CN112039625A - Spatial light modulation device, spatial light modulation method, and optical switch - Google Patents
Spatial light modulation device, spatial light modulation method, and optical switch Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0202—Arrangements therefor
- H04J14/021—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM]
- H04J14/0212—Reconfigurable arrangements, e.g. reconfigurable optical add/drop multiplexers [ROADM] or tunable optical add/drop multiplexers [TOADM] using optical switches or wavelength selective switches [WSS]
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/13306—Circuit arrangements or driving methods for the control of single liquid crystal cells
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1343—Electrodes
- G02F1/134309—Electrodes characterised by their geometrical arrangement
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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Abstract
The application provides a spatial light modulation device, a spatial light modulation method and an optical switch, relates to the technical field of optical communication, and can reduce resource occupation of image signal transmission and image processing calculated amount and improve signal transmission speed on the basis of realizing the conventional spatial light modulation function. The spatial light modulation device comprises an information data generation module, wherein the information data generation module comprises a function generator connected with the system interface, and performs function operation on data information input by the system interface to obtain adjustment information with image data; the light modulation device further comprises a light modulation element, wherein the light modulation element comprises a plurality of pixel electrodes and a driving circuit, the pixel electrodes are arranged in a matrix mode, and the driving circuit configures each pixel electrode according to the adjustment information to output modulation signal light.
Description
Technical Field
The present application relates to the field of optical communication technologies, and in particular, to a spatial light modulation device, a spatial light modulation method, and an optical switch.
Background
Optical Communication (Optical Communication) is a Communication method using an Optical wave as a carrier. The dynamic optical network requires the device to provide the configurable function based on the wavelength, and the reconfigurable optical add-drop multiplexing (ROADM) is characterized in that the wavelength can be assigned through software to realize the scheduling of the service and the wavelength. ROADM devices can implement connections between any two points through software configuration and automatic power balancing.
WSS (Wavelength Selective Switch) is used as an optical switching device. The light modulation element in the WSS device may be, for example, a reflective liquid crystal element such as an LCoS (liquid crystal on Silicon) element in which a plurality of pixel regions of reflective pixel electrodes are arranged in the horizontal direction and the vertical direction. The refractive index of the liquid crystal on each pixel electrode changes according to the magnitude of the voltage applied to the pixel electrode. Parameters such as the phase velocity of the signal light at the corresponding pixel position are controlled by changing the refractive index of the liquid crystal of each pixel electrode.
In the prior art, for processing such as transmission and wavelength assignment of image signals, it is necessary to first receive pre-generated image source information and then modulate the image source information, and since the image source information carries more data, the data transmission amount is large, the occupied bandwidth is high, the occupation of computing resources is large, and the physical area is also large, correspondingly, when processing the image information in an image processor, because the computation amount is large, an FPGA (Field Programmable Gate Array) or a driving IC (driving integrated circuit) is required to be used for processing, which results in that the structure of the whole optical modulation element is difficult to be further miniaturized.
Disclosure of Invention
An object of the embodiments of the present invention is to provide a spatial light modulation device, a spatial light modulation method, and an optical switch, which can reduce resource occupation of image signal transmission and a calculation amount of image processing and improve a signal transmission speed on the basis of realizing an existing spatial light modulation function.
In one aspect of the embodiments of the present application, a spatial light modulation device is provided, which includes an information data generation module, where the information data generation module includes a function generator connected to a system interface, and performs a function operation on data information input by the system interface to obtain adjustment information with image data; the light modulation device further comprises a light modulation element, wherein the light modulation element comprises a plurality of pixel electrodes and a driving circuit, the pixel electrodes are arranged in a matrix mode, and the driving circuit configures each pixel electrode according to the adjustment information to output modulation signal light.
Alternatively, the driving circuit controls the signal light to deflect the corresponding angle according to the adjustment information with the image data.
Optionally, the adjustment information with the image data includes voltage value information for adjusting a pixel electrode of the light modulation element to modulate a deflection angle of the signal light by the voltage value.
Alternatively, the light modulation element is a reflective liquid crystal element, a transmissive liquid crystal element, or a micro electro mechanical system device.
Optionally, the information data generation module is integrated in the optical modulation element, or the information data generation module is an embedded system and is in signal connection with the optical modulation element.
In another aspect of the embodiments of the present application, a spatial light modulation method is provided, including: receiving data information, and performing function operation on the data information to obtain adjustment information with image data; determining deflection angles of the signal light according to the adjustment information, wherein the deflection angles of the signal light include N +1, and the N +1 deflection angles include N deflection angles and 1 rejection angle of the optical signal, wherein N is an integer greater than or equal to 1; the signal light is modulated by the optical modulation element, and is deflected at a deflection angle to be output to form modulated signal light.
Optionally, the data information includes a mapping relationship between the signal light and a pixel unit of the light modulation element.
In another aspect of the embodiments of the present application, there is provided an optical switch, including any one of the spatial light modulation devices described above, where the optical switch is a multi-channel optical switch with K × M × N, where K is the number of subswitches included, M is the number of input signal channels, M is an integer greater than or equal to 1, N is the number of output channel channels, and N is an integer greater than or equal to 1, and each output channel is configured to output modulated signal light of the same group of pixel units in the spatial light modulation device.
According to the spatial light modulation device, the spatial light modulation method and the optical switch, the spatial light modulation device comprises an information data generation module and a light modulation element, the information data generation module comprises a function generator connected with a system interface, the function generator generates a function according to a preset requirement, and adjustment information with image data can be obtained by performing function operation on data information input by the system interface; the light modulation element comprises a plurality of pixel electrodes arranged in a matrix manner and a driving circuit correspondingly controlling the pixel electrodes, each pixel electrode corresponds to one pixel unit of the pixel area, and the driving circuit correspondingly configures each pixel electrode according to the adjustment information, so that the light modulation element correspondingly adjusts the light signal corresponding to each pixel electrode to output corresponding modulation signal light. The data information input through the system interface does not need to be image source information which carries huge information amount and operation amount, and only needs to comprise the mapping relation between the optical signal and the pixel unit of the optical modulation element, so the system interface can adopt a conventional interface with smaller bandwidth occupation, the data information is input into a function generator through the system interface to carry out function operation, the adjustment information with image data can be obtained, the adjustment information corresponding to each pixel electrode modulates the signal light through the pixel electrode, and a plurality of pixel electrodes arranged in a matrix in the optical modulation element correspondingly output the modulation signal light. The function operation calculation amount in the function generator is small, the occupation amount of calculation resources in the optical modulation device can be effectively reduced, and the calculation and signal transmission speed is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and that those skilled in the art can also obtain other related drawings based on the drawings without inventive efforts.
FIG. 1 is a schematic diagram of a hierarchical structure of a liquid crystal on silicon device;
FIG. 2 is a schematic block diagram of a prior art liquid crystal on silicon based device for image signal transmission and modulation;
fig. 3 is a schematic block diagram of a spatial light modulation device according to an embodiment of the present application;
fig. 4 is a flowchart of a spatial light modulation method according to an embodiment of the present application;
fig. 5 is a second flowchart of a spatial light modulation method according to an embodiment of the present application.
Icon: 01-a drive substrate; 02-liquid crystal layer; 03-a transparent substrate; 10-an information data generating module; 11-a system interface; 12-function generator; 20-light modulation elements.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application.
In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when using, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
It should also be noted that, unless expressly stated or limited otherwise, the terms "disposed" and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
As for the optical modulation element in WSS, a silicon-based liquid crystal element as a reflective liquid crystal element is exemplified, fig. 1 is a schematic diagram of a hierarchical structure of a liquid crystal on silicon device, as shown in fig. 1, which generally includes a driving substrate 01, a liquid crystal layer 02 and a transparent substrate 03, so that the liquid crystal layer 02 is sealed between the driving substrate 01 and the transparent substrate 03, a plurality of pixel electrodes are arranged in a matrix on the driving substrate 01 in corresponding pixel regions, each pixel electrode corresponding to a pixel unit, of course, a common electrode layer (not shown in fig. 1) formed by a transparent conductive material is further included, a voltage value of the pixel electrode on the driving substrate 01 is controlled, the rotation of the liquid crystal layer 02 corresponding to the liquid crystal in the pixel cell can be controlled by the electric field, due to the birefringence effect of the liquid crystal molecular material, different tilt angles of the liquid crystal molecular material mean different birefringence and optical path lengths. Therefore, when the incident light signal enters different pixel unit positions corresponding to the liquid crystal layer 02, different optical phase retardation amounts are generated in the respective pixel units due to different voltages loaded in the respective pixel units, thereby realizing modulation of parameters such as the spatial phase or the wavelength of the incident light signal.
Fig. 2 is a schematic block diagram of image signal transmission and modulation performed by a liquid crystal on silicon device in the prior art, and as shown in fig. 2, in the prior art, for processing such as transmission and wavelength assignment of an image signal, it is necessary to first receive image source information, which may also be referred to as image data, and then modulate the received image source information in an image processor, for example, speed increase, wavelength adjustment, or processing performed to reduce the fringe field effect, and the modulated signal is written into the liquid crystal on silicon device via an FPGA or a driver IC.
Because the pre-generated image source information carries more information and has large data transmission quantity, the image source information can occupy larger bandwidth during transmission, and the processing calculation in modulation can also occupy more calculation resources, in order to support the corresponding calculation capacity, the image processing often needs to be processed by adopting an FPGA or a drive IC, and the image processing can occupy larger physical area in the FPGA or the drive IC, so that the whole device structure is difficult to miniaturize. If further processing and optimization are performed on the image signal to improve the modulation performance or the modulation effect, the computational load is further increased.
In one aspect of the embodiments of the present application, a spatial light modulation device is provided, and fig. 3 is a schematic block diagram of the spatial light modulation device provided in the embodiments of the present application, as shown in fig. 3, the spatial light modulation device provided in the embodiments of the present application includes an information data generation module 10, where the information data generation module 10 includes a function generator 12 connected to a system interface 11, and performs a function operation on data information input by the system interface 11 to obtain adjustment information with image data; the display device further comprises a light modulation element 20, wherein the light modulation element 20 comprises a plurality of pixel electrodes arranged in a matrix and a driving circuit, and the driving circuit configures each pixel electrode according to the adjustment information to output modulation signal light.
The optical modulation element 20 may interconvert, modulate, or otherwise logically manipulate optical signals in an optical transmission line or integrated optical circuit. The light modulation element 20 in the present embodiment includes a plurality of pixel electrodes arranged in a matrix. The information data generating module 10 firstly inputs external data information through the system interface 11, in the present embodiment, the externally input data information may only include basic data information such as a mapping relationship between an optical signal and a pixel unit of the optical modulation element 20, and does not need to transmit image information with a large information amount, a function algorithm is generated in the function generator 12, and the data information input through the system interface 11 is subjected to operation of the generated function in the function generator 12 to obtain adjustment information with image data, so that the image data can be directly obtained through function operation without being transmitted externally, the adjustment information with image data corresponds to an output window of the optical modulation element 20, for example, the adjustment information may be a pixel unit, or may be a set including a plurality of pixel units divided by a preset rule, the mapping relationship can be determined according to externally input data information, and the adjustment information is used to perform corresponding modulation and processing on the image data in the pixel unit to obtain a modulation signal corresponding to the pixel unit, so as to obtain a modulation signal light output by the light modulation element 20.
The spatial light modulation device provided by the embodiment of the application comprises an information data generation module 10 and a light modulation element 20, wherein the information data generation module 10 comprises a function generator 12 connected with a system interface 11, the function generator 12 generates a function according to a preset requirement, and the adjustment information with image data can be obtained by performing function operation on data information input by the system interface 11; the light modulation element 20 includes a plurality of pixel electrodes arranged in a matrix and a driving circuit for correspondingly controlling the pixel electrodes, each pixel electrode corresponds to one pixel unit of the pixel region, and the driving circuit correspondingly configures each pixel electrode according to the adjustment information, so that the light modulation element 20 correspondingly adjusts the light signal corresponding to each pixel electrode to output corresponding modulation signal light. The data information input through the system interface 11 does not need to be image source information, which is information carrying huge information amount and operation amount, and only needs to include at least the mapping relation between the optical signal and the pixel unit of the optical modulation element, so the system interface 11 can adopt a conventional interface with smaller bandwidth occupation, the data information is input into the function generator 12 through the system interface 11 to perform function operation, the adjustment information with image data can be obtained, the adjustment information corresponding to each pixel electrode is modulated through the pixel electrode to the signal light, and a plurality of pixel electrodes arranged in a matrix in the optical modulation element 20 correspondingly output the modulated signal light. The function operation calculation amount in the function generator 12 is small, the occupation amount of calculation resources in the optical modulation device can be effectively reduced, and the calculation and signal transmission speed is improved.
Alternatively, the drive circuit controls the signal light to deflect the corresponding angle according to the adjustment information with the image data calculated by the function generator 12.
The adjustment information with the image data includes voltage value information for adjusting the pixel electrode of the light modulation element 20 to modulate the deflection angle of the signal light by the voltage value.
Still taking the optical modulation element 20 as an example of a liquid crystal on silicon element, the driving circuit controls the pixel electrode to make the liquid crystal corresponding to the pixel unit in the liquid crystal on silicon element generate corresponding deflection, so that the optical signal output by the pixel unit generates deflection in a preset direction and angle, and the optical signal corresponding to each pixel unit respectively performs deflection in a corresponding direction and angle according to the adjustment information obtained by the operation of the data information in the function generator 12, so as to realize corresponding modulation on image data and correspondingly output through the liquid crystal on silicon element.
In the liquid crystal on silicon element, what is used to deflect the signal light by the corresponding angle is the liquid crystal layer in the liquid crystal on silicon element, and of course, if the light modulation element 20 is a transmissive liquid crystal element, what is used to deflect the signal light by the corresponding angle may also be the liquid crystal layer in the transmissive liquid crystal element.
The function generated by the function generator 12 may be a one-dimensional grating function corresponding to the control of the liquid crystal layer in the liquid crystal on silicon element, the adjustment information with image data obtained after the data information is subjected to the function calculation of the one-dimensional grating function includes voltage value information for adjusting the pixel electrode of the light modulation element 20, and different voltage value information can drive the liquid crystal to form corresponding rotation, thereby realizing the modulation of the image data written in the light modulation element 20.
One or more functions may be generated by the function generator 12. If only one-dimensional grating function is included in the function generator 12, the one-dimensional grating function sequentially calculates voltage value information corresponding to each pixel electrode of the light modulation element 20 according to data information input from the system interface 11, and writes the voltage value information into the light modulation element 20 in sequence. That is, the information obtained by the direct calculation of the one-dimensional grating function includes voltage value information for deflecting the liquid crystal in the corresponding direction and angle to deflect the optical signal in the corresponding angle, and the optical signal deflects the corresponding angle according to the rotation of the liquid crystal to output the modulated signal light.
For another example, if the function generator 12 includes a plurality of one-dimensional grating functions, each of the plurality of one-dimensional grating functions receives data information input from the system interface 11 and calculates adjustment information including image data, the plurality of one-dimensional grating functions and the adjustment information including image data obtained by calculation correspond to different positions of the light modulator 20, respectively, and are output from corresponding pixel units to form modulated signal light.
Alternatively, the light modulation element 20 is any one of a reflective liquid crystal element, a transmissive liquid crystal element, or a micro electro mechanical system device.
The optical modulation element 20 is configured to respond to the adjustment information with image data generated by the information data generation module 10, obtain and output a modulated optical signal in a corresponding modulation mode. The light modulation element 20 may commonly include a reflective liquid crystal element, a transmissive liquid crystal element, or a micro electro mechanical system device.
The transmissive liquid crystal element and the reflective liquid crystal element modulate transmitted light signals in accordance with a voltage-controlled liquid crystal deflection, and are different in that the transmissive liquid crystal element outputs modulated signal light in a transmissive manner and the reflective liquid crystal element outputs modulated signal light in a reflective manner. Micro-Electro-Mechanical systems (MEMS) devices also control the deflection angle of the micromirror to modulate the signal light.
The liquid crystal on silicon element taken as an example in the specification of the present application belongs to one of reflective liquid crystal elements, and due to the characteristics of a liquid crystal material and the birefringence effect, an electric field acting on liquid crystal can be changed by adjusting a voltage value of a pixel electrode, so that the birefringence and the optical path of the liquid crystal are changed, and further, corresponding modulation is performed on an optical signal, and therefore, the reflective liquid crystal element is adopted as an optical modulation element, especially, the liquid crystal on silicon element is selected, and the reliability and the modulation accuracy of the liquid crystal on silicon element can be well ensured.
Alternatively, the information data generation module 10 is integrated in the light modulation element 20, or the information data generation module 10 is integrated in an embedded system and is in signal connection with the light modulation element 20.
Taking the optical modulation element 20 as an example of a liquid crystal on silicon element, as shown in fig. 1, it has been pointed out in the foregoing description that the liquid crystal on silicon element includes a driving substrate 01, the driving substrate 01 includes a driving module, and the electric field variation in the corresponding pixel unit is controlled by the driving module, in this scheme, the information amount of the data information inputted from the outside is small, and the operation amount of the function operation in the function generator 12 is not large, so that the data amount of the signal transmission is reduced, the response speed is increased, and the calculation resource of the system is also saved, therefore, the information data generating module 10 can be integrated into the driving module of the liquid crystal on silicon element, so that the calculation and transmission of the data are both directly written in the liquid crystal on silicon element, the possible problems of speed limit and the like in the transmission through an off-chip interface are avoided, and the information transmission speed is further increased, and simultaneously, the device structure can be compact and miniaturized.
Alternatively, the information data generating module 10 may also be an embedded system, and is in Signal connection with the optical modulation element 20, and the function calculation is transmitted to the optical modulation element 20 after being calculated in the embedded system, where the embedded system may adopt an FPGA (Field Programmable Gate Array), an MCU (micro controller Unit), or a DSP (Digital Signal Processing) device.
In another aspect of the embodiments of the present application, a spatial light modulation method is provided, fig. 4 is a flowchart of the spatial light modulation method provided in the embodiments of the present application, and please refer to fig. 4, the spatial light modulation method includes:
s101, receiving data information, and performing function operation on the data information to obtain adjustment information with image data.
And S102, correspondingly generating modulated signal light according to the adjustment information.
According to the spatial light modulation method, data information is received at first, the data information does not need to be image source information which carries huge information and computation, function operation is conducted on the received data information, and adjustment information with image data is obtained through the function operation. The adjustment information with image data is arranged for each pixel unit, and the plurality of pixel units correspondingly generate modulated signal light according to the adjustment information.
The received data information does not need image source information which carries huge information quantity and operation quantity, the resource occupation quantity of function operation of the data information is small, the adjustment information with the image data can be obtained through the function operation of the data information, and the modulation signal light can be correspondingly generated according to the adjustment information.
Alternatively, the data information includes at least a mapping relationship between the signal light and the pixel unit of the light modulation element 20. The mapping relationship between the signal light and the pixel unit of the light modulation element 20 enables the adjustment information with image data obtained after function operation to go to the corresponding pixel unit according to the mapping relationship, the adjustment information includes voltage value information, and the driving circuit can respond to the voltage value information, so that the pixel electrode of the pixel unit drives the liquid crystal to realize corresponding rotation by the voltage value, so that the light signal is correspondingly modulated, and the modulated signal light is obtained.
Optionally, fig. 5 is a second flowchart of the spatial light modulation method according to the embodiment of the present application, and as shown in fig. 5, the step S102 of correspondingly generating the modulated signal light according to the adjustment information includes:
s1021, determining the deflection angle of the signal light according to the adjustment information;
s1022, the signal light is modulated by the optical modulator 20, and the signal light is deflected at a deflection angle and output to form modulated signal light.
The light modulation element 20 controls the rotation of the liquid crystal by the voltage signal to make the liquid crystal form a corresponding grating arrangement, thereby realizing the modulation of the deflection angle of the passing signal light. Based on the liquid crystal on silicon element, firstly, the deflection angle required for obtaining the modulation signal light is determined according to the adjustment information, and then the rotation of the liquid crystal is controlled by giving the voltage value information to the pixel electrode, so that the light modulation element 20 realizes the corresponding deflection of the angle of the signal light, and the output modulation signal light is obtained.
Optionally, the deflection angles of the signal light include N +1, and the N +1 deflection angles include N deflection angles of the light signal and 1 rejection angle, where N is an integer greater than or equal to 1.
In the liquid crystal on silicon element, the number and arrangement position of the pixel units can be fixed according to the communication protocol, then, for each pixel unit, for the modulation of the passing light signal, N different deflection angles and 1 discarding angle can be included, that is, corresponding to the pixel unit, N +1 modulation choices can be provided, the adjustment information with image data obtained by the function operation can include a selection signal for specifying one of the N +1, then the selection signal can determine which specific deflection angle corresponds to the N +1, the light signal output by the pixel unit is modulated and output as the deflection angle selected by one of the modulation choices by controlling the rotation of the liquid crystal, or the adjustment information with image data obtained by the function operation can directly include the deflection signal of one of the N +1 angles, and controlling the rotation of the liquid crystal directly according to the deflection signal so that the optical signal output by the pixel unit correspondingly deflects and outputs the modulation signal light, and when the discarding angle is selected, the optical signal corresponding to the pixel unit is discarded, and the pixel unit does not output the optical signal.
In another aspect of the embodiments of the present application, there is provided a multi-channel optical switch of K × M × N, to which any one of the spatial light modulation devices is applied, wherein K is the number of sub-switches included in the optical switch, M is the number of input channel channels, M is an integer greater than or equal to 1, N is the number of output channel channels, N is an integer greater than or equal to 1, and each output channel is used for outputting modulated signal light of the same group of pixel units in the spatial light modulation device.
The input channel and the output channel of the optical switch are both arranged in a bar shape, and therefore, a group of pixel cells in the spatial light modulation device may correspond to the bar shape, so that the liquid crystal in the range of the pixel cell group corresponding to the bar shape is rotated to correspond to the output channel.
In addition, the present application may also be applied to the adjustment of the outgoing optical signal of other Diffractive Optical Elements (DOEs), and the apparatus and method of the embodiments of the present application may be applied to the optical modulation of the DOE, and in the optical modulation application of the DOE, the voltage distribution modulated in the DOE needs to be designed and set correspondingly with reference to the foregoing description of the specification.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (8)
1. A spatial light modulation device, comprising:
the information data generation module comprises a function generator connected with the system interface and is used for carrying out function operation on the data information input by the system interface to obtain adjustment information with image data;
and the light modulation element comprises a plurality of pixel electrodes and a driving circuit which are arranged in a matrix, wherein the driving circuit configures each pixel electrode according to the adjustment information so as to output modulation signal light.
2. The spatial light modulation device according to claim 1, wherein the drive circuit controls the signal light to deflect a corresponding angle according to the adjustment information with the image data.
3. The spatial light modulation device according to claim 2, wherein the adjustment information with the image data includes voltage value information for adjusting a pixel electrode of the light modulation element to modulate a deflection angle of the signal light by the voltage value.
4. The spatial light modulation device according to claim 1, wherein the light modulation element is a reflective liquid crystal element, a transmissive liquid crystal element, or a micro electro mechanical system device.
5. The spatial light modulator device according to claim 1, wherein the information data generating module is integrated in the light modulator element, or the information data generating module is an embedded system and is in signal connection with the light modulator element.
6. A method of spatial light modulation, comprising:
receiving data information, and performing function operation on the data information to obtain adjustment information with image data;
determining deflection angles of the signal light according to the adjustment information, wherein the deflection angles of the signal light include N +1, the N +1 deflection angles include N deflection angles of the optical signal and 1 discarding angle, and N is an integer greater than or equal to 1;
and modulating the signal light through an optical modulation element, so that the signal light is deflected at the deflection angle and output to form the modulated signal light.
7. The method of claim 6,
the data information includes a mapping relationship between the signal light and pixel units of the light modulation element.
8. An optical switch comprising the spatial light modulation device according to any one of claims 1 to 5, wherein the optical switch is a multi-channel optical switch of K x M x N, where K is the number of subswitches included, M is the number of input channel channels, M is an integer equal to or greater than 1, N is the number of output channel channels, and N is an integer equal to or greater than 1, and each of the output channel channels is configured to output the modulated signal light of the same group of pixel cells in the spatial light modulation device.
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| CN202011220084.1A CN112039625B (en) | 2020-11-05 | 2020-11-05 | Spatial light modulation device, spatial light modulation method, and optical switch |
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| CN113867013A (en) * | 2021-09-02 | 2021-12-31 | 帛度光电科技(苏州)有限公司 | Spatial light modulator and system |
| CN114205691A (en) * | 2021-01-22 | 2022-03-18 | 西安奇芯光电科技有限公司 | Optical routing framework and routing chip |
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