Optical cross structure, optical switching node and system

Abstract

An optical cross structure, an optical switching node and a system belong to the technical field of optical networks. The optical cross structure comprises a cross unit, a plurality of first wave combining and separating units and a plurality of optical modules, the first wave combining and separating units are used for connecting the plurality of line wave combining and separating units, and the crossing unit is connected with the plurality of first wave combining and separating units and the plurality of optical modules. The cross unit supports simultaneous execution of transmission operations respectively corresponding to any at least two transmission groups; each transmission group comprises a first wave combining and separating unit and an optical module, and the first wave combining and separating units and the optical modules in different transmission groups are different; the transmission operation corresponding to any transmission group comprises the step of transmitting the optical signal with any wavelength between the first wave combining and splitting unit and the optical module in the transmission group. According to the invention, the problem that the optical switching node is difficult to support high-dimension optical switching can be solved, and the method and the device are used for optical communication.

Description

Technical Field

[0001] The present application relates to the field of optical network technology, and in particular to an optical cross structure, an optical switching node and a system. Background Art

[0002] The optical communication system includes a plurality of optical communication nodes and at least one optical switching node. The optical communication nodes are connected to the optical switching nodes through optical fibers, and data is exchanged through the optical switching nodes. It can be seen that the optical switching nodes are an important part of the optical communication system.

[0003] The optical switching node includes multiple line wave combiner / demultiplexer units and multiple branch wave combiner / demultiplexer units. Any two of these wave combiner / demultiplexer units are interconnected, multiple line wave combiner / demultiplexer units are connected to multiple optical fibers one by one, and multiple branch wave combiner / demultiplexer units are connected to multiple groups of optical modules one by one. Each group of optical modules includes multiple optical modules. By configuring the mapping relationship of the ports of the wave combiner / demultiplexer units, the optical switching node can realize the scheduling and adding and dropping of optical signals of any wavelength. Multiple branch wave combiner / demultiplexer units and multiple optical modules can form an optical cross structure.

[0004] The number of ports connected to the line wavelength combining and demultiplexing units in the branch wavelength combining and demultiplexing units determines the dimension of the optical signals that the optical module can exchange. Currently, the branch wavelength combining and demultiplexing units use multicast switching optical switches (multi-cast switch, MCS) or add and drop wavelength selective switches (add and drop wavelength selective switch, ADWSS). Since the number of ports of MCS and ADWSS is small, the dimension of the optical signals that the optical module can exchange is small. Therefore, it is difficult for optical switching nodes to support higher-dimensional optical switching. Summary of the invention

[0005] The present application provides an optical cross structure, an optical switching node and a system, which can solve the problem that the optical switching node is difficult to support optical switching of higher dimensions. The technical solution is as follows:

[0006] In a first aspect, the present application provides an optical cross structure, comprising: a cross unit, a plurality of first wave combiner / demultiplexer units and a plurality of optical modules; the first wave combiner / demultiplexer units are used to connect a plurality of line wave combiner / demultiplexer units, the cross unit connects the plurality of first wave combiner / demultiplexer units and the plurality of optical modules. The line wave combiner / demultiplexer units may also be connected to one or more optical fibers.

[0007] The cross-connect unit supports the simultaneous execution of transmission operations corresponding to any at least two transmission groups; wherein the transmission group includes the first wavelength combining / decombining unit and the optical module, and the first wavelength combining / decombining unit and the optical module in different transmission groups are different; the transmission operation corresponding to any one of the at least two transmission groups includes: transmitting an optical signal of any wavelength between the first wavelength combining / decombining unit and the optical module in any one of the transmission groups. It is understandable that the wavelengths of the optical signals transmitted in the transmission operations corresponding to different transmission groups are the same or different.

[0008] In this way, at least two optical modules can transmit optical signals of any wavelength (same or different wavelengths) with different first wave combiner / demultiplexer units at the same time through the cross unit, so that the cross unit meets the requirements of wavelength independence, direction independence and contentionless (colorless directionless and contentionless, CDC). Since each first wave combiner / demultiplexer unit is connected to each line wave combiner / demultiplexer unit, at least two optical modules can transmit optical signals of any wavelength (same or different wavelengths) with different line wave combiner / demultiplexer units at the same time through the cross unit, and the whole composed of the multiple first wave combiner / demultiplexer units and the cross unit meets the requirements of CDC. Therefore, the optical cross structure including the multiple first wave combiner / demultiplexer units, the cross unit and the multiple optical modules also meets the requirements of CDC. It can be seen that the multiple optical modules can exchange optical signals of any wavelength (same or different wavelengths) with the optical communication nodes connected to the multiple line wave combiner / demultiplexer units at the same time, so that the optical switching nodes have CDC characteristics.

[0009] For example, the optical signal of the cross unit can go to any line wavelength combining and demultiplexing unit. Therefore, the optical signals of multiple optical modules connected to the cross unit can go to any line wavelength combining and demultiplexing unit, completing the direction-independent function in the CDC. At the same time, multiple first wavelength combining and demultiplexing units can support the simultaneous transmission of multiple optical signals of the same wavelength, so that multiple optical signals of the same wavelength can be simultaneously transmitted to different line wavelength combining and demultiplexing units, which can realize the competition-independent function in the CDC. At the same time, the cross unit can transmit optical signals of any wavelength between any first wavelength combining and demultiplexing unit and any optical module, thereby realizing the wavelength-independent function in the CDC.

[0010] Further, in the optical cross-connection structure provided in the present application, the first wavelength combining and demultiplexing unit is used to connect multiple line wavelength combining and demultiplexing units, and the first wavelength combining and demultiplexing unit is also connected to the cross-connection unit. It can be seen that the port of the first wavelength combining and demultiplexing unit connected to the line wavelength combining and demultiplexing unit is a wavelength demultiplexing port, and the port of the first wavelength combining and demultiplexing unit connected to the cross-connection unit is a wavelength combining port. The first wavelength combining and demultiplexing unit has multiple wavelength demultiplexing ports and one wavelength combining port. In this case, the number of wavelength demultiplexing ports of the first wavelength combining and demultiplexing unit is usually large (greater than the number of ports of MCS and ADWSS in the related art (the maximum value of this number can be 16)). The optical switching dimension that can be supported by the optical switching node where the optical cross-connection structure provided in the present application is located depends on the number of wavelength demultiplexing ports of the first wavelength combining and demultiplexing unit. When the number of wavelength demultiplexing ports is large, the optical switching dimension that can be supported by the optical switching node where the optical cross-connection structure is located can be improved.

[0011] Optionally, the number of the line combining / splitting units is greater than the number of the first combining / splitting units. It can be seen that the number of ports in the first combining / splitting unit used to connect the line combining / splitting units is greater than the number of ports in the cross unit used to connect the first combining / splitting units. For example, the number of ports in the first combining / splitting unit used to connect the line combining / splitting units is 20, 30, 40, 64, etc., and the number of ports in the cross unit used to connect the first combining / splitting units is 8, 10, 16, etc.

[0012] In this case, if the cross unit does not connect the line wave combiner and demultiplexer through the first wave combiner and demultiplexer unit, then the number of line wave combiner and demultiplexer units that the cross unit can connect is small (for example, the number is 8, 10, 16, etc.), so that the optical switching node where the optical cross structure is located supports fewer optical switching dimensions; and if the cross unit adopts the solution of connecting the line wave combiner and demultiplexer through the first wave combiner and demultiplexer unit in the present application, then the number of line wave combiner and demultiplexer units that the cross unit can connect is large (for example, the number is 20, 30, 40, 64, etc.), so that the optical switching node where the optical cross structure is located supports more optical switching dimensions.

[0013] It can be understood that the number of line combining and decomposing units may also be less than or equal to the number of first combining and decomposing units, and this application does not limit this.

[0014] In the above-mentioned embodiment, the optical cross structure includes an cross unit as an example. It can be understood that the optical cross structure can also include multiple cross units. In this case, the optical cross structure also includes multiple second wave combining and decomposing units corresponding to the multiple first wave combining and decomposing units. The first wave combining and decomposing units are connected to multiple cross units through corresponding second wave combining and decomposing units. In this case, each cross unit is connected to multiple first wave combining and decomposing units through multiple second wave combining and decomposing units, and the whole composed of each cross unit and multiple first wave combining and decomposing units has CDC characteristics.

[0015] For example, for each cross unit, the cross unit is connected to multiple line wave combiner / demultiplexer units, so the optical signal of the cross unit can go to any line wave combiner / demultiplexer unit, and the optical signals of multiple optical modules connected to the cross unit can go to any line wave combiner / demultiplexer unit, completing the direction-independent function in the CDC. At the same time, multiple first wave combiner / demultiplexer units can support the simultaneous transmission of multiple optical signals of the same wavelength, so that multiple optical signals of the same wavelength can be transmitted to different line wave combiner / demultiplexer units at the same time, which can realize the competition-independent function in the CDC; at the same time, for each cross unit, the cross unit can transmit optical signals of any wavelength between any first wave combiner / demultiplexer unit and any optical module, thereby realizing the wavelength-independent function in the CDC.

[0016] Optionally, the optical cross structure satisfies at least one of the following conditions:

[0017] The wavelength combining and demultiplexing units (such as line wavelength combining and demultiplexing units, first wavelength combining and demultiplexing units, and second wavelength combining and demultiplexing units) in the optical cross structure are wavelength selective switches (WSS), arrayed waveguide gratings (AWG), splitters, or couplers;

[0018] Furthermore, the cross-connect unit includes at least one of: MCS (multi-cast switch) and ADWSS (add and drop wavelength selective switch).

[0019] Optionally, the optical cross structure further includes: a plurality of optical amplifiers corresponding one-to-one to the plurality of first wave combining and decomposing units; the optical amplifiers are located on the optical path between the corresponding first wave combining and decomposing units and the cross unit.

[0020] For example, when the optical cross structure does not include the second wavelength combining / decombining unit, the optical amplifier is located on the optical path between the corresponding first wavelength combining / decombining unit and the optical cross unit.

[0021] For another example, in the case where the optical cross structure includes a second wave combining and demultiplexing unit, the optical amplifier is located on an optical path between the corresponding first wave combining and demultiplexing unit and the second wave combining and demultiplexing unit. In other words, for any first wave combining and demultiplexing unit among the plurality of first wave combining and demultiplexing units, the optical amplifier corresponding to the first wave combining and demultiplexing unit is located on an optical path between the first wave combining and demultiplexing unit and the second wave combining and demultiplexing unit corresponding to the first wave combining and demultiplexing unit.

[0022] For another example, when the optical cross structure includes a second wavelength multiplexing / demultiplexing unit, each first wavelength multiplexing / demultiplexing unit may correspond to a plurality of optical amplifiers, which are respectively located on the optical path between the second wavelength multiplexing / demultiplexing unit corresponding to the first wavelength multiplexing / demultiplexing unit and the plurality of cross units.

[0023] The optical amplifier is used to amplify the power of the optical signal passing through to improve the quality of the optical signal exchanged by the optical switching node. It is understandable that the optical cross structure may not include an optical amplifier, and this application does not limit this.

[0024] In a second aspect, the present application provides an optical switching node, comprising: a plurality of line wavelength combining and decomposing units, and an optical cross-structure described in any one of the designs in the first aspect; the line wavelength combining and decomposing units can be used to connect one optical fiber or multiple optical fibers, and the first wavelength combining and decomposing unit in the optical cross-structure connects the plurality of line wavelength combining and decomposing units.

[0025] The architecture of the optical switching node can be a distributed architecture or a centralized architecture.

[0026] In the distributed architecture, each line combining and decomposing unit is directly connected to the first combining and decomposing unit.

[0027] In a centralized architecture, the optical switching node further includes: at least one intermediate unit; the first wave combining and decomposing unit connects the plurality of line wave combining and decomposing units through at least some of the intermediate units. The intermediate unit may be a port crossover module (such as a micro-electromechanical systems (MEMS) optical switch) or a WSS, etc.

[0028] For example, when the optical switching node includes an intermediate unit, the intermediate unit connects the plurality of line multiplexing / demultiplexing units and the plurality of first multiplexing / demultiplexing units, and each first multiplexing / demultiplexing unit is connected to all the line multiplexing / demultiplexing units through the intermediate unit.

[0029] As another example, when the optical switching node includes multiple intermediate units, each of the multiple intermediate units can connect each first multiplexer / demultiplexer and each line multiplexer / demultiplexer. In this case, each first multiplexer / demultiplexer can connect each line multiplexer / demultiplexer through each intermediate unit.

[0030] It can be seen that when the optical switching node includes at least one intermediate unit, each intermediate unit is connected to each line multiplexing / demultiplexing unit and each first multiplexing / demultiplexing unit.

[0031] As another example, when the optical switching node includes a plurality of intermediate units, each intermediate unit may be connected to some of the first wave combining and decomposing units and each line wave combining and decomposing unit; and the first wave combining and decomposing units connected to all the intermediate units include all the first wave combining and decomposing units. In this case, the first wave combining and decomposing unit may be connected to all the line wave combining and decomposing units through each intermediate unit in some of the intermediate units, and there are different first wave combining and decomposing units that connect all the line wave combining and decomposing units through different intermediate units.

[0032] As another example, when the optical switching node includes multiple intermediate units, each intermediate unit may be connected to each first wave combining and decomposing unit, and some line wave combining and decomposing units; and the line wave combining and decomposing units connected to all the intermediate units include all the multiple line wave combining and decomposing units. In this case, the first wave combining and decomposing unit may be connected to some line wave combining and decomposing units through each intermediate unit, and all line wave combining and decomposing units may be connected through all the intermediate units.

[0033] The wavelengths of optical signals transmitted on different intermediate units may be the same or different, and this application does not limit this. The wavelength of the optical signal transmitted on each intermediate unit may be part or all of the wavelengths of the optical signal transmitted on the optical switching node (including the optical signal received by the optical switching node and the optical signal emitted by the optical switching node), and the wavelengths of the optical signals transmitted on multiple intermediate units cover all the wavelengths of the optical signals transmitted on the optical switching node.

[0034] Regardless of whether the optical switching node adopts a centralized structure or a distributed architecture, the connection relationship between the line multiplexing / demultiplexing unit and the first multiplexing / demultiplexing unit remains unchanged, and the internal connection relationship of the optical cross structure remains unchanged. Therefore, regardless of whether the optical switching node adopts a centralized structure or a distributed architecture, the optical switching node has the characteristics of CDC.

[0035] In a third aspect, the present application provides an optical communication system, comprising a plurality of optical communication nodes, and an optical switching node as described in any one of the designs in the second aspect, wherein the line combining and decomposing units in the optical switching nodes are connected one-to-one to at least one of the optical communication nodes through at least one optical fiber.

[0036] The effects of the second and third aspects mentioned above can refer to the effects of the corresponding designs in the first aspect, and this application will not elaborate on them here. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram of a third optical switching node provided for related technology;

[0038] Figure 2 A schematic diagram of a fourth optical switching node provided for related technology;

[0039] Figure 3A schematic diagram of a fifth optical switching node provided for related technology;

[0040] Figure 4 A schematic diagram of a first optical switching node provided in an embodiment of the present application;

[0041] Figure 5 A schematic diagram of a second optical switching node provided in an embodiment of the present application;

[0042] Figure 6 A schematic diagram of a third optical switching node provided in an embodiment of the present application;

[0043] Figure 7 A schematic diagram of a distributed architecture provided in an embodiment of the present application;

[0044] Figure 8 A schematic diagram of a centralized architecture provided in an embodiment of the present application;

[0045] Fig. 9 A schematic diagram of a fourth optical switching node provided in an embodiment of the present application;

[0046] Fig.10 A schematic diagram of a fifth optical switching node provided in an embodiment of the present application;

[0047] Fig.11 A schematic diagram of a sixth optical switching node provided in an embodiment of the present application;

[0048] Fig.12 A schematic diagram of a seventh optical switching node provided in an embodiment of the present application;

[0049] Fig.13 A schematic diagram of an optical communication system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0050] In order to make the principles and technical solutions of the present application clearer, the implementation methods of the present application will be further described in detail below in conjunction with the accompanying drawings.

[0051] The optical communication system includes multiple optical communication nodes (such as optical line terminals (OLT), optical transport network (OTN) nodes, etc.), and at least one optical switching node (such as an optical switch, etc.). The optical communication node is connected to the optical switching node through an optical fiber, and exchanges optical signals through the optical switching node, or exchanges optical signals with the optical switching node. It can be seen that the optical switching node is an important part of the optical communication system.

[0052] With the development of technology, the implementation of optical switching nodes has changed. For example, the implementation of optical switching nodes has changed from optical to electrical and then to electrical processing, and then to the later wavelength-based fixed switching network (fixed optical add-drop multiplexer, FOADM), and then to the later reconfigurable optical add-drop multiplexer (ROADM) (such as Figure 1 and Figure 2 As shown in Figure 1, it can be seen that the implementation of optical switching nodes is constantly evolving towards more flexibility, more ports, and more wavelengths.

[0053] Figure 1 and Figure 2 The optical switching nodes shown in the figure all include a plurality of wavelength combining and demultiplexing units, which are divided into: a plurality of line wavelength combining and demultiplexing units and a plurality of branch wavelength combining and demultiplexing units. Figure 1 Any two wave combining and decomposing units are directly interconnected. Figure 2 Any two multiplexing / demultiplexing units are interconnected via an optical cross connection (OXC) backplane. Figure 2 In addition, multiple line multiplexing / demultiplexing units are connected to multiple optical fibers in a one-to-one correspondence, and multiple branch multiplexing / demultiplexing units are connected to multiple groups of optical modules in a one-to-one correspondence ( Figure 1 and Figure 2 The optical module is not shown in the figure). Each group of optical modules includes multiple optical modules. By configuring the mapping relationship of the ports of the wavelength combining and demultiplexing units, the optical switching node can realize the scheduling and adding and dropping of optical signals of any wavelength. Multiple branch wavelength combining and demultiplexing units and multiple optical modules can form an optical cross structure.

[0054] The line combining and decomposing unit may be a wavelength selective switch (WSS) or the like.

[0055] The line combining and demultiplexing unit has a first port and N second ports (ports are not shown in the drawings), N>1. The first port is connected to an optical fiber, some of the N second ports are connected to other line combining and demultiplexing units in a one-to-one correspondence, and the other second ports are connected to branch combining and demultiplexing units in a one-to-one correspondence. In this way, by configuring the mapping relationship between the first port and the second port, the optical signal can be transmitted between the first port and any second port.

[0056] The branch combining and demultiplexing unit can be an MCS (multi-cast switch, multicast switching optical switch) (such as Figure 3As shown), ADWSS (add and drop wavelength selective switch) Figure 3 MCS in can be replaced by ADWSS) etc.

[0057] The branch combining and demultiplexing unit has a plurality of third ports and a plurality of fourth ports, wherein the plurality of third ports are connected to a plurality of line combining and demultiplexing units in a one-to-one correspondence, and the plurality of fourth ports are connected to an optical module in a group of optical modules in a one-to-one correspondence. By configuring the mapping relationship between the third port and the fourth port, an optical signal of any wavelength can be transmitted between any third port and any fourth port. In addition, the plurality of fourth ports can simultaneously transmit optical signals of the same or different wavelengths with different third ports. In this way, it is possible to realize that a plurality of optical modules in a group of optical modules can simultaneously transmit optical signals of the same or different wavelengths with different line combining and demultiplexing units, so that the optical switching node has wavelength-independent, direction-independent and contentionless (CDC) characteristics.

[0058] Colorless means wavelength independence, which means that any fourth port can transmit optical signals of different wavelengths; directionless means direction independence, which means that any fourth port can transmit optical signals with any line wavelength combination and demultiplexing unit; contentionless means competition independence, which means that multiple fourth ports can simultaneously transmit optical signals of the same or different wavelengths with the line wavelength combination and demultiplexing units.

[0059] The number of the third ports of the branch combiner / demultiplexer unit determines the dimension of the optical signal that the optical module can exchange (which can be understood as the number of line combiner / demultiplexer units). Currently, the branch combiner / demultiplexer unit uses MCS or ADWSS. Since MCS and ADWSS are limited by technology and insertion loss, the number of their third ports is small (basically less than 16), which makes the dimension of the optical signal that the optical module can exchange small (such as less than 16).

[0060] However, with the development of optical networks, the number of optical fibers connected to optical switching nodes is increasing (e.g., greater than 16), and the number of line wavelength combining and demultiplexing units is also increasing. As a result, the optical switching nodes need to support higher dimensions of optical signals that can be exchanged by optical modules. However, the optical switching nodes with CDC characteristics in the related art are limited by the small number of third ports. Therefore, it is difficult for the optical switching nodes to support higher-dimensional optical switching.

[0061] The present application provides an optical cross structure, in which an optical switching node has a CDC characteristic and can support high-dimensional optical switching.

[0062] For example, Figure 4 As shown, the optical cross structure 01 includes: a cross unit 011, a plurality of first multiplexing / demultiplexing units 012 and a plurality of optical modules 013. The cross unit 011 connects a plurality of first multiplexing / demultiplexing units 012 and a plurality of optical modules 013. The first multiplexing / demultiplexing unit 012 is used to connect a plurality of line multiplexing / demultiplexing units 02.

[0063] The line wavelength combining / decomposing unit 02 can also be used to connect one optical fiber 03 or multiple optical fibers 03 , and different line wavelength combining / decomposing units 02 are connected to different optical fibers 03 . Figure 4 In the example, multiple line wavelength combining and demultiplexing units 02 are connected to multiple optical fibers 03 in a one-to-one correspondence. In this case, each line wavelength combining and demultiplexing unit 012 is connected to one optical fiber 03. The line wavelength combining and demultiplexing unit 02 can be connected to one optical communication node through each connected optical fiber 03.

[0064] By way of example, the line multiplexing / demultiplexing unit 02 may have at least one first port and multiple second ports, the first multiplexing / demultiplexing unit 012 may have multiple third ports and one fifth port, and the cross unit 011 may have multiple fourth ports and multiple sixth ports. The first port of the line multiplexing / demultiplexing unit 02 is connected to the optical fiber 03, a part of the second ports of the line multiplexing / demultiplexing unit 02 is connected to multiple other line multiplexing / demultiplexing units 02 in a one-to-one correspondence, and another part of the second ports is connected to multiple third ports of the first multiplexing / demultiplexing unit 012 in a one-to-one correspondence. Multiple third ports of the first multiplexing / demultiplexing unit 012 are connected to multiple second ports of the line multiplexing / demultiplexing units 02 in a one-to-one correspondence. The fifth port of the first multiplexing / demultiplexing unit 012 is connected to the sixth port of the cross unit 011. Multiple sixth ports of the cross unit 011 are connected to multiple first multiplexing / demultiplexing units 012 in a one-to-one correspondence. Multiple fourth ports of the cross unit 011 are connected to multiple optical modules 013 in a one-to-one correspondence. The optical signal transmitted between the line combining and demultiplexing unit and the optical module will be transmitted in sequence along the direction of the second port, the third port, the fifth port, the sixth port and the fourth port (or the opposite direction of the direction), so as to realize the transmission of the optical signal between the line combining and demultiplexing unit and the optical module, and then realize the exchange of optical signals of the optical communication node connected by the optical module and the line combining and demultiplexing unit through the optical fiber. It can be seen that the optical module and the optical communication node can exchange optical signals through the cross unit, the first combining and demultiplexing unit, and the line combining and demultiplexing unit. The present application can configure the mapping relationship between the first port and the second port in the line combining and demultiplexing unit 02, the mapping relationship between the fifth port and the third port in the first combining and demultiplexing unit 012, and the mapping relationship between the sixth port and the fourth port in the cross unit 011 according to the optical communication node or optical module to which the optical signal needs to be transmitted.

[0065] The cross unit 011 connects a plurality of first wavelength combining and demultiplexing units 012 and a plurality of optical modules 013. Moreover, the cross unit 011 simultaneously performs transmission operations corresponding to any at least two transmission groups; wherein, a transmission group includes a first wavelength combining and demultiplexing unit 012 and an optical module 013, and the first wavelength combining and demultiplexing units 012 and the optical modules 013 in different transmission groups are different; the transmission operation corresponding to any one of the at least two transmission groups includes: transmitting an optical signal of any wavelength between the first wavelength combining and demultiplexing unit 012 and the optical module 013 in the transmission group. The wavelengths of the optical signals transmitted in the transmission operations corresponding to different transmission groups (i.e., the optical signals transmitted between the first wavelength combining and demultiplexing unit and the optical module in the transmission group) are the same or different.

[0066] In this way, at least two optical modules can transmit optical signals of any wavelength (same or different wavelengths) with different first wave combining and demultiplexing units at the same time through the cross unit, so that the cross unit meets the requirements of CDC. Since each first wave combining and demultiplexing unit is connected to each line wave combining and demultiplexing unit, at least two optical modules can transmit optical signals of any wavelength (same or different wavelengths) with different line wave combining and demultiplexing units at the same time through the cross unit, and the whole composed of the multiple first wave combining and demultiplexing units and the cross unit meets the requirements of CDC. Therefore, the optical cross structure including the multiple first wave combining and demultiplexing units, the cross unit and the multiple optical modules also meets the requirements of CDC. It can be seen that the multiple optical modules can simultaneously exchange optical signals of any wavelength (same or different wavelengths) with the optical communication nodes connected by the multiple line wave combining and demultiplexing units through optical fibers, so that the optical switching nodes have CDC characteristics.

[0067] It can be understood that the transmission group in the present application is not fixed. The cross unit can adjust the first multiplexing / demultiplexing unit and the optical module in the transmission group according to the optical communication nodes and optical modules that need to exchange optical signals so that the optical communication nodes and the optical modules can exchange optical signals.

[0068] The optical cross structure provided by the present application supports: multiple optical modules 013 can simultaneously transmit optical signals of different wavelengths to the cross unit 011, and these optical signals can be transmitted to different first wavelength combining and decomposing units 012 through different sixth ports, and then transmitted to different line wavelength combining and decomposing units 02. It can be seen that multiple optical modules 013 can simultaneously transmit optical signals of different wavelengths with multiple line wavelength combining and decomposing units 02, so that the optical switching node has CDC characteristics. On this basis, multiple optical modules 013 can also simultaneously transmit optical signals of the same wavelength with multiple line wavelength combining and decomposing units 02.

[0069] For example, the optical signals of the multiple sixth ports of the cross unit 011 can go to any line wavelength combining and demultiplexing unit 02, so the optical signals of the multiple fourth ports of the cross unit 011 can go to any line wavelength combining and demultiplexing unit 02, completing the direction-independent function in the CDC. At the same time, the multiple fifth ports of the multiple first wavelength combining and demultiplexing units 012 can support the simultaneous transmission of multiple optical signals of the same wavelength, so that multiple optical signals of the same wavelength can be simultaneously transmitted to different line wavelength combining and demultiplexing units, which can realize the competition-independent function in the CDC; at the same time, the cross unit 011 has multiple sixth ports and multiple fourth ports, and any sixth port can transmit an optical signal of any wavelength with any fourth port, so that the cross unit 011 can transmit an optical signal of any wavelength between any first wavelength combining and demultiplexing unit and any optical module, thereby realizing the wavelength-independent function in the CDC.

[0070] Further, the first multiplexing / demultiplexing unit 012 is used to connect multiple line multiplexing / demultiplexing units 02, and the first multiplexing / demultiplexing unit 012 is also connected to the cross unit 011. It can be seen that the port (the third port mentioned above) of the first multiplexing / demultiplexing unit 012 connected to the line multiplexing / demultiplexing unit 02 is a demultiplexing port, and the port (the fifth port mentioned above) of the first multiplexing / demultiplexing unit 012 connected to the cross unit 011 is a multiplexing port (also called a COM port). The first multiplexing / demultiplexing unit 012 has multiple demultiplexing ports and one multiplexing port. In this case, the number of demultiplexing ports of the first multiplexing / demultiplexing unit 012 is usually large (greater than the number of the third ports of the above-mentioned MCS and ADWSS). For example, the maximum value of the number of the third ports can be 16, and then the number of demultiplexing ports of the first multiplexing / demultiplexing unit 012 can be greater than 16.

[0071] According to the introduction of the present application, the optical switching dimension that the optical switching node where the optical cross structure provided by the present application is located can support depends on the number of demultiplexing ports of the first wavelength combining and demultiplexing unit. When the number of demultiplexing ports is large, the optical switching dimension that the optical switching node where the optical cross structure is located can be improved.

[0072] Optionally, the number of line multiplexing / demultiplexing units 02 is greater than the number of first multiplexing / demultiplexing units 012. It can be seen that the number of ports in the first multiplexing / demultiplexing unit 012 used to connect the line multiplexing / demultiplexing units 02 is greater than the number of ports in the cross unit 011 used to connect the first multiplexing / demultiplexing unit 012. For example, the number of ports in the first multiplexing / demultiplexing unit 012 used to connect the line multiplexing / demultiplexing units 02 is 20, 30, 40, 64, etc., and the number of ports in the cross unit 011 used to connect the first multiplexing / demultiplexing unit 012 is 8, 10, 16, etc. As an illustrative example, Figure 5 As shown, Figure 4 The number (4) of the line multiplexing / demultiplexing units 02 may also be greater than the number (2) of the first multiplexing / demultiplexing units 012.

[0073] When the number of line multiplexing / demultiplexing units 02 is greater than the number of first multiplexing / demultiplexing units 012, if the cross unit 011 is not connected to the line multiplexing / demultiplexing units 02 through the first multiplexing / demultiplexing units 012, the number of line multiplexing / demultiplexing units 02 that can be connected to the cross unit 011 is small (for example, the number is 8, 10, 16, etc., Figure 5 The number of cross units 011 in the optical cross structure is 2), so that the optical switching node where the optical cross structure is located supports fewer optical switching dimensions; and if the cross unit 011 adopts the solution of connecting the line multiplexing / demultiplexing unit 02 through the first multiplexing / demultiplexing unit 012 in the present application, then the number of line multiplexing / demultiplexing units 02 that can be connected to the cross unit 011 is large (for example, the number is 20, 30, 40, 64, etc., Figure 5 The number in is 4), so that the optical switching node where the optical cross structure is located supports more optical switching dimensions.

[0074] It is understandable that the present application does not limit the relationship between the number of line multiplexing / demultiplexing units 02 and the number of first multiplexing / demultiplexing units 012 , and the number of line multiplexing / demultiplexing units may be less than, equal to, or greater than the number of first multiplexing / demultiplexing units.

[0075] The cross-connect unit 011 may include at least one of MCS and ADWSS.

[0076] The first wave combining and demultiplexing unit 012 can be a structure having wave combining and demultiplexing functions, such as a WSS, an arrayed waveguide grating (AWG), a splitter, or a coupler.

[0077] The line combining and decomposing unit 02 can be a structure with combining and decomposing functions, such as WSS, AWG, splitter, combiner, etc.

[0078] Of course, the cross-connect unit 011 may not include at least one of the MCS and ADWSS, and the line multiplexing / demultiplexing unit 02 and the first multiplexing / demultiplexing unit 012 may not be WSS, AWG, splitter or combiner.

[0079] In the above embodiment, the optical cross structure 01 includes one cross unit 011 as an example. It can be understood that the optical cross structure 01 may also include a plurality of cross units 011 .

[0080] For example, Figure 6 As shown, the optical cross structure 01 further includes a plurality of second wave combining and decomposing units 014 corresponding to the plurality of first wave combining and decomposing units 012. The first wave combining and decomposing units 012 are connected to the plurality of cross units 011 ( Figure 6The second wave combining and decomposing unit 014 may also be a structure having the wave combining and decomposing function, such as a WSS, an AWG, a splitter, a combiner, etc.

[0081] The second multiplexing / demultiplexing unit 014 may have a seventh port and a plurality of eighth ports. The seventh port is connected to the fifth port of the first multiplexing / demultiplexing unit 012 corresponding to the second multiplexing / demultiplexing unit 014, and the plurality of eighth ports are connected to the sixth ports of the plurality of cross units 011 in a one-to-one correspondence. The plurality of sixth ports of each cross unit 011 are connected to the eighth ports of the plurality of second multiplexing / demultiplexing units 014 in a one-to-one correspondence.

[0082] When the optical cross structure 01 includes multiple cross units 011, each cross unit 011 is connected to multiple first multiplexing / demultiplexing units 012 via multiple second multiplexing / demultiplexing units 014, and the whole composed of each cross unit 011 and multiple first multiplexing / demultiplexing units has CDC characteristics.

[0083] For example, for each cross unit 011, the optical signals of the multiple sixth ports of the cross unit 011 can go to any line wavelength combining and demultiplexing unit 02, so the optical signals of the multiple fourth ports of the cross unit 011 can go to any line wavelength combining and demultiplexing unit 02, completing the direction-independent function in the CDC. At the same time, the multiple fifth ports of the multiple first wavelength combining and demultiplexing units 012 can support the simultaneous transmission of multiple optical signals of the same wavelength, so that multiple optical signals of the same wavelength can be simultaneously transmitted to different line wavelength combining and demultiplexing units 02, which can realize the competition-independent function in the CDC; at the same time, for each cross unit 011, the cross unit 011 has multiple sixth ports and multiple fourth ports, and any sixth port can transmit an optical signal of any wavelength with any fourth port, so that the cross unit 011 can transmit an optical signal of any wavelength between any first wavelength combining and demultiplexing unit and any optical module, thereby realizing the wavelength-independent function in the CDC.

[0084] Alternatively, refer to the above Figure 4 , Figure 5 or Figure 6 The optical cross structure 01 further includes: a plurality of optical amplifiers 015 corresponding to the plurality of first wavelength combining and decomposing units 012. The optical amplifiers 015 are used to amplify the power of the optical signal passing through to improve the quality of the optical signal transmitted on the optical switching node.

[0085] The optical amplifier 015 is located on the optical path between the corresponding first multiplexing / demultiplexing unit 012 and the cross unit 011. Figure 4 and Figure 5 In the embodiment, the optical amplifier 015 is located on the optical path between the corresponding first multiplexing / demultiplexing unit 012 and the optical cross-connect unit 011. Figure 6In the embodiment, the optical amplifier 015 is located on the optical path between the corresponding first wavelength combining / decombining unit 012 and the second wavelength combining / decombining unit 014 (the second wavelength combining / decombining unit 014 corresponding to the first wavelength combining / decombining unit 012).

[0086] It is understandable that the optical cross structure 01 may not include the optical amplifier 015, and this application does not limit this. In addition, when the optical cross structure includes the second wavelength combining and decomposing unit, the position of the optical amplifier 105 may also be the same as Figure 6 The positions shown are different, for example, an optical amplifier is provided on the optical path between the second wavelength combining / decombining unit 014 and each cross unit 011. At this time, each first wavelength combining / decombining unit 012 may also correspond to a plurality of optical amplifiers, which are respectively located on the optical path between the second wavelength combining / decombining unit 014 corresponding to the first wavelength combining / decombining unit and a plurality of cross units 011.

[0087] Based on the optical cross structure provided by the present application, the present application also provides an optical switching node, as described above Figure 4 , Figure 5 or Figure 6 As shown, the optical switching node includes: a plurality of line multiplexing and demultiplexing units 02, and any optical cross structure 01 provided in the present application. The number of optical cross structures in the optical switching node can be one or more, and the present application does not limit this.

[0088] The optical cross structure 01 may belong to the client side of the optical switching node, and the line wavelength combining and demultiplexing unit 02 may belong to the line side of the optical switching node. Each first wavelength combining and demultiplexing unit 012 in the optical cross structure 01 is connected to the multiple line wavelength combining and demultiplexing units 02. Each line wavelength combining and demultiplexing unit 02 in the above-mentioned multiple line wavelength combining and demultiplexing units 02 may be used to connect at least one optical fiber 03. In the present application, the example of multiple line wavelength combining and demultiplexing units 02 correspondingly connecting multiple optical fibers is taken as an example.

[0089] The architecture of the optical switching node can be a distributed architecture or a centralized architecture. Figure 4 , Figure 5 and Figure 6 The architecture of the optical switching node shown is a distributed architecture. In a distributed architecture, Figure 7 As shown, each line combining / decomposing unit 02 is directly connected to the first combining / decomposing unit 012. In a centralized architecture, Figure 8 As shown, the optical switching node includes, in addition to the above optical cross structure 01 and multiple line multiplexing / demultiplexing units 02, at least one intermediate unit 04 (the intermediate unit is also called a centralized switching engine), Figure 8In the figure, two intermediate units 04 are taken as an example. The first wavelength combining / decomposing unit 012 is connected to the above-mentioned multiple line wavelength combining / decomposing units 02 through at least one intermediate unit 04 in the optical switching node. The intermediate unit 04 can be a port cross-connect module (a module that performs optical cross-connection based on ports (rather than wavelengths), such as a MEMS optical switch) or a WSS, etc. The first wavelength combining / decomposing unit 012 in the optical cross-connect structure 01 is connected to the line wavelength combining / decomposing unit 02 through the intermediate unit 04.

[0090] Figure 4 , Figure 5 and Figure 6 The architecture of the optical switching node shown is a distributed architecture as an example. It can be understood that the architecture of the optical switching node provided in the present application may not be a distributed architecture. For example, the architecture of the optical switching node is a centralized architecture. Figure 4 When the optical switching node shown in the figure adopts a centralized architecture, the structure of the optical switching node can be as follows Fig. 9 shown in Figure 6 When the optical switching node shown in the figure adopts a centralized architecture, the structure of the optical switching node can be as follows Fig.10 shown.

[0091] In the case where the optical switching node adopts a centralized architecture, each first wavelength combining and demultiplexing unit 012 is still connected to multiple line wavelength combining and demultiplexing units 02. Therefore, for any cross unit 011, the optical signals of the multiple sixth ports of the cross unit 011 can go to any line wavelength combining and demultiplexing unit 02. Therefore, the optical signals of the multiple fourth ports of the cross unit 011 can go to any line wavelength combining and demultiplexing unit 02, completing the direction-independent function in the CDC. At the same time, the multiple fifth ports of the multiple first wavelength combining and demultiplexing units 012 can support the simultaneous transmission of multiple optical signals of the same wavelength, so that multiple optical signals of the same wavelength can be transmitted to different line wavelength combining and demultiplexing units at the same time, and the competition-independent function in the CDC can be realized. At the same time, for any cross unit 011, the cross unit 011 has multiple sixth ports and multiple fourth ports, and any sixth port can exchange optical signals of any wavelength with any fourth port, so that the cross unit 011 can transmit optical signals of any wavelength between any first wavelength combining and demultiplexing unit and any optical module, thereby realizing the wavelength-independent function in the CDC.

[0092] In the present application, each first wavelength combining / decomposing unit 012 needs to be connected to a plurality of line wavelength combining / decomposing units 02. In the case where the first wavelength combining / decomposing unit 012 in the optical cross structure is connected to the line wavelength combining / decomposing unit 02 via the intermediate unit 04, if the optical switching node includes an intermediate unit 04, then the intermediate unit 04 can connect each first wavelength combining / decomposing unit 012 and each line wavelength combining / decomposing unit 02. At this time, each first wavelength combining / decomposing unit 012 can be connected to each line wavelength combining / decomposing unit 02 via the intermediate unit 04.

[0093] If the optical switching node includes multiple intermediate units 04, each of the multiple intermediate units 04 can connect each first multiplexing / demultiplexing unit 012 and each line multiplexing / demultiplexing unit 02. In this case, each first multiplexing / demultiplexing unit 012 can connect each line multiplexing / demultiplexing unit 02 through each intermediate unit 04.

[0094] Fig. 9 and Fig.10 In the example, each intermediate unit 04 is connected to each first multiplexing / demultiplexing unit 012, and each intermediate unit 04 is also connected to each line multiplexing / demultiplexing unit 02. Fig. 9 and Fig.10 As shown, the intermediate unit 04 has a plurality of ninth ports and a plurality of tenth ports, the plurality of ninth ports are connected to the second ports of the plurality of line multiplexing / demultiplexing units 02 in a one-to-one correspondence, and the plurality of tenth ports are connected to the third ports of the plurality of first multiplexing / demultiplexing units 012 in a one-to-one correspondence. The plurality of second ports of the line multiplexing / demultiplexing units 02 are connected to the ninth ports of the plurality of intermediate units 04 in a one-to-one correspondence, and the plurality of third ports of the first multiplexing / demultiplexing units 012 are connected to the tenth ports of the plurality of intermediate units 04 in a one-to-one correspondence.

[0095] It can be seen that when the optical switching node includes at least one intermediate unit, each intermediate unit connects each line multiplexing / demultiplexing unit and each first multiplexing / demultiplexing unit. It is understandable that not every intermediate unit 04 connects each first multiplexing / demultiplexing unit 012 and each line multiplexing / demultiplexing unit 02.

[0096] 1. In an optional implementation, when the optical switching node includes a plurality of intermediate units 04, each intermediate unit 04 may be connected to a portion of the first multiplexer / demultiplexer units 012 and each line multiplexer / demultiplexer unit 02; and the first multiplexer / demultiplexer units 012 connected to all the intermediate units 04 in the plurality of intermediate units 04 include all the first multiplexer / demultiplexer units 012 (the plurality of first multiplexer / demultiplexer units 012). In this case, the first multiplexer / demultiplexer units 012 may be connected to all the line multiplexer / demultiplexer units 02 through each intermediate unit 04 in the portion of the intermediate units 04, and there may be different first multiplexer / demultiplexer units 012 that are connected to all the line multiplexer / demultiplexer units 02 through different intermediate units 04.

[0097] For example, Fig.11As shown, each intermediate unit 04 is connected to each line multiplexing / demultiplexing unit 02. Furthermore, the first intermediate unit 04 counted from top to bottom is connected to the first two first multiplexing / demultiplexing units 012 counted from top to bottom. The second intermediate unit 04 counted from top to bottom is connected to the last two first multiplexing / demultiplexing units 012 counted from top to bottom. Each of the first two first multiplexing / demultiplexing units 012 is connected to each line multiplexing / demultiplexing unit 02 via the first intermediate unit 04. Each of the last two first multiplexing / demultiplexing units 012 is connected to each line multiplexing / demultiplexing unit 02 via the second intermediate unit 04.

[0098] 2. In another optional implementation, when the optical switching node includes multiple intermediate units 04, each intermediate unit 04 may be connected to each first wavelength combining / decomposing unit 012 and some line wavelength combining / decomposing units 02, and the line wavelength combining / decomposing units 02 connected to all the intermediate units 04 include all the multiple line wavelength combining / decomposing units 02. In this case, the first wavelength combining / decomposing unit 012 may be connected to some line wavelength combining / decomposing units 02 through each intermediate unit 04, and all line wavelength combining / decomposing units 02 may be connected through all the intermediate units 04.

[0099] For example, Fig.12 As shown, each intermediate unit 04 is connected to each first wave combining and demultiplexing unit 012. Furthermore, the first intermediate unit 04 counted from top to bottom is connected to the first two line wave combining and demultiplexing units 02 counted from top to bottom. The second intermediate unit 04 counted from top to bottom is connected to the last two line wave combining and demultiplexing units 02 counted from top to bottom. Each first wave combining and demultiplexing unit 012 can be connected to the first two line wave combining and demultiplexing units 02 through the first intermediate unit 04, and connected to the last two line wave combining and demultiplexing units 02 through the second intermediate unit 04, so that each first wave combining and demultiplexing unit 012 can be connected to each line wave combining and demultiplexing unit 02.

[0100] The wavelengths of the optical signals transmitted on different intermediate units 04 may be the same or different, and this application does not limit this. The wavelength of the optical signal transmitted on each intermediate unit 04 may be part or all of the wavelengths of the optical signal transmitted on the optical switching node (the optical signal received by the optical switching node and the optical signal emitted by the optical switching node), and the wavelengths of the optical signals transmitted on multiple intermediate units 04 cover all the wavelengths of the optical signals transmitted on the optical switching node.

[0101] Compared with the distributed architecture, the number of second ports of the line multiplexing / demultiplexing unit 02 in the centralized architecture is less, and the number of third ports of the first multiplexing / demultiplexing unit 012 is also less. Moreover, compared with the distributed architecture, in the centralized architecture, each line multiplexing / demultiplexing unit 02 can also be connected through the intermediate unit 04, while in the distributed architecture, each line multiplexing / demultiplexing unit 02 is directly connected.

[0102] In addition, each line multiplexing / demultiplexing unit 02 may also be connected to each other. In this way, the optical communication nodes connected to each line multiplexing / demultiplexing unit 02 can exchange optical signals through the optical switching node.

[0103] Based on the optical switching node provided by the present application, the present application also provides an optical communication system. The optical communication system includes multiple optical communication nodes, and any optical switching node provided by the present application. The line combining and demultiplexing unit in the optical switching node is connected to at least one optical communication node in a one-to-one correspondence through at least one optical fiber. It can be seen that each line combining and demultiplexing unit can be connected to one optical fiber or multiple optical fibers, and the line combining and demultiplexing unit can be connected to the optical communication node through the connected optical fiber. In the present application, it is taken as an example that each line combining and demultiplexing unit is connected to one optical fiber.

[0104] For example, an optical switching node such as Figure 4 As shown in the example, the optical communication system can be Fig.13 As shown. It can be seen that multiple optical communication nodes are connected to multiple optical fibers one by one, and each optical communication node is connected to an optical switching node through a corresponding optical fiber. The optical signal provided by the optical communication node can be exchanged to other optical communication nodes on the optical switching node, or it can be exchanged to an optical module in the optical switching node on the optical switching node. The optical signal provided by the optical module can be exchanged to any optical communication node.

[0105] Optionally, an optical amplifier may be provided on each optical fiber. It is understandable that an optical amplifier may not be provided on the optical fiber, and this application does not limit this.

[0106] On the basis of the optical cross structure, optical switching node, and optical communication system structure provided in the present application, other structures (not shown in the drawings) may be further provided on the optical paths of these structures.

[0107] For example, when the optical cross structure 01 does not include the second wavelength combining / decombining unit 014 , other structures different from the above optical amplifier may be arranged on the optical path between the first wavelength combining / decombining unit 012 and the cross unit 011 .

[0108] For another example, when the optical cross structure 01 includes the second wavelength combining and demultiplexing unit 014, other structures different from the above-mentioned optical amplifier may also be arranged on the optical path between the first wavelength combining and demultiplexing unit 012 and the second wavelength combining and demultiplexing unit 014, and on the optical path between the second wavelength combining and demultiplexing unit 014 and the cross unit 011.

[0109] For another example, other structures different from the intermediate node 04 may be arranged on the optical path between the first wavelength combining / decombining unit 012 and the line wavelength combining / decombining unit 02 .

[0110] For another example, the optical fiber connected to the line multiplexing / demultiplexing unit 02 may also be provided with other structures different from the optical amplifier.

[0111] In this application, the terms "first" and "second" etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. The term "at least one" refers to one or more, and "plurality" refers to two or more, unless otherwise expressly limited. The term "and / or" in this application is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0112] In the corresponding embodiments provided in this application, it should be understood that the disclosed structure can be implemented by other configuration methods. For example, the embodiments described above are merely illustrative.

[0113] The above is only an optional implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. An optical cross structure, characterized in that: include: A cross unit, a plurality of first wavelength combining and demultiplexing units, and a plurality of optical modules; The first wave combining and decomposing unit is used to connect multiple line wave combining and decomposing units; The cross unit connects the plurality of first wavelength combining and decomposing units and the plurality of optical modules, and the cross unit supports simultaneously executing transmission operations corresponding to any at least two transmission groups; In which, the transmission group includes the first wavelength combining and decomposing unit and the optical module, and the first wavelength combining and decomposing unit and the optical module in different transmission groups are different; the transmission operation corresponding to any transmission group of the at least two transmission groups includes: transmitting an optical signal of any wavelength between the first wavelength combining and decomposing unit and the optical module in any transmission group.

2. The optical cross structure according to claim 1, characterized in that: The number of the line multiplexing / demultiplexing units is greater than the number of the first multiplexing / demultiplexing units.

3. The optical cross structure according to claim 1 or 2, characterized in that: The optical cross structure comprises: a plurality of cross units, and a plurality of second wave combining and decomposing units corresponding one by one to the plurality of first wave combining and decomposing units; The first wave combining and decomposing units are connected to the plurality of crossover units through the corresponding second wave combining and decomposing units.

4. The optical cross structure according to any one of claims 1 to 3, characterized in that: The optical cross structure satisfies at least one of the following conditions: The wavelength combining and decomposing units in the optical cross structure are wavelength selective switches WSS, arrayed waveguide gratings AWG, combiners or splitters; Furthermore, the cross-connect unit includes at least one of a multicast switching optical switch MCS and an add / drop wavelength selective switch ADWSS.

5. The optical cross structure according to claim 1 or 2, characterized in that: The optical cross structure further includes: a plurality of optical amplifiers corresponding one-to-one to the plurality of first multiplexing / demultiplexing units; The optical amplifier is located on the optical path between the corresponding first wavelength combining and decomposing unit and the cross unit.

6. The optical cross structure according to claim 3, characterized in that: The optical cross structure further includes: a plurality of optical amplifiers corresponding one-to-one to the plurality of first multiplexing / demultiplexing units; The optical amplifier is located on the optical path between the corresponding first wavelength combining / decombining unit and the second wavelength combining / decombining unit.

7. An optical switching node, characterized in that: The optical switching node comprises: a plurality of line multiplexing and demultiplexing units, and an optical cross structure according to any one of claims 1 to 6; The first wavelength combining / decomposing unit in the optical cross structure is connected to the plurality of line wavelength combining / decomposing units.

8. The optical switching node according to claim 7, characterized in that: The optical switching node further includes: at least one intermediate unit, and the intermediate unit connects the plurality of line multiplexing / demultiplexing units and the plurality of first multiplexing / demultiplexing units.

9. The optical switching node according to claim 7, characterized in that: The optical switching node further comprises: the plurality of intermediate units; The intermediate unit connects some of the first multiplexer / demultiplexer units among the multiple first multiplexer / demultiplexer units and the multiple line multiplexer / demultiplexer units; the first multiplexer / demultiplexer units connected by the multiple intermediate units include the multiple first multiplexer / demultiplexer units.

10. The optical switching node according to claim 7, characterized in that: The optical switching node further comprises: the plurality of intermediate units; The intermediate unit connects the plurality of first multiplexer / demultiplexer units and some of the line multiplexer / demultiplexer units among the plurality of line multiplexer / demultiplexer units; the line multiplexer / demultiplexer units connected by the plurality of intermediate units include the plurality of line multiplexer / demultiplexer units.

11. The optical switching node according to any one of claims 8 to 10, characterized in that: The intermediate unit is a port cross module or a WSS.

12. An optical communication system, characterized in that: It comprises a plurality of optical communication nodes and an optical switching node as described in any one of claims 7 to 11, wherein the line multiplexing / demultiplexing units in the optical switching node are connected to at least one of the optical communication nodes in a one-to-one correspondence via at least one optical fiber.

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