Wavelength selective switch apparatus and optical network device

Abstract

Provided in the present application are a wavelength selective switch apparatus and an optical network device. The wavelength selective switch apparatus comprises: a first optical transmission array, which has at least two input ports of a first wavelength selective switch and at least two input ports of a second wavelength selective switch; a beam splitting element, which is configured to separate first optical signals and second optical signals in a dispersion direction, and perform dispersion decomposition on each optical signal in the dispersion direction, so as to obtain a plurality of optical sub-signals of different wavelengths; a first spatial light modulator, which is configured to receive the plurality of optical sub-signals of different wavelengths corresponding to each input port, and adjust the light propagation direction of the optical sub-signals, wherein the beam splitting element is further configured to combine the plurality of optical sub-signals corresponding to each input port into a third optical signal, and guide and transmit the third optical signal to a corresponding output port; and a second optical transmission array, which has two columns of output ports, wherein one column of output ports is output ports of the first wavelength selective switch, and the other column of output ports is output ports of the second wavelength selective switch.

Description

Wavelength selective switching devices and optical network devices

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202510126726.8, filed on January 27, 2025, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] This application relates to the field of optical fiber communication technology, and in particular to a wavelength selective switching device and an optical network device. Background Technology

[0004] In recent years, with the rise of short videos, cloud computing, and large language models of artificial intelligence (LLM AI), data traffic in the network is experiencing exponential growth, and the demand for service wavelength add-drop on / off of ROADM (Reconfigurable Optical Add-Drop Multiplexer) nodes is constantly increasing.

[0005] Wavelength Selective Switch (WSS), as the core component of ROADM nodes, can dynamically manipulate optical signals in the spectral domain and space, significantly improving the intelligence, flexibility and reliability of the network, and is the key to realizing all-optical intelligent networks.

[0006] In some related technologies, ROADM nodes need to implement wavelength uplink and downlink simultaneously. Therefore, the required uplink / downlink WSS is a Twin structure, meaning one WSS device contains two WSSs: WSS1 for wavelength uplink and WSS2 for wavelength downlink. For an M×N WSS with a Twin structure, the input or output optical paths of the two WSSs are independently configured. This leads to the following problems: increased device size, increased debugging complexity and time, and consequently, increased cost of the M×N WSS with a Twin structure, hindering its large-scale deployment in ROADM nodes. Summary of the Invention

[0007] This application provides a wavelength selective switching device and an optical network device.

[0008] This application provides a wavelength selective switching device, comprising: a first optical transmission array having a plurality of input ports arranged along a switching direction, the plurality of input ports including at least two input ports of a first wavelength selective switch and at least two input ports of a second wavelength selective switch; and a beam splitting element configured to separate a first optical signal from the input port of the first wavelength selective switch and a second optical signal from the input port of the second wavelength selective switch in a dispersion direction, and to dissipate and decompose the optical signal corresponding to each input port into a plurality of sub-optical signals of different wavelengths in the dispersion direction, wherein the switching direction is perpendicular to the dispersion direction; wherein the plurality of sub-optical signals of different wavelengths corresponding to the first optical signal and the plurality of sub-optical signals of different wavelengths corresponding to the second optical signal are respectively transmitted to a first spatial light source. The modulator has different corresponding regions; a first spatial light modulator is configured to receive multiple sub-optical signals of different wavelengths corresponding to the input port, and adjust the light propagation direction of the sub-optical signals to guide the sub-optical signals to the beam splitting element; a second optical transmission array has multiple output ports arranged along the switching direction, the multiple output ports are configured as two columns of output ports, each column of output ports including at least two output ports, wherein one column of output ports is the output port of the first wavelength selection switch, and the other column of output ports is the output port of the second wavelength selection switch; wherein the beam splitting element is further configured to combine the multiple sub-optical signals of different wavelengths emitted from the first spatial light modulator into a third optical signal, and guide the third optical signal to the corresponding output port in the second optical transmission array.

[0009] This application also provides an optical network device, including the wavelength selective switching device provided in this application.

[0010] Further details regarding the above embodiments and other aspects of this application, as well as their implementations, are provided in the accompanying drawings, detailed description, and claims. Attached Figure Description

[0011] In the accompanying drawings of the embodiments of this application:

[0012] Figure 1 shows a schematic diagram of the architecture of a ROADM node in the related technology.

[0013] Figure 2 shows a schematic diagram of the light spot on the LCOS in a 1×N WSS in the related technology.

[0014] Figure 3 shows a schematic diagram of the architecture of a CDC-ROADM node in the related technology.

[0015] Figure 4 shows a schematic diagram of the light spot on the LCOS in an M×N WSS in the related technology.

[0016] Figure 5 shows a schematic diagram of the composition structure of a wavelength selective switching device provided in an embodiment of this application.

[0017] Figure 6 shows a schematic diagram of the composition structure of a first optical transmission array provided in an embodiment of this application.

[0018] Figure 7 shows a schematic diagram of the composition structure of a beam splitting element provided in an embodiment of this application.

[0019] Figure 8 shows a schematic diagram of the composition structure of a discrete element provided in an embodiment of this application.

[0020] Figure 9 shows a schematic diagram of the composition structure of an optical path guiding element provided in an embodiment of this application.

[0021] Figure 10 shows a schematic diagram of the composition structure of a dispersive element provided in an embodiment of this application.

[0022] Figure 11 shows a schematic diagram of the composition structure of a first spatial light modulator provided in an embodiment of this application.

[0023] Figure 12 shows a schematic diagram of the composition structure of another wavelength selective switching device provided in an embodiment of this application.

[0024] Figure 13 shows a schematic diagram of the composition structure of a second spatial light modulator provided in an embodiment of this application.

[0025] Figure 14 shows a schematic diagram of the composition structure of a second optical transmission array provided in an embodiment of this application.

[0026] Figure 15 shows a schematic diagram of the wavelength switching principle of a wavelength selective switching device in the switching direction according to an embodiment of this application.

[0027] Figure 16 shows a schematic diagram of the principle of a second wavelength selection switch in the dispersion direction provided in an embodiment of this application.

[0028] Figure 17 shows a schematic diagram of the principle of a first wavelength selection switch in the dispersion direction provided in an embodiment of this application. Detailed Implementation

[0029] To enable those skilled in the art to better understand the technical solutions of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0030] The present application will be described more fully below with reference to the accompanying drawings; however, the embodiments shown may be embodied in different forms, and the present application should not be construed as limited to the embodiments set forth below. Rather, these embodiments are provided so that this application will be thorough and complete, and will enable those skilled in the art to fully understand the scope of the application.

[0031] The accompanying drawings of the embodiments of this application are used to provide a further understanding of the embodiments of this application and constitute a part of the specification. They are used together with the detailed embodiments to explain this application and do not constitute a limitation thereof. The above and other features and advantages will become more apparent to those skilled in the art from the description of the detailed embodiments with reference to the accompanying drawings.

[0032] This application can be described with reference to plan views and / or cross-sectional views using the ideal schematic diagram of this application. Therefore, the example illustrations can be modified according to manufacturing techniques and / or tolerances.

[0033] Where there is no conflict, the various embodiments of this application and the features thereof may be combined with each other.

[0034] The terminology used in this application is for describing specific embodiments only and is not intended to limit the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated enumerated entries. The singular forms "a" and "the" as used herein are also intended to include the plural forms unless the context clearly indicates otherwise. The terms "comprising," "made of," etc., as used herein, specify the presence of the stated feature, integral, step, operation, element, and / or component, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof.

[0035] Unless otherwise specified, all terms used in this application (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and this application, and will not be interpreted as having an idealized or overly formal meaning, unless expressly so defined in this application.

[0036] In some related technologies, ROADM nodes implement wavelength uplink / downlink based on 1×N WSS back-to-back connections, as shown in Figure 1. Optionally, taking a 4×4 dimension on the line side as an example, the line side requires eight 1×5 WSS networks (MESH) interconnected; the downlink side requires two 1×4 WSS (or one 1×4 WSS and one 4×1 WSS) back-to-back connections to achieve downlink wavelength scheduling, followed by four 1-to-16 Sp (Splitter) downlinks (optionally, additional identical components are required to achieve 1:1 protection on the downlink side); the uplink side requires four 1-to-16 Cp (Coupler) uplinks, followed by two 1×4 WSS back-to-back connections to achieve uplink wavelength scheduling (optionally, additional identical components are required to achieve 1:1 protection on the uplink side). Because it's based on a 1×N WSS interconnect, the design dictates that after the optical signals from all ports are dispersed by the grating, only one row of light spots exists on the liquid crystal on silicon (LCOS). Therefore, it can only process 120 wavelengths (λ) in one band. These 120 wavelengths are arranged sequentially on the LCOS, and each wavelength can only cover a defined area, as shown in Figure 2. Optionally, the WSS can process the C-band, L-band, S-band, C+L-band, etc. Therefore, if wavelengths of the same frequency exist simultaneously in adjacent waves, the aforementioned ROADM node cannot process them, i.e., wavelength contention exists.

[0037] In some related technologies, the CDC-ROADM (Colorless, Directionless, Contentionless Reconfigurable Optical Add-Drop Multiplexer) node architecture is shown in Figure 3. In this architecture, the M×N WSS has multiple COM ports (Common Optical Ports). M optical signals are transmitted and transformed by the optical system, covering M rows of light spots on the LCOS, while simultaneously covering areas with M wavelengths of the same frequency, as shown in Figure 4. Therefore, it can simultaneously process M wavelengths of the same frequency, achieving wavelength-unobstructed (contentionless) add-drop. Optionally, as shown in Figure 3, taking a 4×4 dimension on the line side as an example, the add-drop side uses a Twin structure of 4×16 WSS for add-drop, and this ROADM node can simultaneously process 4 wavelengths of the same frequency. Optionally, using a Twin structure of 8×24 WSS for add-drop, this ROADM node can simultaneously process 8 wavelengths of the same frequency. Here, only to illustrate the architecture of the ROADM node in related technologies, the numbers M and N are not specifically limited.

[0038] As mentioned above, ROADM sites need to implement wavelength uplink and downlink simultaneously. Therefore, the required uplink / downlink WSS is a Twin structure, meaning one WSS device contains two WSSs: WSS1 for wavelength uplink and WSS2 for wavelength downlink. In related technologies, the input / output optical paths of the two WSSs in the Twin structure M×N WSS are independent. This leads to the following problems: increased device size, increased debugging complexity and time, and consequently, increased cost of the Twin structure M×N WSS, affecting its large-scale deployment in ROADM nodes.

[0039] This application provides a wavelength selective switching device and an optical network device, which aim to effectively improve the technical problems existing in the above-mentioned related technologies.

[0040] Please refer to Figure 5, which shows a schematic diagram of the composition structure of a wavelength selective switching device provided in an embodiment of this application. The embodiment of this application provides a wavelength selective switching device 100, which includes, but is not limited to: a first optical transmission array 101, a beam splitting element 102, a first spatial light modulator (SLM) 103, and a second optical transmission array 104.

[0041] The first optical transmission array 101 has a plurality of input ports in arranged along the switching direction x, the plurality of input ports in including at least two input ports (in11 to in1M) of the first wavelength selection switch and at least two input ports (in21 to in2M) of the second wavelength selection switch.

[0042] The beam splitter 102 is configured to separate the first optical signal from the input port (in11~in1M) of the first wavelength selection switch and the second optical signal from the input port (in21~in2M) of the second wavelength selection switch in the dispersion direction y, and to perform dispersion decomposition on the optical signal corresponding to each input port in the dispersion direction y into multiple sub-optical signals of different wavelengths, with the switching direction x perpendicular to the dispersion direction y; wherein, the multiple sub-optical signals of different wavelengths corresponding to the first optical signal and the multiple sub-optical signals of different wavelengths corresponding to the second optical signal are respectively transmitted to different regions on the first spatial light modulator 103.

[0043] The first spatial light modulator 103 is configured to receive multiple sub-light signals of different wavelengths corresponding to the input port in, and adjust the light propagation direction of the sub-light signals to guide the sub-light signals to the beam splitter 102.

[0044] The beam splitter 102 is also configured to combine multiple sub-optical signals of different wavelengths corresponding to the input port in emitted from the first spatial light modulator 103 into a third optical signal, and guide the third optical signal to the corresponding output port out in the second optical transmission array 104.

[0045] The second optical transmission array 104 has multiple output ports out arranged along the switching direction x. The multiple output ports out are configured as two columns of output ports, each column of output ports including at least two output ports, wherein one column of output ports (out11 to out1N) is the output port of the first wavelength selection switch, and the other column of output ports (out21 to out2N) is the output port of the second wavelength selection switch.

[0046] In this embodiment, the first optical transmission array 101 / second optical transmission array 104, beam splitting element 102, and first spatial light modulator 103 are arranged sequentially along the optical axis direction z, and the optical axis direction z is perpendicular to the switching direction x and the dispersion direction y.

[0047] In this embodiment, the switching direction is defined as the arrangement direction of the input ports, corresponding to the x-axis direction in the figure; the dispersion direction is defined as the direction in which the dispersed light signal unfolds, corresponding to the y-axis direction in the figure; and the optical axis direction is defined as the arrangement direction of the first optical transmission array 101 / second optical transmission array 104, the beam splitting element 102, and the first spatial light modulator 103, corresponding to the z-axis direction in the figure.

[0048] In this embodiment, the wavelength selective switch device 100 is a Twin-structure wavelength selective switch (WSS), applicable to add-drop wavelength selective switches (ADWSS), used to implement wavelength add-drop in optical network devices (such as ROADM nodes and optical cross-connectors OXC). The wavelength selective switch device 100 includes a first wavelength selective switch and a second wavelength selective switch, both of which are M×NWSS, where M and N are greater than or equal to 2 and are integers. The first wavelength selective switch has at least two input ports (in11 to in1M) and at least two output ports (out11 to out1N), and the second wavelength selective switch has at least two input ports (in21 to in2M) and at least two output ports (out21 to out2N).

[0049] At least two input ports (in11 to in1M) of the first wavelength selection switch and at least two input ports (in21 to in2M) of the second wavelength selection switch are integrated into a first optical transmission array 101. In the first optical transmission array 101, at least two input ports (in11 to in1M) of the first wavelength selection switch and at least two input ports (in21 to in2M) of the second wavelength selection switch are arranged sequentially at intervals along the switching direction x. In some embodiments, as shown in FIG5, in the switching direction x, at least two input ports (in11 to in1M) of the first wavelength selection switch are arranged sequentially above the optical axis, and at least two input ports (in21 to in2M) of the second wavelength selection switch are arranged sequentially below the optical axis.

[0050] At least two output ports (out11 to out1N) of the first wavelength selection switch and at least two output ports (out21 to out2N) of the second wavelength selection switch are integrated into a second optical transmission array 104. The second optical transmission array 104 is a two-dimensional array with two columns of output ports. The at least two output ports (out11 to out1N) of the first wavelength selection switch are arranged in a column of output ports at intervals along the switching direction x, and the at least two output ports (out21 to out2N) of the second wavelength selection switch are arranged in a column of output ports at intervals along the switching direction x. In some embodiments, as shown in FIG5, the output ports of the first wavelength selection switch and the output ports of the second wavelength selection switch are alternately arranged in the switching direction x.

[0051] In this embodiment of the application, the input port in of the first optical transmission array 101 is used to receive / transmit the corresponding optical signal, and the output port out of the second optical transmission array 101 is used to receive / transmit the corresponding optical signal.

[0052] In this embodiment, the first wavelength selection switch and the second wavelength selection switch multiplex the beam splitter 102 and the first spatial light modulator 103. The beam splitter 102 separates the first optical signal from the input port of the first wavelength selection switch and the second optical signal from the input port of the second wavelength selection switch in the dispersion direction. The optical signal of each input port is dispersed and decomposed into multiple sub-optical signals of different wavelengths in the dispersion direction y. These sub-optical signals are then transmitted along the optical axis z to different regions on the first spatial light modulator 103. After phase modulation by the first spatial light modulator 103, the sub-optical signals corresponding to each input port are switched. The switched sub-optical signals can propagate to the beam splitter 102 along a set angle. The multiple sub-optical signals of different wavelengths corresponding to each input port are converged and combined in the beam splitter 102 to form a third optical signal containing multiple wavelengths. The third optical signal is guided by the beam splitter 102 to the corresponding output port out in the second optical transmission array 101.

[0053] Thus, the wavelength selective switch device 100 provided according to the embodiments of this application can separate the optical signals of the two wavelength selective switches in the dispersion direction through the beam splitting element 102, and switch them through the first spatial light modulator 103. This allows the first wavelength selective switch and the second wavelength selective switch to realize a Twin structure in space, and enables the two wavelength selective switches to reuse the input / output optical path, saving the space of one input / output optical path and the cost of one input / output optical path component. Furthermore, during the adjustment and testing, only one wavelength selective switch needs to be aligned, and the other wavelength selective switch can be automatically aligned. This effectively improves the problem of complex and time-consuming adjustment and testing of the Twin structure wavelength selective switch in the related technology, and is conducive to the large-scale deployment of the Twin structure wavelength selective switch in ROADM nodes.

[0054] Figure 6 shows a schematic diagram of the composition structure of a first optical transmission array provided in an embodiment of this application. In some embodiments, as shown in Figure 6, the first optical transmission array 101 includes a first optical fiber array 101A and a first microlens array 101B, which are packaged in the same device. The first optical fiber array 101A includes optical fibers that are arranged one-to-one with the input ports (in11~in1M, in21~in2M), and each optical fiber can be connected to a corresponding light source. The light source inputs a corresponding optical signal through the corresponding optical fiber. The first microlens array 101B includes microlens units 101B1 that are arranged one-to-one with the optical fibers. The microlens units 101B1 are configured to perform spot transformation on the optical signal output through the corresponding optical fiber and then output it to the beam splitter element 102.

[0055] Figure 7 shows a schematic diagram of the composition structure of a beam splitting element provided in an embodiment of this application. In some embodiments, as shown in Figure 7, the beam splitting element 102 includes a splitting element 102A, an optical path guiding element 102B, and a dispersive element 102C arranged sequentially along the optical axis. The splitting element 102A is configured to separate a first optical signal from the input port (in11~in1M) of a first wavelength selection switch and a second optical signal from the input port (in21~in2M) of a second wavelength selection switch in the dispersion direction y. The first and second optical signals separated in the dispersion direction y are transmitted along the optical axis direction z to the optical path guiding element 102B. The optical path guiding element 102B is configured to guide the optical signal corresponding to each input port to be incident on the dispersive element 102C along the optical axis direction. The dispersive element 102C is configured to dissipate and decompose the optical signal corresponding to each input port in into different wavelengths in the dispersion direction y. Multiple sub-optical signals of different wavelengths are generated, and the multiple sub-optical signals of different wavelengths corresponding to the first optical signal and the multiple sub-optical signals of different wavelengths corresponding to the second optical signal are transmitted along the optical axis z to the corresponding different regions on the first spatial light modulator 103; the dispersive element 102C is also configured to combine the multiple sub-optical signals of different wavelengths corresponding to the input port emitted from the first spatial light modulator 103 into a third optical signal, and guide the third optical signal to the optical path guiding element 102B; the optical path guiding element 102B is also configured to guide the third optical signal to be transmitted through the separation element 102A to the corresponding output port out in the second optical transmission array 104.

[0056] Figure 8 shows a schematic diagram of the composition structure of a separation element provided in an embodiment of this application. In some embodiments, as shown in Figure 8, the separation element 102A includes a first transformation unit, which includes a first part 102A1 and a second part 102A2 arranged sequentially along the switching direction x. That is, the first transformation unit is divided into upper and lower parts in space along the yoz plane where the optical axis is located, with the upper part being the first part 102A1 and the lower part being the second part 102A2.

[0057] One of the first part 102A1 and the second part 102A2 is set to the input port (in11~in1M) of the first wavelength selection switch, and the other is set to the input port (in21~in2M) of the second wavelength selection switch; one of the first part 102A1 and the second part 102A2 is used to deflect the light propagation direction of the corresponding incident light signal along the dispersion direction y, and the other is used to transmit the corresponding incident light signal.

[0058] In some embodiments, the first part 102A1 is configured to correspond to the input port (in11 to in1M) of the first wavelength selection switch, and the second part 102A2 is configured to correspond to the input port (in21 to in2M) of the second wavelength selection switch. The first optical signal emitted from the input port (in11~in1M) of the first wavelength selection switch is incident along the optical axis onto the first part 102A1 of the separation element 102A. The first part 102A1 deflects the light propagation direction of the first optical signal from the input port (in21~in2M) of the first wavelength selection switch along the dispersion direction y. The first optical signal emitted from the first part 102A1 is transmitted along the optical axis to the optical path guiding element 102B. The second optical signal emitted from the input port (in21~in2M) of the second wavelength selection switch is incident along the optical axis onto the second part 102A2 of the separation element 102A. The second part 102A2 transmits the second optical signal from the input port of the second wavelength selection switch. The second optical signal emitted from the second part 102A2 is transmitted along the optical axis to the optical path guiding element 102B.

[0059] Regarding the configuration of the first part 102A1 corresponding to the input port (in21~in2M) of the second wavelength selection switch, and the configuration of the second part 102A2 corresponding to the input port (in11~in1M) of the first wavelength selection switch, please refer to the above description of the configuration of the first part 102A1 corresponding to the input port (in11~in1M) of the first wavelength selection switch, and the configuration of the second part 102A2 corresponding to the input port (in21~in2M) of the second wavelength selection switch. It will not be repeated here.

[0060] In some embodiments, in the first transformation unit, the first part 102A1 is an optical wedge and the second part 102A2 is a glass plate; or, the first part 102A1 is a glass plate and the second part 102A2 is an optical wedge.

[0061] It should be noted that the embodiments of this application do not impose special restrictions on the specific implementation of the first conversion unit. Any component that can be used to separate the optical signals of the input ports of the two wavelength selection switches in the dispersion direction y is within the protection scope of the embodiments of this application.

[0062] Figure 9 shows a schematic diagram of the composition structure of an optical path guiding element provided in an embodiment of this application. In some embodiments, as shown in Figure 9, in the beam splitting element 102, the optical path guiding element 102B includes the following components arranged sequentially along the optical axis z: a first transformation lens 102B1, a second transformation unit 102B2, a second transformation lens 102B3, a third transformation unit 102B4, and a third transformation lens 102B5.

[0063] The first conversion lens 102B1 is used to adjust the light propagation direction of the optical signal from the separation element 102A, so that the optical signal emitted from the first conversion lens 102B1 is focused on the middle region of the second conversion unit 102B2; the second conversion unit 102B2 is used to adjust the light propagation direction of the incident optical signal, so that the optical signal emitted from the second conversion unit 102B2 is transmitted to the second conversion lens 102B3 along the incident direction; the second conversion lens 102B3 is used to adjust the light propagation direction of the incident optical signal, so that the optical signal emitted from the second conversion lens 102B3 is transmitted to the third conversion unit 102B4 along the optical axis direction z; the third conversion... Unit 102B4 includes a third part 102B4-1 and a fourth part 102B4-2 arranged sequentially along the switching direction x; one of the third part 102B4-1 and the fourth part 102B4-2 is used to deflect the light propagation direction of the corresponding incident light signal along the dispersion direction y and transmit it to the third conversion lens 102B5, and the other part is used to transmit the corresponding incident light signal to the third conversion lens 102B5; the third conversion lens 102B5 is used to perform spot transformation on the light signal deflected along the dispersion direction y and then transmit it to the dispersion element 102C, and to transmit the light signal that is not deflected along the dispersion direction y and then transmit it to the dispersion element 102C.

[0064] In some embodiments, the lens surface of the first transforming lens 102B1 includes, but is not limited to, a spherical surface, for realizing the transformation of the exit position / angle of the incident light signal.

[0065] In some embodiments, the second conversion unit 102B2 may be a multifunctional reflector with reflection / transmission selectivity, used to select the incident light signal so that the middle region reflects and the edge region transmits. In some embodiments, the second conversion unit 102B2 includes an upper region, a middle region, and a lower region arranged sequentially along the switching direction; wherein the upper region includes a first transmission component, the middle region includes a reflection component, and the lower region includes a second transmission component; or, the upper region includes a first reflection component, the middle region includes a transmission component, and the lower region includes a second reflection component.

[0066] In some embodiments, the lens surface of the second transforming lens 102B3 includes, but is not limited to, a spherical surface, for realizing the transformation of the exit position / angle of the incident light signal.

[0067] In some embodiments, when the first part 102A1 of the separation element 102A is used to deflect the light propagation direction of the incident light signal in the dispersion direction y, the third part 102B4-1 of the third conversion unit 102B4 is used to transmit the corresponding incident light signal; when the first part 102A1 of the separation element 102A is used to transmit the corresponding incident light signal, the third part 102B4-1 of the third conversion unit 102B4 is used to deflect the light propagation direction of the incident light signal in the dispersion direction y.

[0068] In some embodiments, in the third conversion unit 102B4, the third part 102B4-1 is a glass plate, and the fourth part 102B4-2 is an optical wedge; or, the third part 102B4-1 is an optical wedge, and the fourth part 102B4-2 is a glass plate. This achieves the deflection of a portion of the incident light signal in the dispersion direction y, while the other portion of the light signal is directly transmitted, thus separating the different light signals in the dispersion direction y.

[0069] In some embodiments, the lens surface of the third transforming lens 102B5 includes, but is not limited to, a cylindrical surface disposed along the dispersion direction y, for realizing spot transformation of the incident light signal in the dispersion direction y.

[0070] In some embodiments, in the direction of optical signal transmission from input port in to the first spatial light modulator 103, the first optical signal from the input port (in11~in1M) of the first wavelength selection switch and the second optical signal from the input port (in21~in2M) of the second wavelength selection switch are transmitted along the optical axis direction z to the separation element 102A. Under the action of the separation element 102A, the first optical signal and the second optical signal are separated in the dispersion direction y. After separation, they are emitted from the separation element 102A and transmitted along the optical axis direction z to the optical path guiding element 102B. In the optical path guiding element 102B, after position / angle transformation and adjustment by the first transformation lens 102B1, they are focused into the middle region of the second transformation unit 102B2. After position / angle transformation and adjustment by the second transformation unit 102B2, they are transmitted along the direction of incident on the second transformation unit 102B2 to the second transformation lens 102B3. After position / angle transformation and adjustment by the second transformation lens 102B3, they are transmitted along the optical axis direction z to the third transformation unit 102B4. The first optical signal is transmitted to the third part 102B4-1 of the third conversion unit 102B4, and the second optical signal is transmitted to the fourth part 102B4-2 of the third conversion unit; alternatively, the first optical signal is transmitted to the fourth part 102B4-2 of the third conversion unit 102B4, and the second optical signal is transmitted to the third part 102B4-1 of the third conversion unit. The third part 102B4-1 transmits the incident optical signal, and the fourth part 102B4-2 deflects the light propagation direction of the incident optical signal along the dispersion direction y before emitting it; alternatively, the third part 102B4-1 deflects the light propagation direction of the incident optical signal along the dispersion direction y before emitting it, and the fourth part 102B4-2 transmits the incident optical signal. Then, the optical signal emitted from the third conversion unit 102B4 is transmitted through the third conversion lens 102B5 and then transmitted along the optical axis z to the dispersive element 102C.

[0071] In some embodiments, in the direction of optical signal transmission from the first spatial light modulator 103 to the output port out, the first spatial light modulator 103 performs angle switching on multiple sub-optical signals of different wavelengths corresponding to each input port in, and then incident on the dispersive element 102C at a set angle. Under the action of the dispersive element 102C, the multiple sub-optical signals of different wavelengths corresponding to each input port in converge and combine into the corresponding third optical signal. The third optical signal is guided and transmitted to the optical path guiding element 102B via the dispersive element 102C. In the optical path guiding element 102B, the third optical signal is guided and transmitted to the corresponding output port out in the second optical transmission array 104 after being adjusted or transmitted through the units and lenses in the optical path guiding element 102B by angle transformation.

[0072] Figure 10 shows a schematic diagram of the composition structure of a dispersive element provided in an embodiment of this application. In some embodiments, as shown in Figure 10, the dispersive element 102C includes a fourth transformation lens 102C1, a grating 102C2 and a fifth transformation lens 102C3 arranged sequentially along the optical axis z.

[0073] The fourth conversion lens 102C1 is used to adjust the light propagation direction of the incident light signal so that the light signal emitted from the fourth conversion lens 102C1 is focused onto the grating 102C2; the grating 102C2 is used to dissipate and decompose the light signal from each input port into multiple sub-light signals of different wavelengths in the dispersion direction y, and transmit them to the fifth conversion lens 102C3; the fifth conversion lens 102C3 is used to adjust the light propagation direction of the incident sub-light signals so that the sub-light signals emitted from the fifth conversion lens 102C3 are transmitted along the optical axis direction z to the corresponding area on the first spatial light modulator 103.

[0074] In some embodiments, the grating 102C2 includes, but is not limited to, a prism grating or a blazed grating, for the purpose of decomposing and synthesizing optical signals.

[0075] It is understood that in the optical paths of the first wavelength selection switch and the second wavelength selection switch, the embodiments of this application adopt a folded optical path method, so that the optical path of the wavelength selection switch repeatedly passes through the grating 102C2 of the dispersive element 102C twice, and the same grating 102C2 is reused twice.

[0076] Taking one input port of the first wavelength selection switch as an example, the first optical signal emitted from the input port of the first wavelength selection switch is deflected along the dispersion direction y by the separation element 102A, and then guided to the dispersion element 102C by the optical path guiding element 102B. In the dispersion element 102C, the angle of the fourth transformation lens 102C1 is adjusted and focused on the grating 102C2. The grating 102C2 disperses and decomposes the optical signal into multiple sub-light signals of different wavelengths. Then, the angle of the fifth transformation lens 102C3 is adjusted and the signal propagates along the optical axis z to the corresponding area on the first spatial light modulator 103. During this process, the optical signal passes through the grating 102C2 of the dispersion element 102C for the first time.

[0077] The sub-light signals of different wavelengths corresponding to the input port of the first wavelength selection switch are switched at an angle by the first spatial light modulator 103 and then incident at a set angle into the dispersive element 102C. After being adjusted by the angle transformation of the fifth transformation lens 102C3 in the dispersive element 102C, they are transmitted to the grating 102C2. Under the action of the grating 102C2, the sub-light signals of different wavelengths corresponding to the input port converge and combine into a third light signal containing multiple wavelengths. After the third light signal is emitted from the grating 102C2, it is adjusted by the angle transformation of the fourth transformation lens 102C1 and transmitted to the optical path guiding element 102B. During this process, the light signal passes through the grating 102C2 of the dispersive element 102C for the second time, and the grating 102C2 passed through for the first time and the grating 102C2 passed through for the second time are the same grating.

[0078] In some embodiments, the lens surface of the fourth transforming lens 102C1 includes, but is not limited to, a spherical surface, for realizing the transformation of the exit position / angle of the incident light signal.

[0079] In some embodiments, the lens surface of the fifth transforming lens 102C3 includes, but is not limited to, a spherical surface, for realizing the transformation of the exit position / angle of the incident light signal.

[0080] In some embodiments, other compensation elements may be provided before and after the fourth transformation lens 102C1 or the fifth transformation lens 102C3 along the optical axis z. These other compensation elements may be optical wedges without optical power, polarization conversion elements, or other lenses with optical power, and their surface shape is not limited to a spherical surface. It is understood that in the optical paths of the first wavelength selection switch and the second wavelength selection switch, the embodiments of this application employ a folded optical path method, causing the optical path of the wavelength selection switch to repeatedly pass through the fourth transformation lens 102C1 and the fifth transformation lens 102C3 several times, and the fourth transformation lens 102C1 and the fifth transformation lens 102C3 are multiplexed lenses or lens groups.

[0081] It should be noted that the embodiments of this application do not impose special restrictions on the specific implementation of various components in the beam splitting element 102, as long as the required optical function can be achieved.

[0082] Figure 11 shows a schematic diagram of the composition structure of a first spatial light modulator provided in an embodiment of this application. In some embodiments, as shown in Figure 11, the first spatial light modulator 103 includes a first region 103A and a second region 103B divided along the switching direction x, that is, the first spatial light modulator 103 is divided into upper and lower regions along the yoz plane in space, the upper region is the first region 103A, and the lower region is the second region 103B.

[0083] The first region 103A is configured to receive multiple sub-optical signals of different wavelengths corresponding to the first optical signal, and to adjust the light propagation direction of the received sub-optical signals; the second region 103B is configured to receive multiple sub-optical signals of different wavelengths corresponding to the second optical signal, and to adjust the light propagation direction of the received sub-optical signals.

[0084] In some embodiments, as shown in FIG11, the first region 103A includes multiple rows of first sub-regions 103A1 arranged sequentially along the switching direction x, the number of rows of the first sub-regions 103A1 being equal to the number of input ports (in11 to in1M) of the corresponding first wavelength selection switches; the second region 103B includes multiple rows of second sub-regions 103B1 arranged sequentially along the switching direction x, the number of rows of the second sub-regions 103B1 being equal to the number of input ports (in21 to in2M) of the corresponding second wavelength selection switches.

[0085] Among them, the multiple sub-optical signals corresponding to the first optical signal emitted from the beam splitting element 102 and the input port of the first wavelength selection switch are transmitted to a row of first sub-regions 103A1. Each row of first sub-regions 103A1 receives multiple sub-optical signals corresponding to the first optical signal from one input port of the first wavelength selection switch. The multiple sub-optical signals corresponding to the first optical signal from each input port of the first wavelength selection switch can form a light spot as shown in Figure 3 in the corresponding row of first sub-regions 103A1.

[0086] Multiple sub-optical signals corresponding to the second optical signal emitted from the beam splitter 102 and the input port of the second wavelength selection switch are transmitted to a row of second sub-regions 103B1. Each row of second sub-regions 103B1 receives multiple sub-optical signals corresponding to the second optical signal from one input port of the second wavelength selection switch. Multiple sub-optical signals corresponding to the first optical signal from each input port of the first wavelength selection switch can form a light spot as shown in Figure 3 in the corresponding row of second sub-regions 103B1.

[0087] In some embodiments, multiple sub-optical signals corresponding to the optical signal of each input port are emitted parallel to the optical axis via the fifth transformation lens 102C3 and incident perpendicularly onto the corresponding area on the first spatial light modulator to form a corresponding light spot.

[0088] In some embodiments, the first spatial light modulator 103 may be a PI-LCOS (Polarization Independence Liquid Crystal on Silicon), LCOS (Liquid Crystal on Silicon), or MEMS (Micro-Electro-Mechanical System) to deflect the light propagation direction of the optical signal.

[0089] Figure 12 shows a schematic diagram of the composition structure of another wavelength selective switching device provided in an embodiment of this application. In some embodiments, as shown in Figure 12, the wavelength selective switching device 100 may further include a second spatial light modulator (SLM) 105.

[0090] Multiple sub-optical signals of different wavelengths corresponding to each input port are transmitted to the beam splitter 102 after angle switching by the first spatial light modulator 103. The beam splitter 102 is also configured to combine the multiple sub-optical signals of different wavelengths corresponding to each input port output by the first spatial light modulator 103 into a third optical signal, and guide the third optical signal to the corresponding area on the second spatial light modulator 105. The second spatial light modulator 105 is configured to receive the third optical signal corresponding to each input port and adjust the light propagation direction of the third optical signal to transmit the third optical signal of the corresponding area on the second spatial light modulator 105 to the output port out corresponding to the second optical transmission array 104.

[0091] Figure 13 shows a schematic diagram of the composition structure of a second spatial light modulator provided in an embodiment of this application. In some embodiments, as shown in Figure 13, the second spatial light modulator 105 includes two columns of control regions 105A. Each column of control regions 105A includes at least two control regions 105A. One column of control regions 105A corresponds to the output port (out11~out1N) of a first wavelength selection switch. The control regions 105A in this column of control regions 105A are connected to the output port of the first wavelength selection switch in a one-to-one correspondence. The other column of control regions 105A corresponds to the output port (out21~out2N) of a second wavelength selection switch. The control regions 105A in this other column of control regions 105A are connected to the output port of the second wavelength selection switch in a one-to-one correspondence. Each control region 105A is used to adjust the light propagation direction of the received third optical signal and transmit the third optical signal to the corresponding output port.

[0092] In some embodiments, the second spatial light modulator 105 may be a PI-LCOS (Polarization Independence Liquid Crystal on Silicon), LCOS (Liquid Crystal on Silicon), or MEMS (Micro-Electro-Mechanical System) to deflect the light propagation direction of the optical signal.

[0093] Figure 14 shows a schematic diagram of the composition structure of a second optical transmission array provided in an embodiment of this application. In some embodiments, as shown in Figure 14, the second optical transmission array 104 is a two-dimensional array. The second optical transmission array 104 includes a second optical fiber array 104A and a second microlens array 104B. The second optical fiber array 104A and the second microlens array 104B are packaged in the same device. The second optical fiber array 104A includes optical fibers that are arranged one-to-one with the output ports (out11~out1N, out21~out2N). The second microlens array 104B includes microlens units 104B1 that are arranged one-to-one with the optical fibers. The microlens units 104B1 are configured to perform spot transformation on the third optical signal output by the second spatial light modulator 105 and transmit it to the corresponding output port.

[0094] In some embodiments, a polarization diversity unit and a polarization conversion unit may also be provided after the first microlens array 101B in the optical axis direction z.

[0095] In some embodiments, a polarization diversity unit and a polarization conversion unit may also be provided in the optical axis direction z, before the second microlens array 104B.

[0096] In this embodiment, the wavelength selection switch device 100 can be applied to ROADM and optical cross-connect (OXC), and can also be used to build higher-dimensional optical cross-connect nodes. It can be widely used in various scenarios such as backbone networks, metropolitan area networks, and access networks, and is suitable for C-band, L-band, C+L-band, S+C+L-band, etc.

[0097] Figure 15 illustrates a schematic diagram of the wavelength switching principle of a wavelength selective switching device according to an embodiment of this application. In some embodiments, as shown in Figure 15, the wavelength selective switching device includes two M×N wavelength selective switches (WSS) with a Twin structure. The dashed arrow indicates the optical path of the second wavelength selective switch (WSS), and the solid arrow indicates the optical path of the first wavelength selective switch (WSS). The switching direction is defined as the arrangement direction of the 2M input ports, corresponding to the x-axis direction in the figure. The upper half of Figure 15 shows the optical path of the optical signal input to the first spatial light modulator (LCOS) 103 via the first optical transmission array 101, and the lower half shows the optical path of the optical signal being switched by the first spatial light modulator 103 and then switched by the second spatial light modulator 105 before being output from the second optical transmission array 104.

[0098] The optical path can be divided into an input section and an output section. The input section can be further divided into an input optical path and a main optical path. The optical signal exiting from the input port of the first optical transmission array 101 and transmitted via the separating element 102A, the first conversion lens 102B1, the second conversion unit 102B2, the second conversion lens 102B3, the third conversion unit 102B4, and the third conversion lens 102B5 to the virtual surface L is the input optical path. The optical signal exiting from the virtual surface L and transmitted via the fourth conversion lens 102C1, the grating 102C2, and the fifth conversion lens 102C3 to the first spatial light modulator 103 is the main optical path of the input section. The virtual surface L can also be called a virtual plane, and the optical signal propagating to it in the input optical path is perpendicular to this virtual surface.

[0099] The output section can be divided into an output optical path and a main optical path. The optical signal emitted from the first spatial light modulator 103 and transmitted to the virtual surface L via the fifth conversion lens 102C3, the grating 102C2 and the fourth conversion lens 102C1 is the main optical path of the output section. The optical signal emitted from the virtual surface L and transmitted to the second optical transmission array 104 via the third conversion lens 102B5, the third conversion unit 102B4, the second conversion lens 102B3, the second conversion unit 102B2, the first conversion lens 102B1, the separation element 102A and the second spatial light modulator 105 is the output optical path of the output section.

[0100] Since the wavelength switching principles of the first wavelength selection switch WSS and the second wavelength selection switch WSS are exactly the same in the switching direction x, and their paths are also symmetrical about the optical axis, the switching principle will be explained below using the first wavelength selection switch WSS as an example. The switching principle of the second wavelength selection switch WSS is the same, and will not be repeated here.

[0101] M optical signals pass through the first fiber array 101A and the first microlens array 101B in the first optical transmission array 101, transforming the initial Gaussian beam with a small beam waist radius into a Gaussian beam with a larger beam waist radius, thus reducing the beam divergence angle. The transformation equation for the Gaussian beam is as follows:

[0102] Where ω1 and ω0 are the beam waist radii before and after Gaussian beam transformation, f is the equivalent focal length of the microlens unit, and λ is the wavelength of the Gaussian beam. In some embodiments, the beam waist radius can be transformed to 100 μm.

[0103] M optical signals emitted from different input ports pass through the separation element (first conversion unit) 102A and are then incident on the first conversion lens 102B1. After passing through the first conversion lens 102B1, they are focused on the middle region of the second conversion unit 102B2. The optical signal focused on the middle region of the second conversion unit 102B2 is reflected and propagated forward to the second conversion lens 102B3. The optical signal emitted from the second conversion lens 102B3 is parallel to the optical axis and propagates to the virtual surface L after passing through the third conversion unit 102B4 and the third conversion lens 102B5.

[0104] The optical signal passing through the virtual surface L is focused onto the grating 102C2 after passing through the fourth transformation lens 102C1. The grating 102C2 has a diffraction effect in the dispersion direction y, but no diffraction effect in the switching direction x. The optical signal passes through the fifth transformation lens 102C3, exits parallel to the optical axis, and is perpendicularly incident on the upper half region (first region) of the first spatial light modulator 103. The upper half region (first region) of the first spatial light modulator 103 is divided into M rows of first sub-regions. The optical signal emitted from each input port is dispersed by the grating 102C2 and decomposed into multiple sub-optical signals, which are then incident on the first sub-region of the corresponding row in the first region of the first spatial light modulator 103.

[0105] In some embodiments, the first spatial light modulator 103 is an LCOS.

[0106] In the upper half region (first region) of the first spatial light modulator 103, phase modulation is applied to the first sub-region where the light spot of the sub-light signal is located to achieve wavelength switching of each sub-light signal. After switching, the sub-light signal passes sequentially through the fifth conversion lens 102C3, grating 102C2, fourth conversion lens 102C1, virtual surface L, and third conversion unit 102B4, and is incident on the second conversion unit 102B2. After being transmitted through the second conversion unit 102B2, it is transmitted to the corresponding control region in the second spatial light modulator 105, as shown in the light spot in Figure 13. A voltage is applied to this control region to change the propagation angle of the light signal to be parallel to the optical axis. After being transformed by the second microlens array 104B in the second optical transmission array 104, it is coupled to the corresponding output port of the second fiber array 104A.

[0107] In some embodiments, the second spatial light modulator 105 is a MEMS, wherein the pitch of the MEMS mirror can be set to 330 μm.

[0108] In some embodiments, the optical power of the second microlens array 104B may be the same as or different from that of the first microlens array 101B.

[0109] It should be noted that, in the switching direction, in the output optical path, since some optical components do not play a role in the optical path, these optical components are not shown in the output optical path section of Figure 15.

[0110] Figure 16 shows a schematic diagram of the principle of a second wavelength selection switch in the dispersion direction provided in an embodiment of this application. In some embodiments, as shown in Figure 16, the second part 102A2 of the separation element (first conversion unit) 102A and the third part 102B4-1 of the third conversion unit 102B4 are glass plates used to compensate for optical path; 105.2 represents the second column control region of the second spatial light modulator 105, and 104.2 represents the second column of the second fiber array 104A and the second column of the second microlens array 104B in the second optical transmission array.

[0111] For the second wavelength selection switch, the light signals emitted from the M input ports always propagate along the optical axis z in the dispersion direction, sequentially passing through the first microlens array 101B, the second part 102A2 of the separation element (first conversion unit) 102A, the first conversion lens 102B1, the second conversion unit 102B2, the second conversion lens 102B3, the third part 102B4-1 of the third conversion unit 102B4, the third conversion lens 102B5, the virtual surface L, and the fourth conversion lens 102C1. After reaching the grating 102C2, diffraction occurs. The diffraction equation of the grating 102C2 is as follows: nΛ(sinθ) i ±sinθ d )=±mλ

[0112] Where n is the effective refractive index of the grating, Λ is the grating period, and θ i and θ d Here, θ represents the incident angle and the diffraction angle, respectively; m represents the diffraction order; and λ represents the diffraction wavelength. In some embodiments, the grating is a blazed grating, which has only +1 or -1 order diffraction orders.

[0113] After the incident light signal is incident on the grating 102C2, different sub-light signals diffract according to the diffraction equation. After being deflected at different angles, they pass through the fifth transform lens 102C3 and are perpendicularly incident on the corresponding region of the first spatial light modulator 103. In some embodiments, the first spatial light modulator 103 is an LCOS or a PI-LCOS, and its simplified diffraction equation is: dsinθ d =λ

[0114] Where d is the phase period of LCOS, θ d λ is the diffraction angle, and λ is the diffraction wavelength.

[0115] After being switched by the first spatial light modulator 103, different sub-light signals are propagated through the fifth conversion lens 102C3 to the grating 102C2 and combined into an optical signal containing multiple sub-light signal wavelengths. Finally, the signal passes sequentially along the optical axis through the fourth conversion lens 102C1, the virtual surface L, the third conversion lens 102B5, the third part 102B4-1 of the third conversion unit 102B4, the second conversion lens 102B3, and the second conversion unit 102B2 before being transmitted to the second column control area 105.2 of the second spatial light modulator 105. After being reflected by the second column control area of ​​the second spatial light modulator 105, the signal is coupled to the second column 104.2 of the second fiber array 104A in the second optical transmission array 104.

[0116] Figure 17 shows a schematic diagram of the principle of a first wavelength selection switch in the dispersion direction provided by an embodiment of this application. In some embodiments, as shown in Figure 17, the first part 102A1 of the separation element (first conversion unit) 102A and the fourth part 102B4-2 of the third conversion unit 102B4 are optical wedges used to deflect the incident light signal off the optical axis in the dispersion direction and then deflect it back to the optical axis; 105.1 represents the first column control area of ​​the second spatial light modulator 105, and 104.1 represents the first column of the second fiber array 104A and the first column of the second microlens array 104B in the second optical transmission array.

[0117] For the first wavelength selection switch, the optical signal emitted from the M input ports sequentially passes through the first microlens array 101B and the first part 102A1 of the separating element (first conversion unit) 102A, and its propagation direction deviates from the optical axis by a certain angle β. After passing through the first conversion lens 102B1, a beam of light parallel to the optical axis is emitted, offset from the optical axis by a certain distance h. Then, the optical signal sequentially passes through the second conversion unit 102B2 and the second conversion lens 102B3, and the emitted beam has an angle relative to the optical axis of β. The light beam passes through the fourth part 102B4-2 in the third transformation unit 102B4. After the outgoing light beam coincides with the optical axis, it passes through the third transformation lens 102B5, the virtual surface L, and the fourth transformation lens 102C1 in sequence. After reaching the grating 102C2, it undergoes diffraction. After passing through the fifth transformation lens 102C3, it is perpendicularly incident on the corresponding area of ​​the first spatial light modulator 103.

[0118] After being switched by the first spatial light modulator 103, the different sub-light signals propagate through the fifth transform lens 102C3 to the grating 102C2, where they are combined into an optical signal containing multiple sub-light signal wavelengths. Finally, the signal passes sequentially along the optical axis through the fourth transform lens 102C1, the virtual surface L, the third transform lens 102B5, and the fourth part 102B4-2 of the third transform unit 102B4, with the outgoing angle relative to the optical axis being [missing information]. The light beam, after passing through the second conversion lens 102B3, emits an optical signal parallel to the optical axis and offset from the optical axis by a distance h. After passing through the second conversion unit 102B2, it is transmitted to the first column control area 105.1 of the second spatial light modulator 105. After being reflected by the first column control area 105.1 of the second spatial light modulator 105, it is coupled to the first column 104.1 of the second fiber array 104A in the second optical transmission array 104.

[0119] This application also provides an optical network device, which includes the wavelength selective switching device described in any of the above embodiments.

[0120] In some embodiments, optical network devices include, but are not limited to, reconfigurable optical add-drop multiplexers (ROADMs) or optical cross connectors (OXCs) built based on the wavelength selective switching devices described above.

[0121] This application has disclosed exemplary embodiments, and although specific terminology has been used, it is used and should be interpreted only in a general illustrative sense and is not intended to be limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in conjunction with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in conjunction with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of this application as set forth by the appended claims.

Claims

1. A wavelength selective switching device, comprising: A first optical transmission array has a plurality of input ports arranged along the switching direction, the plurality of input ports including at least two input ports of a first wavelength selection switch and at least two input ports of a second wavelength selection switch; A beam splitter is configured to separate a first optical signal from the input port of the first wavelength selection switch and a second optical signal from the input port of the second wavelength selection switch in the dispersion direction, and to dissipate and decompose the optical signal corresponding to each input port into multiple sub-optical signals of different wavelengths in the dispersion direction, wherein the switching direction is perpendicular to the dispersion direction, and the multiple sub-optical signals of different wavelengths corresponding to the first optical signal and the multiple sub-optical signals of different wavelengths corresponding to the second optical signal are respectively transmitted to different regions on the first spatial light modulator. A first spatial light modulator is configured to receive multiple sub-optical signals of different wavelengths corresponding to the input port, and adjust the light propagation direction of the sub-optical signals to guide the sub-optical signals to the beam splitting element. The second optical transmission array has multiple output ports arranged along the switching direction. The multiple output ports are configured as two columns of output ports, each column of output ports including at least two output ports, wherein one column of output ports is the output port of the first wavelength selection switch, and the other column of output ports is the output port of the second wavelength selection switch. The beam splitting element is further configured to combine multiple sub-optical signals of different wavelengths corresponding to the input port output from the first spatial light modulator into a third optical signal, and guide the third optical signal to the corresponding output port in the second optical transmission array.

2. The wavelength selective switching device according to claim 1, wherein, The first optical transmission array includes a first optical fiber array and a first microlens array; The first fiber array includes optical fibers that are arranged one-to-one with the input ports, and the first microlens array includes microlens units that are arranged one-to-one with the optical fibers. The microlens units are configured to transform the light spot of the light signal output through the corresponding optical fiber and then output it to the beam splitting element.

3. The wavelength selective switching device according to claim 1, wherein, The beam splitting element includes a splitting element, an optical path guiding element, and a dispersing element arranged sequentially along the optical axis. The separating element is configured to separate a first optical signal from the input port of the first wavelength selection switch and a second optical signal from the input port of the second wavelength selection switch in a dispersion direction. The first optical signal and the second optical signal separated in the dispersion direction are transmitted to an optical path guiding element along an optical axis direction, wherein the optical axis direction is perpendicular to the switching direction and the dispersion direction. The optical path guiding element is configured to guide the optical signal corresponding to each input port to be incident on the dispersive element along the optical axis direction; The dispersive element is configured to dissipate and decompose the optical signal corresponding to each input port into multiple sub-optical signals of different wavelengths in the dispersive direction, and transmit the multiple sub-optical signals of different wavelengths corresponding to the first optical signal and the multiple sub-optical signals of different wavelengths corresponding to the second optical signal to different regions on the first spatial light modulator along the optical axis. The dispersive element is further configured to combine multiple sub-optical signals of different wavelengths corresponding to the input port emitted from the first spatial light modulator into a third optical signal, and guide the third optical signal to the optical path guiding element; The optical path guiding element is also configured to guide the third optical signal to be transmitted through the separation element to the corresponding output port in the second optical transmission array.

4. The wavelength selective switching device according to claim 3, wherein, The separation element includes a first conversion unit, which includes a first part and a second part arranged sequentially along the switching direction; one of the first part and the second part corresponds to the input port of the first wavelength selection switch, and the other part corresponds to the input port of the second wavelength selection switch. One of the first part and the second part is used to deflect the light propagation direction of the corresponding incident light signal along the dispersion direction, and the other part is used to transmit the corresponding incident light signal.

5. The wavelength selective switching device according to claim 4, wherein, The first part is an optical wedge, and the second part is a glass plate, or the first part is a glass plate and the second part is an optical wedge.

6. The wavelength selective switching device according to claim 3, wherein, The optical path guiding element comprises elements arranged sequentially along the optical axis: The first conversion lens is used to adjust the light propagation direction of the light signal from the separation element so that the light signal emitted from the first conversion lens is focused on the middle region of the second conversion unit. The second conversion unit is used to adjust the light propagation direction of the incident light signal so that the light signal emitted from the second conversion unit is transmitted to the second conversion lens along the incident direction; The second conversion lens is used to adjust the light propagation direction of the incident light signal so that the light signal emitted from the second conversion lens is transmitted to the third conversion unit along the optical axis direction. The third conversion unit includes a third part and a fourth part arranged sequentially along the switching direction; one of the third part and the fourth part is used to deflect the light propagation direction of the corresponding incident light signal along the dispersion direction and transmit it to the third conversion lens, and the other part is used to transmit the corresponding incident light signal to the third conversion lens. The third transforming lens is used to transform the light spot of the light signal deflected along the dispersion direction and to transmit the light signal that is not deflected along the dispersion direction.

7. The wavelength selective switching device according to claim 6, wherein, The second transformation unit includes an upper region, a middle region, and a lower region arranged sequentially along the switching direction; The upper region includes a first transmission component, the middle region includes a reflection component, and the lower region includes a second transmission component; or, the upper region includes a first reflection component, the middle region includes a transmission component, and the lower region includes a second reflection component.

8. The wavelength selective switching device according to claim 6, wherein, The third part is a glass plate, and the fourth part is an optical wedge, or the third part is an optical wedge and the fourth part is a glass plate.

9. The wavelength selective switching device according to claim 3, wherein, The dispersive element includes a fourth transformation lens, a grating, and a fifth transformation lens arranged sequentially along the optical axis. The fourth transforming lens is used to adjust the light propagation direction of the incident light signal so that the light signal emitted from the fourth transforming lens is focused on the grating; The grating is used to dissipate and decompose the optical signal from each input port into multiple sub-optical signals of different wavelengths in the dispersion direction, and transmit them to the fifth transformation lens. The fifth transformation lens is used to adjust the light propagation direction of the incident sub-light signal so that the sub-light signal emitted from the fifth transformation lens is transmitted along the optical axis to the corresponding area on the first spatial light modulator.

10. The wavelength selective switching device according to claim 9, wherein, The grating includes a prism grating or a blazed grating.

11. The wavelength selective switch apparatus of claim 1, wherein, The first spatial light modulator includes a first region and a second region divided along the switching direction; The first region is configured to receive multiple sub-optical signals of different wavelengths corresponding to the first optical signal, and to adjust the light propagation direction of the received sub-optical signals; The second region is configured to receive multiple sub-optical signals of different wavelengths corresponding to the second optical signal, and to adjust the light propagation direction of the received sub-optical signals.

12. The wavelength selective switch apparatus of claim 11, wherein, The first region includes multiple rows of first sub-regions arranged sequentially along the switching direction, the number of rows of the first sub-regions being equal to the number of input ports of the corresponding first wavelength selection switch; the second region includes multiple rows of second sub-regions arranged sequentially along the switching direction, the number of rows of the second sub-regions being equal to the number of input ports of the corresponding second wavelength selection switch; Multiple sub-optical signals corresponding to the first optical signal emitted from the beam splitting element and originating from the input port of the first wavelength selection switch are transmitted to a row of first sub-regions. Each row of first sub-regions receives multiple sub-optical signals corresponding to the first optical signal from one input port of the first wavelength selection switch. Multiple sub-optical signals corresponding to the second optical signal emitted from the beam splitting element and from the input port of the second wavelength selection switch are transmitted to a row of second sub-regions. Each row of second sub-regions receives multiple sub-optical signals corresponding to the second optical signal from one input port of the second wavelength selection switch.

13. The wavelength selective switch apparatus of claim 1, wherein, The wavelength selective switching device further includes a second spatial light modulator; The beam splitter is also configured to guide the third optical signal to a corresponding region on the second spatial light modulator. The second spatial light modulator is configured to receive a third optical signal corresponding to each of the input ports and adjust the light propagation direction of the third optical signal to transmit the third optical signal of the corresponding region on the second spatial light modulator to the output port corresponding to the second optical transmission array.

14. The wavelength selective switching device according to claim 13, wherein, The second spatial light modulator includes two columns of control regions, each column of control regions including at least two control regions, wherein one column of control regions corresponds to the output port of the first wavelength selection switch, and the other column of control regions corresponds to the output port of the second wavelength selection switch. Each control region is used to adjust the light propagation direction of the received third optical signal and transmit the third optical signal to the corresponding output port.

15. The wavelength selective switch apparatus of claim 13, wherein, The second optical transmission array includes a second optical fiber array and a second microlens array; The second fiber array includes optical fibers that are arranged one-to-one with the output ports, and the second microlens array includes microlens units that are arranged one-to-one with the optical fibers. The microlens units are configured to perform spot transformation on the third optical signal output by the second spatial light modulator and transmit it to the corresponding output port.

16. An optical network device comprising a wavelength selective switching device as claimed in any one of claims 1-15.

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