CN119966566A - Wavelength selective switch device and optical network device - Google Patents
Wavelength selective switch device and optical network device Download PDFInfo
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Abstract
本申请提出一种波长选择开关装置及光网络器件，包括：第一光传输阵列，具有第一波长选择开关的至少两个输入端口和第二波长选择开关的至少两个输入端口；光束分离元件，被配置为将第一光信号和第二光信号在色散方向上分离，将每个光信号在色散方向上进行色散分解为不同波长的多个子光信号；第一空间光调制器，被配置为接收输入端口对应的不同波长的多个子光信号，并对子光信号的光传播方向进行调整；光束分离元件还被配置为将输出端口对应的多个子光信号合成为第三光信号，并引导传输至对应的输出端口；第二光传输阵列，具有两列输出端口，一列输出端口为第一波长选择开关的输出端口，另一列输出端口为第二波长选择开关的输出端口。
The present application proposes a wavelength selective switch device and an optical network device, comprising: a first optical transmission array, having 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 separation element, configured to separate a first optical signal and a second optical signal in a dispersion direction, and to disperse and decompose each optical signal in the dispersion direction into a plurality of sub-optical signals of different wavelengths; a first spatial light modulator, configured to receive a plurality of sub-optical signals of different wavelengths corresponding to the input port, and to adjust the optical propagation direction of the sub-optical signals; the beam separation element is further configured to synthesize a plurality of sub-optical signals corresponding to an output port into a third optical signal, and guide the signal to be transmitted to the corresponding output port; a second optical transmission array, having two columns of output ports, one column of output ports being the output ports of the first wavelength selective switch, and the other column of output ports being the output ports of the second wavelength selective switch.
Description
Technical Field
The present application relates to the field of optical fiber communications, and in particular, to a wavelength selective switching device and an optical network device.
Background
In recent years, with the rise of short video, cloud computing, and artificial intelligence large language models (Large Language Model AI, abbreviated as LLM AI), data traffic in networks is undergoing exponential growth, and the demand for adding and dropping traffic wavelengths to and from ROADM (Reconfigurable Optical Add-Drop Multiplexer) nodes is increasing.
The wavelength selective switch (WAVELENGTH SELECTIVE SWITCH, WSS) is used as a core element of the ROADM node, can dynamically operate optical signals in the optical spectrum domain and space, remarkably improves the intelligence, flexibility and reliability of the network, and is a key for realizing the all-optical intelligent network.
In some related art, ROADM nodes need to implement wavelength add-drop simultaneously, so the actual needed add-drop WSS is a Twin structure, i.e., one WSS device contains two WSSs, WSS1 for wavelength add-drop and WSS2 for wavelength drop. The input optical paths and the output optical paths of the two WSSs are independently arranged, which causes problems of increased device size, increased adjustment complexity and time, and the disadvantages of the MxN WSSs of the Twin structure cause the cost rise of the MxN WSSs of the Twin structure, and influence the large-scale deployment of the MxN WSSs at a ROADM node.
Disclosure of Invention
The application provides a wavelength selective switch device and an optical network device.
An embodiment of the present application provides a wavelength selective switching device, including:
A first optical transmission array having a plurality of input ports arranged in 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;
A beam splitting element configured to split 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 perform dispersion decomposition on an optical signal corresponding to each input port in the dispersion direction into a plurality of sub-optical signals of different wavelengths, the switching direction being 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 transmitted to different areas corresponding to a first spatial light modulator, respectively;
the first spatial light modulator is configured to receive a plurality of sub-optical signals with different wavelengths corresponding to the input port, and adjust the optical propagation direction of the sub-optical signals so as to guide and transmit the sub-optical signals to the beam splitting element;
The beam splitting element is further configured to combine a plurality of sub-optical signals with different wavelengths corresponding to the input port emitted from the first spatial light modulator into a third optical signal, and guide and transmit the third optical signal to a corresponding output port in the second optical transmission array;
The second optical transmission array is provided with a plurality of output ports arranged along the switching direction, the plurality of output ports are configured into two columns of output ports, each column of output ports comprises at least two output ports, 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.
The embodiment of the application also provides an optical network device comprising the wavelength selective switch device provided by the embodiment of the application.
According to the wavelength selective switch device and the optical network device provided by the embodiment of the application, the optical signals of the two wavelength selective switches can be separated in the dispersion direction through the beam separation element, and the modulation switching is carried out through the first spatial light modulator, so that the first wavelength selective switch and the second wavelength selective switch can spatially realize the Twain structure, the two wavelength selective switches can multiplex the input/output optical paths, the space of one input/output optical path is saved, the cost of one input/output optical path element is saved, only one wavelength selective switch is required to be aligned during the modulation, the other wavelength selective switch can be automatically aligned, the problems of complex wavelength selective switch modulation of the Twain structure and long time consumption in the related technology are effectively solved, and the large-scale deployment of the wavelength selective switch of the Twain structure at a ROADM node is facilitated.
With respect to the above embodiments and other aspects of the application and implementations thereof, further description is provided in the accompanying drawings, detailed description and claims.
Drawings
In the drawings of embodiments of the application:
fig. 1 shows a schematic architecture diagram of a ROADM node in the related art.
Fig. 2 shows a schematic diagram of a spot on LCOS in a 1xN WSS in the related art.
Fig. 3 shows a schematic architecture of a CDC-ROADM node in the related art.
Fig. 4 shows a schematic diagram of a spot on LCOS in an MxN WSS in the related art.
Fig. 5 is a schematic diagram showing a composition structure of a wavelength selective switch device according to an embodiment of the present application.
Fig. 6 is a schematic diagram showing a composition structure of a first optical transmission array according to an embodiment of the present application.
Fig. 7 is a schematic diagram showing a composition structure of a beam splitter according to an embodiment of the present application.
Fig. 8 is a schematic diagram showing the composition and structure of a separating element according to an embodiment of the present application.
Fig. 9 is a schematic diagram showing the constitution of an optical path guiding element according to an embodiment of the present application.
Fig. 10 is a schematic diagram showing a composition structure of a dispersive element according to an embodiment of the present application.
Fig. 11 is a schematic diagram showing a composition structure of a first spatial light modulator according to an embodiment of the present application.
Fig. 12 is a schematic diagram showing the composition structure of another wavelength selective switch device according to an embodiment of the present application.
Fig. 13 is a schematic diagram showing a composition structure of a second spatial light modulator according to an embodiment of the present application.
Fig. 14 is a schematic diagram showing a composition structure of a second optical transmission array according to an embodiment of the present application.
Fig. 15 is a schematic diagram of a wavelength switching principle of a wavelength selective switch device in a switching direction according to an embodiment of the present application.
Fig. 16 is a schematic diagram of a second wavelength selective switch in a dispersion direction according to an embodiment of the present application.
Fig. 17 is a schematic diagram of a first wavelength selective switch in a dispersion direction according to an embodiment of the present application.
Detailed Description
For a better understanding of the technical solution of the present application, the following detailed description of the embodiments of the present application is provided with reference to the accompanying drawings.
The present application will be described more fully hereinafter with reference to the accompanying drawings, in which embodiments shown may be embodied in different forms, and the application should not be construed as being limited to the embodiments set forth below. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the application to those skilled in the art.
The accompanying drawings, which are included to provide a further understanding of embodiments of the application and are incorporated in and constitute a part of this specification, illustrate the application and together with the detailed embodiment serve to explain the application. The above and other features and advantages will become more readily apparent to those skilled in the art from the description of the detailed embodiments with reference to the accompanying drawings.
The application may be described with reference to plan and/or cross-sectional views by way of an idealized schematic of the application. Accordingly, the example illustrations may be modified in accordance with manufacturing techniques and/or tolerances.
The embodiments of the application and features of the embodiments may be combined with each other without conflict.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but does not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and/or groups thereof.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and the present application and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In some related technologies, ROADM nodes implement wavelength add-drop based on 1×n WSS back-to-back connections, as shown in fig. 1, optionally, taking the 4x4 dimension of the line side as an example, 81×5 WSS networks (MESH) are required for the line side, 21×4WSS back-to-back connections are required for the drop side to implement scheduling of drop wavelengths, and 41×16Sp (Splitter) drops are connected. Optionally, additional identical elements are required to realize the lower path side 1:1 protection, and the upper path side needs 41 min 16Cp (Coupler) up waves, and then the scheduling of the upper path wavelength is realized through 2 1X4WSS back-to-back connections. Optionally, additional identical elements are required to achieve the upstream 1:1 protection. Because the optical signals of all ports are determined to have only one line of light spots on the liquid crystal on silicon LCOS (Liquid Crystal on Silicon) after the optical signals are subjected to grating dispersion expansion based on 1×n WSS interconnection, only 120 wavelengths (λ) of one band can be processed, the 120 wavelengths are sequentially arranged on the LCOS, and each wavelength can only cover one determined area, as shown in fig. 2. Alternatively, the wavelength band processed by the WSS may be a C-band, an L-band, an S-band, a c+l-band, or the like. Therefore, if the same-frequency wavelength exists for both the uplink and the downlink, the ROADM node cannot process, i.e., there is a wavelength Contention (content).
In some related art CDC-ROADM (Colorless, directionless, contentionless Reconfigurable Optical Add-Drop Multiplexer) node architecture is shown in fig. 3, where MxN WSS is designed to have multiple COM ports (Communication Port, serial communication interface), M optical signals are transmitted and transformed by an optical system, M lines of light spots are covered on LCOS, and M areas covered by the same-frequency wavelengths exist at the same time, as shown in fig. 4. Therefore, M same-frequency wavelengths can be processed simultaneously, and wavelength unobstructed (Contentionless) up-and-down paths are realized. Alternatively, as shown in fig. 3, taking the line side 4x4 dimension as an example, the uplink and downlink side performs uplink and downlink waves through the Twin structure 4x16WSS, and the ROADM node can process 4 same-frequency wavelengths simultaneously. Alternatively, the Twin structure 8x24WSS is used for up-and-down waves, and the ROADM node can process 8 co-frequency wavelengths simultaneously. Here, the number of M and N is not particularly limited only for illustrating the architecture of ROADM nodes in the related art.
As described above, ROADM sites need to implement wavelength add-drop simultaneously, so the actual required add-drop WSS is a Twin structure, i.e. one WSS device contains two WSSs, WSS1 for wavelength add-drop and WSS2 for wavelength drop. In the related art, the input/output optical paths of two WSSs are independent, which causes problems of increased device size, increased modulation complexity and time, and the disadvantages of the prior art cause the cost of the Twin structure MxN WSS to be increased, thereby affecting the large-scale deployment of the Twin structure MxN WSS at a ROADM node.
The embodiment of the application provides a wavelength selective switch device and an optical network device, which aim to effectively improve the technical problems in the related art.
Referring to fig. 5, fig. 5 is a schematic diagram showing the composition of a wavelength selective switch device according to an embodiment of the present application, and the embodiment of the present application provides a wavelength selective switch device 100, where the wavelength selective switch device 100 includes, but is not limited to, the following components.
The first optical transmission array 101 has a plurality of input ports in arranged in the switching direction x, the plurality of input ports in including at least two input ports (in 11 to in 1M) of the first wavelength selective switch and at least two input ports (in 21 to in 2M) of the second wavelength selective switch.
The optical beam splitting element 102 is configured to split a first optical signal from an input port (in 11-in 1M) of the first wavelength selective switch and a second optical signal from an input port (in 21-in 2M) of the second wavelength selective switch in a dispersion direction y, and to perform dispersion decomposition on an optical signal corresponding to each input port in the dispersion direction y into a plurality of sub-optical signals with different wavelengths, wherein the switching direction x is perpendicular to the dispersion direction y, and the plurality of sub-optical signals with different wavelengths corresponding to the first optical signal and the plurality of sub-optical signals with different wavelengths corresponding to the second optical signal are respectively transmitted to different regions corresponding to the first spatial light modulator 103.
A 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 optical propagation direction of the sub-optical signals to direct the sub-optical signals to the beam splitting element 102.
The beam splitting element 102 is further configured to combine a plurality of 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 to guide and transmit the third optical signal to a corresponding output port out in the second optical transmission array 104.
The second optical transmission array 104 has a plurality of output ports out arranged along the switching direction x, where the plurality of output ports out are configured as two rows of output ports, each row of output ports includes at least two output ports, one row of output ports (out 11 to out 1N) is an output port of the first wavelength selective switch, and the other row of output ports (out 21 to out 2N) is an output port of the second wavelength selective switch.
In the embodiment of the present application, the first optical transmission array 101/the second optical transmission array 104, the beam splitter 102, and the first spatial light modulator 103 are sequentially arranged along an optical axis direction z, and the optical axis direction z is perpendicular to the switching direction x and the dispersion direction y.
In the embodiment of the present application, the switching direction is defined as the arrangement direction of the input ports, which corresponds to the direction of the illustrated coordinate x, the dispersion direction is defined as the direction in which the dispersed optical signal expands, which corresponds to the direction of the illustrated coordinate y, 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 splitter 102, and the first spatial light modulator 103, which corresponds to the direction of the illustrated coordinate z.
In the embodiment of the present application, the wavelength selective switch device 100 is a wavelength selective switch WSS with a Twin structure, and is suitable for adding and dropping wavelength selective switches (Add-drop WAVELENGTH SELECTIVE SWITCH, ADWSS) for implementing wavelength Add/drop in optical network devices (such as ROADM nodes and optical cross-connect OXCs). The wavelength selective switch device 100 includes a first wavelength selective switch and a second wavelength selective switch, where the first wavelength selective switch and the second wavelength selective switch are MxN WSS, M, N are greater than or equal to 2, M and N are integers, the first wavelength selective switch has at least two input ports (in 11-in 1M) and at least two output ports (out 11-out 1N), and the second wavelength selective switch has at least two input ports (in 21-in 2M) and at least two output ports (out 21-out 2N).
Wherein, at least two input ports (in 11-in 1M) of the first wavelength selective switch and at least two input ports (in 21-in 2M) of the second wavelength selective switch are integrated in the first optical transmission array 101, and in the first optical transmission array 101, at least two input ports (in 11-in 1M) of the first wavelength selective switch and at least two input ports (in 21-in 2M) of the second wavelength selective switch are sequentially arranged at intervals along the switching direction x. In some embodiments, as shown in fig. 5, in the switching direction x, at least two input ports (in 11 to in 1M) of the first wavelength selective switch are sequentially arranged above the optical axis, and at least two input ports (in 21 to in 2M) of the second wavelength selective switch are sequentially arranged below the optical axis.
At least two output ports (out 11-out 1N) of the first wavelength selective switch and at least two output ports (out 21-out 2N) 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 and is provided with two rows of output ports, the at least two output ports (out 11-out 1N) of the first wavelength selective switch are sequentially arranged at intervals along the switching direction x to form a row of output ports, and the at least two output ports (out 21-out 2N) of the second wavelength selective switch are sequentially arranged at intervals along the switching direction x to form a row of output ports. In some embodiments, as shown in fig. 5, the output ports of the first wavelength selective switch and the output ports of the second wavelength selective switch are alternately arranged in sequence in the switching direction x.
In the embodiment of the present application, the input port in of the first optical transmission array 101 is used for receiving/transmitting a corresponding optical signal, and the output port out of the second optical transmission array 101 is used for receiving/transmitting a corresponding optical signal.
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 the optical signal of each input port is decomposed into a plurality of sub-optical signals with different wavelengths in the dispersion direction y, and then transmitted to the corresponding different areas on the first spatial light modulator 103 along the optical axis direction z, and the sub-optical signals corresponding to each input port are switched by the phase modulation of the first spatial light modulator 103, where the switched sub-optical signals can propagate to the beam splitting element 102 along a set angle, and the plurality of sub-optical signals with different wavelengths corresponding to each input port are converged in the beam splitting element 102 to be synthesized into a third optical signal with a plurality of wavelengths, and the third optical signal is guided and propagated to the corresponding output port out in the second optical transmission array 101 through the beam splitting element 102. In this way, the optical signals of the two wavelength selective switches can be separated in the dispersion direction by the beam splitting element 102, and modulation switching is performed by the first spatial light modulator 103, so that the first wavelength selective switch and the second wavelength selective switch can spatially realize the Twin structure, the two wavelength selective switches can multiplex the input/output optical paths, the space of one input/output optical path is saved, the cost of one input/output optical path element is saved, only one wavelength selective switch is required to be aligned during modulation, the other wavelength selective switch can be automatically aligned, the problems that the wavelength selective switch of the Twin structure in the related art is complex in modulation and time-consuming are effectively improved, and the large-scale deployment of the wavelength selective switch of the Twin structure at a ROADM node is facilitated.
According to the wavelength selective switch device provided by the embodiment of the application, the optical signals of the two wavelength selective switches can be separated in the dispersion direction through the beam separation element and are modulated and switched through the first spatial light modulator, so that the first wavelength selective switch and the second wavelength selective switch can spatially realize a Twain structure, the two wavelength selective switches can multiplex input/output optical paths, the space of one input/output optical path is saved, the cost of one input/output optical path element is saved, only one wavelength selective switch is required to be aligned during the modulation, the other wavelength selective switch can be automatically aligned, the problems that the wavelength selective switch of the Twain structure is complex to modulate and time-consuming in the related technology are effectively solved, and the large-scale deployment of the wavelength selective switch of the Twain structure at a ROADM node is facilitated.
Fig. 6 shows a schematic structural diagram of a first optical transmission array according to an embodiment of the present application, in some embodiments, as shown in fig. 6, the first optical transmission array 101 includes a first optical fiber array 101A and a first micro lens array 101B, where the first optical fiber array 101A and the first micro lens array 101B are packaged in the same device, the first optical fiber array 101A includes optical fibers disposed in a one-to-one correspondence with input ports (in 11-in 1M, in-in 2M), each optical fiber may be connected to a corresponding light source, the light source inputs a corresponding optical signal through the corresponding optical fiber, the first micro lens array 101B includes a micro lens unit 101B1 disposed in a one-to-one correspondence with the optical fiber, and the micro lens unit 101B1 is configured to perform spot conversion on the optical signal output through the corresponding optical fiber and output the optical signal to the beam splitting element 102.
Fig. 7 shows a schematic structural diagram of a beam splitting element provided in an embodiment of the present application, in some embodiments, as shown in fig. 7, the beam splitting element 102 includes a splitting element 102A, an optical path guiding element 102B and a dispersing element 102C sequentially arranged along an optical axis direction, where the splitting element 102A is configured to split a first optical signal from an input port (in 11-in 1M) of a first wavelength selective switch and a second optical signal from an input port (in 21-in 2M) of a second wavelength selective switch in a dispersing direction y, the first optical signal and the second optical signal split in the dispersing direction y are transmitted to the optical path guiding element 102B along the optical axis direction z, the optical path guiding element 102B is configured to guide an optical signal corresponding to each input port to the dispersing element 102C along the optical axis direction, the dispersing element 102C is configured to disperse and decompose the optical signal corresponding to each input port in the dispersing direction y into a plurality of sub-optical signals of different wavelengths, and to transmit the plurality of sub-optical signals corresponding to the first optical signal and the plurality of sub-optical signals corresponding to the different wavelengths respectively to the second wavelength selective switch (in 21-in 2M), the optical signal is further configured to transmit the optical signal to the optical modulator 102B from the first optical path guiding element 103 to the optical signal corresponding to the third optical sub-optical input element 102B along the third optical axis direction, and the optical signal is further configured to transmit the optical signal corresponding to the third optical sub-optical signal corresponding to the third optical sub-optical splitter element 102B is transmitted to the third optical splitter element 102B.
Fig. 8 shows a schematic structural diagram of a separating element according to an embodiment of the present application, in some embodiments, as shown in fig. 8, a separating element 102A includes a first conversion unit, where the first conversion unit includes a first portion 102A1 and a second portion 102A2 sequentially disposed along a switching direction x, that is, the first conversion unit is divided into an upper portion and a lower portion along a plane yoz where an optical axis is located in space, the upper portion is the first portion 102A1, and the lower portion is the second portion 102A2.
One of the first portion 102A1 and the second portion 102A2 is disposed corresponding to an input port (in 11-in 1M) of the first wavelength selective switch, the other is disposed corresponding to an input port (in 21-in 2M) of the second wavelength selective switch, and one of the first portion 102A1 and the second portion 102A2 is used for deflecting a light propagation direction of a corresponding incident light signal along a dispersion direction y, and the other is used for transmitting the corresponding incident light signal.
In some embodiments, the first portion 102A1 is disposed corresponding to the input port (in 11-in 1M) of the first wavelength selective switch, the second portion 102A2 is disposed corresponding to the input port (in 21-in 2M) of the second wavelength selective switch, the first optical signal exiting through the input port (in 11-in 1M) of the first wavelength selective switch is incident on the first portion 102A1 of the separating element 102A along the optical axis direction, the first portion 102A1 deflects the optical propagation direction of the first optical signal from the input port (in 21-in 2M) of the first wavelength selective switch along the dispersion direction y, the first optical signal exiting from the first portion 102A1 is transmitted to the optical path guiding element 102B along the optical axis direction, the second optical signal exiting through the input port (in 21-in 2M) of the second wavelength selective switch is incident on the second portion 102A2 of the separating element 102A along the optical axis direction, the second optical signal from the input port of the second wavelength selective switch is transmitted by the second portion 102A2 along the second optical path guiding element 102B along the optical axis direction.
Regarding the case where the first portion 102A1 is disposed corresponding to the input port (in 21-in 2M) of the second wavelength selective switch, and the second portion 102A2 is disposed corresponding to the input port (in 11-in 1M) of the first wavelength selective switch, reference may be made to the description in the case where the first portion 102A1 is disposed corresponding to the input port (in 11-in 1M) of the first wavelength selective switch, and the second portion 102A2 is disposed corresponding to the input port (in 21-in 2M) of the second wavelength selective switch, which will not be repeated herein.
In some embodiments, in the first conversion 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.
It should be noted that, the specific implementation form of the first conversion unit is not particularly limited in the embodiment of the present application, and any element that can be used to separate the optical signals of the input ports of the two wavelength selective switches in the dispersion direction y is within the protection scope of the embodiment of the present application.
Fig. 9 shows a schematic diagram of a composition structure of an optical path guiding element according to an embodiment of the present application, in some embodiments, as shown in fig. 9, in the beam splitting element 102, the optical path guiding element 102B includes a first conversion lens 102B1, a second conversion unit 102B2, a second conversion lens 102B3, a third conversion unit 102B4, and a third conversion lens 102B5 sequentially arranged along an optical axis direction z.
The optical fiber optical system comprises a first conversion lens 102B1, a second conversion unit 102B2, a second conversion lens 102B3, a third conversion unit 102B4, a third conversion lens 102B4, a third conversion element 102B4, a fourth conversion element 102B4, a third conversion element 102B4-1 and a fourth conversion element 102B2, wherein the first conversion lens 102B1 is used for adjusting the light propagation direction of an optical signal from a separating element 102A so that the optical signal emitted from the first conversion lens 102B1 is focused on the middle area of the second conversion element 102B2, one of the third conversion element 102B2 and the fourth conversion element 102B2 is used for adjusting the light propagation direction of the optical signal emitted from the second conversion element 102B2 to enable the optical signal emitted from the second conversion element to be transmitted to the second conversion element 102B3 along the optical axis direction z, one of the third conversion element 102B4-1 and the fourth conversion element 102B4-2 is used for deflecting the light propagation direction of the corresponding incident optical signal along the incident direction y, the second conversion element 102B3 is used for transmitting the optical signal along the direction y, the other conversion element is used for transmitting the light signal along the direction y, and the third conversion element is used for transmitting the light signal along the direction C and the second conversion element is used for transmitting the light signal along the direction y, and the third conversion element is used for transmitting the light signal along the direction y, and the second conversion element is used for transmitting the light along the direction is used for transmitting the direction along the direction y, and the direction is used for transmitting the light signal along the direction is used for transmitting the light direction and the light direction is used for the light direction and is used for transmitting to be along the light direction and is used for the light direction and for the light transmission and for the light direction.
In some embodiments, the lens surface shape of the first conversion lens 102B1 includes, but is not limited to, a spherical surface for achieving an exit position/angle conversion of an incident optical signal.
In some embodiments, the second conversion unit 102B2 may be a multi-functional mirror for enabling selection of the incident light signal to be reflected in the middle region and transmitted in the edge region. The second conversion unit 102B2 includes an upper region, a middle region, and a lower region sequentially disposed along the switching direction, where the upper region includes a first transmissive element, the middle region includes a reflective element, and the lower region includes a second transmissive element, or the upper region includes a first reflective element, the middle region includes a transmissive element, and the lower region includes a second reflective element.
In some embodiments, the lens surface shape of the second conversion lens 102B3 includes, but is not limited to, a spherical surface for achieving an exit position/angle conversion of an incident optical signal.
In some embodiments, the third portion 102B4-1 of the third conversion unit 102B4 is configured to transmit a corresponding incoming optical signal when the first portion 102A1 of the separation element 102A is configured to deflect the optical propagation direction of the incoming optical signal in the dispersion direction y, and the third portion 102B4-1 of the third conversion unit 102B4 is configured to deflect the optical propagation direction of the incoming optical signal in the dispersion direction y when the first portion 102A1 of the separation element 102A is configured to transmit a corresponding incoming optical signal.
In some embodiments, in the third transformation unit 102B4, the third portion 102B4-1 is a glass plate, the fourth portion 102B4-2 is an optical wedge, or the third portion 102B4-1 is an optical wedge, and the fourth portion 102B4-2 is a glass plate. Therefore, the deflection of the incident part of optical signals in the dispersion direction y is realized, and the other part of optical signals are directly transmitted, so that different optical signals are separated in the dispersion direction y.
In some embodiments, the lens profile of the third conversion lens 102B5 includes, but is not limited to, a cylindrical surface disposed along the dispersion direction y for effecting spot conversion of the incident optical signal in the dispersion direction y.
In some embodiments, in the direction in which the optical signals are transmitted from the input port in to the first spatial light modulator 103, the first optical signal from the input port (in 11 to in 1M) of the first wavelength selective switch and the second optical signal from the input port (in 21 to in 2M) of the second wavelength selective switch are transmitted to the separation element 102A along the optical axis direction z, and then separated in the dispersion direction y by the separation element 102A, and are emitted from the separation element 102A and transmitted to the optical path guiding element 102B along the optical axis direction z after being separated; in the optical path guiding element 102B, the optical path guiding element is focused on the middle area of the second conversion unit 102B2 after being subjected to position/angle conversion adjustment by the first conversion lens 102B1, the optical path guiding element is transmitted to the second conversion lens 102B3 along the direction of incidence of the second conversion unit 102B2 after being subjected to position/angle conversion adjustment by the second conversion unit 102B2, the optical path guiding element is transmitted to the third conversion unit 102B4 along the optical axis direction z after being subjected to position/angle conversion adjustment by the second conversion lens 102B3, wherein the first optical signal is transmitted to the third part 102B4-1 of the third conversion unit 102B4, the second optical signal is transmitted to the fourth part 102B4-2 of the third conversion unit 102B4, or the first optical signal is transmitted to the third part 102B4-1 of the third conversion unit, the second optical signal is transmitted by the third part 102B4-2, the optical signal corresponding to the optical signal is transmitted in the optical axis direction z, the optical signal corresponding to the optical signal is dispersed in the direction of propagation in the direction of the optical axis direction y, the optical signal corresponding to the optical signal is dispersed in the direction of the optical path guiding element, and the optical path guiding element is dispersed in the optical path direction, the fourth portion 102B4-2 transmits the light signal corresponding to the incidence, and then the light signal emitted from the third conversion unit 1024B is transmitted through the third conversion lens 102B5 and transmitted to the dispersive element 102C along the optical axis direction z.
In some embodiments, in the direction in which the optical signal is transmitted from the first spatial light modulator 103 to the output port out, after the first spatial light modulator 103 performs angle switching on a plurality of sub-optical signals with different wavelengths corresponding to each input port in, the sub-optical signals with different wavelengths corresponding to each input port in are incident to the dispersive element 102C along a set angle, are converged and synthesized into a corresponding third optical signal under the action of the dispersive element 102C, and the third optical signal is guided and transmitted to the optical path guiding element 102B through the dispersive element 102C, and 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 subjected to angle conversion adjustment or transmission through each unit and lens in the optical path guiding element 102B.
Fig. 10 is a schematic diagram showing a composition structure of a dispersive element according to an embodiment of the present application, and in some embodiments, as shown in fig. 10, the dispersive element 102C includes a fourth conversion lens 102C1, a grating 102C2, and a fifth conversion lens 102C3 sequentially arranged along the optical axis direction z.
The optical signal output from the fourth conversion lens 102C1 is focused on the grating 102C 2by adjusting the optical propagation direction of the incident optical signal, the grating 102C2 is used for performing dispersion decomposition on the optical signal from each input port in the dispersion direction y into a plurality of sub-optical signals with different wavelengths and transmitting the sub-optical signals to the fifth conversion lens 102C3, and the fifth conversion lens 102C3 is used for adjusting the optical propagation direction of the incident sub-optical signals so that the sub-optical signals output from the fifth conversion lens 102C3 are transmitted to corresponding areas on the first spatial light modulator 103 along the optical axis direction z.
In some embodiments, grating 102C2 includes, but is not limited to, a prismatic grating or a blazed grating for enabling decomposition and synthesis of the optical signal.
It will be appreciated 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 manner, so that the optical path of the wavelength selective switch repeatedly passes through the grating 102C2 of the dispersive element 102C twice, and the same grating 102C2 is multiplexed twice.
Taking an input port of the first wavelength selective switch as an example, a first optical signal emitted from the input port of the first wavelength selective switch is deflected in a dispersion direction y by the separating element 102A, is guided and transmitted to the dispersive element 102C by the optical path guiding element 102B, is subjected to angle conversion adjustment by the fourth conversion lens 102C1 in the dispersive element 102C, is focused on the grating 102C2, is subjected to dispersion decomposition into a plurality of sub-optical signals with different wavelengths by the grating 102C2, is subjected to angle conversion adjustment by the fifth conversion lens 102C3, and is propagated to a corresponding region on the first spatial light modulator 103 along an optical axis direction z, and in this process, the optical signal is first passed through the grating 102C2 of the dispersive element 102C.
Sub-optical signals with different wavelengths corresponding to the input port of the first wavelength selective switch are subjected to angle switching through the first spatial light modulator 103, then are incident to the dispersive element 102C at a set angle, are transmitted to the grating 102C2 after being subjected to angle conversion adjustment through the fifth conversion lens 102C3 in the dispersive element 102C, are converged into a third optical signal containing a plurality of wavelengths under the action of the grating 102C2, are subjected to angle conversion adjustment through the fourth conversion lens 102C1 after being emitted from the grating 102C2, and are transmitted to the optical path guiding element 102B, and in the process, the optical signal is subjected to the grating 102C2 of the dispersive element 102C for the second time, and the grating 102C2 subjected to the first time and the grating 102C2 subjected to the second time are identical gratings.
In some embodiments, the lens surface shape of the fourth conversion lens 102C1 includes, but is not limited to, a spherical surface for achieving an exit position/angle conversion of an incident optical signal.
In some embodiments, the lens surface shape of the fifth conversion lens 102C3 includes, but is not limited to, a spherical surface for achieving an exit position/angle conversion of an incident optical signal.
In some embodiments, in the optical axis direction z, other compensation elements may be disposed before and after the fourth conversion lens 102C1 or the fifth conversion lens 102C3, and the other compensation elements may be optical wedges without optical power, polarization conversion elements, or lenses with optical power, and the surface shape is not limited to a spherical surface. It will be appreciated that in the optical paths of the first wavelength selective switch and the second wavelength selective switch, the embodiments of the present application employ a folded optical path manner such that the optical paths of the wavelength selective switches repeatedly pass through the fourth conversion lens 102C1 and the fifth conversion lens 102C3 several times, and the fourth conversion lens 102C1 and the fifth conversion lens 102C3 are multiplexed lenses or lens groups.
It should be noted that, the embodiment of the present application is not particularly limited to the specific implementation form of the various constituent elements in the beam splitter 102, as long as the desired optical function can be achieved.
Fig. 11 is a schematic diagram showing a composition structure of a first spatial light modulator according to an embodiment of the present application, in some embodiments, as shown in fig. 11, the first spatial light modulator 103 includes a first area 103A and a second area 103B divided along a switching direction x, that is, the first spatial light modulator 103 is divided into an upper half area and a lower half area along a plane yoz in space, where the upper half area is the first area 103A, and the lower half area is the second area 103B.
Wherein the first region 103A is configured to receive a plurality of sub-optical signals corresponding to different wavelengths of the first optical signal and to adjust the optical propagation direction of the received sub-optical signals, and the second region 103B is configured to receive a plurality of sub-optical signals corresponding to different wavelengths of the second optical signal and to adjust the optical propagation direction of the received sub-optical signals.
In some embodiments, as shown in fig. 11, the first area 103A includes a plurality of rows of first sub-areas 103A1 sequentially arranged along the switching direction x, the number of rows of the first sub-areas 103A1 is equal to the number of input ports (in 11-in 1M) of the corresponding first wavelength selective switch, and 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 (in 21-in 2M) of the corresponding 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, which is emitted from the beam splitter 102, are correspondingly transmitted to a row of first sub-areas 103A1, each row of first sub-areas 103A1 correspondingly receives the plurality of sub-optical signals corresponding to the first optical signal from one input port of the first wavelength selective switch, and the plurality of sub-optical signals corresponding to the first optical signal from each input port of the first wavelength selective switch may form a light spot as shown in fig. 3 in the corresponding row of first sub-areas 103 A1.
The plurality of sub-optical signals corresponding to the second optical signal from the input port of the second wavelength selective switch, which is emitted from the beam splitter 102, are correspondingly transmitted to the row of second sub-areas 103B1, each row of second sub-areas 103B1 correspondingly receives the plurality of sub-optical signals corresponding to the second optical signal from the one input port of the second wavelength selective switch, and the plurality of sub-optical signals corresponding to the first optical signal of each input port of the first wavelength selective switch may form a light spot as shown in fig. 3 in the corresponding row of second sub-areas 103B 1.
In some embodiments, a plurality of sub-optical signals corresponding to the optical signals of each input port exit parallel to the optical axis through the fifth conversion lens 102C3 and vertically enter a corresponding region on the first spatial light modulator to form a corresponding light spot.
In some embodiments, the first spatial light modulator 103 may be a PI-LCOS (Polarization independence Liquid Crystal on Silicon, polarization-independent liquid crystal on silicon), LCOS (Liquid Crystal on Silicon ) or MEMS (Micro-Electro-MECHANICAL SYSTEM, microelectromechanical system) for achieving deflection of the light propagation direction of the light signal.
Fig. 12 shows a schematic diagram of the composition of another wavelength selective switch device according to an embodiment of the present application, and in some embodiments, as shown in fig. 12, the wavelength selective switch device 100 may further include a second Spatial Light Modulator (SLM) 105.
The optical beam splitting element 102 is further configured to combine the multiple sub optical signals with different wavelengths corresponding to each input port output by the first spatial optical modulator 103 into a third optical signal, and guide and transmit the third optical signal to a corresponding area on the second spatial optical modulator 105, and the second spatial optical modulator 105 is configured to receive the third optical signal corresponding to each input port, and adjust an optical propagation direction of the third optical signal to transmit the third optical signal of the corresponding area on the second spatial optical modulator 105 to an output port out corresponding to the second optical transmission array 104.
Fig. 13 is a schematic diagram showing a composition structure of a second spatial light modulator according to an embodiment of the present application, in some embodiments, as shown in fig. 13, the second spatial light modulator 105 includes two rows of control areas 105A, each row of control areas 105A includes at least two control areas 105A, wherein one row of control areas 105A corresponds to output ports (out 11-out 1N) of the first wavelength selective switch, the control areas 105A in the one row of control areas 105A are connected to the output ports (out 21-out 2N) of the first wavelength selective switch in a one-to-one correspondence manner, the control areas 105A in the other row of control areas 105A correspond to the output ports (out 21-out 2N) of the second wavelength selective switch in a one-to-one correspondence manner, and each control area 105A is configured to adjust a light propagation direction of a received third light signal and transmit the third light signal to the corresponding output port.
In some embodiments, the second spatial light modulator 105 may be a PI-LCOS (Polarization independence Liquid Crystal on Silicon, polarization-independent liquid crystal on silicon), LCOS (Liquid Crystal on Silicon ) or MEMS (Micro-Electro-MECHANICAL SYSTEM, microelectromechanical system) for achieving deflection of the light propagation direction of the light signal.
Fig. 14 shows a schematic structural diagram of a second optical transmission array according to an embodiment of the present application, in some embodiments, as shown in fig. 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 arranged in one-to-one correspondence with the output ports (out 11-out 1N, out 21-out 2N), the second microlens array 104B includes microlens units 104B1 arranged in one-to-one correspondence with the optical fibers, and the microlens units 104B1 are configured to perform spot conversion on a third optical signal output by the second spatial light modulator 105 and transmit the third optical signal to the corresponding output port.
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.
In some embodiments, in the opposite direction of the optical axis direction z, a polarization diversity unit and a polarization conversion unit may be further included before the second microlens array 104B.
In the embodiment of the present application, the wavelength selective switch device 100 may be applied to ROADM and Optical Cross-Connect (OXC), or may construct an Optical Cross-Connect node with a higher dimension, which may be widely applied to various scenarios such as backbone networks, metropolitan area networks, access networks, etc., and is applicable to C-band, L-band, c+l-band, s+c+l-band, etc.
Fig. 15 is a schematic diagram illustrating a wavelength switching principle of a wavelength selective switch device in a switching direction according to an embodiment of the present application, in some embodiments, as shown in fig. 15, the wavelength selective switch device includes two MxN wavelength selective switches WSS of a Twin structure, a dashed arrow indicates an optical path of a second wavelength selective switch WSS, a solid arrow indicates an optical path of a first wavelength selective switch WSS, and the switching direction is defined as an arrangement direction of 2M input ports, corresponding to a direction of a coordinate x shown in the drawing. The upper half of fig. 15 shows the optical path of an optical signal input to the first spatial light modulator 103 (e.g., LCOS) through the first optical transmission array 101, and the lower half shows the optical path of an optical signal switched by the first spatial light modulator 103 and then switched by the second spatial light modulator 105 to be output from the second optical transmission array 104.
The optical path may be divided into an input portion and an output portion, wherein the input portion may be divided into an input optical path and a main optical path, an optical signal exits from an input port of the first optical transmission array 101, an optical path transmitted to the virtual plane L via the separation 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 is an input optical path of the input portion, an optical signal exits from the virtual plane L, and an optical path transmitted to the first spatial light modulator 103 via the fourth conversion lens 102C1, the grating 102C2, and the fifth conversion lens 102C3 is a main optical path of the input portion.
The output portion may be split into an output optical path and a main optical path, the optical signal is emitted from the first spatial light modulator 103, the optical path 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 portion, the optical signal is emitted from the virtual surface L, and the optical path 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 portion.
Since the wavelength switching principle of the first wavelength selective switch WSS and the second wavelength selective switch WSS in the switching direction x is completely the same, the paths are also symmetrical about the optical axis, and the switching principle is described below by taking the first wavelength selective switch WSS as an example, and the switching principle of the second wavelength selective switch WSS is the same and will not be repeated here.
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 to transform the gaussian beam having the small beam waist radius into the gaussian beam having the larger beam waist radius, and reduce the divergence angle of the beam. The transformation equation for the gaussian beam is as follows:
where ω1 and ω0 are beam waist radii before and after the gaussian beam transformation, f is an equivalent focal length of the microlens unit, and λ is a wavelength of the gaussian beam. In some embodiments, the beam waist radius may be converted to 100 μm.
M optical signals emitted from different input ports are incident on the first conversion lens 102B1 after passing through the separation element (first conversion unit) 102A, are focused on the middle region of the second conversion unit 102B2 after passing through the first conversion lens 102B1, so that the optical signals focused on the middle region of the second conversion unit 102B2 are reflected and propagated forward to the second conversion lens 102B3, and the optical signals parallel to the optical axis are emitted through the second conversion lens 102B3 and propagated to the virtual surface L after passing through the third conversion unit 102B4 and the third conversion lens 102B 5.
The optical signal passing through the virtual surface L is focused on the grating 102C2 after passing through the fourth conversion 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, and the optical signal exits parallel to the optical axis after passing through the fifth conversion lens 102C3 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 divides the first subregion of M rows, and the optical signal emitted from each input port is dispersed by the grating 102C2 and then decomposed into a plurality of sub-optical signals, and the sub-optical signals are incident to the first subregion of a corresponding row in the first area of the first spatial light modulator 103.
In some embodiments, the first spatial light modulator 103 is an LCOS.
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 spot of the sub-optical signal is located, so as to realize wavelength switching of each sub-optical signal. The switched sub-optical signals sequentially pass through the fifth conversion lens 102C3, the grating 102C2, the fourth conversion lens 102C1, the virtual surface L, and the third conversion unit 102B4, are incident on the second conversion unit 102B2, are transmitted through the second conversion unit 102B2, and are transferred to the corresponding control area in the second spatial light modulator 105, as shown in fig. 13. The voltage is applied to the control area, the propagation angle of the optical signal is converted to be parallel to the optical axis, and the optical signal is coupled to the corresponding output port of the corresponding second optical fiber array 104A after being converted by the second microlens array 104B in the second optical transmission array 104.
In some embodiments, the second spatial light modulator 105 is a MEMS, wherein the pitch of the MEMS mirror may be set to 330 μm.
In some embodiments, the optical power of the second microlens array 104B is the same as or different from the first microlens array 101B.
In the switching direction, since a part of the optical device does not function in the optical path in the output optical path, the part of the optical device is not shown in fig. 15 in the output optical path.
Fig. 16 is a schematic diagram of a second wavelength selective switch in a dispersion direction according to an embodiment of the present application, in some embodiments, as shown in fig. 16, the second portion 102A2 in the separation element (the first conversion unit) 102A and the third portion 102B4-1 in the third conversion unit 102B4 are glass plates for compensating the optical path length, 105.2 represents a second column control area of the second spatial light modulator 105, and 104.2 represents a second column of the second optical fiber array 104A and a second column of the second microlens array 104B in the second optical transmission array.
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 then sequentially pass through the first microlens array 101B, the second portion 102A2 of the separating element (first conversion unit) 102A, the first conversion lens 102B1, the second conversion unit 102B2, the second conversion lens 102B3, the third portion 102B-1 of the third conversion unit 102B4, the third conversion lens 102B5, the virtual surface L, and the fourth conversion lens 102C1, and then, reach the grating 102C2, and then diffract, and the diffraction equation of the grating 102C2 is as follows:
nΛ(sinθi±sinθd)=±mλ
Where n is the effective refractive index of the grating, Λ is the grating period, θ i and θ d are the angle of incidence and diffraction, respectively, m is the diffraction order, and λ is the diffraction wavelength. In some embodiments, the grating is a blazed grating, with only +1 or-1 diffraction orders present.
After the incident light signal is incident on the grating 102C2, the different sub-light signals are diffracted according to a diffraction equation, deflected by different angles, and vertically incident on the corresponding region on the first spatial light modulator 103 through the fifth conversion lens 102C 3. In some embodiments, the first spatial light modulator 103 is an LCOS or PI-LCOS, which simplifies the diffraction equation to:
dsinθd=λ
where d is the phase period of the LCOS, θ d is the diffraction angle, and λ is the diffraction wavelength.
After being switched by the first spatial light modulator 103, the different sub-optical signals are propagated to the grating 102C2 through the fifth conversion lens 102C3, and then synthesized into optical signals containing a plurality of sub-optical signal wavelengths, and finally sequentially pass through the fourth conversion lens 102C1, the virtual surface L, the third conversion lens 102B5, the third part 102B4-1 in the third conversion unit 102B4, the second conversion lens 102B3 and the second conversion unit 102B2 along the optical axis, and then are transferred to the second column control area 105.2 of the second spatial light modulator 105, reflected by the second column control area of the second spatial light modulator 105, and then coupled to the second column 104.2 of the second optical fiber array 104A in the second optical transmission array 104.
Fig. 17 is a schematic diagram of a first wavelength selective switch in a dispersion direction according to an embodiment of the present application, in some embodiments, as shown in fig. 16, a first portion 102A1 of a separation element (a first conversion unit) 102A and a fourth portion 102B4-2 of a third conversion unit 102B4 are optical wedges for deflecting an incident optical signal in the dispersion direction from an optical axis and then deflecting the incident optical signal to the optical axis again, 105.1 represents a first column control region of a second spatial light modulator 105, and 104.1 represents a first column of a second optical fiber array 104A and a first column of a second microlens array 104B in a second optical transmission array.
For the first wavelength selective switch, after the optical signals emitted from the M input ports sequentially pass through the first microlens array 101B and the first portion 102A1 of the separating element (first conversion unit) 102A, the propagation direction deviates from the optical axis by a certain angle β. The light beam parallel to the optical axis is emitted through the first conversion lens 102B1, and is offset from the optical axis by a distance h. Then, after the optical signal sequentially passes through the second conversion unit 102B2 and the second conversion lens 102B3, the included angle between the outgoing light axis and the optical axis isThe outgoing light beam passes through the fourth portion 102B4-2 of the third conversion unit 102B4, and after being overlapped with the optical axis, the outgoing light beam passes through the third conversion lens 102B5, the virtual surface L, and the fourth conversion lens 102C1 in order, reaches the grating 102C2, is diffracted, and after passing through the fifth conversion lens 102C3, is vertically incident on the corresponding region on the first spatial light modulator 103.
After being switched by the first spatial light modulator 103, the different sub-optical signals are propagated to the grating 102C2 through the fifth conversion lens 102C3 to be synthesized into optical signals containing a plurality of sub-optical signal wavelengths, and finally sequentially pass through the fourth conversion lens 102C1, the virtual surface L, the third conversion lens 102B5 and the fourth part 102B4-2 in the third conversion unit 102B4 along the optical axis, wherein the included angle of the emergent relative optical axis is as followsAfter passing through the second conversion lens 102B3, the optical signal parallel to the optical axis and offset from the optical axis by a distance h is emitted, and then transmitted to the first column control area 105.1 of the second spatial light modulator 105 through the second conversion unit 102B2, and then reflected by the first column control area 105.1 of the second spatial light modulator 105, and then coupled to the first column 104.1 of the second optical fiber array 104A in the second optical transmission array 104.
The embodiment of the application also provides an optical network device, which comprises the wavelength selective switch device in any embodiment.
In some embodiments, the optical network device includes, but is not limited to, a reconfigurable optical add drop multiplexer ROADM or an optical cross-connect OXC built based on the wavelength selective switching device described above.
The present application has been disclosed in terms of exemplary embodiments, and although specific terms are employed, they are used and should be interpreted in a generic and descriptive sense only and not for purpose of limitation. In some instances, it will be apparent to one skilled in the art that features, characteristics, and/or elements described in connection with a particular embodiment may be used alone or in combination with other embodiments unless explicitly stated otherwise. It will therefore be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the scope of the present application as set forth in the following claims.
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