Optical switching node and control method, device, system, equipment and medium thereof

Abstract

The invention discloses an optical switching node and a control method, device, system, equipment and medium thereof, and belongs to the technical field of optical communication. The optical switching node comprises N line side switching units and a local switching unit, and N is a positive integer and is greater than 1; each line side switching unit comprises X optical switches, X is a positive integer, each optical switch in the X optical switches comprises a plurality of first ports and a second port, and the second port is selectively communicated with one first port in the plurality of first ports; and one first port of each optical switch is connected with the local switching unit. The signal transmission performance of the line side switching unit of the optical switching node is good.

Description

Technical Field

[0001] This application relates to the field of optical communication technology, and in particular to an optical switching node and its control method, apparatus, system, equipment and medium. Background Technology

[0002] Optical switching nodes are an important component of optical networks. An optical network typically includes multiple optical switching nodes, which can be networked in any manner.

[0003] In related technologies, optical switching nodes include local switching units and multiple line-side switching units. Both local switching units and line-side switching units are implemented using wavelength-selective switches (WSS).

[0004] However, WSS has high insertion loss, low isolation, and filtering effects, which affect the signal transmission performance of optical switching nodes. Summary of the Invention

[0005] This application provides an optical switching node and its control method, apparatus, system, equipment, and medium, which are beneficial to improving the signal transmission performance of the optical switching node.

[0006] In a first aspect, this application provides an optical switching node comprising N line-side switching units and a local switching unit, where N is a positive integer and greater than 1. Each line-side switching unit includes X optical switches (OSWs), where X is a positive integer, meaning each line-side switching unit may include one or more optical switches. Each optical switch includes multiple first ports and at least one second port. Any one of the at least one second port is selectively connected to any one of the multiple first ports of the optical switch; that is, any second port of each optical switch is only connected to one first port of the optical switch at any given time, and optical signals can only pass through the connected first and second ports. Any first port of each optical switch is connected to a scheduling port of the local switching unit.

[0007] In this application, the line-side switching unit includes an optical switch, which controls the switching of optical signals between the local switching unit and other optical switching nodes. Compared with WSS, the optical switch has lower insertion loss, higher isolation, and no filtering effect, which is beneficial to improving the signal transmission performance of the optical switching node. In addition, the optical switch has higher integration and smaller size, which is beneficial to the miniaturization of the optical switching node.

[0008] In some examples, each line-side switching unit includes one optical switch, i.e., X equals 1. In other examples, each line-side switching unit includes multiple optical switches, i.e., X is greater than 1, and at least two of the multiple optical switches have at least two second ports connected to the same optical fiber. The number of optical switches in each line-side switching unit can be set according to actual needs.

[0009] For example, each line-side switching unit includes two optical switches, namely a first optical switch and a second optical switch. The second port of the first optical switch and the second port of the second optical switch are connected to the same optical fiber.

[0010] In one possible implementation, the first optical switch and the second optical switch are used to transmit optical signals of different wavelengths. By using two optical switches to transmit optical signals of different wavelengths, the transmission capacity of the optical communication system can be increased.

[0011] In another possible implementation, the first optical switch and the second optical switch are used to transmit optical signals in the same wavelength band. In this implementation, the first optical switch can be used as the primary optical switch, and the second optical switch as a backup optical switch. In the event of a failure of the primary optical switch, the backup optical switch operates to control the optical signal transmission, thereby improving the reliability of the optical communication system.

[0012] Alternatively, the local switching unit can be structured in any of the following ways.

[0013] The first type involves a local switching unit comprising multiple switching sub-units, each corresponding to a local dimension. Each switching sub-unit is connected to each optical switch in the line-side switching unit. When a switching sub-unit in a certain local dimension fails, it will not affect the switching sub-units in other dimensions, resulting in high reliability of the optical switching node.

[0014] Optionally, each switching subunit includes at least one switching component. Each switching component is connected to an optical switch in each line-side switching unit.

[0015] In some examples, the number of switching components included in a switching subunit is equal to the number of optical switches included in a line-side switching unit. For example, when a line-side switching unit includes one optical switch, the switching subunit includes one switching component. As another example, when a line-side switching unit includes two optical switches, the switching subunit includes two switching components. In this case, for each line-side switching unit, each switching component is connected to only one optical switch.

[0016] In other examples, the number of switching components contained in a switching subunit is less than the number of optical switches contained in a line-side switching unit. For example, a line-side switching unit includes two optical switches, while a switching subunit includes one switching component. In this case, for each line-side switching unit, each switching component is connected to multiple optical switches therein. Thus, optical switches connected to the same switching component can be in a primary / backup configuration to further improve the reliability of the optical switching node.

[0017] Each switching component can transmit any received local wavelength to any connected optical switch to enable the local wavelength; and / or de-encode any wavelength from the optical signal received from any connected optical switch. Here, wavelength refers to a single-wavelength optical signal.

[0018] Alternatively, the switching component can adopt either Structure A or Structure B.

[0019] Structure A: Each switching component includes a first multiplexer and a first WSS.

[0020] The first multiplexer includes multiple wavelength division multiplexing (WDM) ports and one multiplexing port. Each WDM port receives a single-wavelength optical signal; the multiplexing port outputs a combined optical signal composed of the single-wavelength optical signals received by the multiple WDM ports. The first WSS has a common port and multiple branch ports. The common port is connected to the multiplexing port, and each branch port is connected to an optical switch in each line-side switching unit. That is, each branch port is connected to a first port of an optical switch in a line-side switching unit.

[0021] For example, the first WSS is a 1×N WSS.

[0022] In this structure A, each device in the switching component is easy to implement and has a low cost.

[0023] Structure B: Each switching component includes a second WSS.

[0024] The second WSS includes multiple third ports and multiple fourth ports. Each third port is used to receive a single-wavelength optical signal, and each of the multiple fourth ports is connected to an optical switch in each line-side switching unit. That is, each fourth port is connected to a first port of an optical switch in a line-side switching unit.

[0025] In this structure B, each switching component includes a WSS, which is simple in structure.

[0026] The second type involves a local switching unit comprising a first switching subunit, which corresponds to multiple local dimensions. The first switching subunit is connected to each optical switch in the line-side switching unit. That is, optical signals from multiple local dimensions are routed to the required line-side switching unit via this first switching subunit. By connecting to each line-side switching unit through a single switching subunit, the local switching unit achieves high integration, thereby simplifying the structure of the optical switching node.

[0027] The structure of the first exchange subunit can be either structure C or structure D.

[0028] Structure C, the first switching subunit includes a third WSS and M second combiners.

[0029] Each second multiplexer includes multiple wavelength division ports and one multiplexer port. The multiple wavelength division ports are used to receive single-wavelength optical signals. The third WSS has multiple fifth ports and multiple sixth ports. Each fifth port is connected to the multiplexer port of a second multiplexer. The multiple sixth ports are respectively connected to an optical switch in each of the line-side switching units.

[0030] For example, the third WSS is an N×N WSS.

[0031] In this structure C, each third multiplexer corresponds to a local dimension. Typically, a local dimension contains multiple single-wavelength optical signals. By first multiplexing these signals using the third multiplexer, and then transmitting them to the third WSS, the number of fifth ports on the third WSS can be reduced, thus simplifying the implementation of the WSS.

[0032] Structure D, the first switching subunit includes the fourth WSS.

[0033] The fourth WSS has multiple seventh ports and multiple eighth ports. The seventh ports are used to receive single-wavelength optical signals, and the multiple eighth ports are connected to an optical switch in each of the line-side switching units.

[0034] For example, the fourth WSS is an N×N WSS.

[0035] In this structure D, the multiple seventh ports of the fourth WSS can be divided into multiple port groups, each port group corresponding to a local dimension. The first switching subunit includes only one WSS, with a small number of devices and high integration.

[0036] Optionally, in this second embodiment, the local switching unit further includes a second switching subunit. This second switching subunit corresponds to multiple local dimensions. The second switching subunit is connected to each optical switch in the line-side switching unit. Exemplarily, the structure of the second switching subunit is the same as that of the first switching subunit, and the second switching subunit can serve as a backup switching subunit for the first switching subunit to improve the reliability of the optical switching node.

[0037] Optionally, the first port of the third optical switch in the first line-side switching unit is connected to the first port of the fourth optical switch in the second line-side switching unit. The first and second line-side switching units are any two of the aforementioned N line-side switching units, and the optical signals transmitted by the third and fourth optical switches belong to the same wavelength band. Thus, when needed, the line-side optical signal received at the second port of the third optical switch can be directly transmitted to the fourth optical switch, enabling the line-side optical signal to be transmitted between the two line-side switching units.

[0038] Secondly, this application provides an optical communication system comprising multiple optical switching nodes, each optical switching node being connected to at least one other optical switching node. The optical switching nodes are any of the types of optical switching nodes provided in the first aspect.

[0039] Thirdly, this application provides a control method for an optical switching node, which can be used to control the optical switching node in the first aspect. The method includes: controlling a local switching unit to redirect a first optical signal in a first optical fiber connected to a first line-side switching unit to a second optical fiber connected to a second line-side switching unit, wherein the first line-side switching unit and the second line-side switching unit are any two line-side switching units from the N line-side switching units.

[0040] For example, the method can be executed when the first optical fiber fails (e.g., breaks), or when another optical signal with the same wavelength as the first optical signal needs to be scheduled into the first optical fiber, or after the second optical fiber fault is recovered.

[0041] Optionally, the local switching unit has a first scheduling port connected to the first line-side switching unit and a second scheduling port connected to the second line-side unit, and the first scheduling port and the second scheduling port correspond to a local dimension. The method further includes: controlling the second port of the target optical switch in the second line-side switching unit to be connected to the target port, where the target port is the first port connected to the second scheduling port. If the second port of the target optical switch in the second line-side switching unit is not connected to the target port, controlling the local switching unit alone cannot schedule the first optical signal in the first optical fiber connected to the first line-side switching unit to the second optical fiber connected to the second line-side switching unit. Therefore, in this case, it is also necessary to connect the second port of the target optical switch to the target port.

[0042] In a first possible implementation, the first line-side switching unit and the second line-side switching unit belong to different line dimensions, that is, they are connected to different optical switching nodes.

[0043] In a second possible implementation, the first line-side switching unit and the second line-side switching unit belong to the same line dimension, i.e., they are connected to the same optical switching node. In this case, the first scheduling port and the second scheduling port correspond to a plane in a local dimension.

[0044] In this second possible implementation, the method may further include routing the second optical signal in the second optical fiber connected to the second line-side switching unit to the third optical fiber connected to the third line-side switching unit. The second optical signal and the first optical signal belong to the same wavelength band and correspond to different planes in the local dimension. Here, the third line-side switching unit, the first line-side switching unit, and the second line-side switching unit all belong to the same line dimension and are all connected to the target optical switching node.

[0045] Fourthly, this application provides a control device for an optical switching node. This control device for the optical switching node has the function of implementing the method described in the second aspect or any of the optional embodiments of the second aspect. The function can be implemented in hardware or by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-described functions.

[0046] Fifthly, a computer device is provided. The computer device includes a processor and a memory. The memory is used to store software programs and modules. The processor implements the methods described in the third aspect or any possible implementation thereof by running or executing the software programs and / or modules stored in the memory.

[0047] Optionally, the processor may be one or more, and the memory may be one or more.

[0048] Optionally, the memory may be integrated with the processor, or the memory may be separated from the processor.

[0049] In the specific implementation process, the memory can be a non-transitory memory, such as read-only memory (ROM), which can be integrated with the processor on the same chip or set on different chips. This application does not limit the type of memory or the way the memory and processor are set.

[0050] Sixthly, a computer program product is provided. The computer program product includes computer program code that, when executed by a computer, causes the computer to perform the methods described in the third aspect or any possible implementation thereof.

[0051] In a seventh aspect, this application provides a computer-readable storage medium for storing program code executed by a processor, the program code including methods for implementing the third aspect or any possible implementation thereof.

[0052] Eighthly, this application provides a chip including a processor, the processor being configured to retrieve and execute instructions stored in a memory, causing a computer device on which the chip is mounted to perform the methods described in the third aspect or any possible implementation thereof.

[0053] Ninthly, this application provides another chip. This other chip includes an input interface, an output interface, a processor, and a memory. The input interface, output interface, processor, and memory are interconnected via internal connection paths. The processor is used to execute code in the memory, and when the code is executed, the processor is used to perform the method described in the third aspect or any possible implementation thereof.

[0054] Figure 1 This is a schematic diagram of the structure of an optical communication system provided in an embodiment of this application;

[0055] Figure 2 This is a schematic diagram of the structure of an optical switching node provided in an embodiment of this application;

[0056] Figure 3 This is a schematic diagram illustrating the structure and operating principle of an optical switch;

[0057] Figure 4 This is a schematic diagram of another optical switching node provided in an embodiment of this application;

[0058] Figure 5 This is a schematic diagram of the structure of another optical switching node provided in an embodiment of this application;

[0059] Figure 6 This is a schematic diagram of the structure of another optical switching node provided in an embodiment of this application;

[0060] Figure 7 This is a schematic diagram of the structure of another optical switching node provided in an embodiment of this application;

[0061] Figure 8 This is a schematic diagram of the structure of another optical switching node provided in an embodiment of this application;

[0062] Figure 9 This is a schematic diagram of the structure of another optical switching node provided in an embodiment of this application;

[0063] Figure 10 This is a flowchart illustrating a control method for an optical switching node provided in an embodiment of this application;

[0064] Figure 11 This is a schematic diagram of a control device for an optical switching node provided in an embodiment of this application;

[0065] Figure 12 This is a schematic diagram of the structure of a computer device provided in an embodiment of this application. Detailed Implementation

[0066] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0067] Figure 1 This is a schematic diagram of the structure of an optical communication system provided in an embodiment of this application. For example... Figure 1 As shown, the optical communication system includes multiple optical switching nodes 1, each of which is connected to at least one other optical switching node 1.

[0068] For example, Figure 1 In this embodiment, any two optical switching nodes 1 are connected via optical fiber links. That is, multiple optical switching nodes 1 are networked in a mesh topology, also known as a fully interconnected network. In other embodiments, multiple optical switching nodes can be networked in other forms, such as chain topology or star topology, and this application does not limit this.

[0069] This optical communication system can be used in scenarios such as data center interconnect (DCI) and optical transport network (OTN).

[0070] For example, optical switching node 1 can spatially transform the optical signal, enabling it to be output from different directions (or dimensions). Optical switching node 1 can be a reconfigurable optical add-drop multiplexer (ROADM), etc.

[0071] Figure 1 The example shown is an optical communication system with four optical switching nodes (nodes A, B, C, and D), but this is not a limitation. The number of optical switching nodes in an optical communication system can be adjusted according to the actual scale of the optical network.

[0072] Figure 2 This is a schematic diagram of the structure of an optical switching node provided in an embodiment of this application. Figure 2 As shown, the optical switching node includes N line-side switching units 10 and local switching units 20. N is a positive integer and greater than 1. Each line-side switching unit 10 includes X optical switches, where X is a positive integer. That is, each line-side switching unit 10 may include one or more optical switches. For example, Figure 2 In this configuration, each line-side switching unit 10 includes two optical switches, namely a first optical switch 11 and a second optical switch 12. Any first port of each optical switch is connected to a scheduling port of the local switching unit. The second optical switch 12 and the connection between the second optical switch 12 and the local switching unit 20 are depicted using dashed lines. Alternatively, each line-side switching unit 10 may include only the first optical switch 11 and exclude the second optical switch 12.

[0073] In this embodiment, the local switching unit can send local optical signals to any connected optical switch, thereby uplinking the local optical signals; and / or receive line-side optical signals sent by any optical switch, thereby delinking the line-side optical signals. The local switching unit 20 includes multiple uplink / downlink ports and multiple scheduling ports, wherein the uplink / downlink ports are used to connect to an optical transform unit (OTU), and each scheduling port is used to connect to a first port. The scheduling port and the corresponding first port are connected via an optical transmission medium (e.g., optical fiber).

[0074] Figure 3 This is a schematic diagram illustrating the structure and working principle of an optical switch. Figure 3As shown, the optical switch includes multiple first ports 11a and at least one second port 11b (illustrated as an example with one second port 11b), and the second port 11b is selectively connected to one of the multiple first ports 11a. That is, for each optical switch, an optical signal can only pass between the connected first port 11a and the second port 11b. For example, Figure 3 In the diagram, the connection between the first port 11a and the second port 11b is a solid black line, indicating that they are connected and the optical signal can be transmitted along the path corresponding to this solid line. Conversely, the connections between other first ports 11a and second ports 11b are dashed lines, indicating that they are not connected and the optical signal cannot be transmitted along the path corresponding to this dashed line. It should be noted that... Figure 3 For illustrative purposes only, the embodiments of this application do not limit the internal structure of the optical switch.

[0075] In this embodiment, the line-side switching unit includes an optical switch, which controls the switching of optical signals between the local switching unit and other optical switching nodes. When the line-side switching unit uses a WSS (Wireless Switch System), the insertion loss of the WSS is relatively high, typically above 6dB, while the insertion loss of the optical switch is relatively low, typically 1dB-2dB. Therefore, the optical power loss after the optical signal passes through the optical switch is smaller, which is beneficial for long-distance transmission of the optical signal. Furthermore, the isolation of the WSS is typically around 25dB, while the isolation of the optical switch is generally above 40dB. Higher isolation is beneficial for improving the signal-to-noise ratio of the optical signal. Finally, the WSS requires dispersion of the optical signal to obtain a single-wavelength optical signal, and then the direction of the single-wavelength optical signal is adjusted. This process involves filtering effects, which can cause signal degradation; while the optical switch does not have a filtering effect, thus improving the transmission quality of the optical signal. It can be seen that compared with the WSS, the optical switch has lower insertion loss, higher isolation, and no filtering effect, which is beneficial for improving the signal transmission performance of the optical switching node. In addition, optical switches have higher integration and smaller size, which is beneficial for the miniaturization of optical switching nodes.

[0076] Alternatively, the optical switch can be a mechanical optical switch, a micro-electro-mechanical system (MEMS) optical switch, a magneto-optical optical switch, a thermo-optical optical switch, or a liquid crystal optical switch, etc.

[0077] For example, such as Figure 2As shown, each line-side switching unit 10 includes two optical switches, namely a first optical switch 11 and a second optical switch 12. Both the first optical switch 11 and the second optical switch 12 have a first port connected to the local switching unit 20. The second ports of the first optical switch 11 and the second optical switch 12 are connected to the same optical fiber a. During transmission, other optical devices can be installed between the second ports of the first optical switch 11 and the second optical switch 12 and the optical fiber a. For example, the second ports of the first optical switch 11 and the second optical switch 12 can be connected to the wavelength division port of a coupler, and the wavelength multiplexing port of the coupler is connected to the optical fiber. Furthermore, devices such as optical amplifiers can also be connected between the second ports of the first optical switch 11 and the second optical switch 12 and the wavelength division port of the coupler. This application embodiment does not limit the connection method between the second ports of the first optical switch 11 and the second optical switch 12 and the optical fiber a, as long as the optical signals transmitted by the first optical switch 11 and the second optical switch 12 can be transmitted in the same optical fiber a.

[0078] In one possible implementation, the first optical switch 11 and the second optical switch 12 are used to transmit optical signals in different wavelength bands. For example, the first optical switch 11 is used to transmit conventional (C) band optical signals, and the second optical switch 12 is used to transmit long-wavelength (L) band optical signals. As another example, the first optical switch 11 is used to transmit C-band optical signals, and the second optical switch 12 is used to transmit short-wavelength (S) band optical signals. By using two optical switches to transmit optical signals in different wavelength bands, the transmission capacity of the optical communication system can be increased.

[0079] In another possible implementation, the first optical switch 11 and the second optical switch 12 are used to transmit optical signals in the same wavelength band. For example, both the first optical switch 11 and the second optical switch 12 are used for C-band, L-band, or S-band optical signals. In practice, the first optical switch 11 can be used as the primary optical switch, and the second optical switch 12 as a backup optical switch. In the event of a failure of the primary optical switch, the backup optical switch operates to control the optical signal transmission, thereby improving the reliability of the optical switching node.

[0080] In other embodiments, each line-side switching unit 10 may also include a greater number of optical switches, such as three or four. The number of optical switches in the line-side switching unit 10 can be set according to actual needs.

[0081] Optionally, the first port of the third optical switch in the first line-side switching unit is connected to the first port of the fourth optical switch in the second line-side switching unit. The first line-side switching unit and the second line-side switching unit are any two of the N line-side switching units, and the optical signals transmitted by the third optical switch and the optical signals transmitted by the fourth optical switch belong to the same wavelength band.

[0082] In one possible implementation, each line-side switching unit corresponds to one dimension, and each line-side switching unit is connected to an optical switching node in the corresponding dimension via an optical fiber link. For example... Figures 4 to 8 The illustrated embodiment.

[0083] In another possible implementation, multiple line-side switching units correspond to the same dimension, and each of these multiple line-side switching units corresponding to the same dimension is connected to an optical switching node via an optical fiber link. For example... Figure 9 The illustrated embodiment.

[0084] In the embodiments of this application, the optical fiber link includes at least optical fiber, and may also include some optical devices, such as optical connectors, optical amplifiers, etc.

[0085] Figure 4 This is a schematic diagram of another optical switching node provided in an embodiment of this application. For example... Figure 4 As shown, the optical switching node includes N line-side switching units 10 and local switching units 20. Here, N is a positive integer and N is greater than 1. Figure 4 The example given uses N=4, and the number of line-side switching units 10 can be set according to actual needs. Each line-side switching unit 10 includes an optical switch, namely a first optical switch 11. A first port of each first optical switch 11 is connected to a scheduling port of the local switching unit 20. For details regarding optical switches, please refer to [link to relevant documentation]. Figure 3 The relevant content will not be described in detail here.

[0086] Optionally, Figure 4 In this configuration, any two first optical switches 11 are connected through their respective first ports. Thus, when the second port of one first optical switch 11 receives a line-side optical signal sent by an optical switching node in the corresponding dimension, it can send the line-side optical signal to another first optical switch 11, thereby sending the line-side optical signal through the other first optical switch 11 to an optical switching node in another dimension, achieving optical signal pass-through.

[0087] Optionally, the local switching unit 20 includes M switching sub-units 21. The figure illustrates this with M equal to 4, and the number of switching sub-units 21 can be set according to actual needs. Each switching sub-unit 21 corresponds to a local dimension; that is, in this embodiment, there are M local dimensions. When a switching sub-unit in a certain local dimension fails, it will not affect the switching sub-units in other dimensions, resulting in high reliability of the optical switching node.

[0088] For example, a local dimension typically has multiple wavelengths of single-wavelength optical signals, such as 80 wavelengths, 96 wavelengths, or 120 wavelengths.

[0089] In some examples, M is less than N. In one possible application scenario, M of the N line-side switching units 10 can be used as primary line-side switching units, and the remaining line-side switching units 10 can be used as backup line-side switching units. Under normal circumstances, the primary line-side switching units are active, while the backup line-side switching units are inactive. When a primary line-side switching unit fails, the optical signal from the failed primary line-side switching unit is switched to the backup line-side switching unit for transmission. In this way, N:M protection can be provided for the optical signal in each local dimension. In this application scenario, the M line-side switching units correspond to different dimensions and are connected to another optical switching node in the corresponding dimension.

[0090] Each switching subunit 21 includes at least one switching component. Each switching component is connected to an optical switch in each line-side switching unit. Each switching component is used to transmit local optical signals to any of the connected optical switches and / or to offload line-side optical signals transmitted by any of the connected optical switches.

[0091] Here, the local optical signal is typically a single-wavelength optical signal. The switching component can output one or more locally connected single-wavelength optical signals from a scheduling port to the corresponding optical switch to achieve local optical signal uplinking. The line-side optical signal can be a single-wavelength optical signal or a multi-wavelength optical signal (including multiple single-wavelength optical signals). The switching component can output any single-wavelength optical signal received from the line-side optical signal from the optical switch from the corresponding uplink / downlink port to achieve line-side optical signal downlinking.

[0092] For example, Figure 4In this configuration, each switching subunit 21 includes a switching component. Each switching component includes a first multiplexer 211 and a first WSS 212. The first multiplexer 211 includes multiple wavelength division ports and one multiplexing port. Here, the wavelength division ports are the aforementioned add / drop ports, used to receive single-wavelength optical signals, and the multiplexing port is used to output a multiplexed optical signal composed of the single-wavelength optical signals received by the multiple wavelength division ports. The first WSS 212 has a common port and multiple branch ports. The common port is connected to the multiplexing port of the first WSS 212, and the multiple branch ports are respectively connected to a first optical switch 11 in each line-side switching unit 10. Here, the branch ports are the aforementioned scheduling ports. For example, Figure 4 In the first WSS212, there are at least N branch ports, each branch port is connected to a first port of a first optical switch 11, and the first ports connected to different branch ports belong to different first optical switches 11.

[0093] Optionally, the first combiner 211 can be a 1×N WSS, an arrayed waveguide grating (AWG), or a thin film filter (TFF), etc.

[0094] Optionally, the first WSS212 is a 1×N WSS.

[0095] It should be noted that this embodiment is illustrated using the transmitting side as an example; the structure of the receiving side is similar.

[0096] In this embodiment, a combination of the first multiplexer 211 and the first WSS 212 is used to schedule a single-wavelength optical signal in a local dimension. Each device in the switching component is easy to implement and has a low cost, so the cost of a single switching component is also low, which helps to reduce the cost of the optical switching node.

[0097] Figure 5 This is a schematic diagram of another optical switching node provided in an embodiment of this application. Figure 3 The difference between the optical switching nodes shown lies in the structure of their switching components. Figure 5 In the illustrated embodiment, each switching component includes a second WSS213, which includes multiple third ports and multiple fourth ports. The multiple third ports are used to receive single-wavelength optical signals, and the multiple fourth ports are respectively connected to a first optical switch 11 in each line-side switching unit 10. For example, Figure 5 In this configuration, the second WSS213 has at least N fourth ports, each branch port being connected to a first port of a first optical switch 11, and the first ports connected to different fourth ports belonging to different first optical switches 11. Here, the third port is the aforementioned add / drop port, and the fourth port is the aforementioned scheduling port.

[0098] Optionally, the second WSS213 can be a WSS with multiple common ports, or an add / drop WSS (ADWSS), or an N×N WSS.

[0099] In this embodiment, each switching component includes a WSS, resulting in a simple structure. Furthermore, by selecting different types of second WSSs, wavelength-independent, direction-independent, contention-independent (CDC) or wavelength-independent, direction-independent (CD) ROADMs can be implemented.

[0100] Since a WSS with multiple common ports can only emit a single-wavelength optical signal received from one branch port from the common port at a time, there is a competition between the single-wavelength optical signals. Therefore, when the second WSS is a WSS with multiple common ports, CD-ROADM can be realized.

[0101] ADWSS is a dedicated WSS for both uplink and downlink operation. The ADWSS has X ports for connecting single-wavelength optical signals and Y ports for connecting to different line-side switching units 10. Multiple cross-connect matrices between the third and fourth ports can be arbitrarily configured, and the single-wavelength optical signals received at the third ports are allowed to have the same wavelength. Therefore, CDC-ROADM can be implemented.

[0102] N×N WSS functions similarly to ADWSS, enabling arbitrary combination and distribution of optical signals of different or the same wavelength, and can also realize CDC-ROADM.

[0103] exist Figure 4 and Figure 5 In the illustrated embodiment, the number of switching components included in the switching subunit 21 is equal to the number of optical switches included in the line-side switching unit 10. The line-side switching unit 10 includes one optical switch, and the switching subunit 21 includes one switching component. In other embodiments, the number of switching components included in the switching subunit 21 may be less than the number of optical switches included in the line-side switching unit 10. For example... Figure 6 The illustrated embodiment.

[0104] Figure 6 This is a schematic diagram of another optical switching node provided in an embodiment of this application. Figure 5 The difference in the illustrated embodiments is that, as Figure 6As shown, each line-side switching unit 10 includes two optical switches, and the local switching unit 20 includes two switching sub-units 21. Each switching sub-unit 21 includes a switching component, and each switching component is connected to each optical switch in each line-side switching unit 10.

[0105] For example, the two optical switches are a first optical switch 11 and a second optical switch 12. Each switching component includes a second WSS 213. For each line-side switching unit 10, the second WSS 213 has two third ports connected to it, one third port connected to a first port of the first optical switch 11 and the other third port connected to a first port of the second optical switch 12.

[0106] In this way, optical switches connected to the same switching component can be in a master-slave relationship to further improve the reliability of optical switching nodes.

[0107] It should be noted that, Figure 6 The optical switching nodes in the middle adopt Figure 5 The structure of the switching component in the example can also be replaced in other embodiments. Figure 4 The structure of the switching components in the document.

[0108] Figure 7 This is a schematic diagram of another optical switching node provided in an embodiment of this application. Figure 4 The difference in the illustrated embodiment is that the structure of the local switching unit 20 is different. Figure 7 One of the switching sub-units in the local switching unit 20 is shared by multiple local dimensions.

[0109] like Figure 7 As shown, the local switching unit 20 includes a first switching subunit 21a. The first switching subunit 21a includes a third WSS 214 and a plurality of second multiplexers 215.

[0110] The third WSS214 has multiple fifth ports and multiple sixth ports, and the multiple sixth ports are respectively connected to the first optical switch 11 in each line-side switching unit 10. That is, each first optical switch 11 has a first port connected to a sixth port of the third WSS214.

[0111] Each second multiplexer 215 includes multiple wavelength division ports and one multiplexing port. The multiple wavelength division ports of the second multiplexer 215 are used to receive single-wavelength optical signals, and the multiplexing port is used to output a multiplexed optical signal composed of the single-wavelength optical signals received by the multiple wavelength division ports. The multiplexing port is connected to a fifth port of the third WSS 214.

[0112] Here, the wavelength division port is the aforementioned up-and-down wavelength port, and the sixth port is the aforementioned scheduling port.

[0113] In this embodiment, each third multiplexer corresponds to a local dimension. Typically, a local dimension contains multiple single-wavelength optical signals. By first multiplexing these signals using the third multiplexer before transmitting them to the third WSS, the number of fifth ports on the third WSS can be reduced, thus simplifying the implementation of the WSS.

[0114] It should be noted that, for illustrative purposes only, Figure 7 Only two second multiplexers 215 are shown in the diagram, while other second multiplexers 215 are not shown.

[0115] For example, the third WSS is an N×N WSS. Here, N is greater than or equal to the larger of the number of local dimensions and the number of line-side switching units.

[0116] Optionally, the local switching unit 20 further includes a second switching subunit 21b, the structure of which is the same as that of the first switching subunit 21a. Since the third WSS 214 in the first switching subunit 21a carries all local-level services, its failure would cause the entire node to fail. Therefore, a second switching subunit 21b can be configured in the local switching unit 20 as a backup subunit for the first switching subunit 21a. When the first switching subunit 21a fails, the second switching subunit 21b operates, thereby improving the reliability of the optical switching node.

[0117] For example, when the first switching subunit 21a fails, the second port of each first optical switch 11 is connected to the first port of the second switching subunit 21b, thereby realizing the switching of the first switching subunit 21a and the second switching subunit 21b.

[0118] Optionally, the first switching subunit 21a and the second switching subunit 21b can be connected to the same OTU, with one port of each OTU connected to the first switching subunit 21a and the second switching subunit 21b respectively via a connection device (e.g., an optical switch or a coupler). Alternatively, the first switching subunit 21a and the second switching subunit 21b can be connected to different OTUs.

[0119] Figure 8 This is a schematic diagram of another optical switching node provided in an embodiment of this application. Figure 7 The difference in the illustrated embodiment lies in the different structures of the first switching subunit 21a and the second switching subunit 21b. For example... Figure 8As shown, both the first switching subunit 21a and the second switching subunit 21b include a fourth WSS 216. The fourth WSS 216 has multiple seventh ports and multiple eighth ports. The multiple seventh ports are used to receive single-wavelength optical signals, and the multiple eighth ports are connected to a first optical switch 11 in each line-side switching unit 10.

[0120] Here, the seventh port is the aforementioned up-and-down port, and the eighth port is the aforementioned scheduling port.

[0121] The seventh port of the fourth WSS216 can be divided into multiple port groups, each port group corresponding to a local dimension. Each eighth port of the fourth WSS216 is associated with a port group, and the associated port group and the eighth port correspond to the same local dimension. The fourth WSS216 is used to send optical signals received from the seventh port of the associated port group to the connected line-side switching unit 10, or to send optical signals received from the connected line-side switching unit 10 to the seventh port of the associated port group.

[0122] For example, the fourth WSS216 is an N×N WSS. Here, N is greater than or equal to the sum of the number of wavelengths in the local dimension corresponding to the fourth WSS216.

[0123] In this embodiment, the first switching subunit includes only one WSS, resulting in a small number of devices and high integration.

[0124] Figure 9 This is a schematic diagram of the structure of another optical switching node provided in an embodiment of this application. For example... Figure 9 As shown, the optical switching node includes four line-side switching units 10 and a local switching unit 20.

[0125] Each line-side switching unit 10 includes two optical switches, namely a first optical switch 11 and a second optical switch 12. The first optical switch 11 and the second optical switch 12 are used to transmit optical signals of different bands. For example, the first optical switch 11 is used to transmit C-band optical signals, and the second optical switch 12 is used to transmit L-band optical signals.

[0126] The second port of the optical switch in the same line-side switching unit 10 is connected to an optical fiber. The four line-side switching units 10 are each connected to four optical fibers. In order to transmit the optical signal output from the second port of the optical switch in the same line-side switching unit 10 through an optical fiber, the second ports of two optical switches can be connected to one end of the optical fiber through a multiplexing module 13 (e.g., a fiber interface unit (FIU)).

[0127] Optionally, in order to ensure that the power of the optical signal is sufficient to be transmitted to another optical switching node, an optical amplifier 14 is also provided between the second port of the optical switch and the multiplexing module 13. The optical signal is first amplified by the optical amplifier 14 before being multiplexed.

[0128] The local switching unit 20 includes a switching subunit 21. Each switching subunit 21 includes two switching components: one switching component is connected to a first optical switch 11 in each line-side switching unit 10, and the other switching component is connected to a second optical switch 12 in each line-side switching unit 10. That is, in this embodiment, the number of switching components in each switching subunit 21 is equal to the number of optical switches in the line-side switching unit 10.

[0129] For example, Figure 9 In this configuration, each switching component includes a second WSS213; that is, one switching sub-unit 21 includes two second WSS213s. One second WSS213 is connected to the first optical switch 11, and the other second WSS213 is connected to the second optical switch 12. The second WSS213 is a WSS with multiple common ports. The second WSS213 includes 40 third ports and 4 fourth ports. Each of the 40 third ports is used to receive a single-wavelength optical signal. The 4 fourth ports are respectively connected to the optical switches in the four line-side switching units 10.

[0130] In some embodiments, a local dimension may include multiple planes, each corresponding to a switching subunit, and each switching subunit is used to schedule the optical signals of the corresponding plane. These multiple planes share multiple line-side switching units. These shared line-side switching units are each connected to an optical fiber. That is, optical signals from one local dimension are simultaneously transmitted to an optical switching node in another dimension via multiple optical fibers. For example, Figure 9 In this context, a local dimension includes two planes, each corresponding to a switching sub-unit 21. The two switching sub-units 21 share four line-side switching units 10, which correspond to the same dimension and are connected to the same optical switching node via four optical fibers.

[0131] Optionally, each plane corresponds to a set of optical signals, and each set of optical signals includes multiple available single-wavelength optical signals. The available single-wavelength optical signals in the sets of optical signals corresponding to different planes have the same wavelength. For example, the available single-wavelength optical signals in the sets of optical signals of two planes may both be 96 wavelengths in the C-band, or both may be 120 wavelengths in the C-band, or a combination of 96 wavelengths in the C-band and multiple wavelengths in the L-band. In practical applications, the single-wavelength optical signals used in each plane can be all or part of the wavelengths in the set of optical signals.

[0132] During optical signal transmission, two single-wavelength optical signals with the same wavelength cannot be transmitted in the same optical fiber. Through the optical cross-connect configuration of the local switching unit 20 and the optical cross-connect configuration of the line-side switching unit 10, single-wavelength optical signals in optical signal sets on different planes can be uniformly scheduled, avoiding the scheduling of two single-wavelength optical signals to the same optical fiber.

[0133] Optionally, each set of optical signals may include multiple wavelength groups. Each wavelength group includes multiple single-wavelength optical signals, each carrying service data and redundant data. Multiple single-wavelength optical signals within the same wavelength group provide mutual protection. That is, when a single-wavelength optical signal in a wavelength group fails to transmit, the service data carried by the failed single-wavelength optical signal can be recovered based on the redundant data carried by the remaining single-wavelength optical signals in that wavelength group.

[0134] Assume that the first wavelength group and the second wavelength group belong to two planes within the same local dimension. The first wavelength group consists of four wavelengths: C1, C2, L1, and L2. Each wavelength carries service data and redundant data, and these four wavelengths protect each other. That is, if any one of the wavelengths C1, C2, L1, and L2 fails to transmit, the service data carried by the failed wavelength can be recovered from the redundant data carried by the remaining three wavelengths. For example, if C1 fails to transmit, the service data carried by C1 can be recovered from the redundant data carried by C2, L1, and L2.

[0135] The second wavelength group consists of four wavelengths: C3, C4, L3, and L4. Each wavelength carries service data and redundant data, and these four wavelengths protect each other. The method of mutual protection is the same as that for the four wavelengths in the first wavelength group.

[0136] Among them, wavelength C1 and wavelength C3 are the same wavelength, wavelength C2 and wavelength C4 are the same wavelength, and wavelengths C1-C4 all belong to the C-band; wavelength L1 and wavelength L3 are the same wavelength, wavelength L2 and wavelength L4 are the same wavelength, and wavelengths L1-L4 all belong to the L-band.

[0137] Multiple single-wavelength optical signals within the same wavelength group can protect each other through electrical layer interleaving. The fewer the number of single-wavelength optical signals in each wavelength group, the higher the proportion of redundant data carried in each single-wavelength optical signal. In implementation, the number of single-wavelength optical signals in each wavelength group can be set as needed, taking into account factors such as the transmission efficiency and reliability of service data.

[0138] For example, assuming each wavelength group includes four single-wavelength optical signals, 25% redundancy can be achieved through electrical layer interleaving. Thus, the service data carried by the one failed single-wavelength optical signal can be recovered based on the redundant data carried by the three successfully transmitted single-wavelength optical signals. Implementation methods can be found in related technologies, and this application does not limit the scope of the embodiments.

[0139] For example, the number of single-wavelength optical signals in each wavelength group can be equal to the number of line-side switching units 10 shared by the two planes. When all the optical fibers connected to the line-side switching units 10 are working normally, the optical signals in each wavelength group can be transmitted through different optical fibers. For example, in the aforementioned first wavelength group, wavelengths C1, C2, L1, and L2 are transmitted in optical fibers 1, 2, 3, and 4, respectively; in the second wavelength group, wavelengths L3, L4, C3, and C4 are transmitted in optical fibers 1, 2, 3, and 4, respectively. This is beneficial for ensuring the normal transmission of service data as much as possible in the event of faults such as fiber breakage, as detailed in the method embodiments below.

[0140] It should be noted that, Figure 9 Only one local dimension corresponding switching sub-unit and one remote dimension corresponding line-side switching unit are shown. In actual applications, optical switching node 10 may include multiple Figure 9 The structure shown is suitable for optical signal transmission in multiple local dimensions and multiple remote dimensions.

[0141] This application also provides an optical switching node, which differs from the aforementioned optical switching node in that the OSW in the line-side switching unit is replaced with a coupler. The coupler includes multiple first ports and one second port, and the multiple first ports and the second port are simultaneously connected. Optical signals input from the second port are simultaneously output from each of the first ports, and optical signals input from any first port are output from the second port.

[0142] Compared to WSS, couplers have lower insertion loss and no filtering effect, which is beneficial to improving the signal transmission performance of optical switching nodes.

[0143] This application also provides a control method for an optical switching node, which can be executed by a computer device to control any of the aforementioned optical switching nodes. Figure 10 This is a flowchart illustrating the control method for an optical switching node provided in an embodiment of this application. Figure 10 As shown, the method includes steps 1001 to 1002.

[0144] 1001: Control the local switching unit to dispatch the first optical signal in the first optical fiber connected to the first line-side switching unit to the second optical fiber connected to the second line-side switching unit.

[0145] The scheduling of the first optical signal can be achieved by switching the scheduling port corresponding to the first optical signal from the first scheduling port to the second scheduling port. The first scheduling port is the scheduling port of the local switching unit connected to the first line-side switching unit, and the second scheduling port is the scheduling port of the local switching unit connected to the second line-side switching unit. The first scheduling port and the second scheduling port correspond to a local dimension.

[0146] The first line-side switching unit and the second line-side switching unit are any two line-side switching units in the optical switching node.

[0147] In some examples, step 1001 can be performed when the first optical fiber connected to the first line-side switching unit fails. By configuring the first optical signal in the failed first optical fiber to the second line-side switching unit, the signal can be transmitted through the second optical fiber connected to the second line-side switching unit, thereby providing service protection.

[0148] In other examples, step 1001 can be performed when another optical signal needs to be routed to the first optical fiber connected to the first line-side switching unit, and this other optical signal has the same wavelength as the first optical signal. To improve the signal transmission performance of the optical switching node, such as recovery capability and system capacity in the event of a fiber break, it may be necessary to reroute the optical signals transmitted in normally functioning optical fibers. In this case, there may be a need to route another optical signal to the first optical fiber for transmission. Alternatively, when the optical fiber in question breaks, there may be a need to route another optical signal to the first optical fiber for transmission. Since two optical signals of the same wavelength cannot be transmitted simultaneously in one optical fiber, the first optical signal needs to be routed to the optical fiber connected to the second line-side switching unit for transmission first.

[0149] In some other examples, step 1001 can be performed after the fault of the second optical fiber connected to the second line-side switching unit has been recovered. For example, the first optical signal is initially configured to be transmitted to the optical switching node of the corresponding dimension via the second optical fiber. Due to a fault in the second optical fiber, the first optical signal is rerouted to the first optical fiber for transmission. When the fault in the second optical fiber is recovered, the first optical signal is rerouted to the second optical fiber for transmission.

[0150] In some examples, if multiple optical signals are transmitted in the first optical fiber, all of the multiple optical signals can be transmitted to the second line-side switching unit.

[0151] In other examples, if multiple optical signals are transmitted in the first optical fiber, these signals can be transmitted to different line-side switching units. In this case, the method further includes controlling a local switching unit to transmit another optical signal in the first optical fiber to a third line-side switching unit. The third line-side switching unit is any line-side switching unit in the optical switching node other than the first and second line-side switching units.

[0152] In one possible implementation, the first line-side switching unit and the second line-side switching unit belong to different line dimensions and are connected to different optical switching nodes. For example, the first line-side switching unit and the second line-side switching unit are... Figures 4 to 8 Any two line-side switching units in any diagram.

[0153] Optionally, if the optical signal transmitted in the second optical fiber connected to the second line-side switching unit includes a third optical signal, and the third optical signal and the first optical signal both belong to the same local dimension, it means that the second port of the optical switch in the second line-side switching unit is connected to the first port of the second scheduling port, and there is no need to switch the optical switch in the second line-side switching unit.

[0154] If the optical signal transmitted in the second optical fiber connected to the second line-side switching unit does not include a third optical signal belonging to the same local dimension as the first optical signal, it means that the second port of the optical switch in the second line-side switching unit is not connected to the first port of the second scheduling port, and the optical switch in the second line-side switching unit needs to be switched.

[0155] In this case, the method also includes:

[0156] 1002: Connect the second port of the target optical switch in the second line-side switching unit to the target port, where the target port is the first port of the target optical switch connected to the second scheduling port.

[0157] For example, for Figure 4 and Figure 5 In the illustrated embodiment, assuming local dimension 1 is initially configured to go to line dimension 1, when line dimension 1 fails, such as due to a fiber breakage, the cross-connect is reconfigured online through the switching component corresponding to local dimension 1, switching the optical signal to an idle redundant dimension, such as line dimension 3. Simultaneously, the optical switch of line dimension 3 needs to connect its second port to the first port connected to the switching component of local dimension 1. In this way, the optical signal from local dimension 1 can be transmitted to the optical switching node of line dimension 3, and then forwarded to the optical switching node of line dimension 1 via the optical switching node of line dimension 3.

[0158] For example, regarding Figure 7 and Figure 8In the illustrated embodiment, assuming local dimension 1 is initially configured to go to line dimension 1, when line dimension 1 fails, such as due to a fiber breakage, the cross-connect is reconfigured online through the first switching subunit, switching the optical signal of local dimension 1 to an idle redundant dimension, such as line dimension 3. Simultaneously, the optical switch of line dimension 3 needs to connect the second port to the first port connected to the eighth port corresponding to local dimension 1. In this way, the optical signal of local dimension 1 can be transmitted to the optical switching node of line dimension 3, and then forwarded to the optical switching node of line dimension 1 via the optical switching node of line dimension 3.

[0159] In another possible implementation, the first line-side switching unit and the second line-side switching unit belong to the same line dimension and are connected to the same optical switching node. For example, the first line-side switching unit and the second line-side switching unit are... Figure 9 Any two line-side switching units in the system.

[0160] exist Figure 9 In the illustrated embodiment, each local dimension includes two planes, with different planes corresponding to different switching sub-units, and the switching sub-units corresponding to the two planes share multiple line-side optical switching units. Therefore, the first port of the optical switch in each line-side switching unit 10 needs to be connected to the two switching sub-units respectively. The first scheduling port and the second scheduling port correspond to one plane in a local dimension.

[0161] Optionally, if the optical signal transmitted in the second optical fiber connected to the second line-side switching unit includes a third optical signal, and the third optical signal and the first optical signal both belong to the same local dimension, the same plane, and the same wavelength band, it means that the second port of the target optical switch in the second line-side switching unit is connected to the first port of the second scheduling port, and there is no need to switch the target optical switch in the second line-side switching unit. Here, the target optical switch is an optical switch used to transmit optical signals in that wavelength band.

[0162] If the optical signal transmitted in the second optical fiber connected to the second line-side switching unit does not include a third optical signal that belongs to the same plane and the same wavelength as the first optical signal in the same local dimension, it means that the second port of the target optical switch in the second line-side switching unit is not connected to the first port of the second scheduling port, and the target optical switch in the second line-side switching unit needs to be switched. In this case, the method also includes the aforementioned step 1002.

[0163] Furthermore, when the local switching unit controls the first optical signal in the first optical fiber connected to the first line-side switching unit to the second optical fiber connected to the second line-side switching unit, if the optical signal transmitted in the second optical fiber includes the second optical signal, and the second optical signal and the first optical signal belong to the same band and correspond to different planes in the local dimension, the switching of the target optical switch in the second line-side switching unit will affect the transmission of the second optical signal.

[0164] In this scenario, the method further includes: controlling the local switching unit to route the second optical signal in the second optical fiber connected to the second line-side switching unit to the third optical fiber connected to the third line-side switching unit, wherein the second optical signal and the first optical signal belong to the same wavelength band but correspond to different planes in the local dimension. Specifically, the first line-side switching unit is connected to the target optical switching node via the first optical fiber, the second line-side switching unit is connected to the target optical switching node via the second optical fiber, and the third line-side switching unit is connected to the target optical switching node via the third optical fiber.

[0165] When the local switching unit controls the first optical signal in the first optical fiber connected to the first line-side switching unit to the second optical fiber connected to the second line-side switching unit, if the optical signal transmitted in the second optical fiber does not include the second optical signal, the switching of the target optical switch in the second line-side switching unit will not affect the transmission of the existing optical signal in the second optical fiber, and there is no need to perform the above-mentioned second optical signal scheduling step.

[0166] for Figure 9 As shown, when a fiber breakage occurs at the optical switching node, in addition to rerouting the optical signals transmitted in the broken fiber to other fibers, it is also necessary to reroute the optical signals transmitted in the intact fibers. This prepares for the possibility of further fiber breaks and reduces service interruption duration. The purpose of rerouting the optical signals transmitted in the intact fibers is to ensure that when another fiber breaks, the optical switch only needs to switch over once at most to restore the transmission of service data on each plane.

[0167] The following is based on Figure 9 Taking the structure shown as an example, the control method of the optical switching node provided in the embodiments of this application will be described.

[0168] like Figure 9 As shown, when there is no fault in optical fibers 1-4, in the first wavelength group, wavelengths C1, C2, L1 and L2 are transmitted in optical fibers 1, 2, 3 and 4 respectively; in the second wavelength group, wavelengths L3, L4, C3 and C4 are transmitted in optical fibers 1, 2, 3 and 4 respectively.

[0169] When fiber 1 breaks, wavelength L3 is redirected to fiber 2 for transmission (corresponding to step 1001); then, wavelength C4 is redirected to fiber 3 for transmission (corresponding to the step of redirecting the second optical signal), and wavelength C1 is redirected to fiber 4 for transmission (corresponding to steps 1001 and 1002). During this process, although redirecting wavelength C1 to fiber 4 requires switching the optical switch, since wavelengths C2, L1, and L2 in the first wavelength group can all transmit normally, the service data carried by wavelength C1 can be recovered based on the redundant data carried by wavelengths C2, L1, and L2, thus having no impact on the service data transmission of plane 1. Simultaneously, during this process, wavelengths L3, L4, C3, and C4 in the second wavelength group can all transmit normally, thus having no impact on the service data transmission of plane 2.

[0170] Here, if we do not consider the possibility of a second fiber breakage if fiber 1 is not restored, both wavelengths L3 and C4 can be scheduled to be transmitted through fiber 2.

[0171] If a second fiber breaks before fiber 1 is restored, the wavelengths in the second broken fiber need to be redirected to the remaining fiber for transmission.

[0172] For example, if fiber 1 is not restored, fiber 2 breaks, and wavelength C2 is reassigned to fiber 4 for transmission (corresponding to step 1001); then, wavelength L1 is reassigned to fiber 4 for transmission (corresponding to the step of reassigning the second optical signal), and wavelengths L3 and L4 are reassigned to fiber 3 for transmission (corresponding to steps 1001 and 1002). In this case, wavelengths C1, C2, L1, and L2 in the first wavelength group all transmit normally, and the service data transmission of plane 1 is unaffected. However, in the second wavelength group, reassigning wavelengths L3 and L4 to fiber 3 requires optical switching. Since the redundant data carried by the remaining wavelengths C1 and C2 cannot be used to recover the service data carried by wavelengths L3 and L4, the service data transmission corresponding to plane 2 will experience a short interruption (e.g., 50ms). After the switchover is completed, the service data of both plane 1 and plane 2 can be transmitted normally, and the service capacity remains unchanged.

[0173] If the third fiber also breaks before the first and second fibers are restored, the services corresponding to the second wavelength group will be interrupted because optical signals of the same wavelength cannot be transmitted simultaneously on the same fiber. The services corresponding to the first wavelength group will be transmitted normally, and the service capacity will be halved.

[0174] For example, if fiber 3 breaks while fiber 1 and fiber 2 are not restored, the services corresponding to wavelengths C3, C4, L3 and L4 will be interrupted, while the services corresponding to wavelengths C1, C2, L1 and L2 will be retained.

[0175] During the switching process, when the first and second optical fibers break, only one optical switch is controlled to switch once. Furthermore, if any other optical fiber breaks while one fiber is broken, there is no need to switch the optical switch, or only one optical switch needs to be switched once to complete the switching.

[0176] Figure 11 This is a block diagram of a control device for an optical switching node provided in an embodiment of this application. This management device can be implemented as part of the optical switching node through software, hardware, or a combination of both. Figure 11 As shown, the control device 1100 includes: a first control module 1101, which controls the local switching unit to schedule the first optical signal in the first optical fiber connected to the first line-side switching unit to the second optical fiber connected to the second line-side switching unit. The first line-side switching unit and the second line-side switching unit are any two line-side switching units among N line-side switching units.

[0177] Optionally, the local switching unit has a first scheduling port connected to the first line-side switching unit and a second scheduling port connected to the second line-side unit, and the first scheduling port and the second scheduling port correspond to a local dimension. The control device 1100 further includes a second control module 1102, used to control the second port of the target optical switch in the second line-side switching unit to be connected to the target port, wherein the target port is the first port connected to the second scheduling port.

[0178] Optionally, the first scheduling port and the second scheduling port correspond to a plane in a local dimension. The first control module 1101 is further configured to control the local switching unit to schedule the second optical signal in the second optical fiber connected to the second line-side switching unit to the third optical fiber connected to the third line-side switching unit. The second optical signal and the first optical signal belong to the same wavelength band but correspond to different planes in the local dimension. Specifically, the first line-side switching unit is connected to the target optical switching node through the first optical fiber, the second line-side switching unit is connected to the target optical switching node through the second optical fiber, and the third line-side switching unit is connected to the target optical switching node through the third optical fiber.

[0179] It should be noted that the control device for the optical switching node provided in the above embodiments is only illustrated by the division of the above functional units when controlling the optical switching node. In practical applications, the above functions can be assigned to different functional units as needed, that is, the internal structure of the device can be divided into different functional units to complete all or part of the functions described above. In addition, the control device for the optical switching node provided in the above embodiments and the control method embodiments for the optical switching node belong to the same concept, and the specific implementation process can be found in the method embodiments, which will not be repeated here.

[0180] In some embodiments, a computer device is also provided, the computer device including a processor and a memory, the memory for storing software programs, the processor running or executing the software programs stored in the memory to enable the computer device to implement the control method for the optical switching node provided in the above method embodiments.

[0181] Figure 12 An exemplary possible architecture diagram of computer device 1200 is provided. For example... Figure 12 As shown, the computer device 1200 includes a memory 1201, a processor 1202, a communication interface 1203, and a bus 1204. The memory 1201, the processor 1202, and the communication interface 1203 are interconnected via the bus 1204.

[0182] The memory 1201 can be a read-only memory (ROM), a static storage device, a dynamic storage device, or a random access memory (RAM). The memory 1201 can store programs. When the program stored in the memory 1201 is executed by the processor 1202, the processor 1202 and the communication interface 1203 are used to execute the control methods for the optical switching node. The memory 1201 can also store data sets; for example, a portion of the storage resources in the memory 1201 may be allocated to a data storage module for storing information about the server unit and networking strategies.

[0183] The processor 1202 may be a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), a graphics processing unit (GPU), or one or more integrated circuits.

[0184] The processor 1202 can also be an integrated circuit chip with signal processing capabilities. In implementation, some or all of the functions of the signal processing device of this application can be accomplished by the integrated logic circuits in the hardware of the processor 1202 or by instructions in software form. The processor 1202 described above can also be a general-purpose processor, a digital signal processor (DSP), an ASIC, a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods disclosed in the above embodiments of this application. The general-purpose processor can be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly embodied in the execution of a hardware decoding processor, or executed by a combination of hardware and software modules in the decoding processor. The software modules can be located in random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, registers, or other mature storage media in the art. The storage medium is located in the memory 1201. The processor 1202 reads the information in the memory 1201 and, in conjunction with its hardware, completes part of the functions of the control device of the optical switching node in this application embodiment.

[0185] The communication interface 1203 uses a transceiver module, such as, but not limited to, a transceiver, to enable communication between the computer device 1200 and other devices or communication networks. For example, information can be obtained through the communication interface 1203.

[0186] Bus 1204 may include a pathway for transmitting information between various components of computer device 1200 (e.g., memory 1201, processor 1202, communication interface 1203).

[0187] In some embodiments, a computer-readable storage medium is also provided, which stores computer instructions. When the computer instructions stored in the computer-readable storage medium are executed by a computer device, the computer device performs the control method for the optical switching node provided in the above method embodiments.

[0188] In some embodiments, a computer program product is also provided, the computer program product including one or more computer program instructions, which, when loaded and run by a computer, cause the computer to execute the control method for the optical switching node provided in the above method embodiments.

[0189] In some embodiments, a chip is also provided, including a memory and a processor. The memory is used to store computer instructions, and the processor is used to call and execute the computer instructions from the memory to perform the control method for the optical switching node provided in the above method embodiments.

[0190] Unless otherwise defined, the technical or scientific terms used herein shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “first,” “second,” “third,” and similar terms used in this patent application specification and claims do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Similarly, the terms “an” or “a” and similar terms do not indicate a quantity limitation, but rather indicate the presence of at least one. The terms “comprising” or “including” and similar terms mean that the elements or objects preceding “comprising” or “including” encompass the elements or objects listed following “comprising” or “including” and their equivalents, and do not exclude other elements or objects. “A and / or B” indicates the presence of three possibilities: first, A; second, B; third, A and B.

[0191] The above is merely one embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An optical switching node, characterized in that, The optical switching node includes: N line-side switching units and local switching units, where N is a positive integer and N is greater than 1; In the N line-side switching units, each line-side switching unit includes X optical switches, where X is a positive integer. Each of the X optical switches includes multiple first ports and at least one second port. Any one of the at least one second port is selectively connected to any one of the multiple first ports. Each optical switch has a first port connected to a scheduling port of the local switching unit.

2. The optical switching node according to claim 1, characterized in that, X equals 1; or X is greater than 1, and at least two of the X optical switches have at least two second ports connected to the same optical fiber.

3. The optical switching node according to claim 2, characterized in that, The X optical switches include a first optical switch and a second optical switch. The first optical switch and the second optical switch are used to transmit optical signals of different wavelengths, and the second ports of the first optical switch and the second optical switch are connected to the same optical fiber.

4. The optical switching node according to any one of claims 1 to 3, characterized in that, The local switching unit includes M switching sub-units. Each of the M switching sub-units includes at least one switching component. Each of the at least one switching component is connected to an optical switch in each line-side switching unit. Each switching component is used to send local optical signals to any of the connected optical switches or to de-path the line-side optical signals sent by any of the connected optical switches.

5. The optical switching node according to claim 4, characterized in that, Each switching component includes a first multiplexer and a first wavelength selection switch. The first multiplexer includes multiple wavelength division ports and one multiplexing port, wherein the multiple wavelength division ports are used to receive single-wavelength optical signals; The first wavelength selection switch has a common port and multiple branch ports. The common port is connected to the multiplexing port, and the multiple branch ports are respectively connected to an optical switch in each line-side switching unit.

6. The optical switching node according to claim 4, characterized in that, Each switching component includes a second wavelength selection switch, which includes multiple third ports and multiple fourth ports. The multiple third ports are used to receive single-wavelength optical signals, and the multiple fourth ports are respectively connected to an optical switch in each line-side switching unit.

7. The optical switching node according to any one of claims 1 to 3, characterized in that, The local switching unit includes a first switching subunit. The first switching subunit includes a third wavelength selection switch and M second multiplexers. Each of the M second multiplexers includes multiple wavelength division ports and one multiplexing port. The multiple wavelength division ports are used to receive single-wavelength optical signals. The third wavelength selection switch has multiple fifth ports and multiple sixth ports. Each of the multiple fifth ports is connected to the multiplexing port of one of the M second multiplexers. The multiple sixth ports are respectively connected to an optical switch in each of the line-side switching units. or, The first switching subunit includes a fourth wavelength selection switch having multiple seventh ports and multiple eighth ports. The multiple seventh ports are used to receive single-wavelength optical signals, and the multiple eighth ports are connected to an optical switch in each of the line-side switching units.

8. The optical switching node according to claim 7, characterized in that, The local switching unit further includes a second switching subunit, the structure of which is the same as that of the first switching subunit.

9. The optical switching node according to any one of claims 1 to 8, characterized in that, The first port of the third optical switch in the first line-side switching unit is connected to the first port of the fourth optical switch in the second line-side switching unit. The first line-side switching unit and the second line-side switching unit are any two of the N line-side switching units, and the optical signal transmitted by the third optical switch and the optical signal transmitted by the fourth optical switch belong to the same wavelength band.

10. An optical communication system, characterized in that, It includes a plurality of optical switching nodes as described in any one of claims 1 to 9, each of the optical switching nodes being connected to at least one other optical switching node.

11. A control method for an optical switching node, characterized in that, The method for controlling an optical switching node as described in any one of claims 1 to 9 includes: The local switching unit controls the dispatching of the first optical signal in the first optical fiber connected to the first line-side switching unit to the second optical fiber connected to the second line-side switching unit. The first line-side switching unit and the second line-side switching unit are any two line-side switching units among the N line-side switching units.

12. The control method according to claim 11, characterized in that, The control local switching unit dispatches the first optical signal in the first optical fiber connected to the first line-side switching unit to the second optical fiber connected to the second line-side switching unit, including: When the first optical fiber fails, the local switching unit controls the first optical signal in the first optical fiber connected to the first line-side switching unit to the second optical fiber connected to the second line-side switching unit.

13. The method according to claim 11 or 12, characterized in that, The local switching unit has a first scheduling port connected to the first line-side switching unit and a second scheduling port connected to the second line-side unit, and the first scheduling port and the second scheduling port correspond to a local dimension. The method further includes: The second port of the target optical switch in the second line-side switching unit is connected to the target port, and the target port is the first port of the target optical switch that is connected to the second scheduling port.

14. The method according to claim 13, characterized in that, The first scheduling port and the second scheduling port correspond to a plane in a local dimension. The method further includes: The local switching unit controls the routing of the second optical signal from the second optical fiber connected to the second line-side switching unit to the third optical fiber connected to the third line-side switching unit. The second optical signal and the first optical signal belong to the same wavelength band but correspond to different planes in the local dimension. The first line-side switching unit is connected to the target optical switching node via the first optical fiber, the second line-side switching unit is connected to the target optical switching node via the second optical fiber, and the third line-side switching unit is connected to the target optical switching node via the third optical fiber.

15. A control device for an optical switching node, characterized in that, The apparatus for controlling an optical switching node as described in any one of claims 1 to 9 includes: The first control module is used to control the local switching unit to schedule the first optical signal in the first optical fiber connected to the first line-side switching unit to the second optical fiber connected to the second line-side switching unit, wherein the first line-side switching unit and the second line-side switching unit are any two line-side switching units among the N line-side switching units.

16. A computer device, characterized in that, The computer device includes a processor and a memory for storing software programs, and the processor enables the computer device to perform the method as described in any one of claims 11 to 14 by running or executing the software programs stored in the memory.

17. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store program code executed by a processor, the program code including instructions for implementing the method as described in any one of claims 11 to 14.

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