56 results about "Optical mesh network" patented technology

A wavelength division multiplexed optical network has a restoration process to re-route one or more of the wavelengths, by dynamically determining possible restoration routes, and re-routing each wavelength along a chosen one of the possible restoration routes. A distributed dynamic search for restoration routes down to the optical layer, for wavelengths, gives faster and more scalable restoration than reconfiguring routing tables and enables much better utilisation of bandwidth than using predetermined restoration paths.

A system and method for establishing protection routes in optical mesh networks. A protection protocol is provided that utilizes a destination-to-source communication channel to establish a source-to-destination protection route. The communication channel is established from the node detecting the failed link back towards the transmitting node. As the destination-to-source communication channel is being established back towards the source node, it concurrently directs the nodes along this path to perform switching functions to subsequently allow the information originally intended for transmission via the failed link to be switched to the alternate protection path. Various manners of ascertaining the protection routes are also provided, including predetermined and / or dynamically-generated protection paths established via the destination-to-source communication channel.

The mesh network remote control device is able to dynamically exchange information with other mesh network devices via a mesh network, partial mesh network, ad-hoc network or with an non-mesh network such as the Internet or an intranet. The mesh network remote control device controls devices connected to such mesh or non-mesh networks. The mesh network remote control device accepts commands from mesh network devices, non-mesh network devices, non-mesh communications networks (e.g., URLs, device commands, social networking logins, etc.), stores the original commands and transforms the original commands into simple display commands that are used by a user to control remote mesh network or non-mesh network devices.

The present invention relates to protection and restoration method for MPXS in optical mesh networks, particularly to protection and restoration method which can find and restore fast failures by configuring routing table with working label and protection label when failures occur at links or nodes. According to the present invention, by configuring a routing table consisted of working label and protection label and by setting an optical path as working path and protection path, data is transferred through the working path, and when a failure occurs in a optical path, data is transferred through a protection path by using a preliminarily configured protection label and by switching to. According to the present invention, by configuring routing table with working label and protection label, failures can be restored fast when failures occur at links or nodes, and whole network resources can be applicable.

The disclosure provides a practical system and methods for implementing an adaptive free-space optical network with a high-connectivity, dynamic mesh topology. The network can have operational characteristics similar to those of RF mobile ad-hock networks. Each node has one or more optical terminals that may utilize space-time division multiplexing, which entails rapid spatial hopping of optical beams to provide a high dynamic node degree without incurring high cost or high size, weight, and power requirements. As a consequence the network rapidly sequences through a series of topologies, during each of which connected nodes communicate. Each optical terminal may include a plurality of dedicated acquisition and tracking apertures which can be used to increase the speed at which traffic links can be switched between nodes and change the network topology. An RF overlay network may be provided to act as a control plane and be used to provide node discovery and adaptive route planning for the optical network.

The mesh network remote control device is able to dynamically exchange information with other mesh network devices via a mesh network, partial mesh network, ad-hoc network or with an non-mesh network such as the Internet or an intranet. The mesh network remote control device controls devices connected to such mesh or non-mesh networks. The mesh network remote control device accepts commands from mesh network devices, non-mesh network devices, non-mesh communications networks (e.g., URLs, device commands, social networking logins, etc.), stores the original commands and transforms the original commands into simple display commands that are used by a user to control remote mesh network or non-mesh network devices.

Methods and systems for mobility of mobile nodes in mesh networks are taught wherein the mobile mesh nodes choose an attachment point to another mesh node based on predetermined criteria, such as the characteristics of the attachment point's path to a reference destination, and other factors local to the attachment point, such as load and available capacity. The mobile nodes forward packets on each other's behalf. Static and mobile nodes and the links between them are treated differently from each other in view of their respectively different properties. A special metric is used for paths that include mobile links in addition to the static mesh links and wired mesh links. Mobility is handled completely transparently to any client devices attached to the mesh nodes, where this attachment could be wireless or wired.

The invention provides a method for achieving network function visualization and a corresponding optical network system based on NFV character node architecture to solve the problem that it is difficult to handle data when the data are mapped to the optical network. The system comprises a resource layer, a physical network control layer, a virtual network control layer and a cloud layer. The network function visualizing method comprises the steps that the cloud layer proposes a virtual network establishing request for the virtual network control layer, the virtual network control layer selects the geographic position of a virtual network node and a source node of an optical channel, the physical network control layer carries out routing selecting and wavelength allocating according to the current node link resource situation to establish virtual network nodes, and the virtual network control layer establishes connection with all the virtual network nodes through the OpenFlow protocol. The novel optical network architecture is adopted, and therefore the data of the optical network in a traditional OTN device can be processed, and the network visualization function can be achieved very well.

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.

The invention relates to a fault section positioning method and system of an optical access network. The method comprises the following steps: acquiring a network element alarm; if acquiring an ONU (optical network unit) power-down alarm, acquiring equipment resource of the alarming ONU, detecting whether the alarming ONU is a MDU (multiple dwelling unit) according to the equipment resource, if the alarming ONU is the MDU, determining that the MDU is the power-down fault; if acquiring any one or more of a PON (passive optical network) port R-LOS alarm, an ONU offline alarm, an ONU optical access bad signal quality alarm and an ONU webmaster off-net alarm, acquiring valid ONU, and judging whether the acquired alarm is the power-down fault and determining the primary fault section according to the state of the valid ONU, and determining the final fault section according to the judgment result of the power-down fault and the primary fault section. Through the adoption of the method and system provided by the invention, the fault of a passive facility of the optical access network can be precisely monitored, the end-to-end accurate positioning of the fault of the optical access network is really realized, and the coverage range of each of the pre-checking and pre-maintenance is effectively enlarged.

A method and apparatus for dispersion management in hybrid data rate long haul mesh networks are provided. The apparatus comprises a dispersion compensator for fully compensating the residual dispersion of a fiber link in the mesh network. A de-interleaver is coupled to the dispersion compensator for de-interleaving odd and even channels of wavelength division multiplexed (WDM) signals transmitted across the fiber link. A delay device is coupled to the de-interleaver for introducing a delay to the odd channels or the even channels of the WDM signals to decorrelate the odd and even channels and substantially reduce inter-channel cross-phase modulation.

Abstract of the DisclosureA Data Distribution Service (DDS) transfers information between nodes in an ad hoc mobile mesh network. The DDS includes many different novel features including techniques for coalescing retransmit requests to minimize traffic, providing a reasonable level of reliability for event oriented communications, multicasting retransmissions for use by many nodes, and providing other optimizations for multicast traffic. The DDS uses UDP datagrams for communications. Communications operate in a truly peer-to-peer fashion without requiring central authority or storage, and can be purely ad hoc and not depend on any central server. The protocol is NACK-based, which is more suited to a mesh network than a traditional approach like TCP, which uses positive acknowledgements of all data. The DDS is amenable to very long recovery intervals, matching well with nodes on wireless networks that lose coverage for significant periods of time and also works well with constantly changing network topologies. Reliability can also be handled over a span of time that might correspond to losing wireless coverage.

The invention discloses a low-congestion communication method and a router for realizing the shared path transmission of an optical network on chip. By the method and the router, the problem of serious network congestion caused by single wavelength communication in the Mesh structure of the conventional optical network on chip is mainly solved. The router provided by the invention comprises optical waveguides, broadband micro-ring resonators and narrowband micro-ring resonator groups, and is used for constructing an optical transmission network of a network on chip. In the communication method, the shared path transmission of a plurality of pairs of communication nodes is realized by utilizing a wavelength division multiplexing technology; judgment in path sharing and the allocation of wavelengths are executed by utilizing a conventional electric control network; when a link establishment packet is congested by the locking of an output port, the judgment in the path sharing may be executed, available wavelengths are allocated for the link establishment packet capable of sharing a path, and then the link establishment packet is continuously forwarded and a plurality of data packets perform the shared optical path transmission by using different communication wavelengths. By the method and the router, the multi-wavelength communication of the Mesh structure of the network on chip can be effectively supported, network congestion can be reduced, network overhead can be decreased and network performance can be improved.

The present invention provides a method and system for the restoration of an optical mesh network subsequent to the simultaneous failing of a large number of network connections due to a transmission failure. The system and method increase the restoration speed of a large number of failed network connections through connection aggregation. The system and method provide that connection aggregation is the logical bundling of a plurality of network connections across a network span. By enabling the bundling of these individual network connections transported over a particular span or spans, a network operator manages the bundle as if it were one network connection. The method and system provide that other network links support these bundled connections when the network segment that a managed bundle is traversing fails.

An optical routing scheme in which an optical network having a mesh topology is configured to route optical packets through an optical routing layout superimposable with the mesh topology, but having a star-like topology. Using this routing layout, the optical network can be configured to transport optical packets from respective ingress nodes, through the hub node located at the star center, to respective egress nodes in a manner that enables a data throughput that approaches the theoretical capacity. No special hardware is required for implementing the hub functionality, and any node of the optical network can be configured to serve as the hub node. The latter feature enables relatively straightforward optimization of the optical routing layout and transmission schedule, e.g., by changing the identity of the hub node and adjusting the transmission schedule at the ingress nodes to synchronize packet arrivals to the hub node.

An information processing method is disclosed according to the embodiments of the present invention. The method includes: A node receives a first message from overhead of a first dimension; the node searches for local configuration information, where the local configuration information includes the overhead of the first dimension of a protection path, a protection resource of the first dimension of the protection path, overhead of a second dimension of the protection path, and a protection resource of the second dimension of the protection path; according to the local configuration information and the first message, the node determines a protection path correlated with the first message and determines overhead of the second dimension correlated with the first message; and the node sends a second message to a node adjacent to the second dimension through the overhead of the second dimension correlated with the first message, according to the first message.

A system and method for discovering configuration errors in an optical network is disclosed. The neighbors of each node are discovered. An information model of the optical network is formed, which may be used to determine configuration errors. In one embodiment, each node exchanges node identification messages with neighboring nodes to discover its neighbors, publishes the node neighbor information to the optical network, and forms its own information model from the node neighbor information published by the nodes.

The invention relates to optical communication technology and provides a method of solving optimum layer rate distribution and optimum wavelength resource distribution in a request protective light multicast switched network. The problem that a traditional multicast max-flow minimum value confirmed layer rate causes heterogeneous network node fairness and low handling capacity is solved. According to the method, a link separation route cluster is found, share degree of the link separation route cluster is calculated, a route inflow node with high share degree adopts network coding information, and information of code compression is transmitted in the route cluster with high share degree, wavelength resources are preferentially distributed to a link with the high share degree, minimum demand distribution of the wavelength resources is achieved, and use ratio of optical network limited wavelength resources is improved. The method of solving optimum layer rate distribution and optimum wavelength resource distribution in the request protective light multicast switched network is in favor of achieving maximum throughput of network, improves wavelength resource use ratio of a light group multicast network, and reduces wavelength number required by a light group.

The invention discloses an optical network end-to-end path establishment method and system based on an energy efficiency diagram. The method includes the steps that a service request in a packet-based network borne by an optical network is received and recognized; according to the request, synergetic topological information of the optical network and the packet-based network is acquired; weight values of multiple paths are calculated according to weight values of multiple network links in the topological information; if the service request comprises an energy efficiency verification request, energy efficiency values of the paths are calculated according to energy consumption of the network links in the topological information, and the path with the minimal energy efficiency value is selected as the finally-selected path. According to the method, the defects that the optical network and the packet-based network independently operate and energy consumption models are independently established in the prior art are overcome, and in order to solve the problem that the energy efficiency of services in the packet-based network borne by the optical network is low, the end-to-end path based on the energy efficiency diagram is established, network performance is guaranteed, and the energy efficiency of the services in the packet-based network borne by the optical network is improved.

The invention discloses a method for acquiring the association between PON ports, an optical network device and an optical network system, belonging to the field of communication. An OLT where a protection PON port is located receives a protection message transmitted by an optical network unit, analyzes the protection message, obtains an identifier, carried in the message, of a working PON port, and acquires the association between the working PON port and the protection PON port according to the received identifier of the protection PON port of the protection message. By implementing the method for acquiring the association between PON ports, the optical network device and the optical network system, the OLT where the protection PON port is located can acquire the association between the working PON port and the protection PON port, confirm that whether the protection message is legitimate or not according to the association or acquire the configuration information of the working PON port according to the association. Defects of a backup optical link when optical fibers are wrongly connected can be avoided.

A system to provide carrier frequency control in an optical network includes a first network element monitoring performance information and a second network element coupled to the first network element by the optical network. The second network element receives performance information from the first network element using an administration channel bandwidth, and modifies a carrier frequency associated with the second network element based on the performance information such that the carrier frequency is aligned to a center of a signal channel bandwidth. A method of providing carrier frequency control includes transmitting performance information by the first network element to the second network element using an administration channel bandwidth, and modifying the carrier frequency by the second network element based on the performance information such that the carrier frequency is aligned to the center of the signal channel bandwidth. The administrative channel bandwidth can be within or outside the signal channel bandwidth. A corresponding computer-readable device is disclosed.

A data center network comprising with an all-optical core network which includes a number of separate all-optical networks to connect clusters of computer network equipment at network nodes. Circuit modules in the data center network each includes a memory bank to provide queues to store information scheduled to be transmitted optically through the all-optical core network. Each circuit module also includes a lambda port module which includes a number of optical mux-demux units and an equal number of lambda ports designed to provide communication between the mux-demux units and the memory bank via a number of optical transceivers. In preferred embodiments all logic communication circuits through the core network are all optical fibers. The present invention creates non-interfering circuits by means of their spectral, spatial and temporal separation from each other.

The embodiment of the invention provides an optical network logical topology reconstruction method. The optical network comprises a first network, a second network, a third network and a reconstruction controller, wherein the first network comprises a plurality of first sub-networks, the second network is an optical interconnection network based on optical wavelength exchange and comprises a plurality of sub-networks, the third network is an optical interconnection network based on space exchange, and the reconstruction controller determines a target logical optical path connection relation of the third network according to a target logical topology structure of the optical network and target resource configuration of the optical network, and sending the optical path configuration information of the third network to an optical path control device of the third network; the reconstruction controller determines a target logic optical path connection relation of the second network according to the target logical topology structure of the optical network and the target resource configuration of the optical network, determines wavelength configuration information of each first sub-network in the first network, and sends the information to the corresponding first sub-network.

A network design that reduces the number of wavelengths needed to support communications in a Wavelength Division Multiplexing (WDM) network is disclosed. Wavelengths are reused in isolated sub-networks that do not share common network paths, allowing for the reduction in cost of the WDM equipment supporting the communications in the network.

A method and apparatus for dispersion management in hybrid data rate long haul mesh networks are provided. The apparatus comprises a dispersion compensator for fully compensating the residual dispersion of a fiber link in the mesh network. A de-interleaver is coupled to the dispersion compensator for de-interleaving odd and even channels of wavelength division multiplexed (WDM) signals transmitted across the fiber link. A delay device is coupled to the de-interleaver for introducing a delay to the odd channels or the even channels of the WDM signals to decorrelate the odd and even channels and substantially reduce inter-channel cross-phase modulation.

A method for optical data transmission in a wavelength multiplexing system having at least two transmission channels of different wavelengths includes determining at least one value which is a measure of a physical property of an optical data transmission path of the wavelength multiplexing system; and automatically adjusting a transmission parameter of at least one of the transmission channels as a function of the determined at least one value.

The invention discloses an optical network service restoration method and system based on a resource convergence graph. The method includes the steps that failure nodes in an optical network are regularly detected, and the failure nodes are distinguished as intermediate nodes or convergence nodes; if the failure nodes are the convergence nodes, the convergence nodes are reselected, and synergetic first topological information of the optical network and a packet-based network is acquired; weight values of multiple paths are calculated through weight values of multiple network links in the first topological information, and the path with the minimal weight value is selected as the finally-selected path. According to the method, in order to solve the problem that service restoration is difficult after failure occurs in the packet-based network borne by the optical network, the path with the minimal weight value from a source node to a host node calculated through the resource convergence graph is used for service restoration, network services can be quickly restored after network nodes fail, overall cost is reduced, and the utilization rate of network resources is increased.