52 results about "Optical burst switched" patented technology

A method and system for routing high-speed data to and from SANs (Storage Area Networks and Server Area Networks) via optical burst-switched (OBS) networks. OBS network components, including edge nodes and switching nodes, are coupled between SAN islands. In one embodiment, the OBS network comprises a photonic burst-switched (PBS) network. Under one scheme, a PBS edge node and SAN gateway are co-located at the interface to the SAN, while a plurality of PBS switching nodes are deployed between the PBS edge nodes. Under another scheme, PBS switching / edge nodes are co-located at respective SANs. This scheme employs an external gateway protocol (EGP) for routing data via selected route segments. Data going to and received from a SAN is packaged as Fibre Channel Frames. Data transmitted via the PBS network is converted into PBS frames having encapsulated Fibre Channel Frames. The schemes also support interfaces with legacy networks, such as LANs and WANs.

Routing mechanisms for routing data via a plurality of optical switched (OS) networks, such as optical burst-switched (OBS) networks. A plurality of OBS networks are connected to form an enterprise network, which may further include non-OBS networks such as LANs and the like. Each of the OBS networks is modeled as an autonomous system (AS), and one or more edge nodes of each OBS network are designated as external gateway protocol (EGP) routers. Each EGP router maintains a routing table identifying routes that may be used to reach destination networks. The routing table is dynamically updated via update messages that comprise an extension to the Border Gateway Protocol (BGP) and account for optical routing considerations particular to OBS networks. In response to a routing request, data is sent from an internal node using an internal routing protocol to a BGP router edge node. The BGP router edge node then determines a next network hop based on current routing information in its routing table, and the data is routed using an external routing protocol. At the same time, data is routed within an individual OBS network using an internal routing protocol under which data are sent as data bursts via reserved lightpaths.

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.

A control device for controlling the optical data transmission in an optical burst switching mode between a source computer and a destination computer, the control device being connected to the source computer and to the destination computer and being adapted such that in case of a burst to be transmitted from the source computer to the destination computer, the length of the burst is determined based on a parameter indicating an available buffer size of the destination computer, and a predetermined timeout value parameter indicating a time after which improper burst transmission is assumed to have been occurred. After the burst length is determined and the traffic starts to be accumulated, a proposed burst reservation and transmission scheme, namely random burst eligibility time method, is used to deliver the burst.

An optical network scheduling device (10) including a plurality of schedulers (16) each corresponding to a respective channel in the optical burst switch network and configured to maintain a transmission schedule for the respective channel; and a controller (12) configured to receive a burst transmission request and to select at least one of the schedulers as a selected scheduler schedule a burst transmission.

The present invention is directed to a QoS-aware unified protocol that is applicable in the control plane of software defined networks, which can bring following benefits and includes optical burst switching protocol mainly requires four key operations; burst assembling, burst routing, burst scheduling, and control packet signaling protocols.

A multi-granular light router based on optical burst exchange can support both burst-class and dynamic wavelength routing-class light exchange. Its core optical router uses dual-light-switch matrix for different exchange granularities. Its marginal optical router can support electric IP access and optical dynamic wavelength routing network access. Any input wavelength can be converted to any output wavelength, so the whole network has dynamic wavelength routing power. A mixed signalling mode is used. It is compatible with the current optical network with dynamic wavelength routing and the frture optical network with burst exchange.

A communication system enabling a switching procedure for a multiple-input multiple-output orthogonal frequency division multiplexing (MIMO OFDM) based flexible rate intra-data center network DCN, includes a MIMO OFDM DCN with optical burst switching OBS capability, an optical burst switching OBS procedure for influencing the MIMO OFDM DCN, and a centralized control configuration coupled to the MIMO OFDM DCN and enabling a software defined network SDN configuration in the communication system.

An optical network, having an optical communication link and first and second routers. The first router receives and classifies data, then forms a data burst based on destination. The first router sends an encrypted header and the data burst via the optical link. The second router, at least one hop from the first router, receives, decrypts and authenticates the header. Then, the second router extracts data burst information from the header and determines whether the address of the second router is the destination address for the data burst. If so, the second router receives the data burst and sends data to an appropriate line interface. If not, the second router selects and reserves a wavelength on a second optical link for the data burst. The second router selects an encryption key for the header, encrypts and sends the header, and then routes the data burst to the selected wavelength.

The invention discloses a poll continuous multicast protocol based on repeating confirmation mechanism in light mutation exchange rig net. It supports reliable service, acquires the reliability through retransmitting and confirmation mechanism; the dispatcher processes the multicast queue with poll mode; when there has several data packet reaches the target joint, the target joint selects one to receive from the several data packet; if the joint can not receive the mutation packet to be signed, one or several joints in the multicast addresses does not receive the data packet transmitted from the source joint, the source joint retransmits the data packet, guarantees all the joints received the data. The method decreases the complexity of protocol, and the protocol is simplified through the smallest control.

Provided is a burst scheduling method in an Optical Burst Switching (OBS) system in which a plurality of nodes are connected through a mesh-type network. When a TDB which has used many network resources via a plurality of nodes and an SHG burst generated in a previous node, among bursts including BCPs transmitted from the previous node, compete in a current node so as to occupy a specific output channel, scheduling is performed to cause the TDB to have a higher priority than the SHG burst such that the corresponding output channel is occupied. Therefore, it is possible to minimize a burst loss in a network node, thereby enhancing the overall system performance.

A Wavelength Division Multiplexing (WDM) multi-mode switching system and method and method provides concurrent switching 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 in the WDM multi-mode switching systems may provide a traffic management module that processes incoming data and routes the data for transmission in an electronic packet switching (EPS), optical burst switching (OBS), or optical circuit switching (OCS) modes via a WDM link.

A multiple-plane OBS node comprises N input ports, N 1×N switches, N switching planes, N2 FDLs, N optical couplers, and N output ports, each input port is connected with the input of a corresponding 1×N switches, the N outputs of each 1×N switch are connected with a corresponding input of each switching plane respectively, a corresponding output of each switching plane is connected with the input of the same corresponding optical coupler via a respective FDL, and each output port is connected with the output of a corresponding optical coupler, wherein N is an integer.

The invention pertains to a data transmission method in the optical network communication technology. The invention organically combines optical circuit switching (OCS) and optical burst switching (OBS) based on the original physical topological network, reserves wavelength in each physical link to establish an overflow transmission light path, transmits the discarded data packets of the original OBS due to booking collision into the light path to transmit continuously, accordingly resolving the problem of packet loss due to one time booking collision; most of the data packets in the network operation adopts an OCS mode transmission, and adopts an OBS mode overflow transmission light path to transmit the data packets to destination nodes when the data conveying capacity has a high a burst performance; and can switch back to the OCS mode transmission when the OCS light path is smooth, accordingly can flexibly adjust the transmission modes according to the current state of network and significantly reduce the packet loss rate. The present invention thus not only has high efficiency of OCS but also has flexibility of OBS, and has features of strong transmission capability and adaptability to burst data streams, rapid network transmission, high reliability, no additional optical devices and the like.

The present invention proposes a method to control congestion in an Optical Burst Switched (OBS) network. The method consists in dropping probabilistically a data burst based on an average delay applied to a set of data bursts. Data bursts start being preventively dropped when the average delay goes beyond a pre-determined threshold. <??>At the edge of the OBS network, one may further segregate data packets into 2 distinct flows, depending on whether or not they convey congestion responsive traffic, each flow being next aggregated into distinct data bursts. The content type of a data burst is indicated in some field of the burst header packet (BHP), allowing the core routers downwards to selectively drop data bursts.

The invention provides a designing method for the light bursting exchange control wavelength, Both the control wavelength and the message wavelength of the typical light bursting exchange system take 1550nm as the ITU standard DWDM wavelength. The invention takes 1310nm as the control wave length and 1550nm as the message wave length, and selects 1310 / 1550 broad band wave multiplier to multiply and inverse multiply the control wavelength and the total message wavelength to realize the light transmission of the light bursting exchange system.

Provided is a method for transmitting a burst in an optical burst switching system, in which when a burst is generated at an originating node, a burst control packet is transmitted to a destination node by way of a plurality of nodes and then a data burst is transmitted after a pre-allocated offset time. The method includes the steps of obtaining an arrival time of data bursts that survive competition to occupy an output channel among data bursts transmitted to the next node by way of the current node using offset time information in burst control packets for the survived data bursts, checking whether an empty void is present between the survived data bursts by using the obtained arrival time of the survived data bursts, and generating a new data burst originating from the current node, inserting the newly generated data burst into the checked empty void, and transmitting to the next node. This method can improve channel utilization and maximize performance of the optical burst switching system.

A system and method for a cell switching optical network. A block of data is buffered at an edge node and sliced into data slices. Slice headers are pre-appended to each data slice. The data slices are then scheduled for transmission onto an optical switching network during fixed time slots defined on a per carrier wavelength basis.

The invention is an unique control method that maintains the bandwidth efficiency of Optical Burst Switched, Labeled Optical Burst Switched, and other burst or packet switched networks. The invention also combines in a novel manner the delayed Reserve-a-Fixed-Duration (RFD) class of switching techniques and special classes of slow Switching Elements.

A multiple-plane OBS node comprises N input ports, N 1×N switches, N switching planes, N2 FDLs, N optical couplers, and N output ports, each input port is connected with the input of a corresponding 1×N switches, the N outputs of each 1×N switch are connected with a corresponding input of each switching plane respectively, a corresponding output of each switching plane is connected with the input of the same corresponding optical coupler via a respective FDL, and each output port is connected with the output of a corresponding optical coupler, wherein N is an integer.

A system and method for implementing collision resolution scheduling of satellite optical burst switch. According to the topology of space-based broadband transmission backbone network and the statusof each switching node, through the scheduling method of network resources pre-allocation, at that boundary of the space-based broadband transmission backbone network, the data to be transmitted and exchanged to the space-based broadband transmission backbone network is controlled, the switching time and the forwarding path of each optical burst data entering into the space-based broadband transmission backbone network are planned in advance, and the collision resolution scheduling of the optical burst data exchange of the space-based broadband transmission backbone network is realized. The optical burst data of the space-based broadband transmission backbone network is generated by the electric domain. After completing the electro-optical conversion at the edge node of the backbone network, the optical burst data enters the backbone network for optical burst exchange. After reaching the destination edge node, the optical burst data is converted, and then the data is sent to the processing terminal to complete the data routing exchange process. Through pre-planning and scheduling, the system can resolve the collision of satellite optical burst switch by using network resources.

The invention is a fast bit synchronous circuit, including a nonlinear processing module, an injection synchronous phase-locked loop composed of an injection voltage controlled oscillator, an active loop filter, a frequency and phase identifier and a reference clock and a D trigger. A burst pulse signal code flow is preprocessed nonlinearly and then inputted to the injection synchronous phase-locked loop so as to realize fast synchronous clock oscillation output. The input reference clock of the phase identifier is provided by the system or generated by local oscillation and has no relation with data stream, thus able to meet the function of fast bit clock extraction of the burst signal. The invention can be widely applied to communication field in need of processing burst pulse code flow, such as passive optical network (PON), optical burst switching (OBS), optical packet switching (OPS) devices, instruments, modules, etc.

The invention provides an optical burst switching (OBS) channel scheduling method based on an optical buffer (OB). The method comprises the following steps: after receiving a burst control packets (BCP), if channel distribution based on the existing channel scheduling algorithm fails, inquiring whether an available OB exist, if yes, adding a buffer unit to the burst packet arriving time, and then carrying out inquiry again; and if distribution still fails, repeating the operations until the distribution is successful, or the buffer capability is exceeded; if the distribution is successful, updating a route table, bias time, buffer time, a buffer memory use condition and other information, and forwarding the BCP; and if the forwarding fails, abandoning the BCP. By utilizing the method, the advantages of the OB are effectively utilized, and the property of an OBS network is improved compared with the traditional fiber delay line (FDL) method.

A method, system, and node for implementing automatic protection switchover in an optical burst switch ring. The method comprises: a primary node and a secondary node separately performing optical power monitoring on separate channels, and aggregating monitoring results to the primary node; when determining, according to the monitoring results, that a fault occurs, the primary node sending a switchover operation instruction to the secondary node; and the secondary node performing a switchover operation and entering a protection working state. By using the present invention, a protection switchover mechanism is introduced to the optical burst switch ring, processing on the fault is implemented, and communication quality in the optical burst switch ring is ensured. Further, in the method of the present invention, different switchover operation manners are used for a data channel and a control channel, which meets a protection requirement of a centralized-control optical burst switch ring for a control channel loop, ensures that the control channel can still work in a primary-secondary ring working mode, considers utilization of a transceiver on a data channel, and brings availability of a transceiver on each node into full play.

A method for efficiently allocating incoming burst data to output channels over an optical burst switching network when the number of incoming channels is greater than the number of outgoing channels. To this end, BD transferred on at least two incoming channels are grouped to BDs that do not block each other. BDs in a group are allocated to and transmitted on one outgoing channel. BDs in the group not assigned to the output channel are repeatedly delayed, discover time slots in which BDs in the group assigned to the output channel are not transferred, and use the discovered time slots for the transmission.

A kind of channel parallel scheduling device in optical burst switching, realizes optical burst switching channel scheduling of LAUC-VF type, composes of the main control module, a number of single-channel processing module and channel choice modules. The main control module receives control packets of the sudden, analysis the time requested in accordance with data packets unexpected, and sends the time information to all the single-channel processing module at the same time, all the single-channel processing module search time interval in parallel, if there can be time interval, makes the related data transmit to the channel option module, channel choices module compares with the parallel channel levels and find the optimal channel, and then returns to the main control module, the main control module updates according to the scheduling results, complete scheduling process. This invention achieves a channel parallel processing, searches the idle time of channel spacing parallel at the same time, as well as selects the optimal parallel channel, shorten the processing time of control packet in OBS nodes, and upgrade OBS network performance.

An optical burst switching (OBS) system and a method using duplicate optical burst transmission is provided. In accordance with the present invention, optical bursts do not have the same priority when the duplicate optical bursts are transmitted in an OBS network so that a burst loss rate due to blocking can be reduced. Optical bursts do not have the same priority when the duplicate optical bursts are transmitted in an OBS network, so that a burst loss rate due to the blocking can be reduced. After an optical burst control packet is transmitted on a signal channel using a unidirectional reservation manner in the OBS, a problem such as optical burst loss due to the blocking can be prevented even when the optical burst is transmitted on a data channel after an offset time is elapsed without any response messages.