WO2023125516A1

WO2023125516A1 - Wavelength selective switch

Info

Publication number: WO2023125516A1
Application number: PCT/CN2022/142271
Authority: WO
Inventors: 贾伟; 邓宁; 吴云飞
Original assignee: 华为技术有限公司
Priority date: 2021-12-29
Filing date: 2022-12-27
Publication date: 2023-07-06
Also published as: CN116413861A

Abstract

A wavelength selective switch. Signal light input ports (10) and a false light input port (20) are distributed in a first direction. A first dispersive element (30) is used for decomposing, in a second direction, signal light from the signal light input ports (10) into multiple beams of sub-wavelength signal light, and decomposing, in the second direction, false light from the false light input port (20) into multiple beams of sub-wavelength false light, the second direction being perpendicular to the first direction. A first optical switch array (40) is used for adjusting a deflection direction of the multiple beams of sub-wavelength signal light, and sub-wavelength signal light and sub-wavelength false light of the same wavelength have the same incident position on a second optical switch array (50). The second optical switch array (50) is used for adjusting a deflection direction of incident light at each incident position, so that the sub-wavelength signal light or sub-wavelength false light of each wavelength is transmitted to an output port (70). The second optical switch array (50) selects one of the sub-wavelength signal light and sub-wavelength false light of each wavelength to fill a channel of leaky-wave signal light, thereby maintaining a full-wave state, and improving the stability of signal transmission.

Description

A wavelength selective switch

This application claims the priority of a Chinese patent application with application number 202111640047.0 and application title "A Wavelength Selective Switch" filed with the State Intellectual Property Office of China on December 29, 2021, the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the field of optical communication, in particular to a wavelength selective switch.

Background technique

With the rapid growth of data traffic in the network, the demand for network transmission capacity is also increasing. Generally, the network transmission capacity can be improved by increasing the operating frequency spectrum width (number of channels) of the channel, for example, extending the original C-band to C-band and L-band.

However, as the spectral width of the channel increases, there is a stimulated Raman scattering (Stimulated Raman Scattering, SRS) effect in the multi-wavelength transmission system link, and the transmission power of the short-wave band will be transferred to the transmission power of the long-wave band. The power transfer between multi-wavelength signals due to the SRS effect is stable when there is no steady state of up-wave or down-wave occurring. When adding or dropping waves occurs, the number, distribution, and position of multi-wavelength signals will change randomly, resulting in complex changes in the SRS effect, which may exceed the system's ability to withstand, thereby reducing the stability of signal transmission.

Contents of the invention

An embodiment of the present application provides a wavelength selective switch (Wavelength Selective Switch, WSS), which is used to improve the stability of signal transmission.

In a first aspect, the present application provides a wavelength selective switch. The wavelength selective switch includes: a signal light input port, a false light input port, an output port, a first dispersive element, a second dispersive element, a first optical switch array, a second optical switch array, a first mirror group, and a second mirror group and third lens group. Wherein, the signal light input ports and the dummy light input ports are distributed along the first direction.

The first dispersion element is used to decompose the signal light from the signal light input port into multiple sub-wavelength signal lights in the second direction, and decompose the spurious light from the spurious light input port into multiple sub-wavelength spurious lights in the second direction . Wherein, the second direction is perpendicular to the first direction. The first lens group is used for collimating multiple sub-wavelength signal lights and multiple sub-wavelength false lights in the second direction. The first optical switch array is used to adjust the deflection directions of the multiple sub-wavelength signal lights from the first lens. The second mirror group is used to guide the sub-wavelength signal light from the first optical switch array and the sub-wavelength dummy light from the first mirror group to the second optical switch array. Wherein, the incident positions of sub-wavelength signal light and sub-wavelength dummy light of the same wavelength on the second optical switch array are the same. The second optical switch array is used to adjust the deflection direction of the incident light at each incident position, so that the sub-wavelength signal light or sub-wavelength dummy light of each wavelength is transmitted to the output port. The third mirror group is used for converging the sub-wavelength signal light and/or the sub-wavelength dummy light from the second optical switch array in the second direction. The second dispersion element is used for multiplexing the sub-wavelength signal light and/or sub-wavelength false light from the third mirror group, and directing the multiplexed light to the output port.

In this embodiment, even if the signal light of a certain wavelength drops during transmission, the false light of this wavelength can be selected by the second optical switch array to upload the false light to fill the channel of the wave-dropped signal light, In this way, the full wave state is maintained, the SRS effect is stable, and the stability of signal transmission is improved. In addition, the second optical switch array only needs to switch in two output directions, the adjustment speed is faster, and the fast uploading of signal light and false light can be realized.

In some possible implementations, if the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the second optical switch array is greater than or equal to a preset value, the first sub-wavelength incident at the first incident position The long holiday light is transmitted to the output port through the second optical switch array. If the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the second optical switch array is less than a preset value, the first sub-wavelength signal light is transmitted to the output port through the second optical switch array.

In this embodiment, by detecting the energy of the incident sub-wavelength signal light on the second optical switch array, the sub-wavelength signal light and sub-wavelength false light of the same wavelength can be reasonably selected, so that the normally transmitted sub-wavelength signal light can still To continue the transmission, for the sub-wavelength signal light that is not normally transmitted, sub-wavelength false light can be uploaded to ensure that the light after passing through the WSS is in a full-wave state.

In some possible implementation manners, the multiple sub-wavelength false lights from the first optical group are transmitted to the second optical group through the first optical switch array. That is to say, the first optical switch array can also adjust the deflection direction of the incident sub-wavelength false light, which expands the application scenarios of this solution.

In some possible implementation manners, the first optical switch array is also used to adjust the deflection direction of the second sub-wavelength false light from the first mirror group. Wherein, the second sub-wavelength false light after the deflection direction is adjusted is not guided to the second optical switch array. The second optical switch array is used to adjust the deflection direction of the second sub-wavelength signal light from the second mirror group, so as to attenuate the energy transmitted to the output port by the second sub-wavelength signal light. Wherein, the wavelength of the second sub-wavelength dummy light is the same as that of the second sub-wavelength signal light. In this embodiment, before the second sub-wavelength signal light is attenuated by the second optical switch array, the second sub-wavelength false light needs to be blocked by the first optical switch array to avoid the second sub-wavelength signal light When the light is attenuated, the false light of the second sub-wavelength is enhanced to ensure the attenuation effect.

In some possible implementation manners, the signal light of the third sub-wavelength is not guided to the second optical switch array after the deflection direction is adjusted by the first optical switch array. The second optical switch array is used to adjust the deflection direction of the third sub-wavelength false light from the second mirror group, so as to attenuate the energy transmitted to the output port by the third sub-wavelength false light. Wherein, the third sub-wavelength dummy light has the same wavelength as the third sub-wavelength signal light. In this embodiment, before attenuating the false light of the third sub-wavelength by the second optical switch array, the signal light of the third sub-wavelength needs to be blocked by the first optical switch array, so as to avoid false light of the third sub-wavelength When the light is attenuated, the third sub-wavelength signal light is enhanced at the same time, which ensures the attenuation effect.

In some possible implementation manners, the WSS further includes a fourth mirror group and a fifth mirror group. The fourth mirror group is used to collimate and shape the signal light from the signal light input port before guiding it to the first dispersion element, and to collimate and shape the false light from the false light input port before guiding it to the first dispersion element. Dispersion element. The fifth mirror group is used to collimate and shape the combined light from the second dispersive element before guiding it to the output port. Through the above method, the light can also be collimated and beam shaped before the dispersion and after the multiplexing, which enhances the practicability of the solution.

In some possible implementation manners, the first lens group includes a first lens, a second lens and a third lens. The first lens is used to transmit the multiple sub-wavelength signal lights from the first dispersive element, or refract the multiple sub-wavelength signal lights from the first dispersive element in the first direction. The second lens is used to transmit the multiple sub-wavelength false lights from the first dispersion element, or refract the multiple sub-wavelength false lights from the first dispersion element in the first direction. The third lens is used for collimating the multiple sub-wavelength signal lights from the first lens in the second direction, and collimating the multiple sub-wavelength false lights from the second lens. Through the foregoing manner, a specific implementation manner of the first mirror group is provided, which improves the feasibility of the solution. In a scene with multiple signal light input ports, multiple signal lights can be focused to the same position of the first optical switch array in the first direction through the first lens, and false light can be directed to the first light through the second lens Other positions of the switch array in the first direction.

In some possible implementation manners, the second lens group includes a fourth lens, a fifth lens and a sixth lens. The fourth lens is used for converging the sub-wavelength signal light from the first optical switch array in the second direction, and converging the sub-wavelength false light from the first mirror group. The fifth lens is used for converging the sub-wavelength signal light and the sub-wavelength false light from the fourth lens in the first direction. The sixth lens is used to collimate the sub-wavelength signal light and the sub-wavelength false light from the fifth lens in the second direction and direct them to the second optical switch array. Through the foregoing manner, a specific implementation manner of the second mirror group is provided, which improves the feasibility of the solution.

In some possible implementation manners, the third lens group includes a seventh lens and an eighth lens. The seventh lens is used for converging the sub-wavelength signal light from the second optical switch array in the second direction, and converging the sub-wavelength false light from the second optical switch array. The eighth lens is used for beam shaping the sub-wavelength signal light and sub-wavelength dummy light from the seventh lens. Through the foregoing manner, a specific implementation manner of the third lens group is provided, which improves the feasibility of the solution.

In some possible implementation manners, the first optical switch array is liquid crystal on silicon (Liquid Crystal on Silicon, LCOS), and the second optical switch array is digital light processor (Digital Light Processer, DLP). It should be understood that the LCOS can support the adjustment of any deflection direction, and has wider application scenarios. DLP usually only supports two deflection directions, which can realize polarization direction switching more quickly.

In some possible implementations, the WSS also includes a controller, and the first optical switch array and the second optical switch array are controlled by the controller, so as to control the first optical switch array to perform wavelength selection according to actual conditions, and to control The second optical switch array selects one of the sub-wavelength signal light and the sub-wavelength dummy light of the same wavelength.

In a second aspect, the present application provides a wavelength selective switch. The wavelength selective switch includes: a signal light input port, a dummy light input port, an output port, a first dispersion element, a second dispersion element, an optical switch array, a first polarization conversion device, a second polarization conversion device, a polarization beam combiner, A polarization conversion array, a polarization splitter, a first mirror group, a second mirror group and a third mirror group. Wherein, the signal light input ports and the dummy light input ports are distributed along the first direction.

The first polarization conversion device is used for converting the signal light from the signal light input port into a first polarization state. The second polarization conversion device is used for converting the dummy light from the dummy light input port into a second polarization state. Wherein, the first polarization state and the second polarization state are orthogonal to each other. The first dispersion element is used to decompose the signal light from the first polarization conversion device into multiple sub-wavelength signal lights in the second direction, and decompose the spurious light from the second polarization conversion device into multiple sub-wavelengths in the second direction Holiday light. Wherein, the second direction is perpendicular to the first direction. The first lens group is used for collimating multiple sub-wavelength signal lights and multiple sub-wavelength false lights in the second direction. The optical switch array is used to adjust the deflection directions of the multiple sub-wavelength signal lights from the first lens. The second mirror group is used to guide the sub-wavelength signal light from the optical switch array and the sub-wavelength false light from the first mirror group to the polarization beam combiner. The polarization beam combiner is used to combine the sub-wavelength signal light and sub-wavelength dummy light from the second mirror group, and guide the combined sub-wavelength signal light and sub-wavelength dummy light to the polarization conversion array. Wherein, the incident positions of sub-wavelength signal light and sub-wavelength dummy light of the same wavelength on the polarization conversion array are the same. The polarization conversion array is used to adjust the polarization state of the incident light at each incident position, so as to select the polarization state of each sub-wavelength signal light and the polarization state of each sub-wavelength false light output from the polarization conversion array. Wherein, the sub-wavelength signal light and the sub-wavelength dummy light of the same wavelength output from the polarization conversion array have different polarization states. The polarization splitter is used to transmit the sub-wavelength signal light and/or sub-wavelength dummy light with the first polarization state from the polarization conversion array, and reflect the sub-wavelength signal light and/or sub-wavelength with the second polarization state from the polarization conversion array Holiday light. The third mirror group is used for converging the sub-wavelength signal light and/or the sub-wavelength false light transmitted by the polarization splitter in the second direction. The second dispersion element is used for multiplexing the sub-wavelength signal light and/or sub-wavelength false light from the third mirror group, and directing the multiplexed light to the output port.

In this embodiment, even if the signal light of a certain wavelength is dropped during the transmission process, the false light of this wavelength can be selected through the polarization conversion array and the deflection splitter to upload the false light to fill the space of the wave-dropped signal light. Channel, so as to maintain a full wave state, the SRS effect is stable, and the stability of signal transmission is improved. In addition, the use of the polarization conversion array only needs to convert the incident light between two polarization states, the adjustment speed is faster, and the signal light and false light can be uploaded quickly.

In some possible implementations, if the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the polarization conversion array is greater than or equal to a preset value, the first sub-wavelength false light incident at the first incident position After passing through the polarization conversion array, it has a first polarization state, and the first sub-wavelength signal light has a second polarization state after passing through the polarization conversion array. If the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the second optical switch array is less than the preset value, the first sub-wavelength false light has a second polarization state after passing through the polarization conversion array, and the first sub-wavelength The signal light has a first polarization state after passing through the polarization conversion array.

In this embodiment, by detecting the energy of the sub-wavelength signal light incident on the polarization conversion array, the sub-wavelength signal light and sub-wavelength false light of the same wavelength can be reasonably selected, so that the normally transmitted sub-wavelength signal light can still continue to transmit , for abnormally transmitted sub-wavelength signal light, sub-wavelength false light can be uploaded to ensure that the light after passing through the WSS is in a full-wave state.

In some possible implementation manners, the multiple sub-wavelength false lights from the first mirror group are transmitted to the second mirror group through the optical switch array. That is to say, the optical switch array can also adjust the deflection direction of the incident sub-wavelength false light, which expands the application scenarios of this solution.

In some possible implementations, the optical switch array is also used to adjust the deflection direction of the second sub-wavelength false light from the first mirror group, wherein the second sub-wavelength false light after the deflection direction is adjusted is not guided to the polarization beam combiner . The polarization conversion array is used to adjust the polarization state of the second sub-wavelength signal light from the polarization beam combiner, so as to attenuate the energy of the second sub-wavelength signal light transmitted to the output port. Wherein, the wavelength of the second sub-wavelength dummy light is the same as that of the second sub-wavelength signal light. In this embodiment, before the second sub-wavelength signal light is attenuated by the polarization conversion array, the second sub-wavelength false light needs to be blocked by the optical switch array to avoid the second sub-wavelength signal light being attenuated. At the same time, the false light of the second sub-wavelength is enhanced to ensure the attenuation effect.

In some possible implementation manners, the signal light of the third sub-wavelength is not guided to the polarization beam combiner after the deflection direction is adjusted by the optical switch array. The polarization conversion array is used to adjust the polarization state of the third sub-wavelength dummy light from the polarization beam combiner, so as to attenuate the energy transmitted to the output port by the third sub-wavelength dummy light. Wherein, the third sub-wavelength dummy light has the same wavelength as the third sub-wavelength signal light. In this embodiment, before the third sub-wavelength false light is attenuated by the polarization conversion array, the third sub-wavelength signal light needs to be blocked by the optical switch array, so as to avoid the attenuation of the third sub-wavelength false light At the same time, the third sub-wavelength signal light is enhanced to ensure the attenuation effect.

In some possible implementation manners, the WSS further includes a fourth mirror group and a fifth mirror group. The fourth mirror group is used to collimate and beam-shape the signal light from the signal light input port before guiding it to the first polarization conversion device, and to collimate and beam-shape the false light from the false light input port before guiding it to the first polarization conversion device. A polarization conversion device. The fifth mirror group is used to collimate and shape the combined light from the second dispersive element before guiding it to the output port. Through the above method, the light can also be collimated and beam shaped before the dispersion and after the multiplexing, which enhances the practicability of the solution.

In some possible implementation manners, the first lens group includes a first lens, a second lens and a third lens. The first lens is used to transmit the multiple sub-wavelength signal lights from the first dispersive element, or refract the multiple sub-wavelength signal lights from the first dispersive element in the first direction. The second lens is used for transmitting the multiple sub-wavelength false lights from the first dispersion element, or refracting the multiple sub-wavelength false lights from the first dispersion element in the first direction. The third lens is used for collimating the multiple sub-wavelength signal lights from the first lens in the second direction, and collimating the multiple sub-wavelength false lights from the second lens. Through the foregoing manner, a specific implementation manner of the first mirror group is provided, which improves the feasibility of the solution. In a scene with multiple signal light input ports, multiple signal lights can be focused to the same position of the optical switch array in the first direction through the first lens, and false light can be directed to the optical switch array through the second lens. the other in one direction.

In some possible implementation manners, the second lens group includes a fourth lens, a fifth lens, a sixth lens, a seventh lens and a reflection mirror. The fourth lens is used for converging the sub-wavelength signal light from the optical switch array in the second direction, and converging the sub-wavelength false light from the first lens group. The fifth lens is used for beam shaping the sub-wavelength signal light from the fourth lens. The sixth lens is used to collimate the sub-wavelength signal light from the fifth lens in the second direction and guide it to the polarization beam combiner. The seventh lens is used for beam shaping the sub-wavelength false light from the fourth lens. The mirror is used to reflect the sub-wavelength false light from the seventh lens to the polarization beam combiner. Through the foregoing manner, a specific implementation manner of the second mirror group is provided, which improves the feasibility of the solution.

In some possible implementation manners, the third lens group includes an eighth lens and a ninth lens. The eighth lens is used for converging the sub-wavelength signal light from the polarization splitter in the second direction, and converging the sub-wavelength false light from the polarization splitter. The ninth lens is used for beam shaping the sub-wavelength signal light and sub-wavelength dummy light from the eighth lens. Through the foregoing manner, a specific implementation manner of the third lens group is provided, which improves the feasibility of the solution.

In some possible implementation manners, the optical switch array is LCOS, and the polarization conversion array is Ferroelectric Liquid Crystal on Silicon (F-LCOS). It should be understood that the LCOS can support the adjustment of any deflection direction, and has wider application scenarios. F-LCOS usually only supports two polarization states, which can achieve faster polarization state switching.

In some possible implementations, the WSS also includes a controller, and the optical switch array and the polarization conversion array are controlled by the controller, so as to control the optical switch array to perform wavelength selection according to the actual situation, and control the polarization conversion array to adjust the incident light according to the actual situation. polarization state, and combine the polarization separator to select one of the sub-wavelength signal light and sub-wavelength false light of the same wavelength.

In the embodiment of the present application, the WSS has a signal light input port and a dummy light input port, wherein the dummy light is a light beam that does not carry information. The signal light and false light will be dispersed after passing through the dispersive element, thereby decomposing into multiple sub-wavelength signal light and multiple sub-wavelength false light. The function of the first optical switch array is to adjust the deflection direction of multiple sub-wavelength signal lights to select the sub-wavelength signal light to be transmitted to the second optical switch array. The sub-wavelength signal light of the same wavelength and the sub-wavelength false light have the same incident position on the second optical switch array, and the function of the second optical switch array is to adjust the deflection direction of the incident light at each incident position, so that the sub-wavelength of each wavelength The wavelength signal light and the sub-wavelength dummy light are selected, and the selected sub-wavelength signal light or sub-wavelength dummy light can be transmitted to the output port. In this way, even if the signal light of a certain wavelength drops during transmission, the false light of this wavelength can be selected by the second optical switch array to upload the false light to fill the channel of the wave-dropped signal light, thereby Keep the full wave state, the SRS effect is stable, and the stability of signal transmission is improved. In addition, the second optical switch array only needs to switch in two output directions, the adjustment speed is faster, and the fast uploading of signal light and false light can be realized.

Description of drawings

FIG. 1 is a schematic diagram of an optical transmission system applied in an embodiment of the present application;

Fig. 2 (a) is the schematic diagram of the first optical path of WSS in the dispersion direction in the embodiment of the present application;

Fig. 2 (b) is the schematic diagram of the first optical path of the WSS in the port direction in the embodiment of the present application;

Fig. 3 (a) is the light spot distribution schematic diagram of sub-wavelength signal light and sub-wavelength false light on the first optical switch array;

Fig. 3 (b) is the spot distribution schematic diagram of sub-wavelength signal light and sub-wavelength false light on the second optical switch array;

Figure 4(a) is a schematic diagram of the second optical path of WSS in the dispersion direction in the embodiment of the present application;

Figure 4(b) is a schematic diagram of the second optical path of the WSS in the port direction in the embodiment of the present application;

Figure 5(a) is a schematic diagram of the third optical path of the WSS in the dispersion direction in the embodiment of the present application;

Figure 5(b) is a schematic diagram of the third optical path of the WSS in the port direction in the embodiment of the present application;

Fig. 6 (a) is the schematic diagram of the fourth optical path of WSS in the dispersion direction in the embodiment of the present application;

FIG. 6( b ) is a schematic diagram of a fourth optical path of the WSS in the port direction in the embodiment of the present application.

Detailed ways

The embodiment of the present application provides a wavelength selective switch (Wavelength Selective Switch, WSS), which can quickly upload false light to fill the channel of the wave-dropped signal light, thereby maintaining the full-wave state, the SRS effect is stable, and the efficiency of signal transmission is improved. stability. The terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and are not necessarily used to describe a specific sequence or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, and this is merely a description of the manner in which objects with the same attribute are described in the embodiments of the present application. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, product, or apparatus comprising a series of elements is not necessarily limited to those elements, but may include elements not expressly included. Other elements listed explicitly or inherent to the process, method, product, or apparatus.

FIG. 1 is a schematic diagram of an optical transmission system applied in an embodiment of the present application. As shown in Figure 1, the optical transmission system includes an optical amplifier 1, an optical amplifier 2, a wavelength selective switch 1, a wavelength selective switch 2, an upper and lower wavelength selective switch (Add Drop WSS, ADWSS) 1 and an upper and lower wavelength selective switch 2. It should be understood that in order to ensure the stability of the SRS effect, the channel should be in a full-wave state. The light transmitted on the channel may include signal light and false light, wherein the false light is light that does not carry a signal. That is to say, some idle channels that do not transmit signal light can be filled with false light. As an example, the light passing through the optical amplifier 1 is in a full-wave state, wherein the wavelengths of signal light are λ1-λ4, and the wavelengths of dummy light are λ5 and λ6. After the full-wave light passes through the wavelength selective switch 1, the signal light with the wavelength λ1 is downloaded to the upper and lower wavelength selective switch 1. Moreover, the false light of wavelength λ5 and wavelength λ6 is blocked by the wavelength selective switch 1 , and the upper and lower wavelength selective switch 2 uploads the signal light of wavelength λ5 and wavelength λ6 to the wavelength selective switch 2 . Furthermore, the wavelength selective switch 2 will also upload the false light with the wavelength λ1, so that the light output from the wavelength selective switch 2 to the optical amplifier 2 is still in a full-wave state.

Through the above description, when the light of certain wavelengths is suddenly dropped due to the damage of the laser light source or the failure of the optical amplifier, etc., it is necessary for the WSS to quickly upload false light to fill the channels of these dropped signals and minimize the optical amplifier. Signal power fluctuations and damage caused by transient effects or SRS effects. The WSS provided by the embodiment of the present application is described in detail below.

For ease of introduction, in the following embodiments, the transmission direction of light is defined as Z direction, the distribution direction of ports is defined as X direction, and the dispersion direction of light is defined as Y direction. Wherein, the X direction is perpendicular to the Z direction, the Y direction is perpendicular to the Z direction, and the X direction is perpendicular to the Y direction. In addition, the present application does not limit the numbers of signal light input ports, dummy light input ports, and output ports, and the numbers shown in the drawings are just examples.

Fig. 2(a) is a schematic diagram of the first optical path of the WSS in the dispersion direction in the embodiment of the present application. Fig. 2(b) is a schematic diagram of the first optical path of the WSS in the port direction in the embodiment of the present application. As shown in Fig. 2 (a) and Fig. 2 (b), this wavelength selective switch comprises: signal light input port 10, dummy light input port 20, the first dispersion element 30, the first optical switch array 40, the second optical switch Array 50 , second dispersive element 60 , output port 70 , mirror group 1 , mirror group 2 and mirror group 3 . Wherein, the signal light input port 10 and the dummy light input port 20 are distributed in the X direction. Optionally, the wavelength selective switch may also include mirror group 4 and mirror group 5 .

Specifically, the lens group 4 is used to collimate and beam-shape the signal light from the signal light input port 10 before guiding it to the first dispersion element 30, and to collimate and reshape the false light from the false light input port 20 first. The beam is shaped and then directed to the first dispersive element 30 . The first dispersion element 30 is used to decompose the signal light from the signal input port 10 into multiple sub-wavelength signal lights in the Y direction, and decompose the false light from the false light input port 20 into multiple sub-wavelength false lights in the Y direction . Wherein, the wavelengths of the plurality of sub-wavelength signal lights are different, and the wavelengths of the plurality of sub-wavelength dummy lights are different. The mirror group 1 is used to collimate multiple sub-wavelength signal lights and multiple sub-wavelength false lights in the Y direction, so as to convert the angle difference in the wavelength direction into the position difference in the wavelength direction, and the multiple sub-wavelength signal lights will be respectively incident on the first At different positions of an optical switch array 40 , multiple sub-wavelength false lights are respectively incident on different positions of the first optical switch array 40 . The first optical switch array 40 is used to adjust the deflection directions of the incident multiple sub-wavelength signal lights and multiple sub-wavelength dummy lights. The mirror group 2 is used to guide multiple sub-wavelength signal lights and multiple sub-wavelength dummy lights from the first optical switch array 40 to the second optical switch array 50 to convert positional differences in port directions into angular differences in port directions. Wherein, the incident positions of the sub-wavelength signal light and the sub-wavelength false light of the same wavelength on the second optical switch array 50 are the same, but the incident angles are different. The second optical switch array 50 is used to adjust the deflection direction of the incident light at each incident position, so that the sub-wavelength signal light or sub-wavelength dummy light of each wavelength is transmitted to the output port 70 . It is equivalent to selecting one of the sub-wavelength signal light and the sub-wavelength dummy light of each wavelength through the second optical switch array 50 , wherein the selected sub-wavelength signal light or sub-wavelength dummy light is transmitted to the output port 70 . The mirror group 3 is used to converge the sub-wavelength signal light and/or sub-wavelength dummy light from the second optical switch array 50 in the Y direction. The second dispersion element 60 is used for multiplexing the sub-wavelength signal light and/or sub-wavelength false light from the mirror group 3 . The mirror group 5 is used to shape and collimate the beams of the multiplexed light and guide it to the output port 70 .

Fig. 3(a) is a schematic diagram of spot distribution of sub-wavelength signal light and sub-wavelength false light on the first optical switch array. Fig. 3(b) is a schematic diagram of spot distribution of sub-wavelength signal light and sub-wavelength false light on the second optical switch array. As shown in FIG. 3( a ), the light spot shown by the solid line is the light spot of the sub-wavelength signal light, and the light spot shown by the dotted line is the light spot of the sub-wavelength false light. The light spots of each sub-wavelength signal light and the light spots of each sub-wavelength dummy light are arranged along the Y direction. In addition, on the first optical switch array 40, the spot of sub-wavelength signal light of the same wavelength and the spot of sub-wavelength dummy light have a positional deviation. As shown in FIG. 3( b ), on the second optical switch array 50 , the light spots of sub-wavelength signal light of the same wavelength and the light spots of sub-wavelength false light overlap. It should be understood that, in practical applications, completely or partially overlapped light spots of sub-wavelength signal light and sub-wavelength dummy light of the same wavelength can be regarded as having the same incident position on the second optical switch array 50 .

It should be noted that, both the above-mentioned first optical switch array 40 and the second optical switch array 50 are controlled by a controller (not shown in the figure). The controller realizes the wavelength selection function by controlling the first optical switch array 40, that is, the first optical switch array 40 can guide the sub-wavelength signal light and/or sub-wavelength false light of a specified wavelength to the second optical switch by adjusting the deflection direction of the incident light Array 50. The controller realizes the selection of sub-wavelength signal light and sub-wavelength false light by controlling the second optical switch array 50, that is, the second optical switch array 50 can adjust the sub-wavelength signal light and sub-wavelength false light of the same wavelength by adjusting the deflection direction of the incident light Choose one of the two. It should be understood that the first optical switch array 40 has the ability to adjust any deflection direction, while the second optical switch array 50 can only switch in two deflection directions. Therefore, the adjustment speed of the second optical switch array 50 is faster than that of the first optical switch array 40, and can realize fast uploading of signal light and false light. As an example, for sub-wavelength signal light and sub-wavelength false light of the same wavelength, if the second optical switch array 50 does not change the deflection direction of the incident light, then the sub-wavelength signal light is transmitted to the output port 70; The array 50 changes the deflection direction of the incident light, and then the sub-wavelength false light is transmitted to the output port 70 .

In some possible implementations, if both the sub-wavelength signal light and the sub-wavelength false light of the same wavelength are incident on the second optical switch array 50, the second optical switch array 50 will select to transmit the sub-wavelength signal light, that is, the sub-wavelength signal light passes through The second optical switch array 50 transmits to the output port 70 . If the sub-wavelength signal light is not incident on the second optical switch array 50 or the energy attenuation of the sub-wavelength signal light is large, the second optical switch array 50 will choose to transmit the sub-wavelength false light of the same wavelength, that is, the sub-wavelength false light passes through the second light Switch array 50 transmits to output port 70 . As an example, the energy of the sub-wavelength signal light incident on the second optical switch array 50 may be detected by an optical performance monitoring (Optical Performance Monitoring, OPM) device. Assuming that the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the second optical switch array 50 is greater than or equal to the preset value, the second optical switch array 50 selects to upload the light with the same wavelength as the first sub-wavelength signal light. First sub-wavelength false light. On the contrary, the second optical switch array 50 selects to upload the first sub-wavelength signal light. Wherein, the preset value is subject to actual application, for example, 5dB, which is not limited here. It should be understood that by detecting the energy of the incident sub-wavelength signal light on the second optical switch array 50, the sub-wavelength signal light and sub-wavelength false light of the same wavelength can be reasonably selected, so that the normally transmitted sub-wavelength signal light can still continue to transmit , for abnormally transmitted sub-wavelength signal light, sub-wavelength false light can be uploaded to ensure that the light after passing through the WSS is in a full-wave state.

It should be noted that, the present application does not limit the specific types of the first optical switch array 40 and the second optical switch array 50 . As an example, the first optical switch array 40 adopts liquid crystal on silicon (Liquid Crystal on Silicon, LCOS), and the second optical switch array 50 adopts digital light processor (Digital Light Processer, DLP). It should be understood that the DLP may also be called a digital micromirror device (Digital Micromirror Device, DMD). The present application also does not limit the specific types of the first dispersion element 30 and the second dispersion element 60 . As an example, the first dispersive element 30 and the second dispersive element 60 may be gratings, diffractive optical elements (Difractive Optical Element, DOE) or metasurface elements.

In some possible implementation manners, the WSS shown in FIG. 2( a ) and FIG. 2( b ) may also be used to attenuate sub-wavelength signal light or sub-wavelength false light. It should be understood that the deflection direction of the sub-wavelength signal light or the sub-wavelength false light is specifically adjusted by the second optical switch array 50 to perform attenuation. In addition, before attenuating the sub-wavelength signal light, it is also necessary to prevent the sub-wavelength false light of the same wavelength from entering the second optical switch array 50. Because, if both the sub-wavelength signal light and the sub-wavelength false light of the same wavelength are incident on the second optical switch array 50, the sub-wavelength false light will be enhanced while the sub-wavelength signal light is attenuated, affecting the attenuation effect on the sub-wavelength signal light. That is to say, if the second optical switch array 50 reduces a part of the sub-wavelength signal light transmitted to the output port 70, a part of the sub-wavelength false light transmitted to the output port 70 will be correspondingly increased, and the two are in a trade-off relationship. . Similarly, before attenuating sub-wavelength false light, it is also necessary to prevent sub-wavelength signal light of the same wavelength from entering the second optical switch array 50 . The following specific implementation methods will be introduced respectively.

Embodiment 1: Attenuation of sub-wavelength signal light.

The first optical switch array 40 adjusts the deflection direction of the incident second sub-wavelength dummy light so that the second sub-wavelength dummy light does not guide to the second optical switch array 50 . The second optical switch array 50 adjusts the deflection direction of the incident second sub-wavelength signal light to attenuate the energy transmitted to the output port 70 by the second sub-wavelength signal light. Wherein, the wavelength of the second sub-wavelength signal light is the same as that of the second sub-wavelength dummy light.

Embodiment 2: Attenuating sub-wavelength false light.

The first optical switch array 40 adjusts the deflection direction of the incident third sub-wavelength signal light so that the third sub-wavelength signal light does not guide to the second optical switch array 50 . The second optical switch array 50 adjusts the deflection direction of the third sub-wavelength dummy light to attenuate the energy transmitted to the output port 70 by the third sub-wavelength dummy light. Wherein, the third sub-wavelength signal light and the third sub-wavelength dummy light have the same wavelength.

It should be noted that the present application does not limit the composition of the mirror group 1 , the mirror group 2 , the mirror group 3 , the mirror group 4 and the mirror group 5 , and a specific implementation is provided below.

As shown in Figure 2 (a) and Figure 2 (b), mirror group 1 includes lens 1, lens 2 and lens 3, mirror group 2 includes lens 4, lens 5 and lens 6, mirror group 3 includes lens 7 and lens 8 , the mirror group 4 includes a lens 9 and a lens 10 , and the mirror group 5 includes a lens 11 and a lens 12 . Specifically, the lens 9 is used for collimating the incident signal light and false light, and the lens 10 is used for beam shaping the incident signal light and false light. The lens 1 is used to converge the multi-path sub-wavelength signal lights from multiple signal light input ports 10 in the X direction. Taking the three signal light input ports 10 shown in FIG. 2(b) as an example, along the optical axis of the lens 1 The transmitted one-way sub-wavelength signal light is transmitted to the first optical switch array 40 through the lens 1, and the other two-way sub-wavelength signal light is refracted to the first optical switch array 40 through the lens 1, and the three-way sub-wavelength signal light is converged to the first optical switch array 40 at the same position in the X direction. The function of lens 2 is similar to that of lens 1, and is used to transmit or refract the incident sub-wavelength false light in the X direction, so that the sub-wavelength false light and sub-wavelength signal light incident on the first optical switch array 40 are in the X direction. The incidence position is different. The lens 3 is used to collimate the incident multiple sub-wavelength signal lights and multiple sub-wavelength false lights in the Y direction. The lens 4 is used to converge the incident sub-wavelength signal light and the incident sub-wavelength false light in the Y direction, and the lens 5 is used to converge the incident sub-wavelength signal light and sub-wavelength false light in the X direction. The lens 6 is used to collimate the incident sub-wavelength signal light and sub-wavelength false light in the Y direction. The lens 7 is used to converge the incident sub-wavelength signal light and the incident sub-wavelength dummy light in the Y direction, and the lens 8 is used to perform beam shaping on the incident sub-wavelength signal light and sub-wavelength dummy light. The lens 11 is used to shape the beam of the light combined by the second dispersion element 60 , and the lens 12 is used to collimate the combined light.

In a possible implementation manner, as shown in FIG. 2( a ), the front focal plane of the lens 10 coincides with the back focal plane of the lens 9 . The first dispersion element 30 is located at the rear focal plane of the lens 10 and at the front focal plane of the lens 3 . The first optical switch array 40 is located at the rear focal plane of the lens 3 and at the front focal plane of the lens 4. The rear focal plane of lens 4 coincides with the front focal plane of lens 6 . The second optical switch array 50 is located at the rear focal plane of the lens 6 and at the front focal plane of the lens 7 . The second dispersion element 60 is located at the rear focal plane of the lens 7 and at the front focal plane of the lens 11 . The lens 11 is located at the front focal plane of the lens 12 . As shown in FIG. 2( b ), the lens 1 is close to the first dispersion element 30 , and the lens 8 is close to the second dispersion element 60 . The front focal plane of lens 1 coincides with the back focal plane of lens 9 . The first optical switch array 40 is located on the back focal plane of the lens 1 . The front focal plane of lens 2 coincides with the back focal plane of lens 9 . The first optical switch array 40 is located on the back focal plane of the lens 2 . The first optical switch array 40 is located on the front focal plane of the lens 5 , and the second optical switch array 50 is located on the rear focal plane of the lens 5 . The second optical switch array 50 is located on the front focal plane of the lens 8 . The back focal plane of lens 8 coincides with the front focal plane of lens 12 .

It should be noted that, on the basis of the WSS shown in Fig. 2(a) and Fig. 2(b) above, it can also be deformed, so that multiple sub-wavelength false lights from mirror group 1 are directly transmitted to mirror group 2 without passing through the second An optical switch array 40 . Introduce below in conjunction with accompanying drawing.

Fig. 4(a) is a schematic diagram of the second optical path of the WSS in the dispersion direction in the embodiment of the present application. Fig. 4(b) is a schematic diagram of the second optical path of the WSS in the port direction in the embodiment of the present application. It should be understood that FIG. 4( a ) shows a schematic diagram of the optical path of the false light in the dispersion direction in this embodiment. The beam schematic diagram of the signal light in the dispersion direction in this embodiment is the same as that of FIG. 2( a ). As shown in FIG. 4( a ) and FIG. 4( b ), sub-wavelength signal light passes through the first optical switch array 40 , while sub-wavelength false light does not pass through the first optical switch array 40 . In this embodiment, the first optical switch array 40 does not need to adjust the deflection direction of the sub-wavelength dummy light, and each sub-wavelength dummy light will be incident on the second optical switch array 50 . Therefore, the first optical switch array 40 with a smaller size can be used, which reduces the cost. However, this embodiment cannot be applied in scenarios where sub-wavelength signal light needs to be attenuated. It should be understood that, except for the differences described above, this embodiment is similar to the embodiment shown in FIG. 2(a) and FIG. 2(b), and other identical features can be referred to in FIG. The relevant description of the illustrated embodiment is not repeated here.

Through the introduction of the above-mentioned embodiments, it can be seen that the incident positions of the sub-wavelength signal light and the sub-wavelength false light of the same wavelength on the second optical switch array are the same, and the function of the second optical switch array is to adjust the deflection of the incident light at each incident position. direction, so as to select one of the sub-wavelength signal light and sub-wavelength false light of each wavelength, and the selected sub-wavelength signal light or sub-wavelength false light can be transmitted to the output port. In this way, even if the signal light of a certain wavelength drops during transmission, the false light of this wavelength can be selected by the second optical switch array to upload the false light to fill the channel of the wave-dropped signal light, thereby Keep the full wave state, the SRS effect is stable, and the stability of signal transmission is improved. In addition, the second optical switch array only needs to switch in two output directions, the adjustment speed is faster, and the fast uploading of signal light and false light can be realized.

The above-mentioned embodiment introduces one of the WSS structures provided by the present application, mainly by adjusting the deflection direction of the incident light to select and upload signal light or false light. Another WSS structure provided by the present application will be introduced below, which mainly selects to upload signal light or false light by adjusting the polarization state of light.

Fig. 5(a) is a schematic diagram of the third optical path of the WSS in the dispersion direction in the embodiment of the present application. Fig. 5(b) is a schematic diagram of the third optical path of the WSS in the port direction in the embodiment of the present application. As shown in Figure 5 (a) and Figure 5 (b), the wavelength selective switch includes: a signal light input port 10, a false light input port 20, a first dispersive element 30, an optical switch array 40, a second dispersive element 60, Output port 70 , first polarization conversion device 80 , second polarization conversion device 90 , polarization beam combiner 100 , polarization conversion array 110 , polarization splitter 120 , mirror group 1 , mirror group 2 and mirror group 3 . Wherein, the signal light input port 10 and the dummy light input port 20 are distributed in the X direction. Optionally, the wavelength selective switch may also include mirror group 4 and mirror group 5 .

Specifically, the signal light from the signal light input port 10 has components on the first polarization state and the second polarization state, and likewise, the false light from the false light input port 20 has components on the first polarization state and the second polarization state Both also have weight. Wherein, the first polarization state and the second polarization state are orthogonal to each other. The first polarization conversion device 80 is used to convert the signal light from the signal light input port 10 into a first polarization state. The second polarization conversion device 90 is used for converting the dummy light from the dummy light input port 20 into a second polarization state. The mirror group 4 is used to collimate and beam-shape the signal light from the signal light input port 10 before guiding it to the first dispersion element 30, and to collimate and beam-shape the false light from the false light input port 20 first. It is redirected to the first dispersive element 30 . The first dispersion element 30 is used to decompose the incident signal light into multiple sub-wavelength signal lights in the Y direction, and decompose the incident false light into multiple sub-wavelength false lights in the Y direction. Wherein, the wavelengths of the plurality of sub-wavelength signal lights are different, and the wavelengths of the plurality of sub-wavelength dummy lights are different. The mirror group 1 is used to collimate multiple sub-wavelength signal lights and multiple sub-wavelength false lights in the Y direction, so as to convert the angle difference in the wavelength direction into the position difference in the wavelength direction, and the multiple sub-wavelength signal lights will be respectively incident on the light At different positions of the switch array 40 , multiple sub-wavelength false lights are respectively incident on different positions of the optical switch array 40 . The optical switch array 40 is used to adjust the deflection directions of the incident multiple sub-wavelength signal lights and multiple sub-wavelength false lights. The mirror group 2 is used to guide multiple sub-wavelength signal lights and multiple sub-wavelength false lights from the optical switch array 40 to the polarization beam combiner 100 . The polarization beam combiner 100 is used to combine the input sub-wavelength signal light and sub-wavelength dummy light, and guide the combined sub-wavelength signal light and sub-wavelength dummy light to the polarization conversion array 110 . Wherein, the incident positions of sub-wavelength signal light and sub-wavelength dummy light of the same wavelength on the polarization conversion array 110 are the same. The polarization conversion array 110 is used to adjust the polarization state of the incident light at each incident position, so as to select the polarization state of each sub-wavelength signal light and the polarization state of each sub-wavelength dummy light output from the polarization conversion array 110 . Wherein, the sub-wavelength signal light and the sub-wavelength dummy light of the same wavelength output from the polarization conversion array 110 have different polarization states. The polarization splitter 120 is configured to transmit the input sub-wavelength signal light and/or sub-wavelength dummy light with the first polarization state, and reflect the input sub-wavelength signal light and/or sub-wavelength dummy light with the second polarization state. The mirror group 3 is used for converging the sub-wavelength signal light and/or the sub-wavelength dummy light transmitted by the polarization splitter 120 in the Y direction. The second dispersion element 60 is used for multiplexing the sub-wavelength signal light and/or sub-wavelength false light from the mirror group 3 . The mirror group 5 is used to shape and collimate the beams of the multiplexed light and guide it to the output port 70 .

In this embodiment, the spot distribution of the sub-wavelength signal light and the sub-wavelength false light on the optical switch array 40 can be as shown in FIG. As shown in Figure 3(b) above. The light spots of the sub-wavelength signal light of the same wavelength and the light spots of the sub-wavelength dummy light completely overlap or partially overlap, which can be regarded as having the same incident position on the polarization conversion array 110 .

It should be noted that both the optical switch array 40 and the polarization conversion array 110 mentioned above are controlled by a controller (not shown in the figure). The controller realizes the wavelength selection function by controlling the optical switch array 40 , that is, the optical switch array 40 can guide the sub-wavelength signal light and/or sub-wavelength false light of a specified wavelength to the polarization conversion array 110 by adjusting the deflection direction of the incident light. The controller converts the polarization state of the sub-wavelength signal light and the sub-wavelength dummy light of the same wavelength by controlling the polarization conversion array 110 , and selects one of the sub-wavelength signal light and the sub-wavelength dummy light of the same wavelength in combination with the polarization separator 120 . It should be understood that the polarization conversion array 110 only needs to convert the polarization state of the incident light, the adjustment speed is faster, and the signal light and false light can be uploaded quickly. As an example, for sub-wavelength signal light and sub-wavelength false light of the same wavelength, if the polarization conversion array 110 does not change the polarization state of the incident light, the sub-wavelength signal light will be transmitted to the output port 70 through the polarization splitter 120; if The polarization conversion array 110 changes the polarization state of the incident light, and then the sub-wavelength false light is transmitted to the output port 70 through the polarization separator 120 .

In some possible implementations, if both sub-wavelength signal light and sub-wavelength false light of the same wavelength are incident on the polarization conversion array 110, the sub-wavelength signal light output from the polarization conversion array 110 will maintain the first polarization state, that is, the sub-wavelength signal Light may be transmitted to output port 70 through polarization splitter 120 . If the sub-wavelength signal light is not incident on the polarization conversion array 110 or the energy attenuation of the sub-wavelength signal light is large, the polarization conversion array 110 will convert the sub-wavelength false light of the same wavelength into the first polarization state, that is, the sub-wavelength false light can pass through the polarization Splitter 120 transmits to output port 70 . As an example, the energy of the sub-wavelength signal light incident on the polarization conversion array 110 may be detected by an OPM device. Assuming that the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the polarization conversion array 110 is greater than or equal to a preset value, the first sub-wavelength false light output by the polarization conversion array 110 has a first polarization state. On the contrary, the first sub-wavelength signal light output by the second optical switch array 50 maintains the first polarization state. Wherein, the preset value is subject to actual application, for example, 5dB, which is not limited here. It should be understood that by detecting the energy of the sub-wavelength signal light incident on the polarization conversion array 110, the sub-wavelength signal light and the sub-wavelength false light of the same wavelength can be reasonably selected, so that the normally transmitted sub-wavelength signal light can still continue to transmit, for The abnormally transmitted sub-wavelength signal light can be uploaded with sub-wavelength false light to ensure that the light after passing through the WSS is in a full-wave state.

It should be noted that, the present application does not limit the specific types of the optical switch array 40 and the polarization conversion array 110 . As an example, the optical switch array 40 adopts LCOS, and the polarization conversion array 110 adopts Ferroelectric Liquid Crystal on Silicon (F-LCOS). The present application also does not limit the specific types of the first dispersion element 30 and the second dispersion element 60 . As an example, the first dispersive element 30 and the second dispersive element 60 may be gratings, DOEs or metasurface elements.

In some possible implementation manners, the WSS shown in FIG. 5( a ) and FIG. 5( b ) may also be used to attenuate sub-wavelength signal light or sub-wavelength false light. It should be understood that the polarization state of sub-wavelength signal light or sub-wavelength false light is specifically adjusted through the polarization conversion array 110 to perform attenuation. In addition, before attenuating the sub-wavelength signal light, it is also necessary to prevent the sub-wavelength spurious light of the same wavelength from entering the polarization conversion array 110 . Because, if both the sub-wavelength signal light and the sub-wavelength false light of the same wavelength are incident on the polarization conversion array 110, the sub-wavelength signal light will be attenuated while the sub-wavelength false light will be enhanced, which will affect the attenuation effect on the sub-wavelength signal light. That is to say, if a part of the sub-wavelength signal light transmitted to the output port 70 is reduced through the polarization conversion array 110, a part of the sub-wavelength spurious light transmitted to the output port 70 will be correspondingly increased, and the two are in a trade-off relationship. Similarly, before attenuating sub-wavelength false light, it is also necessary to prevent sub-wavelength signal light of the same wavelength from entering the polarization conversion array 110 . The following specific implementation methods will be introduced respectively.

Embodiment 1: Attenuation of sub-wavelength signal light.

The optical switch array 40 adjusts the deflection direction of the incident second sub-wavelength dummy light so that the second sub-wavelength dummy light does not lead to the polarization beam combiner 100 . The polarization conversion array 110 adjusts the polarization state of the incident second sub-wavelength signal light to attenuate the energy transmitted to the output port 70 by the second sub-wavelength signal light. Wherein, the wavelength of the second sub-wavelength signal light is the same as that of the second sub-wavelength dummy light.

Embodiment 2: Attenuating sub-wavelength false light.

The optical switch array 40 adjusts the deflection direction of the incident third sub-wavelength signal light so that the third sub-wavelength signal light does not guide to the polarization beam combiner 100 . The polarization conversion array 110 adjusts the deflection direction of the third sub-wavelength dummy light to attenuate the energy transmitted to the output port 70 by the third sub-wavelength dummy light. Wherein, the third sub-wavelength signal light and the third sub-wavelength dummy light have the same wavelength.

As shown in Fig. 5 (a) and Fig. 5 (b), mirror group 1 comprises lens 1, lens 2 and lens 3, mirror group 2 comprises lens 4, lens 5, lens 6, lens 13 and reflecting mirror, mirror group 3 Including lens 7 and lens 8 , lens group 4 includes lens 9 and lens 10 , and lens group 5 includes lens 11 and lens 12 . Specifically, the lens 9 is used for collimating the incident signal light and false light, and the lens 10 is used for beam shaping the incident signal light and false light. The lens 1 is used to converge the multi-channel sub-wavelength signal lights from multiple signal light input ports 10 in the X direction. Taking the three signal light input ports 10 shown in FIG. 5(b) as an example, along the optical axis of the lens 1 The transmitted one-way sub-wavelength signal light is transmitted to the optical switch array 40 through the lens 1, and the other two-way sub-wavelength signal light is refracted to the optical switch array 40 through the lens 1, and the three-way sub-wavelength signal light is converged to the optical switch array 40 in the X direction. same location. The function of lens 2 is similar to that of lens 1, and is used to transmit or refract the incident sub-wavelength false light in the X direction, so that the sub-wavelength false light incident on the optical switch array 40 and the incident sub-wavelength signal light in the X direction The location is different. The lens 3 is used to collimate the incident multiple sub-wavelength signal lights and multiple sub-wavelength false lights in the Y direction. Lens 4 is used to converge the incident sub-wavelength signal light in the Y direction and converge the incident sub-wavelength false light. Lens 5 is used to shape the incident sub-wavelength signal light. The incident sub-wavelength signal light is collimated. The lens 13 is used to shape the incident sub-wavelength false light, and the mirror is used to reflect the sub-wavelength false light from the lens 13 to the polarization beam combiner 100 . The lens 7 is used to converge the incident sub-wavelength signal light and the incident sub-wavelength dummy light in the Y direction, and the lens 8 is used to perform beam shaping on the incident sub-wavelength signal light and sub-wavelength dummy light. The lens 11 is used to shape the beam of the light combined by the second dispersion element 60 , and the lens 12 is used to collimate the combined light.

In a possible implementation manner, as shown in FIG. 5( a ), the front focal plane of the lens 10 coincides with the back focal plane of the lens 9 . The first dispersion element 30 is located at the rear focal plane of the lens 10 and at the front focal plane of the lens 3 . The optical switch array 40 is located at the rear focal plane of the lens 3 and at the front focal plane of the lens 4 . The rear focal plane of lens 4 coincides with the front focal plane of lens 6 . The polarization conversion array 110 is located at the back focal plane of the lens 6 and at the front focal plane of the lens 7 . The second dispersion element 60 is located at the rear focal plane of the lens 7 and at the front focal plane of the lens 11 . The lens 11 is located at the front focal plane of the lens 12 . As shown in FIG. 5( b ), the lens 1 is close to the first dispersion element 30 , and the lens 8 is close to the second dispersion element 60 . The front focal plane of lens 1 coincides with the back focal plane of lens 9 . The optical switch array 40 is located at the rear focal plane of the lens 1 . The front focal plane of lens 2 coincides with the back focal plane of lens 9 . The optical switch array 40 is located on the back focal plane of the lens 2 . The optical switch array 40 is located on the front focal plane of the lens 5 , and the second optical switch array 50 is located on the rear focal plane of the lens 5 . The optical switch array 40 is located on the front focal plane of the lens 13 , and the second optical switch array 50 is located on the rear focal plane of the lens 13 . The polarization conversion array 110 is located at the front focal plane of the lens 8 . The back focal plane of lens 8 coincides with the front focal plane of lens 12 .

It should be noted that, on the basis of the above WSS shown in Figure 5(a) and Figure 5(b), deformations can also be made, so that multiple sub-wavelength false lights from mirror group 1 are directly transmitted to mirror group 2 without passing through the light switch array 40 . Introduce below in conjunction with accompanying drawing.

Fig. 6(a) is a schematic diagram of the fourth optical path of the WSS in the dispersion direction in the embodiment of the present application. FIG. 6( b ) is a schematic diagram of a fourth optical path of the WSS in the port direction in the embodiment of the present application. It should be understood that FIG. 6( a ) shows a schematic diagram of the optical path of the false light in the dispersion direction in this embodiment. The beam schematic diagram of the signal light in the dispersion direction in this embodiment is the same as the above-mentioned FIG. 5( a ). As shown in FIG. 6( a ) and FIG. 6( b ), sub-wavelength signal light passes through the optical switch array 40 , while sub-wavelength false light does not pass through the optical switch array 40 . In this embodiment, the optical switch array 40 does not need to adjust the deflection direction of the sub-wavelength dummy light, and each sub-wavelength dummy light will be incident on the polarization beam combiner 100 . Therefore, an optical switch array 40 with a smaller size can be used, reducing the cost. However, this embodiment cannot be applied in scenarios where sub-wavelength signal light needs to be attenuated. It should be understood that, except for the differences described above, this embodiment is similar to the embodiment shown in FIG. 5(a) and FIG. 5(b), and other identical features can be referred to in FIG. The relevant description of the illustrated embodiment is not repeated here.

Through the introduction of the above-mentioned embodiments, it can be seen that the incident position of the sub-wavelength signal light and sub-wavelength false light on the polarization conversion array is the same, and the function of the polarization conversion array is to adjust the polarization state of the incident light at each incident position, and combine The polarization separator selects one of the sub-wavelength signal light and the sub-wavelength dummy light of each wavelength, and the selected sub-wavelength signal light or sub-wavelength dummy light can be transmitted to the output port. In this way, even if the signal light of a certain wavelength is dropped during transmission, the false light of this wavelength can be selected through the polarization conversion array and the deflection splitter to upload the false light to fill the channel of the dropped signal light , so as to maintain the full wave state, the SRS effect is stable, and the stability of signal transmission is improved. In addition, the use of the polarization conversion array only needs to convert the incident light between two polarization states, the adjustment speed is faster, and the signal light and false light can be uploaded quickly.

It should be noted that, the above-mentioned embodiments are all introduced by using the transmissive optical switch array 40 . In some possible implementation manners, a reflective optical switch array 40 may also be used. That is to say, the output port 70 in the WSS is located on the same side as the signal light input port 10 and the dummy light input port 20 , and a folded light path is adopted. It should be understood that the embodiment using the reflective optical switch array 40 can be obtained by simple transformation on the basis of the above-mentioned embodiments, and no drawings and text descriptions are provided here.

It should be noted that the above embodiments are only used to illustrate the technical solution of the present application, rather than to limit it. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications Or replacement, does not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

A wavelength selective switch WSS, characterized in that it includes: a signal light input port, a dummy light input port, an output port, a first dispersive element, a second dispersive element, a first optical switch array, a second optical switch array, a first The mirror group, the second mirror group and the third mirror group, wherein the signal light input ports and the dummy light input ports are distributed along the first direction;

The first dispersion element is used to decompose the signal light from the signal light input port into a plurality of sub-wavelength signal lights in the second direction, and divide the false light from the false light input port in the second direction light is decomposed into a plurality of sub-wavelength false lights, and the second direction is perpendicular to the first direction;

The first lens group is used to collimate the plurality of sub-wavelength signal lights and the plurality of sub-wavelength false lights in the second direction;

The first optical switch array is used to adjust the deflection directions of multiple sub-wavelength signal lights from the first lens;

The second mirror group is used to guide the sub-wavelength signal light from the first optical switch array and the sub-wavelength false light from the first mirror group to the second optical switch array, wherein the sub-wavelength signals of the same wavelength The incident positions of the wavelength signal light and the sub-wavelength false light on the second optical switch array are the same;

The second optical switch array is used to adjust the deflection direction of the incident light at each incident position, so that the sub-wavelength signal light or sub-wavelength false light of each wavelength is transmitted to the output port;

The third mirror group is used to converge the sub-wavelength signal light and/or sub-wavelength false light from the second optical switch array in the second direction;

The second dispersive element is used for multiplexing the sub-wavelength signal light and/or sub-wavelength false light from the third mirror group, and guiding the multiplexed light to the output port.
The WSS according to claim 1, wherein if the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the second optical switch array is greater than or equal to a preset value, the first The first sub-wavelength false light incident at the incident position is transmitted to the output port through the second optical switch array;

If the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the second optical switch array is less than the preset value, the first sub-wavelength signal light passes through the second optical switch array to The output port transmits.
The WSS according to claim 1 or 2, characterized in that the multiple sub-wavelength false lights from the first optical group are transmitted to the second optical group through the first optical switch array.
The WSS according to claim 3, wherein the first optical switch array is also used to adjust the deflection direction of the second sub-wavelength false light from the first mirror group, wherein the adjusted deflection direction of the The second sub-wavelength false light is not directed to the second optical switch array;

The second optical switch array is used to adjust the deflection direction of the second sub-wavelength signal light from the second mirror group, so as to attenuate the energy transmitted by the second sub-wavelength signal light to the output port. The second sub-wavelength dummy light has the same wavelength as the second sub-wavelength signal light.
The WSS according to any one of claims 1 to 4, wherein the third sub-wavelength signal light is not guided to the second optical switch array after the deflection direction is adjusted by the first optical switch array;

The second optical switch array is used to adjust the deflection direction of the third sub-wavelength false light from the second mirror group, so as to attenuate the energy transmitted by the third sub-wavelength false light to the output port, and the first The third sub-wavelength dummy light has the same wavelength as the third sub-wavelength signal light.
The WSS according to any one of claims 1 to 5, wherein the WSS further comprises a fourth mirror group and a fifth mirror group;

The fourth mirror group is used to collimate and shape the signal light from the signal light input port before guiding it to the first dispersion element, and to collimate the false light from the false light input port first. directing and shaping the beam to redirect the first dispersive element;

The fifth mirror group is used to collimate and shape the combined light from the second dispersive element before guiding it to the output port.
The WSS according to any one of claims 1 to 6, wherein the first lens group comprises a first lens, a second lens and a third lens;

The first lens is used to transmit the multiple sub-wavelength signal lights from the first dispersive element, or to transmit the multiple sub-wavelength signal lights from the first dispersive element in the first direction refraction;

The second lens is used to transmit the multiple sub-wavelength pseudo-lights from the first dispersive element, or to transmit the multiple sub-wavelength pseudo-lights from the first dispersive element in the first direction refraction;

The third lens is used to collimate the multiple sub-wavelength signal lights from the first lens in the second direction, and collimate the multiple sub-wavelength false lights from the second lens. collimation.
The WSS according to any one of claims 1 to 7, wherein the second lens group comprises a fourth lens, a fifth lens and a sixth lens;

The fourth lens is used for converging the sub-wavelength signal light from the first optical switch array in the second direction, and converging the sub-wavelength false light from the first mirror group;

The fifth lens is used to converge the sub-wavelength signal light and sub-wavelength false light from the fourth lens in the first direction;

The sixth lens is configured to collimate the sub-wavelength signal light and the sub-wavelength false light from the fifth lens in the second direction and direct them to the second optical switch array.
The WSS according to any one of claims 1 to 8, wherein the third lens group includes a seventh lens and an eighth lens;

The seventh lens is used for converging the sub-wavelength signal light from the second optical switch array in the second direction, and converging the sub-wavelength false light from the second optical switch array;

The eighth lens is used for beam shaping the sub-wavelength signal light and sub-wavelength dummy light from the seventh lens.
The WSS according to any one of claims 1 to 9, wherein the first optical switch array is a liquid crystal on silicon LCOS, and the second optical switch array is a digital light processor (DLP).
The WSS according to any one of claims 1 to 10, wherein the WSS further comprises a controller, and the first optical switch array and the second optical switch array are controlled by the controller.
A wavelength selective switch WSS, characterized in that it includes: a signal light input port, a dummy light input port, an output port, a first dispersive element, a second dispersive element, an optical switch array, a first polarization conversion device, and a second polarization conversion device, polarization beam combiner, polarization conversion array, polarization splitter, first mirror group, second mirror group and third mirror group, wherein the signal light input ports and the dummy light input ports are distributed along the first direction ;

The first polarization conversion device is used to convert the signal light from the signal light input port into a first polarization state;

The second polarization conversion device is used to convert the dummy light from the dummy light input port into a second polarization state, and the first polarization state and the second polarization state are orthogonal to each other;

The first dispersion element is used to decompose the signal light from the first polarization conversion device into a plurality of sub-wavelength signal lights in the second direction, and split the signal light from the second polarization conversion device in the second direction The false light is decomposed into a plurality of sub-wavelength false lights, and the second direction is perpendicular to the first direction;

The first lens group is used to collimate the plurality of sub-wavelength signal lights and the plurality of sub-wavelength false lights in the second direction;

The optical switch array is used to adjust the deflection directions of multiple sub-wavelength signal lights from the first lens;

The second mirror group is used to guide the sub-wavelength signal light from the optical switch array and the sub-wavelength false light from the first mirror group to the polarization beam combiner;

The polarization beam combiner is used to combine the sub-wavelength signal light and sub-wavelength dummy light from the second mirror group, and guide the combined sub-wavelength signal light and sub-wavelength dummy light to the polarization conversion array, wherein , the incident positions of sub-wavelength signal light and sub-wavelength false light of the same wavelength on the polarization conversion array are the same;

The polarization conversion array is used to adjust the polarization state of the incident light at each incident position to select the polarization state of each sub-wavelength signal light output from the polarization conversion array and the polarization state of each sub-wavelength false light, wherein, from The polarization states of the sub-wavelength signal light and the sub-wavelength false light of the same wavelength output by the polarization conversion array are different;

The polarization splitter is used to transmit the sub-wavelength signal light and/or sub-wavelength dummy light with the first polarization state from the polarization conversion array, and reflect the sub-wavelength signal with the second polarization state from the polarization conversion array light and/or sub-wavelength spurious light;

The third mirror group is used to converge the sub-wavelength signal light and/or sub-wavelength false light transmitted by the polarization splitter in the second direction;

The second dispersive element is used for multiplexing the sub-wavelength signal light and/or sub-wavelength false light from the third mirror group, and guiding the multiplexed light to the output port.
The WSS according to claim 12, wherein if the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the polarization conversion array is greater than or equal to a preset value, the first incident position The first sub-wavelength dummy light incident at the position has a first polarization state after passing through the polarization conversion array, and the first sub-wavelength signal light has a second polarization state after passing through the polarization conversion array;

If the energy attenuation of the first sub-wavelength signal light incident at the first incident position on the second optical switch array is less than the preset value, the first sub-wavelength false light has the first sub-wavelength false light after passing through the polarization conversion array. Two polarization states, the first sub-wavelength signal light has a first polarization state after passing through the polarization conversion array.
The WSS according to claim 12 or 13, wherein the plurality of sub-wavelength false lights from the first mirror group are transmitted to the second mirror group through the optical switch array.
The WSS according to claim 14, wherein the optical switch array is also used to adjust the deflection direction of the second sub-wavelength false light from the first mirror group, wherein the first Two sub-wavelength false lights are not guided to the polarization beam combiner;

The polarization conversion array is used to adjust the polarization state of the second sub-wavelength signal light from the polarization beam combiner, so as to attenuate the energy transmitted by the second sub-wavelength signal light to the output port, and the second sub-wavelength signal light The false wavelength light has the same wavelength as the second sub-wavelength signal light.
The WSS according to any one of claims 12 to 14, wherein the third sub-wavelength signal light is not guided to the polarization beam combiner after the deflection direction is adjusted by the optical switch array;

The polarization conversion array is used to adjust the polarization state of the third sub-wavelength dummy light from the polarization beam combiner, so as to attenuate the energy transmitted by the third sub-wavelength dummy light to the output port, and the third sub-wavelength dummy light The false wavelength light has the same wavelength as the third sub-wavelength signal light.
The WSS according to any one of claims 12 to 16, wherein the WSS further comprises a fourth mirror group and a fifth mirror group;

The fourth mirror group is used to collimate and beam-shape the signal light from the signal light input port before guiding it to the first polarization conversion device, and to firstly perform a collimation and beam shaping on the false light from the false light input port. collimating and beam shaping redirecting to said first polarization conversion means;

The fifth mirror group is used to collimate and shape the combined light from the second dispersive element before guiding it to the output port.
The WSS according to any one of claims 12 to 17, wherein the first lens group comprises a first lens, a second lens and a third lens;

The first lens is used to transmit the multiple sub-wavelength signal lights from the first dispersive element, or to transmit the multiple sub-wavelength signal lights from the first dispersive element in the first direction refraction;

The second lens is used to transmit the multiple sub-wavelength pseudo-lights from the first dispersive element, or to transmit the multiple sub-wavelength pseudo-lights from the first dispersive element in the first direction refraction;

The third lens is used to collimate the plurality of sub-wavelength signal lights from the first lens in the second direction, and collimate the plurality of sub-wavelength false lights from the second lens. collimation.
The WSS according to any one of claims 12 to 18, wherein the second lens group comprises a fourth lens, a fifth lens, a sixth lens, a seventh lens and a mirror;

The fourth lens is used for converging the sub-wavelength signal light from the optical switch array in the second direction, and converging the sub-wavelength false light from the first lens group;

The fifth lens is used for beam shaping the sub-wavelength signal light from the fourth lens;

The sixth lens is used to collimate the sub-wavelength signal light from the fifth lens in the second direction and guide it to the polarization beam combiner;

The seventh lens is used for beam shaping the sub-wavelength false light from the fourth lens;

The reflection mirror is used to reflect the sub-wavelength false light from the seventh lens to the polarization beam combiner.
The WSS according to any one of claims 12 to 19, wherein the third lens group includes an eighth lens and a ninth lens;

The eighth lens is used for converging the sub-wavelength signal light from the polarization splitter in the second direction, and converging the sub-wavelength false light from the polarization splitter;

The ninth lens is used for beam shaping the sub-wavelength signal light and sub-wavelength dummy light from the eighth lens.
The WSS according to any one of claims 12 to 20, wherein the optical switch array is liquid crystal on silicon LCOS, and the polarization conversion array is ferroelectric liquid crystal on silicon F-LCOS.
The WSS according to any one of claims 12 to 21, wherein the WSS further comprises a controller, and the optical switch array and the polarization conversion array are controlled by the controller.