser light sources and to route the light received from each laser light source to one of the optical detectors corresponding thereto. The apparatus is configured to adjust output wavelengths of the laser light sources based on light intensities measured by the optical detectors.Type: ApplicationFiled: November 12, 2010Publication date: April 12, 2012Inventor: Douglas M. Gill
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Patent number: 8155521Abstract: Provided are a network node which has a wavelength switching cross-connection function and can thus interconnect paths of a wavelength-division-multiplexed optical signal and convert wavelengths, and an operating method of the network node. Accordingly, it is possible to provide a multi-degree cross-connection system having a simple structure at lower cost by allowing transmission of optical signals supposed not to be added/dropped at a network node without converting them into electrical signals and performing O/E conversion or E/O conversion only on optical signals supposed to be added/dropped at a network node. In addition, it is possible to increase the expandability of networks by regenerating degraded signals and which can effectively utilize bandwidths by grooming low-speed electrical digital hierarchy signals and transmitting them as high-speed optical signals.Type: GrantFiled: December 6, 2006Date of Patent: April 10, 2012Assignee: Electronics and Telecommunications Research InstituteInventors: Hwan-Seok Chung, Kwangloon Kim, Sang-Soo Lee, Sun-Hyok Chang
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Publication number: 20120082454Abstract: 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: ApplicationFiled: July 8, 2011Publication date: April 5, 2012Applicant: FUJITSU LIMITEDInventor: Hiroki OOI
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Patent number: 8145056Abstract: A network component comprising at least one processor configured to implement a method comprising obtaining a wavelength availability information for a path, determining whether to implement a wavelength assignment based on the wavelength availability information, updating the wavelength availability information when the wavelength assignment is to be implemented, and forwarding the wavelength availability information. Also included is a method comprising obtaining a wavelength availability information, comparing a number of wavelengths in the wavelength availability information to a threshold, determining whether to implement wavelength conversion along a path when the number of available wavelengths is less than or about equal to the threshold, and resetting the wavelength availability information when wavelength conversion is to be implemented.Type: GrantFiled: July 15, 2008Date of Patent: March 27, 2012Assignee: Futurewei Technologies, Inc.Inventors: Greg Bernstein, Young Lee
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Publication number: 20120070148Abstract: A method implemented in an optical flexible wavelength division multiplexing FWDM network includes finding a first channel out of available channels with sufficient spectrum on a given route out of available channels in an optical FWDM network; finding a second channel at a lower wavelength out of the available channels for minimizing total spectrum on the given route; selecting a channel out of the available channels on K-distinct shortest routes; and finding line rates of channels using a predetermined channel selection.Type: ApplicationFiled: September 19, 2011Publication date: March 22, 2012Applicant: NEC Laboratories America, Inc.Inventors: Ankitkumar Patel, Philip Nan Ji
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Patent number: 8139938Abstract: A hierarchical route inquiry method in Automatic Switched Optical Network is applied to the networks having multi-layer route domains. According to the method, after the route controller RC in one child domain receives the Route Request, if it can not calculate the complete route, it sends the Route Request to the RC in the parent domain; if the RC in the parent domain can not obtain the complete route, it further interacts with other child domains to obtain the complete route and returns the Route Response back to the requester. The present invention solves the problem of creating a cross-domain connection in route inquiry in the Automatic Switched Optical Network.Type: GrantFiled: December 1, 2006Date of Patent: March 20, 2012Assignee: ZTE CorporationInventor: Desheng Sun
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Publication number: 20120057869Abstract: An M×N wavelength-selective switch (WSS) is provided. M input ports launch M input beams towards a wavelength-dispersing system, which disperses the M input beams into M×K sub-beams at K wavelength bands. A redirecting system redirects the M×K sub-beams towards a first 1×K switching array, which selects K sub-beams from the M×K sub-beams. The redirecting system blocks the (M?1)×K non-selected sub-beams, but re-images the K selected sub-beams onto a second 1×K switching array by means of at least one relaying element having optical power. The second 1×K switching array routes the K selected sub-beams to N output ports. The redirecting system redirects the K selected sub-beams towards the wavelength-dispersing system, which combines any selected sub-beams that are routed to a same output port. The N output ports then output the K selected sub-beams.Type: ApplicationFiled: November 15, 2011Publication date: March 8, 2012Inventor: Paul Colbourne
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Publication number: 20120057868Abstract: The present invention discloses a method and a system for implementing alternative routes in optical transmission network of WSON. By using the method and the system the following alternative routes implementing process is realized: computing the alternative routes of each subsegment independently based on a constraining condition distributed by a managing plane, and combining the computed alternative routes of each subsegment to form complete alternative routes. The present method and system for implementing alternative routes is capable of obtaining more alternative routes than those of prior art, and takes full advantage of network resource topology.Type: ApplicationFiled: September 2, 2009Publication date: March 8, 2012Applicant: ZTE CORPORATIONInventors: Zhenyu Wang, Dajiang Wang
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Patent number: 8131303Abstract: Embodiments provide a wireless network with several access points connected to a communication infrastructure. Residential or business customers of the Internet are provided an Internet interface (e.g., a digital subscriber line (DSL) modem) having a wireless transceiver. Two or more users may access the Internet or other network through the Internet interface. Each user can be assigned a unique Service Set-Identifier (SSID) with each SSID associated with a type of service (e.g., user video service, backhaul service, etc.). The amount of bandwidth assigned to the type of service (and user) may be governed by the equipment according to the assigned SSID.Type: GrantFiled: January 22, 2009Date of Patent: March 6, 2012Assignee: Qwest Communications International Inc.Inventors: Charles I. Cook, Thomas Schwengler
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Patent number: 8131149Abstract: The invention pertains to methods, apparatus, and systems optical of networking using tunable receivers, optical blocking elements selectively placed in the network, and optical routing elements comprised of passive elements, such as optical couplers and splitters. The routing elements have a plurality of ports and comprise passive elements such as couplers and splitters configured so that input light received at any port of the element is output from each of the other ports of the element, but not at port at which it was input.Type: GrantFiled: May 6, 2009Date of Patent: March 6, 2012Assignee: Ciena CorporationInventor: Harald Zottmann
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Publication number: 20120045206Abstract: A multi-chassis network device includes a plurality of nodes that operate as a single device within the network and a switch fabric that forwards data plane packets between the plurality of nodes. The switch fabric includes a set of multiplexed optical interconnects coupling the nodes. For example, a multi-chassis router includes a plurality of routing nodes that operate as a single router within a network and a switch fabric that forwards packets between the plurality of routing nodes. The switch fabric includes at least one multiplexed optical interconnect coupling the routing nodes. The nodes of the multi-chassis router may direct portions of the optical signal over the multiplexed optical interconnect to different each other using wave-division multiplexing.Type: ApplicationFiled: October 28, 2011Publication date: February 23, 2012Applicant: JUNIPER NETWORKS, INC.Inventor: Pradeep Sindhu
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Patent number: 8121477Abstract: The present invention is directed to an optical node apparatus in which the number of light elements that propagates reference light is reduced, which includes pa input-side wavelength mux/demux elements, a switch module, pb output-side wavelength mux/demux elements, and a reference light source. Each of the input-side wavelength mux/demux element include at least two first port and at least two second port. One of the first ports included in each input-side wavelength mux/demux element is coupled to an input transmission path. The other of the first ports coupled to the reference light source, and each of the second ports is coupled to an input end of the switch module.Type: GrantFiled: July 16, 2009Date of Patent: February 21, 2012Assignee: Fujitsu LimitedInventor: Yutaka Takita
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Patent number: 8116630Abstract: A system and method for dynamically adding/dropping wavelengths in a reconfigurable optical add-drop multiplexer (ROADM) transport network is disclosed.Type: GrantFiled: December 8, 2008Date of Patent: February 14, 2012Assignee: AT&T Intellectual Property I, L.P.Inventor: Philip Wisseman
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Publication number: 20120033970Abstract: A network component comprising at least one processor configured to implement a method comprising transmitting a request to compute a routing assignment, a wavelength assignment, or both, wherein the request comprises a lightpath constraint indicator is disclosed. Also disclosed is an apparatus comprising a Path Computation Client (PCC) configured to transmit a request to and receive a reply from a Path Computation Element (PCE), wherein the request comprises a lightpath constraint, and wherein the reply comprises a routing assignment, a wavelength assignment, an error message, a no-path indication, or combinations thereof. Included is a method comprising receiving a request comprising a request parameter (RP) object comprising a lightpath constraint, sending a reply comprising a routing assignment, a wavelength assignment, an error message, a no-path indicator, or combinations thereof, wherein the request is received and the reply is sent using path computation element protocol (PCEP).Type: ApplicationFiled: October 13, 2011Publication date: February 9, 2012Applicant: FUTUREWEI TECHNOLOGIES, INC.Inventors: Young Lee, Greg Bernstein
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Publication number: 20120008945Abstract: Systems and methods are disclosed to communicate over an optical network by using hop-by-hop routing over an optical network; and dynamically constructing a network topology.Type: ApplicationFiled: April 3, 2011Publication date: January 12, 2012Applicant: NEC Laboratories America, Inc.Inventors: Ankit Singla, Atul Singh, Kishore Ramachandran, Lei Xu, Yueping Zhang
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Publication number: 20120008946Abstract: A method (10) of configuring a synchronous optical switch to route received data cells. The synchronous optical switch comprises optical switch transmitter modules, each comprising tunable optical transmitters, optical switch receiver modules, each comprising optical receivers, and optical connections between the transmitter modules and receiver modules. For each optical switch transmitter module, the method: assigns (12) wavelengths associated with the received data cells to the transmitters such that each wavelength is assigned to a different transmitter; and generates (14) a control signal for controlling the operating wavelength of each) transmitter.Type: ApplicationFiled: December 22, 2008Publication date: January 12, 2012Applicant: Telefonaktiebolaget LInventors: Nicola Andriolli, Alberto Bianchi, Piero Castoldi, Pier Giorgio Raponi
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Patent number: 8086101Abstract: A multi-city wavelength link architecture is used to distribute spectral bands received on input optical signals among output optical signals. Such an architecture may include an optical wavelength cross connect having multiple input ports, multiple output ports, and a wavelength routing element that selectively routes wavelength components between one optical signal and multiple optical signal. Such an optical wavelength cross connect will generally receive cross-connect-input optical signals at the input ports and transmit cross-connect-output optical signals from the output ports. Methods are used to increase the number of cities that may be accommodated by the architecture without disrupting through traffic between the existing cities.Type: GrantFiled: April 19, 2002Date of Patent: December 27, 2011Assignee: Altera CorporationInventors: S. Christopher Alaimo, Dirk Barthel, George David Morley, Edward J. Bortolini, Richard W. Urie
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Publication number: 20110299850Abstract: Switching architectures for WDM mesh and ring network nodes are presented. In mesh networks, the switching architectures have multiple levels—a network level having wavelength routers for add, drop and pass-through functions, an intermediate level having device units which handle add and drop signals, and a local level having port units for receiving signals dropped from the network and transmitting signals to be added to the network. The intermediate level device units are selected and arranged for performance and cost considerations. The multilevel architecture also permits the design of reconfigurable optical add/drop multiplexers for ring network nodes, the easy expansion of ring networks into mesh networks, and the accommodation of protection mechanisms in ring networks.Type: ApplicationFiled: August 12, 2011Publication date: December 8, 2011Applicant: CISCO TECHNOLOGY, INC.Inventors: Ornan Gerstel, Mauro Macchi, Stefano Piciaccia
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Patent number: 8073332Abstract: A photonic cross-connect includes a plurality of ingress WS-switches with drop outputs outputting WDM drop signals including odd channels and a plurality of egress WS-switches for receiving WDM add signals including add channels. Wavelength selective elements in a drop path and in an add path comply with a double frequency spacing and about a double bandwidth of the ingress WS-switches or egress WS-switches. If both odd and even channels are dropped and added, separate add and drop paths are provided for the odd and for the even channels.Type: GrantFiled: November 21, 2008Date of Patent: December 6, 2011Assignee: Nokia Siemens Networks OyInventor: Robert Schimpe
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Publication number: 20110280574Abstract: Systems and methods for providing broadband communication are provided. A source component may be configured to provide a downstream broadband signal to one or more customer devices and receive upstream signals from the customer devices, including a first upstream signal having a frequency lower than the downstream broadband signal and a second upstream signal having a frequency higher than the downstream broadband signal. An optical fiber node in communication with the source component may be configured to receive and convert downstream and upstream broadband signals from radio frequency signals to light signals and vice versa. A terminator in communication with the optical fiber node via one or more cable lines may be configured to output the radio frequency downstream signal for receipt by the customer devices and to direct the communication of the upstream signals to the optical fiber node via the one or more cable lines.Type: ApplicationFiled: May 17, 2011Publication date: November 17, 2011Applicant: COX COMMUNICATIONS, INC.Inventor: Jeffrey L. Finkelstein
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Patent number: 8059960Abstract: A network component comprising at least one processor configured to implement a method comprising transmitting a request to compute a routing assignment, a wavelength assignment, or both, wherein the request comprises a lightpath constraint indicator is disclosed. Also disclosed is an apparatus comprising a Path Computation Client (PCC) configured to transmit a request to and receive a reply from a Path Computation Element (PCE), wherein the request comprises a lightpath constraint, and wherein the reply comprises a routing assignment, a wavelength assignment, an error message, a no-path indication, or combinations thereof. Included is a method comprising receiving a request comprising a request parameter (RP) object comprising a lightpath constraint, sending a reply comprising a routing assignment, a wavelength assignment, an error message, a no-path indicator, or combinations thereof, wherein the request is received and the reply is sent using path computation element protocol (PCEP).Type: GrantFiled: July 16, 2008Date of Patent: November 15, 2011Assignee: Futurewei Technologies, Inc.Inventors: Young Lee, Greg Bernstein
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Patent number: 8050257Abstract: A high capacity network comprises a plurality of edge nodes with asymmetrical connections to a plurality of switch planes, each switch plane comprising fully meshed fast-switching optical switch units. Upstream wavelength channels from each source edge node connect to different switch planes in a manner which ensures that upstream wavelength channels from any two edge nodes connect to a common switch unit in at most a predefined number, preferably one, of switch planes. Thus, switch units in different switch planes connect to upstream channels from orthogonal subsets of source edge nodes. In contrast, downstream wavelength channels from a switch unit in each switch plane connect to one set of sink edge nodes. In an alternate arrangement, the upstream and downstream asymmetry may be reversed.Type: GrantFiled: December 6, 2007Date of Patent: November 1, 2011Inventor: Maged E Beshai
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Patent number: 8050559Abstract: A multi-chassis network device includes a plurality of nodes that operate as a single device within the network and a switch fabric that forwards data plane packets between the plurality of nodes. The switch fabric includes a set of multiplexed optical interconnects coupling the nodes. For example, a multi-chassis router includes a plurality of routing nodes that operate as a single router within a network and a switch fabric that forwards packets between the plurality of routing nodes. The switch fabric includes at least one multiplexed optical interconnect coupling the routing nodes. The nodes of the multi-chassis router may direct portions of the optical signal over the multiplexed optical interconnect to different each other using wave-division multiplexing.Type: GrantFiled: August 1, 2007Date of Patent: November 1, 2011Assignee: Juniper Networks, Inc.Inventor: Pradeep Sindhu
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Patent number: 8045854Abstract: A M×N wavelength selective optical switch (WSS) for switching K wavelength channels is disclosed. The WSS has two MEMS micromirror arrays, a M×K array and a 1×N array, for switching any wavelength channel from any input port to any output port, provided that any output port receives optical signals from only one input port. The WSS can be used to build fully reconfigurable, colorless and directionless node of an agile optical network.Type: GrantFiled: February 6, 2009Date of Patent: October 25, 2011Assignee: JDS Uniphase CorporationInventor: Paul Colbourne
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Patent number: 8023825Abstract: Switching architectures for WDM mesh and ring network nodes are presented. In mesh networks, the switching architectures have multiple levels—a network level having wavelength routers for add, drop and pass-through functions, an intermediate level having device units which handle add and drop signals, and a local level having port units for receiving signals dropped from the network and transmitting signals to be added to the network. The intermediate level device units are selected and arranged for performance and cost considerations. The multilevel architecture also permits the design of reconfigurable optical add/drop multiplexers for ring network nodes, the easy expansion of ring networks into mesh networks, and the accommodation of protection mechanisms in ring networks.Type: GrantFiled: April 4, 2006Date of Patent: September 20, 2011Assignee: Cisco Technology, Inc.Inventors: Ornan Gerstel, Mauro Macchi, Stefano Piciaccia
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Publication number: 20110217039Abstract: An optical transmission network comprises a multi-wavelength source (7) shared between multiple sets of client side equipment for manipulating electrical signals. A first wavelength selective routing element (5) is connected to the multi-wavelength source (7). Each set of client-side equipment (1) comprises an optical modulator (3) connected to the first wavelength selective routing element (5) and an optical receiver (2). A second wavelength selective routing element (6) is connected to the optical receiver (2) and is operative to direct incoming signals from one or more remote locations to the optical receiver (2). The network provides a WDM architecture solution for networks whereby the cost of implementing and running client side equipment (1) is reduced by not having the WDM source (7) within the client side equipment (1).Type: ApplicationFiled: October 26, 2009Publication date: September 8, 2011Inventor: David William Smith
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Patent number: 7995891Abstract: An arrangement includes a photonic band-gap assembly comprising at least one input wave guide and at least one output wave guides, and at least one routing element responsive to signals to selectively route a signal from the input wave guide to one or more of the output wave guides.Type: GrantFiled: October 30, 2009Date of Patent: August 9, 2011Inventors: Muriel Y. Ishikawa, Edward K. Y. Jung, Clarence T. Tegreene
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Patent number: 7983514Abstract: An arrangement includes a photonic band-gap assembly comprising at least one input wave guide and at least one output wave guides, and at least one routing element responsive to signals to selectively route a signal from the input wave guide to one or more of the output wave guides.Type: GrantFiled: April 12, 2010Date of Patent: July 19, 2011Inventors: Muriel Y. Ishikawa, Edward K. Y. Jung, Clarence T. Tegreene
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Publication number: 20110170867Abstract: The present invention relates to a wavelength switch including two switching stages. A single actuation array of reflecting elements of a first switching stage routes sub-beams at different wavelength bands to a plurality of actuation arrays of reflecting elements of a second switching stage. Each second-stage actuation array routes sub-beams to a group of output ports associated with that second-stage actuation array. Advantageously, the sub-beams are redirected from the first switching stage to the second switching stage by a reflecting relay assembly, without being combined or coupled into fibers.Type: ApplicationFiled: February 8, 2008Publication date: July 14, 2011Inventors: Barrie Keyworth, Paul Colbourne
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Publication number: 20110135305Abstract: The present invention includes novel techniques, apparatus, and systems for optical WDM communications. Tunable lasers are employed to generate subcarrier frequencies representing subchannels of an ITU channel to which client signals can be mapped. Client circuits can be divided and combined before being mapped, independent of one another, to individual subchannels within and across ITU channels. Subchannels may be independently routed to a single subchannel receiver filter, such that each subchannel detected at the receiver may come from a different source location. Network architectures and subchannel transponders, muxponders and crossponders are disclosed, and techniques are employed (at the subchannel level/layer), to facilitate the desired optical routing, switching, concatenation and protection of client circuits mapped to these subchannels across the nodes of a WDM network. Subchannel hopping may also be used to increase the optical network security.Type: ApplicationFiled: December 6, 2010Publication date: June 9, 2011Applicant: VELLO SYSTEMS, INC.Inventor: Chris Wilhelm Barnard
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Publication number: 20110129220Abstract: An optical routing network provides function-specific routing, in the optical domain, of radio frequency (RF) signals between inputs to the network and function-specific outputs from the network. RF signals input to the network may comprise signals received by elements of a multi-function array antenna for routing to function-specific receiving equipment or signals from function-specific transmitting equipment for routing to selected elements of the antenna for transmission. The optical routing path through the optical routing network is chosen by selecting one or more predetermined optical carrier wavelengths in the optical routing network, each carrier wavelength being associated with a particular function of the antenna.Type: ApplicationFiled: July 17, 2009Publication date: June 2, 2011Applicant: BAE SYSTEMS plcInventors: Mohammed Nawaz, Richard Peter Joyce, Nicholas John Easton
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Patent number: 7933519Abstract: An optimally-sized optical cross-connect that switches optical signal paths with a minimum number of wavelength selective switches and their interconnections. To switch optical signals of N routes (N=1, 2, . . . ), an optical cross-connect includes a 2×N (2-input, N-output) wavelength selective switch for each of N input routes and a N×2 (N-input, 2-output) wavelength selective switch for each of N output routes. One input port of each 2×N wavelength selective switch receives an optical signal from a corresponding input route, while the other input port of the same receives an optical add signal from a corresponding add route. One output port of each N×2 wavelength selective switch outputs an optical signal to a corresponding output route, while the other output port outputs an optical drop signal to a corresponding drop route.Type: GrantFiled: November 19, 2007Date of Patent: April 26, 2011Assignee: Fujitsu LimitedInventors: Yuichi Akiyama, Takafumi Terahara, Hiroki Ooi
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Patent number: 7925165Abstract: A packet and optical routing equipment exchanges multiplexed optical signals with other equipment in a network and exchanges branch non-packet and packet signals with client equipment. The entering branch non-packet signals are converted into electric signals by a non-packet interface and supplied directly to an electric switching unit, the entering packet branch signals are converted into electric signals, supplied to a packet forwarding module and routed to the electric switching unit. The electric switching unit switches the electric signals toward a WDM interface that converts them into optical signals at selected wavelengths that are added to the multiplexed optical signals. The entering multiplexed optical signals that should be terminated in the equipment are extracted, converted into electrical signals, and electrically switched toward the non-packet interface or the packet forwarding module according to whether they are of non-packet or of a packet type.Type: GrantFiled: August 7, 2003Date of Patent: April 12, 2011Assignees: Telecom Italia S.p.A., Pirelli & C. S.p.A.Inventors: Carlo Cavazzoni, Alessandro D'Alessandro
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Patent number: 7899326Abstract: A system for communicating cross-connection information within an optical network by use of wavelength information is provided. Cross-connection information in Wavelength Division Multiplexing (WDM) devices is abstracted, to produce wavelength reachability information and wavelength occupation status information for each node within the optical network. Cross-connection information is distributed from one node to all other nodes or a Path Calculation Equipment (PCE), through extended routing protocols, providing a base for calculating service paths.Type: GrantFiled: January 11, 2007Date of Patent: March 1, 2011Assignee: Huawei Technologies Co., Ltd.Inventors: Xinghua Shi, Baoquan Rao, Yu Wang, Chunhui Chen
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Publication number: 20110033183Abstract: Systems and methods are described that that dynamically configure high-speed data link lightpaths between access routers and backbone routers at geographically dispersed locations to reassign traffic when a backbone router fails or is removed from service. Embodiments reduce the quantity of backbone router ports used in dual backbone router-homed networks.Type: ApplicationFiled: August 6, 2009Publication date: February 10, 2011Inventors: Robert Duncan Doverspike, Rakesh Kumar Sinha, Peter D. Magill, Jennifer Yates
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Information processing system, calculation node, and control method of information processing system
Patent number: 7853147Abstract: The present invention provides an information processing system, comprising a plurality of calculation nodes with an optical transmitter, which individually outputs a plurality of optical signals each having a different wavelength, and an optical receiver, which individually receives a plurality of optical signals each having a different wavelength, an optical transmission path connecting a plurality of the calculation nodes to each other, and optical pathway switching unit, lying in the optical transmission path, for transmitting the optical signal to the specific calculation node in accordance with a wavelength of the optical signal output from one of the calculation nodes.Type: GrantFiled: June 7, 2005Date of Patent: December 14, 2010Assignee: Fujitsu LimitedInventors: Toshiki Tanaka, Yasuhiko Aoki, Hideyuki Miyata, Takao Naito, Kouichiro Amemiya -
Patent number: 7848649Abstract: A wavelength-division-multiplexed based photonic burst switched (PBS) network, which includes edge and switching nodes, optically communicate information formatted into PBS control and data burst frames. Each PBS data burst frame is associated with a PBS control burst frame. A PBS burst frame includes a PBS burst header and burst payload having fields to indicate whether: (a) the PBS burst frame is a PBS control burst; (b) the control burst is transmitted on a wavelength different from that of the associated PBS data burst; and (c) the PBS burst frame has a label for use in a generalized multi-protocol label swapping (GMPLS)-based control system. The PBS burst payload frame includes fields to indicate (a) specific PBS payload information; (b) PBS data payload; and (c) an optional PBS payload frame check sequence (FCS) for error detection.Type: GrantFiled: February 28, 2003Date of Patent: December 7, 2010Assignee: Intel CorporationInventors: Christian Maciocco, Shlomo Ovadia