TW202131650A - Optical tunnel switching network system - Google Patents

Abstract

A multi-plane optical tunnel switching network system architecture is provided, which adopts torus topology networks and wavelength selective switches (WSS), and integrate the software defined network (SDN) mechanism for wavelength dispatch. All nodes of the optical tunnel switching network system use WSS modules. Communication between the nodes can use multiple wavelengths to establish tunnels. A tunnel between any two nodes can be a direct tunnel or a relay tunnel. Wavelength dispatch in each plane is independent. Each plane does not communicate with one another through WSS. A tunnel between two nodes can adjust the number of wavelengths on demand dynamically to accommodate traffic volume and to avoid traffic loss. The optical circuit of another plane can be used when the optical circuit of the tunnels of a plane are in malfunction, thereby providing fault tolerance to improve network reliability.

Description

Optical tunnel switching network system

The invention relates to a multi-plane optical tunnel switching network system architecture, which is suitable for medium and small data center networks. Each node of the network communicates with each other through optical tunnels, and the network takes the shape of a two-dimensional loop topology (Torus Topology), and each node is connected by east-west and north-south ring links. The network is under the control of the Software Defined Network (SDN) controller. The wavelength resources used by each node are arranged, the routing of various traffic is set, and flexible scheduling according to demand is required to maintain the network’s Availability.

The cost of the switch increases linearly as the data rate rises, and the large-capacity electrical switch needs to provide a larger power supply, and a larger size is required for parallel processing. Therefore, all-optical switching technology is proposed to solve these problems in order to reduce power consumption and increase switching capacity. Optical switching technology can be divided into optical circuit switching (Optical Circuit Switching, OCS for short) and optical packet switching (Optical Packet Switching, OPS for short). The most common product on the market at present is the OCS switch, which is a mature and developed technology. The Optical Frame Switch (OFS) is also under development. OFS is to exchange packets or traffic destined for the same purpose into a frame (Frame) to increase its capacity. Small frames require fast optical switches, but High-speed optical switching technology is not mature now. At present, the widely used Micro-electro-mechanical Systems (MEMS) and Liquid Crystal on Silicon (LCoS) technologies are all milliseconds (ms) switching speeds, which makes it possible to use optical frame switch technology. The frame needs to be very large. For example, under a 100Gbps link, the frame size must be at least 12.5M bytes or more, which will cause a large delay in the optical frame switch, thus affecting the performance of the optical frame switch. Therefore, an optical tunnel switching (Optical Tunnel Switching) technology is proposed. This technology mainly uses high-density wavelength division multiplexing (Dense Wavelength Division Multiplexing; referred to as DWDM) technology to establish many tunnels with multiple wavelengths to provide point-to-point connections. Therefore, optical tunnel switches require many wavelengths for point-to-point non-blocking connections.

The optical switch mentioned in my country's patent number I552536 is composed of a commercial Wavelength Selective Switch (WSS). The network system of the optical data center is implemented in a three-layer architecture, including multiple first layers. An optical switch, a plurality of second-layer optical switches, and a plurality of third-layer optical switches. Wherein, a plurality of first-layer optical switches are connected to each other through ribbon fibers to form a pod. A plurality of second-layer optical switches are connected to each other through ribbon fibers to form a macro pod, and each second-layer optical switch is connected to all first-layer optical switches in a group. Finally, multiple third-layer optical switches are also connected to each other through ribbon fibers, and each third-layer optical switch is connected to all second-layer optical switches in a giant group. The patent is mainly aimed at the optical data center network system, using a three-layer pyramid structure to achieve. The patent emphasizes all-optical switching, the data transmission path does not need to undergo photoelectric conversion processing, and the three-layer architecture is suitable for large-scale networks. However, in this three-layer architecture, the internal components and lines of each layer of optical switches are different, and the external wiring of each layer of optical switches is also different, which increases the complexity of the network composition. The present invention uses a two-dimensional loop (Torus) topology structure, each section The internal components of the points are the same, and the network structure is relatively simple and suitable for small and medium-sized networks. Although the data transmission path may undergo a photoelectric conversion due to the Relay Tunnel, the result is a simple structure and easy maintenance.

In the US patent US 8705954 B2, it is mentioned that its network is composed of an optical switch matrix (Optical Switch Matrix, OSM) and optical components (Optical Components) of each node. The optical element connects the OSM with the Top Of Rack (TOR for short) switch. Optical components include WSS, multiplexer (MUX) responsible for uploading local data, and coupler (Coupler) and demultiplexer (DeMUX) responsible for downloading local data. The TOR of each node is configured with transceivers (Transciever) of different wavelengths to connect with the optical components. The core of its network exchange is OSM. OSM uses MEMS technology to realize the flexibility of the data path. The TOR of each node can also forward the data sent from the OSM, making the TOR a hop in the data path. The data path can form a hop-by-hop, and each hop represents one photoelectric Conversion. The biggest feature of this patent is the flexibility of the optical path design, but the reconstruction time for each change of the optical path is at least a few milliseconds.

In view of the shortcomings of the aforementioned system and method, the purpose of the present invention is to propose a multi-plane optical tunnel switching network system architecture. This technology mainly uses DWDM technology to establish multiple tunnels with multiple wavelengths to provide point-to-point connections. Therefore, optical tunnel switching requires Many wavelengths make point-to-point non-blocking connections. The invention is suitable for data center networks and adopts an optical tunnel switching module with mature technology. In the era when the amount of data is growing rapidly, providing a more energy-efficient and easy-to-use Maintenance plan. In particular, the world has begun to develop 5G commercialization process, whether it is in the core network or edge computing field, there is room for development.

The present invention provides an optical tunnel switching network system, which includes a plurality of nodes and a plurality of planes are defined, wherein each node includes a software-defined network switch, a plurality of wavelength selective switches, a plurality of multiplexers, and a plurality of cyclic solutions. Multiplexers, and a plurality of servers, and each of the planes corresponds to one of the wavelength selection switches, one of the multiplexers, and one of the cyclic demultiplexers at each of the nodes, and the plurality of The multiple wavelength selective switches on the same plane of the two planes form multiple horizontal loops and multiple vertical loops with a two-dimensional loop topology, and the software-defined network switch of each node connects the plurality of nodes of each node Multiplexers, the plurality of cyclic demultiplexers, and the plurality of servers, and each of the wavelength selective switches connects the multiplexer and the cyclic demultiplexer of the same node and the same plane And the plurality of nodes are used for intercommunication signals of a plurality of optical tunnels formed with a plurality of wavelengths.

In addition, the present invention uses DWDM technology to provide communication between network nodes with multiple wavelengths as optical tunnels, and the network architecture adopts a two-dimensional loop topology. Network X-axis X-node, nodes Y Y-axis, and therefore a total of X × Y nodes. In order to improve traffic flow, Z planes are used, but only the first plane and the Z plane are shown as examples.

If any two nodes on the X-axis communicate at one wavelength, the X-axis optical tunnel requires X ×( X -1) different wavelengths (λ); if any two nodes on the Y-axis communicate at one wavelength, the Y-axis optical tunnel The tunnel requires Y × ( Y -1) different wavelengths. Therefore, the total required number of wavelengths is W :

W = X ×( X -1)+ Y ×( Y -1)

If Y = X then

W = X ×( X -1)+ X ×( X -1)=2 X ² -2 X

Can be obtained after calculation

X =(1+SQRT(2 W +1))/2; SQRT is the square root function

Therefore, if W = 48, then X = 5.42 and take its integer to get the maximum number of nodes to be 25 (5×5). Similarly, if W = 96, X = 7.45 and take its integer, the maximum number of nodes is 49 (7×7). Any node can use these wavelengths to create a through tunnel with other nodes on the same X-axis loop or the same Y-axis loop. For example, when X = Y = 5, there are only 8 direct tunnels from any node to other nodes (4+4), but 24 tunnels from each node to all other nodes, so the other 16 tunnels must be transferred through the relay station node. catch. A total of 600 tunnels (24×25) are required for the 5×5 network. Similarly, when X = Y = 7, there are only 12 direct tunnels from any node to other nodes (6+6), but each node to all other nodes requires 48 tunnels, so the other 36 tunnels must pass through the relay station node Transfer. A total of 2352 tunnels (48×49) are required for the 7×7 network. These relay station transfer tunnels will occupy the bandwidth of the through tunnel. Therefore, multiple planes are required to increase the traffic of the network. The number of planes required depends on the number of nodes and the demand for the traffic of the network.

Each node is composed of an SDN switch, N servers, Z multiplexers (MUX for short), Z Cyclic De-multiplexers (CDMUX for short), and Z WSS. Each plane needs a WSS, MUX and CDMUX for each node. The WSS of each plane will only be connected to the WSS of the adjacent nodes in the same plane horizontally or vertically, and the WSS of different planes will not be interconnected. This multi-plane architecture can not only increase the network traffic, but also increase the stability of the network and has the ability to tolerate obstacles. A node can be connected to N servers. These servers collect data and classify them through an SDN switch, gather the data to the same node, and then send them to the MUX to send ( X + Y -2) wavelengths to the DWDM signal. To WSS, WSS will select different wavelengths according to the settings and send them to different nodes to establish tunnels. DWDM signals of different wavelengths sent from different nodes are decomposed by CDMUX and sent to SDN switches and then sent to their corresponding servers. Other planes also have the same function, but they are used to increase network traffic. When one plane fails, the traffic can be directed to another plane to increase the reliability and stability of the network.

100: Optical tunnel switching network system

200xy, N _x,y : the node of the optical tunnel switching network system, xy represents the node coordinates (x,y)

210xyz: Wavelength Selective Switch (WSS for short), xy means node coordinates (x, y), z means plane ordering, and so on

220xyz: Multiplexer (Multiplexer; MUX for short)

230xyz: Cyclic Demultiplexer (CDMUX for short)

240xy: SDN switch

250xys: server, s means its sort

300: SDN controller

Figure 1 is a schematic diagram of a multi-plane loop topology optical tunnel switching network system according to an embodiment of the present invention.

Figure 2 is a schematic diagram of nodes of a multi-plane loop topology optical tunnel switching network system according to an embodiment of the present invention.

Figure 3 is an X-axis and Y-axis wavelength allocation table of each node of a 5×5 optical tunnel switching network system according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of tunnel establishment on the first plane of a loop topology optical tunnel switching network system with a 25-node dual plane according to an embodiment of the present invention.

Figure 5 is a schematic plan view of a 25-node loop topology optical tunnel switching network system according to an embodiment of the present invention.

FIG. 6 is a schematic diagram of tunnel establishment on the first plane of a loop topology optical tunnel switching network system with 49-node three planes according to an embodiment of the present invention.

Figure 7 is a schematic plan view of a 49-node loop topology optical tunnel switching network system according to an embodiment of the present invention.

The following specific examples illustrate the implementation of the present invention. Those familiar with the art can easily understand the other advantages and effects of the present invention from the contents disclosed in this specification.

Figure 1 is a schematic diagram of an optical tunnel switching network system architecture according to an embodiment of the present invention. Light tunnel switching network system using a two-dimensional loop topology 100, a light tunnel 100 system with an X-switched network nodes in the X-axis (lateral direction), Y axis (longitudinal direction) Y-nodes, a total of X × Y Nodes, each node is marked _{with N x,y.} Each node forms a loop in the horizontal and vertical directions. The optical tunnel switching network system 100 has Z planes, and each plane has the same structure. In order to make the diagram clear and easy to understand, only the first plane and the Z- th plane are shown in Figure 1, and only the first plane is shown. The detailed structure of the plane, where X , Y , and Z are all positive integers.

_{Each node N x, y} located at the same coordinate (x, y) in each plane is actually the same node, which is also marked as 200xy. Each node 200xy consists of an SDN switch 240xy, N servers 250xy1~250xyN, Z MUX 220xy1~220xyz, Z CDMUX 230xy1~230xyz, and Z WSS 210xy1~210xyz, as shown in Figure 2. , N is a positive integer. Wherein WSS 210xy1 ~ 210xyz belong to a first plane through the Z plane. Each plane has a corresponding WSS, MUX, and CDMUX at each node 200xy. For example, the third plane at each node 200xy corresponds to WSS 210xy3, MUX 220xy3, and CDMUX 230xy3. Each WSS in each node is connected to the WSS on the same plane in the previous node and the next node in the horizontal direction (that is, the X-axis direction) to form a horizontal loop as shown in Figure 1, and the WSS in each node Each WSS is connected to the WSS on the same plane in the previous node and the next node in the vertical direction (ie Y-axis direction) to form a vertical loop as shown in Figure 1. These WSS, horizontal loops and vertical loops are composed Each plane. WSSs on different planes are not interconnected with each other. Each MUX 220xy1~220xyz is connected between the SDN switch 240xy on the same node and the WSS 210xy1~210xyz on the same node on the same plane. Each CDMUX 230xy1~230xyz is connected between the SDN switch 240xy on the same node and the WSS 210xy1~210xyz on the same node on the same plane. The SDN switch 240xy is equivalent to the top of the cabinet (TOR) switch of the present invention, which connects the MUX 220xy1~220xyz and CDMUX 230xy1~230xyz of the same node through multiple optical transceivers, and also connects the server 250xy1~250xyN. The above-mentioned multiple optical transceivers are part of the SDN switch 240xy. The SDN controller 300 is connected to the SDN switch 240xy of each node 200xy and the WSS 210xy1~210xyz of each plane.

The optical tunnel switching network system 100 is used to exchange and transmit signals between the servers 250xy1~250xyN of each node. Electronic signals are transmitted between SDN switch 240xy and servers 250xy1~250xyN, and optical signals are transmitted between MUX 220xy1~220xyz, CDMUX 230xy1~230xyz, and WSS 210xy1~210xyz, which are transmitted and received by multiple optical signals of SDN switch 240xy. The device performs photoelectric conversion.

The SDN switch 240xy converts the signals sent by the servers 250xy1~250xyN to other nodes into multiple optical signals of different wavelengths through the optical transceiver, and transmits these optical signals of different wavelengths to the MUX 220xy1~220xyz. MUX 220xy1~220xyz couples the above-mentioned multiple optical signals of different wavelengths into a DWDM signal, and transmits this DWDM signal to WSS 210xy1~210xyz. WSS 210xy1~210xyz select different wavelengths according to the settings of the SDN controller, and use optical tunnels (also referred to as tunnels) in each plane to transmit the above DWDM signals to the WSS of other nodes. WSS 210xy1~210xyz also transmits the DWDM signal sent from the WSS of other nodes to CDMUX 230xy1~230xyz. CDMUX 230xy1~230xyz decomposes multiple optical signals of different wavelengths among the above-mentioned DWDM signals, and transmits these optical signals of different wavelengths to the SDN switch 240xy. The SDN switch 240xy converts the above-mentioned multiple optical signals of different wavelengths into electronic signals through optical transceivers, and then according to the Internet Protocol (Internet Protocol; abbreviation) of the server 250xy1~250xyN IP) address, and send these electronic signals to their corresponding servers 250xy1~250xyN. The SDN controller 300 can transmit control signals to each SDN switch and each WSS, and perform the wavelength assignment and distribution of the tunnel (for example, FIG. 3). In other words, the SDN controller 300 can control the wavelength of each optical signal sent by each optical transceiver of each WSS and each SDN switch through the control signal, and then set each optical signal and each tunnel mentioned above.的wavelength.

Many wavelengths are needed in the optical tunnel switching network system. In DWDM C-Band with 100GHz spacing (Spacing), the maximum number of wavelengths that can be used is 72. Generally, the number of wavelengths commonly used is 16, 24, and 40. , 48. In DWDM C-Band with a 50GHz interval, the number of available wavelengths is 96. Refer to the 96-Channel Fixed Mux/Demux (FMD96) wavelength plan (Wavelength Plan), It is aligned with the C-Band wavelength grid of the International Telecommunication Union (International Telecommunication Union; ITU), and is currently the most widely used. Of course, the number of available wavelengths at 25GHz interval can be doubled, but here, the number of available wavelengths for DWDM is 48 and 96 to illustrate the implementation of the optical tunnel switching network.

The network scale is determined by the number of wavelengths of DWDM. If the network has X × Y nodes and the number of wavelengths is W , if any two nodes on the X axis communicate with one wavelength, the X-axis optical tunnel requires X × ( X -1) different wavelengths; if the same is the Y axis Any two nodes above communicate with one wavelength, and the Y-axis optical tunnel needs Y × ( Y -1) different wavelengths.

Then W = X ×( X -1)+ Y ×( Y -1)

The number of direct tunnels at any node = ( X -1) + ( Y -1)

The number of transfer tunnels at any node relay station = X × Y -1-the number of direct tunnels

When X = Y then W = 2 X ² -2 X

Can be obtained after calculation

X =(1+SQRT(2 W +1))/2; SQRT is the square root function

When W =48, X =trunc(5.42)=5; trunc is a function that unconditionally rounds off decimals

At this time, the network scale is 5×5 nodes, the number of direct tunnels for any node is 8, and the number of relay stations is 16

The number of wavelengths that can be used = the number of direct tunnels at any node × X = 40, these wavelengths can be reused

When W =96, X =trunc(7.45)=7

At this time, the network scale is 7×7 nodes, the number of direct tunnels for any node is 12, and the number of relay stations is 36.

The number of wavelengths that can be used = the number of direct tunnels at any node × X = 84

The relay station transfer tunnel will occupy the bandwidth of the through tunnel, so it must be multi-plane to increase the traffic of the network. Assuming that a relay station transfer tunnel uses a plane, the required plane

Z = ceil (relay station transit tunnel number/through tunnel number); ceil is a function to unconditionally carry the decimal

When X = Y then Z =ceil(( X -1) ² /(2 X -2))=ceil(( X -1)/2)

If X is an odd number, then Z = ( X -1)/2; if X is an even number, then Z is the smallest integer greater than the calculated value

In the 5×5 network Z =4/2=2, in the 7×7 network Z =6/2=3, any node can be tunneled to all nodes on the network. Therefore, the 25-node optical tunnel switching network is planned as a dual plane, and the 49-node optical tunnel switching network is planned as a three-plane.

The next step is to plan the network capacity. Assuming that each server in the node uses one wavelength bandwidth, the number of servers in each node N = Z × ( X + Y -2)

The number of servers per node in the 5×5 network N = 2×8=16

The total number of servers in the network = X × Y × N = 5 × 5 × 16 = 400

The number of servers per node in the 7×7 network N = 3×12=36

Total number of servers on the network = 7×7×36=1764

The number of servers above is the maximum number of servers that each node or the entire network can accommodate.

In a loop topology optical tunnel switching network with 25 nodes and two planes, there are 16 servers (250xy1~250xy16), 2 MUXs (220xy1,220xy2), and 2 nodes 200xy at any coordinate (x, y) CDMUX (230xy1,230xy2), an SDN switch 240xy and 2 WSS (210xy1,210xy2). The first plane of this network is shown in Figure 4. The X-axis and Y-axis wavelength distribution of each node is shown in Figure 3. A total of 40 wavelengths are shared, and different planes can be reused.

Suppose the node N _1,5 to build a tunnel to the node N _4,5, as two nodes in the same X-axis loop, so that by λ ₃ may be established through a tunnel, as shown in FIG. 4. To build a tunnel from node N _{1,5 to node N 5,3} , a relay station transfer tunnel must be established, that is, first use λ _{4 to} establish a horizontal tunnel to node N _{5,5 and} then transmit to SDN switch 24055 with λ ₃₈ The vertical tunnel is switched to node N _5,3 , as shown in Figure 4. Since there is originally a through tunnel between node N _1,5 and node N _5,5 , the horizontal part of the transfer tunnel with the previous relay station will be shared. That is, the traffic of the two will be integrated, so the average traffic of each tunnel cannot exceed 50%. Of course, the SDN switch 24055 at node N _5,5 must distribute the traffic of the two nodes to the correct servers of the two nodes according to different IP addresses, that is, leave the traffic _{to node N 5,5.} And the traffic destined to node N _5,3 is forwarded out through the SDN switch 24055.

However, if each through tunnel node is responsible for transferring a relay station to the tunnel node, there are 8 nodes that cannot receive the traffic of _{node N 1,5.} Therefore, if each through tunnel node is responsible for transferring two relay stations to the tunnel node, node N _1,5 can transmit traffic to any other 24 nodes. However, three nodes sharing a through tunnel will make the average traffic volume of each node reach about 33%, so a plane must be added to increase traffic volume. If a two-plane loop topology is used for the optical tunnel switching network, each plane is responsible for a relay station to transfer the tunnel node, as shown in Figure 5. Figure 5 shows how to connect each other node _{from node N 1,5 with a tunnel.} The larger ellipse indicates the node connected by the relay station transfer tunnel using the X-axis through tunnel. For example, node N _1,5 has a through tunnel connected to node N _5,5 in each plane, and each plane also has its own through tunnel. There is a relay station transfer tunnel connecting nodes N _5,4 and N _{5,3 through relay station nodes N 5,5} , respectively. The smaller ellipse indicates the node connected by the relay station transfer tunnel that uses the Y-axis through tunnel. For example, node N _1,5 has a through tunnel connected to node N _1,4 in each plane, and each plane also has its own through tunnel. A relay station transfer tunnel connects nodes N _2,4 and N _{4,4 through relay station nodes N 1,4} , respectively. So on and so forth. The SDN controller 300 can send control signals to each WSS of each plane to set up the through tunnel and the relay station transfer tunnel as shown in FIG. 5.

This is equivalent to two direct tunnels to three nodes, so the traffic volume of each node can reach about 66% on average. A node 200xy has a total of 16 wavelength bandwidths in the dual plane. Assuming that any server 250xys uses one wavelength bandwidth, a node 200xy has a total of 16 servers (250xy1~250xy16). If the traffic of these servers is distributed evenly to the other 24 nodes, the average traffic volume is only about 66%. Therefore, the two-plane loop topology optical tunnel switching network is sufficient to provide 100% of the average traffic of the server. Of course, if the traffic is not uniformly distributed, the distribution of the tunnel must be adjusted.

In a loop topology optical tunnel switching network with 49 nodes and three planes, any node 200xy consists of 36 servers (250xy1~250xy36), 3 MUXs (220xy1~220xy3), 3 CDMUXs (230xy1~230xy3), An SDN switch 240xy and 3 WSS (210xy1~210xy3) are composed. The first plane of this network is shown in Figure 6. Therefore, the node N _1,7 and the node N _6,7 can establish a through tunnel, and the node N _1,7 and the node N _7,2 need to establish a relay station transfer tunnel through the node N _7,7. The same node N _1,3 and node N _7,3 can establish a through tunnel, and node N _1,3 and node N _6,1 need to establish a relay station transfer tunnel through node N _6,3. Other nodes can also establish direct tunnels and relay station transfer tunnels in sequence.

In a loop topology optical tunnel switching network with 49 nodes, any node N _{x, y} can use 12 wavelengths to establish 6 through tunnels on each of its X-axis loop and Y-axis loop, and in addition to the network There are 36 relay station transfer tunnels to be established for other nodes. If each through tunnel node is responsible for transferring three relay stations to the tunnel node, then nodes N _1,7 can transmit traffic to any other 48 nodes. Similarly, if each plane is responsible for transferring a relay station transfer tunnel, as shown in Figure 7. Figure 7 shows how to connect each other node _{from node N 1,7 with a tunnel.} The larger ellipse indicates the node connected by the relay station transfer tunnel using the X-axis through tunnel. For example, node N _1,7 has a through tunnel connecting node N _7,7 in each plane, and each plane also has its own through tunnel. There is a relay station transfer tunnel connecting nodes N _7,6 , N _7,5 and N _{7,4 through relay station nodes N 7,7} respectively. The smaller ellipse indicates the node connected to the relay station transfer tunnel using the Y-axis through tunnel. For example, node N _1,7 has a through tunnel connected to node N _1,6 in each plane, and each plane also has its own through tunnel. A relay station transfer tunnel connects nodes N _2,6 , N _4,6 and N _{6,6 through relay station nodes N 1,6} , respectively. So on and so forth. The SDN controller 300 can send control signals to each WSS of each plane to set up the through tunnel and the relay station transfer tunnel as shown in FIG. 7.

This is equivalent to three through tunnels responsible for 4 nodes, so the average traffic volume of each node is 75%. A node 200xy has a total of 36 wavelength bandwidths under the three planes. Assuming that any server 250xys uses one wavelength bandwidth, a node 200xy has a total of 36 servers (250xy1~250xy36). If the traffic of these servers is sent to the other 48 nodes on the network on average, the average traffic volume is only 75%. Therefore, the three-plane loop topology optical tunnel switching network is sufficient to provide 100% of the average traffic of the server.

The optical tunnel switching network system of the present invention has the following characteristics and effects.

(1) Network scalability: The use of 49-node three-plane loop topology optical tunnel switching network can greatly increase the traffic of the optical tunnel switching network. This architecture uses 84 wavelengths to provide 1764 (49×36) servers to establish 2352 (49×48) tunnels. The 25-node dual-plane loop topology optical tunnel switching network uses 40 wavelengths to provide 400 (25×16) servers to establish 600 (25×24) tunnels. Therefore, although the number of wavelengths is only doubled, the number of servers it provides can be increased to more than four times. If the number of DWDM wavelengths can be further increased in the future, the number of servers provided can be greatly increased.

(2) Network availability: Multi-plane loop topology optical tunnel switching network connects each node with vertical and horizontal loops, and multi-planes increase network capacity and fault tolerance. When the traffic flow changes, the number of network tunnels can be dispatched in time to balance the load flow and avoid traffic loss.

(3) Network practicability: The currently widely used MEMS and LCoS technologies have millisecond-level switching speeds, which makes the frame of the optical frame switch technology very large, which will affect the performance of the optical frame switch. However, if it is actually implemented in a multi-plane loop optical tunnel switching network, this problem will not be encountered at all. All nodes in the optical tunnel switching network use WSS switching modules. The communication between nodes uses multiple wavelengths to establish a tunnel, and the wavelengths can be reused. Because the wavelength is used to establish the tunnel, it not only simplifies the complexity of the network, but also reduces the delay time of the network.

The above-mentioned embodiments only exemplarily illustrate the principles and effects of the present invention, and are not intended to limit the present invention. Anyone who is familiar with this technique can modify and change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the rights of the present invention should be listed in the scope of patent application described later.

100: Optical tunnel switching network system

200xy, N _x,y : the node of the optical tunnel switching network system, xy represents the node coordinates (x,y)

Claims (10)

An optical tunnel switching network system, including a plurality of nodes and a plurality of planes defined, wherein each node includes a software-defined network switch, a plurality of wavelength selective switches, a plurality of multiplexers, and a plurality of cyclic demultiplexers , And a plurality of servers, and each of the planes corresponds to one of the wavelength selection switches, one of the multiplexers, and one of the cyclic demultiplexers at each of the nodes, and the plurality of planes The multiple wavelength selective switches on the same plane use a two-dimensional loop topology to form multiple horizontal loops and multiple vertical loops. The software-defined network switch of each node connects the multiple multiplexers of each node. Machine, the plurality of cyclic demultiplexers, and the plurality of servers, and each of the wavelength selective switches connects the multiplexer and the cyclic demultiplexer of the same node and the same plane, and The plurality of nodes are used for intercommunication signals of a plurality of optical tunnels formed with a plurality of wavelengths. The optical tunnel switching network system described in item 1 of the scope of patent application, wherein, in each node: The software-defined network switch is used to convert the signals sent by the plurality of servers to other nodes into a plurality of first optical signals of different wavelengths, and transmit the plurality of first optical signals of different wavelengths to the plurality of Machine The plurality of multiplexers are configured to couple the plurality of first optical signals of different wavelengths into a first high-density wavelength division signal, and transmit the first high-density wavelength division signal to the plurality of wavelength selective switches; The plurality of wavelength selective switches are used to transmit the first high-density wavelength division signal to the wavelength selective switches of other nodes through the plurality of optical tunnels; The plurality of wavelength selective switches are also used to transmit the second high-density wavelength division signal transmitted from the wavelength selective switch of the other node to the node to the plurality of cyclic demultiplexers; The plurality of cyclic demultiplexers are used to separate out the plurality of second optical signals of different wavelengths in the second high-density wavelength division signal, and transmit the plurality of second optical signals of different wavelengths to the software Define the network switch; and The software-defined network switch is further used for converting the plurality of second optical signals of different wavelengths into electronic signals, and transmitting the electronic signals to the plurality of servers. The optical tunnel switching network system described in item 2 of the scope of patent application further includes: The software-defined network controller is connected to each of the software-defined network switches and each of the wavelength selective switches, and is used to set the wavelength of each of the first optical signals and the wavelength of each of the optical tunnels. For example, the optical tunnel switching network system described in item 1 of the scope of patent application, wherein the plurality of optical tunnels includes a plurality of through tunnels and a plurality of relay station transfer tunnels, and each of the through tunnels directly connects two through tunnels without passing through a relay station node. The node and each relay station transfer tunnel connects two nodes through another node as a relay station node. The optical tunnel switching network system described in item 4 of the scope of patent application, wherein the plurality of nodes include a first node and a second node, and the second node is another node of the first node in the first direction , The first node has a through tunnel in each plane to connect to the second node, and in each plane, there is a relay station transfer tunnel, and the second node is used as a relay station node to connect to the second node. The node is a plurality of other nodes in a second direction, wherein the first direction is one of the horizontal and the vertical, and the second direction is the other of the horizontal and the vertical. The optical tunnel switching network system described in item 5 of the scope of patent application further includes: A software-defined network controller is connected to each of the wavelength selection switches, and is used to set the plurality of through tunnels and the plurality of relay station transfer tunnels of the first node. For example, the optical tunnel switching network system described in item 4 of the scope of patent application, wherein each of the horizontal loops is connected to X of the nodes, each two of the nodes in each of the horizontal loops communicate with a different wavelength, and each A vertical loop connects Y of the nodes, each two of the nodes in each vertical loop communicate with a different wavelength, the number of the plurality of nodes in the optical tunnel switching network is X × Y , and the optical tunnel switching The total number of wavelengths used in the network is W , where W = X × ( X -1) + Y × ( Y -1), and X , Y , and W are all positive integers. For the optical tunnel switching network system described in item 7 of the scope of patent application, the number of the through tunnels from each node to other nodes is D , where D = ( X -1) + ( Y -1 ), the number of transfer tunnels of the relay station from each node to other nodes is R , where R = X × Y -1- D. For example, the optical tunnel switching network system described in item 8 of the scope of patent application, wherein the number of the plurality of planes of the optical tunnel switching network is Z , where Z = ceil ( R / D ), ceil is the decimal Unconditional carry function. For the optical tunnel switching network system described in item 9 of the scope of patent application, the maximum number of the plurality of servers in each node is N , where N = Z × ( X + Y -2).

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