55 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.

A method for lightpath restoration in a reconfigurable optical network comprises the steps of naming each network addressable element in said reconfigurable optical network, determining current topology in said reconfigurable optical network, determining current resources in said reconfigurable optical network, requesting establishment of a lightpath, requesting reservation of restoration capacity, allocating the lightpath, and reserving the restoration capacity. Also disclosed is a method for lightpath restoration that comprises the steps of reserving restoration capacity, detecting transmission failures in the reconfigurable optical network, handling exceptions as a result of transmission failures, and allocating transmission capacity.

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 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.

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.

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 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.

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.

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 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.