Wavelength selective switch, optical switching device and optical network system

Abstract

The embodiment of the invention provides a wavelength selection switch, optical switching equipment and an optical network system, relates to the technical field of optical communication, and can increase the number of ports of the wavelength selection switch. In the wavelength selection switch, a wave combining and separating device receives a first optical signal from a first port and outputs m optical signals, and m is a positive integer greater than or equal to 1; the second direction deflection device emits the optical signal of the first wave band in the m optical signals to the optical modulator at a first angle, and the first angle is an included angle between the direction in which the optical signal of the first wave band is emitted from the second direction deflection device and the first direction in the port plane of the wavelength selection switch; the optical modulator modulates the optical signal of the first wave band to generate a modulated optical signal of the first wave band.

Description

Technical Field

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

[0002] Optical network systems are continuously evolving towards large capacity, low latency, and intelligence. In optical network systems, optical switching equipment is usually provided, wherein the optical switching equipment can realize the scheduling of optical signals of different wavelengths in any direction, as well as the adding or dropping of optical signals of different wavelengths. Currently, commonly used optical switching equipment includes optical cross-connect (OXC) and optical add-drop multiplexer (OADM).

[0003] Among them, the core component of the optical switching equipment is the wavelength selective switch (WSS), which is used to receive a combined optical signal formed by combining multiple optical signals of different wavelengths, and transmit an optical signal of a predetermined wavelength in the combined optical signal to a predetermined port.

[0004] As the traffic volume in the optical network system increases, the scheduling capacity of the optical switching equipment installed in the optical network system also needs to be increased. Among them, the scheduling capacity of the optical switching equipment is positively correlated with the number of ports of the wavelength selective switch. When the number of ports of the wavelength selective switch increases, the scheduling capacity of the optical switching equipment will also increase. However, due to the size of the optical modulator in the wavelength selective switch, the number of ports of the existing wavelength selective switch is limited. Summary of the invention

[0005] The embodiments of the present application provide a wavelength selective switch, an optical switching device, and an optical network system, which can increase the number of ports of the wavelength selective switch.

[0006] In a first aspect, a wavelength selective switch is provided, comprising: a wavelength combiner / demultiplexer, a second direction deflection device and an optical modulator; the wavelength combiner / demultiplexer is used to receive a first optical signal inputted from a first port of the wavelength selective switch, output m optical signals, and transmit the m optical signals to the second direction deflection device, where m is a positive integer greater than or equal to 1; the second direction deflection device is used to emit an optical signal of a first wavelength band among the m optical signals to the optical modulator at a first angle, where the first angle is the angle between the direction in which the optical signal of the first wavelength band is emitted from the second direction deflection device and the first direction in a plane where the first direction and the second direction are located, wherein In the embodiment, the absolute value of the first angle is greater than 0 degrees and less than 90 degrees, that is, after the optical signal enters the second direction deflection device, the exit angle must be non-parallel to the first direction, or the absolute value of the first angle is greater than or equal to 0 degrees and less than 90 degrees, that is, the second direction deflection device can deflect the optical signal of the first band in the second direction, and the degree of deflection can be 0 degrees or any degree between 0 degrees and 90 degrees; the first direction is the optical transmission direction of the wavelength selective switch, and the second direction is the port direction of the wavelength selective switch; the optical modulator is used to modulate the optical signal of the first band to generate a modulated optical signal of the first band. In the wavelength selective switch, since the second direction deflection device is provided, the second direction deflection device is used to emit the optical signal of the first band among the m optical signals to the optical modulator at a first angle, and the first angle is the angle between the direction of the optical signal of the first band emitted from the second direction deflection device and the first direction in the plane where the first direction and the second direction are located. Such a wavelength selective switch can transmit the optical signal of the first wavelength band to any position of the optical modulator in the second direction through the second direction deflection device, thereby improving the flexibility of the wavelength selective switch and providing the possibility of increasing the number of ports of the wavelength selective switch. Therefore, the number of ports of the wavelength selective switch designed based on the above principle will increase.

[0007] Optionally, the wavelength selective switch further includes a third directional deflection device disposed between the second directional deflection device and the optical modulator along the first direction; the third directional deflection device is used to emit the optical signal of the first wavelength band to the optical modulator at different second angles, the second angle being the angle between the direction in which the optical signal of the first wavelength band is emitted from the third directional deflection device and the first direction in the plane where the first direction and the third direction are located, the third direction being the dispersion direction of the wavelength selective switch, wherein the absolute value of the second angle is greater than or equal to 0 degrees and less than 90 degrees. In this optional manner, due to the provision of the third directional deflection device, the third directional deflection device emits the optical signal of the first wavelength band to the optical modulator at different second angles, the second angle being the angle between the direction in which the optical signal of the first wavelength band is emitted from the third directional deflection device and the first direction in the plane where the first direction and the third direction are located. Such a wavelength selective switch can transmit the optical signal of the first band to any position of the optical modulator in the third direction through a third-direction deflection device, that is, the optical signal of the first band can be transmitted to the same position of the optical modulator in the second direction, and to different positions of the optical modulator in the third direction, further improving the flexibility of the wavelength selective switch.

[0008] Optionally, the second directional deflection device is also used to transmit the optical signal of the second band among the m optical signals to the third directional deflection device at a third angle, the third angle being the angle between the direction in which the optical signal of the second band is emitted from the second directional deflection device and the first direction in the plane where the first direction and the second direction are located, wherein the absolute value of the third angle is greater than or equal to 0 degrees and less than 90 degrees, the first angle is different from the third angle, and m is a positive integer greater than or equal to 2; the third directional deflection device is used to transmit the optical signal of the second band to the optical modulator at a different fourth angle, the fourth angle being the angle between the direction in which the optical signal of the second band is emitted from the third directional deflection device and the first direction in the plane where the first direction and the third direction are located, wherein the absolute value of the fourth angle is greater than or equal to 0 degrees and less than 90 degrees; the optical modulator is used to modulate the optical signal of the second band to generate a modulated optical signal of the second band. In this optional mode, the second direction deflection device is used to emit the optical signal of the second wavelength band among the m optical signals to the third direction deflection device at a third angle, and the third angle is the angle between the direction of the optical signal of the second wavelength band emitted from the second direction deflection device and the first direction in the plane where the first direction and the second direction are located; the third direction deflection device is used to emit the optical signal of the second wavelength band to the optical modulator at a fourth angle, and the fourth angle is the angle between the direction of the optical signal of the second wavelength band emitted from the third direction deflection device and the first direction in the plane where the first direction and the third direction are located. Such a wavelength selective switch can transmit the optical signal of the second wavelength band to any position in the second direction of the optical modulator and any position in the third direction of the optical modulator through the second direction deflection device and the third direction deflection device. In addition, since the first angle is different from the third angle, the optical signal of the first wavelength band and the optical signal of the second wavelength band will be transmitted to different positions in the second direction of the optical modulator, so that the optical modulator can modulate the optical signal of the first wavelength band and the optical signal of the second wavelength band respectively. By adjusting the value of the second angle, when the optical signal of the first band is transmitted to the optical modulator, the light spot of the optical signal of the first band can be close to the center of the optical modulator along the third direction. By adjusting the value of the fourth angle, when the optical signal of the second band is transmitted to the optical modulator, the light spot of the optical signal of the second band can be close to the center of the optical modulator along the third direction. Therefore, in the wavelength selective switch, the optical signal of the first band and the optical signal of the second band will be transmitted to different positions of the optical modulator in the second direction, and the optical signal of the first band and the optical signal of the second band can both be close to the center of the optical modulator along the third direction, so that the optical modulator can modulate the optical signal of the first band and the optical signal of the second band respectively, which can increase the number of ports of the wavelength selective switch.

[0009] Optionally, the second direction deflection device includes a first deflection device and a second deflection device, and the first deflection device and the second deflection device are arranged along a third direction; the first deflection device is used to transmit the optical signal of the first wavelength band to the third direction deflection device at a first angle; the second deflection device is used to transmit the optical signal of the second wavelength band to the third direction deflection device at a third angle. In this optional manner, the second direction deflection device includes a first deflection device and a second deflection device, and the first deflection device acts on the optical signal of the first wavelength band, and the second deflection device acts on the optical signal of the second wavelength band.

[0010] Optionally, the third directional deflection device includes a third deflection device and a fourth deflection device, and the third deflection device and the fourth deflection device are arranged along the second direction; the third deflection device is used to transmit the optical signal of the first wavelength band to the optical modulator at a different second angle; the fourth deflection device is used to transmit the optical signal of the second wavelength band to the optical modulator at a different fourth angle. In this optional manner, the third directional deflection device includes a third deflection device and a fourth deflection device, and the third deflection device acts on the optical signal of the first wavelength band, and the fourth deflection device acts on the optical signal of the second wavelength band.

[0011] Optionally, the second direction deflection device further includes a fifth deflection device disposed between the first deflection device and the second deflection device along the third direction; the fifth deflection device is used to transmit the received optical signal to the third direction deflection device at the first angle or the third angle. In this optional manner, the fifth deflection device transmits the received optical signal to the third direction deflection device at the first angle, and when the frequency range covered by the first deflection device is equal to the frequency range covered by the second deflection device, the frequency range of the first band is equal to the sum of the frequency range covered by the first deflection device and the frequency range covered by the fifth deflection device, thereby making the frequency range of the first band greater than the frequency range of the second band, and the wavelength selective switch divides the m optical signals into the first band and the second band in a ratio of x:1, where x is greater than 1. The fifth deflection device transmits the received optical signal to the third directional deflection device at a third angle. When the frequency range covered by the first deflection device is equal to the frequency range covered by the second deflection device, the frequency range of the second band is equal to the sum of the frequency range covered by the fifth deflection device and the frequency range covered by the second deflection device, thereby making the frequency range of the second band greater than the frequency range of the first band. The wavelength selection switch divides the m optical signals into the first band and the second band in a ratio of 1:x, where x is greater than 1.

[0012] Optionally, the third directional deflection device is also used to transmit the modulated optical signal of the first band to the second directional deflection device; the second directional deflection device is also used to transmit the modulated optical signal of the first band to the wavelength combiner / splitter; the wavelength combiner / splitter is used to transmit the modulated optical signal of the first band to at least one second port of the wavelength selection switch.

[0013] Optionally, the third direction deflection device is further used to emit the modulated optical signal of the first band to the second direction deflection device at a different seventh angle, and the seventh angle is the angle between the emission direction of the modulated optical signal of the first band from the third direction deflection device and the first direction in the plane where the first direction and the third direction are located; the second direction deflection device is used to emit the modulated optical signal of the first band to the wavelength combiner / demultiplexer at an eighth angle, and the eighth angle is the angle between the emission direction of the modulated optical signal of the first band from the second direction deflection device and the first direction in the plane where the first direction and the second direction are located; the wavelength combiner / demultiplexer is used to transmit the modulated optical signal of the first band to at least one second port of the wavelength selection switch.

[0014] Optionally, the wavelength selective switch further includes a first lens, which is disposed between the second direction deflection device and the third direction deflection device; the first lens is used to collimate the m optical signals in the second direction and focus the m optical signals in the third direction. In this optional manner, the first lens collimates the m optical signals in the second direction, thereby preventing the m optical signals from infinitely extending in the second direction, so that the size of the third direction deflection device in the second direction does not need to be too large to receive the m optical signals, and the first lens focuses the m optical signals in the third direction, so that the size of the third direction deflection device in the third direction does not need to be too large to receive the m optical signals.

[0015] Optionally, the wavelength selective switch further includes a second lens, which is disposed between the third-direction deflection device and the optical modulator; the second lens is used to collimate the m optical signals in the third direction. In this optional manner, the second lens collimates the m optical signals in the third direction to avoid infinite extension of the m optical signals in the third direction, so that the size of the optical modulator in the third direction does not need to be too large to receive the m optical signals.

[0016] Optionally, the wavelength selective switch further includes a third lens and a fourth lens, and along the first direction, the third lens and the fourth lens are arranged between the third directional deflection device and the optical modulator; the third lens is used to focus the m optical signals in the second direction; the fourth lens is used to collimate the m optical signals in the second direction. In this optional manner, the third lens focuses the m optical signals in the second direction, and the fourth lens collimates the m optical signals in the second direction. When the distance between the third directional deflection device and the optical modulator is large, the third lens and the fourth lens can suppress the scattering of the m optical signals in the second direction.

[0017] Optionally, the wavelength selective switch further includes a fifth lens, which is disposed between the wavelength combiner and demultiplexer and the second direction deflection device; the fifth lens is used to collimate the m optical signals in the third direction. In this optional manner, the fifth lens collimates the m optical signals in the third direction to avoid infinite extension of the m optical signals in the third direction, so that the size of the second direction deflection device in the third direction does not need to be too large to receive the m optical signals.

[0018] Optionally, the second direction deflection device is disposed at the focal plane of the second lens; the third direction deflection device is disposed at the focal plane of the second lens; the third direction deflection device is also disposed at the focal plane of the third lens; the focal length of the third lens is greater than the focal length of the second lens. In an optional manner, the focal length of the third lens is greater than the focal length of the second lens, and the size of the spot of any light signal in the third direction will be magnified.

[0019] Optionally, the first port of the wavelength selective switch and the second port of the wavelength selective switch are arranged along the second direction.

[0020] Optionally, the first port of the wavelength selective switch and the second port of the wavelength selective switch are arranged in an array in a plane where the second direction and the third direction are located.

[0021] Optionally, the phase change direction of the optical modulator is parallel to the second direction.

[0022] Optionally, the phase change direction of the optical modulator has a component parallel to the second direction, and the phase change direction of the optical modulator has a component parallel to the third direction.

[0023] Optionally, the first deflection device includes any one of the following: a reflector, a micro-electromechanical system micro-mirror, a grating, and a prism; the second deflection device includes any one of the following: a reflector, a micro-electromechanical system micro-mirror, a grating, and a prism.

[0024] Optionally, the third deflection device includes any one of the following: a reflector, a micro-electro-mechanical system micro-mirror, a grating, and a prism; and the fourth deflection device includes any one of the following: a reflector, a micro-electro-mechanical system micro-mirror, a grating, and a prism.

[0025] Optionally, the fifth deflection device includes any one of the following: a reflector, a micro-electromechanical system micro-mirror, a grating, and a prism.

[0026] In a second aspect, an optical switching device is provided, comprising a wavelength selective switch as described in any one of the first aspects above.

[0027] According to a third aspect, an optical network system is provided, comprising a plurality of optical switching devices as described in any one of the second aspects above, connected by optical fibers.

[0028] Among them, the technical effects brought about by any possible implementation method of the second aspect and the third aspect can refer to the technical effects brought about by the implementation method of the first aspect mentioned above, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of an optical network system;

[0030] Figure 2 It is a structural schematic diagram of an optical add-drop multiplexer;

[0031] Figure 3 is a schematic diagram of the structure of an optical cross connection;

[0032] Figure 4 A schematic diagram of the structure of a wavelength selective switch provided in an embodiment of the present application;

[0033] Figure 5 for Figure 4 The light spot arrangement diagram of the optical signal received by the second direction deflection device in the wavelength selective switch shown;

[0034] Figure 6 A schematic diagram of the structure of a wavelength selective switch provided in another embodiment of the present application;

[0035] Figure 7 for Figure 6 The light spot arrangement diagram of the optical signal received by the optical modulator in the wavelength selective switch shown;

[0036] Figure 8 for Figure 6 A schematic structural diagram of a second direction deflection device in a wavelength selective switch shown;

[0037] Fig. 9 for Figure 6 A schematic diagram of the structure of a third directional deflection device in the wavelength selective switch shown;

[0038] Fig.10 A schematic diagram of the structure of a wavelength selective switch provided in yet another embodiment of the present application;

[0039] Fig.11 A schematic diagram of the structure of a wavelength selective switch provided in yet another embodiment of the present application;

[0040] Fig.12 A schematic diagram of the structure of a wavelength selective switch provided in another embodiment of the present application;

[0041] Fig.13 for Fig.12 The structure of the second direction deflection device in the wavelength selective switch is shown as follows Figure 1 ;

[0042] Fig.14 for Fig.12 The structure of the second direction deflection device in the wavelength selective switch is shown as follows Figure 2 ;

[0043] Fig.15 A schematic structural diagram of a second direction deflection device in a wavelength selective switch provided in yet another embodiment of the present application;

[0044] Fig.16 A schematic structural diagram of a third directional deflection device in a wavelength selective switch provided in another embodiment of the present application;

[0045] Fig.17 A schematic diagram of the structure of a wavelength selective switch provided in yet another embodiment of the present application;

[0046] Fig.18 A schematic diagram of the structure of a wavelength selective switch provided in yet another embodiment of the present application;

[0047] Fig.19 A schematic diagram of the structure of a wavelength selective switch provided in another embodiment of the present application;

[0048] Fig. 20 A schematic structural diagram of a wavelength selective switch provided in yet another embodiment of the present application. DETAILED DESCRIPTION

[0049] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments.

[0050] Unless otherwise defined, all scientific and technological terms used herein have the same meaning as those known to those of ordinary skill in the art. In the embodiments of the present application, "at least one" refers to one or more, and "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B, which may represent: A exists alone, A and B exist at the same time, and B exists alone, wherein A and B may be singular or plural. The character " / " generally indicates that the associated objects before and after are a kind of "or" relationship. "At least one of the following (individuals)" or its similar expressions refers to any combination of these items, including any combination of single items (individuals) or plural items (individuals). For example, at least one of a, b or c (individuals) may represent: a, b, c, a and b, a and c, b and c or a, b and c, wherein a, b and c may be single or multiple. In addition, in the embodiments of the present application, the words "first", "second" and the like do not limit the quantity and order.

[0051] In addition, in the embodiments of the present application, directional terms such as "upper" and "lower" are defined relative to the orientation of the components in the drawings. It should be understood that these directional terms are relative concepts. They are used for relative description and clarification, and they may change accordingly according to changes in the orientation of the components in the drawings.

[0052] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0053] In the embodiments of the present application, “parallel” or “perpendicular” does not mean absolutely parallel or absolutely perpendicular, and “parallel” or “perpendicular” means parallel or perpendicular within a certain error range.

[0054] The technical solutions in the embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0055] Optical fiber transmission uses light as carrier and optical fiber as transmission medium to transmit signals. With the development of optical fiber transmission, optical network systems based on optical fiber transmission have gradually become the mainstream communication system. Figure 1 As shown, an embodiment of the present application provides a structural schematic diagram of an optical network system 10, in which the optical network system 10 includes a network 1 and a network 2, and the network 1 includes a plurality of optical switching devices connected by optical fibers, and the optical switching devices are used to control a predetermined area (e.g. Figure 1 The predetermined area shown may be a small building or an area covered by a large building) and / or a network (e.g. Figure 1 The network 2 shown in the figure provides optical communication services, wherein the optical switching equipment includes an optical cross-connect (OXC) and an optical add-drop multiplexer (OADM). An optical cross-connect is usually used to provide optical communication services to different networks, such as Figure 1 In the example, network 2 communicates with the optical cross-connection in network 1 through the optical cross-connection in network 2, so that network 2 receives the optical signal transmitted in network 1, or transmits the optical signal generated in network 2 to network 1. Both the optical cross-connection and the optical differential multiplexer can provide optical communication services to a predetermined area, for example, Figure 1In the present invention, an optical cross-connect is used in network 1 to provide optical communication services for the area covered by a large building or a small building, an optical cross-connect is used in network 2 to provide optical communication services for the area covered by a large building, and an optical add / drop multiplexer is used in network 2 to provide optical communication services for the area covered by a small building.

[0056] Among them, local communication equipment is set in the area covered by the large building and the small building, the optical switching equipment communicates with the local communication equipment, and the local communication equipment receives the network (such as Figure 1 The optical signal transmitted in the network 1 or network 2 shown, or the optical signal generated by the local communication device is transmitted to the network through the optical switching device.

[0057] In some embodiments, reference Figure 1 As shown, the optical network system 10 also includes multiple optical amplifiers. Figure 1 As shown, an optical amplifier is provided between any two optical switching devices, and the optical amplifier is used to amplify the optical signal transmitted in the optical fiber. In other embodiments, the optical network system 10 further includes devices such as an optical performance monitor, and the optical performance monitor is used to detect the signal-to-noise ratio and power of the optical signal transmitted in a certain number of optical amplifiers and / or optical switching devices.

[0058] Figure 1 The core component of the optical switching device shown is a wavelength selective switch (WSS), which can realize the scheduling of optical signals of different wavelengths in any direction, as well as the adding or dropping of optical signals of different wavelengths. The structure of the optical cross-connect including the wavelength selective switch and the optical differential multiplexer will be described in detail below.

[0059] For example, Figure 2 A schematic diagram of the structure of an optical add / drop multiplexer provided in an embodiment of the present application is shown in FIG. Figure 2 As shown, a typical C (colorless) D (directionless) C (contentionless) optical add / drop multiplexer 20 includes a line side device 21 and a client side device 22. Figure 2As shown, the line-side device 21 in the optical add / drop multiplexer 20 can realize the transmission of an optical signal of any wavelength from one line direction to another line direction; the client-side device 22 in the optical add / drop multiplexer 20 can realize the downlink of an optical signal in any line direction to a local communication device, and uplink an optical signal generated by a local communication device to any line direction. The line-side device 21 includes a plurality of wavelength selective switches (WSS), and the plurality of WSSs are cross-connected to realize the transmission of an optical signal of any wavelength from one line direction to another line direction. Figure 2 The line side device 21 shown specifically includes three wavelength selection switches, namely WSS1, WSS2 and WSS3. WSS1, WSS2 and WSS3 are cross-connected, specifically, one port of WSS1 is connected to one port of WSS2, one port of WSS1 is connected to one port of WSS3, and one port of WSS2 is connected to one port of WSS3. Among them, Figure 2 The WSSs shown are all cross-connected via optical fibers.

[0060] In other embodiments, Figure 2 The optical add / drop multiplexer 20 shown also includes more functional devices. For example, the optical add / drop multiplexer 20 also includes an optical amplifier, which is coupled to the wavelength selective switch. The optical amplifier can amplify the optical signal transmitted to the wavelength selective switch, or amplify the optical signal output by the wavelength selective switch.

[0061] Reference Figure 2 As shown, Figure 2 Any wavelength selective switch shown includes four ports, and two ports of the wavelength selective switch are connected to the client-side device 22, and the other two ports are connected to other wavelength selective switches. Figure 2 When any wavelength selective switch shown includes 8 ports, the number of ports of the wavelength selective switch connected to the client-side device 22 and / or the number of ports connected to other WSSs will increase, thereby increasing the scheduling capability of the optical add / drop multiplexer for optical signals.

[0062] For example, Figure 3 A schematic diagram of the structure of an optical cross-connect 30 provided in an embodiment of the present application is shown in FIG. Figure 3 As shown, the optical cross-connect 30 includes an optical line device 31, an optical backplane 32, and an optical branch device 33, wherein the optical line device 31 may be one or more, and the optical branch device 33 may be one or more. Figure 3 The optical line device 31 shown is specifically two, Figure 3There are two optical branch devices 33 shown. The main components of the optical line device 31 and the optical branch device 33 are wavelength selection switches. The optical line device 31 is used to transmit an optical signal of any wavelength from one line direction to another line direction through the wavelength selection switch provided therein. The optical backplane 32 is used to interconnect the optical line device 31 with the optical branch device 33. The optical branch device 33 receives an optical signal of any line direction through the optical backplane 32. The optical branch device 33 is used to transmit an optical signal of any line direction to a local communication device through the wavelength selection switch provided therein, or transmit an optical signal generated by a local communication device to any line direction. Exemplarily, Figure 3 The optical line device 31 shown is specifically provided with WSS4 and WSS5. Figure 3 The optical branch device 33 shown in the figure is specifically provided with WSS6 and WSS7. Figure 3 The optical backplane 32 shown generally includes an optical circuit board and an optical connector. The optical connector on the side of the optical backplane 32 close to the optical line device 31 is connected to the port of WSS4 and also to the port of WSS5. The optical connector on the side of the optical backplane 32 close to the optical branch device 33 is connected to the port of WSS6 and also to the port of WSS7.

[0063] In other embodiments, Figure 3 The optical cross-connect 30 shown also includes more functional devices, for example, the optical cross-connect 30 also includes an optical amplifier and a filter. For example, in the optical line device 31, an optical amplifier and a filter may be provided, the filter is coupled to the optical amplifier, and the optical amplifier is coupled to the wavelength selective switch in the optical line device 31; the optical amplifier may amplify the optical signal transmitted to the wavelength selective switch or the optical signal output by the wavelength selective switch; the filter may filter out the interference optical signal in the optical line device 31. For another example, in the optical branch device 33, an optical amplifier may be provided, the optical amplifier is coupled to the wavelength selective switch in the optical branch device 33, and the optical amplifier may amplify the optical signal transmitted to the wavelength selective switch or the optical signal output by the wavelength selective switch.

[0064] Compared with the optical add / drop multiplexer 20, the optical cross-connect 30 has a higher integration level, and the optical line device 31 and the optical branch device 33 in the optical cross-connect 30 are interconnected through the optical backplane 32, which reduces the use of optical fibers and the transmission loss of optical signals.

[0065] Reference Figure 3As shown, when the number of ports of the wavelength selective switch in the optical line device 31 increases, the optical line device 31 can dispatch more optical signals in different line-side directions through the wavelength selective switch arranged therein, and when the number of ports of the wavelength selective switch in the optical branch device 33 increases, the optical branch device 33 can dispatch more optical signals to add or drop wavelengths through the wavelength selective switch arranged therein. It can be seen that the increase in the number of ports of the wavelength selective switch can increase the dispatching capability of the optical cross-connect 30 for optical signals.

[0066] Exemplarily, an embodiment of the present application provides a wavelength selective switch, which can increase the number of ports of the wavelength selective switch. The wavelength selective switch can be arranged at Figure 2 In the optical add / drop multiplexer 20 shown in FIG. Figure 3 The optical cross-connect 30 is shown.

[0067] Reference Figure 4 As shown, Figure 4 The structure diagram of the wavelength selection switch 40 provided in the embodiment of the present application is shown, and the wavelength selection switch 40 includes a wavelength combiner / demultiplexer 41, a second direction deflection device 42 and an optical modulator 44. Among them, Figure 4 The z-axis direction is used to represent the light transmission direction in the wavelength selective switch 40, and the wavelength multiplexing / demultiplexing device 41, the second direction deflection device 42 and the optical modulator 44 in the wavelength selective switch 40 are specifically arranged in sequence along the z-axis direction; Figure 4 The x-axis direction is used to represent the dispersion direction of the wavelength selective switch 40, and the wavelength multiplexer / demultiplexer 41 in the wavelength selective switch 40 disperses the optical signals of different wavelengths along the x-axis direction; Figure 4 In the figure, the y-axis direction is used to represent the port direction of the wavelength selective switch 40, the y-axis direction is perpendicular to the x-axis direction, and the y-axis direction is perpendicular to the z-axis direction, wherein the common port and the branch port in the wavelength selective switch 40 can be arranged along the y-axis direction, or the common port and the branch port in the wavelength selective switch 40 can be arranged in an array in a plane formed by the x-axis direction and the y-axis direction, and each column of ports is arranged along the y-axis direction. The plane formed by the y-axis direction and the z-axis direction is the port plane of the wavelength selective switch 40, Figure 4 (a) is specifically a schematic diagram of a port plane of the wavelength selective switch 40; the plane formed by the x-axis direction and the z-axis direction is the dispersion plane of the wavelength selective switch 40, Figure 4 (b) is specifically a schematic diagram of the dispersion plane of the wavelength selective switch 40.

[0068] Reference Figure 4 As shown, the wavelength multiplexer / demultiplexer 41 is used to receive the first optical signal input from the first port of the wavelength selection switch 40, output m optical signals, and transmit the m optical signals to the second direction deflection device 42, where m is a positive integer greater than or equal to 1. For example, refer to Figure 4 As shown, the first port is specifically a common port of the wavelength selective switch 40, and the common port is connected to the input optical fiber of the wavelength selective switch 40, so that the wavelength selective switch 40 receives the first optical signal transmitted from the input optical fiber to the wavelength selective switch 40 from the first port. The first optical signal may include an optical signal, for example, the first optical signal includes an optical signal S1 with a wavelength of λ1, and the wavelength combiner / demultiplexer 41 transmits the optical signal S1 to the second direction deflection device 42 at a dispersion angle α1, wherein the dispersion angle α1 is specifically the dispersion angle of the optical signal S1, and the dispersion angle of any optical signal is the angle between the direction in which the optical signal is emitted from the wavelength combiner / demultiplexer 41 and the z-axis direction in the dispersion plane of the wavelength selective switch 40. In other embodiments, the first optical signal may also include multiple optical signals, for example, the first optical signal includes m optical signals, and the m optical signals are respectively an optical signal S1 with a wavelength of λ1, an optical signal S2 with a wavelength of λ2...an optical signal S(m-1) with a wavelength of λ(m-1), and an optical signal Sm with a wavelength of λm. Refer to Figure 4 As shown, the wavelength combiner / demultiplexer 41 transmits the optical signal S1 to the second direction deflection device 42 at a dispersion angle α1; the wavelength combiner / demultiplexer 41 transmits the optical signal S2 to the second direction deflection device 42 at a dispersion angle α2; the wavelength combiner / demultiplexer 41 transmits the optical signal S(m-1) to the second direction deflection device 42 at a dispersion angle α(m-1); the wavelength combiner / demultiplexer 41 transmits the optical signal Sm to the second direction deflection device 42 at a dispersion angle αm, and the dispersion angles of any two optical signals among the m optical signals are different. The wavelength combiner / demultiplexer 41 can be a grating.

[0069] For example, refer to Figure 5 As shown, when m optical signals are transmitted to the second direction deflection device 42, the light spots of the m optical signals are arranged along the x-axis direction, and the light spots of the m optical signals are located at the same position in the y-axis direction.

[0070] The second direction deflection device 42 is used to emit the optical signal of the first wavelength band among the m optical signals to the optical modulator 44 at a first angle, and the first angle is the first direction ( Figure 4 The z-axis direction in the Figure 4 In the plane where the y-axis direction in the first wavelength band is located, the angle between the direction in which the optical signal of the first wavelength band is emitted from the second direction deflection device 42 and the first direction. The absolute value of the first angle is greater than or equal to 0 degrees and less than 90 degrees. Exemplarily, the optical signal of the first wavelength band includes the optical signal S1, and the first angle is specifically Figure 4The angle β1 shown in (a) of FIG. 1 is a wavelength selective switch 40. The second direction deflection device 42 emits the optical signal S1 to the optical modulator 44 at an angle β1. The angle β1 is the angle between the direction in which the optical signal S1 is emitted from the second direction deflection device 42 and the z-axis direction in the port plane of the wavelength selective switch 40. The absolute value of the angle β1 is greater than or equal to 0 degrees and less than 90 degrees. For example, refer to Figure 4 As shown in (a), in the port plane, with the z-axis direction as the reference, when the direction of the optical signal S1 emitted from the second direction deflection device 42 is deflected clockwise downward from the z-axis direction, the angle β1 is a positive number; when the direction of the optical signal S1 emitted from the second direction deflection device 42 is deflected counterclockwise upward from the z-axis direction, the angle β1 is a negative number. Figure 4 As shown in (a), when the optical signal S1 is transmitted to the second direction deflection device 42, the light spot of the optical signal S1 is located at the position Wy1 of the second direction deflection device 42 in the y-axis direction, and Figure 4 The angle β1 shown in (a) is specifically a negative number. When the light signal S1 is emitted to the light modulator 44 at the angle β1, the light spot of the light signal S1 is exactly located at the position Wy2 of the light modulator 44 in the y-axis direction. In other embodiments, the angle β1 is specifically 0. When the light signal S1 is emitted to the light modulator 44 at the angle β1, the light spot of the light signal S1 is exactly located at the position Wy1 of the light modulator 44 in the y-axis direction. In some other embodiments, the angle β1 is specifically a positive number. When the light signal S1 is emitted to the light modulator 44 at the angle β1, the light spot of the light signal S1 is exactly located at the position Wy3 of the light modulator 44 in the y-axis direction. In the y-axis direction of the light modulator 44, the position Wy2 and the position Wy3 are respectively located on both sides of the position Wy1. Among them, the value of the angle β1 can be determined according to the position of the light signal S1 transmitted to the second direction deflection device 42 in the y-axis direction, and the position of the light spot of the light signal S1 in the light modulator 44 in the y-axis direction.

[0071] The optical modulator 44 is used to modulate the optical signal of the first wavelength band to generate a modulated optical signal of the first wavelength band. Exemplarily, the optical modulator 44 is specifically used to change the angle between the optical signal S1 and the z-axis direction in the port plane and / or the angle between the optical signal S1 and the z-axis direction in the dispersion plane when the optical signal S1 is emitted from the optical modulator 44, thereby generating a modulated optical signal S11, wherein the optical modulator 44 does not change the wavelength of the optical signal S1, and when the wavelength of the optical signal S1 belongs to the first wavelength band, the wavelength of the modulated optical signal S11 also belongs to the first wavelength band, and the modulated optical signal of the first wavelength band includes the modulated optical signal S11.

[0072] exist Figure 4In the wavelength selective switch 40 shown, since a second direction deflection device 42 is provided, the second direction deflection device 42 is used to emit the optical signal of the first wavelength band among the m optical signals to the optical modulator 44 at a first angle, and the first angle is the angle between the direction in which the first optical signal is emitted from the second direction deflection device 42 and the first direction in the plane where the first direction and the second direction are located. Such a wavelength selective switch 40 can transmit the optical signal of the first wavelength band to any position of the optical modulator 44 in the second direction through the second direction deflection device 42, thereby improving the flexibility of the wavelength selective switch 40, and further providing the possibility of increasing the number of ports of the wavelength selective switch 40. Therefore, the number of ports of the wavelength selective switch 40 designed based on the above principle will increase.

[0073] Reference Figure 6 As shown, in Figure 4 The wavelength selective switch 40 shown is based on Figure 6 The wavelength selective switch 40 shown in the figure further includes a third directional deflection device disposed between the second directional deflection device 42 and the optical modulator 44 along the z-axis direction. After the optical signal of the first wavelength band is emitted from the second directional deflection device 42, it will first be transmitted to the third directional deflection device 43 and then to the optical modulator 44. Figure 6 (a) is specifically a port plane diagram of the wavelength selective switch 40; Figure 6 (b) is specifically a schematic diagram of the dispersion plane of the wavelength selective switch 40.

[0074] The third direction deflection device 43 is used to emit the optical signal of the first wavelength band to the optical modulator 44 at a different second angle, and the second angle is the angle between the first direction and the third direction ( Figure 6 In the plane where the optical signal of the first wavelength band is located (the x-axis direction in the middle), the angle between the direction in which the optical signal of the first wavelength band is emitted from the third direction deflection device 43 and the first direction. The absolute value of the second angle is greater than or equal to 0 degrees and less than 90 degrees. Exemplarily, when the optical signal of the first wavelength band includes the optical signal S1, the second angle of the optical signal S1 is specifically Figure 6 The angle γ1 shown in (b) of FIG. 4 is a graph showing that the third direction deflection device 43 emits the optical signal S1 to the optical modulator 44 at an angle γ1, and the angle γ1 is the angle between the direction in which the optical signal S1 is emitted from the third direction deflection device 43 and the z-axis direction in the dispersion plane of the wavelength selective switch 40 (i.e., in the plane where the first direction and the third direction are located). For example, refer to Figure 6 As shown in (b), in the dispersion plane, with the z-axis direction as the reference, when the direction of the optical signal S1 emitted from the third directional deflection device 43 is deflected clockwise downward from the z-axis direction, the angle γ1 is a positive number; when the direction of the optical signal S1 emitted from the third directional deflection device 43 is deflected counterclockwise upward from the z-axis direction, the angle γ1 is a negative number. Figure 6As shown in (b), when the optical signal S1 is transmitted to the third direction deflection device 43, the light spot of the optical signal S1 is located at the position Wx1 of the third direction deflection device 43 in the x-axis direction, and Figure 6 The angle γ1 shown in (b) is specifically a negative number. When the optical signal S1 is emitted to the optical modulator 44 at the angle γ1, the light spot of the optical signal S1 is exactly located at the position Wx2 of the optical modulator 44 in the x-axis direction. In other embodiments, the angle γ1 is specifically 0. When the optical signal S1 is emitted to the optical modulator 44 at the angle γ1, the light spot of the optical signal S1 is exactly located at the position Wx1 of the optical modulator 44 in the x-axis direction. In some other embodiments, the angle γ1 is specifically a positive number. When the optical signal S1 is emitted to the optical modulator 44 at the angle γ1, the light spot of the optical signal S1 is exactly located at the position Wx5 of the optical modulator 44 in the x-axis direction. In the x-axis direction of the optical modulator 44, the position Wx2 and the position Wx5 are respectively located on both sides of the position Wx1. Among them, the value of the angle γ1 can be determined according to the position of the optical signal S1 transmitted to the third direction deflection device 43 in the x-axis direction, and the position of the light spot of the optical signal S1 in the x-axis direction of the optical modulator 44.

[0075] For example, refer to Figure 6 As shown, the m optical signals also include an optical signal S2, wherein the wavelength of the optical signal S2 belongs to the first wavelength band, and the optical signals in the first wavelength band also include the optical signal S2.

[0076] The second direction deflection device 42 is also used to emit the optical signal S2 to the third direction deflection device 43 at an angle β1. Figure 6 As shown in (a), when the optical signal S2 is transmitted to the second direction deflection device 42, the light spot of the optical signal S2 is located at the position Wy1 of the second direction deflection device 42 in the y-axis direction, and the second direction deflection device 42 emits the optical signal S2 to the third direction deflection device 43 at an angle β1, so when the optical signal S2 is transmitted to the optical modulator 44, the light spot of the optical signal S2 is also located at the position Wy2 of the optical modulator 44 in the y-axis direction. Exemplarily, when the optical signal of the first wavelength band includes multiple optical signals, when the optical signal of the first wavelength band is transmitted to the second direction deflection device 42, the light spot of the optical signal of the first wavelength band is located at the same position of the second direction deflection device 42 in the y-axis direction, and the second direction deflection device 42 emits the optical signal of the first wavelength band to the third direction deflection device 43 at an angle β1, and then transmits it to the optical modulator 44, so that the light spot of the optical signal of the first wavelength band is located at the same position of the optical modulator 44 in the y-axis direction.

[0077] The third direction deflection device 43 is also used to emit the optical signal S2 to the optical modulator 44 at an angle γ2. The second angle of the optical signal S2 is specifically angle γ2, and angle γ1 is different from angle γ2. The absolute values ​​of angle γ1 and angle γ2 may be equal, but angle γ1 and angle γ2 are opposite to each other; or, the signs of angle γ1 and angle γ2 may be the same (both are positive or both are negative), but the absolute values ​​are not equal; or, angle γ1 may be positive or negative, and angle γ2 may be 0; or, angle γ2 may be 0, and angle γ1 may be positive or negative. For example, refer to Figure 6 As shown in (b), when the optical signal S2 is transmitted to the third directional deflection device 43, the light spot of the optical signal S2 is located at the position Wx1 of the third directional deflection device 43 in the x-axis direction, and the third directional deflection device 43 emits the optical signal S2 to the optical modulator 44 at an angle γ2, and the angle γ1 is different from the angle γ2. Therefore, when the optical signal S2 is transmitted to the optical modulator 44, the light spot of the optical signal S1 and the light spot of the optical signal S2 are located at different positions of the optical modulator 44 in the x-axis direction. Exemplarily, when the optical signal of the first wavelength band includes multiple optical signals, when the optical signal of the first wavelength band is transmitted to the third directional deflection device 43, the light spot of the optical signal of the first wavelength band is located at the same position of the third directional deflection device 42 in the x-axis direction, and the third directional deflection device 43 emits the optical signal of the first wavelength band to the optical modulator 44 at different angles, so that the light spot of the optical signal of the first wavelength band is located at different positions of the optical modulator 44 in the x-axis direction.

[0078] The optical modulator 44 is used to modulate the optical signal S2 to generate a modulated optical signal S12. Exemplarily, the optical modulator 44 is specifically used to change the angle between the optical signal S2 and the z-axis direction in the port plane and / or the angle between the optical signal S2 and the z-axis direction in the dispersion plane when the optical signal S2 is emitted from the optical modulator 44, thereby generating the modulated optical signal S12, wherein the optical modulator 44 does not change the wavelength of the optical signal S2, when the wavelength of the optical signal S2 belongs to the first wavelength band, the wavelength of the modulated optical signal S12 also belongs to the first wavelength band, and the modulated optical signal of the first wavelength band includes the modulated optical signal S12.

[0079] Among them, since the third directional deflection device 43 is provided, the third directional deflection device 43 emits the optical signal of the first wavelength band to the optical modulator at different second angles, and the second angle is the angle between the direction in which the optical signal of the first wavelength band is emitted from the third directional deflection device 43 and the first direction in the plane where the first direction and the third direction are located. Such a wavelength selective switch 40 can transmit the optical signal of the first wavelength band to any position of the optical modulator 44 in the third direction through the third directional deflection device 43, that is, the optical signal of the first wavelength band can be transmitted to the same position of the optical modulator in the second direction, and to different positions of the optical modulator 44 in the third direction, further improving the flexibility of the wavelength selective switch.

[0080] Exemplarily, the wavelength selective switch 40 further includes a plurality of second ports, which are arranged with the first port along the y-axis direction, wherein the second port may be, for example, a branch port of the wavelength selective switch 40, and a second port of the wavelength selective switch 40 is connected to an output optical fiber. Then, the phase change direction of the optical modulator 44 in the wavelength selective switch 40 is parallel to the y-axis direction; or, the phase change direction of the optical modulator 44 in the wavelength selective switch 40 has a component parallel to the y-axis direction, and the phase change direction of the optical modulator 44 has a component parallel to the x-axis direction. Therefore, the optical modulator 44 specifically changes the angle between the optical signal of the first wavelength band and the z-axis direction in the port plane when the optical signal of the first wavelength band is emitted from the optical modulator 44, thereby generating a modulated optical signal of the first wavelength band, so that the modulated optical signal of the first wavelength band can be transmitted to at least one second port of the wavelength selective switch 40. Exemplarily, when the modulated optical signal S11 and the modulated optical signal S12 are respectively transmitted to different positions of the wavelength multiplexing / demultiplexing device 41, the wavelength multiplexing / demultiplexing device 41 is used to transmit the modulated optical signal S11 and the modulated optical signal S12 to a second port of the wavelength selective switch 40. Exemplarily, when the modulated optical signal S11 and the modulated optical signal S12 are transmitted to the same position of the wavelength multiplexing / demultiplexing device 41 (the same position in the y-axis direction and the same position in the x-axis direction), the wavelength multiplexing / demultiplexing device 41 is used to combine the modulated optical signal S11 and the modulated optical signal S12 into a combined optical signal, and transmit the combined optical signal to a second port of the wavelength selective switch 40.

[0081] Exemplarily, when the wavelength selective switch 40 includes a plurality of second ports, and the plurality of second ports and the first port are arranged in an array in a plane where the x-axis direction and the y-axis direction are located, and each column is arranged along the y-axis direction, the phase change direction of the optical modulator 44 in the wavelength selective switch 40 has a component parallel to the y-axis direction, and the phase change direction of the optical modulator 44 has a component parallel to the x-axis direction. Taking the modulated optical signal S11 as an example, when the second port to which the modulated optical signal S11 needs to be transmitted is located at different positions in the x-axis direction from the first port and located at the same position in the y-axis direction, the optical modulator 44 is specifically used to change the angle between the optical signal S1 and the z-axis direction in the dispersion plane when the optical signal S1 is emitted from the optical modulator 44, thereby generating the modulated optical signal S11; when the second port to which the modulated optical signal S11 needs to be transmitted is located at the same position in the x-axis direction from the first port and located at different positions in the y-axis direction, the optical modulator 44 is specifically used to change the angle between the optical signal S1 and the z-axis direction in the port plane when the optical signal S1 is emitted from the optical modulator 44, thereby generating a modulated optical signal S11; when the second port to which the modulated optical signal S11 needs to be transmitted is located at different positions in the x-axis direction and at different positions in the y-axis direction from the first port, the optical modulator 44 is specifically used to change the angle between the optical signal S1 and the z-axis direction in the dispersion plane and the angle between the optical signal S1 and the z-axis direction in the port plane when the optical signal S1 is emitted from the optical modulator 44, thereby generating a modulated optical signal S11. After the optical modulator 44 generates a modulated optical signal of the first wavelength band, the optical modulator 44 transmits the modulated optical signal of the first wavelength band to at least one second port of the wavelength selective switch through the third directional deflection device 43, the second directional deflection device 42 and the wavelength combiner / demultiplexer 41.

[0082] Among them, the third directional deflection device 43 is used to transmit the modulated optical signal of the first band to the second directional deflection device 42; the second directional deflection device 42 is used to transmit the modulated optical signal of the first band to the wavelength combiner / demultiplexer 41; the wavelength combiner / demultiplexer 41 is used to transmit the modulated optical signal of the first band to at least one second port of the wavelength selection switch 40.

[0083] In other embodiments, reference Figure 6 As shown, the m optical signals also include an optical signal Sm, wherein the optical signal of the first band includes an optical signal S1 and an optical signal S2, and the optical signal of the second band includes an optical signal Sm. The second direction deflection device 42 is also used to transmit the optical signal of the second band to the third direction deflection device 43 at a third angle. The third angle is the angle between the direction in which the optical signal of the second band is emitted from the second direction deflection device 42 and the first direction in the plane where the first direction and the second direction are located. The absolute value of the third angle is greater than or equal to 0 degree and less than 90 degrees, and the first angle is different from the third angle.

[0084] Exemplarily, the first angle is different from the third angle, and the absolute values ​​of the first angle and the third angle may be equal, but the first angle and the third angle are reciprocals of each other; or, the first angle and the third angle may have the same sign (both positive or both negative), but the absolute values ​​are not equal; or, the first angle may be positive or negative, and the third angle may be 0; or, the first angle may be 0, and the third angle may be positive or negative.

[0085] For example, refer to Figure 6 As shown in (a), the optical signal of the second wavelength band includes the optical signal Sm, and the third angle may be an angle β2. The second direction deflection device 42 emits the optical signal Sm to the third direction deflection device 43 at an angle β2, and the angle β2 is the angle between the direction of the optical signal Sm emitted from the second direction deflection device 42 and the z-axis direction in the port plane of the wavelength selective switch 40. Figure 6 As shown in (a), when the optical signal S1 and the optical signal Sm are transmitted to the second direction deflection device 42, the light spot of the optical signal S1 and the light spot of the optical signal Sm are both located at the position Wy1 of the second direction deflection device 42 in the y-axis direction, and Figure 6 The angle β1 shown in (a) is specifically a negative number. When the optical signal S1 is emitted to the third direction deflection device 43 at the angle β1 and then transmitted to the optical modulator 44, the light spot of the optical signal S1 is exactly located at the position Wy2 of the optical modulator 44 in the y-axis direction; Figure 6 The angle β2 shown in (a) is specifically a positive number. When the optical signal Sm is emitted to the third direction deflection device 43 at the angle β2 and then transmitted to the optical modulator 44, the light spot of the optical signal Sm is exactly located at the position Wy3 of the optical modulator 44 in the y-axis direction. In some embodiments, the absolute values ​​of the angle β1 and the angle β2 are equal, and the angle β1 and the angle β2 are reciprocal numbers, so that the distance between the position Wy3 and the position Wy1 in the y-axis direction is equal to the distance between the position Wy2 and the position Wy1 in the y-axis direction.

[0086] In other embodiments, the angle β1 and the angle β2 may have the same sign (for example, both are positive or negative), and the absolute values ​​of the angle β1 and the angle β2 are not equal, so that when the optical signal S1 and the optical signal Sm are transmitted to the optical modulator 44, the light spot of the optical signal S1 and the light spot of the optical signal Sm are located on the same side of the position Wy1 of the optical modulator 44 in the y-axis direction. Alternatively, the angle β1 may be 0, and the angle β2 may be a negative number or a positive number, so that when the optical signal S1 and the optical signal Sm are transmitted to the optical modulator 44, the light spot of the optical signal S1 is located at the position Wy1 of the optical modulator 44 in the y-axis direction, and the light spot of the optical signal Sm is located on one side of the position Wy1 of the optical modulator 44 in the y-axis direction. Alternatively, the angle β1 can be negative or positive, and the angle β2 can be 0, so that when the optical signal S1 and the optical signal Sm are transmitted to the optical modulator 44, the light spot of the optical signal S1 is located on one side of the position Wy1 of the optical modulator 44 in the y-axis direction, and the light spot of the optical signal Sm is located at the position Wy1 of the optical modulator 44 in the y-axis direction.

[0087] Exemplarily, the third directional deflection device 43 is further used to transmit the optical signal of the second wavelength band to the optical modulator 44 at a different fourth angle, the fourth angle being the angle between the direction in which the optical signal of the second wavelength band is emitted from the third directional deflection device 43 and the first direction in the plane where the first direction and the third direction are located, and the absolute value of the fourth angle is greater than or equal to 0 degrees and less than 90 degrees. Exemplarily, when the optical signal of the second wavelength band includes the optical signal Sm, the fourth angle of the optical signal Sm is specifically referenced Figure 6 The angle γm shown in (b) of FIG. 1 is that the third directional deflection device 42 emits the optical signal Sm to the optical modulator 44 at an angle γm, and the angle γm is the angle between the direction in which the optical signal Sm is emitted from the third directional deflection device 43 and the z-axis direction in the dispersion plane of the wavelength selective switch 40. Figure 6 As shown in (b) in FIG. 1 , when the optical signal Sm is transmitted to the third direction deflection device 43, the light spot of the optical signal Sm is located at the position Wx1 of the third direction deflection device 43 in the x-axis direction, and Figure 6The angle γm shown in (b) is specifically a negative number. When the light signal Sm is emitted to the light modulator 44 at the angle γm, the light spot of the light signal Sm is exactly located at the position Wx5 of the light modulator 44 in the x-axis direction. In other embodiments, the angle γm is specifically 0. When the light signal Sm is emitted to the light modulator 44 at the angle γm, the light spot of the light signal Sm is exactly located at the position Wx1 of the light modulator 44 in the x-axis direction. In some other embodiments, the angle γm is specifically a positive number. When the light signal S1 is emitted to the light modulator 44 at the angle γm, the light spot of the light signal Sm is exactly located at the position Wx2 of the light modulator 44 in the x-axis direction. In the x-axis direction of the light modulator 44, the position Wx2 and the position Wx6 are located on both sides of the position Wx7, respectively. Among them, the value of the angle γm can be determined according to the position of the light signal Sm transmitted to the third direction deflection device 43 in the x-axis direction, and the position of the light spot of the light signal Sm in the x-axis direction of the light modulator 44.

[0088] The angle γ1 and the angle γm may be equal or unequal. Generally, when the optical signal Sm and the optical signal S1 are transmitted to the third directional deflection device 43, the light spot of the optical signal Sm and the light spot of the optical signal S1 are located at the same position of the third directional deflection device 43 in the x-axis direction. Then, when the optical signal S1 and the optical signal Sm need to be transmitted to the same position of the optical modulator 44 in the x-axis direction, the angle γ1 and the angle γm may be equal. When the optical signal S1 and the optical signal Sm need to be transmitted to different positions of the optical modulator 44 in the x-axis direction, the angle γ1 and the angle γm are unequal.

[0089] In some examples, according to the position of the optical signal S1 transmitted to the third directional deflection device 43 in the x-axis direction, the angle γ1 is adjusted so that the light spot of the optical signal S1 is close to the center of the optical modulator 44 in the x-axis direction; according to the position of the optical signal Sm transmitted to the third directional deflection device 43 in the x-axis direction, the angle γm is adjusted so that the light spot of the optical signal Sm is close to the center of the optical modulator 44 in the x-axis direction, and the value of the angle γm can be determined.

[0090] After the optical signal in the second wavelength band is transmitted to the optical modulator 44, the optical modulator 44 is used to modulate the optical signal in the second wavelength band to generate a modulated optical signal in the second wavelength band, and transmit the modulated optical signal in the second wavelength band to at least one second port of the wavelength selective switch 40 through the third directional deflection device 43, the second directional deflection device 42 and the wavelength multiplexer / demultiplexer 41. The optical modulator 44 is specifically used to change the angle between the optical signal Sm and the z-axis direction in the port plane and / or the angle between the optical signal Sm and the z-axis direction in the dispersion plane when the optical signal Sm is emitted from the optical modulator 44, thereby generating a modulated optical signal S1m, wherein the optical modulator 44 does not change the wavelength of the optical signal Sm, and when the wavelength of the optical signal Sm belongs to the second wavelength band, the wavelength of the modulated optical signal S1m also belongs to the second wavelength band, and the modulated optical signal in the second wavelength band includes the modulated optical signal S1m.

[0091] For example, refer to Figure 6 As shown, the m optical signals also include an optical signal S(m-1), wherein the wavelength of the optical signal S(m-1) belongs to the second wavelength band, and the optical signals in the second wavelength band also include the optical signal S(m-1).

[0092] The second direction deflection device 42 is also used to emit the optical signal S(m-1) to the third direction deflection device 43 at an angle β2. Figure 6 As shown in (a), when the optical signal S(m-1) is transmitted to the second direction deflection device 42, the light spot of the optical signal S(m-1) is located at the position Wy1 of the second direction deflection device 42 in the y-axis direction, and the second direction deflection device 42 emits the optical signal S(m-1) at an angle β2 to the third direction deflection device 43. Therefore, when the optical signal S(m-1) is transmitted to the optical modulator 44, the light spot of the optical signal S(m-1) is also located at the position Wy3 of the optical modulator 44 in the y-axis direction. Exemplarily, when the optical signal in the second band includes multiple optical signals, when the optical signal in the second band is transmitted to the second direction deflection device 42, the light spot of the optical signal in the second band is located at the same position of the second direction deflection device 42 in the y-axis direction, and the second direction deflection device 42 emits the optical signal in the second band at an angle β2 to the third direction deflection device 43, and then transmits it to the optical modulator 44, so that the light spot of the optical signal in the second band is located at the same position of the optical modulator 44 in the y-axis direction.

[0093] The third direction deflection device 43 is also used to emit the optical signal S(m-1) to the optical modulator 44 at an angle γ(m-1). The fourth angle of the optical signal S(m-1) is specifically the angle γ(m-1), and the angle γ(m-1) is different from the angle γm, wherein the absolute values ​​of the angle γ(m-1) and the angle γm may be equal, but the angle γ(m-1) and the angle γm may be opposite to each other; or, the angle γ(m-1) and the angle γm may have the same sign (both are positive or both are negative), but the absolute values ​​are not equal; or, the angle γ(m-1) may be positive or negative, and the angle γm may be 0; or, the angle γ(m-1) may be 0, and the angle γm may be positive or negative. For example, refer to Figure 6 As shown in (b), when the optical signal S(m-1) is transmitted to the third directional deflection device 43, the spot of the optical signal S(m-1) is located at the position Wx1 of the third directional deflection device 43 in the x-axis direction, and the third directional deflection device 43 emits the optical signal S(m-1) to the optical modulator 44 at an angle γ(m-1), and the angle γ(m-1) is different from the angle γm. Therefore, when the optical signal S(m-1) is transmitted to the optical modulator 44, the spot of the optical signal S(m-1) and the spot of the optical signal Sm are located at different positions of the optical modulator 44 in the x-axis direction. Exemplarily, when the optical signal in the second band includes multiple optical signals, when the optical signal in the second band is transmitted to the third directional deflection device 43, the light spot of the optical signal in the second band is located at the same position of the third directional deflection device 42 in the x-axis direction, and the third directional deflection device 43 emits the optical signal in the second band to the optical modulator 44 at different angles, so that the light spot of the optical signal in the second band is located at different positions of the optical modulator 44 in the x-axis direction.

[0094] The optical modulator 44 is used to modulate the optical signal S(m-1) to generate a modulated optical signal S1(m-1). Exemplarily, the optical modulator 44 is specifically used to change the angle between the optical signal S(m-1) and the z-axis direction in the port plane and / or the angle between the optical signal S(m-1) and the z-axis direction in the dispersion plane when the optical signal S(m-1) is emitted from the optical modulator 44, thereby generating the modulated optical signal S1(m-1), wherein the optical modulator 44 does not change the wavelength of the optical signal S(m-1), and when the wavelength of the optical signal S(m-1) belongs to the second wavelength band, the wavelength of the modulated optical signal S1(m-1) also belongs to the second wavelength band, and the modulated optical signal of the second wavelength band includes the modulated optical signal S1(m-1).

[0095] Exemplarily, when m optical signals are divided into a first band and a second band, the first band and the second band have no intersection, that is, each wavelength in the first band is different from each wavelength in the second band. Considering the relationship between wavelength and frequency, it can also be said that the frequencies of the first band and the second band have no intersection. The sum of the frequency range of the first band and the frequency range of the second band may be greater than or equal to the frequency range of the m optical signals.

[0096] Exemplary references Figure 7 As shown, among the m optical signals, when the optical signal in the first band includes multiple optical signals and the optical signal in the second band includes multiple optical signals, the optical signal in the first band and the optical signal in the second band are transmitted to the optical modulator 44, and the optical signal in the first band and the optical signal in the second band are received on one side in the -z direction of the optical modulator 44, wherein the light spots of the optical signal in the first band are arranged along the x-axis direction, the light spots of the optical signal in the second band are arranged along the x-axis direction, and the optical signal in the first band and the optical signal in the second band are arranged along the y-axis direction. In some embodiments, m is an even number, and the optical signal of the first band includes the optical signal S1 to the optical signal S(m / 2), and the optical signal of the second band includes the optical signal S(m / 2+1) to the optical signal Sm. It can also be that the optical signal S1 and the optical signal S(m / 2+1) are located at different positions of the optical modulator 44 in the y-axis direction, and are located at the same position of the optical modulator 44 in the x-axis direction; the optical signal S2 and the optical signal S(m / 2+2) are located at different positions of the optical modulator 44 in the y-axis direction, and are located at the same position of the optical modulator 44 in the x-axis direction; the optical signal S(m / 2-1) and the optical signal S(m-1) are located at different positions of the optical modulator 44 in the y-axis direction, and are located at the same position of the optical modulator 44 in the x-axis direction; the optical signal S(m / 2) and the optical signal Sm are located at different positions of the optical modulator 44 in the y-axis direction, and are located at the same position of the optical modulator 44 in the x-axis direction. Among them, among the optical signals of the first wavelength band, the light spot of the optical signal with a wavelength in the middle of the first wavelength band is close to the center of the optical modulator 44 in the x-axis direction, and among the optical signals of the second wavelength band, the light spot of the optical signal with a wavelength in the middle of the second wavelength band is close to the center of the optical modulator 44 in the x-axis direction. Under the premise of not changing the size of the optical modulator 44, the optical signals of the first wavelength band and the optical signals of the second wavelength band are arranged along the y-axis direction on the optical modulator 44, and the light spots of the optical signals of the first wavelength band and the light spots of the optical signals of the second wavelength band are close to the center of the optical modulator 44 in the x-axis direction, so that the optical modulator 44 can modulate more optical signals, thereby increasing the number of ports of the wavelength selective switch.

[0097] Specifically, refer to Figure 8As shown, in one example, the second direction deflecting device 42 includes a deflecting device 421 and a deflecting device 422, and the deflecting device 421 and the deflecting device 422 are arranged along the x-axis direction.

[0098] The deflection device 421 is used to transmit the optical signal of the first wavelength band to the third direction deflection device 43 at a first angle. Exemplarily, the deflection device 421 specifically needs to transmit the optical signal of the first wavelength band at an angle (for example, Figure 6 The optical signal of the first band is transmitted to the third directional deflection device 43 by the angle β1 in the first band. Therefore, the position, size and placement of the deflection device 421 need to be determined according to the frequency range of the optical signal of the first band and the divergence of the optical signal, combined with the angle β1, so that the deflection device 421 can receive the optical signal of the first band. The deflection device 421 includes any one of the following: a reflector, a micro-electro-mechanical system (MEMS) micro-mirror, a grating, and a prism.

[0099] The deflection device 422 is used to transmit the optical signal of the second wavelength band to the third direction deflection device 43 at a third angle. Exemplarily, the deflection device 422 specifically needs to transmit the optical signal of the second wavelength band at an angle (for example, Figure 6 The optical signal of the second band is transmitted to the third directional deflection device 43 by the angle β2 in the figure. In this way, the position, size and placement of the deflection device 422 need to be determined according to the frequency range of the optical signal of the second band and the divergence of the optical signal, combined with the angle β2, so that the deflection device 422 can receive the optical signal of the second band. The deflection device 422 includes any one of the following: a reflector, a MEMS micromirror, a grating, and a prism.

[0100] In some embodiments, the deflection device 421 and the deflection device 422 may be integrated into one deflection device, the first part of the integrated deflection device is used to perform the function of the deflection device 421, the second part of the integrated deflection device is used to perform the function of the deflection device 422, and the first part and the second part are arranged along the x-axis direction in the integrated deflection device.

[0101] Specifically, refer to Fig. 9 As shown, in one example, the third direction deflection device 43 includes a deflection device 431 and a deflection device 432, and the deflection device 431 and the deflection device 432 are arranged along the y-axis direction.

[0102] The deflection device 431 is used to transmit the optical signal of the first band to the optical modulator 44 at different third angles. Exemplarily, the deflection device 431 specifically needs to transmit the optical signal of the first band to the optical modulator 44 at different third angles. In this way, it is necessary to determine the position, size and placement of the deflection device 431 according to the frequency range of the optical signal of the first band and the divergence of the optical signal, combined with the angle β1 and the third angle, so that the deflection device 431 can receive the optical signal of the first band. The deflection device 431 includes any one of the following: a reflector, a MEMS micromirror, a grating, and a prism.

[0103] The deflection device 432 is used to transmit the optical signal of the second band to the optical modulator 44 at different fourth angles. Exemplarily, the deflection device 431 specifically needs to transmit the optical signal of the second band to the optical modulator 44 at different fourth angles. In this way, it is necessary to determine the position, size and placement of the deflection device 432 according to the frequency range of the optical signal of the second band and the divergence of the optical signal, combined with the angle β2 and the fourth angle, so that the deflection device 432 can receive the optical signal of the second band. The deflection device 432 includes any one of the following: a reflector, a MEMS micromirror, a grating, and a prism.

[0104] In some embodiments, the deflection device 431 and the deflection device 432 may be integrated into one deflection device, and the first part of the integrated deflection device is used to perform the function of the deflection device 431, and the second part of the integrated deflection device is used to perform the function of the deflection device 432, and the first part and the second part are arranged along the y-axis direction in the integrated deflection device.

[0105] Exemplarily, in some embodiments, when the second direction deflection device 42 includes a deflection device 421 and a deflection device 422, and the third direction deflection device 43 includes a deflection device 431 and a deflection device 432, the deflection device 421 and the deflection device 431 act on the optical signal of the first band, and the deflection device 422 and the deflection device 432 act on the optical signal of the second band.

[0106] For example, refer to Fig.10 As shown, Fig.10 (a) is specifically a port plane diagram of the wavelength selective switch 40; Fig.10 (b) is a schematic diagram of the dispersion plane of the wavelength selective switch 40; Fig.10Among them, the m optical signals include optical signals in the C band and optical signals in the L band. The above-mentioned first band may be the C band, and the second band may be the L band. Among them, the m optical signals include optical signal S1, optical signal S2... optical signal S(m - 1), optical signal Sm. The optical signals in the C band include optical signal S1, optical signal S2... optical signal Sn, and the optical signals in the L band include optical signal S(n + 1)... optical signal S(m - 1), optical signal Sm, where 1 < n < m. And in Fig.10 Among them, the second-direction deflection device 42 includes a deflection device 421 and a deflection device 422, and the third-direction deflection device 43 includes a deflection device 431 and a deflection device 432.

[0107] Referring to Fig.10 As shown, during the process of the m optical signals being transmitted from the multiplexer / demultiplexer 41 to the optical modulator 44, the multiplexer / demultiplexer 41 outputs the m optical signals and transmits the m optical signals to the second-direction deflection device 42. Specifically, the multiplexer / demultiplexer 41 transmits the m optical signals to the second-direction deflection device 42 at different dispersion angles. The deflection device 421 in the second-direction deflection device 42 transmits the optical signals in the first band to the deflection device 431 at an angle β1. The angle β1 is the included angle between the direction of the optical signals in the first band exiting from the deflection device 421 and the z-axis direction within the port plane, and the absolute value of the angle β1 is greater than 0 degree and less than 90 degrees. The deflection device 422 in the second-direction deflection device 42 transmits the optical signals in the second band to the deflection device 432 at an angle β2. The angle β2 is the included angle between the direction of the optical signals in the second band exiting from the deflection device 422 and the z-axis direction within the port plane, and the absolute value of the angle β2 is greater than 0 degree and less than 90 degrees. The deflection device 431 in the third-direction deflection device 43 transmits the optical signals in the first band to the optical modulator 44 at a different second angle. The third angle is the included angle between the direction of the optical signals in the first band exiting from the deflection device 431 and the z-axis direction within the dispersion plane. The deflection device 432 in the third-direction deflection device 43 transmits the optical signals in the second band to the optical modulator 44 at a different fourth angle. The fourth angle is the included angle between the direction of the optical signals in the second band exiting from the deflection device 432 and the z-axis direction within the dispersion plane.

[0108] Exemplarily, referring to Fig.10As shown, the wavelength selective switch 40 further includes a lens 45, a lens 46, a lens 47, a lens 48 and a lens 49. Along the z-axis direction (i.e., the first direction mentioned above), the lens 45 is disposed between the wavelength multiplexer / demultiplexer 41 and the second direction deflection device 42, the lens 46 is disposed between the second direction deflection device 42 and the third direction deflection device 43, the lens 47 is disposed between the third direction deflection device 43 and the optical modulator 44, the lens 48 is disposed between the third direction deflection device 43 and the lens 47, and the lens 49 is disposed between the lens 47 and the optical modulator 44. Among them, the lens planes of the lenses 48 and 49 are parallel to the port plane, the lens plane of the lens 47 is parallel to the dispersion plane, and the lens planes of the lenses 46 and 45 are parallel to the port plane and parallel to the dispersion plane.

[0109] The lens 45 is used to collimate the m optical signals in the x-axis direction (i.e., the third direction mentioned above). Specifically, the dispersion angle of each of the m optical signals generated by the wavelength multiplexer / demultiplexer 41 is different, so each of the m optical signals will be transmitted to a different position of the lens 45. After the lens 45 collimates the m optical signals in the x-axis direction, each of the m optical signals can be transmitted to the second direction deflection device 42 while maintaining a constant position in the x-axis direction after being emitted from the lens 45.

[0110] The lens 46 is used to collimate the m optical signals in the y-axis direction (i.e., the second direction mentioned above). Specifically, the lens 46 collimates the optical signals of the first wavelength band in the y-axis direction and collimates the optical signals of the second wavelength band in the y-axis direction. Fig.10 As shown, the deflection device 421 transmits the light signal of the first band to the lens 46 at an angle β1. After the lens 46 collimates the light signal of the first band, the light signal of the first band can be transmitted to the deflection device 431 and the lens 48 while maintaining the position Wy2 unchanged in the y-axis direction after being emitted from the lens 46; the deflection device 422 transmits the light signal of the second band to the lens 46 at an angle β2. After the lens 46 collimates the light signal of the second band, the light signal of the second band can be transmitted to the deflection device 432 and the lens 48 while maintaining the position Wy3 unchanged in the y-axis direction after being emitted from the lens 46.

[0111] When the optical signal of the first wavelength band is transmitted to the third directional deflection device 43, the position of the optical signal of the first wavelength band in the y-axis direction does not change and is always at position Wy2, so the position of the deflection device 431 in the third directional deflection device 43 in the y-axis direction covers position Wy2, so that the deflection device 431 can receive the optical signal of the first wavelength band. When the optical signal of the second wavelength band is transmitted to the third directional deflection device 43, the position of the optical signal of the second wavelength band in the y-axis direction does not change and is always at position Wy3, so the position of the deflection device 432 in the third directional deflection device 43 in the y-axis direction covers position Wy3, so that the deflection device 432 can receive the optical signal of the second wavelength band.

[0112] The lens 46 is also used to focus the m optical signals in the x-axis direction (i.e., the third direction mentioned above). Specifically, the lens 46 focuses the optical signals of the first wavelength band in the x-axis direction and focuses the optical signals of the second wavelength band in the x-axis direction. Fig.10 As shown, after the optical signal in the first wavelength band and the optical signal in the second wavelength band are emitted through the lens 46, they will be focused on the same position Wx1 of the third directional deflection device 43 in the x-axis direction. Therefore, the position of the deflection device 431 in the third directional deflection device 43 in the x-axis direction needs to cover the position Wx1, and the position of the deflection device 432 in the third directional deflection device 43 in the x-axis direction needs to cover the position Wx1. Wherein, when the optical signal in the first wavelength band includes multiple optical signals, the optical signals in the first wavelength band are focused on the same position Wx1 in the x-axis direction from different positions in the x-axis direction. Therefore, the angles between the direction in which the optical signal in the first wavelength band is transmitted to the deflection device 431 in the dispersion plane and the z-axis direction are different. Then, when the deflection device 431 is a reflector, after the placement position of the deflection device 431 is determined, the deflection device 431 can transmit the optical signal in the first wavelength band to the lens 47 through the lens 48 at different second angles. When the optical signal of the second band includes multiple optical signals, the optical signals of the second band are focused from different positions in the x-axis direction to the same position Wx1 in the x-axis direction. Therefore, the angles between the direction in which the optical signal of the second band is transmitted to the deflection device 432 in the dispersion plane and the z-axis direction are different. Then, when the deflection device 431 is a reflector, after the placement position of the deflection device 431 is determined, the deflection device 432 can transmit the optical signal of the second band to the lens 47 through the lens 48 at different fourth angles.

[0113] The lens 48 is used to focus the m optical signals in the y-axis direction. Specifically, the lens 48 focuses the optical signals of the first wavelength band in the y-axis direction and focuses the optical signals of the second wavelength band in the y-axis direction. Fig.10As shown, lens 48 focuses the light signal of the first band in the y-axis direction, so that the light signal of the first band is focused from position Wy2 of lens 48 in the y-axis direction to position Wy4 of lens 47 in the y-axis direction, and then transmitted to position Wy6 of lens 49 in the y-axis direction; lens 48 focuses the light signal of the second band in the y-axis direction, so that the light signal of the second band is focused from position Wy3 of lens 48 in the y-axis direction to position Wy4 of lens 47 in the y-axis direction, and then transmitted to position Wy5 of lens 49 in the y-axis direction.

[0114] The lens 47 is used to collimate the m optical signals in the x-axis direction. Specifically, the lens 47 collimates the optical signals of the first wavelength band in the x-axis direction and collimates the optical signals of the second wavelength band in the x-axis direction. Fig.10 As shown, on the dispersion plane, the deflection device 431 transmits the optical signal of the first band to the lens 47 through the lens 48 at different second angles, so the optical signal of the first band will be transmitted to different positions of the lens 47. After the lens 47 collides the optical signal of the first band in the x-axis direction, the optical signal of the first band can be kept in the x-axis direction after being emitted from the lens 47 and transmitted to the optical modulator 44 through the lens 49; on the dispersion plane, the deflection device 432 transmits the optical signal of the L band to the lens 47 through the lens 48 at different fourth angles, so the optical signal of the second band will be transmitted to different positions of the lens 47. After the lens 47 collides the optical signal of the second band in the x-axis direction, the optical signal of the second band can be kept in the x-axis direction after being emitted from the lens 47 and transmitted to the optical modulator 44 through the lens 49.

[0115] The lens 49 is used to collimate the m optical signals in the y-axis direction. Specifically, the lens 49 collimates the optical signals of the first wavelength band in the y-axis direction and collimates the optical signals of the second wavelength band in the y-axis direction. Fig.10 As shown, the lens 49 is used to collimate the optical signal of the first band in the y-axis direction, so that the optical signal of the first band can maintain the position Wy6 in the y-axis direction after being emitted from the lens 49 and be transmitted to the optical modulator 44; the lens 49 is used to collimate the optical signal of the second band in the y-axis direction, so that the optical signal of the second band can maintain the position Wy5 in the y-axis direction after being emitted from the lens 49 and be transmitted to the optical modulator 44.

[0116] Among them, compared with Figure 6 In the wavelength selection switch shown, since lenses 48 and lens 49 are arranged between the second direction deflection device 42 and the optical modulator 44, the optical signal of the first band is finally transmitted to the position Wy6 of the optical modulator 44 in the y-axis direction, and the optical signal of the second band is finally transmitted to the position Wy5 of the optical modulator 44 in the y-axis direction.

[0117] For example, Fig.10 In the wavelength selective switch shown, along the z-axis direction, the second direction deflection device 42 is arranged at the focal plane of the lens 46, specifically, the second direction deflection device 42 is arranged at the focal plane of the lens 46 in the -z direction. The third direction deflection device 43 is arranged at the focal plane of the lens 46, specifically, the third direction deflection device 43 is arranged at the focal plane of the lens 46 in the z direction. The third direction deflection device 43 is also arranged at the focal plane of the lens 47, specifically, the third direction deflection device 43 is arranged at the focal plane of the lens 47 in the -z direction. The focal length of the lens 47 is greater than the focal length of the lens 46. Exemplarily, when the focal length of the lens 47 is f1, the focal length of the lens 46 is f2, and f1 is greater than f2, the size of the spot of any optical signal in the x-axis direction will be magnified, and the magnification is f2 / f1.

[0118] For example, refer to Fig.10 As shown, along the z-axis direction, the wavelength combiner / demultiplexer 41 is arranged at the focal plane of the lens 45 in the -z direction, the second direction deflection device 42 is arranged at the focal plane of the lens 45 in the z direction, and the focal plane of the lens 45 in the z direction coincides with the focal plane of the lens 46 in the -z direction; the third direction deflection device 43 is arranged at the focal plane of the lens 48 in the -z direction, the lens 47 is arranged at the focal plane of the lens 48 in the z direction, and the focal length of the lens 48 is equal to half of the focal length of the lens 47; the lens 47 is arranged at the focal plane of the lens 49 in the -z direction, the optical modulator 44 is arranged at the focal plane of the lens 49 in the z direction, and the focal plane of the lens 49 in the -z direction coincides with the focal plane of the lens 48 in the z direction.

[0119] After the m optical signals are transmitted to the optical modulator 44, the optical modulator 44 modulates the m optical signals respectively to generate m modulated optical signals. When the m optical signals include optical signals of the first wavelength band and optical signals of the second wavelength band, the m modulated optical signals include modulated optical signals of the first wavelength band and modulated optical signals of the second wavelength band.

[0120] For example, refer to Fig.11 As shown, an embodiment of the present application provides a schematic diagram of a modulated optical signal being transmitted to the second port of a wavelength selective switch 40 through lens 49, lens 47, lens 48, a third direction deflection device 43, lens 46, a second direction deflection device 42, lens 45, and a wavelength combiner / demultiplexer 41. Fig.11 (a) is specifically a port plane diagram of the wavelength selective switch 40; Fig.11 (b) is specifically a schematic diagram of the dispersion plane of the wavelength selective switch 40.

[0121] For example, Fig.11As shown, lens 49 is used to focus the m modulated light signals in the y-axis direction. Specifically, lens 49 is used to focus the modulated light signals of the first band in the y-axis direction, transmit them to lens 48 through lens 47, and focus the modulated light signals of the second band in the y-axis direction, transmit them to lens 48 through lens 47. Lens 47 is used to focus the m modulated light signals in the x-axis direction. Specifically, lens 47 is used to focus the modulated light signals of the first band in the x-axis direction, transmit them to deflection device 431 through lens 48, focus the modulated light signals of the second band in the x-axis direction, and transmit them to deflection device 432 through lens 48. Lens 48 is used to collimate the m modulated light signals in the y-axis direction. Specifically, the lens 48 is used to collimate the modulated light signal of the first band in the y-axis direction, and collimate the modulated light signal of the second band in the y-axis direction. In the y-axis direction, the collimated modulated light signal of the first band is transmitted to the lens 46 through the deflection device 431, and the collimated modulated light signal of the second band is transmitted to the lens 46 through the deflection device 432. The deflection device 431 is used to transmit the modulated light signal of the first band to the lens 46 at different angles (in the dispersion plane, the angle between the direction in which any light signal of the first band is emitted from the deflection device 431 and the z-axis direction). The deflection device 432 is used to transmit the modulated light signal of the second band to the lens 46 at different angles (in the dispersion plane, the angle between the direction in which any light signal of the second band is emitted from the deflection device 432 and the z-axis direction). The lens 46 is used to focus the m modulated light signals in the y-axis direction. Specifically, the lens 46 is used to focus the modulated light signal of the first band in the y-axis direction and the modulated light signal of the second band in the y-axis direction. The lens 46 is also used to focus the m modulated light signals in the x-axis direction. Specifically, the lens 46 focuses the modulated light signal of the first band in the x-axis direction and the modulated light signal of the second band in the x-axis direction. The deflection device 421 is used to transmit the modulated light signal of the first band to the lens 45 at an angle (the angle between the direction of any light signal of the first band emitted from the deflection device 421 and the z-axis direction in the port plane), and the deflection device 422 is used to transmit the modulated light signal of the second band to the lens 45 at an angle (the angle between the direction of any light signal of the second band emitted from the deflection device 422 and the z-axis direction in the port plane). The lens 45 is also used to focus the m modulated light signals in the x-axis direction. Specifically, the lens 45 is used to focus the modulated light signal of the first band in the x-axis direction and the modulated light signal of the second band in the x-axis direction. The lens 45 is also used to focus the m modulated light signals in the y-axis direction. Specifically, the lens 45 is also used to focus the modulated light signal of the first band in the y-axis direction and the modulated light signal of the second band in the y-axis direction.When the modulated optical signal of the first band and the modulated optical signal of the second band are respectively transmitted to different positions (different positions along the x-axis direction and / or different positions along the y-axis direction) of the wavelength combiner / demultiplexer 41, the wavelength combiner / demultiplexer 41 transmits the modulated optical signal of the first band and the modulated optical signal of the second band to the m second ports of the wavelength selective switch 40 respectively.

[0122] In some embodiments, a lens 51 and a microlens array 52 are further provided between the wavelength multiplexer / demultiplexer 41 and the second port. The number of lenses in the microlens array 52 is the same as the number of ports of the wavelength selective switch, and the arrangement of the lenses in the microlens array 52 is the same as the port arrangement of the wavelength selective switch 40. The lens 51 is used to collimate the m modulated optical signals in the y-axis direction, so that the transmission directions of the m modulated optical signals are parallel to the z-axis and are transmitted to the microlens array 52; the lens 51 is also used to focus the m modulated optical signals in the x-axis direction; one lens in the microlens array 52 is used to change the light spot of a modulated optical signal in the y-axis direction, for example, to reduce the light spot of a modulated optical signal, and then transmit it to a second port; one lens in the microlens array 52 is also used to collimate the modulated optical signal in the x-axis direction, and then transmit it to a second port.

[0123] In some embodiments, at least two of the modulated optical signals of the first wavelength band and the modulated optical signals of the second wavelength band are transmitted to the same position of the wavelength combiner / demultiplexer 41 (the same position along the x-axis direction and the same position along the y-axis direction). The wavelength combiner / demultiplexer 41 combines the at least two modulated optical signals into a combined optical signal, and transmits the combined optical signal to a second port of the wavelength selective switch 40. A lens 51 and a microlens array 52 are also provided between the wavelength combiner / demultiplexer 41 and the second port. The lens 51 is used to collimate the combined optical signal in the y-axis direction, so that the transmission direction of the combined optical signal is parallel to the z-axis and is transmitted to the lens group 52; the lens 51 is also used to focus the combined optical signal in the x-axis direction; the lens in the microlens array 52 corresponding to the second port is used to change the spot of the combined optical signal in the y-axis direction, for example, to reduce the spot of the combined optical signal, and is also used to collimate the combined optical signal in the x-axis direction, and then transmit it to the second port.

[0124] Exemplarily, a lens array may be further arranged between the second port and the microlens array 52, the number of lenses in the lens array is the same as the number of ports of the wavelength selection switch, the arrangement of the lenses in the microlens array is the same as the port arrangement of the wavelength selection switch 40, and one lens in the lens array changes the light spot of the modulated optical signal or the combined optical signal in the x-axis direction, and then transmits it to a second port.

[0125] Reference Fig.11As shown in the dotted line, after the optical modulator 44 modulates the optical signal S1 in the first band, a modulated optical signal S11 is generated, and the modulated optical signal S11 is transmitted to a second port of the wavelength selection switch through lens 49, lens 47, lens 48, a third direction deflection device 43, lens 46, a second direction deflection device 42, lens 45, and a wavelength combiner / demultiplexer 41, wherein the position of the second port in the y-axis direction is position Wy16, and the position in the x-axis direction is position Wx16.

[0126] like Fig.11 As shown, in the port plane, when the modulated optical signal S11 generated by the optical modulator 44 is emitted to the lens 49, the angle between the emission angle of the modulated optical signal S11 and the z-axis in the port plane is an angle γ10, so that the modulated optical signal S11 is transmitted to the lens 49 at position Wy10 in the y-axis direction, and the position Wy10 is located below the position Wy6. The lens 49 is used to focus the modulated optical signal S11 in the y-axis direction, and transmit it to the lens 48 at position Wy12 in the y-axis direction through the lens 47 at position Wy11 in the y-axis direction, and the position Wy11 is located below the position Wy4, and the position Wy12 is located below the position Wy2. Lens 48 is used to collimate the modulated light signal S11 in the y-axis direction, and transmit the collimated modulated light signal S11 to the lens 46 at position Wy13 in the y-axis direction through the deflection device 431, wherein when the collimated modulated light signal S11 is transmitted from the lens 48 to the lens 46, in the port plane, there is a predetermined angle between the transmission direction of the modulated light signal S11 and the z-axis direction, and position Wy13 is located above position Wy2. Lens 46 is used to focus the modulated light signal S11 in the y-axis direction, focusing on the position Wy14 of the deflection device 421 in the y-axis direction, and the position Wy14 is located above the position Wy1; the second direction deflection device 42, specifically the deflection device 421, is used to transmit the modulated light signal S11 to the lens 45 at the position Wy14 in the y-axis direction at an angle θ1; the lens 45 is used to focus the modulated light signal S11 in the y-axis direction, and transmit it to the lens 51 at the position Wy16 in the y-axis direction through the wavelength combiner / demultiplexer 41 at the position Wy15 in the y-axis direction, and the position Wy15 coincides with the position Wy1, and the position Wy16 is located below the position Wy1. The lens 51 is used to collimate the modulated light signal S11 in the y-axis direction, so that the transmission direction of the modulated light signal S11 is parallel to the z-axis and is transmitted to a lens at position Wy16 in the y-axis direction in the microlens array 52. ​​This lens in the microlens array 52 is used to change the light spot of the modulated light signal S11, for example, to reduce the light spot of the modulated light signal S11, and then transmit the modulated light signal S11 to the second port at position Wy16 in the y-axis direction.

[0127] In one example, referring to Fig.11 As shown, in the port plane, the deflection device 421 transmits the optical signal S1 to the lens 46 at an angle β3 (i.e., the first angle mentioned above), and the angle β3 is the angle between the direction in which the optical signal S1 is emitted from the deflection device 421 and the z-axis direction in the port plane. Moreover, when the optical signal S1 is transmitted from the lens 45 to the deflection device 421, the optical signal S1 is incident on the deflection device 421 along a direction parallel to the z-axis, and the angle between the direction in which the optical signal S1 is incident from the lens 45 to the deflection device 421 and the z-axis direction is an angle θ2, and in this example, the angle θ1 is 0. The deflection device 421 transmits the modulated optical signal S11 to the lens 45 at an angle θ1 of the modulated optical signal S11, and the angle θ1 is the angle between the direction in which the modulated optical signal S11 is emitted from the deflection device 421 and the z-axis direction in the port plane. The angle between the direction in which the modulated light signal S11 is incident from the lens 46 to the deflection device 421 and the z-axis direction is equal to the angle β3, that is, the direction in which the modulated light signal S11 is incident from the lens 46 to the deflection device 421 is parallel to the direction in which the light signal S1 is emitted from the deflection device 421 to the lens 46. The angle θ1 of the modulated light signal S11 is equal to the angle θ2, that is, the direction in which the modulated light signal S11 is emitted from the deflection device 421 to the lens 45 is parallel to the direction in which the light signal S1 is incident from the lens 45 to the deflection device 421. Specifically, the angle between the direction in which the light signal S1 is incident from the lens 45 to the deflection device 421 and the direction in which the light signal S1 is emitted from the deflection device 421 to the lens 46 is equal to the angle between the direction in which the modulated light signal S11 is incident from the lens 46 to the deflection device 421 and the direction in which the modulated light signal S11 is emitted from the deflection device 421 to the lens 45. Similarly, the second direction deflection device 42, specifically the deflection device 421, can transmit the modulated light signal of the first band to the lens 45 at an angle. Similarly, the second direction deflection device 42, specifically the deflection device 422, can transmit the modulated light signal of the second band to the lens 45 at an angle.

[0128] like Fig.11 As shown, when the second port moves in the y-axis direction, the modulated optical signal S11 can be transmitted to the corresponding second port by adjusting the angle γ10. When the angle γ10 is 0 degrees, it can be considered that the modulated optical signal S11 returns along the original transmission optical path of the optical signal S1 in the port plane.

[0129] like Fig.11As shown, in the dispersion plane, when the modulated light signal S11 generated by the optical modulator 44 is emitted to the lens 49, the angle between the emission angle of the modulated light signal S11 and the z-axis in the dispersion plane is an angle γ20, so that the modulated light signal S11 is transmitted to the position Wx10 of the lens 47 in the x-axis direction through the lens 49. The lens 47 is used to focus the modulated light signal S11 in the x-axis direction and transmit it to the position Wx11 of the deflection device 431 in the x-axis direction through the lens 48, and the position Wx11 is located below the position Wx1. The third direction deflection device 43, specifically the deflection device 431, is used to transmit the modulated light signal S11 to the position Wx12 of the lens 46 in the x-axis direction at an angle θ3. The lens 46 is used to focus the modulated light signal S11 in the x-axis direction and transmit it to the position Wx14 of the lens 45 in the x-axis direction through the position Wx13 of the deflection device 421 in the x-axis direction. The lens 45 is used to focus the modulated optical signal S11 in the x-axis direction at the position Wx15 of the wavelength multiplexer / demultiplexer 41 in the x-axis direction, and the wavelength multiplexer / demultiplexer 41 transmits the modulated optical signal S11 to the position Wx15 of the lens 51 in the x-axis direction. The lens 51 is used to focus the modulated optical signal S11 in the x-axis direction, so that the modulated optical signal S11 is transmitted to a lens at the position Wy16 of the microlens array 52 in the x-axis direction, and this lens in the microlens array 52 is used to collimate the modulated optical signal S11 in the x-axis direction, and then transmit the modulated optical signal S11 to the second port at the position Wx16 in the x-axis direction.

[0130] In one example, referring to Fig.11As shown, in the dispersion plane, the deflection device 431 transmits the optical signal S1 to the lens 47 at a second angle, and the second angle is the angle between the direction in which the optical signal S1 is emitted from the deflection device 431 and the z-axis direction in the dispersion plane. In addition, the angle between the direction in which the optical signal S1 is incident from the lens 46 to the deflection device 431 and the z-axis direction is an angle θ4. The deflection device 431 transmits the modulated optical signal S11 to the lens 46 at an angle θ3, and the sixth angle is the angle between the direction in which the modulated optical signal S11 is emitted from the deflection device 431 and the z-axis direction in the dispersion plane. Among them, the angle between the direction in which the modulated optical signal S11 is incident from the lens 47 to the deflection device 431 and the z-axis direction is equal to the second angle, that is, the direction in which the modulated optical signal S11 is incident from the lens 47 to the deflection device 431 is parallel to the direction in which the optical signal S1 is emitted from the deflection device 431 to the lens 47. Among them, the angle θ3 is equal to the angle θ4, that is, the direction in which the modulated light signal S11 is emitted from the deflection device 431 to the lens 46 is parallel to the direction in which the light signal S1 is incident from the lens 46 to the deflection device 431. Specifically, the angle between the direction in which the light signal S1 is incident from the lens 46 to the deflection device 431 and the direction in which the light signal S1 is emitted from the deflection device 431 to the lens 47 is equal to the angle between the direction in which the modulated light signal S11 is incident from the lens 47 to the deflection device 431 and the direction in which the modulated light signal S11 is emitted from the deflection device 431 to the lens 46. Similarly, the third directional deflection device 43, specifically the deflection device 431, can transmit the modulated light signal of the first wavelength band to the lens 46 at different angles. Similarly, the third directional deflection device 43, specifically the deflection device 432, can transmit the modulated light signal of the second wavelength band to the lens 46 at different angles.

[0131] like Fig.11 As shown, when the second port moves in the x-axis direction, the modulated optical signal S11 can be transmitted to the corresponding second port by adjusting the angle γ20. When the angle γ20 is 0 degrees, it can be considered that the modulated optical signal S11 returns along the original transmission optical path of the optical signal S1 in the dispersion plane.

[0132] For example, Fig.10 Taking the first band being the C band and the second band being the L band as an example, in other embodiments, the wavelengths of the m optical signals may all belong to the C band or the L band, wherein the second direction deflection device 42 includes a deflection device 421 and a deflection device 422. In one example, the frequency range covered by the deflection device 421 may be equal to the frequency range covered by the deflection device 422. In this case, the wavelength selection switch 40 divides the C band or the L band into the first band and the second band at a ratio of 1:1. In order to further enhance the flexibility of the wavelength selection switch 40 in dividing the first band and the second band, refer to Fig.12 As shown, the embodiment of the present application provides another wavelength selection switch 40, Fig.12 (a) is specifically a port plane diagram of the wavelength selective switch 40; Fig.12 (b) is specifically a schematic diagram of the dispersion plane of the wavelength selective switch 40.

[0133] Reference Fig.12 As shown, compared to Fig.10 The wavelength selective switch 40 shown, Fig.12 The second direction deflection device 42 in the wavelength selective switch shown further includes a deflection device 423 disposed between the deflection device 421 and the deflection device 422 along the x-axis direction, and the deflection device 423 is used to transmit the received optical signal to the third direction deflection device 43 at the first angle or the third angle.

[0134] In one example, the deflection device 423 deflects the received optical signal at a first angle ( Fig.10 β1) is transmitted to the third directional deflection device 43, then the deflection device 423 specifically converts the received optical signal into a partial optical signal of the first band. For example, when the frequency range covered by the deflection device 421 is equal to the frequency range covered by the deflection device 422, the frequency range of the first band is equal to the sum of the frequency range covered by the deflection device 421 and the frequency range covered by the deflection device 423, thereby making the frequency range of the first band greater than the frequency range of the second band. The wavelength selection switch 40 divides the C band or the L band into the first band and the second band at a ratio of x:1, where x is greater than 1. In another example, the deflection device 423 converts the received optical signal into a partial optical signal of the first band at a third angle ( Fig.10 β2) shown in the figure is transmitted to the third directional deflection device 43, then the deflection device 423 will specifically convert the received optical signal into a partial optical signal of the second band. Exemplarily, when the frequency range covered by the deflection device 421 is equal to the frequency range covered by the deflection device 422, the frequency range of the second band is equal to the sum of the frequency range covered by the deflection device 423 and the frequency range covered by the deflection device 422, thereby making the frequency range of the second band larger than the frequency range of the first band, and the wavelength selection switch 40 divides the C band or L band into the first band and the second band at a ratio of 1:x, where x is greater than 1.

[0135] Exemplarily, the deflection device 423 includes any one of the following: a reflector, a MEMS micromirror, a grating, and a prism.

[0136] In some embodiments, the deflection device 421, the deflection device 422 and the deflection device 423 may be integrated in the same deflection device, the first part of the integrated deflection device is used to perform the function of the deflection device 421, the second part of the integrated deflection device is used to perform the function of the deflection device 422, and the third part of the integrated deflection device is used to perform the function of the deflection device 423. The first part, the second part and the third part are arranged along the x-axis direction in the integrated deflection device, and along the x-axis direction, the third part is located between the first part and the second part.

[0137] For example, refer to Fig.12 As shown, Fig.12 The wavelength selective switch 40 shown may also include a lens 45, a lens 46, a lens 47, a lens 48, and a lens 49. When the deflection device 423 transmits the received optical signal to the third directional deflection device 43 at a first angle, the effect of any one of the lenses 45, 46, 47, 48, and 49 on the optical signal received by the deflection device 423 is referred to the effect of any one of the above lenses on the optical signal of the first wavelength band, which is not described in detail here. When the deflection device 423 transmits the received optical signal to the third directional deflection device 43 at a third angle, the effect of any one of the lenses 45, 46, 47, 48, and 49 on the optical signal received by the deflection device 423 is referred to the effect of any one of the above lenses on the optical signal of the second wavelength band, which is not described in detail here.

[0138] In one example, when the wavelengths of the m optical signals all belong to the C band, the C band is specifically the C6T band, wherein the C6T band includes 120 optical signals with different wavelengths, and the frequency range of the C6T band is 6000 GHZ, that is, the difference between the highest frequency and the lowest frequency of the band is 6000 GHz, and the following frequency range is also understood in this way and will not be repeated. Fig.13 As shown, the frequency range covered by the deflection device 421 is 2975 GHZ, and the frequency range covered by the deflection device 422 is 3000 GHZ. When the number of the deflection device 423 is 1 and the frequency range covered by the deflection device 423 is 25 GHZ, when the deflection device 423 transmits the received optical signal to the third-direction deflection device 43 at a first angle, the frequency range of the first band can be 3000 GHZ, and the frequency range of the second band can be 3000 GHZ; when the deflection device 423 transmits the received optical signal to the third-direction deflection device 43 at a third angle, the frequency range of the first band can be 2975 GHZ, and the frequency range of the second band can be 3025 GHZ. Fig.14As shown, the frequency range covered by the deflection device 421 is 2975GHZ, and the frequency range covered by the deflection device 422 is 2975GHZ. When the number of deflection devices 423 is 2 and the frequency range covered by one deflection device 423 is 25GHZ, when the deflection device 423 transmits the received optical signal to the third directional deflection device 43 at a first angle, the frequency range of the first band may be 3025GHZ, and the frequency range of the second band may be 2975GHZ; when the deflection device 423 transmits the received optical signal to the third directional deflection device 43 at a third angle, the frequency range of the first band may be 2975GHZ, and the frequency range of the second band may be 3025GHZ.

[0139] in, Fig.13 and Fig.14 The sum of the frequency ranges covered by the deflection device 421, the frequency ranges covered by the deflection device 422, and the frequency ranges covered by the deflection device 423 is exactly 6000 GHz. In other embodiments, Fig.13 and Fig.14 The sum of the frequency range covered by the deflection device 421, the frequency range covered by the deflection device 422, and the frequency range covered by the deflection device 423 may also be greater than 6000 GHz.

[0140] In one example, when the wavelengths of the m optical signals all belong to the L band, the L band is specifically the L6T band, wherein the L6T band includes 120 optical signals with different wavelengths, and the frequency range of the L6T band is 6000 GHZ. Then when dividing the L band into the first band and the second band, you can refer to Fig.13 or Fig.14 As shown, a deflection device 421, a deflection device 422, and a deflection device 423 are provided.

[0141] In some examples, in order to further reduce the requirements for the size of the optical modulator due to the increase in the number of ports of the wavelength selective switch, illustratively, the second direction deflection device 42 is also used to transmit the optical signal of the third band among the m optical signals to the third direction deflection device 43 at a fifth angle, and the fifth angle is the angle between the direction in which the optical signal of the third band is emitted from the second direction deflection device 42 and the first direction in the plane where the first direction and the second direction are located, and the absolute value of the fifth angle is greater than or equal to 0 degrees and less than 90 degrees, and the first angle, the third angle and the fifth angle are not equal to each other.

[0142] The first angle, the third angle and the fifth angle are not equal to each other, so that the light spots of the first band light signal, the second band light signal and the third band light signal are located at different positions of the light modulator 44 in the y-axis direction.

[0143] Exemplarily, the third direction deflection device 43 is further used to transmit the optical signal of the third wavelength band to the optical modulator 44 at a different sixth angle, where the sixth angle is the angle between the direction in which the optical signal of the third wavelength band is emitted from the third direction deflection device 43 and the first direction in the plane where the first direction and the third direction are located. The absolute value of the sixth angle is greater than or equal to 0 degrees and less than 90 degrees.

[0144] After the optical signal of the third band is transmitted to the optical modulator 44, the optical modulator 44 is used to modulate the optical signal of the third band to generate a modulated optical signal of the third band, and transmit the modulated optical signal of the third band to at least one second port of the wavelength selection switch 40 through the third direction deflection device 43, the second direction deflection device 42 and the wavelength combiner / splitter 41.

[0145] Among them, when the m optical signals are divided into a first band, a second band and a third band, the first band, the second band and the third band have no intersection, that is, each wavelength in the first band is different from each wavelength in the second band, each wavelength in the second band is different from each wavelength in the third band, and each wavelength in the first band is different from each wavelength in the third band.

[0146] For example, refer to Fig.15 As shown, compared with Figure 8 The second direction deflection device 42 shown, Fig.15 The second direction deflection device 42 shown further includes a deflection device 424. The deflection device 421, the deflection device 422 and the deflection device 424 are arranged along the x-axis direction. In the x-axis direction, the deflection device 424 is arranged on a side of the deflection device 422 away from the deflection device 421.

[0147] The deflection device 424 is used to transmit the optical signal of the third wavelength band to the third direction deflection device 43 at the fifth angle. Exemplarily, the position, size and placement of the deflection device 424 need to be determined according to the frequency range of the optical signal of the third wavelength band and the divergence of the optical signal, combined with the fifth angle, so that the deflection device 424 can receive the optical signal of the third wavelength band. The deflection device 424 includes any one of the following: a reflector, a MEMS micromirror, a grating, and a prism.

[0148] In some embodiments, the deflection device 421, the deflection device 422 and the deflection device 424 can be integrated in the same deflection device, the first part of the integrated deflection device is used to perform the function of the deflection device 421, the second part of the integrated deflection device is used to perform the function of the deflection device 422, and the fourth part of the integrated deflection device is used to perform the function of the deflection device 424. The first part, the second part and the fourth part are arranged along the x-axis direction in the integrated deflection device, and in the x-axis direction, the fourth part is arranged on the side of the second part away from the first part.

[0149] For example, refer to Fig.16 As shown, compared with Fig. 9 The third direction deflection device 43 shown, Fig.16 The third directional deflection device 43 shown further includes a deflection device 433. The deflection devices 431, 432 and 433 are arranged along the y-axis direction. In the y-axis direction, the deflection device 433 is arranged on a side of the deflection device 432 away from the deflection device 431.

[0150] The deflection device 433 is used to transmit the optical signal of the third band to the optical modulator 44 at different sixth angles. Exemplarily, the position, size and placement of the deflection device 433 need to be determined according to the frequency range of the optical signal of the third band and the divergence of the optical signal, combined with the fifth angle and the sixth angle, so that the deflection device 433 can receive the optical signal of the third band. The deflection device 433 includes any one of the following: a reflector, a MEMS micromirror, a grating, and a prism.

[0151] In some embodiments, the deflection device 431, the deflection device 432 and the deflection device 433 may be integrated in the same deflection device, the first part of the integrated deflection device is used to perform the function of the deflection device 431, the second part of the integrated deflection device is used to perform the function of the deflection device 432, and the third part of the integrated deflection device is used to perform the function of the deflection device 433. The first part, the second part and the third part are arranged along the y-axis direction in the integrated deflection device, and in the y-axis direction, the third part is arranged on the side of the second part away from the first part.

[0152] Exemplarily, the second direction deflection device 42 includes k deflection devices, the third direction deflection device 43 includes k deflection devices, and the s-th deflection device in the second direction deflection device 42 and the s-th deflection device in the third direction deflection device 43 act on the same band, then the wavelength selection switch 40 can divide the m optical signals into k bands, so that the optical modulator 44 can modulate the optical signals of k bands respectively, k is a positive integer greater than or equal to 2, s∈[1,k].

[0153] For example, refer to Fig.17 As shown, Fig.17 (a) in FIG. 17 is a schematic diagram of a port plane of the wavelength selective switch 40; (b) in FIG. 17 is a schematic diagram of a dispersion plane of the wavelength selective switch 40. Fig.17 In the figure, the second direction deflection device 42 includes a deflection device 421, a deflection device 422 and a deflection device 424, and the third direction deflection device 43 includes a deflection device 431, a deflection device 432 and a deflection device 433. The deflection device 421 and the deflection device 431 act on the optical signal of the first band, the deflection device 422 and the deflection device 432 act on the optical signal of the second band, and the deflection device 424 and the deflection device 433 act on the optical signal of the third band.

[0154] Reference Fig.17As shown, in the process of m optical signals being transmitted from the wavelength multiplexer / demultiplexer 41 to the optical modulator 44, the wavelength multiplexer / demultiplexer 41 receives the first optical signal, outputs m optical signals, and transmits the m optical signals to the second direction deflection device 42; specifically, the wavelength multiplexer / demultiplexer 41 transmits the m optical signals to the second direction deflection device 42 at different dispersion angles. The deflection device 421 in the second direction deflection device 42 transmits the optical signal of the first wavelength band to the deflection device 431 at an angle β3, where the angle β3 is the angle between the direction in which the optical signal of the first wavelength band is emitted from the deflection device 421 and the z-axis direction in the port plane, and the absolute value of the angle β3 is greater than 0 degrees and less than 90 degrees. The deflection device 422 in the second direction deflection device 42 transmits the optical signal of the second wavelength band to the deflection device 432 at an angle β4, where the angle β4 is the angle between the direction in which any optical signal of the second wavelength band is emitted from the deflection device 422 and the z-axis direction in the port plane, and the absolute value of the angle β4 is greater than 0 degrees and less than 90 degrees. The deflection device 424 in the second direction deflection device 42 transmits the optical signal of the third wavelength band to the deflection device 431 at an angle β5, where the angle β5 is the angle between the direction in which the optical signal of the third wavelength band is emitted from the deflection device 421 and the z-axis direction in the port plane, and the absolute value of the angle β5 is greater than 0 degrees and less than 90 degrees. Angle β3, angle β4 and angle β5 are different. The deflection device 431 in the third direction deflection device 43 transmits the optical signal of the first wavelength band to the optical modulator 44 at a different second angle, where the second angle is the angle between the direction in which the optical signal of the first wavelength band is emitted from the deflection device 431 and the z-axis direction in the dispersion plane. The deflection device 432 in the third direction deflection device 43 transmits the optical signal of the second wavelength band to the optical modulator 44 at a different fourth angle, where the fourth angle is the angle between the direction in which the optical signal of the second wavelength band is emitted from the deflection device 432 and the z-axis direction in the dispersion plane. The deflection device 433 in the third direction deflection device 43 transmits the optical signal of the third wavelength band to the optical modulator 44 at a different sixth angle, where the sixth angle is the angle between the direction in which the optical signal of the third wavelength band is emitted from the deflection device 433 and the z-axis direction in the dispersion plane.

[0155] For example, refer to Fig.17 As shown, the wavelength selective switch 40 may further include a lens 45 , a lens 46 , a lens 47 , a lens 48 , and a lens 49 .

[0156] The lens 46 is used to collimate the m optical signals in the y-axis direction (i.e., the second direction mentioned above). Fig.17As shown, the deflection device 421 transmits the light signal of the first band to the lens 46 at an angle β3. After the lens 46 collimates the light signal of the first band, the light signal of the first band can maintain the position Wy21 unchanged in the y-axis direction after being emitted from the lens 46 and is transmitted to the deflection device 431 and the lens 48; the deflection device 422 transmits the light signal of the second band to the lens 46 at an angle β4. After the lens 46 collimates the light signal of the second band, the light signal of the second band can maintain the position Wy22 unchanged in the y-axis direction after being emitted from the lens 46 and is transmitted to the deflection device 432 and the lens 48; the deflection device 424 transmits the light signal of the third band to the lens 46 at an angle β5. After the lens 46 collimates the light signal of the third band, the light signal of the third band can maintain the position Wy23 unchanged in the y-axis direction after being emitted from the lens 46 and is transmitted to the deflection device 432 and the lens 48.

[0157] When the optical signal of the second wavelength band is transmitted to the third directional deflection device 43, the position of the optical signal of the second wavelength band in the y-axis direction does not change and is always at position Wy21, so the position of the deflection device 431 in the third directional deflection device 43 on the y-axis covers position Wy21, so that the deflection device 431 can receive the optical signal of the first wavelength band. When the optical signal of the second wavelength band is transmitted to the third directional deflection device 43, the position of the optical signal of the second wavelength band in the y-axis direction does not change and is always at position Wy22, so the position of the deflection device 432 in the third directional deflection device 43 on the y-axis covers position Wy22, so that the deflection device 432 can receive the optical signal of the second wavelength band. When the optical signal of the third wavelength band is transmitted to the third directional deflection device 43, the position of the optical signal of the third wavelength band in the y-axis direction does not change and is always at position Wy23, so the position of the deflection device 433 in the third directional deflection device 43 on the y-axis covers position Wy23, so that the deflection device 433 can receive the optical signal of the third wavelength band.

[0158] The lens 46 is also used to focus the m optical signals in the x-axis direction (ie, the third direction mentioned above). Fig.17As shown, after the optical signals of the first wavelength band, the optical signals of the second wavelength band, and the optical signals of the third wavelength band are emitted through the lens 46, they will be focused on the same position Wx9 of the third directional deflection device 43 in the x-axis direction. Therefore, the position of the deflection device 431 in the third directional deflection device 43 in the x-axis direction needs to cover the position Wx9, the position of the deflection device 432 in the third directional deflection device 43 in the x-axis direction needs to cover the position Wx9, and the position of the deflection device 433 in the third directional deflection device 43 in the x-axis direction needs to cover the position Wx9. The deflection device 431 transmits the optical signals of the first wavelength band to the lens 47 through the lens 48 at different second angles. The deflection device 432 transmits the optical signals of the second wavelength band to the lens 47 through the lens 48 at different fourth angles. The deflection device 433 transmits each optical signal of the third wavelength band to the lens 47 through the lens 48 at different sixth angles.

[0159] The lens 48 is used to focus the m optical signals in the y-axis direction. Fig.17 As shown, lens 48 focuses the light signal of the first band in the y-axis direction, so that the light signal of the first band is focused from position Wy21 of lens 48 in the y-axis direction to position Wy24 of lens 47 in the y-axis direction, and then transmitted to position Wy27 of lens 49 in the y-axis direction; lens 48 focuses the light signal of the second band in the y-axis direction, so that the light signal of the second band is focused from position Wy22 of lens 48 in the y-axis direction to position Wy24 of lens 47 in the y-axis direction, and then transmitted to position Wy26 of lens 49 in the y-axis direction; lens 48 focuses the light signal of the third band in the y-axis direction, so that the light signal of the third band is focused from position Wy23 of lens 48 in the y-axis direction to position Wy24 of lens 47 in the y-axis direction, and then transmitted to position Wy25 of lens 49 in the y-axis direction.

[0160] The lens 47 is used to collimate the m optical signals in the x-axis direction. Fig.17 As shown, on the dispersion plane, the light signal of the first band remains in a constant position in the x-axis direction after being emitted from the lens 47, and is transmitted to the optical modulator 44 through the lens 49, and the light spot of each light signal of the first band is located at a different position of the light modulator 44 in the x-axis direction; the light signal of the second band remains in a constant position in the x-axis direction after being emitted from the lens 47, and is transmitted to the optical modulator 44 through the lens 49, and the light spot of each light signal of the second band is located at a different position of the light modulator 44 in the x-axis direction; the light signal of the third band remains in a constant position in the x-axis direction after being emitted from the lens 47, and is transmitted to the optical modulator 44 through the lens 49, and the light spot of the light signal of the third band is located at a different position of the light modulator 44 in the x-axis direction.

[0161] The lens 49 is used to collimate the m optical signals in the y-axis direction. Fig.17 As shown, the lens 49 is used to collimate the optical signal of the first band in the y-axis direction, so that each optical signal in the optical signal of the first band can maintain the position Wy27 unchanged in the y-axis direction after being emitted from the lens 49 and transmitted to the optical modulator 44, that is, the light spot of the optical signal of the first band is located at the position Wy27 of the optical modulator 44 in the y-axis direction; the lens 49 is used to collimate the optical signal of the second band in the y-axis direction, so that each optical signal in the optical signal of the second band can maintain the position Wy26 unchanged in the y-axis direction after being emitted from the lens 49 and transmitted to the optical modulator 44, that is, the light spot of the optical signal of the second band is located at the position Wy26 of the optical modulator 44 in the y-axis direction; the lens 49 is used to collimate the optical signal of the third band in the y-axis direction, so that each optical signal in the optical signal of the third band can maintain the position Wy25 unchanged in the y-axis direction after being emitted from the lens 49 and transmitted to the optical modulator 44, that is, the light spot of the optical signal of the third band is located at the position Wy25 of the optical modulator 44 in the y-axis direction.

[0162] Fig.17 The wavelength selective switch 40 shown can demultiplex m optical signals into three bands, so that the optical signals of the three bands are distributed at different positions of the optical modulator 44 along the y-axis direction, and the optical signal of any band is distributed at different positions of the optical modulator 44 along the x-axis direction, so that the optical modulator 44 can modulate the optical signals of the three bands respectively. By adjusting the second angle, the light spot of the optical signal of the first band can be close to the center of the optical modulator 44 in the x-axis direction; by adjusting the fourth angle, the light spot of the optical signal of the second band can be close to the center of the optical modulator 44 in the x-axis direction; by adjusting the sixth angle, the light spot of the optical signal of the third band can be close to the center of the optical modulator 44 in the x-axis direction.

[0163] For example, Fig.17 In the wavelength selective switch shown, along the z-axis direction, the second direction deflection device 42 is arranged at the focal plane of the lens 46, specifically, the second direction deflection device 42 is arranged at the focal plane of the lens 46 in the -z direction. The third direction deflection device 43 is arranged at the focal plane of the lens 46, specifically, the third direction deflection device 43 is arranged at the focal plane of the lens 46 in the z direction. The third direction deflection device 43 is also arranged at the focal plane of the lens 47, specifically, the third direction deflection device 43 is arranged at the focal plane of the lens 47 in the -z direction. The focal length of the lens 47 is greater than the focal length of the lens 46. Exemplarily, when the focal length of the lens 47 is f1, the focal length of the lens 46 is f2, and f1 is greater than f2, the size of the spot of any optical signal in the x-axis direction will be magnified, and the magnification is f2 / f1.

[0164] For example, refer to Fig.17 As shown, along the z-axis direction, the wavelength combiner / demultiplexer 41 is arranged at the focal plane of the lens 45 in the -z direction, the second direction deflection device 42 is arranged at the focal plane of the lens 45 in the z direction, and the focal plane of the lens 45 in the z direction coincides with the focal plane of the lens 46 in the -z direction; the third direction deflection device 43 is arranged at the focal plane of the lens 48 in the -z direction, the lens 47 is arranged at the focal plane of the lens 48 in the z direction, and the focal length of the lens 48 is equal to half of the focal length of the lens 47; the lens 47 is arranged at the focal plane of the lens 49 in the -z direction, the optical modulator 44 is arranged at the focal plane of the lens 49 in the z direction, and the focal plane of the lens 49 in the -z direction coincides with the focal plane of the lens 48 in the z direction.

[0165] For example, Fig.17 A deflection device 423 may also be provided between the deflection device 421 and the deflection device 422. No further details are given here.

[0166] For example, Fig.17 A deflection device 425 may also be provided between the deflection device 422 and the deflection device 423. Fig.18 As shown, the embodiment of the present application provides another wavelength selection switch 40, Fig.18 (a) is specifically a port plane diagram of the wavelength selective switch 40; Fig.18 (b) is specifically a schematic diagram of the dispersion plane of the wavelength selective switch 40.

[0167] Reference Fig.18 As shown, compared to Fig.17 The wavelength selective switch 40 shown, Fig.18 The second direction deflection device 42 in the wavelength selective switch shown further includes a deflection device 425 disposed along the x-axis direction between the deflection device 422 and the deflection device 424. The deflection device 425 is used to transmit the received optical signal to the third direction deflection device 43 at a third angle or a fifth angle.

[0168] In one example, the deflection device 425 deflects the received optical signal at a third angle ( Fig.17 4) is transmitted to the third directional deflection device 43, then the deflection device 425 specifically converts the received optical signal into a partial optical signal of the second band. Exemplarily, when the frequency range covered by the deflection device 422 is equal to the frequency range covered by the deflection device 424, the frequency range of the second band is equal to the sum of the frequency range covered by the deflection device 422 and the frequency range covered by the deflection device 425, thereby making the frequency range of the second band greater than the frequency range of the third band. In another example, the deflection device 425 converts the received optical signal into a partial optical signal of the second band at a fifth angle ( Fig.17β5) shown in the figure is transmitted to the third directional deflection device 43, then the deflection device 425 will specifically convert the received optical signal into a partial optical signal of the third band. Exemplarily, when the frequency range covered by the deflection device 422 is equal to the frequency range covered by the deflection device 424, the frequency range of the third band is equal to the sum of the frequency range covered by the deflection device 425 and the frequency range covered by the deflection device 424, thereby making the frequency range of the third band larger than the frequency range of the second band.

[0169] Exemplarily, the deflection device 425 includes any one of the following: a reflector, a MEMS micromirror, a grating, and a prism.

[0170] In some embodiments, the deflection device 421, the deflection device 422, the deflection device 425 and the deflection device 424 may be integrated in the same deflection device, the first part of the integrated deflection device is used to perform the function of the deflection device 421, the second part of the integrated deflection device is used to perform the function of the deflection device 422, the fourth part of the integrated deflection device is used to perform the function of the deflection device 424, and the fifth part of the integrated deflection device is used to perform the function of the deflection device 425. The first part, the second part, the fifth part and the fourth part are arranged along the x-axis direction in the integrated deflection device, and along the x-axis direction, the fourth part is arranged on the side of the second part away from the first part, and the fifth part is located between the second part and the fourth part.

[0171] For example, refer to Fig.18 As shown, the wavelength selective switch 40 may further include a lens 45, a lens 46, a lens 47, a lens 48 and a lens 49. When the deflection device 425 transmits the received optical signal to the third direction deflection device 43 at a third angle, the effect of any one of the lenses 45, 46, 47, 48 and 49 on the optical signal received by the deflection device 425 is referred to the effect of any one of the above lenses on the optical signal of the second wavelength band, which is not described in detail here. When the deflection device 425 transmits the received optical signal to the third direction deflection device 43 at a fifth angle, the effect of any one of the lenses 45, 46, 47, 48 and 49 on the optical signal received by the deflection device 425 is referred to the effect of any one of the above lenses on the optical signal of the third wavelength band, which is not described in detail here.

[0172] in, Fig.12 , Fig.17 as well as Fig.18 The optical modulator 44 in the wavelength selective switch 40 shown in the figure modulates the m optical signals to generate m modulated optical signals. The process of transmitting the m modulated optical signals to the second port of the wavelength selective switch 40 can be referred to as Fig.11 As shown, no further description is given here.

[0173] For example, Fig.10 , Fig.12 , Fig.17 as well as Fig.18 The wavelength selective switch 40 shown may specifically include a first port and multiple second ports, wherein the first port is used to receive a first optical signal, and the second port is used to output a modulated optical signal or a combined optical signal. The wavelength selective switch 40 is called a 1*N wavelength selective switch, where the number of the second ports is N, and N is a positive integer greater than 1.

[0174] In some other embodiments, the wavelength selective switch 40 may further include multiple first ports, and the wavelength selective switch 40 is called an M*N wavelength selective switch, wherein M is the number of first ports, M is a positive integer greater than 1, and N is the number of second ports, N is a positive integer greater than 1.

[0175] Exemplarily, when the wavelength selective switch is specifically an M*N wavelength selective switch, in one embodiment, each of the M first ports may correspond to a wavelength combiner / demultiplexer 41, a second direction deflection device 42, a third direction deflection device 43, and an optical modulator 44, and may correspond to a lens 45, a lens 46, a lens 47, a lens 48, and a lens 49, respectively. The arrangement of each device may refer to Fig.10 or Fig.12 or Fig.17 or Fig.18 Among them, M wavelength combiners and demultiplexers 41 can be integrated, and M optical modulators 44 can also be integrated.

[0176] Exemplarily, when the wavelength selective switch is specifically an M*N wavelength selective switch, in another embodiment, referring to Fig.19 As shown, the M first ports in the wavelength selective switch share a wavelength multiplexing / demultiplexing device 41, a second direction deflection device 42, a third direction deflection device 43 and an optical modulator 44, and share lenses 45, 46, 47, 48 and 49. The specific structures of the second direction deflection device 42 and the third direction deflection device 43 can be referred to. Fig.10 or Fig.12 or Fig.17 or Fig.18 Specifically, Fig.19 The specific structures of the second direction deflection device 42 and the third direction deflection device 43 are as follows: Fig.10 same.

[0177] For example, Fig.19 The two first ports are arranged along the y-axis direction and have the same position in the x-axis direction. Fig.19 (a) is specifically a port plane diagram of the wavelength selective switch 40; Fig.19 (b) is a schematic diagram of the dispersion plane of the wavelength selective switch 40. Since the two first ports are arranged along the y-axis direction and have the same position in the x-axis direction, in the dispersion plane, the first optical signal input from the first first port is Fig.10 The transmission path of the optical signal shown in (b) is transmitted to the optical modulator 44, and the second optical signal input from the second first port is transmitted according to Fig.10 The optical signal is transmitted to the optical modulator 44 via the transmission path shown in (b) in FIG.

[0178] In the port plane, refer to Fig.19 As shown in (a), the first optical signal input from the first first port is transmitted to the wavelength combiner / demultiplexer 41 at the position Wy1 in the y-axis direction, and then transmitted to the second direction deflection device at the position Wy1 in the y-axis direction through the lens 45 at the position Wy1 in the y-axis direction, and then according to Fig.10 The optical signal is transmitted to the optical modulator 44 via the transmission path shown in (a) in FIG.

[0179] The second optical signal inputted from the second first port is transmitted to the wavelength multiplexer / demultiplexer 41 at position Wy31 in the y-axis direction, and then transmitted to the second direction deflection device 42 at position Wy31 in the y-axis direction through the lens 45 at position Wy31 in the y-axis direction, and position Wy31 is above position Wy1. The deflection device 421 in the second direction deflection device 42 also covers position Wy31 in the y-axis direction, and the deflection device 422 in the second direction deflection device 42 also covers position Wy31 in the y-axis direction. Subsequently, the deflection device 421 transmits the optical signal of the first wavelength band in the second optical signal to the lens 46 at position Wy32 in the y-axis direction at an angle β1, and position Wy32 is above position Wy2; the deflection device 422 transmits the optical signal of the second wavelength band in the second optical signal to the lens 46 at position Wy33 in the y-axis direction at an angle β2, and position Wy33 is between position Wy2 and position Wy3. Lens 46 collides m optical signals in the second optical signal in the y-axis direction, so that the optical signal of the first band in the second optical signal is transmitted to the position Wy34 of the lens 48 in the y-axis direction through the position Wy2 of the deflection device 431 in the y-axis direction, and the optical signal of the second band in the second optical signal is transmitted to the position Wy35 of the lens 48 in the y-axis direction through the position Wy3 of the deflection device 431 in the y-axis direction. Position Wy34 is between position Wy2 and position Wy3, and position Wy35 is below position Wy3. Lens 48 focuses the m optical signals in the second optical signal in the y-axis direction, so that the optical signal of the first wavelength band in the second optical signal is transmitted to the position Wy37 of lens 49 in the y-axis direction through the position Wy36 of lens 47 in the y-axis direction, and the optical signal of the second wavelength band in the second optical signal is transmitted to the position Wy38 of lens 49 in the y-axis direction through the position Wy36 of lens 47 in the y-axis direction, position Wy36 is below position Wy4, position Wy37 is between position Wy5 and position Wy6, and position Wy38 is below position Wy6. Lens 49 is used to collimate the m optical signals in the second optical signal in the y-axis direction, so that each optical signal in the first wavelength band in the second optical signal keeps the position Wy37 unchanged in the y-axis direction after being emitted from lens 49 and is transmitted to optical modulator 44, and each optical signal in the second wavelength band in the second optical signal keeps the position Wy38 unchanged in the y-axis direction after being emitted from lens 49 and is transmitted to optical modulator 44.

[0180] Exemplarily, in the wavelength combiner / demultiplexer 41, along the y-axis direction, the second optical signal is above the first optical signal, and on the optical modulator 44, from top to bottom along the y-axis direction are the first band of the first optical signal, the first band of the second optical signal, the second band of the first optical signal, and the second band of the second optical signal.

[0181] Exemplarily, when the wavelength selective switch is specifically an M*N wavelength selective switch, in another embodiment, referring to Fig. 20 As shown, compared to Fig.19 The wavelength selective switch 40 shown, Fig. 20 In the wavelength selective switch 40 shown, the two first ports are arranged along the y-axis direction, and the positions of the two first ports in the x-axis direction are also different. Fig. 20 (a) is specifically a port plane diagram of the wavelength selective switch 40; Fig. 20 (b) is a schematic diagram of the dispersion plane of the wavelength selective switch 40. The two first ports are arranged along the y-axis direction, and the first optical signal input to the first first port is arranged according to Fig.19 The transmission path of the first optical signal shown in (a) is transmitted to the optical modulator 44, and the second optical signal input from the second first port is transmitted according to Fig.19 The second optical signal is transmitted to the optical modulator 44 via the transmission path shown in (a) in FIG.

[0182] In the dispersion plane, refer to Fig. 20 As shown in (a), the first optical signal input from the first first port is transmitted to the wavelength multiplexing / demultiplexing device 41 at position Wx0 in the x-axis direction, and then Fig.10 The optical signal is transmitted to the optical modulator 44 via the transmission path shown in (b) in FIG.

[0183] The second optical signal inputted from the second first port is transmitted to the wavelength combiner / demultiplexer 41 at position Wx7 in the x-axis direction. The wavelength combiner / demultiplexer demultiplexes the second optical signal into m optical signals, and transmits the m optical signals to different positions of the lens 45 according to different dispersion angles. The lens 45 is used to collimate the m optical signals in the second optical signal, and the transmission directions of the collimated m optical signals from the lens 45 to the lens 46 are parallel to each other, but not parallel to the z-axis, and the optical signals of the first wavelength band in the second optical signal are transmitted to the lens 46 through the deflection device 421, and the optical signals of the second wavelength band in the second optical signal are transmitted to the lens 46 through the deflection device 422. The lens 46 is used to focus the m optical signals in the second optical signal, wherein the optical signals of the first wavelength band and the optical signals of the second wavelength band in the second optical signal are focused on the same position Wx8 in the x-axis direction of the third direction deflection device 43 after being emitted through the lens 46, and the position Wx8 is below the position Wx1. The deflection device 431 in the third directional deflection device 43 also covers the position Wx8 in the x-axis direction, and the deflection device 432 in the third directional deflection device 43 also covers the position Wx8 in the x-axis direction. The deflection device 431 transmits each optical signal of the first wavelength band in the second optical signal to the lens 47 at unequal angles; the deflection device 432 transmits each optical signal of the second wavelength band in the second optical signal to the lens 47 at unequal angles. The lens 47 is used to collimate the m optical signals in the second optical signal in the x-axis direction, so that each optical signal in the first wavelength band in the second optical signal remains unchanged in the x-axis direction after being emitted from the lens 47 and is transmitted to the optical modulator 44 through the lens 49, and each optical signal in the second wavelength band in the second optical signal remains unchanged in the x-axis direction after being emitted from the lens 47 and is transmitted to the optical modulator 44 through the lens 49.

[0184] For example, Fig.19 and Fig. 20 In the wavelength selective switch shown, when the wavelength selective switch includes M first ports, the M first ports are located at different positions in the y-axis direction, and the M first ports are located at the same or different positions in the x-axis direction.

[0185] Although the present invention has been described in conjunction with specific features and embodiments thereof, it is apparent that various modifications and combinations may be made thereto without departing from the spirit and scope of the present invention. Accordingly, this specification and the accompanying drawings are merely exemplary illustrations of the present invention as defined by the appended claims and are deemed to cover any and all modifications, variations, combinations or equivalents within the scope of the present invention. Obviously, those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, the present invention is intended to include such modifications and variations if they fall within the scope of the claims of the present invention and their equivalents.

Claims

1. A wavelength selective switch, characterized in that: include: A wavelength combiner / demultiplexer, a second direction deflection device and an optical modulator; The wavelength combiner / demultiplexer is used to receive the first optical signal input by the first port of the wavelength selective switch, output m optical signals, and transmit the m optical signals to the second direction deflection device, where m is a positive integer greater than or equal to 1; The second direction deflection device is used to emit the optical signal of the first wavelength band among the m optical signals to the optical modulator at a first angle, wherein the first angle is an angle between the direction in which the optical signal of the first wavelength band is emitted from the second direction deflection device and the first direction in a plane where the first direction and the second direction are located; the first direction is the optical transmission direction of the wavelength selective switch, and the second direction is the port direction of the wavelength selective switch, wherein the absolute value of the first angle is greater than or equal to 0 degrees and less than 90 degrees; The optical modulator is used to modulate the optical signal of the first wavelength band to generate a modulated optical signal of the first wavelength band.

2. The wavelength selective switch according to claim 1, characterized in that: The wavelength selective switch further comprises a third direction deflection device disposed between the second direction deflection device and the optical modulator along the first direction; The third directional deflection device is used to emit the optical signal of the first band to the optical modulator at a different second angle, wherein the second angle is an angle between the direction in which the optical signal of the first band is emitted from the third directional deflection device and the first direction in a plane where the first direction and the third direction are located, and the third direction is the dispersion direction of the wavelength selection switch, wherein the absolute value of the second angle is greater than or equal to 0 degrees and less than 90 degrees.

3. The wavelength selective switch according to claim 2, characterized in that: The second direction deflection device is further used to transmit the optical signal of the second wavelength band among the m optical signals to the third direction deflection device at a third angle, wherein the third angle is an angle between a direction in which the optical signal of the second wavelength band is emitted from the second direction deflection device and the first direction in a plane where the first direction and the second direction are located, wherein an absolute value of the third angle is greater than or equal to 0 degrees and less than 90 degrees, the first angle is different from the third angle, and m is a positive integer greater than or equal to 2; The third directional deflection device is used for transmitting the optical signal of the second wavelength band to the optical modulator at a different fourth angle, wherein the fourth angle is an angle between a direction in which the optical signal of the second wavelength band is emitted from the third directional deflection device and the first direction in a plane where the first direction and the third direction are located, wherein an absolute value of the fourth angle is greater than or equal to 0 degree and less than 90 degrees; The optical modulator is used to modulate the optical signal in the second wavelength band to generate a modulated optical signal in the second wavelength band.

4. The wavelength selective switch according to claim 3, characterized in that: The second-direction deflection device comprises a first deflection device and a second deflection device, and the first deflection device and the second deflection device are arranged along the third direction; The first deflection device is used to transmit the optical signal of the first wavelength band to the third deflection device at the first angle; The second deflection device is used to transmit the optical signal of the second wavelength band to the third deflection device at the third angle.

5. The wavelength selective switch according to claim 3, characterized in that: The third direction deflection device comprises a third deflection device and a fourth deflection device, and the third deflection device and the fourth deflection device are arranged along the second direction; The third deflection device is used to transmit the optical signal of the first wavelength band to the optical modulator at different second angles; The fourth deflection device is used to transmit the optical signal of the second wavelength band to the optical modulator at a different fourth angle.

6. The wavelength selective switch according to claim 4, characterized in that: The second direction deflection device further comprises a fifth deflection device disposed between the first deflection device and the second deflection device along the third direction; The fifth deflection device is used to transmit the received optical signal to the third direction deflection device at the first angle or the third angle.

7. The wavelength selective switch according to any one of claims 2 to 6, characterized in that: The third directional deflection device is further used to transmit the modulated optical signal of the first wavelength band to the second directional deflection device; The second direction deflection device is also used to transmit the modulated optical signal of the first wavelength band to the wavelength combiner and demultiplexer; The wavelength multiplexer / demultiplexer is used to transmit the modulated optical signal of the first wavelength band to at least one second port of the wavelength selective switch.

8. The wavelength selective switch according to any one of claims 2 to 7, characterized in that: The wavelength selective switch further comprises a first lens, wherein the first lens is arranged between the second direction deflection device and the third direction deflection device; The first lens is used to collimate the m optical signals in the second direction and focus the m optical signals in the third direction.

9. The wavelength selective switch according to claim 8, characterized in that: The wavelength selective switch further comprises a second lens, wherein the second lens is arranged between the third direction deflection device and the optical modulator; The second lens is used to collimate the m optical signals in the third direction.

10. The wavelength selective switch according to any one of claims 2 to 9, characterized in that: The wavelength selective switch further comprises a third lens and a fourth lens, and along the first direction, the third lens and the fourth lens are arranged between the third direction deflection device and the optical modulator; The third lens is used to focus the m optical signals in the second direction; The fourth lens is used to collimate the m optical signals in the second direction.

11. The wavelength selective switch according to any one of claims 2 to 10, characterized in that: The wavelength selective switch further comprises a fifth lens, and the fifth lens is arranged between the wavelength combining and decomposing device and the second direction deflection device; The fifth lens is used to collimate the m optical signals in the third direction.

12. The wavelength selective switch according to claim 9, characterized in that: The second direction deflection device is arranged at the focal plane of the first lens; the third direction deflection device is arranged at the focal plane of the first lens; the third direction deflection device is also arranged at the focal plane of the second lens; the focal length of the second lens is greater than the focal length of the first lens.

13. The wavelength selective switch according to any one of claims 1 to 12, characterized in that: The first port of the wavelength selective switch and the second port of the wavelength selective switch are arranged along the second direction.

14. The wavelength selective switch according to any one of claims 1 to 13, characterized in that: The first port of the wavelength selective switch and the second port of the wavelength selective switch are arranged in an array in a plane where the second direction and the third direction are located.

15. The wavelength selective switch according to claim 13, characterized in that: The phase change direction of the optical modulator is parallel to the second direction.

16. The wavelength selective switch according to claim 4, characterized in that: The first deflection device includes any one of the following: a reflector, a micro-electromechanical system micro-mirror, a grating, and a prism; The second deflection device includes any one of the following: a reflector, a micro-electromechanical system micro-mirror, a grating, and a prism.

17. The wavelength selective switch according to claim 5, characterized in that: The third deflection device includes any one of the following: a reflector, a micro-electromechanical system micro-mirror, a grating, and a prism; The fourth deflection device includes any one of the following: a reflector, a micro-electromechanical system micro-mirror, a grating, and a prism.

18. An optical switching device, characterized in that: Comprising a wavelength selective switch as claimed in any one of claims 1 to 17.

19. An optical network system, characterized in that: A plurality of optical switching devices as claimed in claim 18 comprising optical fiber connections.

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