67 results about "Optical circuit switching" patented technology

A network traffic collecting and monitoring system includes a traffic processing and dispatching module that pre-processes network traffic received from traffic tapping modules. A traffic collecting module receives and consolidates the network traffic and sends the network traffic to higher-layer applications. A controller dynamically configures the traffic processing and dispatching module to achieve optimal measurement accuracy and network coverage.

The present disclosure describes systems and methods for reconfiguring the links made by a plurality of optical circuit switches between the nodes of the first layer and the nodes of the second layer that reduces the throughput loss when the network transitions form a first logical topology to a second logical topology. More particularly, the first logical topology is realized by a specific physical topology, while the second logical topology may be realized by one or more physical topologies. The disclosure describes a method for selecting a second physical topology from the one or more physical topologies that will realize the second logical topology while reducing the number of links within each of the optical circuit switches that must be reconfigured (i.e, disconnected from their present ports and reconnected to new ports within the optical circuit switch) to transition from the first to second logical topology.

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.

The invention discloses an on-chip optical router for hybrid switching, which mainly solves the problems of high communication delay, low network transmission efficiency and low resource utilization rate facing a single exchange mechanism in the existing on-chip optical router. The router comprises an OCS (Optical Circuit Switching) part and an OPS (Optical Packet Switching) part, wherein each part is composed of an electric field module and an optical field module, the OCS electric field module establishes an optical link for the OCS optical field module according to electric link establishing information before transmitting messages, and the OPS electric field module provides control information for the OPS optical field module in a transmitting and switching process of optical packets. The OCS part is used for transmitting the messages for using an OCS switching mechanism, and the OPS part is used for transmitting the messages for using an OPS switching mechanism. The on-chip optical router respectively optimizes performances of different types of messages, has the advantages of less communication delay, high network transmission efficiency and high resource utilization rate, and is suitable for interconnections and communications in an on-chip optical network.

An optical switching system is described. The system includes a plurality of interconnected wavelength selective switching units. Each of the wavelength selective switching units is associated with one or more server racks. The interconnected wavelength selective switching units are arranged into a fixed structure high-dimensional interconnect architecture comprising a plurality of fixed and structured optical links. The optical links are arranged in a k-ary n-cube, ring, mesh, torus, direct binary n-cube, indirect binary n-cube, Omega network or hypercube architecture.

An optical packet switching system in which transmission quality, reliability, and system management in optical packet switching control are improved. An optical packet switch section includes semiconductor optical amplifiers as gate switches multistage-connected on paths along which optical packets sent from a plurality of input line cards are transmitted and performs optical packet switching by broadcasting the optical packets to a plurality of gate switches, by selecting the optical packets by ON / OFF gating operation of the gate switches, and by absorbing noise signals which flow along non-selected paths by putting gate switches at a final stage into the OFF state. A switch control section exercises ON / OFF drive control over the gate switches in the optical packet switch section on the basis of port connection requests from the plurality of input line cards so as to generate requested paths.

The invention discloses an optical interconnection network system of a data center based on a hyper-cubic cluster and a communication method, which are mainly used for solving the problems of insufficient bandwidth of a network link and high network expense and energy consumption of the traditional data center. The network system provided by the invention comprises N top-of-rack optical switches, N top-of-rack electric switches and N*s servers, wherein each top-of-rack electric switch is connected with s servers and one of the top-of-rack optical switch to form N basic network units; the N basic network units are divided into k clusters, the basic units in the same cluster are interconnected through the top-of-rack optical switches to form a hyper-cubic topological structure, and the basic units in different clusters are interconnected through the top-of-rack optical switches to form an annular topological structure; and packet switching is adopted in the communication of the server of the same basic unit, and multi-wavelength-based optical circuit switching is adopted in the communication of the servers of different basic units. By using the optical interconnection network system and the communication method, the port number of the optical switches and network blockage conditions can be effectively reduced, the expandability of a network can be ensured, and the throughput and the performance of the network can be improved.

An optical switching system is implemented by providing a transmitting section with a preparatory transmitted optical signal selector and a working transmitted optical signal splitter, which are each implemented by a 1x2 optical space switch, and by providing a receiving section with a receiving optical switch which is implemented by a 2x2 optical space switch, and with a preparatory receiving optical gate which is implemented by a 1x2 optical space switch. This makes it possible to switch between the working system and preparatory system without employing any 4x4 optical space switch, thereby implementing a practical optical switching system without causing such problems as communication interruption during maintenance or impairment of transmission path working efficiency.

Asynchronous optical data is aligned with synchronous convergence points in an optical packet switching system. The convergence points can be any place where data enters an optical packet switching element, buffer stage, switch fabric, etc. The arrival time for data approaching the convergence point is compared with a reference signal associated with the upcoming convergence point. The comparison is used to identify the amount of time-shift required to align the approaching data with the reference signal. Control information is derived according to the comparison and used to control an optical data aligner that synchronizes the data with the convergence point.

The invention discloses an optical interconnection network system and communication method in a supercomputer. The system disclosed by the invention comprises global optical switches, array electric switches and electric routers, wherein every 8 electric routers are interconnected to form a cube-like calculation cluster, and c calculation clusters can form a supercomputing node; k supercomputing nodes, 8 array electric switches and one global optical switch form a supercomputing array; and M supercomputing arrays are fully interconnected to form a network system. According to the system disclosed by the invention, the communication among the global optical switches, the array electric switches and the electric routers can be achieved by adopting two switching mechanisms which are electric packet switching and optical circuit switching; and according to the optical interconnection network system and communication method disclosed by the invention, relatively high network extensibility can be achieved, the utilization rate of links can be increased, different switching mechanisms can be supported, and the congestion of the network can be reduced.

Asynchronous optical data is aligned with synchronous convergence points in an optical packet switching system. The convergence points can be any place where data enters an optical packet switching element, buffer stage, switch fabric, etc. The arrival time for data approaching the convergence point is compared with a reference signal associated with the upcoming convergence point. The comparison is used to identify the amount of time-shift required to align the approaching data with the reference signal. Control information is derived according to the comparison and used to control an optical data aligner that synchronizes the data with the convergence point.

An optical packet switching system includes optical packet switching apparatus and an optical packet transmitting apparatus. The optical packet switching apparatus includes client optical delay units for delaying optical packet signals, network optical delay units for delaying one of the network optical packet signals, the network optical delay unit having a longer delay time than the client optical delay unit, an optical switch unit for switching the route of the inputted client optical packet signal so as to be sent out, an optical switch control unit for controlling the optical switch unit. The optical switch control unit is configured in such a manner as to detect a free time slot. The optical packet transmitting apparatus adjusts transmit timing, with which the client optical packet signal is sent out, in such a manner that the client optical packet signal is inserted into the free time slot.

An optical packet switching device is provided with: a first input unit and a second input unit for receiving an optical packet signal having destination information and priority information; a first demultiplexer and a second demultiplexer for branching the optical packet signal; an optical switch unit for routing one of branched optical packet signals; a first analyzer unit and a second analyzer unit for analyzing the header of the other branched optical packet signal so as to detect the destination information and the priority information; and an output competition determination unit for checking for temporal competition of a plurality of optical packet signals based on destination information and for determining whether the optical packet signals should be transmitted or discarded based on priority information when there is competition.

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 method is provided for improving performance of a distributed computing task being executed by computing devices interconnected by an optical switching fabric. Traffic flows between a plurality of nodes of a MapReduce application using an interconnected optical switching fabric are monitored. One or more optimizations for the interconnected optical switching fabric are determined based on the monitoring of the traffic flows. The interconnected optical switching fabric is reconfigured to implement the one or more determined optimizations.

An optical switching system is described. The system includes a plurality of interconnected wavelength selective switching units. Each of the wavelength selective switching units is associated with one or more server racks. The interconnected wavelength selective switching units are arranged into a fixed structure high-dimensional interconnect architecture comprising a plurality of fixed and structured optical links. The optical links are arranged in a k-ary n-cube, ring, mesh, torus, direct binary n-cube, indirect binary n-cube, Omega network or hypercube architecture.

An optical reconfigurable service ring (RSR) architecture based on a RSR channel and WDM channel plan matrix, and method for operation in a fiber network that provides WDM wavelength networking functionalities such as provisional wavelength services, optical circuit switching, optical layer 2 packet switching, optical storage switching, and optical layer 3 packet routing, are proposed. In one embodiment, sixteen wavelength are dynamically switching, routed, or distributed among five optical add / drop nodes using narrowly wavelength tunable transmitters and fixed optical add / drop multiplexer modules.

The present invention relates to a projection display optical system, including a light source, an optical circuit switching device and a prism group. the prism group is placed between the optical circuit switching device and a projection device; andon the optical circuit switching device a microreflector array formed from several microreflectors is inclued; at least two gaps are formed by said prism group, so that the light entered into the prism group can produce total reflection at the interface position of first prism and gap, then is entered into the optical circuit switching device. Said invention also provides the working principle of said optical system and projection method of said projection device.

The invention discloses an optical on-chip network system of non-blocking communication and a communication method thereof and mainly solves the blocking problem of the existing optical on-chip network system. The optical on-chip network system comprises a light transmission network and an electric control network; each node in the light transmission network comprises an IP (Internet Protocol) core, a sending unit, a receiving unit and a light exchanging device, wherein the sending length of each sending unit is fixed and the light exchanging device is formed by light vertical switches; and the inner structures of all the receiving units are the same. The communication method comprises the following steps of: firstly, establishing a two-dimensional coordinate system for the light transmission network and reading coordinates of a source node and a target node; secondly, opening a needed micro-ring resonator by the electric control network according to the source node and the target node; and finally, transmitting the light information to the target node by the light transmission network to be processed, and closing the opened micro-ring resonator. The optical on-chip network system disclosed by the invention combines a wavelength division multiplexing technology, a space division multiplexing technology and a light circuit exchanging technology to realize the non-blocking communication of the IP cores and improve the resource utilization rate and the throughput performance of the network.

A graphene nanosheet pair array comprises an upper layer of graphene nanosheets, a lower layer of graphene nanosheets and a quartz substrate. The quartz substrate is arranged between the upper layer of graphene nanosheets and the lower layer of graphene nanosheets, the upper layer of graphene nanosheets and the lower layer of graphene nanosheets comprise multiple graphene nanosheets uniformly distributed at the top and the bottom of the quartz substrate, and the quartz substrate is used for fixing and separating the upper layer of graphene nanosheets and the lower layer of graphene nanosheets. A multifunctional optical device based on the graphene nanosheet pair array structure is realized and can serve as an active plasma band elimination filter with the resonant wavelength tilt of transmissivity lower than 0.2% or a high-sensitivity refractive index sensor with the sensitivity reaching up to 4879 nm / RIU or a two-channel optical circuit switch with the modulation depths of the resonant wavelength tilt being 0.9551 and 0.9399.

The invention relates to a switch processor matched with a core node of a hybrid optical switching network in an optical network communication technology. The switch processor comprises a wave separator set, a wave combiner set, a low-speed optical switch unit module, a high-speed optical switch unit module and tunable wavelength converters, wherein the wave separator set and the wave combiner set are provided with an input port and an output port; the low-speed optical switch unit module and the high-speed optical switch unit module are sequentially arranged between the wave separator set and the wave combiner set in series and respectively provided with an interface connected with a switching control unit in a node; and the tunable wavelength converters are arranged between a high-speed optical switch unit module output port and wave combiners and a low-speed optical switch unit module output port and the wave combiners. The low-speed optical switch unit module in the switch processor is used for supporting optical circuit switching, and the high-speed optical switch unit module simultaneously supports optical burst switching and the optical circuit switching; therefore the switch processor has the characteristics of flexibly, conveniently, reliably and automatically deploying hybrid optical switching modes, improving the flexibility of the optical burst switching / the optical circuit switching, the utilization rate of wavelength resources, the bearing capacity of the optical circuit switching in a network, and the like.

The invention discloses a space laser communication forwarding system based on a passive optical switch. The system consists of a ground optical signal transmitting terminal, a space forwarding system and a ground optical signal receiving terminal. A transmitting end and a receiving end for space optical communications are placed on the ground, and the space forwarding system is carried by an aircraft and only forwards optical signals without processing such as amplification, modulation, demodulation and the like, so that the complexity of a space system is lowered greatly, and the sizes, weights and power consumption of space loads are lowered. Moreover, point-to-point or broadcasting-mode forwarding of the optical signals is realized through an optical switching system. The signals are modulated on the transmitting end, and demodulated on the receiving end, so that ground-space-ground forwarding communications are realized.

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 invention discloses an all-optical time slice switching method based on time synchronization. According to the method, continuous service data streams in an optical network are assembled to periodically-repeated optical time slices in a segmented mode in a time domain and are transferred in an asynchronous transfer mode. Network nodes obtain high precision synchronization time through whole network time, an optical switch is controlled to switch optical time slices reaching at precise time points periodically to a target port, and therefore full optical switching is completed. When a connection request reaches, available routes, wavelengths and occupation time slots are calculated through source nodes according to network available time slot resource information, and are reserved through a connection management module. After resource reservation is finished, the source nodes send out optical time slices of bearer service periodically at reserved time slots. Destination nodes restore received optical time slices to original service steams. Compared with an existing switching technology, the all-optical time slice switching method has the remarkable advantages that reliable and flexible sub-wavelength granularity all-optical switching can be achieved without participation of all-optical caches and all-optical logic devices.

The present invention relates to projection lighting system. It includes a light-conducting pipe and an optical circuit switching device with light-receiving region, The light-conducting pipe is placed in the optical cirucit between light source and optical circuit switching device. The light beam emitted by means of end face of light-conducting pipe can be income into the light-receiving region in the mode of that said light beam and plane normal of light receiving region are formed into a certain angle, and its producted projection pattern form can produce a tension change relatively to light-conducting pipe end face form along said off-axis angle change direction, and the end form of ligh- conducting pipe is a parallegram whose inner angle along off-axis angle direction is larger than adjacent inner angle.

The invention belongs to the field of quantum communications and quantum key distribution (QKD) networks, particularly relates to a route selection system and a route selection method, and discloses the route selection system and the route selection method of a QKD network and on the basis of optical path switching. Through the route selection system and the route selection method of the QKD network and on the basis of the optical path switching, the problems that the route selection ability of an existing QKD network is poor, and therefore the existing QKD network is simple in topology and small in scale are solved. The route selection system of the QKD network and on the basis of the optical path switching comprises optical path switching nodes, wherein the number of the optical path switching nodes is M, a call protocol sub module of each optical path switching node can automatically find a topology structure table, sent by the module through the QKD network topology, of the QKD network and obtain a table including all feasible communication paths from a QKD communication request source node to a destination node, a pilot signal protocol path selection sub module is used for selecting an optimal communication path from the table including all the feasible communication paths, the optimal communication path is used as a current communication path, a pilot signal protocol path confirmation module is used for confirming the selected optimal communication path, and then a communication channel from the source node to the destination node is built. The route selection system and the route selection method of the QKD network and on the basis of the optical path switching are suitable for the communication field.

An optical circuit switching matrix includes a plurality of optical ports, each optical port being optically coupled to a respective one of a plurality of user nodes and an optical coupler having at least one input port optically coupled to the plurality of optical ports, and an output port. The optical circuit switching matrix also includes a wavelength demultiplexer having an input optically coupled to the output port of the optical coupler, and a plurality of output ports, each output port being optically coupled to a respective one of the plurality of optical ports.

An optical packet switching system includes: an optical packet transmitter device configured to transmit an optical packet signal; and an optical packet switching device configured to route and output an input optical packet signal. The optical packet transmitter device is configured to adjust gap time between optical packets transmitted. The optical packet transmitter device adjusts the gap time to a fixed value defined by time required for switching in the optical packet switching device.

The invention discloses an optical link protection system integrated with an optical time domain reflectometer (OTDR), relating to the optical link protection field, and comprises a sending terminal and a receiving terminal which are in connection through fibers, and are both provided with an optical link protection unit used for optical link switching. The optical link protection system is integrated with an OTDR used for finding fiber fault points. The optical link protection system can obtain fiber fault conditions the first time so as to shorten fault treatment time.