Wavelength selection switch, single board, optical switching equipment and system

Abstract

The invention discloses a wavelength selection switch, a single board, optical switching equipment and a system, and belongs to the technical field of communication. The wavelength selection switch comprises a first input port for transmitting a first multi-wavelength optical signal to a light beam deflection assembly; the light beam deflection assembly deflects the first multi-wavelength optical signal by a first angle and then transmits the first multi-wavelength optical signal to the dispersion module through the first optical switching engine; the dispersion module decomposes the first multi-wavelength optical signal into a plurality of first single-wavelength optical signals and transmits the plurality of first single-wavelength optical signals to a plurality of first positions of the second optical switching engine, and the plurality of first single-wavelength optical signals are reflected back to the dispersion module at the plurality of first positions; the dispersion module transmits a first optical signal to the light beam deflection assembly through the first optical switching engine, and the first optical signal comprises a plurality of first single-wavelength optical signals; and under the condition that the wavelength selection switch is powered off, the light beam deflection assembly transmits the first optical signal to the direction except the port included by the wavelength selection switch. According to the invention, signal crosstalk can be avoided.

Description

Technical Field

[0001] The present application relates to the field of optical communication technology, and in particular to a wavelength selective switch, a single board, an optical switching device and a system. Background Art

[0002] With the development of optical communication technology, optical switching devices that use optical signals for communication are increasingly widely used. For example, the optical switching device may be a reconfigurable optical add drop multiplexer (ROADM).

[0003] A wavelength selective switch (WSS) is an important component of a ROADM. The wavelength selective switch has at least one input port and at least one output port. The WSS can transmit an optical signal input from a certain input port to a target output port corresponding to the input port, and output the optical signal from the target output port. The at least one output port includes the target output port.

[0004] However, currently, when the WSS is powered off, the WSS may transmit the optical signal inputted from the input port to other output ports, which are output ports other than the target output port, thus generating crosstalk to the optical signals on the other output ports. Summary of the invention

[0005] The present application provides a wavelength selective switch, a single board, an optical switching device and a system to avoid signal crosstalk. The technical solution is as follows:

[0006] In a first aspect, the present application provides a wavelength selection switch, which includes: a first input port, a beam deflection component, a first optical switching engine, a dispersion module, and a second optical switching engine. The first input port is used to transmit a first multi-wavelength optical signal to the beam deflection component. The beam deflection component is used to deflect the first multi-wavelength optical signal by a first angle and transmit it to the first optical switching engine. The first optical switching engine is used to transmit the first multi-wavelength optical signal deflected by the first angle to the dispersion module. The dispersion module is used to decompose the first multi-wavelength optical signal transmitted by the first optical switching engine into a plurality of first single-wavelength optical signals, and transmit the plurality of first single-wavelength optical signals to a plurality of first positions of the second optical switching engine, and the plurality of first single-wavelength optical signals are reflected back to the dispersion module at the plurality of first positions. The dispersion module is also used to merge the plurality of first single-wavelength optical signals that have been reflected into a first optical signal, and transmit the first optical signal to the first optical switching engine, and the first optical signal includes the plurality of first single-wavelength optical signals. The first optical switching engine is also used to transmit the first optical signal to the beam deflection component. When the wavelength selective switch is powered off, the light beam deflection assembly is further used to transmit the first optical signal transmitted through the first optical switching engine to a direction other than the port included in the wavelength selective switch.

[0007] Since the beam deflection assembly can also deflect the first multi-wavelength optical signal input from the first input port by the first angle when the wavelength selective switch is powered off, the first multi-wavelength optical signal after being deflected by the first angle will not be parallel to the optical axis of the first input port. In this way, after the dispersion module decomposes the first multi-wavelength optical signal after being deflected by the first angle into a plurality of first single-wavelength optical signals, the plurality of first single-wavelength optical signals can be transmitted to a plurality of first positions of the second optical switching engine. After the plurality of first single-wavelength optical signals are reflected back to the dispersion module from the plurality of first positions, the dispersion module combines the plurality of reflected first single-wavelength optical signals into a first optical signal, and transmits the first optical signal to the beam deflection assembly through the first optical switching engine. The beam deflection assembly transmits the first optical signal to a direction other than the port included in the wavelength selective switch, thereby preventing the first optical signal from generating crosstalk with a signal on any port in the wavelength selective switch, i.e., avoiding signal crosstalk.

[0008] In a possible implementation, the wavelength selective switch further includes at least one first output port corresponding to the first input port. The first input port is further used to transmit a second multi-wavelength optical signal to the beam deflection assembly. The beam deflection assembly is further used to deflect the second multi-wavelength optical signal by a first angle and transmit it to the first optical switching engine. The first optical switching engine is further used to deflect the second multi-wavelength optical signal after being deflected by the first angle by a second angle and transmit it to the dispersion module. The dispersion module is further used to decompose the second multi-wavelength optical signal transmitted through the first optical switching engine into a plurality of second single-wavelength optical signals, transmit the plurality of second single-wavelength optical signals to a plurality of second positions of the second optical switching engine, and the plurality of second single-wavelength optical signals are reflected back to the dispersion module at the plurality of second positions. The dispersion module is further used to merge the plurality of reflected second single-wavelength optical signals into at least one second optical signal, and transmit at least one second optical signal to the first optical switching engine, each second optical signal including part or all of the plurality of second single-wavelength optical signals. When the wavelength selective switch is powered on, the first optical switching engine is further used to couple at least one second optical signal into at least one first output port.

[0009] When the wavelength selection switch is powered off, the beam deflection component deflects the second multi-wavelength optical signal input from the first input port by a first angle, and the first optical switching engine deflects the second multi-wavelength optical signal after the first angle is deflected by a second angle. In this way, the dispersion module decomposes the first multi-wavelength optical signal after the second angle is deflected into a plurality of second single-wavelength optical signals, and can successfully transmit the plurality of second single-wavelength optical signals to a plurality of second positions of the second optical switching engine. After the plurality of second single-wavelength optical signals are reflected back to the dispersion module from the plurality of second positions, the dispersion module transmits at least one second optical signal to the first optical switching engine, and the first optical switching engine couples the at least one second optical signal into at least one first output port. In this way, it is ensured that the optical signal input from the first input port can be successfully output from at least one first output port. In addition, since the beam deflection component deflects the second multi-wavelength optical signal by the first angle, the angle at which the first optical switching engine needs to deflect the second multi-wavelength optical signal can be reduced, and the power consumption of the first optical switching engine can be reduced.

[0010] In another possible implementation, the angle of the second multi-wavelength optical signal transmitted to the dispersion module is equal to the third angle, and the third angle is the angle at which the beam deflection component and the first optical switching engine jointly deflect the second multi-wavelength optical signal. In this way, the angle at which the first optical switching engine needs to deflect the second multi-wavelength optical signal can be reduced, and the power consumption of the first optical switching engine can be reduced.

[0011] In another possible implementation, the wavelength selective switch further includes a second input port, and the second input port is symmetrical with the first input port relative to the optical axis of the wavelength selective switch. The dispersion reflection module is used to transmit the first optical signal to a position corresponding to the second input port on the beam deflection assembly, and the first optical signal is transmitted in a direction outside the second input port, thereby avoiding crosstalk between the first optical signal and the signal in the second input port.

[0012] In another possible implementation, the beam deflection assembly includes a lens unit corresponding to the first input port, there is an offset between the optical axis of the first input port and the optical axis of the lens unit, and the first angle is constrained by the offset and the curvature of the lens unit, so that the beam deflection assembly can deflect the first multi-wavelength optical signal input from the first input port by the first angle.

[0013] In another possible implementation, the beam deflection assembly includes a prism corresponding to the first input port, and the deflection angle of the prism to the incident light beam is equal to the first angle, so that the beam deflection assembly can deflect the first multi-wavelength optical signal input from the first input port by the first angle.

[0014] In another possible implementation, the beam deflection assembly and the first optical switching engine are integrated into a module, which includes a reflector unit corresponding to the first input port, the reflector unit is a curved structure, there is an offset between the optical axis of the first input port and the optical axis of the reflector unit, and the first angle is constrained by the offset and the curvature of the reflector unit, so that the beam deflection assembly can deflect the first multi-wavelength optical signal input from the first input port by the first angle.

[0015] In another possible implementation, the first angle is greater than 0 degrees and less than 10 degrees.

[0016] In a second aspect, the present application provides a method for transmitting an optical signal, the method being applied to a wavelength selective switch, the wavelength selective switch comprising a first input port, a beam deflection component, a first optical switching engine, a dispersion module, and a second optical switching engine. In the method, the first input port transmits a first multi-wavelength optical signal to the beam deflection component. The beam deflection component deflects the first multi-wavelength optical signal by a first angle and transmits it to the first optical switching engine. The first optical switching engine transmits the first multi-wavelength optical signal deflected by the first angle to the dispersion module. The dispersion module decomposes the first multi-wavelength optical signal transmitted by the first optical switching engine into a plurality of first single-wavelength optical signals, transmits the plurality of first single-wavelength optical signals to a plurality of first positions of the second optical switching engine, and the plurality of first single-wavelength optical signals are reflected back to the dispersion module at the plurality of first positions. The dispersion module combines the plurality of first single-wavelength optical signals after reflection into a first optical signal, and transmits the first optical signal to the first optical switching engine, the first optical signal comprising the plurality of first single-wavelength optical signals. The first optical switching engine transmits the first optical signal to the beam deflection component. When the wavelength selective switch is powered off, the beam deflection assembly transmits the first optical signal transmitted through the first optical switching engine to a direction other than the port included in the wavelength selective switch.

[0017] Since the beam deflection assembly can also deflect the first multi-wavelength optical signal input from the first input port by the first angle when the wavelength selective switch is powered off, the first multi-wavelength optical signal after being deflected by the first angle will not be parallel to the optical axis of the first input port. In this way, after the dispersion module decomposes the first multi-wavelength optical signal after being deflected by the first angle into a plurality of first single-wavelength optical signals, the plurality of first single-wavelength optical signals can be transmitted to a plurality of first positions of the second optical switching engine. After the plurality of first single-wavelength optical signals are reflected back to the dispersion module from the plurality of first positions, the dispersion module combines the plurality of reflected first single-wavelength optical signals into a first optical signal, and transmits the first optical signal to the beam deflection assembly through the first optical switching engine. The beam deflection assembly transmits the first optical signal to a direction other than the port included in the wavelength selective switch, thereby preventing the first optical signal from generating crosstalk with a signal on any port in the wavelength selective switch, i.e., avoiding signal crosstalk.

[0018] In a possible implementation, the wavelength selective switch further includes at least one first output port corresponding to the first input port. The first input port transmits a second multi-wavelength optical signal to the beam deflection assembly. The beam deflection assembly deflects the second multi-wavelength optical signal by a first angle and transmits it to the first optical switching engine. The first optical switching engine deflects the second multi-wavelength optical signal after being deflected by the first angle by a second angle and transmits it to the dispersion module. The dispersion module decomposes the second multi-wavelength optical signal transmitted by the first optical switching engine into a plurality of second single-wavelength optical signals, transmits the plurality of second single-wavelength optical signals to a plurality of second positions of the second optical switching engine, and the plurality of second single-wavelength optical signals are reflected back to the dispersion module at the plurality of second positions. The dispersion module combines the plurality of reflected second single-wavelength optical signals into at least one second optical signal, and transmits at least one second optical signal to the first optical switching engine, each second optical signal including part or all of the plurality of second single-wavelength optical signals. When the wavelength selective switch is powered on, the first optical switching engine couples the at least one second optical signal into at least one first output port.

[0019] When the wavelength selection switch is powered off, the beam deflection component deflects the second multi-wavelength optical signal input from the first input port by a first angle, and the first optical switching engine deflects the second multi-wavelength optical signal after the first angle is deflected by a second angle. In this way, the dispersion module decomposes the first multi-wavelength optical signal after the second angle is deflected into a plurality of second single-wavelength optical signals, and can successfully transmit the plurality of second single-wavelength optical signals to a plurality of second positions of the second optical switching engine. After the plurality of second single-wavelength optical signals are reflected back to the dispersion module from the plurality of second positions, the dispersion module transmits at least one second optical signal to the first optical switching engine, and the first optical switching engine couples the at least one second optical signal into at least one first output port. In this way, it is ensured that the optical signal input from the first input port can be successfully output from at least one first output port. In addition, since the beam deflection component deflects the second multi-wavelength optical signal by the first angle, the angle at which the first optical switching engine needs to deflect the second multi-wavelength optical signal can be reduced, and the power consumption of the first optical switching engine can be reduced.

[0020] In a third aspect, the present application provides a single board, comprising: the wavelength selection switch described in the first aspect or any possible implementation of the first aspect.

[0021] In a fourth aspect, the present application provides an optical switching device, comprising a plurality of boards, at least one of the plurality of boards being the board described in the third aspect.

[0022] In a possible implementation manner, the optical switching device is a reconfigurable optical branching multiplexer.

[0023] In a fifth aspect, the present application provides an optical network system, comprising: a plurality of optical switching devices, at least one optical switching device among the plurality of optical switching devices is the optical switching device described in the fourth aspect or any possible implementation of the fourth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of an optical switching device provided in an embodiment of the present application;

[0025] Figure 2 is a light path diagram in the port direction provided by an embodiment of the present application;

[0026] Figure 3 is a light path diagram in the dispersion direction provided by an embodiment of the present application;

[0027] Figure 4 This is a light path diagram provided by an embodiment of the present application when the wavelength selective switch is powered off;

[0028] Figure 5 is a schematic diagram of the structure of a wavelength selective switch provided in an embodiment of the present application;

[0029] Figure 6 It is an optical path diagram provided by an embodiment of the present application when the wavelength selective switch is powered on;

[0030] Figure 7 is a schematic diagram of the structure of another wavelength selective switch provided in an embodiment of the present application;

[0031] Figure 8 This is another optical path diagram provided by an embodiment of the present application when the wavelength selective switch is powered on;

[0032] Fig. 9 is a schematic diagram of the structure of another wavelength selective switch provided in an embodiment of the present application;

[0033] Fig.10 This is another optical path diagram provided by an embodiment of the present application when the wavelength selective switch is powered on;

[0034] Fig.11 is a schematic diagram of the structure of another wavelength selective switch provided in an embodiment of the present application;

[0035] Fig.12 is a schematic diagram of the structure of another wavelength selective switch provided in an embodiment of the present application;

[0036] Fig.13 is a schematic diagram of the structure of another wavelength selective switch provided in an embodiment of the present application;

[0037] Fig.14It is a flow chart of a method for transmitting optical signals provided in an embodiment of the present application. DETAILED DESCRIPTION

[0038] The implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0039] The present application provides an optical network system, which includes a plurality of optical switching devices, wherein optical signals can be exchanged between the optical switching devices through optical fibers.

[0040] In some embodiments, the optical switching device may be a device such as ROADM that can switch optical signals. Among them, ROADM can realize flexible scheduling and intelligent operation and maintenance of all-optical network services, and has wavelength-level scheduling and multi-dimensional flexible networking capabilities. After introducing ROADM into the optical network system, operators can quickly provide wavelength-level services, facilitate network planning, reduce operating expenses, facilitate maintenance, and reduce maintenance costs.

[0041] For example, Figure 1 A schematic diagram of the structure of a ROADM provided in an embodiment of the present application is shown in FIG. Figure 1 As shown, ROADM includes multiple boards, some of which are located in Figure 1 The other part of the board is located on the line side of Figure 1 The client side of the ROADM. A board on the client side connects the transmitter (transmitter, TX) and the receiver (receiver, RX). The board can also realize optical switching. ROADM uses multiple boards to exchange light to realize ROADM optical switching.

[0042] The board includes at least one wavelength selective switch (WSS), Figure 1 In the example, a single board includes multiple wavelength selective switches. Some wavelength selective switches have 1 input port and N output ports (expressed as 1×N, N>1), and the wavelength selective switch can transmit the optical signal (such as wavelength division multiplexing (WDM) signal) from the one input port (also called the multiplexing port) to any one or more of the N output ports (also called the splitting ports). It can be understood that the wavelength selective switch can also have multiple input ports and multiple output ports, and the wavelength selective switch can transmit the optical signal from any input port to any output port. In addition to at least one wavelength selective switch, the single board can also include other components, which are not listed here.

[0043] ROADM can transmit an optical signal of any wavelength at any input port of the ROADM to any output port of the ROADM by connecting the ports of multiple wavelength selective switches.

[0044] In some embodiments, the optical switching device may also be a device different from the ROADM, the number of boards in the device (>1) is different from the number of boards in the ROADM, and / or the connection relationship between the boards in the device is different from the connection relationship between the boards in the ROADM. Therefore, the optical switching device provided in the present application may include multiple boards, and there is a connection relationship between these boards. Through the connection between the boards, optical switching of the optical switching device can be achieved. In addition to multiple boards, the optical switching device may also include other components. For example, the optical switching device also includes a power module, a heat dissipation module, etc. The power module is used to supply power to the board, and the heat dissipation module is used to dissipate heat from the board.

[0045] Based on the above, it can be seen that the wavelength selective switch is an important component of the single board, optical switching equipment and optical switching system. Figure 2 The structure of the wavelength selective switch is further introduced.

[0046] For example, Figure 2 The optical path diagram of a wavelength selective switch in the port direction x provided in an embodiment of the present application, the orthographic projection of the transmission path of the optical signal between the ports of the wavelength selective switch on the reference plane xz is Figure 2 The optical path diagram shown. Among them, the orthographic projections of the multiple ports of the wavelength selective switch in the reference plane xz can be arranged in sequence along the port direction x. The arrangement direction of the multiple ports can be the port direction x, or can be different from the port direction x, which is not limited in this application. The orthographic projection of the transmission path on the reference plane xz refers to: when light perpendicular to the reference plane xz is irradiated from the side of the transmission path away from the reference plane xz to the reference plane xz, the projection of the transmission path on the reference plane xz.

[0047] See also Figure 2 , any input port of the wavelength selective switch corresponds to at least one output port (such as Figure 2 The input port COM corresponds to the output ports DM1, DM2, and DM3). In the port direction x, for the multi-wavelength optical signal input from the input port COM of the wavelength selection switch, the first optical switching engine deflects the multi-wavelength optical signal by an angle and transmits it to the dispersion module. The dispersion module decomposes the multi-wavelength optical signal into multiple single-wavelength optical signals, and transmits the multiple single-wavelength optical signals to multiple positions L of the second optical switching engine. The multiple single-wavelength optical signals are reflected back to the dispersion module at the multiple positions L of the second optical switching engine. The dispersion module transmits at least one optical signal to the first optical switching engine, and each optical signal includes part or all of the multiple single-wavelength optical signals. The first optical switching engine couples the at least one optical signal into the at least one output port.

[0048] Optionally, the dispersion module sends a signal to at least one target location (such as Figure 2 The first optical switching engine transmits at least one optical signal to a target position (D1, D2, D3) in the output port. For a target position corresponding to each output port and an optical signal transmitted to the target position, the first optical switching engine deflects the optical signal at the target position so that the optical signal is parallel to the optical axis of the output port, and then transmits the deflected optical signal to the output port. In this way, the first optical switching engine can couple the at least one optical signal into the at least one output port.

[0049] The reference plane xz is perpendicular to the dispersion direction y. For example, Figure 3 The optical path diagram of the wavelength selective switch provided in the embodiment of the present application in the dispersion direction y is as follows: for a multi-wavelength optical signal input from the input port COM of the wavelength selective switch, in the dispersion direction y, the projection of the transmission path of the multi-wavelength optical signal on the reference plane yz is as follows: Figure 3 As shown. The dispersion module decomposes the multi-wavelength optical signal into multiple single-wavelength optical signals in the dispersion direction y. The dispersion module transmits the multiple single-wavelength optical signals to multiple positions of the first optical switching engine in the dispersion direction y (such as Figure 3 The plurality of single-wavelength optical signals are reflected back to the dispersion module at the plurality of positions L1, L2, L3, L4, and L5.

[0050] See also Figure 2 The reflection angles of the multiple single-wavelength optical signals can be the same or different. If the reflection angles of the multiple single-wavelength optical signals are the same, the dispersion module combines the multiple single-length optical signals reflected back into one optical signal, and the first optical switching engine couples the one optical signal into one output port.

[0051] If the reflection angles of the multiple single-wavelength optical signals are different, for any reflection angle, at least one single-wavelength optical signal may be reflected at the reflection angle, and the dispersion module can combine the at least one single-wavelength optical signal reflected back into one optical signal, so that the dispersion module can obtain multiple optical signals, each of which includes a portion of the multiple single-wavelength optical signals. The first optical switching engine couples the multiple optical signals into multiple output ports.

[0052] The first optical switching engine deflects the angle of the multi-wavelength optical signal input from the input port only when it is powered on. Figure 4When the wavelength selective switch is powered off, for the multi-wavelength optical signal input from the input port COM, the first optical switching engine will not deflect the angle of the multi-wavelength optical signal, and the multi-wavelength optical signal is directly transmitted to the dispersion module after passing through the first optical switching engine. The multi-wavelength optical signal output from the first optical switching engine is parallel to the optical axis of the input port. The dispersion module decomposes the multi-wavelength optical signal into multiple single-wavelength optical signals, and transmits the multiple single-wavelength optical signals to the optical axis position of the second optical switching engine. The multiple single-wavelength optical signals are reflected back to the dispersion module in the second optical switching engine, and the dispersion module combines the multiple single-wavelength optical signals into one optical signal and transmits the optical signal to the first optical switching engine. The optical signal is symmetrical with the multi-wavelength optical signal relative to the optical axis of the wavelength selective switch, and the optical signal is parallel to the optical axis of the output port DM4. The input port COM and the output port DM4 are symmetrical relative to the optical axis of the wavelength selective switch, so the optical signal is transmitted to the output port DM4 after passing through the first optical switching engine. The output port DM4 may not be the output port corresponding to the input port COM, and the optical signal generates crosstalk with the signal in the output port DM4.

[0053] To solve this crosstalk problem, see Figure 5 The embodiment of the present application provides a wavelength selective switch 500, including at least one port group 501, a beam deflection component 502, a first optical switching engine 503, a dispersion module 504, and a second optical switching engine 505. For each port group 501, the port group 501 includes: at least one input port and at least one output port corresponding to each input port.

[0054] The beam deflection assembly 502 has the function of angularly deflecting the input optical signal. The angle at which the beam deflection assembly 502 deflects the input optical signal is fixedly configured, regardless of whether the wavelength selective switch 500 is powered on.

[0055] The at least one input port includes a first input port COM1, and the port group includes at least one first output port corresponding to the first input port COM1. Figure 5 , assuming that the at least one first output port includes a first output port DM1 and a first output port DM3. When the wavelength selective switch 500 is powered off,

[0056] The first input port COM1 is used to receive a first multi-wavelength optical signal and transmit the first multi-wavelength optical signal to the beam deflection component 502;

[0057] The beam deflection component 502 is used to deflect the first multi-wavelength optical signal by a first angle and then transmit it to the first optical switching engine 503;

[0058] The first optical switching engine 503 is used to transmit the first multi-wavelength optical signal after being deflected at a first angle to the dispersion module 504;

[0059] The dispersion module 504 is used to decompose the first multi-wavelength optical signal transmitted by the first optical switching engine 503 into a plurality of first single-wavelength optical signals, transmit the plurality of first single-wavelength optical signals to a plurality of first positions 51 of the second optical switching engine 505, and reflect the plurality of first single-wavelength optical signals back to the dispersion module 504 at the plurality of first positions 51 of the second optical switching engine 505;

[0060] The dispersion module 504 is further used to combine the multiple first single-wavelength optical signals reflected by the multiple first positions 51 into a first optical signal, and transmit the first optical signal to the first optical switching engine 503;

[0061] The first optical switching engine 503 is further used to transmit the first optical signal to the beam deflection component 502;

[0062] When the wavelength selective switch 500 is powered off, the beam deflection assembly 502 is further used to transmit the first optical signal transmitted through the first optical switching engine 503 to a direction other than the port included in the wavelength selective switch 500. In this way, the first optical signal is prevented from being transmitted to any port included in the wavelength selective switch 500, thereby preventing the first optical signal from generating crosstalk with a signal in any port, that is, preventing the occurrence of signal crosstalk.

[0063] When the wavelength selective switch 500 is powered off, since the beam deflection component 502 still deflects the input first multi-wavelength optical signal by the first angle, the first multi-wavelength optical signal transmitted to the dispersion module 504 is not parallel to the optical axis of the first input port COM1, so that the first optical signal transmitted to the first optical switching engine 503 by the dispersion module 504 will not be parallel to the optical axis of any port on the wavelength selective switch 500.

[0064] Since the wavelength selective switch is powered off, the first optical switching engine 503 does not deflect the first optical signal. After passing through the first optical switching engine 503, the first optical signal is transmitted to a certain position (such as Figure 5 Position 11 in the port group 501), the position 11 is associated with a port in the port group 501 (such as Figure 5 The first optical signal corresponds to the input port COM4 in the wavelength selective switch 500, and the port COM4 is symmetrical with the first input port COM1 relative to the optical axis of the wavelength selective switch 500. Since the first optical signal is not parallel to the optical axis of the port COM4, ​​the first optical signal cannot be transmitted to the port COM4, ​​thereby not generating crosstalk with the signal in the port COM4.

[0065] In some embodiments, the beam deflecting component 502 may further deflect the angle of the first optical signal at the position 11 to expand the angle between the first optical signal and the optical axis of the port COM4.

[0066] See also Figure 6 , when the wavelength selective switch 500 is powered on,

[0067] The first input port COM1 is further used to receive a second multi-wavelength optical signal and transmit the second multi-wavelength optical signal to the beam deflection component 502;

[0068] The beam deflection component 502 is further used to deflect the second multi-wavelength optical signal by a first angle and transmit it to the first optical switching engine 503;

[0069] The first optical switching engine 503 is further configured to deflect the second multi-wavelength optical signal after being deflected by the first angle by a second angle and transmit the deflected signal to the dispersion module 504;

[0070] The dispersion module 504 is further used to decompose the second multi-wavelength optical signal transmitted through the first optical switching engine 503 into a plurality of second single-wavelength optical signals, transmit the plurality of second single-wavelength optical signals to a plurality of second positions 52 of the second optical switching engine 505, and the plurality of second single-wavelength optical signals are reflected back to the dispersion module 504 at the plurality of second positions 52 of the second optical switching engine 505;

[0071] The dispersion module 504 is further configured to combine the plurality of second single-wavelength optical signals reflected by the plurality of second positions 52 into at least one second optical signal, and transmit the at least one second optical signal to the first optical switching engine 503;

[0072] The first optical switching engine 503 is further configured to couple the at least one second optical signal into the at least one first output port.

[0073] Optionally, each second optical signal includes part or all of the plurality of second single-wavelength optical signals.

[0074] In some embodiments, for the sake of convenience, the angle of the second multi-wavelength optical signal transmitted to the dispersion module 504 is referred to as the first signal angle. The first signal angle is the angle at which the beam deflection component 502 and the first optical switching engine 503 jointly deflect the second multi-wavelength optical signal. The first signal angle is equal to the sum of the first angle and the second angle, or the first signal angle is equal to the difference between the first angle and the second angle.

[0075] In some embodiments, when the first signal angle is equal to the sum of the first angle and the second angle, the second angle that the first optical switching engine 503 needs to deflect the second multi-wavelength optical signal can be reduced, thereby reducing the amount of power input to the first optical switching engine 503, thereby saving power consumption of the first optical switching engine 503.

[0076] In some embodiments, for each second optical signal of at least one second optical signal, the first optical switching engine 503 can deflect the angle of the second optical signal so that the second optical signal is parallel to the optical axis of a first output port, thereby transmitting the second optical signal to the first output port.

[0077] For example, see Figure 6 , the dispersion module 504 transmits two second optical signals to the first optical switching engine 503, each second optical signal including a portion of the second single-wavelength optical signals. For one of the second optical signals, the first optical switching engine 503 deflects the angle of the second optical signal so that the deflected second optical signal is parallel to the optical axis of the first output port DM1, and transmits it to the first output port DM1 through the beam deflection component 502. For the other second optical signal, the first optical switching engine 503 deflects the angle of the other second optical signal so that the deflected second optical signal is parallel to the optical axis of the first output port DM3, and transmits it to the first output port DM3 through the beam deflection component 502.

[0078] In some embodiments, the port group 501 may further include at least one other input port and at least one output port corresponding to each other input port. For two multi-wavelength optical signals input from any two input ports, the beam deflection component 502 deflects the two multi-wavelength optical signals at different angles, but the first optical switching engine 503 deflects the two multi-wavelength optical signals at different angles or at the same angles.

[0079] For example, see Figure 5 , the port group 501 further includes: a second input port COM2 and at least one second output port corresponding to the second input port COM2; exemplarily, see Figure 5 , the at least one second output port comprises a second output port DM4. When the wavelength selective switch 500 is powered off,

[0080] The second input port COM2 is used to transmit a third multi-wavelength optical signal to the beam deflection component 502;

[0081] The beam deflection component 502 is further used to deflect the third multi-wavelength optical signal by a third angle and transmit it to the first optical switching engine 503, wherein the first angle is not equal to the third angle;

[0082] The first optical switching engine 503 is further configured to transmit the third multi-wavelength optical signal deflected at a third angle to the dispersion module 504;

[0083] The dispersion module 504 is further used to decompose the third multi-wavelength optical signal transmitted through the first optical switching engine 503 into a plurality of third single-wavelength optical signals, transmit the plurality of third single-wavelength optical signals to a plurality of third positions 53 of the second optical switching engine 505, and the plurality of third single-wavelength optical signals are reflected back to the dispersion module 504 at the plurality of third positions 503 of the first optical switching engine 505;

[0084] The dispersion module 504 is further used to combine the multiple third single-wavelength optical signals reflected by the multiple third positions 503 into a third optical signal, and transmit the third optical signal to the first optical switching engine 503;

[0085] The first optical switching engine 503 is further used to transmit a third optical signal to the beam deflection component 502;

[0086] The beam deflection component 502 is further used to transmit the third optical signal transmitted through the first optical switching engine 503 to a direction other than the port included in the wavelength selective switch 500 .

[0087] When the wavelength selective switch 500 is powered off, since the beam deflection component 1 further deflects the input third multi-wavelength optical signal by a third angle, the third multi-wavelength optical signal transmitted to the dispersion module 504 is not parallel to the optical axis of the second input port COM2, so that the third optical signal transmitted by the dispersion module 504 to the first optical switching engine 503 will not be parallel to the optical axis of any port on the wavelength selective switch 500.

[0088] Since the wavelength selective switch 500 is powered off, the first optical switching engine 503 does not deflect the third optical signal, and the third optical signal is transmitted to a certain position (such as Figure 5 Position 12 in the port group 501), the position 12 is associated with a port in the port group 501 (such as Figure 5 The port COM3 is symmetrical with the second input port COM2 relative to the optical axis of the wavelength selective switch 500. Since the third optical signal is not parallel to the optical axis of the port COM3, the first optical signal cannot be transmitted to the port COM3, thereby not generating crosstalk with the signal in the port COM3.

[0089] In some embodiments, the beam deflecting component 502 may further deflect the angle of the first optical signal at the position 12 to expand the angle between the first optical signal and the optical axis of the port COM3.

[0090] See also Figure 6, when the wavelength selective switch 500 is powered on,

[0091] The second input port COM2 is further used to receive a fourth multi-wavelength optical signal and transmit the fourth multi-wavelength optical signal to the beam deflection component 502;

[0092] The beam deflection component 502 is further used to deflect the fourth multi-wavelength optical signal by a third angle and then transmit it to the first optical switching engine 503;

[0093] The first optical switching engine 503 is further used to transmit the fourth multi-wavelength optical signal after being deflected by the third angle to the dispersion module 504 after being deflected by a fourth angle, where the second angle is not equal to the fourth angle;

[0094] The dispersion module 504 is further used to decompose the fourth multi-wavelength optical signal transmitted through the first optical switching engine 503 into a plurality of fourth single-wavelength optical signals, transmit the plurality of fourth single-wavelength optical signals to a plurality of fourth positions 54 of the second optical switching engine 505, and the plurality of fourth single-wavelength optical signals are reflected back to the dispersion module 504 at the plurality of fourth positions 54 of the second optical switching engine 505;

[0095] The dispersion module 504 is further configured to combine the plurality of fourth single-wavelength optical signals reflected by the plurality of fourth positions 54 into at least one fourth optical signal, and transmit the at least one fourth optical signal to the first optical switching engine 503;

[0096] The first optical switching engine 503 is further configured to couple the at least one fourth optical signal into the at least one second output port.

[0097] Optionally, each fourth optical signal includes part or all of the plurality of fourth single-wavelength optical signals.

[0098] For example, see Figure 6 The dispersion module 504 transmits a fourth optical signal including the plurality of fourth single-wavelength optical signals to the first optical switching engine 503. The first optical switching engine 503 deflects the angle of the fourth optical signal so that the deflected fourth optical signal is parallel to the optical axis of the second output port DM4 and is transmitted to the second output port DM4 through the beam deflection component 502.

[0099] For the angle of the fourth multi-wavelength optical signal transmitted to the dispersion module 504, for the sake of convenience, the angle is called the second signal angle. The second signal angle is the angle at which the beam deflection component 502 and the first optical switching engine 503 jointly deflect the fourth multi-wavelength optical signal. The second signal angle is equal to the sum of the third angle and the fourth angle, or the second signal angle is equal to the difference between the third angle and the fourth angle.

[0100] In some embodiments, when the second signal angle is equal to the sum of the third angle and the fourth angle, the fourth angle that the first optical switching engine 503 needs to deflect the fourth multi-wavelength optical signal can be reduced, thereby reducing the amount of power input to the first optical switching engine 503, thereby saving power consumption of the first optical switching engine 503.

[0101] In some embodiments, the first signal angle of the second multi-wavelength optical signal and the second signal angle of the fourth multi-wavelength optical signal are different.

[0102] In some embodiments, the beam deflection assembly 502 may deflect the first multi-wavelength optical signal and the third multi-wavelength optical signal in the same direction, or may deflect the first multi-wavelength optical signal and the third multi-wavelength optical signal in opposite directions. For example, the beam deflection assembly 502 deflects the first multi-wavelength optical signal by a first angle in a clockwise direction and deflects the third multi-wavelength optical signal by a third angle, or deflects the first multi-wavelength optical signal by a first angle in a clockwise direction and deflects the third multi-wavelength optical signal by a third angle in a counterclockwise direction.

[0103] In some embodiments, the first optical switching engine 503 may deflect the second multi-wavelength optical signal and the fourth multi-wavelength optical signal in the same direction, or may deflect the second multi-wavelength optical signal and the fourth multi-wavelength optical signal in opposite directions. For example, the first optical switching engine 503 deflects the second multi-wavelength optical signal by a second angle in a clockwise direction and deflects the fourth multi-wavelength optical signal by a fourth angle, or deflects the second multi-wavelength optical signal by a second angle in a clockwise direction and deflects the fourth multi-wavelength optical signal by a fourth angle in a counterclockwise direction.

[0104] In some embodiments, the above embodiments take the example that at least one port group in the wavelength selective switch includes one port group. It is understandable that the at least one port group may also include multiple port groups, for example, the at least one port group includes: a first port group and a second port group, each of the first port group and the second port group includes at least one input port and at least one second port corresponding to each input port. The number of input ports in the first port group and the second port group may be the same or different, and the number of output ports in the first port group and the second port group may be the same or different. The single-wavelength optical signal obtained by decomposing the multi-wavelength optical signal from the input port in each port group is used to transmit to any output port in the port group.

[0105] In some embodiments, the ports in the first port group and the ports in the second port group may be symmetrically distributed, and the optical path of the optical signal transmitted between the ports of the first port group may be symmetrical with the optical path of the optical signal transmitted between the ports of the second port group, and the wavelength selective switch 500 may be called a twin wavelength selective switch. Of course, the ports in the first port group and the ports in the second port group may also be asymmetrically distributed, and the optical path of the optical signal transmitted between the ports of the first port group may not be symmetrical with the optical path of the optical signal transmitted between the ports of the second port group.

[0106] In some embodiments, the dispersion module 504 may be a transmissive dispersion module, or may be a reflective dispersion module.

[0107] See also Figure 7 or Figure 8 The dispersion module 504 is a transmissive dispersion module, and the dispersion module 504 includes a transmissive dispersion grating 5041 and a first lens 5042, and the transmissive dispersion grating 5041 and the first lens 5042 are located between the first optical switching engine 503 and the second optical switching engine 505. The dispersion grating 5041 is located between the first optical switching engine 503 and the first lens 5042, and the first lens 5042 is located between the dispersion grating 5041 and the second optical switching engine 505.

[0108] See also Figure 7 , when the wavelength selection switch 500 is powered off, the beam deflection component 502 is used to deflect the first multi-wavelength optical signal input from the first input port COM1 by a first angle and transmit it to the first optical switching engine 503, and the first multi-wavelength optical signal deflected by the first angle passes through the first optical switching engine 503 and is transmitted to the dispersion grating 5041;

[0109] The dispersion grating 5041 is used to decompose the first multi-wavelength optical signal after being deflected at the first angle into a plurality of first single-wavelength optical signals, and transmit the plurality of first single-wavelength optical signals to the first lens 5042;

[0110] The first lens 5042 is used to transmit the plurality of first single-wavelength optical signals transmitted through the first optical switching engine 503 to the plurality of first positions 51 of the second optical switching engine 505, and the plurality of first single-wavelength optical signals transmitted through the first lens 5042 are reflected back to the first lens 5042 at the plurality of first positions 51 of the second optical switching engine 505;

[0111] The first lens 5042 is further used to transmit the plurality of first single-wavelength optical signals reflected by the plurality of first positions 51 to the dispersion grating 5041;

[0112] The dispersion grating 5041 is further used to combine the multiple first single-wavelength optical signals transmitted through the first lens 5042 into a first optical signal, and transmit the first optical signal to the first optical switching engine 503. The first optical signal is transmitted to the beam deflection component 502 after passing through the first optical switching engine 503.

[0113] The beam deflection component 502 is also used to transmit the first optical signal transmitted through the first optical switching engine 503 to a direction other than the port included in the wavelength selective switch 500 .

[0114] In some embodiments, the first angle is determined based on the focal length of the first lens 5042 and the plurality of first positions 51 .

[0115] See also Figure 8 , when the wavelength selective switch 500 is powered on, the beam deflection component 502 is also used to deflect the second multi-wavelength optical signal input from the first input port COM1 by the first angle and then transmit it to the first optical switching engine 503;

[0116] The first optical switching engine 503 is further used to deflect the second multi-wavelength optical signal after being deflected by the first angle by a second angle and transmit it to the dispersion grating 5041;

[0117] The dispersion grating 5041 is further used to decompose the second multi-wavelength optical signal transmitted through the first optical switching engine 503 into a plurality of second single-wavelength optical signals, and transmit the plurality of second single-wavelength optical signals to the first lens 5042;

[0118] The first lens 5042 is further used to transmit the plurality of second single-wavelength optical signals to the plurality of second positions 52 of the second optical switching engine 505, and the plurality of second single-wavelength optical signals transmitted through the first lens 5042 are reflected back to the first lens 5042 at the plurality of second positions 52 of the second optical switching engine 505;

[0119] The first lens 5042 is further used to transmit the plurality of second single-wavelength optical signals reflected by the plurality of second positions 52 to the dispersion grating 5041;

[0120] The dispersion grating 5041 is further used to combine the multiple second single-wavelength optical signals transmitted through the first lens 5042 into at least one second optical signal, and transmit the at least one second optical signal to the first optical switching engine 503;

[0121] The first optical switching engine 503 is further configured to couple the at least one second optical signal into the at least one first output port (eg, Figure 8 The first output ports DM1 and DM3 are shown).

[0122] In some embodiments, the angle of the second multi-wavelength optical signal after the second angle deflection is the first signal angle, and the first signal angle is determined based on the focal length of the first lens 5042 and the multiple second positions 52, and the multiple second positions 502 are constrained by the at least one first output port.

[0123] In some embodiments, the dispersion module 504 may also include other lenses, for example, Figure 7 , may also include a second lens and / or a third lens, the second lens is located between the first optical switching engine 503 and the dispersion grating 5041, and the third lens is located between the first lens and the second optical switching engine 505.

[0124] For the optical signal (the first multi-wavelength optical signal or the second multi-wavelength optical signal) transmitted from the first optical switching engine 503 to the dispersion grating 5041, the optical signal will be transmitted to the dispersion grating 5041 through the second lens. For the optical signal (the first single-wavelength optical signal or the second single-wavelength optical signal) transmitted from the first lens 5042 to the second optical switching engine 505, the optical signal will be transmitted to the second optical switching engine 505 through the third lens. Similarly, for the optical signal (the first single-wavelength optical signal or the second single-wavelength optical signal) reflected from the second optical switching engine 505 back to the first lens 5042, the optical signal will be reflected back to the first lens 5042 through the second lens. For the optical signal (the first optical signal or the second optical signal) transmitted from the dispersion grating 5041 to the first optical switching engine 503, the optical signal will be transmitted to the first optical switching engine 503 through the second lens.

[0125] See also Fig. 9 or Fig.10 The dispersion module 504 is a reflective dispersion module, which includes a reflective dispersion grating 5041 and a curved mirror 5043. The beam deflection component 502, the first optical switching engine 503, the second optical switching engine 505 and the dispersion grating 5041 are located on the same side of the curved mirror 5043, and the first optical switching engine 503 has the function of reflecting optical signals.

[0126] In the case where the wavelength selective switch 500 is powered off, see Fig. 9 (a), a beam deflection component 502, used to deflect a first multi-wavelength optical signal input from a first input port COM1 by a first angle and then transmit it to a first optical switching engine 503;

[0127] The first optical switching engine 503 is used to reflect the first multi-wavelength optical signal after being deflected at a first angle to the curved mirror 5043;

[0128] The curved mirror 5043 is used to reflect the first multi-wavelength optical signal transmitted by the first optical switching engine 503 to the dispersion grating 5041;

[0129] The dispersion grating 5041 is used to decompose the first multi-wavelength optical signal reflected by the curved mirror 5043 into a plurality of first single-wavelength optical signals, and reflect the plurality of first single-wavelength optical signals to the curved mirror 5043;

[0130] The curved mirror 5043 is further used to reflect the multiple first single-wavelength optical signals to the multiple first positions 51 of the second optical switching engine 505 .

[0131] See also Fig. 9 (b) the plurality of first single-wavelength optical signals are reflected to the curved mirror 5043 at the plurality of first positions 51 of the second optical switching engine 505, and the curved mirror 5043 is further used to reflect the plurality of first single-wavelength optical signals reflected by the plurality of first positions 51 to the dispersion grating 5041;

[0132] The dispersion grating 5041 is further used to combine the multiple first single-wavelength optical signals reflected by the curved mirror 5043 into a first optical signal, and transmit the first optical signal to the curved mirror 5043;

[0133] The curved mirror 5043 is also used to reflect the first optical signal transmitted through the dispersion grating 5041 back to the first optical switching engine 503;

[0134] The first optical switching engine 503 is further configured to reflect the first optical signal to a direction other than the port included in the wavelength selective switch 500 .

[0135] When the wavelength selective switch 500 is powered on, see Fig.10 (a), the beam deflection component 502 is also used to deflect the second multi-wavelength optical signal input from the first input port COM1 by a first angle and then transmit it to the first optical switching engine 503;

[0136] The first optical switching engine 503 is further configured to deflect the second multi-wavelength optical signal deflected by the first angle to a second angle, and then reflect the second multi-wavelength optical signal deflected by the second angle to the curved mirror 5043;

[0137] The curved mirror 5043 is also used to reflect the second multi-wavelength optical signal transmitted by the first optical switching engine 503 to the dispersion grating 5041;

[0138] The dispersion grating 5041 is further used to decompose the second multi-wavelength optical signal reflected by the curved mirror 5043 into a plurality of second single-wavelength optical signals, and reflect the plurality of second single-wavelength optical signals to the curved mirror 5043;

[0139] The curved mirror 5043 is further used to reflect the plurality of second single-wavelength optical signals reflected by the dispersion grating 5041 to the plurality of second positions 52 of the second optical switching engine 505;

[0140] See also Fig.10 (b) the plurality of second single-wavelength optical signals are reflected back to the curved mirror 5043 at the plurality of second positions 52 of the second optical switching engine 505;

[0141] The curved mirror 5043 is further used to reflect the plurality of second single-wavelength optical signals reflected by the plurality of second positions 52 to the dispersion grating 5041;

[0142] The dispersion grating 5041 is further used to combine the multiple second single-wavelength optical signals reflected by the curved mirror 5043 into at least one second optical signal, and transmit the at least one second optical signal to the curved mirror 5043;

[0143] The curved mirror 5043 is further used to reflect the at least one second optical signal toward the first optical switching engine 502;

[0144] The first optical switching engine 502 is further configured to reflect the at least one second optical signal reflected by the curved mirror 5043 to at least one first output port (eg Fig.10 The first output ports DM1 and DM3 in the embodiment.

[0145] In some embodiments, see Fig. 9 , the dispersion module 504 may further include a switching lens, which is located between the dispersion grating 5041 and the curved mirror 5043. For the optical signal (the first multi-wavelength optical signal or the second multi-wavelength optical signal) transmitted from the curved mirror 5043 to the dispersion grating 5041, the optical signal is transmitted to the dispersion grating 5041 through the switching lens. For the optical signal (the first single-wavelength optical signal, the second single-wavelength optical signal, the first optical signal or the second optical signal) transmitted from the dispersion grating 5041 to the curved mirror 5043, the optical signal is transmitted to the curved mirror 5043 through the switching lens.

[0146] In some embodiments, see Fig.11 or Fig.12 For each input port in the port group 501, the beam deflection component 502 includes a lens unit corresponding to each input port.

[0147] For example, for the first input port COM1, the beam deflection assembly 502 includes a first lens unit 5021 corresponding to the first input port COM1, there is a first offset between the optical axis of the first input port COM1 and the optical axis of the first lens unit 5021, and the first angle is constrained by the first offset and the curvature of the first lens unit 5021.

[0148] See also Fig.11When the wavelength selective switch 500 is powered off, the first lens unit 5021 deflects the first multi-wavelength optical signal input from the first input port COM1 by the first angle and transmits it to the first optical switching engine 503. When the wavelength selective switch 500 is powered on, the first lens unit 5021 deflects the second multi-wavelength optical signal input from the first input port COM1 by the first angle and transmits it to the first optical switching engine 503.

[0149] For another example, for the second input port COM2 included in the port group 501, the beam deflection assembly 502 includes a second lens unit 5022 corresponding to the second input port COM2, there is a second offset between the optical axis of the second input port COM2 and the optical axis of the second lens unit 5022, and the third angle is constrained by the second offset and the curvature of the second lens unit 5022.

[0150] See also Fig.11 When the wavelength selective switch 500 is powered off, the second lens unit 5022 deflects the third multi-wavelength optical signal input from the second input port COM2 by a third angle and transmits it to the first optical switching engine 503. When the wavelength selective switch 500 is powered on, the second lens unit 5022 deflects the fourth multi-wavelength optical signal input from the second input port COM2 by a third angle and transmits it to the first optical switching engine 503.

[0151] In some embodiments, see Fig.12 For each input port in the port group 501, the beam deflection component 5021 includes a prism corresponding to each input port.

[0152] For example, for the first input port COM1, the beam deflection component 502 includes a first prism 5023 corresponding to the first input port COM1, and the deflection angle of the incident beam by the first prism 5023 is equal to the first angle.

[0153] See also Fig.12 When the wavelength selective switch 500 is powered off, the first prism 5023 deflects the first multi-wavelength optical signal input from the first input port COM1 by the first angle and transmits it to the first optical switching engine 503. When the wavelength selective switch 500 is powered on, the first prism 5024 deflects the second multi-wavelength optical signal input from the first input port COM1 by the first angle and transmits it to the first optical switching engine 503.

[0154] For another example, for the second input port COM2 included in the port group 501, the beam deflection component 502 includes a second prism 5024 corresponding to the second input port COM2, and the deflection angle of the incident light beam by the second prism 5024 is equal to the third angle.

[0155] See also Fig.12 When the wavelength selective switch 500 is powered off, the second prism 5024 deflects the third multi-wavelength optical signal input from the second input port COM2 by a third angle and transmits it to the first optical switching engine 503. When the wavelength selective switch 500 is powered on, the second prism 5024 deflects the fourth multi-wavelength optical signal input from the second input port COM2 by a third angle and transmits it to the first optical switching engine 503.

[0156] In some embodiments, see Fig.13 The beam deflection assembly 502 and the first optical switching engine 503 can be integrated into a module, which is an optical deflection module. For each input port in the port group 501, the optical deflection module includes a reflector unit corresponding to each input port.

[0157] For example, Fig.13 For the first input port COM1, the light deflection module includes a first reflector unit 5025 corresponding to the first input port COM1, the first reflector unit 5025 is a curved structure, there is a third offset between the optical axis of the first input port COM1 and the first reflector unit 5025, and the first angle is constrained by the third offset and the curvature of the first reflector unit 5023.

[0158] See also Fig.13 When the wavelength selective switch 500 is powered off, the first mirror unit 5023 deflects the first multi-wavelength optical signal input from the first input port COM1 by a first angle and then reflects it back to the first optical switching engine 503. When the wavelength selective switch 500 is powered on, the first reflector unit 5025 deflects the second multi-wavelength optical signal input from the first input port COM1 by a first angle, and the optical deflection module deflects the first multi-wavelength optical signal deflected by the first angle by a second angle, and reflects the second multi-wavelength optical signal deflected by the second angle back to the first optical switching engine 503.

[0159] For another example, for the second input port COM2 included in the port group 501, the light deflection module includes a second reflector unit 5026 corresponding to the second input port COM2, the second reflector unit 5026 is a curved structure, there is a fourth offset between the optical axis of the second input port COM2 and the optical axis of the second reflector unit 5026, and the third angle is constrained by the fourth offset and the curvature of the second reflector unit 5026.

[0160] See also Fig.13When the wavelength selective switch 500 is powered off, the second reflector unit 5026 deflects the third multi-wavelength optical signal input from the second input port COM2 by a third angle and then reflects it to the first optical switching engine 503. When the wavelength selective switch 500 is powered on, the second reflector unit 5026 deflects the fourth multi-wavelength optical signal input from the second input port COM2 by a third angle and then transmits it. The optical deflection module deflects the fourth multi-wavelength optical signal deflected by the third angle by a fourth angle and reflects the fourth multi-wavelength optical signal deflected by the fourth angle back to the first optical switching engine 503.

[0161] In some embodiments, the first angle and the third angle are both greater than 0 degrees and less than 10 degrees. For example, the first angle is 5 degrees and the third angle is 4 degrees; or the first angle is 3 degrees and the third angle is 2 degrees, etc.

[0162] In the embodiment of the present application, since the beam deflection assembly can also deflect the first multi-wavelength optical signal input from the first input port by the first angle when the wavelength selective switch is powered off, the first multi-wavelength optical signal after deflection by the first angle will not be parallel to the optical axis of the first input port. In this way, after the dispersion module decomposes the first multi-wavelength optical signal after deflection by the first angle into a plurality of first single-wavelength optical signals, the plurality of first single-wavelength optical signals can be transmitted to a plurality of first positions of the second optical switching engine. After the plurality of first single-wavelength optical signals are reflected back to the dispersion module from the plurality of first positions, the dispersion module transmits the first optical signal to the beam deflection assembly through the first optical switching engine. The beam deflection assembly transmits the first optical signal to a direction other than the port included in the wavelength selective switch, thereby preventing the first optical signal from generating crosstalk with a signal on any port in the wavelength selective switch, that is, avoiding signal crosstalk. However, in the case where the wavelength selective switch is powered off, since the beam deflection assembly deflects the second multi-wavelength optical signal input from the first input port by the first angle, the first optical switching engine deflects the second multi-wavelength optical signal after deflection by the first angle by a second angle. In this way, after the dispersion module decomposes the first multi-wavelength optical signal after being deflected by the second angle into multiple second single-wavelength optical signals, the multiple second single-wavelength optical signals can be successfully transmitted to multiple second positions of the second optical switching engine. After the multiple second single-wavelength optical signals are reflected back to the dispersion module from the multiple second positions, the dispersion module transmits at least one second optical signal to the first optical switching engine, and the first optical switching engine couples the at least one second optical signal into at least one first output port. In this way, it is ensured that the optical signal input from the first input port can be successfully output from at least one first output port. In addition, since the beam deflection component deflects the second multi-wavelength optical signal by the first angle, the angle at which the first optical switching engine needs to deflect the second multi-wavelength optical signal can be reduced, and the power consumption of the first optical switching engine can be reduced.

[0163] See also Fig.14The embodiment of the present application provides a method 600 for transmitting an optical signal, the method 600 is applied to a wavelength selective switch, the wavelength selective switch includes a first input port, a beam deflection component, a first optical switching engine, a dispersion module, and a second optical switching engine. Optionally, the wavelength selective switch can be the wavelength selective switch 500 provided in any of the above embodiments. The method 600 includes the following process:

[0164] Step 601: A first input port transmits a first multi-wavelength optical signal to a beam deflection component.

[0165] Step 602: The beam deflection component deflects the first multi-wavelength optical signal by a first angle and transmits the deflected signal to the first optical switching engine.

[0166] Step 603: The first optical switching engine transmits the first multi-wavelength optical signal deflected at a first angle to the dispersion module.

[0167] Step 604: The dispersion module decomposes the first multi-wavelength optical signal transmitted through the first optical switching engine into multiple first single-wavelength optical signals, transmits the multiple first single-wavelength optical signals to multiple first positions of the second optical switching engine, and the multiple first single-wavelength optical signals are reflected back to the dispersion module at the multiple first positions.

[0168] Step 605: The dispersion module combines the reflected multiple first single-wavelength optical signals into a first optical signal, and transmits the first optical signal to the first optical switching engine.

[0169] Step 606: The first optical switching engine transmits a first optical signal to the optical beam deflection component.

[0170] Step 607: When the wavelength selective switch is powered off, the beam deflection component transmits the first optical signal transmitted through the first optical switching engine to a direction other than the port included in the wavelength selective switch.

[0171] In some embodiments, the wavelength selective switch further includes at least one first output port corresponding to the first input port. When the wavelength selective switch is powered on, the method 600 further includes the following process:

[0172] (1): The first input port transmits a second multi-wavelength optical signal to the beam deflection component.

[0173] (2): The beam deflection component deflects the second multi-wavelength optical signal at a first angle and transmits the deflected signal to the first optical switching engine.

[0174] (3): The first optical switching engine deflects the second multi-wavelength optical signal deflected by the first angle by a second angle and transmits the deflected signal to the dispersion module.

[0175] (4): The dispersion module decomposes the second multi-wavelength optical signal transmitted by the first optical switching engine into multiple second single-wavelength optical signals, transmits the multiple second single-wavelength optical signals to multiple second positions of the second optical switching engine, and the multiple second single-wavelength optical signals are reflected back to the dispersion module at the multiple second positions.

[0176] (5): The dispersion module combines the reflected multiple second single-wavelength optical signals into at least one second optical signal, and transmits the at least one second optical signal to the first optical switching engine.

[0177] (6): When the wavelength selective switch is powered on, the first optical switching engine couples at least one second optical signal into at least one first output port.

[0178] Optionally, each second optical signal includes part or all of a plurality of second single-wavelength optical signals.

[0179] In the embodiment of the present application, since the beam deflection assembly can also deflect the first multi-wavelength optical signal input from the first input port by the first angle when the wavelength selective switch is powered off, the first multi-wavelength optical signal after being deflected by the first angle will not be parallel to the optical axis of the first input port. In this way, after the dispersion module decomposes the first multi-wavelength optical signal after being deflected by the first angle into a plurality of first single-wavelength optical signals, the plurality of first single-wavelength optical signals can be transmitted to a plurality of first positions of the second optical switching engine. After the plurality of first single-wavelength optical signals are reflected back to the dispersion module from the plurality of first positions, the dispersion module transmits the first optical signal to the beam deflection assembly through the first optical switching engine. The beam deflection assembly transmits the first optical signal to a direction other than the port included in the wavelength selective switch, thereby preventing the first optical signal from generating crosstalk with a signal on any port in the wavelength selective switch, i.e., avoiding signal crosstalk.

[0180] A person skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware or by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk or an optical disk, etc.

[0181] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A wavelength selective switch, characterized in that: The wavelength selective switch comprises: a first input port, a beam deflection component, a first optical switching engine, a dispersion module, and a second optical switching engine; The first input port is used to transmit a first multi-wavelength optical signal to the beam deflection assembly; The beam deflection component is used to deflect the first multi-wavelength optical signal by a first angle and then transmit it to the first optical switching engine; The first optical switching engine is used to transmit the first multi-wavelength optical signal deflected by a first angle to the dispersion module; The dispersion module is used to decompose the first multi-wavelength optical signal transmitted through the first optical switching engine into a plurality of first single-wavelength optical signals, transmit the plurality of first single-wavelength optical signals to a plurality of first positions of the second optical switching engine, and reflect the plurality of first single-wavelength optical signals back to the dispersion module at the plurality of first positions; The dispersion module is further used to combine the reflected multiple first single-wavelength optical signals into a first optical signal, and transmit the first optical signal to the first optical switching engine; The first optical switching engine is further used to transmit the first optical signal to the beam deflection component; When the wavelength selective switch is powered off, the light beam deflection assembly is further used to transmit the first optical signal transmitted through the first optical switching engine to a direction other than the port included in the wavelength selective switch.

2. The wavelength selective switch according to claim 1, characterized in that: The wavelength selective switch further comprises at least one first output port corresponding to the first input port; The first input port is further used to transmit a second multi-wavelength optical signal to the beam deflection assembly; The beam deflection component is further used to deflect the second multi-wavelength optical signal by a first angle and then transmit it to the first optical switching engine; The first optical switching engine is further used to deflect the second multi-wavelength optical signal after being deflected by the first angle by a second angle and transmit it to the dispersion module; The dispersion module is further used to decompose the second multi-wavelength optical signal transmitted through the first optical switching engine into a plurality of second single-wavelength optical signals, transmit the plurality of second single-wavelength optical signals to a plurality of second positions of the second optical switching engine, and reflect the plurality of second single-wavelength optical signals back to the dispersion module at the plurality of second positions; The dispersion module is further used to combine the reflected multiple second single-wavelength optical signals into at least one second optical signal, and transmit the at least one second optical signal to the first optical switching engine; When the wavelength selective switch is powered on, the first optical switching engine is further configured to couple the at least one second optical signal into the at least one first output port.

3. The wavelength selective switch according to claim 2, characterized in that: The angle of the second multi-wavelength optical signal transmitted to the dispersion module is equal to a third angle, and the third angle is an angle at which the beam deflection component and the first optical switching engine jointly deflect the second multi-wavelength optical signal.

4. The wavelength selective switch according to any one of claims 1 to 3, characterized in that: The wavelength selective switch further comprises a second input port, wherein the second input port is symmetrical with the first input port relative to the optical axis of the wavelength selective switch; The dispersion reflection module is used to transmit the first optical signal to a position on the optical beam deflection component corresponding to the second input port, and the first optical signal is transmitted in a direction outside the second input port.

5. The wavelength selective switch according to any one of claims 1 to 4, characterized in that: The beam deflection assembly comprises a lens unit corresponding to the first input port, there is an offset between an optical axis of the first input port and an optical axis of the lens unit, and the first angle is constrained by the offset and a curvature of the lens unit.

6. The wavelength selective switch according to any one of claims 1 to 4, characterized in that: The beam deflection component includes a prism corresponding to the first input port, and the deflection angle of the incident beam by the prism is equal to the first angle.

7. The wavelength selective switch according to any one of claims 1 to 4, characterized in that: The beam deflection component and the first optical switching engine are integrated into a module, and the module includes a reflector unit corresponding to the first input port, the reflector unit is a curved structure, there is an offset between the optical axis of the first input port and the optical axis of the reflector unit, and the first angle is constrained by the offset and the curvature of the reflector unit.

8. The wavelength selective switch according to any one of claims 1 to 7, characterized in that: The first angle is greater than 0 degrees and less than 10 degrees.

9. A method for transmitting an optical signal, characterized in that: The method is applied to a wavelength selective switch, the wavelength selective switch comprising a first input port, a beam deflection component, a first optical switching engine, a dispersion module and a second optical switching engine, including: The first input port transmits a first multi-wavelength optical signal to the beam deflection assembly; The beam deflection component deflects the first multi-wavelength optical signal by a first angle and transmits the deflected signal to the first optical switching engine; The first optical switching engine transmits the first multi-wavelength optical signal deflected by a first angle to the dispersion module; The dispersion module decomposes the first multi-wavelength optical signal transmitted through the first optical switching engine into a plurality of first single-wavelength optical signals, transmits the plurality of first single-wavelength optical signals to a plurality of first positions of the second optical switching engine, and the plurality of first single-wavelength optical signals are reflected back to the dispersion module at the plurality of first positions; The dispersion module combines the reflected multiple first single-wavelength optical signals into a first optical signal, and transmits the first optical signal to the first optical switching engine; The first optical switching engine transmits the first optical signal to the beam deflection assembly; When the wavelength selective switch is powered off, the beam deflection assembly transmits the first optical signal transmitted through the first optical switching engine to a direction other than the port included in the wavelength selective switch.

10. The method according to claim 9, characterized in that The wavelength selective switch further comprises at least one first output port corresponding to the first input port, the method further comprising: The first input port transmits a second multi-wavelength optical signal to the beam deflection assembly; The beam deflection component deflects the second multi-wavelength optical signal by a first angle and transmits the deflected signal to the first optical switching engine; The first optical switching engine deflects the second multi-wavelength optical signal after being deflected by the first angle by a second angle and transmits the deflected signal to the dispersion module; The dispersion module decomposes the second multi-wavelength optical signal transmitted through the first optical switching engine into a plurality of second single-wavelength optical signals, transmits the plurality of second single-wavelength optical signals to a plurality of second positions of the second optical switching engine, and the plurality of second single-wavelength optical signals are reflected back to the dispersion module at the plurality of second positions; The dispersion module combines the reflected multiple second single-wavelength optical signals into at least one second optical signal, and transmits the at least one second optical signal to the first optical switching engine; When the wavelength selective switch is powered on, the first optical switching engine couples the at least one second optical signal into the at least one first output port.

11. A single board, characterized in that: include: At least one wavelength selective switch according to any one of claims 1 to 8.

12. An optical switching device, characterized in that: It comprises a plurality of single boards, at least one of the plurality of single boards being the single board according to claim 11.

13. The optical switching device according to claim 12, characterized in that: The optical switching device is a reconfigurable optical fork multiplexer.

14. An optical network system, characterized in that: include: A plurality of optical switching devices, at least one of the plurality of optical switching devices is the optical switching device according to claim 12 or 13.

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