Wavelength selective switch device and optical network device

Abstract

The invention provides a wavelength selection switch device and an optical network device, and the device comprises a first optical transmission array which is provided with at least two input ports of a first wavelength selection switch and at least two input ports of a second wavelength selection switch; the light beam separation element is configured to separate the first optical signal and the second optical signal in a dispersion direction, and perform dispersion decomposition on each optical signal in the dispersion direction to obtain a plurality of sub-optical signals with different wavelengths; the first spatial light modulator is configured to receive a plurality of sub-optical signals of different wavelengths corresponding to the input port and adjust the light propagation direction of the sub-optical signals; the light beam separation element is further configured to synthesize a plurality of sub-optical signals corresponding to the output ports into third optical signals and guide and transmit the third optical signals to the corresponding output ports; and the second optical transmission array is provided with two columns of output ports, one column of output ports are output ports of the first wavelength selection switch, and the other column of output ports are output ports of the second wavelength selection switch.

Description

Technical Field

[0001] The present application relates to the field of optical fiber communication technology, and in particular to a wavelength selection switch device and an optical network component. Background Art

[0002] In recent years, with the rise of short videos, cloud computing, and Large Language Model AI (LLM AI), data traffic in the network is experiencing exponential growth, and the demand for add / drop of service wavelengths at ROADM (Reconfigurable Optical Add-Drop Multiplexer) nodes is increasing.

[0003] As the core component of ROADM nodes, wavelength selective switches (WSS) can dynamically operate optical signals in the spectral domain and space, significantly improving the intelligence, flexibility and reliability of the network. They are the key to realizing all-optical intelligent networks.

[0004] In some related technologies, ROADM nodes need to implement wavelength addition and drop at the same time, so the actual addition and drop WSS required is a Twin structure, that is, a WSS device contains two WSSs, WSS1 is used for wavelength addition, and WSS2 is used for wavelength drop. Among them, in the MxN WSS with Twin structure, the input or output optical paths of the two WSSs are independently set, which will bring the following problems: the device size increases, and the debugging complexity and time increase. The above shortcomings will cause the cost of the MxN WSS with Twin structure to rise, affecting its large-scale deployment in ROADM nodes. Summary of the invention

[0005] The present application provides a wavelength selection switch device and an optical network component.

[0006] The embodiment of the present application provides a wavelength selection switch device, the wavelength selection switch device comprising:

[0007] a first optical transmission array having a plurality of input ports arranged along a switching direction, the plurality of input ports comprising at least two input ports of a first wavelength selective switch and at least two input ports of a second wavelength selective switch;

[0008] a beam splitting element, configured to separate a first optical signal from an input port of the first wavelength selective switch and a second optical signal from an input port of the second wavelength selective switch in a dispersion direction, and to disperse 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 corresponding different regions on the first spatial light modulator;

[0009] a first spatial light modulator, configured to receive a plurality of sub-light signals of different wavelengths corresponding to the input port, and adjust light propagation directions of the sub-light signals to guide the sub-light signals to be transmitted to the beam splitting element;

[0010] The beam splitting element is further configured to synthesize a plurality of sub-light signals of different wavelengths corresponding to the input port emitted from the first spatial light modulator into a third light signal, and guide the third light signal to be transmitted to the corresponding output port in the second light transmission array;

[0011] The second optical transmission array has a plurality of output ports arranged along the switching direction, wherein the plurality of output ports are configured as two columns of output ports, each column of output ports includes at least two output ports, wherein one column of output ports is the output port of the first wavelength selective switch, and the other column of output ports is the output port of the second wavelength selective switch.

[0012] The embodiment of the present application also provides an optical network device, including the wavelength selection switch device provided in the embodiment of the present application.

[0013] According to the wavelength selective switch device and optical network device provided in the embodiments of the present application, the optical signals of the two wavelength selective switches can be separated in the dispersion direction through the beam separation element, and modulated and switched through the first spatial light modulator, so that the first wavelength selective switch and the second wavelength selective switch can realize a Twin structure in space, and realize that the two wavelength selective switches can multiplex the input / output optical path, saving the space of one input / output optical path, saving the cost of one input / output optical path element, and during commissioning, only one wavelength selective switch needs to be aligned, and the other wavelength selective switch can be automatically aligned, which effectively improves the problem of complex and time-consuming commissioning of the wavelength selective switch with Twin structure in the related art, and is conducive to the large-scale deployment of the wavelength selective switch with Twin structure in ROADM nodes.

[0014] With regard to the above embodiments and other aspects of the present application and their implementation, further description is provided in the accompanying drawings, detailed description and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In the accompanying drawings of the embodiments of the present application:

[0016] Figure 1 A schematic diagram of the architecture of a ROADM node in the related art is shown.

[0017] Figure 2 A schematic diagram of a light spot on LCOS in a 1xN WSS in the related art is shown.

[0018] Figure 3 A schematic diagram of the architecture of a CDC-ROADM node in the related art is shown.

[0019] Figure 4 A schematic diagram of a light spot on LCOS in an MxN WSS in the related art is shown.

[0020] Figure 5 A schematic diagram of the composition structure of a wavelength selection switch device provided in an embodiment of the present application is shown.

[0021] Figure 6 A schematic diagram of the composition structure of a first optical transmission array provided in an embodiment of the present application is shown.

[0022] Figure 7 A schematic diagram of the composition structure of a beam splitting element provided in an embodiment of the present application is shown.

[0023] Figure 8 A schematic diagram of the composition structure of a separation element provided in an embodiment of the present application is shown.

[0024] Fig. 9 A schematic diagram of the composition structure of a light path guiding element provided in an embodiment of the present application is shown.

[0025] Fig.10 A schematic diagram of the composition structure of a dispersion element provided in an embodiment of the present application is shown.

[0026] Fig.11 A schematic diagram of the composition structure of a first spatial light modulator provided in an embodiment of the present application is shown.

[0027] Fig.12 A schematic diagram of the composition structure of another wavelength selection switch device provided in an embodiment of the present application is shown.

[0028] Fig.13 A schematic diagram of the composition structure of a second spatial light modulator provided in an embodiment of the present application is shown.

[0029] Fig.14 A schematic diagram of the composition structure of a second optical transmission array provided in an embodiment of the present application is shown.

[0030] Fig.15 A schematic diagram showing the wavelength switching principle of a wavelength selective switch device in a switching direction according to an embodiment of the present application is shown.

[0031] Fig.16 A schematic diagram showing the principle of a second wavelength selective switch in the dispersion direction provided by an embodiment of the present application is shown.

[0032] Fig.17 A schematic diagram showing the principle of a first wavelength selective switch in the dispersion direction provided by an embodiment of the present application is shown. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0034] The present application will be described more fully below with reference to the accompanying drawings, but the embodiments shown may be embodied in different forms, and the present application should not be construed as being limited to the embodiments set forth below. On the contrary, the purpose of providing these embodiments is to make the present application thorough and complete, and to enable those skilled in the art to fully understand the scope of the present application.

[0035] The accompanying drawings of the embodiments of the present application are used to provide a further understanding of the embodiments of the present application, and constitute a part of the specification. Together with the detailed embodiments, they are used to explain the present application, and do not constitute a limitation of the present application. By describing the detailed embodiments with reference to the accompanying drawings, the above and other features and advantages will become more obvious to those skilled in the art.

[0036] The present application may be described with reference to plan views and / or cross-sectional views by means of ideal schematic views of the present application. Therefore, the exemplary illustrations may be modified according to manufacturing techniques and / or tolerances.

[0037] In the absence of conflict, the embodiments of the present application and the features therein may be combined with each other.

[0038] The terms used in this application are only used to describe specific embodiments and are not intended to limit the application. The term "and / or" as used in this application includes any and all combinations of one or more related enumerated items. The singular forms "one" and "the" as used in this application are also intended to include plural forms, unless the context clearly indicates otherwise. The terms "including", "made of..." as used in this application specify the presence of the features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups thereof.

[0039] Unless otherwise defined, all terms (including technical and scientific terms) used in this application have the same meaning as those commonly understood by those 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 explicitly defined in this application.

[0040] In some related technologies, ROADM nodes implement wavelength add / drop based on 1×N WSS back-to-back connections, such as Figure 1 As shown, optionally, taking the 4x4 dimension on the line side as an example, the line side requires 8 1x5 WSS networks (MESH) to be interconnected; the lower side requires 2 1X4 WSS back-to-back connections to realize the scheduling of the lower wavelength, and then connects 4 1-division 16Sp (Splitter) lower wavelengths. Optionally, additional identical components are required to achieve 1:1 protection on the lower side; the upper side requires 4 1-division 16Cp (Coupler) upper wavelengths, and then 2 1X4WSS back-to-back connections are used to realize the scheduling of the upper wavelength. Optionally, additional identical components are required to achieve 1:1 protection on the upper side. Because it is based on 1×N WSS interconnection, the design determines that after the optical signals of all ports are expanded through grating dispersion, there is only one row of light spots on the liquid crystal on silicon LCOS (Liquid Crystal on Silicon), and only 120 wavelengths (λ) of one band can be processed. The 120 wavelengths are arranged sequentially on the LCOS, and each wavelength can only cover a certain area, such as Figure 2 Optionally, the wavelength band processed by WSS can be C-band, L-band, S-band, C+L-band, etc. Therefore, if the same frequency wavelength exists in both the uplink and downlink, the above ROADM node cannot process it, that is, there is wavelength contention.

[0041] In some related technologies, the CDC-ROADM (Colorless, Directionless, Contentionless Reconfigurable Optical Add-Drop Multiplexer) node architecture is as follows: Figure 3 As shown in FIG. 1 , the MxN WSS has multiple COM ports (Communication Port, serial communication interface) in design. M optical signals are transmitted and transformed by the optical system, covering M rows of light spots on the LCOS. At the same time, there are M areas covered by the same frequency wavelength, such as Figure 4 As shown. Therefore, M wavelengths of the same frequency can be processed simultaneously to achieve wavelength-free (Contentionless) add / drop. Figure 3As shown, taking the 4x4 dimension on the line side as an example, the add / drop road side uses a Twin structure 4x16WSS to add / drop waves, and the ROADM node can process 4 wavelengths of the same frequency at the same time. Optionally, a Twin structure 8x24WSS is used to add / drop waves, and the ROADM node can process 8 wavelengths of the same frequency at the same time. Here, it is only for the purpose of illustrating the architecture of the ROADM node in the related art, and the number of M and N is not specifically limited.

[0042] As mentioned above, ROADM sites need to implement wavelength addition and drop at the same time, so the actual addition and drop WSS required is a Twin structure, that is, one WSS device contains two WSSs, WSS1 is used for wavelength addition, and WSS2 is used for wavelength drop. In the Twin structure MxN WSS in the related art, the input / output optical paths of the two WSSs are independent, which will bring the following problems: the device size increases, and the debugging complexity and time increase. The above shortcomings will cause the cost of the Twin structure MxN WSS to rise, affecting its large-scale deployment in ROADM nodes.

[0043] The embodiments of the present application provide a wavelength selection switch device and an optical network device, aiming to effectively improve the technical problems existing in the above-mentioned related technologies.

[0044] See also Figure 5 , Figure 5 A schematic diagram of the composition structure of a wavelength selection switch device provided in an embodiment of the present application is shown. The embodiment of the present application provides a wavelength selection switch device 100, and the wavelength selection switch device 100 includes but is not limited to the following components.

[0045] The first optical transmission array 101 has a plurality of input ports in arranged along a switching direction x, wherein the plurality of input ports in include at least two input ports (in11-in1M) of a first wavelength selective switch and at least two input ports (in21-in2M) of a second wavelength selective switch.

[0046] The beam separation element 102 is configured to separate the first optical signal from the input port (in11~in1M) of the first wavelength selective switch and the second optical signal from the input port (in21~in2M) of the second wavelength selective switch in the dispersion direction y, and disperse and decompose the optical signal corresponding to each input port in into a plurality of sub-optical signals of different wavelengths in the dispersion direction y, and the switching direction x is perpendicular to the dispersion direction y; 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 corresponding different areas on the first spatial light modulator 103.

[0047] The first spatial light modulator (SLM) 103 is configured to receive a plurality of sub-optical signals of different wavelengths corresponding to the input port in, and adjust the light propagation directions of the sub-optical signals to guide the sub-optical signals to be transmitted to the beam splitting element 102 .

[0048] The beam splitting element 102 is further configured to synthesize a plurality of sub-light signals of different wavelengths corresponding to the input port in emitted from the first spatial light modulator 103 into a third light signal, and guide the third light signal to be transmitted to the corresponding output port out in the second light transmission array 104 .

[0049] The second optical transmission array 104 has a plurality of output ports out arranged along the switching direction x, and the plurality of output ports out are configured as two columns of output ports, each column of output ports includes at least two output ports, wherein one column of output ports (out11 to out1N) is the output port of the first wavelength selective switch, and the other column of output ports (out21 to out2N) is the output port of the second wavelength selective switch.

[0050] In an embodiment of the present application, the first light transmission array 101 / the second light transmission array 104, the beam separation element 102, and the first spatial light modulator 103 are arranged in sequence along the optical axis direction z, and the optical axis direction z is perpendicular to the switching direction x and the dispersion direction y.

[0051] In the embodiment of the present application, the switching direction is defined as the arrangement direction of the input ports, corresponding to the direction of the illustrated coordinate x; the dispersion direction is defined as the direction in which the dispersed light signal is expanded, corresponding to the direction of the illustrated coordinate y; the optical axis direction is defined as the arrangement direction of the first optical transmission array 101 / the second optical transmission array 104, the beam separation element 102, and the first spatial light modulator 103, corresponding to the direction of the illustrated coordinate z.

[0052] In the embodiment of the present application, the wavelength selective switch device 100 is a wavelength selective switch WSS with a Twin structure, which is suitable for an add-drop wavelength selective switch (ADWSS) and is used to implement wavelength add / drop in an optical network device (such as a ROADM node, an optical cross-connector OXC). The wavelength selective switch device 100 includes a first wavelength selective switch and a second wavelength selective switch, both of which are MxN WSSs, where M and N are greater than or equal to 2, and M and N are integers, and 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).

[0053] Among them, at least two input ports (in11-in1M) of the first wavelength selective switch and at least two input ports (in21-in2M) of the second wavelength selective switch are integrated in the first optical transmission array 101. In the first optical transmission array 101, at least two input ports (in11-in1M) of the first wavelength selective switch and at least two input ports (in21-in2M) of the second wavelength selective switch are sequentially arranged in intervals along the switching direction x. In some embodiments, Figure 5 As shown, in the switching direction x, at least two input ports (in11-in1M) of the first wavelength selective switch are sequentially arranged above the optical axis, and at least two input ports (in21-in2M) of the second wavelength selective switch are sequentially arranged below the optical axis.

[0054] At least two output ports (out11 to out1N) of the first wavelength selective switch and at least two output ports (out21 to out2N) of the second wavelength selective switch are integrated in the second optical transmission array 104. The second optical transmission array 104 is a two-dimensional array having two columns of output ports. The at least two output ports (out11 to out1N) of the first wavelength selective switch are sequentially arranged in a row of output ports along the switching direction x, and the at least two output ports (out21 to out2N) of the second wavelength selective switch are sequentially arranged in a row of output ports along the switching direction x. In some embodiments, Figure 5 As shown, in the switching direction x, the output port of the first wavelength selective switch and the output port of the second wavelength selective switch are alternately arranged in sequence.

[0055] In the embodiment of the present application, the input port in in the first optical transmission array 101 is used to receive / transmit the corresponding optical signal, and the output port out in the second optical transmission array 101 is used to receive / transmit the corresponding optical signal.

[0056] In the embodiment of the present application, the first wavelength selective switch and the second wavelength selective switch multiplex the beam splitting element 102 and the first spatial light modulator 103. The beam splitting element 102 separates the first optical signal from the input port of the first wavelength selective switch and the second optical signal from the input port of the second wavelength selective switch in the dispersion direction, and disperses and decomposes the optical signal of each input port into a plurality of sub-optical signals of different wavelengths in the dispersion direction y, and then transmits them to the corresponding different areas on the first spatial light modulator 103 along the optical axis direction z respectively, and is phase modulated by the first spatial light modulator 103 to realize the switching of each sub-optical signal corresponding to each input port. The switched sub-optical signal can be propagated to the beam splitting element 102 along the set angle, and the plurality of sub-optical signals of different wavelengths corresponding to each input port are converged and synthesized into a third optical signal containing multiple wavelengths in the beam splitting element 102. The third optical signal is guided by the beam splitting element 102 to propagate to the corresponding output port out in the second optical transmission array 101. In this way, the optical signals of the two wavelength selective switches can be separated in the dispersion direction through the beam separation element 102, and modulated and switched through the first spatial light modulator 103, so that the first wavelength selective switch and the second wavelength selective switch can realize a Twin structure in space, and realize that the two wavelength selective switches can multiplex the input / output optical path, saving the space of one input / output optical path, saving the cost of one input / output optical path element, and during commissioning, only one wavelength selective switch needs to be aligned, and the other wavelength selective switch can be automatically aligned, which effectively improves the problem of complex and time-consuming commissioning of the wavelength selective switch with Twin structure in the related art, and is conducive to the large-scale deployment of the wavelength selective switch with Twin structure in ROADM nodes.

[0057] According to the wavelength selective switch device provided in the embodiment of the present application, the optical signals of the two wavelength selective switches can be separated in the dispersion direction through the beam separation element, and modulated and switched through the first spatial light modulator, so that the first wavelength selective switch and the second wavelength selective switch can realize a Twin structure in space, and realize that the two wavelength selective switches can multiplex the input / output optical path, saving the space of one input / output optical path, saving the cost of one input / output optical path element, and during commissioning, only one wavelength selective switch needs to be aligned, and the other wavelength selective switch can be automatically aligned, which effectively improves the problem of complex and time-consuming commissioning of the wavelength selective switch with Twin structure in the related art, and is conducive to the large-scale deployment of the wavelength selective switch with Twin structure in ROADM nodes.

[0058] Figure 6 A schematic diagram of the composition structure of a first optical transmission array provided in an embodiment of the present application is shown. In some embodiments, for example, Figure 6As shown, the first optical transmission array 101 includes a first optical fiber array 101A and a first microlens array 101B, and the first optical fiber array 101A and the first microlens array 101B are packaged in the same device; the first optical fiber array 101A includes optical fibers arranged in a one-to-one correspondence with the input ports (in11~in1M, in21~in2M), each optical fiber can be connected to a corresponding light source, and the light source inputs a corresponding optical signal through the corresponding optical fiber; the first microlens array 101B includes microlens units 101B1 arranged in a one-to-one correspondence with the optical fibers, and the microlens units 101B1 are configured to perform spot transformation on the optical signal output through the corresponding optical fiber and output it to the beam separation element 102.

[0059] Figure 7 A schematic diagram of the structure of a beam splitting element provided in an embodiment of the present application is shown. In some embodiments, for example, Figure 7 As shown, the beam separation element 102 includes a separation element 102A, a light path guiding element 102B and a dispersive element 102C which are sequentially arranged along the optical axis direction; wherein the separation element 102A is configured to separate the first optical signal from the input port (in11-in1M) of the first wavelength selective switch and the second optical signal from the input port (in21-in2M) of the second wavelength selective switch in the dispersion direction y, and the first optical signal and the second optical signal separated in the dispersion direction y are transmitted to the light path guiding element 102B along the optical axis direction z; the light 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 separate each input port from the first optical signal ... The optical signal corresponding to the input port in is dispersed and decomposed into multiple sub-optical signals of different wavelengths in the dispersion direction y, 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 the corresponding different areas on the first spatial light modulator 103 along the optical axis direction z; the dispersion element 102C is also configured to synthesize 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 be transmitted 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 to the corresponding output port out in the second optical transmission array 104 after being transmitted through the separation element 102A.

[0060] Figure 8 A schematic diagram of the composition structure of a separation element provided in an embodiment of the present application is shown. In some embodiments, for example, Figure 8As shown, the separation element 102A includes a first conversion unit, and the first conversion unit includes a first part 102A1 and a second part 102A2 arranged in sequence along the switching direction x, that is, the first conversion unit is divided into two parts in space along the yoz plane where the optical axis is located, the upper part is the first part 102A1, and the lower part is the second part 102A2.

[0061] Among them, one of the first part 102A1 and the second part 102A2 is set corresponding to the input port (in11~in1M) of the first wavelength selective switch, and the other is set corresponding to the input port (in21~in2M) of the second wavelength selective switch; one of the first part 102A1 and the second part 102A2 is used to deflect the light propagation direction of the corresponding incident optical signal along the dispersion direction y, and the other is used to transmit the corresponding incident optical signal.

[0062] In some embodiments, the first portion 102A1 is arranged corresponding to the input port (in11-in1M) of the first wavelength selective switch, and the second portion 102A2 is arranged corresponding to the input port (in21-in2M) of the second wavelength selective switch. The first optical signal emitted from the input port (in11-in1M) of the first wavelength selective switch is incident on the first portion 102A1 of the separation element 102A along the optical axis direction. The first portion 102A1 separates the first optical signal from the input port (in21-in2M) of the first wavelength selective switch. The light propagation direction is deflected along the dispersion direction y, and the first optical signal emitted from the first part 102A1 is transmitted along the optical axis direction to the optical path guiding element 102B; the second optical signal emitted through the input port (in21~in2M) of the second wavelength selection switch is incident on the second part 102A2 of the separation element 102A along the optical axis direction, and the second part 102A2 transmits the second optical signal from the input port of the second wavelength selection switch, and the second optical signal emitted from the second part 102A2 is transmitted along the optical axis direction to the optical path guiding element 102B.

[0063] Regarding the situation where the first part 102A1 corresponds to the input port (in21~in2M) of the second wavelength selective switch and the second part 102A2 corresponds to the input port (in11~in1M) of the first wavelength selective switch, reference may be made to the description of the situation where the first part 102A1 corresponds to the input port (in11~in1M) of the first wavelength selective switch and the second part 102A2 corresponds to the input port (in21~in2M) of the second wavelength selective switch, which will not be repeated here.

[0064] In some embodiments, in the first transformation unit, the first portion 102A1 is an optical wedge, and the second portion 102A2 is a glass plate; or, the first portion 102A1 is a glass plate, and the second portion 102A2 is an optical wedge.

[0065] It should be noted that the embodiment of the present application does not impose any special restrictions on the specific implementation form of the first conversion unit. As long as it is a component that can be used to separate the optical signals of the input ports of the two wavelength selective switches in the dispersion direction y, it is within the protection scope of the embodiment of the present application.

[0066] Fig. 9 A schematic diagram of the structure of a light path guiding element provided in an embodiment of the present application is shown. In some embodiments, Fig. 9 As shown, in the beam splitting element 102, the light path guiding element 102B includes: 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, which are arranged in sequence along the optical axis direction z.

[0067] The first transformation lens 102B1 is used to adjust the light propagation direction of the light signal from the separation element 102A, so that the light signal emitted from the first transformation lens 102B1 is focused on the middle area of ​​the second transformation unit 102B2; the second transformation unit 102B2 is used to adjust the light propagation direction of the incident light signal, so that the light signal emitted from the second transformation unit 102B2 is transmitted to the second transformation lens 102B3 along the incident direction; the second transformation lens 102B3 is used to adjust the light propagation direction of the incident light signal, so that the light signal emitted from the second transformation lens 102B3 is transmitted to the third transformation unit 102B4 along the optical axis direction z; The transformation unit 102B4 includes a third part 102B4-1 and a fourth part 102B4-2 which are sequentially arranged 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 transformation lens 102B5, and the other is used to transmit the corresponding incident light signal to the third transformation lens 102B5; the third transformation lens 102B5 is used to perform light 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.

[0068] In some embodiments, the lens surface of the first transformation lens 102B1 includes but is not limited to a spherical surface, which is used to achieve the transformation of the output position / angle of the incident light signal.

[0069] In some embodiments, the second conversion unit 102B2 may be a multifunctional reflector, which is used to select the incident light signal so that the middle area reflects and the edge area transmits. The second conversion unit 102B2 includes an upper area, a middle area and a lower area sequentially arranged along the switching direction; the upper area includes a first transmission component, the middle area includes a reflection component, and the lower area includes a second transmission component; or the upper area includes a first reflection component, the middle area includes a transmission component, and the lower area includes a second reflection component.

[0070] In some embodiments, the lens surface of the second transformation lens 102B3 includes but is not limited to a spherical surface, which is used to achieve the transformation of the output position / angle of the incident light signal.

[0071] In some embodiments, when the first part 102A1 in 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 in the third conversion unit 102B4 is used to transmit the corresponding incident light signal; when the first part 102A1 in the separation element 102A is used to transmit the corresponding incident light signal, the third part 102B4-1 in the third conversion unit 102B4 is used to deflect the light propagation direction of the incident light signal in the dispersion direction y.

[0072] 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, so as to achieve the deflection of part of the incident optical signal in the dispersion direction y, and directly transmit the other part of the optical signal, so that different optical signals are separated in the dispersion direction y.

[0073] In some embodiments, the lens surface of the third transformation lens 102B5 includes but is not limited to a cylindrical surface arranged along the dispersion direction y, so as to realize spot transformation of the incident light signal in the dispersion direction y.

[0074] In some embodiments, in the direction in which the optical signal is transmitted from the 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 to the separation element 102A along the optical axis direction z, and then the first optical signal and the second optical signal are separated in the dispersion direction y under the action of the separation element 102A, and after separation, they are emitted from the separation element 102A and transmitted to the optical path guiding element 102B along the optical axis direction z; in the optical path guiding element 102B, after the position / angle is transformed and adjusted by the first transformation lens 102B1, they are focused on the middle area of ​​the second transformation unit 102B2; after the position / angle is transformed and adjusted by the second transformation unit 102B2, they are transmitted to the second transformation lens 102B3 along the direction of incidence on the second transformation unit 102B2; after the position / angle is transformed and adjusted by the second transformation lens 102B3, they are transmitted to the second transformation lens 102B3 along the direction of incidence on the second transformation unit 102B2. The first optical signal is transmitted to the third conversion unit 102B4 in the direction of the optical axis z; wherein 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, or 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 converts the corresponding incident optical signal The fourth part 102B4-2 deflects the light propagation direction of the corresponding incident light signal along the dispersion direction y and then emits it, or the third part 102B4-1 deflects the light propagation direction of the corresponding incident light signal along the dispersion direction y and then emits it, and the fourth part 102B4-2 transmits the corresponding incident light signal; then, the light signal emitted from the third transformation unit 1024B is transmitted through the third transformation lens 102B5 and then transmitted to the dispersion element 102C along the optical axis direction z.

[0075] In some embodiments, in the direction of the optical signal being transmitted from the first spatial light modulator 103 to the output port out, the first spatial light modulator 103 performs angle switching on a plurality of sub-optical signals of different wavelengths corresponding to each input port in, and then the signals are incident to the dispersion element 102C along a set angle. The plurality of sub-optical signals of different wavelengths corresponding to each input port in are converged and synthesized into a corresponding third optical signal under the action of the dispersion element 102C, and the third optical signal is guided and transmitted to the optical path guiding element 102B via the dispersion element 102C. In the optical path guiding element 102B, the third optical signal is angle-converted or transmitted via each unit and lens in the optical path guiding element 102B, and then the third optical signal is guided and transmitted via the separation element 102A to the corresponding output port out in the second optical transmission array 104.

[0076] Fig.10A schematic diagram of the composition structure of a dispersion element provided in an embodiment of the present application is shown. In some embodiments, for example, Fig.10 As shown, the dispersion element 102C includes a fourth transformation lens 102C1, a grating 102C2 and a fifth transformation lens 102C3 which are sequentially arranged along the optical axis direction z.

[0077] Among them, the fourth transformation lens 102C1 is used to adjust the light propagation direction of the incident light signal so that the light signal emitted from the fourth transformation lens 102C1 is focused on the grating 102C2; the grating 102C2 is used to disperse the light signal from each input port in the dispersion direction y into multiple sub-light signals of different wavelengths, and transmit them to the fifth transformation lens 102C3; the fifth transformation lens 102C3 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 102C3 is transmitted along the optical axis direction z to the corresponding area on the first spatial light modulator 103.

[0078] In some embodiments, the grating 102C2 includes but is not limited to a prism grating or a blazed grating, and is used to achieve decomposition and synthesis of optical signals.

[0079] It can be understood that in the optical paths of the first wavelength selective switch and the second wavelength selective switch, the embodiment of the present application adopts a folded optical path method, so that the optical path of the wavelength selective switch repeatedly passes through the grating 102C2 of the dispersion element 102C twice, and the same grating 102C2 is multiplexed both times.

[0080] Taking an input port of the first wavelength selective switch as an example, the first optical signal emitted from the input port of the first wavelength selective switch is deflected in the dispersion direction y by the separation element 102A, and then guided and transmitted to the dispersion element 102C via the optical path guiding element 102B. In the dispersion element 102C, the first optical signal is adjusted by the angle transformation of the fourth transformation lens 102C1, focused on the grating 102C2, dispersed and decomposed into multiple sub-optical signals of different wavelengths by the grating 102C2, and then propagated along the optical axis direction z to the corresponding area on the first spatial light modulator 103 through the angle transformation of the fifth transformation lens 102C3. In this process, the optical signal passes through the grating 102C2 of the dispersion element 102C for the first time.

[0081] The sub-light signals of different wavelengths corresponding to the input port of the first wavelength selection switch are incident on the dispersion element 102C at a set angle after angle switching by the first spatial light modulator 103, and are transmitted to the grating 102C2 after angle conversion and adjustment by the fifth conversion lens 102C3 in the dispersion element 102C. Under the action of the grating 102C2, the sub-light signals of different wavelengths corresponding to the input port are converged and synthesized into a third light signal containing multiple wavelengths. After being emitted from the grating 102C2, the third light signal is angle converted and adjusted by the fourth conversion lens 102C1, and is transmitted to the light path guiding element 102B. In this process, the light signal passes through the grating 102C2 of the dispersion 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.

[0082] In some embodiments, the lens surface of the fourth transformation lens 102C1 includes but is not limited to a spherical surface, which is used to achieve the transformation of the output position / angle of the incident light signal.

[0083] In some embodiments, the lens surface of the fifth transformation lens 102C3 includes but is not limited to a spherical surface, which is used to achieve the transformation of the output position / angle of the incident light signal.

[0084] In some embodiments, in the optical axis direction z, other compensation elements may be arranged before and after the fourth conversion lens 102C1 or the fifth conversion lens 102C3. The other compensation elements may be wedges without optical power, polarization conversion elements, or other lenses with optical power, and the surface shape is not limited to a spherical surface. It can be understood that in the optical path of the first wavelength selective switch and the second wavelength selective switch, the embodiment of the present application adopts a folded optical path, so that the optical path of the wavelength selective switch repeatedly passes through the fourth conversion lens 102C1 and the fifth conversion lens 102C3 for several times, and the fourth conversion lens 102C1 and the fifth conversion lens 102C3 are multiplexed lenses or lens groups.

[0085] It should be noted that the embodiment of the present application does not impose any special restrictions on the specific implementation forms of the various components in the beam splitting element 102, as long as the required optical functions can be achieved.

[0086] Fig.11 A schematic diagram of the composition structure of a first spatial light modulator provided in an embodiment of the present application is shown. In some embodiments, for example Fig.11 As shown, the first spatial light modulator 103 includes a first area 103A and a second area 103B divided along the switching direction x, that is, the first spatial light modulator 103 is spatially divided into upper and lower areas along the yoz plane, the upper area is the first area 103A, and the lower area is the second area 103B.

[0087] Among them, the first area 103A is configured to receive multiple sub-optical signals of different wavelengths corresponding to the first optical signal, and adjust the optical propagation direction of the received sub-optical signals; the second area 103B is configured to receive multiple sub-optical signals of different wavelengths corresponding to the second optical signal, and adjust the optical propagation direction of the received sub-optical signals.

[0088] In some embodiments, Fig.11 As shown, the first area 103A includes a plurality of rows of first sub-areas 103A1 sequentially arranged along the switching direction x, and the number of rows of the first sub-areas 103A1 is equal to the number of input ports (in11~in1M) of the corresponding first wavelength selection switch; the second area 103B includes a plurality of rows of second sub-areas 103B1 sequentially arranged along the switching direction x, and the number of rows of the second sub-areas 103B1 is equal to the number of input ports (in21~in2M) of the corresponding second wavelength selection switch.

[0089] The plurality of sub-optical signals corresponding to the first optical signal from the input port of the first wavelength selective switch emitted from the beam splitting element 102 are transmitted to a row of first sub-regions 103A1, and each row of first sub-regions 103A1 receives a plurality of sub-optical signals corresponding to the first optical signal from an input port of the first wavelength selective switch. The plurality of sub-optical signals corresponding to the first optical signal of each input port of the first wavelength selective switch can be formed in the corresponding row of first sub-regions 103A1 as follows: Figure 3 The light spot shown.

[0090] The multiple sub-optical signals corresponding to the second optical signal from the input port of the second wavelength selective switch emitted from the beam splitting element 102 are transmitted to a row of second sub-areas 103B1 respectively. Each row of second sub-areas 103B1 receives multiple sub-optical signals corresponding to the second optical signal from an input port of the second wavelength selective switch. The multiple sub-optical signals corresponding to the first optical signal of each input port of the first wavelength selective switch can be formed in the corresponding row of second sub-areas 103B1 as follows: Figure 3 The light spot shown.

[0091] In some embodiments, a plurality of sub-light signals corresponding to the light signal of each input port are emitted parallel to the optical axis through the fifth transform lens 102C3 and vertically incident on the corresponding area on the first spatial light modulator to form a corresponding light spot.

[0092] In some embodiments, the first spatial light modulator 103 can be PI-LCOS (Polarization independence Liquid Crystal on Silicon), LCOS (Liquid Crystal on Silicon) or MEMS (Micro-Electro-Mechanical System), which is used to achieve deflection of the light propagation direction of the optical signal.

[0093] Fig.12 FIG. 1 is a schematic diagram showing the composition structure of another wavelength selective switch device provided in an embodiment of the present application. In some embodiments, for example, Fig.12 As shown, the wavelength selective switch device 100 may further include a second spatial light modulator (SLM) 105 .

[0094] Among them, multiple sub-light signals of different wavelengths corresponding to each input port are transmitted to the beam separation element 102 after angle switching via the first spatial light modulator 103. The beam separation element 102 is also configured to synthesize the multiple sub-light signals of different wavelengths corresponding to each input port output by the first spatial light modulator 103 into a third light signal, and guide the third light signal to be transmitted to the corresponding area on the second spatial light modulator 105; the second spatial light modulator 105 is configured to receive the third light signal corresponding to each input port, and adjust the light propagation direction of the third light signal, so as to transmit the third light signal of the corresponding area on the second spatial light modulator 105 to the output port out corresponding to the second light transmission array 104.

[0095] Fig.13 A schematic diagram of the structure of a second spatial light modulator provided in an embodiment of the present application is shown. In some embodiments, Fig.13 As shown, the second spatial light modulator 105 includes two columns of control areas 105A, each column of control areas 105A includes at least two control areas 105A, wherein one column of control areas 105A corresponds to the output ports (out11 to out1N) of the first wavelength selective switch, and the control areas 105A in the one column of control areas 105A are connected and arranged in a one-to-one correspondence with the output ports of the first wavelength selective switch, and the other column of control areas 105A corresponds to the output ports (out21 to out2N) of the second wavelength selective switch, and the control areas 105A in the other column of control areas 105A are connected and arranged in a one-to-one correspondence with the output ports of the second wavelength selective switch, wherein each control area 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.

[0096] In some embodiments, the second spatial light modulator 105 can be PI-LCOS (Polarization independence Liquid Crystal on Silicon), LCOS (Liquid Crystal on Silicon) or MEMS (Micro-Electro-Mechanical System), which is used to achieve deflection of the light propagation direction of the optical signal.

[0097] Fig.14 A schematic diagram of the composition structure of a second optical transmission array provided in an embodiment of the present application is shown. In some embodiments, for example, Fig.14 As shown, the second optical transmission array 104 is a two-dimensional array, and the second optical transmission array 104 includes a second optical fiber array 104A and a second microlens array 104B, and 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 arranged in a one-to-one correspondence with the output ports (out11~out1N, out21~out2N), and the second microlens array 104B includes microlens units 104B1 arranged in a one-to-one correspondence with the optical fibers, and 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.

[0098] In some embodiments, in the optical axis direction z, a polarization diversity unit and a polarization conversion unit may be further included after the first microlens array 101B.

[0099] In some embodiments, in the opposite direction to the optical axis direction z, a polarization diversity unit and a polarization conversion unit may be further included before the second microlens array 104B.

[0100] In the embodiment of the present application, the wavelength selective switch device 100 can be applied to ROADM and optical cross-connectors (Optical Cross-Connect, OXC), and can also construct higher-dimensional optical cross-connect nodes. It can be widely used in various scenarios such as backbone networks, metropolitan area networks, access networks, etc., and is suitable for C-band, L-band, C+L-band, S+C+L-band, etc.

[0101] Fig.15 A schematic diagram showing the wavelength switching principle of a wavelength selective switch device in a switching direction according to an embodiment of the present application is shown. In some embodiments, for example Fig.15As shown, the wavelength selection switch device includes two MxN wavelength selection switches WSS of Twin structure, the dotted arrow represents the optical path of the second wavelength selection switch WSS, the solid arrow represents the optical path of the first wavelength selection switch WSS, and the switching direction is defined as the arrangement direction of the 2M input ports, corresponding to the direction of the coordinate x shown in the figure. Fig.15 The upper middle part shows the optical path of the optical signal input to the first spatial light modulator 103 (such as LCOS) through the first optical transmission array 101, and the lower middle part shows the optical path of the optical signal after being switched by the first spatial light modulator 103 and then switched by the second spatial light modulator 105 and output from the second optical transmission array 104.

[0102] Among them, the optical path can be divided into an input part and an output part, wherein the input part can be split into an input optical path and a main optical path, the optical signal is emitted from the input port of the first optical transmission array 101, and the optical path transmitted to the virtual plane L via the separation element 102A, the first transformation lens 102B1, the second transformation unit 102B2, the second transformation lens 102B3, the third transformation unit 102B4, and the third transformation lens 102B5 is the input optical path of the input part, and the optical signal is emitted from the virtual surface L, and the optical path transmitted to the first spatial light modulator 103 via the fourth transformation lens 102C1, the grating 102C2 and the fifth transformation lens 102C3 is the main optical path of the input part.

[0103] The output part can be divided into an output optical path and a main optical path. The optical path in which the light signal is emitted from the first spatial light modulator 103 and is transmitted to the virtual surface L via the fifth transformation lens 102C3, the grating 102C2 and the fourth transformation lens 102C1 is the main optical path of the output part. The optical path in which the light signal is emitted from the virtual surface L and is transmitted to the second optical transmission array 104 via the third transformation lens 102B5, the third transformation unit 102B4, the second transformation lens 102B3, the second transformation unit 102B2, the first transformation lens 102B1, the separation element 102A and the second spatial light modulator 105 is the output optical path of the output part.

[0104] Since the wavelength switching principles of the first wavelength selection switch WSS and the second wavelength selection switch WSS in the switching direction x are exactly the same, and the paths are also symmetrical about the optical axis, the switching principle is 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.

[0105] The M optical signals pass through the first optical fiber array 101A and the first microlens array 101B in the first optical transmission array 101, transforming the initial Gaussian beam with a small waist radius into a Gaussian beam with a larger waist radius, thereby reducing the divergence angle of the beam. The transformation equation of the Gaussian beam is as follows:

[0106]

[0107] Wherein, ω1 and ω0 are the beam waist radius before and after the 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.

[0108] The M optical signals emitted from different input ports are incident on the first transformation lens 102B1 after passing through the separation element (first transformation unit) 102A, and are focused on the middle area of ​​the second transformation unit 102B2 after passing through the first transformation lens 102B1, so that the optical signal focused on the middle area of ​​the second transformation unit 102B2 is reflected and propagated forward to the second transformation lens 102B3, and the optical signal emitted from the second transformation lens 102B3 parallel to the optical axis is propagated to the virtual surface L after passing through the third transformation unit 102B4 and the third transformation lens 102B5.

[0109] The optical signal passing through the virtual surface L is focused on the grating 102C2 after passing through the fourth transformation lens 102C1, wherein the grating 102C2 has a diffraction effect in the dispersion direction y and has no diffraction effect in the switching direction x; the optical signal passes through the fifth transformation lens 102C3, is emitted parallel to the optical axis, and is vertically incident on the upper half area (first area) of the first spatial light modulator 103. The upper half area (first area) of the first spatial light modulator 103 is divided into M rows of first sub-areas, and the optical signal emitted from each input port is decomposed into multiple sub-optical signals after being dispersed by the grating 102C2, and is incident on the first sub-area corresponding to a row in the first area of ​​the first spatial light modulator 103.

[0110] In some embodiments, the first spatial light modulator 103 is LCOS.

[0111] In the upper half area (first area) of the first spatial light modulator 103, phase modulation is applied to the first sub-area where the light spot of the sub-light signal is located, so as to realize the wavelength switching of each sub-light signal. After the switching, the sub-light signal passes through the fifth transformation lens 102C3, the grating 102C2, the fourth transformation lens 102C1, the virtual surface L, the third transformation unit 102B4 in sequence, and is incident on the second transformation unit 102B2. After being transmitted through the second transformation unit 102B2, it is transmitted to the corresponding control area in the second spatial light modulator 105, as shown in FIG. Fig.13 A voltage is applied to the control area to change the propagation angle of the optical signal to be parallel to the optical axis, and the optical signal is coupled to the corresponding output port of the second optical fiber array 104A after being transformed by the second microlens array 104B in the second optical transmission array 104.

[0112] In some embodiments, the second spatial light modulator 105 is a MEMS mirror, wherein the pitch of the MEMS mirror can be set to 330 μm.

[0113] In some embodiments, the optical power of the second microlens array 104B is the same as or different from that of the first microlens array 101B.

[0114] It should be noted that in the switching direction, in the output optical path, since some optical devices do not play a role in the optical path, Fig.15 In the output light path section, the optical components in this section are not shown.

[0115] Fig.16 FIG. 1 shows a schematic diagram of the principle of a second wavelength selective switch in the dispersion direction provided by an embodiment of the present application. In some embodiments, for example, Fig.16 As shown, the second part 102A2 in the separation element (first conversion unit) 102A and the third part 102B4-1 in the third conversion unit 102B4 are glass plates for compensating the optical path; 105.2 represents the second column control area of ​​the second spatial light modulator 105, and 104.2 represents the second column of the second optical fiber array 104A and the second column of the second microlens array 104B in the second optical transmission array.

[0116] For the second wavelength selective switch, the optical signals emitted from the M input ports always propagate along the optical axis direction z in the dispersion direction, and sequentially pass through the first microlens array 101B, the second part 102A2 in 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 in the third conversion unit 102B4, the third conversion lens 102B5, the virtual surface L, and the fourth conversion lens 102C1, and diffract after reaching the grating 102C2. The diffraction equation of the grating 102C2 is as follows:

[0117] nΛ(sinθ i ±sinθ d )=±mλ

[0118] Where n is the effective refractive index of the grating, Λ is the grating period, θ i and θ d are the incident angle and the diffraction angle respectively, m is the diffraction order, and λ is the diffraction wavelength. In some embodiments, the grating is a blazed grating, and there is only +1 or -1 diffraction order.

[0119] After the incident light signal is incident on the grating 102C2, different sub-light signals are diffracted according to the diffraction equation, and after being deflected at different angles, they pass through the fifth transformation lens 102C3 and vertically incident on the corresponding area on the first spatial light modulator 103. In some embodiments, the first spatial light modulator 103 is LCOS or PI-LCOS, and its simplified diffraction equation is:

[0120] dsinθ d =λ

[0121] Where d is the phase period of LCOS, θ d is the diffraction angle, and λ is the diffraction wavelength.

[0122] After being switched by the first spatial light modulator 103, different sub-light signals are transmitted through the fifth transformation lens 102C3 to the grating 102C2, and then synthesized into a light signal containing multiple sub-light signal wavelengths. Finally, they pass through the fourth transformation lens 102C1, the virtual surface L, the third transformation lens 102B5, the third part 102B4-1 in the third transformation unit 102B4, the second transformation lens 102B3, and the second transformation unit 102B2 along the optical axis, and are 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, they are coupled to the second column 104.2 of the second optical fiber array 104A in the second optical transmission array 104.

[0123] Fig.17 FIG. 1 shows a schematic diagram of the principle of a first wavelength selective switch in the dispersion direction provided by an embodiment of the present application. In some embodiments, for example, Fig.16 As shown, the first part 102A1 in the separation element (first conversion unit) 102A and the fourth part 102B4-2 in the third conversion unit 102B4 are optical wedges, which are used to make the incident light signal deviate from the optical axis in the dispersion direction and then deflect 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 optical fiber array 104A and the first column of the second microlens array 104B in the second optical transmission array.

[0124] For the first wavelength selective switch, the optical signals emitted from the M input ports sequentially pass through the first microlens array 101B and the first part 102A1 of the separation element (first conversion unit) 102A, and the propagation direction deviates from the optical axis by a certain angle β. After passing through the first conversion lens 102B1, a light beam parallel to the optical axis is emitted, and is offset from the optical axis by a certain distance h. Then, after passing through the second conversion unit 102B2 and the second conversion lens 102B3, the optical signal is emitted at an angle of 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 is diffracted. After passing through the fifth transformation lens 102C3, it is vertically incident on the corresponding area on the first spatial light modulator 103.

[0125] After being switched by the first spatial light modulator 103, different sub-light signals are transmitted to the grating 102C2 through the fifth transformation lens 102C3 and synthesized into a light signal containing multiple wavelengths of sub-light signals. Finally, they pass through the fourth transformation lens 102C1, the virtual surface L, the third transformation lens 102B5, and the fourth part 102B4-2 in the third transformation unit 102B4 in sequence along the optical axis, and the emitted light has an angle of 1020 with respect to the optical axis. The light beam, after passing through the second transformation lens 102B3, emits an optical signal parallel to the optical axis and offset from the optical axis by a distance h, and is transmitted to the first column control area 105.1 of the second spatial light modulator 105 after passing through the second transformation unit 102B2. 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 optical fiber array 104A in the second optical transmission array 104.

[0126] An embodiment of the present application further provides an optical network device, which includes the wavelength selection switch device described in any of the above embodiments.

[0127] In some embodiments, the optical network device includes but is not limited to a reconfigurable optical add / drop multiplexer ROADM or an optical cross-connector OXC constructed based on the above-mentioned wavelength selective switch device.

[0128] The present application has disclosed example embodiments, and although specific terms are used, they are only used and should only be interpreted as general illustrative meanings, and not for limiting purposes. In some instances, it will be apparent to those skilled in the art that, unless otherwise expressly indicated, features, characteristics, and / or elements described in conjunction with a particular embodiment may be used alone, or in combination with features, characteristics, and / or elements described in conjunction with other embodiments. Therefore, it will be understood by those skilled in the art that various changes in form and detail may be made without departing from the scope of the present application as set forth in the appended claims.

Claims

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

2. The wavelength selective switch device according to claim 1, wherein: The first light transmission array includes a first optical fiber array and a first microlens array; The first optical fiber array includes optical fibers arranged in a one-to-one correspondence with the input ports, and the first microlens array includes microlens units arranged in a one-to-one correspondence with the optical fibers. The microlens units are configured to perform spot transformation on optical signals output via corresponding optical fibers and output them to the beam separation element.

3. The wavelength selective switch device according to claim 1, wherein: The beam separation element comprises a separation element, a light path guiding element and a dispersion element which are sequentially arranged along the optical axis direction; The separation element is configured to separate a first optical signal from an input port of the first wavelength selective switch and a second optical signal from an input port of the second wavelength selective switch in a dispersion direction, and the first optical signal and the second optical signal separated in the dispersion direction are transmitted to the optical path guiding element along an optical axis direction, and 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 dispersion element is configured to disperse and decompose the optical signal corresponding to each input port into a plurality of sub-optical signals of different wavelengths in a dispersion direction, and transmit 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 along the optical axis direction to corresponding different regions on the first spatial light modulator respectively; The dispersion element is further configured to synthesize a plurality of 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 be transmitted to the optical path guiding element; The optical path guiding element is further configured to guide the third optical signal to be transmitted through the separation element and then be transmitted to a corresponding output port in the second optical transmission array.

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

5. The wavelength selective switch 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 switch device according to claim 3, wherein: The optical path guiding element comprises: a first conversion lens, 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 area of ​​the second conversion unit; A second conversion unit, 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; A second transformation lens is used to adjust the light propagation direction of the incident light signal so that the light signal emitted from the second transformation lens is transmitted to the third transformation unit along the optical axis direction; a third conversion unit, comprising a third part and a fourth part sequentially arranged 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 is used to transmit the corresponding incident light signal to the third conversion lens; The third transformation lens is used to transform the light spot of the light signal deflected along the dispersion direction and transmit the light signal not deflected along the dispersion direction.

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

8. The wavelength selective switch 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 switch device according to claim 3, wherein: The dispersion element comprises a fourth transformation lens, a grating and a fifth transformation lens which are sequentially arranged along the optical axis direction; a fourth transform lens, used for adjusting the light propagation direction of the incident light signal so that the light signal emitted from the fourth transform lens is focused on the grating; The grating is used to disperse and decompose the optical signal from each input port into a plurality of sub-optical signals of different wavelengths in the dispersion direction, and transmit the sub-optical signals 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 to the corresponding area on the first spatial light modulator along the optical axis direction.

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

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

12. The wavelength selective switch device according to claim 11, wherein: The first region includes a plurality of rows of first sub-regions sequentially arranged along the switching direction, and the number of rows of the first sub-regions is equal to the number of corresponding input ports of the first wavelength selective switch; the second region includes a plurality of rows of second sub-regions sequentially arranged along the switching direction, and the number of rows of the second sub-regions is equal to the number of corresponding input ports of the second wavelength selective switch; The plurality of sub-optical signals corresponding to the first optical signal from the input port of the first wavelength selective switch emitted from the beam splitting element are correspondingly transmitted to a row of first sub-areas, and each row of first sub-areas correspondingly receives a plurality of sub-optical signals corresponding to the first optical signal from an input port of the first wavelength selective switch; A plurality of sub-optical signals corresponding to the second optical signal from the input port of the second wavelength selective switch emitted from the beam separation element are correspondingly transmitted to a row of second sub-areas, and each row of second sub-areas correspondingly receives a plurality of sub-optical signals corresponding to the second optical signal from an input port of the second wavelength selective switch.

13. The wavelength selective switch device according to claim 1, wherein: The wavelength selective switch device further comprises a second spatial light modulator; The beam splitting element is further configured to guide the third optical signal to be transmitted to a corresponding area on the second spatial light modulator; The second spatial light modulator is configured to receive the third optical signal corresponding to each of the input ports and adjust the optical propagation direction of the third optical signal to transmit the third optical signal in the corresponding area on the second spatial light modulator to the output port corresponding to the second optical transmission array.

14. The wavelength selective switch device according to claim 13, wherein: The second spatial light modulator includes two columns of control areas, each column of control areas includes at least two control areas, one column of control areas corresponds to the output port of the first wavelength selective switch, and the other column of control areas corresponds to the output port of the second wavelength selective switch, and each control area 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 device according to claim 13, wherein: The second light transmission array includes a second optical fiber array and a second microlens array; The second optical fiber array includes optical fibers arranged in a one-to-one correspondence with the output ports, and the second microlens array includes microlens units arranged in a one-to-one correspondence 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 the wavelength selective switch device according to any one of claims 1 to 15.

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