An optical switching device and optical cross-connect network

Abstract

The embodiment of the application provides an optical switching device and an optical cross-connect network, relates to the technical field of optical communication, and is used for improving the problem that the schedulable dimension of the optical cross-connect network is limited. The optical switching device comprises an optical switching engine and a plurality of wavelength division multiplexers. The optical switching engine comprises a plurality of connection ports. The wavelength division multiplexer comprises a red-blue band filter, an input port, an output port and an input-output port. The red-blue band filter is used for allowing an optical signal in a first passband to pass in the transmission direction from the input port to the input-output port and allowing an optical signal in a second passband to pass in the transmission direction from the input-output port to the output port. The input-output port is connected with the connection port of the optical switching engine. The optical switching device can be applied to the optical cross-connect network.

Description

Technical Field

[0001] This application relates to the field of optical communication technology, and in particular to an optical switching device and an optical cross-connect network. Background Technology

[0002] With the rapid upgrade of data centers, increasingly higher demands are being placed on the interconnection within these centers. The port speeds between switches are evolving rapidly, from 100G to 400G, and then quickly to 800G. Existing electrical switches cannot meet the requirements for low power consumption and low latency. Therefore, related technologies in data centers and other fields are employing Optical Cross-Connect (OXC) networks to meet these requirements.

[0003] In optical cross-connect networks provided by related technologies, their schedulable dimensions and scale are jointly determined by the optical switching engine and the networking method. However, the optical modules of the optical switching engine generally adopt a two-fiber bidirectional transmission method, thus requiring two ports of the optical switching engine, which limits the improvement of schedulable dimensions. Utility Model Content

[0004] This application provides an optical switching device and an optical cross-connect network to improve the problem of limited schedulable dimension expansion in optical cross-connect networks.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, an optical switching device is provided, which includes an optical switching engine and multiple wavelength division multiplexers. The optical switching engine includes multiple connection ports, and the wavelength division multiplexers and the connection ports are configured in a one-to-one correspondence.

[0007] The wavelength division multiplexer includes a red-blue band filter, an input port, an output port, and an input-output port. The red-blue band filter allows optical signals in the first passband to pass through in the transmission direction from the input port to the input-output port, and allows optical signals in the second passband to pass through in the transmission direction from the input-output port to the output port. The input-output port is connected to the connection port of the optical switching engine.

[0008] This design offers several advantages. First, when connecting the optical switching device to a dual-fiber bidirectional optical module, the optical module can connect to a port in the optical switching engine via a wavelength division multiplexer (WDM), enabling bidirectional optical communication within the optical channel established by the optical engine. This improves the multiplexing rate of the optical channel, which in turn increases the port multiplexing rate, effectively doubling the number of ports. This, in turn, increases the schedulable dimensions and scale of the optical switching engine, facilitating network deployment. Second, by utilizing the bandgap transmission characteristics of the red-blue band filters in the WDM, backscattering interference of the optical signal, dynamic crosstalk within the optical switching engine, and system link loss can be reduced. This reduces the power budget performance requirements of the optical module, achieving overall high performance and cost-effectiveness in the optical cross-connect network. For example, in a specific optical cross-connect network employing the aforementioned optical switching device, the inter-port dynamic crosstalk of the optical switching engine is less than -45dB. In contrast, in optical cross-connect networks using existing technology, the inter-port dynamic crosstalk of the optical switching engine is greater than -30dB.

[0009] In some possible implementations, the multiple connection ports include multiple first ports and multiple second ports, and the optical switching engine is used to control the connection of any first port and any second port.

[0010] Multiple wavelength division multiplexers include multiple first wavelength division multiplexers and multiple second wavelength division multiplexers. The first wavelength division multiplexers are connected to a first port in a one-to-one correspondence, and the second wavelength division multiplexers are connected to a second port in a one-to-one correspondence. The first passband of the first wavelength division multiplexer and the second passband of the second wavelength division multiplexer are the same, and the second passband of the first wavelength division multiplexer is the same as the first passband of the second wavelength division multiplexer.

[0011] This design facilitates direct communication between the two optical modules when the optical switching device is connected to the dual-fiber bidirectional optical module, and also isolates interference from other optical signals.

[0012] In some possible implementations, the optical switching device includes at least one first wavelength division multiplexing (WDM) device, which integrates at least two first WDM multiplexers; and / or, the optical switching device includes at least one second WDM device, which integrates at least two second WDM multiplexers. By employing integrated WDM devices, the integration level of the optical switching device can be improved, and costs can be reduced by multiplexing the structures of different WDM multiplexers.

[0013] In some possible implementations, the optical switching device includes a first wavelength division multiplexing (WDM) device that integrates all the first WDM multiplexers; and / or, the optical switching device includes a second WDM device that integrates all the second WDM multiplexers. This design facilitates further improvement in the integration of the optical switching device while simultaneously reducing costs.

[0014] In some possible implementations, in the first wavelength division multiplexing (WDM) device, the red and blue band filters of all the first WDM multiplexers are integrated into a single structure; and / or, in the second WDM device, the red and blue band filters of all the second WDM multiplexers are integrated into a single structure. Designing the red and blue band filters as a single structure further improves the integration of the optical switching device and also helps to further reduce costs.

[0015] In some possible implementations, the wavelength division multiplexer further includes a first coupling lens and a second coupling lens. The input port and output port are located on one side of the first coupling lens, and the red-blue band filter is located on the other side of the first coupling lens. The second coupling lens is disposed between the input / output port and the red-blue band filter. The first coupling lens is used to couple the optical signal output from the red-blue band filter to the output port, and to couple the optical signal output from the input port to the red-blue band filter. The second coupling lens is used for optical signals between the input / output port and the red-blue band filter. By using the first and second coupling lenses, the coupling efficiency of the optical signal in the wavelength division multiplexer can be improved, thereby improving the signal transmission quality.

[0016] In a second aspect, an optical cross-connect network is provided, which includes an optical switching device as described in any one of the first aspects and a plurality of optical modules. The optical switching device includes a plurality of wavelength division multiplexers, and the optical modules in the plurality of optical modules are configured one-to-one with the wavelength division multiplexers in the plurality of wavelength division multiplexers.

[0017] The optical module includes a transmitter and a receiver. The transmitter is connected to the input port of the wavelength division multiplexer, and the receiver is connected to the output port of the wavelength division multiplexer.

[0018] The technical effects achievable by the optical cross-connect network provided in this application are the same as those achievable by the optical switching device in the first aspect mentioned above, and will not be repeated here.

[0019] Thirdly, an optical cross-connect network is provided, which includes an optical switching engine, multiple optical modules, and multiple wavelength division multiplexers. The optical switching engine includes multiple connection ports, and the optical modules include transmitters and receivers. Each wavelength division multiplexer is connected to a corresponding connection port, and each wavelength division multiplexer is also connected to a corresponding optical module.

[0020] The wavelength division multiplexer includes a red-blue band filter, an input port, an output port, and an input-output port. The input port is connected to the transmitting end of the optical module, the output port is connected to the receiving end of the optical module, and the input-output port is connected to the connection port. The red-blue band filter is used to allow optical signals in the first passband to pass through in the transmission direction from the input port to the input-output port, and to allow optical signals in the second passband to pass through in the transmission direction from the input-output port to the output port.

[0021] In the optical cross-connect network provided in this application, by setting up a wavelength division multiplexer, the dual-fiber bidirectional transmission of the optical module can be converted into single-fiber bidirectional transmission (Bi-Directional, BiDi); thus, the optical module can be connected to a single port in the optical switching engine. This design enables bidirectional transmission of optical signals within the optical channels established by the optical switching engine, thereby improving the multiplexing rate of the optical channels, i.e., improving the port multiplexing rate, and effectively doubling the number of ports. This further increases the schedulable dimensions and scale of the optical switching engine, which is beneficial for network deployment. Furthermore, the wavelength division multiplexer converts the dual-fiber bidirectional transmission of the optical module into single-fiber bidirectional transmission through a segmented transmission method. This method can reduce backscattering interference of the optical signal, dynamic crosstalk within the optical switching engine, and system link loss, thereby reducing the power budget performance requirements of the optical module and achieving overall high performance and economy in the optical cross-connect network. For example, in one specific application of the above-mentioned optical cross-connect network, the dynamic crosstalk between ports of the optical switching engine is less than -45dB. In optical cross-connect networks using existing technologies, the dynamic crosstalk between ports of the optical switching engine is greater than -30dB.

[0022] In some possible implementations, the multiple connection ports include multiple first ports and multiple second ports, and the optical switching engine is used to control the connection of any first port and any second port.

[0023] Multiple wavelength division multiplexers include multiple first wavelength division multiplexers and multiple second wavelength division multiplexers. The first wavelength division multiplexers are connected to a first port in a one-to-one correspondence, and the second wavelength division multiplexers are connected to a second port in a one-to-one correspondence. The first passband of the first wavelength division multiplexer and the second passband of the second wavelength division multiplexer are the same, and the second passband of the first wavelength division multiplexer is the same as the first passband of the second wavelength division multiplexer.

[0024] The multiple optical modules include multiple first optical modules and multiple second optical modules. The first optical modules are connected to the first wavelength division multiplexer in a one-to-one correspondence, and the second optical modules are connected to the second wavelength division multiplexer in a one-to-one correspondence. The transmitting wavelength of the first optical module is equal to the receiving wavelength of the second optical module, and the receiving wavelength of the first optical module is equal to the transmitting wavelength of the second optical module.

[0025] This design facilitates direct communication between the first and second optical modules and isolates interference from other optical signals.

[0026] In some possible implementations, the optical cross-connect network includes at least one first wavelength division multiplexing (WDM) device, which integrates at least two first WDM multiplexers; and / or, the optical cross-connect network includes at least one second WDM device, which integrates at least two second WDM multiplexers. By employing integrated WDM devices, the integration level of the optical cross-connect network can be improved, and costs can be reduced by reusing the structures of different WDM multiplexers.

[0027] In some possible implementations, the optical cross-connect network includes a first wavelength division multiplexing (WDM) device that integrates all first WDM multiplexers; and / or, the optical cross-connect network includes a second WDM device that integrates all second WDM multiplexers. This design facilitates further improvement in the integration of the optical cross-connect network while simultaneously reducing costs.

[0028] In some possible implementations, in the first wavelength division multiplexing (WDM) device, the red and blue band filters of all the first WDM multiplexers are integrated into a single structure; and / or, in the second WDM device, the red and blue band filters of all the second WDM multiplexers are integrated into a single structure. Designing the red and blue band filters as a single structure helps to further improve the integration of the optical cross-connect network, while also helping to further reduce costs.

[0029] In some possible implementations, the wavelength division multiplexer further includes a first coupling lens and a second coupling lens. The input port and output port are located on one side of the first coupling lens, and the red-blue band filter is located on the other side of the first coupling lens. The second coupling lens is disposed between the input / output port and the red-blue band filter. The first coupling lens is used to couple the optical signal output from the red-blue band filter to the output port, and to couple the optical signal output from the input port to the red-blue band filter. The second coupling lens is used for optical signals between the input / output port and the red-blue band filter. By using the first and second coupling lenses, the coupling efficiency of the optical signal in the wavelength division multiplexer can be improved, thereby improving the signal transmission quality. Attached Figure Description

[0030] Figure 1 A schematic diagram of an optical cross-connect network provided in an embodiment of this application;

[0031] Figure 2 for Figure 1 A schematic diagram of the optical switching engine;

[0032] Figure 3 for Figure 1 A schematic diagram of the optical module;

[0033] Figure 4 for Figure 1 Schematic diagram of a medium wavelength division multiplexer;

[0034] Figure 5 A schematic diagram of a first wavelength division multiplexing device or a second wavelength division multiplexing device provided in the embodiments of this application;

[0035] Figure 6 A schematic diagram of another optical cross-connect network provided in an embodiment of this application;

[0036] Figure 7 This is a schematic diagram of another optical cross-connect network provided in an embodiment of this application. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them.

[0038] In the following embodiments of this application, the terms "first," "second," etc., are used for descriptive convenience only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0039] In the embodiments of this application, "upper", "lower", "left" and "right" are not limited to the orientation of the components in the accompanying drawings. It should be understood that these directional terms can be relative concepts, used for relative description and clarification, and can change accordingly depending on the orientation of the components in the accompanying drawings.

[0040] In the embodiments of this application, unless the context otherwise requires, the term "comprising" is interpreted as open and encompassing throughout the specification and claims, meaning "including, but not limited to." In the description of the specification, terms such as "one embodiment," "some embodiments," "exemplary embodiment," "exemplarily," or "some examples" are intended to indicate that a particular feature, structure, material, or characteristic associated with that embodiment or example is included in at least one embodiment or example of this application. The illustrative representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics mentioned may be included in any suitable manner in any one or more embodiments or examples.

[0041] As used herein, “about,” “approximately,” or “approximately” includes the stated value and the average value within an acceptable range of deviation from the given value, wherein the acceptable range of deviation is determined by a person skilled in the art taking into account the measurement under discussion and the error associated with the measurement of the given quantity (i.e., the limitations of the measurement system).

[0042] As used herein, “parallel,” “perpendicular,” and “equal” include the described situation and situations that are similar to the described situation, within an acceptable range of deviation, which is determined by those skilled in the art taking into account the measurement under discussion and the error associated with the measurement of a particular quantity (i.e., the limitations of the measurement system). For example, “parallel” includes absolute parallelism and approximate parallelism, where an acceptable range of deviation for approximate parallelism may be, for example, within 5°; “perpendicular” includes absolute perpendicularity and approximate perpendicularity, where an acceptable range of deviation for approximate perpendicularity may also be, for example, within 5°; “equal” includes absolute equality and approximate equality, where an acceptable range of deviation for approximate equality may be, for example, a difference between the two equals being less than or equal to 5% of either one.

[0043] It should be understood that when a layer or element is referred to as being on another layer or substrate, it can mean that the layer or element is directly on the other layer or substrate, or that there is an intermediate layer between the layer or element and the other layer or substrate.

[0044] Exemplary embodiments are described in this application with reference to cross-sectional views and / or plan views and / or equivalent circuit diagrams, which are idealized exemplary drawings. In the drawings, the thickness of layers and regions is enlarged for clarity. Therefore, variations in shape relative to the drawings are contemplated due to, for example, manufacturing techniques and / or tolerances. Thus, exemplary embodiments should not be construed as being limited to the shapes of the regions shown herein, but rather include shape deviations due to, for example, manufacturing processes. For example, etched regions shown as rectangular would typically have curved features. Therefore, the regions shown in the drawings are schematic in nature, and their shapes are not intended to show the actual shapes of the regions of the device, nor are they intended to limit the scope of the exemplary embodiments.

[0045] This application provides an optical cross-connect (OXC) network 100, which can be applied to scenarios such as optical transmission networks (OTN), data center networks (DCN), computing networks, and optical sensor networks. For example, this optical cross-connect network 100 can be used to implement data center interconnect (DCI) networking.

[0046] like Figure 1 As shown, the optical cross-connect network 100 includes an optical switching engine 1, multiple wavelength division multiplexing (WDM) units 3, and multiple optical modules 5. The optical switching engine 1 is used to implement the optical circuit switch (OCS) function, and depending on the technology used to implement the OCS, it may include a micro-electro-mechanical system (MEMS) micromirror array or a liquid crystal (LC) modulator, etc.

[0047] In the optical cross-connect network 100 provided in the embodiments of this application, such as Figure 2 As shown, the optical switching engine 1 includes multiple first ports and multiple second ports, and the number of first ports and second ports is usually equal. The multiple first ports of the optical switching engine 1 are located on one side of the optical switching engine 1, in the attached... Figure 2 The diagram illustrates three first ports, denoted as A1-A3. Multiple second ports of optical switching engine 1 are located on the other side of optical switching engine 1, in the attached... Figure 2 The diagram illustrates three second ports, designated B1-B3. Optical switching engine 1 is used to establish connections between first ports A1-A3 and second ports B1-B3 to form optical channels and to disconnect connections to cut off optical channels, thereby achieving optical path switching. For example, in... Figure 2 An optical channel is formed by establishing a connection between the first port A1 and the second port B3, allowing optical signals to be transmitted bidirectionally between them. No optical channel is formed between the first ports A2 and A3 and the second ports B1 and B2, therefore optical signals cannot be transmitted between them.

[0048] For ease of description, the first ports A1-A3 and the second ports B1-B3 are collectively referred to as connection ports in this article. The number of connection ports is the number of ports of the optical switching engine 1. The more ports the optical switching engine 1 has, the larger the schedulable dimensions and scale.

[0049] Please continue to refer to this. Figure 1 The optical cross-connect network 100 also includes multiple wavelength division multiplexers 3 and multiple optical modules 5. For example, Figure 3 As shown, optical module 5 is a signal transmission device capable of photoelectric and electro-optical conversion, including a transmitting end Tx and a receiving end Rx. At the transmitting end Tx, optical module 5 converts an electrical signal into a transmitted optical signal and outputs it. At the receiving end Rx, it converts the input received optical signal back into an electrical signal. In the optical cross-connect network 100 provided in this embodiment, optical module 5 is a dual-fiber bidirectional device, meaning that both the transmitting end Tx and the receiving end Rx are connected to an independent optical fiber, and the transmitted and received optical signals use different wavelengths.

[0050] A wavelength division multiplexer 3 is a passive optical device capable of transmitting optical signals from different optical fibers in the same optical fiber. In the optical cross-connect network 100 provided in this embodiment, such as... Figure 4 As shown, the wavelength division multiplexer 3 is a three-port device, including a red-blue band filter 8, an input port D, an output port E, and an input-output port C. The red-blue band filter 8 is used to separate or combine optical signals in the "red band" and "blue band". Corresponding to the scheme of this application, the red-blue band filter 8 allows the optical signal of the first passband to pass through in the transmission direction from the input port D to the input-output port C; and allows the optical signal of the second passband to pass through in the transmission direction from the input-output port C to the output port E. That is, the wavelength division multiplexer 3 can allow the optical signal of the first passband to pass through in the transmission direction from the input port D to the input-output port C; and allow the optical signal of the second passband to pass through in the transmission direction from the input-output port C to the output port E. Using this segmented transmission method, optical signals transmitted in two optical fibers can be converted to be transmitted in the same optical fiber.

[0051] In some embodiments, such as Figure 4 As shown, the wavelength division multiplexer 3 also includes a first coupling lens 9 and a second coupling lens 10. The input port D and output port E are located on one side of the first coupling lens 9, and the red-blue band filter 8 is located on the other side of the first coupling lens 9. That is, the first coupling lens 9 is positioned between the input port D, the output port E, and the red-blue band filter 8. The first coupling lens 9 is used to couple optical signals transmitted between the red-blue band filter 8 and the input port D, and between the red-blue band filter 8 and the output port E. The second coupling lens 10 is positioned between the red-blue band filter 8 and the input / output port C, and is used to couple optical signals transmitted between the red-blue band filter 8 and the input / output port C.

[0052] Please continue to refer to this. Figure 1In the optical cross-connect network 100 provided in this embodiment, the optical module 5 is connected to the connection ports (e.g., first ports A1-A3 and second ports B1-B3) in the optical switching engine 1 via a wavelength division multiplexer 3. Specifically, the transmitting end Tx of the optical module 5 is connected to the input port D of the wavelength division multiplexer 3, and the receiving end Rx of the optical module 5 is connected to the output port E of the wavelength division multiplexer 3. The input and output ports C of the wavelength division multiplexer 3 are connected to the connection ports (e.g., first ports A1-A3 and second ports B1-B3) of the optical switching engine 1.

[0053] Depending on the connection ports (first port A1-A3 and second port B1-B3), wavelength division multiplexer 3 can be divided into a first wavelength division multiplexer 2 connected to the first port A1-A3 and a second wavelength division multiplexer 6 connected to the second port B1-B3. Optical module 5 can be divided into a first optical module 4 connected to the first wavelength division multiplexer 2 and a second optical module 7 connected to the second wavelength division multiplexer 6. The first optical module 4 is used to transmit a first wavelength optical signal and receive a second wavelength optical signal; the second optical module 7 is used to transmit a second wavelength optical signal and receive a second wavelength optical signal. The first passband of the first wavelength division multiplexer 2 includes the first wavelength, and the second passband includes the second wavelength; the first passband of the second wavelength division multiplexer 6 includes the second wavelength, and the second passband of the second wavelength division multiplexer 6 is the same as the first passband of the second wavelength division multiplexer 2.

[0054] During operation, the optical switching engine 1 establishes a connection between a first port A1-A3 and a second port B1-B3 according to communication requirements, forming an optical channel connecting the first port A1-A3 and the second port B1-B3. The first optical module 4 connected to the first port A1-A3 and the second optical module 7 connected to the second port B1-B3 can achieve bidirectional communication through the optical channel.

[0055] Specifically, the transmitted optical signal generated by the transmitting end Tx of the first optical module 4 is transmitted through the following paths: the input port D of the first wavelength division multiplexer 2, the input / output port C of the first wavelength division multiplexer 2, the first port A1-A3 of the optical switching engine 1, the optical channel established by the optical switching engine 1, the second port B1-B3 of the optical switching engine 1, the input / output end of the second wavelength division multiplexer 6, the output port E of the second wavelength division multiplexer 6, and finally received by the receiving end Rx of the second optical module 7.

[0056] The transmitted optical signal generated by the transmitting end Tx of the second optical module 7 is transmitted through the following paths: input port D of the second wavelength division multiplexer 6, input / output port C of the second wavelength division multiplexer 6, second port B1-B3 of the optical switching engine 1, optical channel established by the optical switching engine 1, first port A1-A3 of the optical switching engine 1, input / output end of the first wavelength division multiplexer 2, output port E of the first wavelength division multiplexer 2, and finally received by the receiving end Rx of the first optical module 4.

[0057] Therefore, it can be seen that in the optical cross-connect network 100 provided in this application embodiment, by setting the wavelength division multiplexer 3, the dual-fiber bidirectional transmission of the optical module 5 can be converted into single-fiber bidirectional transmission (Bi-Directional, BiDi); thus, the optical module 5 can be connected to one of the connection ports of the optical switching engine 1. This design enables bidirectional transmission of optical signals in the optical channel established by the optical switching engine 1, thereby improving the multiplexing rate of the optical channel, that is, improving the port multiplexing rate, and achieving a doubling of the number of ports. Furthermore, the wavelength division multiplexer 3 converts the dual-fiber bidirectional transmission of the optical module 5 into single-fiber bidirectional transmission through a split-band transmission method. This method can reduce backscattering interference of the optical signal and reduce dynamic crosstalk and system link loss within the optical switching engine 1, thereby reducing the power budget performance requirements of the optical module 5 and achieving overall high performance and economy of the optical cross-connect network 100.

[0058] In the optical cross-connect network 100 provided in the embodiments of this application, the multiple wavelength division multiplexers 3 can be single devices or integrated designs, that is, at least two wavelength division multiplexers 3 with the same function can be integrated together.

[0059] Based on this, in some embodiments, such as Figure 5 and Figure 6 As shown, the optical cross-connect network 100 may include a first wavelength division multiplexing device 11, which integrates at least two first wavelength division multiplexers 2. The maximum number of first wavelength division multiplexers 2 integrated in the first wavelength division multiplexing device 11 generally does not exceed the number of first ports A1-A3 in the optical switching engine 1.

[0060] Similarly, such as Figure 5 and Figure 6 As shown, the optical cross-connect network 100 may also include a second wavelength division multiplexing device 12, which integrates at least two second wavelength division multiplexers 6. The maximum number of second wavelength division multiplexers 6 integrated in the second wavelength division multiplexing device 12 generally does not exceed the number of second ports B1-B3 in the optical switching engine 1.

[0061] For example, with optical switching engine 1 having 128 first ports and 128 second ports, the optical cross-connect network 100 may include 64 first wavelength division multiplexing (WDM) devices 11, each integrating two first WDM multiplexers 2. The optical cross-connect network 100 may also include 64 second wavelength division multiplexing (WDM) devices 12, each integrating two second WDM multiplexers 6.

[0062] In another exemplary embodiment, with optical switching engine 1 having 128 first ports and 128 second ports, the optical cross-connect network 100 may include two first wavelength division multiplexing (WDM) devices 11, each integrating 64 first WDM multiplexers 2. The optical cross-connect network 100 may also include two second WDM devices 12, each integrating 64 second WDM multiplexers 6.

[0063] As another example, when the optical switching engine 1 has 128 first ports and 128 second ports, the optical cross-connect network 100 may include a first wavelength division multiplexing device 11, which integrates 128 first wavelength division multiplexers 2. The optical cross-connect network 100 may also include a second wavelength division multiplexing device 12, which integrates 128 second wavelength division multiplexers 6.

[0064] Furthermore, when the optical cross-connect network 100 includes more than one first wavelength division multiplexing device 11, different first wavelength division multiplexing devices 11 can integrate different numbers of first wavelength division multiplexers 2. Similarly, when the optical cross-connect network 100 includes more than one second wavelength division multiplexing device 12, different second wavelength division multiplexing devices 12 can integrate different numbers of second wavelength division multiplexers 6.

[0065] In the above embodiments, the first wavelength division multiplexing device 11 integrates at least two first wavelength division multiplexers 2. In this case, such as Figure 5 As shown, the red-blue band filters 8 of all the first wavelength division multiplexers 2 in the first wavelength division multiplexing device 11 can be integrated into a single structure. Correspondingly, a lens array with multiple first coupling lenses 9 and a lens array with multiple second coupling lenses 10 are respectively arranged on both sides of the red-blue band filter 8. This design enables the reuse of the underlying components of the device, thereby helping to further improve the integration of the optical cross-connect network 100 and reduce costs.

[0066] Similarly, in the above embodiments, the second wavelength division multiplexing device 12 integrates at least two second wavelength division multiplexers 6. In this case, the red and blue band filters 8 of all the second wavelength division multiplexers 6 in the second wavelength division multiplexing device 12 can adopt an integrated structure. Correspondingly, a lens array with multiple first coupling lenses 9 and a lens array with multiple second coupling lenses 10 are respectively arranged on both sides of the red and blue band filter 8. This design can realize the reuse of the underlying components of the device, thereby helping to further improve the integration of the optical cross-connect network 100 and reduce costs.

[0067] In some embodiments, such as Figure 7 As shown, the wavelength division multiplexer 3 can be integrated with the optical switching engine 1 to form an optical switching device 13. This design helps to simplify the connection relationship of the optical cross-connect network 100.

[0068] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. An optical switching device, characterized in that, The optical switching device includes an optical switching engine and multiple wavelength division multiplexers. The optical switching engine includes multiple connection ports, and the wavelength division multiplexers and the connection ports are configured in a one-to-one correspondence. The wavelength division multiplexer includes a red-blue band filter, an input port, an output port, and an input-output port. The red-blue band filter allows optical signals in a first passband to pass through in the transmission direction from the input port to the input-output port, and allows optical signals in a second passband to pass through in the transmission direction from the input-output port to the output port. The input-output port is connected to the connection port of the optical switching engine.

2. The optical switching device according to claim 1, characterized in that, The plurality of connection ports include a plurality of first ports and a plurality of second ports, and the optical switching engine is used to control the connection between any of the first ports and any of the second ports; The plurality of wavelength division multiplexers include a plurality of first wavelength division multiplexers and a plurality of second wavelength division multiplexers. The first wavelength division multiplexers are connected to the first ports in a one-to-one correspondence, and the second wavelength division multiplexers are connected to the second ports in a one-to-one correspondence. The first passband of the first wavelength division multiplexer and the second passband of the second wavelength division multiplexer are the same, and the second passband of the first wavelength division multiplexer and the first passband of the second wavelength division multiplexer are the same.

3. The optical switching device according to claim 2, characterized in that, The optical switching device includes at least one first wavelength division multiplexing device, wherein at least two first wavelength division multiplexers are integrated in the first wavelength division multiplexing device; And / or, the optical switching device includes at least one second wavelength division multiplexing device, wherein at least two second wavelength division multiplexers are integrated in the second wavelength division multiplexing device.

4. The optical switching device according to claim 2, characterized in that, The optical switching device includes a first wavelength division multiplexing device, which integrates all the first wavelength division multiplexers. And / or, the optical switching device includes a second wavelength division multiplexing device, in which all the second wavelength division multiplexers are integrated.

5. The optical switching device according to claim 3 or 4, characterized in that, In the first wavelength division multiplexing device, all the red and blue band filters of the first wavelength division multiplexer are integrated into a single structure; And / or, in the second wavelength division multiplexing device, the red and blue band filters of all the second wavelength division multiplexers are integrated into a single structure.

6. The optical switching device according to any one of claims 1 to 4, characterized in that, The wavelength division multiplexer further includes a first coupling lens and a second coupling lens, with the input port and the output port located on one side of the first coupling lens, and the red-blue band filter located on the other side of the first coupling lens; the second coupling lens is disposed between the input / output port and the red-blue band filter; The first coupling lens is used to couple the optical signal output from the red-blue band filter to the output port, and to couple the optical signal output from the input port to the red-blue band filter; the second coupling lens is used for the optical signal between the input / output port and the red-blue band filter.

7. An optical cross-connect network, characterized in that, The optical cross-connect network includes an optical switching device as described in any one of claims 1 to 6 and a plurality of optical modules. The optical switching device includes a plurality of wavelength division multiplexers, and the optical modules in the plurality of optical modules are configured one-to-one with the wavelength division multiplexers in the plurality of wavelength division multiplexers. The optical module includes a transmitter and a receiver. The transmitter is connected to the input port of the wavelength division multiplexer, and the receiver is connected to the output port of the wavelength division multiplexer.

8. An optical cross-connect network, characterized in that, The optical cross-connect network includes: An optical switching engine, the optical switching engine including multiple connection ports; Multiple optical modules, each optical module including a transmitter and a receiver; and Multiple wavelength division multiplexers; each wavelength division multiplexer is connected to a connection port in a one-to-one correspondence, and each wavelength division multiplexer is also connected to an optical module in a one-to-one correspondence; The wavelength division multiplexer includes a red-blue band filter, an input port, an output port, and an input-output port. The input port is connected to the transmitting end of the optical module, the output port is connected to the receiving end of the optical module, and the input-output port is connected to the connection port. The red-blue band filter allows optical signals in a first passband to pass through in the transmission direction from the input port to the input-output port, and allows optical signals in a second passband to pass through in the transmission direction from the input-output port to the output port.

9. The optical cross-connect network according to claim 8, characterized in that, The plurality of connection ports include a plurality of first ports and a plurality of second ports, and the optical switching engine is used to control the connection between any of the first ports and any of the second ports; The plurality of wavelength division multiplexers include a plurality of first wavelength division multiplexers and a plurality of second wavelength division multiplexers. The first wavelength division multiplexers are connected to the first ports in a one-to-one correspondence, and the second wavelength division multiplexers are connected to the second ports in a one-to-one correspondence. The first passband of the first wavelength division multiplexer and the second passband of the second wavelength division multiplexer are the same, and the second passband of the first wavelength division multiplexer and the first passband of the second wavelength division multiplexer are the same. The plurality of optical modules includes a plurality of first optical modules and a plurality of second optical modules. The first optical modules are connected to the first wavelength division multiplexer in a one-to-one correspondence, and the second optical modules are connected to the second wavelength division multiplexer in a one-to-one correspondence. The transmitting wavelength of the first optical module is equal to the receiving wavelength of the second optical module, and the receiving wavelength of the first optical module is equal to the transmitting wavelength of the second optical module.

10. The optical cross-connect network according to claim 9, characterized in that, The optical cross-connect network includes at least one first wavelength division multiplexing device, wherein at least two first wavelength division multiplexers are integrated in the first wavelength division multiplexing device; And / or, the optical cross-connect network includes at least one second wavelength division multiplexing device, wherein at least two second wavelength division multiplexers are integrated in the second wavelength division multiplexing device.

11. The optical cross-connect network according to claim 9, characterized in that, The optical cross-connect network includes a first wavelength division multiplexing device, which integrates all the first wavelength division multiplexers. And / or, the optical cross-connect network includes a second wavelength division multiplexing device, in which all the second wavelength division multiplexers are integrated.

12. The optical cross-connect network according to claim 10 or 11, characterized in that, In the first wavelength division multiplexing device, all the red and blue band filters of the first wavelength division multiplexer are integrated into a single structure; And / or, in the second wavelength division multiplexing device, the red and blue band filters of all the second wavelength division multiplexers are integrated into a single structure.

13. The optical cross-connect network according to any one of claims 8 to 11, characterized in that, The wavelength division multiplexer further includes a first coupling lens and a second coupling lens, with the input port and the output port located on one side of the first coupling lens, and the red-blue band filter located on the other side of the first coupling lens; the second coupling lens is disposed between the input / output port and the red-blue band filter; The first coupling lens is used to couple the optical signal output from the red-blue band filter to the output port, and to couple the optical signal output from the input port to the red-blue band filter; the second coupling lens is used for the optical signal between the input / output port and the red-blue band filter.

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