CN109891305B - LCoS phase calibration method and equipment - Google Patents
LCoS phase calibration method and equipment Download PDFInfo
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- CN109891305B CN109891305B CN201680090538.3A CN201680090538A CN109891305B CN 109891305 B CN109891305 B CN 109891305B CN 201680090538 A CN201680090538 A CN 201680090538A CN 109891305 B CN109891305 B CN 109891305B
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- 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
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- 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
Abstract
A method and a device for LCoS phase calibration comprise the following steps: loading the same gray value on each pixel point of the LCoS, acquiring phase modulation amounts respectively corresponding to different gray values loaded for multiple times to obtain an initial response relation, and combining a target response relation to obtain an initial gray value corresponding relation; determining K input gray values corresponding to the phase modulation amount change period K according to a preset gray value range corresponding to the target response relation, and determining K output gray values corresponding to the K input gray values according to the initial gray value corresponding relation; loading corresponding output gray values on K pixel points corresponding to a phase modulation amount change period K to obtain an actual phase modulation depth value, and determining a corrected phase modulation depth value and a corrected target response relation by combining a target phase modulation depth value corresponding to the target response relation; and obtaining a gray value corresponding relation corresponding to the phase modulation variable variation period K according to the initial response relation and the corrected target response relation.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to a method and equipment for calibrating a liquid crystal on silicon (LCoS) phase.
Background
LCoS (Liquid Crystal on Silicon ) was used as a spatial intensity modulator, and was primarily used in the image display field in the early days for image processing, display, encoding, and the like. With the development of LCoS research, LCoS is gradually applied to the field of optical communication as a spatial phase modulator in recent years.
Calibration of the LCoS phase by way of a LUT (Look Up Table) is a commonly known technique in the industry, but the conventional method has a certain phase error.
The following are two schemes proposed in the prior art to compensate for phase error:
scheme 1: aiming at the phase error caused by the uneven thickness of the LCoS, the LCoS is divided into a plurality of areas, an LUT (look up table) corresponding to each area is obtained and is used for carrying out phase calibration on the corresponding area, and the scheme can effectively compensate the phase error caused by the uneven thickness of the LCoS.
Scheme 2: and the wavelength correlation is considered, different LUTs corresponding to different wavelength areas are obtained, phase errors caused by different wavelength areas are compensated, and phase errors caused by nonuniform thickness of the LCoS are also compensated.
However, the two schemes have very limited effect in practical application because of the following two reasons:
1) with the continuous improvement of the LCoS process technology, the thickness error of the current commercial LCoS is within 0.5 percent, so the phase error caused by uneven thickness of the LCoS is very small;
2) when the LCoS is applied in WSS (Wavelength selective switch), the Wavelength range covered by WSS is usually in C-band (i.e. 1529nm-1562nm), so the phase error caused by the Wavelength dependency is very small.
In simulation, it is found that when the phase adjustment amount change period of the LCoS is short, crosstalk between pixels has a large influence, the actual phase modulation depth is lower than the target phase modulation depth, and a phase error is large. In addition, with the continuous evolution of the LCoS technology, the resolution of the LCoS is continuously improved, and the pixel size is continuously reduced. For example, the pixel size of the currently commercially available communication band LCoS is usually 8um (resolution is 1920 × 1080), while the pixel size of the next generation LCoS will likely be reduced to around 4um (resolution will reach 4k × 2 k). Thus, this effect will be more pronounced as the pixel size of LCoS decreases in the future.
Disclosure of Invention
The embodiment of the invention provides a method and equipment for LCoS phase calibration, which are used for solving the problem of large phase error caused by short change period of a phase adjustment volume.
The embodiment of the invention provides the following specific technical scheme:
in a first aspect, a method for LCoS phase calibration includes: loading the same gray value on each pixel point of the LCoS, acquiring phase modulation amounts respectively corresponding to different gray values loaded for multiple times to obtain an initial response relation, and obtaining an initial gray value corresponding relation according to the initial response relation and a target response relation corresponding to a phase modulation amount change period K, wherein K is a positive integer; further, determining K input gray values corresponding to the phase modulation amount change period K according to a preset gray value range corresponding to the target response relationship, and determining K output gray values corresponding to the K input gray values according to the initial gray value corresponding relationship; next, loading corresponding output gray values on K pixel points corresponding to a phase modulation amount change period K respectively to obtain an actual phase modulation depth value corresponding to the phase modulation amount change period K; determining a corrected phase modulation depth value and a corrected target response relation based on the actual phase modulation depth value and a target phase modulation depth value corresponding to the target response relation; and finally, obtaining a gray value corresponding relation corresponding to the phase modulation variable variation period K according to the initial response relation and the corrected target response relation.
Therefore, the method provided by the embodiment of the invention can correct the phase errors respectively corresponding to the change periods of different phase adjustment quantities, and effectively reduce the crosstalk influence between pixels in the LCoS, and particularly, the method provided by the embodiment of the invention has a remarkable effect on solving the crosstalk influence between pixels of next generation ultra-small pixels.
In a possible implementation manner, the gray-level value and the phase adjustment amount in the target response relationship are in a preset linear variation relationship.
Therefore, the target response relation can be set according to the actual application requirement.
In a possible implementation manner, the initial gray-level value correspondence relationship refers to a correspondence relationship between an input gray-level value and an output gray-level value under any one same phase adjustment amount, where the input gray-level value refers to a gray-level value in the target response relationship, and the output gray-level value refers to a gray-level value in the initial response relationship.
Therefore, the initial gray value correspondence can describe the relationship between the target response relationship and the initial response relationship.
In one possible implementation, the modified phase modulation depth value is determined by the following formula: a is2B is the ratio of the total weight of the components to the total weight of the components. Wherein c is the corrected phase modulation depth value, a is the target phase modulation depth value, and b is the actual phase modulation depth value. And the corrected target response relation is determined according to the corrected phase modulation depth value and the preset gray value range.
Therefore, the method provided by the embodiment of the invention can be used for simply and conveniently determining the corrected phase modulation depth value and the corrected target response relation.
In a possible implementation manner, loading corresponding output gray values on K pixel points corresponding to a phase modulation amount change period K, respectively, to obtain an actual phase modulation depth value corresponding to the phase modulation amount change period K, includes: and obtaining voltage values corresponding to the K output gray values respectively, wherein each output gray value corresponds to one voltage value, and sequentially loading voltage signals corresponding to the K voltage values to K pixel points corresponding to the phase modulation amount change period K according to the voltage values corresponding to the K output gray values respectively. And finally, determining the actual phase modulation depth value corresponding to the phase modulation change period K according to the phase modulation amount corresponding to the K pixel points respectively.
Therefore, the method provided by the embodiment of the invention can simply and conveniently obtain the actual phase modulation depth value corresponding to each phase adjustment variable change period without increasing any hardware cost, is simple and convenient to operate and saves the cost.
In a possible implementation manner, when determining an actual phase modulation depth value corresponding to the phase modulation change period K according to the phase adjustment amounts corresponding to the K pixel points, the actual phase modulation depth value is determined by using the following formula:
wherein b is the actual phase modulation depth value, P1 is the maximum value among the phase adjustment amounts respectively corresponding to the K pixel points, and P2 is the minimum value among the phase adjustment amounts respectively corresponding to the K pixel points.
Therefore, the method provided by the embodiment of the invention can be used for simply and conveniently determining the actual phase modulation depth value.
In a possible implementation manner, the gray-level value corresponding relationship corresponding to the phase modulation amount variation cycle K refers to a corresponding relationship between an input gray-level value after correction and an output gray-level value after correction under any one same phase modulation amount, where the input gray-level value after correction refers to a gray-level value in the target response relationship after correction, and the output gray-level value refers to a gray-level value in the initial response relationship.
In a possible implementation manner, after obtaining a gray-level value corresponding relationship corresponding to the phase modulation amount variation cycle K according to the initial response relationship and the corrected target response relationship, the method further includes: and storing the gray value corresponding relation corresponding to the phase modulation change period K into a storage area of the LCoS, so that when the LCoS loads a blazed grating of the phase modulation change period K, corresponding corrected output gray values are loaded on K pixel points corresponding to the phase modulation change period K respectively according to the gray value corresponding relation corresponding to the phase modulation change period K.
Therefore, the method provided by the embodiment of the present invention can obtain LUTs corresponding to a plurality of phase modulation amount change periods, respectively, and when the LCoS loads blazed gratings of different phase modulation amount change periods, corresponding corrected output gray values are loaded on the pixel points corresponding to the phase modulation amount change periods, respectively, according to the gray value correspondence corresponding to each phase modulation amount change period.
In a second aspect, an LCoS phase calibration apparatus includes: a communication interface and a processor coupled to the communication interface; the processor is configured to: loading the same gray value on each pixel point of the LCoS through the communication interface, and acquiring phase modulation amounts respectively corresponding to different gray values loaded for multiple times to obtain an initial response relation; obtaining an initial gray value corresponding relation according to the initial response relation and a target response relation corresponding to the phase modulation amount change period K, wherein K is a positive integer; determining K input gray values corresponding to the phase modulation amount change period K according to a preset gray value range corresponding to the target response relationship, and determining K output gray values corresponding to the K input gray values according to the initial gray value corresponding relationship; loading corresponding output gray values on K pixel points corresponding to a phase modulation amount change period K through the communication interface respectively to obtain an actual phase modulation depth value corresponding to the phase modulation amount change period K; determining a corrected phase modulation depth value and a corrected target response relation based on the actual phase modulation depth value and a target phase modulation depth value corresponding to the target response relation; and obtaining a gray value corresponding relation corresponding to the phase modulation variable variation period K according to the initial response relation and the corrected target response relation.
In a possible implementation manner, the gray-level value and the phase adjustment amount in the target response relationship are in a preset linear variation relationship.
In a possible implementation manner, the initial gray-level value correspondence relationship refers to a correspondence relationship between an input gray-level value and an output gray-level value under any one same phase adjustment amount, where the input gray-level value refers to a gray-level value in the target response relationship, and the output gray-level value refers to a gray-level value in the initial response relationship.
In one possible implementation, the modified phase modulation depth value is determined by the following formula:
c＝a2/b
wherein c is the corrected phase modulation depth value, a is the target phase modulation depth value, and b is the actual phase modulation depth value;
and the corrected target response relation is determined according to the corrected phase modulation depth value and the preset gray value range.
In one possible implementation, the processor is specifically configured to:
loading corresponding output gray values on K pixel points corresponding to a phase modulation amount change period K respectively, and obtaining voltage values corresponding to the K output gray values respectively when obtaining an actual phase modulation depth value corresponding to the phase modulation amount change period K, wherein each output gray value corresponds to one voltage value;
according to the voltage values corresponding to the K output gray values, sequentially loading voltage signals corresponding to the K voltage values to K pixel points corresponding to the phase modulation amount change period K through the communication interface;
measuring phase modulation amounts corresponding to K pixel points after the voltage signal is loaded;
and determining the actual phase modulation depth value corresponding to the phase modulation change period K according to the phase modulation amount corresponding to the K pixel points respectively.
In a possible implementation manner, when the processor determines an actual phase modulation depth value corresponding to the phase modulation change period K according to the phase adjustment amounts corresponding to the K pixel points, the actual phase modulation depth value is determined by using the following formula:
wherein b is the actual phase modulation depth value, P1 is the maximum value among the phase adjustment amounts respectively corresponding to the K pixel points, and P2 is the minimum value among the phase adjustment amounts respectively corresponding to the K pixel points.
In a possible implementation manner, the gray-level value corresponding relationship corresponding to the phase modulation amount variation cycle K refers to a corresponding relationship between an input gray-level value after correction and an output gray-level value after correction under any one same phase modulation amount, where the input gray-level value after correction refers to a gray-level value in the target response relationship after correction, and the output gray-level value refers to a gray-level value in the initial response relationship.
In one possible implementation, the processor is further configured to:
after the gray value corresponding relation corresponding to the phase modulation amount change period K is obtained according to the initial response relation and the corrected target response relation, the gray value corresponding relation corresponding to the phase modulation amount change period K is stored in a storage area of the LCoS, so that when the blazed grating of the phase modulation amount change period K is loaded on the LCoS, corresponding corrected output gray values are loaded on K pixel points corresponding to the phase modulation amount change period K respectively according to the gray value corresponding relation corresponding to the phase modulation amount change period K.
Drawings
Fig. 1 is a schematic structural diagram of an LCoS in an embodiment of the present invention;
fig. 2(a) is one of schematic diagrams of the working principle of implementing phase modulation by an LCoS in the embodiment of the present invention;
fig. 2(b) is a second schematic diagram illustrating the operation principle of the LCoS for implementing phase modulation in the embodiment of the present invention;
FIG. 3 is a typical response curve of LCoS loading voltage versus phase modulation amount in an embodiment of the present invention;
FIG. 4 is a graph illustrating a target gray phase response according to an embodiment of the present invention;
FIG. 5 is a schematic structural diagram of a WSS device in an embodiment of the present invention;
FIG. 6(a) is a schematic diagram illustrating a variation cycle of the phase adjustment amount in the embodiment of the present invention;
FIG. 6(b) is a schematic diagram illustrating the variation period of the phase adjustment value in the embodiment of the present invention;
FIG. 7 is a flowchart illustrating an overview of a method for LCoS phase calibration according to an embodiment of the present invention;
FIG. 8 is an initial gray scale phase response curve according to an embodiment of the present invention;
FIG. 9 is a diagram of an input gray-level distribution with a phase adjustment variation period of 8 according to an embodiment of the present invention;
fig. 10 is a schematic diagram of actual phase modulation depth values respectively corresponding to different phase adjustment variable variation periods according to an embodiment of the present invention;
fig. 11 is a schematic diagram of corrected phase modulation depth values corresponding to different phase adjustment variable variation periods according to an embodiment of the present invention;
FIG. 12 is an initial gray scale phase response curve in an embodiment of the present invention;
FIG. 13 is an initial LUT curve in an embodiment of the invention;
fig. 14 is a diagram illustrating an actual phase modulation depth value corresponding to the phase adjustment variation period 8 in the embodiment of the present invention;
FIG. 15 is a diagram illustrating actual phase modulation depth values corresponding to the phase adjustment variation period 24 in an embodiment of the present invention;
fig. 16(a) is a comparison diagram of a corrected target gray-scale phase response curve and an original target gray-scale phase response curve corresponding to the phase adjustment amount variation period 8 in the embodiment of the present invention;
fig. 16(b) is a comparison diagram of the corrected target gray-scale phase response curve and the original target gray-scale phase response curve corresponding to the phase adjustment amount variation period 24 in the embodiment of the present invention;
fig. 17(a) is a corrected target gray scale phase response curve corresponding to the phase adjustment amount variation period 8 in the embodiment of the present invention;
fig. 17(b) is a corrected target gray scale phase response curve corresponding to the phase adjustment variation period 24 in the embodiment of the present invention;
fig. 18 is a schematic structural diagram of an LCoS phase calibration apparatus in an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a method and equipment for LCoS phase calibration, which are used for solving the problem of large phase error caused by short change period of a phase adjustment volume. The method and the device are based on the same inventive concept, and because the principles of solving the problems of the method and the device are similar, the implementation of the device and the method can be mutually referred, and repeated parts are not repeated.
First, a specific structure of the LCoS is described, and as shown in fig. 1, the LCoS includes, in order from top to bottom, a Glass (Glass) layer, an Indium Tin Oxide (ITO) layer, an Alignment (Alignment) layer, a Liquid Crystal (LC) layer, an Alignment (lower) layer, and an aluminum-plated Complementary Metal Oxide Semiconductor (CMOS) substrate (including an aluminum layer and a CMOS layer).
The operation principle of LCoS to realize phase modulation is shown in fig. 2(a) and 2 (b): when the LC layer is not applied with a voltage, the liquid crystal molecules are aligned according to the Alignment layer's Alignment rule, as shown in fig. 2 (a); when the LC layer is applied with a voltage, the liquid crystal molecules are deflected according to the magnitude of the voltage. Since the liquid crystal molecules are birefringent, different turns will produce different equivalent refractive indices. Thus, when incident light passes through the liquid crystal molecules, the different turning of the liquid crystal molecules will achieve a phase modulation effect on the light.
Fig. 3 shows a typical response curve of LCoS loading voltage and phase modulation amount, and it can be seen from fig. 3 that the two are not linearly changing. In practical applications, as shown in fig. 4, a phase response curve of a target gray scale is mainly used, the phase adjustment amount and the input gray scale value are in a linear change relationship, and when the input gray scale value changes from 0 to 255, the change of the generated phase modulation amount is from 0 to 2pi, wherein the magnitude of the input gray scale value corresponds to the magnitude of the voltage value one to one. Therefore, for an LCoS chip without phase calibration, a linear variation relationship as shown in fig. 4 cannot be obtained.
TABLE 1
| Inputting grey scale values | Output |
| 0 | GL-0 |
| 1 | GL-1 |
| … | … |
| 255 | GL-255 |
The common practice is: in order to obtain fig. 4 from fig. 3, it is necessary to generate a LUT (Look-Up Table) containing the correspondence between the input gray values (i.e., the input gray values indicated by the abscissa in fig. 4) and the output gray values as shown in Table 1. Specifically, according to the phase modulation amount corresponding to each input gray scale value in fig. 4, the voltage value corresponding to the phase modulation amount in fig. 3 is determined, and further according to the preset corresponding relationship between the voltage value and the output gray scale value, the output gray scale value corresponding to the voltage value is obtained, that is, the input gray scale value, the output gray scale value, and the voltage value correspond to each other one by one. Therefore, the LUT is obtained to realize that the generated phase modulation amount linearly changes from 0 to 2pi when the input gray scale value changes from 0 to 255.
In particular, as for the WSS device, referring to fig. 5, blazed gratings for different diffraction angles are formed by loading input gray values corresponding to different phase adjustment amount variation periods on different regions of the LCoS, so as to selectively output each wavelength. The magnitude of the phase adjustment variation period determines the diffraction angle of the LCoS as shown in fig. 6(a) and 6 (b).
When the phase adjustment amount change period of the LCoS is fast, crosstalk between pixels has a large influence, so that the phase modulation depth is reduced, and the resulting phase error is large. Therefore, embodiments of the present invention provide a phase calibration method and apparatus to solve the above problems.
In the embodiment of the present invention, the initial response relationship is represented by an initial gray-scale phase response curve, the target response relationship is represented by a target gray-scale phase response curve, the initial gray-scale value correspondence relationship is represented by an initial LUT, and the gray-scale value correspondence relationship corresponding to the phase modulation amount change period K is represented by an LUT corresponding to the phase modulation amount change period K. It should be understood that the concepts described above may also be represented in other forms.
Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Referring to fig. 7, an embodiment of the present invention provides a method for calibrating an LCoS phase, including:
step 700: the calibration equipment loads the same gray value on each pixel point of the LCoS, obtains phase modulation amounts respectively corresponding to different gray values loaded for multiple times, and obtains an initial response relation.
For example, 0, 100, 200, and the like are loaded on each pixel point of the LCoS, and a phase adjustment amount corresponding to each gray value is obtained, so as to obtain an initial gray phase response curve, as shown in fig. 8. The input gray scale value may directly correspond to a voltage value, or an output gray scale value corresponding to each input gray scale value is obtained through a preset LUT, and the output gray scale value is further converted into a corresponding voltage value to be loaded on each pixel point.
Step 710: and the calibration equipment obtains the corresponding relation of the initial gray value according to the initial response relation and the target response relation corresponding to the phase modulation amount change period K, wherein K is a positive integer.
The phase modulation change period K is a phase modulation change period obtained by loading different gray values on each K pixel points, and the phase modulation change period is a phase modulation change period, where K is 8 or 24 in practical application.
Optionally, the gray-scale value and the phase adjustment amount in the target response relationship are in a preset linear variation relationship.
For example, the target gray-scale phase response curve is shown in fig. 4, and the input gray-scale value and the phase modulation amount have a linear variation relationship. It should be noted that, according to actual needs, the target gray-scale phase response curve may not pass through the origin.
Optionally, the initial gray-scale value correspondence relationship is a correspondence relationship between an input gray-scale value and an output gray-scale value under any same phase adjustment amount, where the input gray-scale value is a gray-scale value in the target response relationship, and the output gray-scale value is a gray-scale value in the initial response relationship.
Specifically, the method for obtaining the initial LUT according to the initial gray phase response curve and the target gray phase response curve is similar to the method for obtaining the LUT according to fig. 3 and 4 in the prior art, and is not repeated here.
Step 720: the calibration equipment determines K input gray values corresponding to the phase modulation amount change period K according to a preset gray value range corresponding to the target response relation, and determines K output gray values corresponding to the K input gray values according to the initial gray value corresponding relation.
The preset gray-level value range can be 0-255, or other possible preset gray-level value ranges.
Specifically, each input gray value is determined according to the phase adjustment amount variation period, and then the initial gray value correspondence determined according to step 710 is searched for, and the output gray value corresponding to each input gray value is determined.
Step 730: and the calibration equipment loads corresponding output gray values on K pixel points corresponding to the phase modulation amount change period K respectively to obtain an actual phase modulation depth value corresponding to the phase modulation amount change period K.
Specifically, the calibration device needs to perform the following process: obtaining voltage values corresponding to K output gray values respectively, wherein each output gray value corresponds to one voltage value, sequentially loading voltage signals corresponding to the K voltage values to K pixel points corresponding to a phase modulation amount change period K according to the voltage values corresponding to the K output gray values respectively, measuring the phase modulation amount corresponding to the K pixel points after the voltage signals are loaded, and determining an actual phase modulation depth value corresponding to the phase modulation amount change period K according to the phase modulation amount corresponding to the K pixel points respectively.
Optionally, the actual phase modulation depth value is determined using the following formula:
wherein, b is the actual phase modulation depth value, P1 is the maximum value among the phase adjustment amounts corresponding to the K pixel points respectively, and P2 is the minimum value among the phase adjustment amounts corresponding to the K pixel points respectively.
For example, assuming that the phase adjustment variation period is 8, that is, each 8 pixels is a period, and the preset gray scale value range is 0 to 255, the 8 input gray scale values corresponding to the phase adjustment variation period are: 0. 255/8, 2 x 255/8, … … and 7 x 255/8, see fig. 9. Searching an output gray value corresponding to each input gray value in the initial LUT determined in step 710 according to the obtained 8 input gray values, obtaining voltage values corresponding to the 8 input gray values respectively, sequentially loading voltage signals corresponding to the obtained 8 voltage values onto 8 pixel points, that is, sequentially loading the 8 voltage values onto 8 continuous pixel points in the same row or the same column according to the sequence from large to small or from small to large, and then measuring phase adjustment amounts corresponding to the 8 pixel points after the voltage signals are loaded. Finally, the actual phase modulation depth value is calculated, assuming that p1 is 1.6pi and p2 is 0, then:
as can be seen from the above, the actual phase modulation depth is lower than the target phase modulation depth due to the influence of pixel crosstalk. For example, referring to fig. 10, for different phase adjustment amount variation periods, K1, K2, and K3, the corresponding actual phase modulation depth values are P1, P2, and P3, respectively, and it can be seen from fig. 10 that as the phase adjustment amount variation period is shortened, the actual phase modulation depth decreases. Therefore, it is necessary to determine a corrected phase modulation depth value, a corrected target gray-scale phase response curve, and a corresponding LUT for each phase adjustment amount change period.
Step 740: and the calibration equipment determines the corrected phase modulation depth value and the corrected target response relation based on the actual phase modulation depth value and the target phase modulation depth value corresponding to the target response relation.
Optionally, in executing step 730, the corrected depth value of the phase modulation is determined by using the following formula:
c＝a2/b
wherein c is the corrected phase modulation depth value, a is the target phase modulation depth value, and b is the actual phase modulation depth value.
It should be understood that the modified phase modulation depth value may be around the calculated c value, slightly larger or slightly smaller than the c value.
For example, b ≈ 1.83pi obtained in the above example, and c ≈ 2pi)21.83pi ≈ 2.19 pi. As a result, c may be 2.2pi, 2.15pi, or the like.
Further, the corrected target response relation is determined according to the corrected phase modulation depth value and the preset gray value range.
Referring to fig. 11, in combination with fig. 10, for different phase adjustment change periods, if the gray-scale value ranges from 0 to 255 for K1, K2, and K3, the corrected phase modulation depth values corresponding to the phase adjustment change periods K1, K2, and K3 are 2pi (2pi/P1), 2pi (2pi/P2), and 2pi (2pi/P3), respectively.
Step 750: and the calibration equipment obtains the gray value corresponding relation corresponding to the phase modulation variable variation period K according to the initial response relation and the corrected target response relation.
The gray value corresponding relationship corresponding to the phase modulation amount change period K refers to a corresponding relationship between an input gray value after correction and an output gray value after correction under any one same phase modulation amount, wherein the input gray value after correction refers to a gray value in a target response relationship after correction, and the output gray value refers to a gray value in an initial response relationship.
In addition, after the step 740 is executed, the calibration device may further store the gray value corresponding relationship corresponding to the phase modulation amount change period K in the storage area of the LCoS, so that when the LCoS loads the blazed grating of the phase modulation amount change period K, the corresponding corrected output gray values are loaded on the K pixel points corresponding to the phase modulation amount change period K according to the gray value corresponding relationship corresponding to the phase modulation amount change period K. Therefore, the gray value corresponding relation corresponding to a plurality of groups of phase modulation change periods can be obtained according to the method.
The following describes the implementation of the embodiment of the present invention in detail with reference to a specific embodiment.
Next, how to obtain LUT values corresponding to different phase adjustment amount change periods will be described by taking blazed gratings having phase adjustment amount change periods of 8 and 24 as an example.
Firstly, the calibration device loads the same gray value on each pixel point of the LCoS, and measures the phase modulation amount generated under different gray values to obtain an initial gray phase response curve, as shown in fig. 12. The initial gray scale phase response curve is in nonlinear change, and the target gray scale phase response curve is in linear change.
The calibration device obtains a corresponding relationship between the initial LUT, i.e., the initial gray value, according to the initial gray phase response curve and the target gray phase response curve, as shown in fig. 13, where the abscissa is the input gray value (i.e., the output gray value in the target gray phase response curve), the ordinate is the output gray value (i.e., the input gray value in the initial gray phase response curve), and fig. 13 is obtained according to fig. 12, where the input gray value and the output gray value correspond to the same phase adjustment amount.
Next, since this example desires to form blazed gratings for two diffraction angles by loading the input gray-scale values corresponding to the phase adjustment amount change periods 8 and 24 on the LCoS, and the target phase adjustment depth required for each blazed grating is 2pi, the calibration device loads the corresponding input gray-scale values on the 8 pixel points corresponding to each phase adjustment amount change period 8 of the LCoS according to the initial LUT to obtain 8 phase adjustment amounts, as shown in fig. 14, and calculates that the actual phase modulation depth value corresponding to the phase adjustment amount change period (blazed period) 8 is 1.6 pi. And loading corresponding input gray values on 24 pixel points corresponding to each phase adjustment amount change period 24 of the LCoS according to the initial LUT to obtain 24 phase adjustment amounts, as shown in fig. 15, and calculating to obtain an actual phase modulation depth value corresponding to the phase adjustment amount change period 24 as 1.9 pi. Further, the calibration device determines that the corrected phase modulation depth for the phase adjustment amount change period 8 is 2.5pi and the corrected target phase modulation depth for the phase adjustment amount change period 24 is 2.1pi according to the calculation formula of the corrected phase modulation depth value, and is a comparison graph of the corrected target gray-scale phase response curve and the original target gray-scale phase response curve as shown in fig. 16(a) and 16 (b).
Finally, referring to fig. 17(a) and 17(b), the calibration device obtains an LUT curve corresponding to the phase adjustment amount change period 8 from the initial gray scale phase response curve and the corrected target gray scale phase response curve corresponding to the phase adjustment amount change period 8, and obtains an LUT curve corresponding to the phase adjustment amount change period 24 from the initial gray scale phase response curve and the corrected target gray scale phase response curve corresponding to the phase adjustment amount change period 24.
The obtained LUT corresponding to the phase adjustment amount change cycle 8 and the LUT corresponding to the phase adjustment amount change cycle 24 are written into the memory area of the LCoS.
Referring to fig. 18, an embodiment of the present invention provides an LCoS phase calibration apparatus, including: a communication interface 1801 and a processor 1802 coupled to communication interface 1801;
the processor 1802 is configured to:
loading the same gray value on each pixel point of the LCoS through the communication interface, and acquiring phase modulation amounts respectively corresponding to different gray values loaded for multiple times to obtain an initial response relation; obtaining an initial gray value corresponding relation according to the initial response relation and a target response relation corresponding to the phase modulation amount change period K, wherein K is a positive integer; determining K input gray values corresponding to the phase modulation amount change period K according to a preset gray value range corresponding to the target response relationship, and determining K output gray values corresponding to the K input gray values according to the initial gray value corresponding relationship; loading corresponding output gray values on K pixel points corresponding to a phase modulation amount change period K through the communication interface respectively to obtain an actual phase modulation depth value corresponding to the phase modulation amount change period K; determining a corrected phase modulation depth value and a corrected target response relation based on the actual phase modulation depth value and a target phase modulation depth value corresponding to the target response relation; and obtaining a gray value corresponding relation corresponding to the phase modulation variable variation period K according to the initial response relation and the corrected target response relation.
In a possible implementation manner, the gray-level value and the phase adjustment amount in the target response relationship are in a preset linear variation relationship.
In a possible implementation manner, the initial gray-level value correspondence relationship refers to a correspondence relationship between an input gray-level value and an output gray-level value under any one same phase adjustment amount, where the input gray-level value refers to a gray-level value in the target response relationship, and the output gray-level value refers to a gray-level value in the initial response relationship.
In one possible implementation, the modified phase modulation depth value is determined by the following formula:
c＝a2/b
wherein c is the corrected phase modulation depth value, a is the target phase modulation depth value, and b is the actual phase modulation depth value;
and the corrected target response relation is determined according to the corrected phase modulation depth value and the preset gray value range.
In one possible implementation, the processor 1802 is specifically configured to:
loading corresponding output gray values on K pixel points corresponding to a phase modulation amount change period K respectively, and obtaining voltage values corresponding to the K output gray values respectively when obtaining an actual phase modulation depth value corresponding to the phase modulation amount change period K, wherein each output gray value corresponds to one voltage value;
according to the voltage values corresponding to the K output gray values, sequentially loading voltage signals corresponding to the K voltage values to K pixel points corresponding to the phase modulation amount change period K through the communication interface;
measuring phase modulation amounts corresponding to K pixel points after the voltage signal is loaded;
and determining the actual phase modulation depth value corresponding to the phase modulation change period K according to the phase modulation amount corresponding to the K pixel points respectively.
In a possible implementation manner, when the processor 1802 determines the actual phase modulation depth value corresponding to the phase modulation change period K according to the phase adjustment amounts respectively corresponding to the K pixel points, the actual phase modulation depth value is determined by using the following formula:
wherein b is the actual phase modulation depth value, P1 is the maximum value among the phase adjustment amounts respectively corresponding to the K pixel points, and P2 is the minimum value among the phase adjustment amounts respectively corresponding to the K pixel points.
In a possible implementation manner, the gray-level value corresponding relationship corresponding to the phase modulation amount variation cycle K refers to a corresponding relationship between an input gray-level value after correction and an output gray-level value after correction under any one same phase modulation amount, where the input gray-level value after correction refers to a gray-level value in the target response relationship after correction, and the output gray-level value refers to a gray-level value in the initial response relationship.
In one possible implementation, the processor 1802 is further configured to:
after the gray value corresponding relation corresponding to the phase modulation amount change period K is obtained according to the initial response relation and the corrected target response relation, the gray value corresponding relation corresponding to the phase modulation amount change period K is stored in a storage area of the LCoS, so that when the blazed grating of the phase modulation amount change period K is loaded on the LCoS, corresponding corrected output gray values are loaded on K pixel points corresponding to the phase modulation amount change period K respectively according to the gray value corresponding relation corresponding to the phase modulation amount change period K.
In summary, the method provided by the embodiment of the present invention can correct phase errors corresponding to different phase adjustment amount change periods, and effectively reduce crosstalk influence between pixels in the LCoS, and particularly, the method provided by the embodiment of the present invention has a significant effect on solving crosstalk influence between pixels of next generation of ultra-small pixels, and moreover, insertion loss and high-order diffracted light energy of the LCoS when applied to devices such as a WSS device can be effectively reduced by correcting the phase errors.
It should be noted that, the division of the modules in the embodiments of the present invention is schematic, and is only a logical function division, and in actual implementation, there may be another division manner, and in addition, each functional module in each embodiment of the present application may be integrated in one processing module, or each module may exist alone physically, or two or more modules are integrated in one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and flow in the flow diagrams and/or block diagrams, can be implemented by computer program instructions
And/or a combination of blocks. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the invention. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.
Claims (16)
1. A phase calibration method for LCoS (liquid Crystal on silicon) is characterized by comprising the following steps:
loading the same gray value on each pixel point of the LCoS, and acquiring phase modulation amounts respectively corresponding to different gray values loaded for multiple times to obtain an initial response relation;
obtaining an initial gray value corresponding relation according to the initial response relation and a target response relation corresponding to the phase modulation amount change period K, wherein K is a positive integer;
determining K input gray values corresponding to the phase modulation amount change period K according to a preset gray value range corresponding to the target response relationship, and determining K output gray values corresponding to the K input gray values according to the initial gray value corresponding relationship;
loading corresponding output gray values on K pixel points corresponding to a phase modulation amount change period K respectively to obtain an actual phase modulation depth value corresponding to the phase modulation amount change period K;
determining a corrected phase modulation depth value and a corrected target response relation based on the actual phase modulation depth value and a target phase modulation depth value corresponding to the target response relation;
and obtaining a gray value corresponding relation corresponding to the phase modulation variable variation period K according to the initial response relation and the corrected target response relation.
2. The method of claim 1, wherein the gray-level value and the phase adjustment amount in the target response relationship are in a preset linear variation relationship.
3. The method according to claim 1 or 2, wherein the initial gray-level value correspondence relationship is a correspondence relationship between an input gray-level value and an output gray-level value under any one same phase adjustment amount, wherein the input gray-level value is a gray-level value in the target response relationship, and the output gray-level value is a gray-level value in the initial response relationship.
4. A method according to claim 1 or 2, wherein the modified phase modulation depth value is determined using the formula:
c＝a2/b
wherein c is the corrected phase modulation depth value, a is the target phase modulation depth value, and b is the actual phase modulation depth value;
and the corrected target response relation is determined according to the corrected phase modulation depth value and the preset gray value range.
5. The method according to claim 1 or 2, wherein the step of obtaining the actual phase modulation depth value corresponding to the phase modulation amount change period K by loading corresponding output gray values on K pixel points corresponding to the phase modulation amount change period K comprises:
obtaining voltage values corresponding to the K output gray values respectively, wherein each output gray value corresponds to one voltage value;
sequentially loading voltage signals corresponding to the K voltage values to K pixel points corresponding to the phase modulation amount change period K according to the voltage values corresponding to the K output gray values respectively;
measuring phase modulation amounts corresponding to K pixel points after the voltage signal is loaded;
and determining the actual phase modulation depth value corresponding to the phase modulation change period K according to the phase modulation amount corresponding to the K pixel points respectively.
6. The method according to claim 5, wherein when determining the actual phase modulation depth value corresponding to the phase modulation change period K according to the phase adjustment amounts corresponding to the K pixel points, the actual phase modulation depth value is determined by using the following formula:
wherein b is the actual phase modulation depth value, P1 is the maximum value among the phase adjustment amounts respectively corresponding to the K pixel points, and P2 is the minimum value among the phase adjustment amounts respectively corresponding to the K pixel points.
7. The method according to claim 1, 2 or 6, wherein the gray-level value corresponding to the phase modulation amount variation period K is a corresponding relationship between a corrected input gray-level value and a corrected output gray-level value under any one same phase adjustment amount, wherein the corrected input gray-level value is a gray-level value in the corrected target response relationship, and the output gray-level value is a gray-level value in the initial response relationship.
8. The method according to claim 1, 2, or 6, wherein after obtaining the gray value corresponding relationship corresponding to the phase modulation amount variation cycle K according to the initial response relationship and the corrected target response relationship, further comprising:
and storing the gray value corresponding relation corresponding to the phase modulation change period K into a storage area of the LCoS, so that when the LCoS loads a blazed grating of the phase modulation change period K, corresponding corrected output gray values are loaded on K pixel points corresponding to the phase modulation change period K respectively according to the gray value corresponding relation corresponding to the phase modulation change period K.
9. An LCoS phase calibration apparatus, comprising: a communication interface and a processor coupled to the communication interface;
the processor is configured to:
loading the same gray value on each pixel point of the LCoS through the communication interface, and acquiring phase modulation amounts respectively corresponding to different gray values loaded for multiple times to obtain an initial response relation;
obtaining an initial gray value corresponding relation according to the initial response relation and a target response relation corresponding to the phase modulation amount change period K, wherein K is a positive integer;
determining K input gray values corresponding to the phase modulation amount change period K according to a preset gray value range corresponding to the target response relationship, and determining K output gray values corresponding to the K input gray values according to the initial gray value corresponding relationship;
loading corresponding output gray values on K pixel points corresponding to a phase modulation amount change period K through the communication interface respectively to obtain an actual phase modulation depth value corresponding to the phase modulation amount change period K;
determining a corrected phase modulation depth value and a corrected target response relation based on the actual phase modulation depth value and a target phase modulation depth value corresponding to the target response relation;
and obtaining a gray value corresponding relation corresponding to the phase modulation variable variation period K according to the initial response relation and the corrected target response relation.
10. The apparatus of claim 9, wherein the gray-level value and the phase adjustment amount in the target response relationship are in a preset linear variation relationship.
11. The apparatus according to claim 9 or 10, wherein the initial gray value corresponding relationship is a corresponding relationship between an input gray value and an output gray value under any one same phase adjustment amount, wherein the input gray value is a gray value in the target response relationship, and the output gray value is a gray value in the initial response relationship.
12. The apparatus of claim 9 or 10, wherein the modified phase modulation depth value is determined using the formula:
c＝a2/b
wherein c is the corrected phase modulation depth value, a is the target phase modulation depth value, and b is the actual phase modulation depth value;
and the corrected target response relation is determined according to the corrected phase modulation depth value and the preset gray value range.
13. The device of claim 9 or 10, wherein the processor is specifically configured to:
loading corresponding output gray values on K pixel points corresponding to a phase modulation amount change period K respectively, and obtaining voltage values corresponding to the K output gray values respectively when obtaining an actual phase modulation depth value corresponding to the phase modulation amount change period K, wherein each output gray value corresponds to one voltage value;
according to the voltage values corresponding to the K output gray values, sequentially loading voltage signals corresponding to the K voltage values to K pixel points corresponding to the phase modulation amount change period K through the communication interface;
measuring phase modulation amounts corresponding to K pixel points after the voltage signal is loaded;
and determining the actual phase modulation depth value corresponding to the phase modulation change period K according to the phase modulation amount corresponding to the K pixel points respectively.
14. The apparatus according to claim 13, wherein when the processor determines the actual phase modulation depth value corresponding to the phase modulation change period K according to the phase adjustment amounts corresponding to the K pixel points, the actual phase modulation depth value is determined by using the following formula:
wherein b is the actual phase modulation depth value, P1 is the maximum value among the phase adjustment amounts respectively corresponding to the K pixel points, and P2 is the minimum value among the phase adjustment amounts respectively corresponding to the K pixel points.
15. The apparatus according to claim 9, 10 or 14, wherein the gray-level value corresponding to the phase modulation amount variation period K is a corresponding relationship between a corrected input gray-level value and a corrected output gray-level value under any one same phase adjustment amount, wherein the corrected input gray-level value is a gray-level value in the corrected target response relationship, and the output gray-level value is a gray-level value in the initial response relationship.
16. The apparatus of claim 9, 10, or 14, wherein the processor is further configured to:
after the gray value corresponding relation corresponding to the phase modulation amount change period K is obtained according to the initial response relation and the corrected target response relation, the gray value corresponding relation corresponding to the phase modulation amount change period K is stored in a storage area of the LCoS, so that when the blazed grating of the phase modulation amount change period K is loaded on the LCoS, corresponding corrected output gray values are loaded on K pixel points corresponding to the phase modulation amount change period K respectively according to the gray value corresponding relation corresponding to the phase modulation amount change period K.
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| CN113703241B (en) * | 2020-05-21 | 2022-10-18 | 华为技术有限公司 | LCOS adjusting method, optical device and reconfigurable optical add-drop multiplexer |
| CN111627403B (en) * | 2020-06-05 | 2021-11-09 | 南京芯视元电子有限公司 | Automatic phase linearity correction system of LCoS spatial light modulator |
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| JP2012151628A (en) * | 2011-01-19 | 2012-08-09 | Jvc Kenwood Corp | Phase adjustment device |
| CN202172209U (en) * | 2011-08-30 | 2012-03-21 | 华为技术有限公司 | External cavity tunable laser based on liquid crystal on silicon |
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