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WO2024113855A1 - Commutateur sélectif en longueur d'onde, carte côté client et nœud - Google Patents

Commutateur sélectif en longueur d'onde, carte côté client et nœud Download PDF

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Publication number
WO2024113855A1
WO2024113855A1 PCT/CN2023/104668 CN2023104668W WO2024113855A1 WO 2024113855 A1 WO2024113855 A1 WO 2024113855A1 CN 2023104668 W CN2023104668 W CN 2023104668W WO 2024113855 A1 WO2024113855 A1 WO 2024113855A1
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WO
WIPO (PCT)
Prior art keywords
optical
optical signals
output
columns
ports
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2023/104668
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English (en)
Chinese (zh)
Inventor
段玉华
宗良佳
吴云飞
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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Publication of WO2024113855A1 publication Critical patent/WO2024113855A1/fr
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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • G02B6/354—Switching arrangements, i.e. number of input/output ports and interconnection types
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/26—Optical coupling means
    • G02B6/35—Optical coupling means having switching means
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/506—Multiwavelength transmitters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q11/00—Selecting arrangements for multiplex systems
    • H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
    • H04Q11/0005—Switch and router aspects

Definitions

  • the present application relates to the field of optical communication technology, and in particular to a wavelength selection switch, a client-side board and a node.
  • ROADM reconfigurable optical add drop multiplexers
  • CDCG wavelength-independent, direction-independent, wavelength-free and flexible grid
  • WSS wavelength selective switch
  • an M ⁇ N WSS includes M input ports, a dispersion component, a first optical switching engine, a second optical switching engine and N output ports, wherein the M input ports are a column of input ports, and the M input ports input a column of optical signals, which pass through the dispersion component and are incident on the first optical switching engine, and the first optical switching engine reflects the incident optical signal and outputs it to the second optical switching engine through the dispersion component, and the second optical switching engine outputs the received optical signal to the corresponding output port among the N output ports.
  • the first optical switching engine When the optical signal is incident on the first optical switching engine, the first optical switching engine needs to arrange M rows of light spots in the port direction, corresponding to the M ports respectively. As the number of ports M of the M ⁇ N WSS increases, the number of rows of light spots that need to be arranged on the first optical switching engine increases.
  • the present application provides a wavelength selective switch, a client-side single board and a node, which can minimize the increase in the number of light spot rows that need to be arranged by the optical switching engine when the number of input ports of the WSS increases.
  • the present application provides a wavelength selective switch, which includes a column of first input ports, a port switching component, an optical switching engine and a dispersion component, N is an integer greater than 1, the column of first input ports are arranged in a column in a first direction, and are used to output a column of optical signals, the port switching component includes P columns of first output ports, the port switching component is used to receive P groups of optical signals, adjust the first output ports corresponding to each optical signal in each group of optical signals, so as to output P columns of optical signals, wherein each group of optical signals corresponds to a different column of first output ports, and the output optical signals of the column of first input ports and at least two columns of ports in the P columns of first output ports are mapped to the optical switching engine.
  • the dispersion component is used to perform dispersion processing on the received P+1 columns of optical signals, so that optical signals of different wavelengths of each optical signal in each column of optical signals are incident on different positions along the second direction of the optical switching engine, the first direction is perpendicular to the second direction, and the optical switching engine is used to reflect and output the incident optical signal.
  • the at least two columns of ports include the first column of ports and the second column of ports, and the output optical signal of the first port in the first column of ports and the output optical signal of the last port in the second column of ports are mapped to the light spots of the optical switching engine, there is at least overlap in the first direction
  • the at least two columns of ports share all or part of the switching area in the first direction. Therefore, even if the input port is increased in the wavelength selective switch, the number of rows of the light spots of the optical switching engine in the first direction can be increased less or not increased.
  • the output optical signals of the two adjacent columns of ports in the first column of input ports and the P columns of first output ports along the second direction are mapped to light spots of the optical switching engine that overlap in the second direction, so that all or part of the switching area can be shared in the second direction, thereby preventing a significant increase in the size of the optical switching engine in the second direction.
  • the light spots of the P+1 columns of optical signals mapped to the optical switching engine do not overlap, so that the light spots incident on the optical switching engine
  • the optical signals of the engines are exchanged independently.
  • At least two columns of optical signals in the P+1 columns of optical signals belong to different wavelength bands, and optical signals of multiple wavelength bands can be exchanged through a single wavelength selective switch.
  • the value of P is 1, and the P+1 columns of optical signals belong to the conventional (C) band and the long (L) band respectively.
  • the wavelength selective switch further includes P columns of first output ports and P+1 reflection units, the P+1 reflection units correspond one-to-one with the P+1 column of second output ports, the P+1 column of second output ports correspond one-to-one with the P+1 column of optical signals, in the P+1 column of optical signals outputted from the first input port and the P column of first output ports, the optical signals in each column of optical signals are parallel and located in the same plane, and at least two columns of optical signals are not parallel, the P+1 reflection units are used to receive the optical signal reflected by the optical switching engine, and output the optical signal reflected by the optical switching engine to the corresponding output port in the P+1 column of second output ports.
  • the P+1 column of second output ports of the wavelength selective switch correspond one-to-one with the P+1 column of optical signals, so that the functions of multiple up/down wavelength selection can be realized through a single wavelength selective switch.
  • the output optical signals of at least two columns of the ports in the one column of first input ports and the P columns of first output ports are mapped to the light spots of the optical switching engine and completely overlap in the second direction, so that the size of the optical switching engine in the second direction will not be significantly increased.
  • the port switching component is used to switch the first optical signal to the first output port corresponding to the third optical signal when the light spots of the first optical signal and the second optical signal mapped to the optical switching engine overlap, the first optical signal and the second optical signal belong to different groups of optical signals, the first optical signal and the third optical signal belong to the same group of optical signals, and the light spot of the optical signal output from the first output port corresponding to the third optical signal mapped to the optical switching engine does not overlap with other light spots on the optical switching engine.
  • the port switching component switches the first optical signal to the first output port corresponding to other optical signals, so that when it is incident on the switching engine, it will not overlap with the light spots of other optical signals, so that the optical switching engine can switch the first optical signal.
  • the port switching component further includes K second input ports and P port switching modules, the K second input ports are divided into P groups of second input ports, the P groups of second input ports correspond one-to-one to the P port switching modules, K is an integer greater than 1, the P groups of second input ports are used to receive the P groups of optical signals, input the P groups of optical signals to the P port switching modules, the P groups of second input ports correspond one-to-one to the P groups of optical signals, and the P port switching modules are used to adjust the first output ports corresponding to each optical signal in each group of optical signals to output the P columns of optical signals.
  • each port switching module independently determines the first output port for each optical signal in a group of optical signals, so that the P groups of optical signals do not interfere with each other.
  • the port switching module includes a first reflector array, a lens, and a second reflector array, wherein the first reflector array is used to rotate and adjust the reflectors in the second reflector array corresponding to each received optical signal to output the reflected optical signal to the lens, the lens is used to output the received optical signal to the second reflector array, and the second reflector array is used to reflect and output each optical signal output by the lens to the corresponding first output port by rotating.
  • the port switching module is implemented based on two reflector arrays and one lens, which is easy to implement and has low insertion loss.
  • the port switching module includes a controller and an optical waveguide, and for the port switching module corresponding to the first group of optical signals in the P group of optical signals, the controller is used to control the optical waveguide to adjust the first output port corresponding to each received optical signal.
  • the port switching module is implemented by an optical waveguide, and the implementation difficulty is low.
  • the number of ports in every two columns of the one column of first input ports and the P columns of first output ports is the same, or the number of ports in at least two columns of the one column of first input ports and the P columns of first output ports is different.
  • the present application provides a client-side single board, which includes two wavelength selection switches in the first aspect or the optional manner of the first aspect.
  • the two wavelength selective switches include a first wavelength selective switch and a second wavelength selective switch
  • the client-side single board also includes a wavelength splitting module and a wavelength combining module
  • the wavelength splitting module is used to perform wavelength splitting processing on the optical signals of the P+1 wavelength bands received from the line-side device, and input the optical signals of each wavelength band of the optical signals of the P+1 wavelength bands to the first wavelength selective switch as P+1 columns of optical signals
  • the wavelength combining module is used to receive the optical signals of the P+1 wavelength bands sent by the second wavelength selective switch, perform wavelength combining processing on the received optical signals of the P+1 wavelength bands, and output the wavelength combined processed optical signals to the line-side device.
  • the two wavelength selective switches can be used to implement the adding and dropping of optical signals of multiple wavelength bands.
  • the present application provides a node, comprising the wavelength selective switch in the first aspect or the optional manner of the first aspect and at least one 1 ⁇ L wavelength selective switch, where L is an integer greater than 1.
  • the present application provides a node, comprising the client-side board in the second aspect or the optional manner of the second aspect and at least one 1 ⁇ L wavelength selection switch, where L is an integer greater than 1.
  • FIG1 is a schematic diagram of the light spot arrangement in a traditional WSS
  • FIG2 is a schematic diagram of the light spot arrangement in a conventional WSS
  • FIG3 is a schematic diagram of the structure of a WSS provided by an exemplary embodiment of the present application.
  • FIG4 is a schematic diagram of a light spot arrangement provided by an exemplary embodiment of the present application.
  • FIG5 is a schematic diagram of a light spot arrangement provided by an exemplary embodiment of the present application.
  • FIG6 is a schematic diagram of a light spot arrangement provided by an exemplary embodiment of the present application.
  • FIG. 7 is a schematic diagram of an optical path from a column of first input ports to an optical switching engine in a first direction provided by an exemplary embodiment of the present application;
  • FIG8 is a schematic diagram of an optical path from a port switching component to an optical switching engine in a first direction provided by an exemplary embodiment of the present application;
  • FIG. 9 is a schematic diagram of an optical path from the input of the WSS to the optical switching engine in the second direction provided by an exemplary embodiment of the present application;
  • FIG. 10 is a schematic diagram of an optical path from an optical switching engine to an output port in a first direction provided by an exemplary embodiment of the present application;
  • FIG. 11 is a schematic diagram of an optical path from an optical switching engine to an output port in a second direction provided by an exemplary embodiment of the present application;
  • FIG12 is a schematic diagram of a light spot arrangement provided by an exemplary embodiment of the present application.
  • FIG. 13 is a schematic diagram of an optical path from the input of the WSS to the optical switching engine in the second direction provided by an exemplary embodiment of the present application;
  • FIG. 14 is a schematic diagram of an optical path from an optical switching engine to an output port in a second direction provided by an exemplary embodiment of the present application;
  • 15 is a schematic diagram of an optical path from the input of the WSS to the optical switching engine in the second direction provided by an exemplary embodiment of the present application;
  • FIG16 is a schematic diagram of an optical path from an optical switching engine to an output port in a first direction provided by an exemplary embodiment of the present application;
  • 17 is a schematic diagram of an optical path from an optical switching engine to an output port in a second direction provided by an exemplary embodiment of the present application;
  • FIG18 is a schematic diagram of the structure of a WSS provided by an exemplary embodiment of the present application.
  • FIG19 is a schematic diagram of the structure of a port switching module in a first direction provided by an exemplary embodiment of the present application.
  • FIG20 is a schematic diagram of the structure of a port switching module in the second direction provided by an exemplary embodiment of the present application.
  • FIG21 is a schematic diagram of the structure of a port switching module provided by an exemplary embodiment of the present application.
  • FIG22 is a schematic diagram of a port arrangement provided by an exemplary embodiment of the present application.
  • FIG23 is a schematic diagram of a port arrangement provided by an exemplary embodiment of the present application.
  • FIG24 is a schematic diagram of the structure of a client-side single board provided by an exemplary embodiment of the present application.
  • FIG25 is a schematic diagram of the structure of a client-side single board provided by an exemplary embodiment of the present application.
  • FIG26 is a schematic diagram of the structure of a node provided by an exemplary embodiment of the present application.
  • FIG. 27 is a schematic diagram of the structure of a node provided by an exemplary embodiment of the present application.
  • Illustration 1 First input port; 2. Port switching component; 3. Optical switching engine; 4. Dispersion component; 5. Reflection unit; 6. Second output port; 05. Reflection module; 21. First output port; 22. Second input port; 23. Port switching module; 231, first reflector array; 232, lens; 233, second reflector array; 234, controller; 235, optical waveguide; 41. First lens; 42. Second lens; 43. Third lens; 44. Diffraction grating; 45. Fourth lens.
  • the communication network adopts an all-optical network.
  • the M ⁇ N WSS is a key component.
  • the M ports in the M ⁇ N WSS are connected to the line-side equipment, and the N ports are connected to the customer equipment.
  • an M ⁇ N WSS includes M input ports, a dispersion component, a first optical switching engine, a second optical switching engine, and N output ports.
  • the M input ports are a column of input ports.
  • the M input ports input a column of optical signals.
  • the column of optical signals passes through the dispersion component.
  • the optical signal input from each input port is dispersed into optical signals of multiple wavelengths ( ⁇ 1 to ⁇ 120) in the dispersion direction and incident on the first optical switching engine.
  • the first optical switching engine reflects the incident optical signal and outputs it to the second optical switching engine through the dispersion component.
  • the second optical switching engine outputs the received optical signal to the corresponding output port among the N output ports.
  • the first optical switching engine When the optical signal is incident on the first optical switching engine, the first optical switching engine The engine needs to arrange M rows of light spots (L1 to LM) in the port direction, corresponding to M input ports respectively. See the arrangement of light spots on the first optical switching engine in Figure 1. As the number of ports M of the M ⁇ N WSS increases, the number of light spot rows that need to be arranged on the first optical switching engine increases. In order to keep the size of the first optical switching engine unchanged, one way is to reduce the light spot size of the first optical switching engine in the port direction. However, the reduction in the light spot size will cause the diffraction angle to be too large when the first optical switching engine reflects the optical signal, the diffraction efficiency is relatively low, and the insertion loss and crosstalk performance are degraded. Another way is to increase the size of the first optical switching engine. However, due to the current chip technology, the larger-sized first optical switching engine faces practical problems such as difficulty in manufacturing, and it is difficult to support the continuous increase in the number of input ports.
  • the increase in the number of input ports will lead to an increase in the height of the first optical switching engine, which will further lead to an increase in the height of the WSS, and the integration requirement cannot be met.
  • Another way is to keep the size of the first optical switching engine unchanged and reduce the area occupied by each wavelength channel in the first optical switching engine. In this case, if the spot size in the dispersion direction is kept unchanged, the filtering bandwidth performance will be degraded.
  • an embodiment of the present application provides a WSS, in which there is a column of first input ports 1 and P columns of first output ports 21 included in a port switching component 2.
  • a WSS in which there is a column of first input ports 1 and P columns of first output ports 21 included in a port switching component 2.
  • the first direction may be referred to as a port direction or a switching direction
  • the second direction may be referred to as a dispersion direction or a wavelength direction.
  • the dispersion component includes a diffraction grating
  • the first direction is a direction parallel to the diffraction grating lines
  • the second direction is a direction perpendicular to the diffraction grating lines.
  • the first direction is perpendicular to the second direction, and both are perpendicular to the light transmission direction.
  • FIG3 provides a schematic diagram of the structure of the WSS.
  • the WSS includes a column of first input ports 1, a port switching component 2, an optical switching engine 3, a dispersion component 4, a reflection module 05, and N second output ports 6.
  • the column of first input ports 1 is arranged in a row in the first direction for inputting optical signals.
  • the optical signal input by each first input port 1 can be a wavelength division multiplexing (WDM) optical signal or a single wavelength optical signal.
  • WDM wavelength division multiplexing
  • the optical signal input by each first input port 1 is called an optical signal.
  • the port switching component 2 includes P columns of first output ports 21.
  • the light spots of the output optical signals of the ports mapped to the optical switching engine 3 refer to the light spots formed by the output optical signals being transmitted to the optical switching engine 3 through the dispersion component 4.
  • the optical transmission path in the WSS is: the first input port 1 in the column outputs a column of optical signals, and each optical signal in the column of optical signals is parallel and located in the same plane.
  • the port switching component 2 receives P groups of optical signals, where P is an integer greater than or equal to 1. Any optical signal in each group of optical signals can be a WDM signal or a single-wavelength optical signal.
  • the port switching component 2 determines the first output port 21 corresponding to each optical signal in the P group of optical signals, and outputs each optical signal from the determined first output port 21.
  • the P column of first output ports 21 corresponds to the P group of optical signals one by one.
  • the P column of optical signals is output through the P column of first output ports 21.
  • the value of P is 1, the number of first output ports 21 in the column of first output ports 21 is 10, and a group of optical signals includes 10 optical signals, which are output from the 10 first output ports 21 respectively.
  • the optical signals in each column of optical signals are parallel and located in the same plane. In this way, it is equivalent to transmitting P+1 columns of optical signals in WSS.
  • the P+1 columns of optical signals are incident on the dispersion component 4.
  • the dispersion component 4 performs dispersion processing on the P+1 columns of optical signals, so that the optical signals of different wavelengths in each optical signal in the P+1 columns of optical signals are incident on the optical switching engine 3 at different positions along the second direction.
  • the optical signal transmitted from one port is called one optical signal.
  • the optical switching engine 3 performs optical field modulation on the incident optical signal, so that the optical signal is reflected and output along the required angle.
  • the optical signal reflected by the optical switching engine 3 is output to the reflection module 05 through the dispersion component 4.
  • the reflection module 05 performs angle deflection on the incident optical signal, so that the incident optical signal is coupled to the corresponding output port among the N second output ports 6.
  • FIG3 shows a schematic diagram of the transmission of the first optical signal in the P optical signal group.
  • the first optical signal group includes S optical signals, which are respectively input.
  • the solid line with an arrow indicates the optical signal transmission path input to the optical switching engine 3, and the dotted line with an arrow indicates the optical signal transmission path from the optical switching engine 3 to the N second output ports 6. Only one optical signal transmission path from the optical switching engine 3 to the N second output ports 6 is shown in FIG3 .
  • FIG. 3 a column of first input ports 1 and P columns of first output ports 21 are not in the same plane.
  • FIG. 3 only shows a column of first output ports 21 , and does not show a column of first input ports 1 .
  • the output optical signals of every two columns of ports in a column of first input ports 1 and P columns of first output ports 21 are mapped to the light spots of the optical switching engine 3 and overlap in the first direction. In this way, the output optical signals of multiple columns of ports are multiplexed in the switching area, thereby making the size of the optical switching engine 3 in the first direction relatively small.
  • a column of first input ports 1 and P columns of first output ports 21 may be located in the same plane formed by the first direction and the second direction, or may be located in two planes formed by the first direction and the second direction, that is, a column of first input ports 1 is located in one plane, and P columns of first output ports 21 are located in another plane.
  • the plane formed by the first direction and the second direction is perpendicular to the light transmission direction.
  • the optical signals in each column of optical signals in the P+1 columns of optical signals are parallel and located in the same plane, and the distance in the second direction between each two columns of ports adjacent to each other in the first input port 1 in the column and the first output port 21 in the P column along the second direction is less than the target value, the target value is relatively small, and the specific value of the target value can be set according to actual needs.
  • the setting of the target value makes the output optical signals of each two columns of ports adjacent to each other in the second direction in the first input port 1 in the column and the first output port 21 in the P column overlap when mapped to the light spots of the optical switching engine 3. In this way, since each two columns of ports adjacent to each other in the second direction can also reuse the switching area as much as possible, the size of the optical switching engine 3 in the second direction will not increase significantly.
  • the light spots of the P+1 column optical signals mapped to the optical switching engine 3 are not overlapped through the port switching component 2. In this way, any two light spots do not overlap, and only one single-wavelength optical signal is incident at a light spot position.
  • the optical switching engine 3 only performs light field modulation on the single-wavelength optical signal, so that the single-wavelength optical signal is reflected and output along a desired angle, so that the optical signals do not affect each other.
  • FIG4 shows a schematic diagram of the arrangement of light spots on the optical switching engine 3.
  • P takes a value of 1, assuming that both columns of optical signals include S optical signals, and assuming that the wavelength range of each optical signal in the two columns of optical signals is ⁇ 1 to ⁇ 120.
  • the solid line shows the light spot corresponding to a column of optical signals output from a first input port 1
  • the dotted line shows the light spot corresponding to a column of optical signals output from the port switching component 2.
  • the two columns of optical signals share the switching area of the optical switching engine 3 in the first direction, and the light spots corresponding to the two columns of optical signals overlap each other in the second direction, which will make the two columns of optical signals unable to be reflected independently by the optical switching engine 3.
  • the optical signals output from the N second output ports 6 are all single-wavelength optical signals, then the total number of wavelengths of the optical signals input to WSS is less than or equal to N.
  • the port switching component 2 adjusts the first output port 21 of the optical signal so that the light spots mapped to the optical switching engine 3 do not overlap.
  • the processing method is as follows:
  • the port switching component 2 is used to adjust the first optical signal to the first output port 21 corresponding to the third optical signal, that is, the light spot of the first optical signal is exchanged to the idle area of the optical switching engine 3, so that the light spot formed by the first optical signal incident on the optical switching engine 3 does not overlap with other light spots on the optical switching engine 3.
  • the first optical signal is exchanged to the first output port 21 corresponding to the third optical signal, the third optical signal and the first optical signal belong to the same group of optical signals, the third optical signal is not input to the WSS, or the third optical signal is input to the WSS, but is arranged to the first output port 21 of other optical signals, and the third optical signal and the other optical signals belong to the same group of optical signals.
  • the port switching component 2 adjusts the optical signal corresponding to the position L1 in one column of optical signals to the first output port 21 corresponding to the position L2, and inputs it into the optical path of the WSS.
  • the port switching component 2 adjusts the optical signal corresponding to the position L3 in one column of optical signals to the first output port 21 corresponding to the position LS, and inputs it into the optical path of the WSS. Then, the schematic diagram of the light spot arrangement changes from FIG5 to FIG6. In this way, by adjusting the first output port 21 of the optical signal through the port switching component 2, the overlap of the actual light spots can be avoided, so that the optical signal can be output from the output port of the WSS.
  • the N second output ports 6 are arranged in a row in the first direction.
  • the optical signal transmission is explained by taking the value of P as 1 as an example.
  • a column of the first input port 1 outputs a column of optical signals
  • the P column of the first output port 21 outputs a column of optical signals, which is equivalent to transmitting two columns of optical signals in WSS.
  • FIG7 shows an optical path diagram from a column of first input ports 1 to the optical switching engine 3 in the first direction.
  • the column of first input ports 1 includes S ports, represented as I 1a to I Sa , and in the first direction, the optical signal input from the column of first input ports 1 passes through the dispersion component 4 and is incident on the positions L 1 to L S of the optical switching engine 3.
  • FIG8 shows an optical path diagram from the port switching component 2 to the optical switching engine 3 in the first direction.
  • the value of P is 1.
  • the group of optical signals is input to the port switching component 2, the port switching component 2 determines the first output port 21 corresponding to the group of optical signals, and outputs a column of optical signals corresponding to the group of optical signals from a column of first output ports 21.
  • the column of optical signals passes through the dispersion component 4 and is incident to the L1 to L S positions of the optical switching engine 3.
  • FIG8 shows that the output optical signals of a column of first output ports 21 are incident to the L1 to L S positions of the optical switching engine 3.
  • FIG9 shows an optical path diagram of the input of WSS to the optical switching engine 3 in the second direction.
  • P takes a value of 1.
  • two columns of optical signals are incident on the optical switching engine 3 through the dispersion component 4, and optical signals of different wavelengths in each optical signal are incident on different positions of the optical switching engine 3. Since the distance between each two adjacent columns of ports in a column of first input ports 1 and P columns of first output ports 21 along the second direction is less than the target value, the light spots mapped between the output optical signals of each two adjacent columns of ports on the optical switching engine 3 in the second direction will also be staggered by a certain distance.
  • FIG9 shows optical signals of wavelengths ⁇ 1 to ⁇ 3.
  • the optical path of a group of optical signals passing through the port switching component 2 is represented by a dotted line, and the optical path of a column of optical signals input by a column of first input ports 1 is represented by a solid line.
  • the target value should be set according to actual needs, so that in the second direction, the distance between the light spots mapped between the output optical signals of each two adjacent columns of ports on the optical switching engine 3 is relatively small, so as to reduce the size of the optical switching engine 3.
  • Figure 10 shows the optical path diagram from the optical switching engine 3 to the output port of the WSS in the first direction.
  • the optical switching engine 3 controls the reflection angle of the incident optical signal, and the optical signal reflected from the optical switching engine 3 passes through the dispersion component 4, so that the optical signal is output to the corresponding position of the reflection module 05.
  • the reflection module 05 includes N micro-electromechanical system (MEMS) mirrors, and the N MEMS mirrors correspond to the N second output ports 6 one by one. Each MEMS mirror can independently control the reflection angle, so as to couple the optical signal incident on the MEMS mirror to the corresponding second output port 6 among the N second output ports 6.
  • MEMS micro-electromechanical system
  • FIG10 the dotted lines and the solid lines respectively represent the transmission optical path diagrams of optical signals of different wavelengths.
  • the reflective module 05 may also be liquid crystal on silicon (LCOS), a digital micromirror device (DMD) or a digital light processor (DLP), etc.
  • LCOS liquid crystal on silicon
  • DMD digital micromirror device
  • DLP digital light processor
  • FIG11 shows an optical path diagram from the optical switching engine 3 to the output port of the WSS in the second direction.
  • the two columns of optical signals will be reflected onto the MEMS reflector at different angles.
  • one of the columns of optical signals is selected to be coupled to the corresponding output port.
  • any MEMS reflector in the reflection module 05 will only receive one optical signal at the same time, and will not receive two optical signals at the same time.
  • the any MEMS reflector outputs the incident optical signal to the second output port 6 for output.
  • any MEMS reflector in the reflection module 05 may also receive two or more optical signals at the same time, but will only select one of the optical signals to be output from the second output port 6.
  • the two or more optical signals belong to the same column of optical signals, or belong to different columns of optical signals.
  • each optical signal involved is a single-wavelength optical signal.
  • FIG9 and FIG11 are for better illustrating the transmission light path, illustrating the transmission light path of two columns of optical signals. i takes values from 1 to S, and j takes values from 1 to 3.
  • the dispersion component 4 includes a first lens 41, a second lens 42, a third lens 43, a diffraction grating 44 and a fourth lens 45.
  • the first lens 41 and the second lens 42 form a 4f optical path system
  • the third lens 43 and the fourth lens 45 form a 4f optical path system
  • the diffraction grating 44 can be a transmission type diffraction grating or a reflection type diffraction grating.
  • the dispersion component 4 may not include the first lens 41 and the second lens 42.
  • the two optical signals are mapped to the front focal plane of the third lens 43 via the 4f optical path formed by the first lens 41 and the second lens 42.
  • the third lens 43 changes the incident direction so that the two optical signals are incident on the diffraction grating 44.
  • the dispersion effect of the diffraction grating 44 causes the optical signals of different wavelengths in each WDM optical signal in the two optical signals to be emitted along different angles.
  • the fourth lens 45 transforms the single-wavelength optical signal from an angle to a position, so that optical signals of different wavelengths are incident on different positions of the optical switching engine 3.
  • the optical signal transmitted from the optical switching engine 3 to the N second output ports 6 does not pass through the first lens 41 in the dispersion component 4.
  • the optical switching engine 3 controls the reflection angle of the incident optical signal, and the optical signal reflected from the optical switching engine 3 passes through the fourth lens 45, the diffraction grating 44 and the third lens 43, and then the second lens 42 realizes the transformation from angle to position, so that the optical signal is output to the corresponding MEMS reflector.
  • the WSS is a multi-band WSS, and at least two columns of optical signals in the P+1 columns of optical signals belong to different bands. In this way, optical signals of multiple bands can be exchanged through one WSS.
  • optical signals of different columns in the P+1 column optical signal belong to different bands.
  • P is 1, and there are two columns of optical signals in the WSS, and the two columns of optical signals belong to the C band and the L band respectively.
  • the following is an example in which two columns of optical signals belong to the C band and the L band respectively.
  • the first column of optical signals belongs to the C band, and the second column of optical signals belongs to the L band.
  • the first column of optical signals is directly input into the dispersion component 4 through a column of first input ports 1, and the second column of optical signals is input into the dispersion component 4 through a column of first output ports 21 of the port switching component 2.
  • the distance between a column of first input ports 1 and a column of first output ports 21 in the second direction is selected according to actual needs, so that the light spots of the output optical signals of a column of first input ports 1 and a column of first output ports 21 mapped to the optical switching engine 3 overlap as much as possible in the second direction, so as to reduce the size of the optical switching engine 3 in the second direction.
  • the following description is based on the example that the light spots of the output optical signals of a column of first input ports 1 and a column of first output ports 21 mapped to the optical switching engine 3 completely overlap in the first direction, assuming that the two columns of optical signals input by the two columns of ports both include S-path optical signals.
  • FIG7 shows an optical path diagram from the first input port 1 to the optical switching engine 3 in the first direction.
  • the first input port 1 in the column includes S ports, represented as I 1a to I Sa , and in the first direction, the C-band optical signal input by the first input port 1 in the column passes through the dispersion component 4 and is incident on the positions L 1 to L S of the optical switching engine 3.
  • FIG8 shows an optical path diagram from the port switching component 2 to the optical switching engine 3.
  • the value of P is 1.
  • the L-band optical signal is input to the port switching component 2.
  • the port switching component 2 determines the first output port 21 corresponding to the L-band optical signal, and outputs a column of L-band optical signals through the first output port 21.
  • the column of optical signals passes through the dispersion component 4 and is incident on the L1 to LS positions of the optical switching engine 3.
  • the port switching component 2 When determining the first output port 21 corresponding to the L-band optical signal, the port switching component 2 adjusts the optical signal that originally overlaps with the light spot of the C-band optical signal to other positions where no light spots exist, so that the light spots of the C-band optical signal and the L-band optical signal on the optical switching engine 3 do not overlap. See the light spot arrangement schematic diagram shown in FIG12 .
  • the black ellipse indicates the position where the light spot actually exists.
  • ⁇ iC and ⁇ iL belong to the C-band and the L-band respectively, and i takes a value of 1 to 120.
  • FIG13 shows an optical path diagram of the input of the WSS to the optical switching engine 3 in the second direction.
  • the value of P is 1.
  • two columns of optical signals are incident on the optical switching engine 3 via the dispersion component 4, and optical signals of different wavelengths are incident on different positions of the optical switching engine 3. Since a column of first input ports 1 and a column of first output ports 21 are staggered by a certain distance in the second direction, the light spots mapped by the two columns of optical signals on the optical switching engine 3 are also staggered by a certain distance.
  • FIG13 shows optical signals of wavelengths ⁇ 1C to ⁇ 3C in the C band and optical signals of wavelengths ⁇ 1L to ⁇ 3L in the L band.
  • the light spots mapped by the optical signals of wavelengths ⁇ 1C to ⁇ 3C to the optical switching engine 3 are staggered by a certain distance from the light spots mapped by the optical signals of wavelengths ⁇ 1L to ⁇ 3L to the optical switching engine 3.
  • the optical signal of the L band passes through the port switching component 2, and the optical path is represented by a dotted line, and the optical path of the optical signal of the C band is represented by a solid line.
  • Fig. 10 shows a light path diagram from the optical switching engine 3 to the output port of the WSS in the first direction.
  • the optical switching engine 3 controls the reflection angle of the incident optical signal.
  • the second lens 42 realizes the transformation from angle to position, so that the optical signal is output to the corresponding MEMS reflector.
  • Fig. 14 shows the optical path diagram from the optical switching engine 3 to the output port of the WSS in the second direction.
  • the optical signal of the C band and the optical signal of the L band will be reflected to the MEMS reflector at different angles.
  • the optical signal of the C band or the optical signal of the L band can be selectively coupled to the corresponding second output port 6.
  • any MEMS reflector in the reflection module 05 will only receive the C-band optical signal or the L-band optical signal at the same time, but will not receive the C-band optical signal and the L-band optical signal at the same time, and the any MEMS reflector will output the incident optical signal from the second output port 6.
  • any MEMS reflector in the reflection module 05 can also receive the C-band and L-band optical signals at the same time, but will only select one of the bands of optical signals.
  • the optical signal is output from the second output port 6. In this example, it is possible that part of the optical signal incident on the WSS will not be output from the second output port 6.
  • each optical signal is an optical signal of a single wavelength.
  • the above description is based on a two-band WSS as an example, and the WSS may also be a three-band or more WSS, and the value of P is greater than or equal to 2.
  • the above description is about inputting an L-band optical signal into the port switching component 2, and in another embodiment, the C-band optical signal may also be input into the port switching component 2.
  • optical signals of different bands are input into the optical path of WSS as optical signals of different columns, and optical signals of different columns are separated by a suitable distance in the second direction, so that the light spots of optical signals of different bands mapped to the optical switching engine 3 overlap as much as possible in the second direction, thereby realizing the multiplexing of optical signals of different bands in the switching area of the optical switching engine 3.
  • the WSS integrates multiple add/drop wavelength selection functions, which is equivalent to integrating multiple WSS functions in a single module.
  • multiple add/drop wavelength selection functions are integrated in one WSS.
  • a column of first input ports 1 outputs a column of optical signals
  • the port switching component 2 outputs P columns of optical signals, so that there are P+1 columns of optical signals in the WSS, and at least two columns of optical signals in the P+1 column of optical signals are not parallel.
  • the optical signals in each column of optical signals in the P+1 column of optical signals are parallel and located in the same plane, and every two columns of optical signals are not parallel, that is, there is a certain angle between every two columns of optical signals, and the angle can be set according to actual needs.
  • the N second output ports 6 are divided into P+1 columns, which are called P+1 column second output ports 6, and the P+1 column second output ports 6 correspond to the P+1 column optical signals one by one, that is, the P+1 column second output ports 6 are used to output the P+1 column of optical signals, and the output ports of different columns are used to output optical signals of different columns in the P+1 column of optical signals.
  • the N second output ports 6 are divided into P+1 columns in the second direction, and a column of first input ports 1 and P columns of first output ports 21 are also located in the second direction, so that the volume of the WSS is relatively small. The following description is made by taking the case where two columns of optical signals are not parallel.
  • the reflection module 05 includes P+1 reflection units 5, and the P+1 reflection units 5 correspond to the P+1 columns of second output ports 6 one by one, that is, each column of second output ports 6 corresponds to a reflection unit 5, and different columns of second output ports 6 correspond to different reflection units 5, and the reflection unit 5 can be a MEMS mirror array. In this way, each column of optical signals can be independently exchanged to the corresponding second output port 6 by the corresponding reflection unit 5.
  • a column of optical signals is input into a first input port 1, and the column of optical signals directly enters the optical path of the WSS for transmission, and a group of optical signals is input into the port switching component 2.
  • the port switching component 2 arranges the group of optical signals in sequence and also outputs a column of optical signals through a first output port 21.
  • Two columns of optical signals are transmitted in the WSS, and there is a certain angle between the two columns of optical signals. The size of the angle can be set according to actual needs.
  • the two columns of optical signals After being dispersed by the dispersion component 4, the two columns of optical signals are incident on the optical switching engine 3. Since the port switching component 2 controls the first output port 21 corresponding to each optical signal in the group of optical signals, the light spots of the two columns of optical signals will not overlap as much as possible after being incident on the optical switching engine 3.
  • FIG15 shows a schematic diagram of the optical path of the WSS input to the optical switching engine 3 in the second direction.
  • two columns of optical signals are mapped to the front focal plane of the third lens 43 via the 4f optical path composed of the first lens 41 and the second lens 42.
  • the third lens 43 changes the incident direction so that the two columns of optical signals are incident on the diffraction grating 44.
  • the dispersion effect of the diffraction grating 44 causes the optical signals of different wavelengths in each WDM optical signal in the two columns of optical signals to be emitted at different angles.
  • the fourth lens 45 transforms the single-wavelength optical signal from angle to position, so that the optical signals of different wavelengths in each optical signal are incident on different positions of the optical switching engine 3. See FIG7 and FIG8 for a schematic diagram of the optical path of the optical signal transmitted to the optical switching engine 3 in the first direction, which will not be repeated here.
  • the optical switching engine 3 reflects the incident optical signal, and the reflected optical signal is output to the reflection unit 5 through the fourth lens 45, the diffraction grating 44, the third lens 43 and the second lens 42, wherein the two columns of optical signals are reflected by the optical switching engine 3 and then output to the reflection units 5 corresponding to the two columns of optical signals.
  • the reflection unit 5 deflects the incident optical signal at an angle in the first direction and couples the optical signal to the second output port 6 corresponding to the reflection unit 5.
  • FIG16 shows an optical path diagram from the optical switching engine 3 to the N second output ports 6 in the first direction.
  • FIG17 shows an optical path diagram from the optical switching engine 3 to the N second output ports 6 in the second direction.
  • the light spots of the output optical signals of a column of first input ports 1 and a column of first output ports 21 mapped to the optical switching engine 3 completely overlap in the second direction (see wavelengths ⁇ 1a and ⁇ 1b, and ⁇ 2a and ⁇ 2b), but after one of the optical signals passes through the port switching component 2, after the two optical signals are incident on the optical switching engine 3, the light spots of the optical signals ⁇ 1a and ⁇ 1b do not overlap, but on a line perpendicular to the second direction, the light spots of the optical signals ⁇ 2a and ⁇ 2b do not overlap, but on a line perpendicular to the second direction.
  • the size of the optical switching engine 3 in the second direction can also be reduced.
  • the light spots of the optical switching engine 3 mapped to the optical switching engine 3 by a column of first input ports 1 and a column of first output ports 21 may also partially overlap in the second direction.
  • the embodiments of the present application are not limited thereto.
  • the port switching component 2 has a variety of structures, and a feasible structure is provided as follows.
  • the port switching component 2 includes K second input ports 22, P port switching modules 23 and P columns of first output ports 21, K is an integer greater than 1, K second input ports 22 and a column of first input ports 1 constitute M input ports, so that the WSS is an M ⁇ N WSS.
  • the K second input ports 22 are divided into P groups of second input ports 22.
  • the P groups of second input ports 22 correspond to the P port switching modules 23 one by one, the P groups of second input ports 22 are connected to the P port switching modules 23 through optical fibers, and the P port switching modules 23 are located on the optical path between the K second input ports 22 and the P columns of first output ports 21.
  • the P group of second input ports 22 receive the P group of optical signals, and input the P group of optical signals to the connected P port switching modules 23. Each group of second input ports 22 inputs a group of optical signals, and different groups of second input ports 22 input different groups of optical signals. Multiple optical signals in a group of optical signals correspond one-to-one to multiple second input ports 22 in a group of second input ports 22, that is, each second input port 22 inputs one optical signal.
  • the P group of optical signals corresponds one-to-one to the P column first output ports 21.
  • the P port switching modules 23 output each optical signal in the P group of optical signals to the corresponding first output port 21, so as to output the P column optical signals through the P column first output ports 21.
  • FIG. 18 shows the case where the value of P is 1.
  • each port switching module 23 is used to output each optical signal in a group of optical signals to the corresponding first output port 21, and different port switching modules 23 are used to output each optical signal in different groups of optical signals to the corresponding first output port 21.
  • the port switching module 23 can be understood as including a column of input ports and a column of output ports, the column of input ports and the column of output ports are perpendicular to each other, the number of input ports and output ports is the same, both are O, and the port switching module 23 can realize the switching of optical signals input from any input port to any output port for output. Two implementations of the port switching module 23 are provided as follows.
  • the port switching module 23 includes a first reflector array 231, a lens 232, and a second reflector array 233.
  • the first reflector array 231 and the second reflector array can both be MEMS reflector arrays, and the number of MEMS reflectors included in the MEMS reflector array is O.
  • the port switching module 23 of the first group of optical signals is taken as an example for description.
  • the first group of optical signals is output from a group of second input ports 22 and input to the corresponding input port of the port switching module 23, wherein one optical signal in the first group of optical signals is input to one input port of the port switching module 23.
  • the first reflector array 231 adjusts the reflectors in the second reflector array 233 corresponding to each optical signal received by rotation, such as each reflector in the first reflector array 231 is used to reflect one optical signal to a specified position of the lens 232 by rotation, and the lens 232 transforms the first group of optical signals from angle to position and outputs them to the second reflector array 233, and the second reflector array 233 reflects and outputs each optical signal transformed by the lens 232 to the corresponding output port by rotation, and the output port outputs the received optical signal to the connected first output port 21, such as each reflector in the second reflector array 233 outputs the received optical signal to the corresponding output port by rotation.
  • FIG19 is a schematic diagram showing the transmission of an optical signal in a first direction. Referring to FIG19 , in the first direction, the selection of an output port is achieved by the first reflector array 231 and the lens 232.
  • FIG20 is a schematic diagram showing the transmission of an optical signal in a second direction. Referring to FIG20 , in the second direction, the selection of an input port is achieved by the lens 232 and the second reflector array 233.
  • the port switching module 23 can realize the switching of an optical signal input from any input port to any output port for output.
  • the port switching module 23 is implemented by two reflector arrays and one lens, so that the port switching module 23 is easy to implement.
  • the port switching module 23 is implemented by an optical waveguide.
  • the port switching module 23 includes a controller 234 and an optical waveguide 235.
  • the controller controls the optical waveguide 235 to output each optical signal in the first group of optical signals to the corresponding first output port 21, so as to output a column of optical signals corresponding to the first group of optical signals.
  • the port switching module 23 further includes a controller 234.
  • the controller 234 controls the first reflector array 231 and the second reflector array 233 to switch the optical signal input from any input port to any output port for output.
  • the controller 234 controls the optical waveguide 235 to switch the optical signal input from any input port to any output port for output.
  • the WSS further includes a target controller.
  • the target controller controls the first reflector array 231 and the second reflector array 233 to switch the optical signal input from any input port to any output port for output.
  • the target controller controls the optical waveguide 235 to switch the optical signal input from any input port to any output port for output.
  • the target controller can obtain the wavelength information of the optical signal input into the WSS, and use the wavelength information to control the first output port 21 corresponding to each optical signal in the P group of optical signals.
  • the WSS includes M input ports and N output ports.
  • the M input ports include a column of first input ports 1 and P groups of second input ports 22, and the number of the first input ports 1 in a column is the same as the number of each group of second input ports 22, which is equivalent to the number of the first input ports 1 in a column and the number of every two columns of ports in the P columns of first output ports 21 being the same.
  • the WSS includes M input ports and N output ports.
  • the M input ports include a column of first input ports 1 and P groups of second input ports 22, which is equivalent to having P+1 groups of input ports, and the numbers of at least two groups of input ports in the P+1 groups of input ports are different, which is equivalent to having at least two columns of ports in a column of first input ports 1 and P columns of first output ports 21 that are different in number.
  • P takes a value of 1, the number of a column of first input ports 1 is k, the number of a column of first output ports 21 is q, the total number of ports is equal to M, and k is not equal to q.
  • the number of ports in each column of a column of first input ports 1 and P columns of first output ports 21 is the same, and the arrangement heights arranged in the first direction are the same.
  • P takes a value of 1, which is equivalent to the presence of two columns of ports in the WSS, and the light spots of the output optical signals of the two columns of ports mapped to the optical switching engine 3 completely overlap in the first direction.
  • the solid ellipse indicates that the output optical signal of one column of ports is mapped to the light spot of the optical switching engine 3
  • the dotted ellipse indicates that the output optical signal of the other column of ports is mapped to the light spot of the optical switching engine 3.
  • the number of ports in each column of a column of first input ports 1 and P columns of first output ports 21 is the same, and the arrangement heights are staggered in the first direction.
  • P takes a value of 1, which is equivalent to the presence of two columns of ports in the WSS, and the light spots of the output optical signals of the two columns of ports mapped to the optical switching engine 3 partially overlap in the first direction.
  • the solid ellipse indicates that the output optical signal of one column of ports is mapped to the light spot of the optical switching engine 3
  • the dotted ellipse indicates that the output optical signal of the other column of ports is mapped to the light spot of the optical switching engine 3.
  • the size of the optical switching engine 3 in the first direction can be reduced, and the more light spots overlap in the first direction, the more the size of the optical switching engine 3 in the first direction can be reduced.
  • the number of ports in at least two columns of the first input port 1 in a column and the first output port 21 in the P column is different.
  • the optical switching engine 3 may be LCOS, MEMS reflector array, DMD or DLP, etc.
  • the optical switching engine 3 may be controlled by the target controller mentioned above to achieve the deflection of the angle of the incident light signal.
  • the reflection module 05 can be controlled by the target controller mentioned above to achieve the deflection of the angle of the incident light signal.
  • a client-side board is also provided in the embodiment of the present application, see Figure 24, and the client-side board includes the two WSSs mentioned above.
  • the two WSSs are used for wavelet processing and wavelet processing respectively. It is assumed that the two WSSs include a first wavelength selection switch and a second wavelength selection switch.
  • the first wavelength selection switch is used for wavelet processing.
  • the first wavelength selection switch is used to switch the WDM signal sent by the line-side device into a single-wavelength optical signal for output, and the second wavelength selection switch is used to switch the optical signal input by the wavelet to the line-side device.
  • the line-side device is used to connect the transmission optical fiber on the line side, and the line-side device includes a plurality of 1 ⁇ L wavelength selection switches.
  • the client side board receives optical signals of multiple bands and is used to send optical signals of multiple bands.
  • the client side board also includes a wavelength splitter module and a wavelength combiner module.
  • the optical signals of multiple bands include an optical signal of a first band and an optical signal of a second band as an example for explanation.
  • the wavelength splitting module receives a combined signal from the line side device, the combined signal including an optical signal of a first wavelength band and an optical signal of a second wavelength band, the wavelength splitting module performs wavelength splitting processing on the optical signal of the first wavelength band and the optical signal of the second wavelength band, and inputs the optical signal of the first wavelength band and the optical signal of the second wavelength band to the first wavelength selective switch as inputs of a column of first input ports 1 and an input of the port switching component 2, respectively.
  • the processing of the first wavelength selective switch refers to the description in the foregoing text and will not be repeated here.
  • the second wavelength selective switch receives the optical signal of the first wavelength band and the optical signal of the second wavelength band of the added wave, exchanges the optical signal of the first wavelength band and the optical signal of the second wavelength band, and outputs the single-wavelength optical signal to the combining module.
  • the combining module combines the single-wavelength optical signals and outputs the combined optical signal to the line side device.
  • the dotted line represents the optical signal of the first wavelength band
  • the solid line represents the optical signal of the second wavelength band.
  • the client side board further includes a client device, which is a branch board in the client side board, and is used to receive an optical signal sent by the first wavelength selective switch and to send an optical signal to the second wavelength selective switch.
  • a client device which is a branch board in the client side board, and is used to receive an optical signal sent by the first wavelength selective switch and to send an optical signal to the second wavelength selective switch.
  • a node is also provided in an embodiment of the present application, which node may be a ROADM, and the node includes the two WSSs and line-side equipment mentioned above, the two WSSs are client-side WSSs, which are used for wave addition processing and wave drop processing, respectively, and the line-side equipment includes at least one 1 ⁇ L WSS, where L is an integer greater than 1, wherein the 1 ⁇ L WSS includes 1 input port and L output ports, or the 1 ⁇ L WSS includes L input ports and one output port.
  • the WDM signal entering the node from the line side is wavelength selectively routed through the 1 ⁇ L WSS and connected to other 1 ⁇ L WSSs and the client-side WSS.
  • each 1 ⁇ L WSS receives the wavelength selective routing information from other 1 ⁇ L WSSs and the client-side WSS.
  • the optical signals of the WSS are converged and then transmitted.
  • the number of input ports of the WSS on the client side depends on the number of dimensions on the line side
  • the number of output ports of the WSS on the client side depends on the number of client devices connected to the client side.
  • the number of input ports of the WSS on the client side also increases.
  • the WSS provided in the embodiment of the present application, even if the number of input ports increases, the volume of the WSS will not increase significantly, which is convenient for expansion.
  • nodes can serve multiple bands.
  • two independent WSSs are required to process the optical signals of the C band and the L band respectively when uploading, and two independent WSSs are also required to process the optical signals of the C band and the L band respectively when downloading. This will cause the space occupied by the WSS on the client side in the entire node to double.
  • optical signals of multiple bands are input into the WSS as multiple columns of optical signals, so that one WSS can process optical signals of multiple bands at the same time when uploading, and one WSS can process optical signals of multiple bands at the same time when downloading.
  • Figure 27 shows a schematic diagram of a shared WSS for the C band and the L band.
  • the solid line represents the optical signal of the C band
  • the dotted line represents the optical signal of the L band.
  • the optical signals received by the WSS on the client side from each line side include C-band and L-band optical signals.
  • the signals are firstly processed by the demultiplexing module, and the C-band optical signals and L-band optical signals are input to the WSS as the input of a column of first input ports 1 and the input of the port switching component 2, respectively.
  • the processing of the WSS refers to the description in the previous text and will not be repeated here.
  • the WSS receives the C-band optical signals and L-band optical signals on the upper wave, exchanges the C-band optical signals and L-band optical signals, and outputs the single-wavelength optical signals to the combining module.
  • the combining module combines the single-wavelength optical signals and outputs the combined optical signals to the line side.
  • the embodiment of the present application when processing C-band and L-band optical signals, the embodiment of the present application can use two WSSs to achieve the add and drop wave functions, while the current solution requires the use of four WSSs. Therefore, using the WSS in the embodiment of the present application can reduce the number of WSSs used in the node.
  • a node which includes the client-side board mentioned above and at least one 1 ⁇ L WSS, where L is an integer greater than 1.
  • WSS can also be considered as an add-drop wavelength selective switch (ADWSS).
  • ADWSS add-drop wavelength selective switch
  • the words such as the term “first” and “second” are used to distinguish the same or similar items with substantially the same effects and functions. It should be understood that there is no logical or temporal dependency between the “first” and “second”, nor is the quantity and execution order limited. It should also be understood that although the following description uses the terms “first” and “second” to describe various elements, these elements should not be limited by the terms. These terms are only used to distinguish one element from another.
  • the first input port can be referred to as the second input port, and similarly, the second input port can be referred to as the first input port. Both the first input port and the second input port can be input ports, and in some cases, can be separate and different input ports.

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  • Mechanical Light Control Or Optical Switches (AREA)

Abstract

La présente demande se rapporte au domaine technique des communications optiques, et concerne un commutateur sélectif en longueur d'onde, une carte côté client et un nœud. Le commutateur sélectif en longueur d'onde comprend : une colonne de premiers ports d'entrée agencés dans une première direction et utilisés pour délivrer en sortie une colonne de signaux optiques ; un ensemble de commutation de port comprenant p colonnes de premiers ports de sortie et utilisé pour recevoir p groupes de signaux optiques et ajuster le premier port de sortie correspondant à chaque signal optique dans chaque groupe de signaux optiques, de façon à délivrer p colonnes de signaux optiques, des points lumineux de signaux optiques de sortie de la colonne de premiers ports d'entrée et d'au moins deux colonnes de ports parmi les p colonnes de premiers ports de sortie mappés à un moteur de commutation optique se chevauchant dans la première direction ; un ensemble de dispersion utilisé pour effectuer un traitement de dispersion sur des signaux optiques incidents ; et le moteur de commutation optique utilisé pour réfléchir et émettre les signaux optiques incidents. Dans le commutateur sélectif en longueur d'onde, des signaux optiques d'entrée sont divisés en de multiples colonnes pour une entrée, de telle sorte que le nombre de rangées de points lumineux devant être agencés sur le moteur de commutation optique est réduit, et ainsi, même si le nombre de ports d'entrée est augmenté, la taille du moteur de commutation optique dans la première direction n'est pas fortement augmentée.
PCT/CN2023/104668 2022-11-30 2023-06-30 Commutateur sélectif en longueur d'onde, carte côté client et nœud Ceased WO2024113855A1 (fr)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100172646A1 (en) * 2008-02-07 2010-07-08 Paul Colbourne M x n wavelength selective optical switch
WO2017008208A1 (fr) * 2015-07-10 2017-01-19 华为技术有限公司 Commutation de sélection de longueur d'onde, multiplexeur à insertion-extraction optique reconfigurable et procédé de sélection de longueur d'onde
CN113740971A (zh) * 2020-05-30 2021-12-03 华为技术有限公司 光交换装置、重定向方法、可重构光分插复用器及系统
CN114063215A (zh) * 2020-07-30 2022-02-18 华为技术有限公司 一种波长选择开关和光交换设备、系统

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100172646A1 (en) * 2008-02-07 2010-07-08 Paul Colbourne M x n wavelength selective optical switch
WO2017008208A1 (fr) * 2015-07-10 2017-01-19 华为技术有限公司 Commutation de sélection de longueur d'onde, multiplexeur à insertion-extraction optique reconfigurable et procédé de sélection de longueur d'onde
CN113740971A (zh) * 2020-05-30 2021-12-03 华为技术有限公司 光交换装置、重定向方法、可重构光分插复用器及系统
CN114063215A (zh) * 2020-07-30 2022-02-18 华为技术有限公司 一种波长选择开关和光交换设备、系统

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