Polarization beam splitter structure and generation method thereof

Abstract

The invention relates to the technical field of polarization beam splitters, in particular to a polarization beam splitter structure and a generation method thereof. The polarization beam splitter structure is provided with a coupler, an incident waveguide, a transverse electric waveguide and a transverse magnetic waveguide, the input end of the coupler is connected with the incident waveguide, the output end of the coupler is connected with the transverse electric waveguide and the transverse magnetic waveguide, and the generation method of the polarization beam splitter structure comprises the steps of obtaining target optical data of the incident waveguide, target functions of the transverse electric waveguide and the transverse magnetic waveguide are determined; based on a preset optimization algorithm and the target function, obtaining an initial optimization value of the target function and a simulation structure of the polarization beam splitter; and based on the simulation structure and the target function, updating the optimization value until the size of the simulation structure is not greater than a preset size, and taking the simulation structure as the polarization beam splitter structure. And the optimization value is updated for multiple times through iteration, so that the micro adjustment of the simulation structure is realized.

Description

Technical Field

[0001] The present disclosure relates to the technical field of polarization beam splitters, and in particular to a polarization beam splitter structure and a generation method thereof. Background Art

[0002] In communication technology, in order to improve communication capacity, transverse electric (TE) and transverse magnetic (TM) modes are usually used to transmit optical information. Polarization beam splitter (PBS) is the most important functional device in this technology. Polarization beam splitter is used to separate light beams with different polarization states into two different light beams. Usually, it separates the transverse electric mode and transverse magnetic mode polarization in the incident light so that they propagate in different directions. Currently, commonly used on-chip polarization beam splitters mainly include multi-mode interference coupler (MMI), directional coupler (DC), photonic crystal (PhC), Mach-Zehnder interferometers (MZIs), etc.

[0003] On-chip integrated photonic devices are developing rapidly towards high density and high integration, and reducing the structural size of the device is one of the key ways to achieve this goal. However, the current polarization beam splitter occupies a large area, which limits its application in highly integrated photonic chips. Summary of the invention

[0004] Based on this, it is necessary to provide a polarization beam splitter structure and a method for generating the same in order to address the problem that the polarization beam splitter in the prior art is difficult to miniaturize.

[0005] In order to achieve the above object, on the one hand, a method for generating a polarization beam splitter structure is provided.

[0006] The polarization beam splitter structure comprises a coupler, an incident waveguide, a transverse electric waveguide and a transverse magnetic waveguide, the input end of the coupler is connected to the incident waveguide, and the two output ends of the coupler are respectively connected to the transverse electric waveguide and the transverse magnetic waveguide. The method for generating the polarization beam splitter structure comprises:

[0007] Acquiring target light data of the incident waveguide;

[0008] Determine the target functions of the transverse electric waveguide and the transverse magnetic waveguide based on the target light data of the incident waveguide;

[0009] Based on a preset optimization algorithm and the objective function, obtaining an initial optimization value of the objective function and a simulation structure of the polarization beam splitter;

[0010] Based on the simulation structure and the objective function, the optimization value is updated until the size of the simulation structure is no larger than a preset size, and the simulation structure is used as the polarization beam splitter structure.

[0011] In one embodiment, determining the target functions of the transverse electric waveguide and the transverse magnetic waveguide based on the target light data of the incident waveguide includes:

[0012] Based on the target light data, determining light field distribution data of the target light data;

[0013] Based on the light field distribution data, a transverse electric polarization transmittance of the transverse electric waveguide and a transverse magnetic polarization transmittance of the transverse magnetic waveguide are obtained;

[0014] Based on the transverse electric polarization transmittance and the transverse magnetic polarization transmittance, objective functions of the transverse electric waveguide and the transverse magnetic waveguide are determined.

[0015] In one embodiment, determining the objective functions of the transverse electric waveguide and the transverse magnetic waveguide based on the transverse electric polarization transmittance and the transverse magnetic polarization transmittance includes:

[0016] Based on the transverse electric polarization transmittance T1, determining the objective function of the transverse electric waveguide as 1-T1;

[0017] Based on the transverse magnetic polarization transmittance T2, the objective function of the transverse magnetic waveguide is determined to be 1-T2.

[0018] In one of the embodiments, determining the light field distribution data of the target light data based on the target light data includes:

[0019] Determining an initial electric field value, an initial magnetic field value, a step length, and a preset condition in the target light data;

[0020] Based on the initial electric field value, the initial magnetic field value, the step size and the preset conditions, calculating the electric field value at the target time and the magnetic field value at the target time;

[0021] The light field distribution data is determined based on the electric field value at the target moment and the magnetic field value at the target moment.

[0022] In one embodiment, the step of obtaining an initial optimized value of the objective function and a simulated structure of the polarization beam splitter based on a preset optimization algorithm and the objective function includes:

[0023] Acquire a target refractive index distribution of a coupler of the polarization beam splitter structure;

[0024] Based on the target refractive index distribution and the objective function, an initial optimized value of the objective function and a simulated structure of the polarization beam splitter are obtained.

[0025] In one of the embodiments, the preset optimization algorithm includes a topology optimization algorithm.

[0026] In one embodiment, the updating of the optimization value based on the simulation structure and the objective function until the size of the simulation structure is no greater than a preset size and the simulation structure is used as the polarization beam splitter structure comprises:

[0027] The simulated structure is shown.

[0028] In one of the embodiments, the preset size is no greater than 6 μm×4 μm.

[0029] In one of the embodiments, the wavelength band of the incident light of the incident waveguide is between 1500nm-1600nm.

[0030] In one aspect, a polarization beam splitter structure is provided, comprising:

[0031] Incident waveguide;

[0032] A coupler, wherein the incident waveguide is connected to an input end of the coupler, and the coupler is obtained using the method for generating a polarization beam splitter structure as described in any one of the above items;

[0033] a transverse electric waveguide connected to an output end of the coupler;

[0034] A transverse magnetic waveguide is connected to the output end of the coupler.

[0035] The polarization beam splitter structure and generation method thereof of the present specification have the following beneficial effects: first, by updating the optimization value based on the simulation structure and the objective function until the size of the simulation structure is not greater than the preset size, the optimization value is updated multiple times through iteration, thereby achieving a slight adjustment of the simulation structure to reduce the size of the polarization beam splitter structure and improve the polarization separation performance of the polarization beam splitter structure. Secondly, by setting the objective function, the separation effect of the transverse electric mode and the transverse magnetic mode can be optimized on the basis of reducing the size of the polarization beam splitter structure, thereby ensuring the efficiency of the polarization beam splitter structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the conventional technology, the drawings required for use in the embodiments or the conventional technology descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1 is a schematic diagram of a polarization beam splitter structure provided in an embodiment;

[0038] Figure 2 is a schematic diagram of a coupler provided in an embodiment;

[0039] Figure 3 is a flow chart of a method for generating a polarization beam splitter structure provided in an embodiment;

[0040] Figure 4 A flow chart of a method for generating a polarization beam splitter structure provided in another embodiment;

[0041] Figure 5 is a flow chart of a method for generating a polarization beam splitter structure provided in yet another embodiment;

[0042] Figure 6 This is a schematic diagram of the test results of the polarization beam splitter structure;

[0043] Figure 7 A schematic diagram of test results of another polarization beam splitter structure;

[0044] Figure 8 is a structural block diagram of a device for generating a polarization beam splitter structure provided in an embodiment;

[0045] Fig. 9 FIG. 4 is a diagram showing the internal structure of a computer device in one embodiment.

[0046] Description of the reference numerals: polarization beam splitter structure-100; coupler-110; incident waveguide-120; transverse electric waveguide-130; transverse magnetic waveguide-140; substrate-150.

[0047] In order to better describe and illustrate the embodiments and examples of the inventions disclosed herein, reference may be made to one or more drawings. The additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the disclosed inventions, the embodiments and examples currently described, and the best modes of these inventions currently understood. DETAILED DESCRIPTION

[0048] In order to facilitate understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are shown in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thorough and comprehensive.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present disclosure belongs. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0050] In each embodiment, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in each embodiment can be understood according to the specific situation.

[0051] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there is no intervening element or layer. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and parts, these elements, components, regions, layers and parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teaching of the present embodiment, the first element, component, region, layer or part discussed below can be represented as the second element, component, region, layer or part.

[0052] Spatial relationship terms such as "under", "below", "below", "under", "above", "above", etc., may be used herein to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that in addition to the orientations shown in the figures, spatial relationship terms also include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is turned over, the element or feature described as "under other elements" or "under it" or "under it" will be oriented as "on" other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. In addition, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptors used herein are interpreted accordingly.

[0053] When used herein, the singular forms "a", "an", and "said / the" may also include plural forms, unless the context clearly indicates otherwise. It should also be understood that when the terms "comprising" and "including" are used in this specification, the presence of the features, integers, steps, operations, elements, and components may be determined, but the presence or addition of one or more other features, integers, steps, operations, elements, components, and groups is not excluded. At the same time, when used herein, the term "and" includes any and all combinations of the relevant listed items.

[0054] The embodiments of the present specification are described herein with reference to schematic diagrams that are ideal embodiments (and simulated structures) of the present specification, so that variations in the shapes shown due to, for example, manufacturing techniques and tolerances can be expected. Therefore, the embodiments of the present specification should not be limited to the specific shapes of the regions shown herein, but include shape deviations due to, for example, manufacturing techniques. The regions shown in the figures are schematic in nature, and their shapes do not represent the actual shapes of the regions of the device, and do not limit the scope of the embodiments of the present specification.

[0055] See also Figure 1 In one embodiment, a polarization beam splitter structure 100 is provided. The polarization beam splitter structure 100 has a coupler 110, an incident waveguide 120, a transverse electric waveguide 130, and a transverse magnetic waveguide 140. The above structure can be disposed on a substrate 150.

[0056] The input end of the coupler 110 is connected to the incident waveguide 120, and the output end of the coupler 110 is connected to the transverse electric waveguide 130 and the transverse magnetic waveguide 140. As an example, the coupler 110 may include a multimode interference coupler, etc. The multimode interference coupler makes the transverse electric mode and the transverse magnetic mode of the light field have different propagation constants (i.e., different phase velocities) in the coupler 110 by designing appropriate waveguide width and length. This difference causes the transverse electric mode light field and the transverse magnetic mode light field to gather at different positions at the end of the multimode interference coupler. For example, the transverse electric mode light field gathers at the transverse electric waveguide 130, and the transverse magnetic mode light field gathers at the transverse magnetic waveguide 140, thereby realizing polarization splitting. Therefore, please refer to Figure 2 By setting the material distribution or geometric shape of the coupler 110 of the polarization beam splitter structure 100, a polarization beam splitter structure 100 with better efficiency can be obtained. The method for generating the polarization beam splitter structure 100 provided in one or more of the following embodiments can generate a polarization beam splitter structure 100 with smaller size and better efficiency.

[0057] The method for generating the polarization beam splitter structure 100 provided in one or more of the following embodiments of this embodiment can be applied to a terminal or a server. The terminal can be, but is not limited to, various personal computers, laptops, smart phones, tablet computers, etc. The server can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides cloud computing services.

[0058] In one embodiment, see Figure 3 , a method for generating a polarization beam splitter structure 100 is provided. This embodiment uses the method applied to a terminal as an example for explanation. It can be understood that the method can also be applied to a server, and can also be applied to a system including a terminal and a server, and is implemented through the interaction between the terminal and the server. In this embodiment, the generation of the polarization beam splitter structure 100 includes the following steps:

[0059] Step S2: acquiring target light data incident on the waveguide 120 .

[0060] Step S4: determining the target functions of the transverse electric waveguide 130 and the transverse magnetic waveguide 140 based on the target light data of the incident waveguide 120 .

[0061] Step S6: Based on the preset optimization algorithm and the objective function, an initial optimization value of the objective function and a simulation structure of the polarization beam splitter are obtained.

[0062] Step S8: Based on the simulated structure and the objective function, the optimization value is updated until the size of the simulated structure is no larger than a preset size, and the simulated structure is used as the polarization beam splitter structure 100 .

[0063] In step S2, the incident waveguide 120 is used to receive target light data. The target light data may include parameters such as polarization state, intensity, and wavelength of the target light.

[0064] In step S4, the objective functions of the transverse electric waveguide 130 and the transverse magnetic waveguide 140 can be determined according to the polarization transmittance of the transverse electric mode and the polarization transmittance of the transverse magnetic mode in the target light data. The objective function is used to optimize the separation effect of the transverse electric mode and the transverse magnetic mode. This embodiment does not limit the specific expression form of the objective function.

[0065] In step S6, the preset optimization algorithm may include a topology optimization algorithm based on gradient optimization. Of course, this embodiment does not limit the specific form of the preset optimization algorithm. As an example, the objective function can be defined according to the required performance indicators such as polarization separation efficiency, insertion loss, and reflection loss.

[0066] By solving the preset optimization algorithm and the objective function, the initial optimization value of the objective function and the simulated structure of the polarization beam splitter can be obtained. The simulated structure of the polarization beam splitter may include the material distribution or geometric shape of the coupler 110. As an example, the coupler 110 may include a central portion located in the middle area, and a peripheral portion surrounding the central portion. The geometric shape of the coupler 110 may include specific parameters of the length, width, and height of the central portion and the peripheral portion. Alternatively, the geometric shape of the coupler 110 may also include the shape of the central portion and the peripheral portion, etc.

[0067] In step S8, the length and width of the simulation result and the separation effect of the simulation structure can be obtained based on the simulation structure that has been obtained, and the objective function is used again to obtain a new optimization value. It can be understood that this step can be performed multiple times, so as to iterate and update the optimization value multiple times until the size of the simulation structure is no larger than the preset size. At this time, the simulation structure can be used as the polarization beam splitter structure 100. In each iteration, the optimization value is updated according to the current simulation structure and the objective function. This update process involves minor adjustments to the simulation structure to improve the polarization separation performance of the polarization beam splitter structure 100.

[0068] As an example, when the size of the simulated structure is no larger than 6 μm×4 μm, the simulated structure is used as the polarization beam splitter structure 100. The above data are only examples, and in actual embodiments, the size of the simulated structure is not limited to the above data.

[0069] In this embodiment, firstly, by updating the optimization value based on the simulation structure and the objective function until the size of the simulation structure is not greater than the preset size, the optimization value is updated multiple times through iteration, thereby achieving a slight adjustment of the simulation structure to reduce the size of the polarization beam splitter structure 100 and improve the polarization separation performance of the polarization beam splitter structure 100. Secondly, by setting the objective function, the separation effect of the transverse electric mode and the transverse magnetic mode can be optimized on the basis of reducing the size of the polarization beam splitter structure 100, thereby ensuring the efficiency of the polarization beam splitter structure 100.

[0070] In one embodiment, see Figure 4 , step S4 comprises:

[0071] Step S40: determining light field distribution data of the target light data based on the target light data.

[0072] Step S41: based on the light field distribution data, the transverse electric polarization transmittance of the transverse electric waveguide 130 and the transverse magnetic polarization transmittance of the transverse magnetic waveguide 140 are obtained.

[0073] Step S42: Determine the objective functions of the transverse electric waveguide 130 and the transverse magnetic waveguide 140 based on the transverse electric polarization transmittance and the transverse magnetic polarization transmittance.

[0074] In step S40, the light field distribution data of the target light data may include the distribution of properties such as the intensity of the light in space, the propagation direction of the light, the phase, and the polarization.

[0075] In step S41 to step S42, in one possible example, the objective function of the transverse electric waveguide 130 may be determined to be 1-T1 based on the transverse electric polarization transmittance T1. In another possible example, the objective function of the transverse magnetic waveguide 140 may be determined to be 1-T2 based on the transverse magnetic polarization transmittance T2. At this time, the complement of the transmittance of the transverse electric mode and the transverse magnetic mode is taken as the optimization target, thereby reducing the loss of the transmittance of the transverse electric mode and the transverse magnetic mode.

[0076] In this embodiment, the objective functions of the transverse electric waveguide 130 and the transverse magnetic waveguide 140 are determined by the transverse electric polarization transmittance and the transverse magnetic polarization transmittance, thereby reducing the loss of the transverse electric mode and the transverse magnetic mode transmittance.

[0077] In one embodiment, see Figure 5 , step S4 comprises:

[0078] Step S43: Determine the initial electric field value, the initial magnetic field value, the step length and the preset condition in the target light data.

[0079] Step S44: Based on the initial electric field value, the initial magnetic field value, the step size and the preset conditions, the electric field value at the target moment and the magnetic field value at the target moment are calculated.

[0080] Step S45: Determine the light field distribution data based on the electric field value at the target time and the magnetic field value at the target time.

[0081] In step S43 to step S45, the finite time-domain difference method can be used to simulate the propagation behavior of light in the device, and the detailed distribution and mode transmission characteristics of the light field can be obtained by solving the Maxwell equations. Specifically, the initial electric field value and the initial magnetic field value can be set according to the physical parameters and boundary conditions of the target light data. The step size can be used to represent the propagation interval of the current magnetic field and the current electric field. For example, the time step can be determined according to the propagation speed of the electromagnetic wave and the grid size, and the values ​​of the electric field and the magnetic field are updated at each time step. For another example, the electric field at the current moment can be calculated based on the magnetic field at the current moment and the electric field of the previous time step. The preset condition can be a predetermined simulation time, etc.

[0082] In this embodiment, the electric field value at the target moment and the magnetic field value at the target moment are calculated based on the initial electric field value, the initial magnetic field value, the step size and the preset conditions, so as to obtain real-time light field distribution data, and then obtain accurate target functions of the transverse electric waveguide 130 and the transverse magnetic waveguide 140, as well as an accurate polarization beam splitter structure 100.

[0083] In one embodiment, step S6 includes:

[0084] Step S60 : obtaining a target refractive index distribution of the coupler 110 of the polarization beam splitter structure 100 .

[0085] Step S61: Based on the target refractive index distribution and the objective function, an initial optimized value of the objective function and a simulated structure of the polarization beam splitter are obtained.

[0086] In step S60 to step S61, the target refractive index distribution may refer to the refractive index required for achieving the expected performance of the coupler 110 of the polarization beam splitter structure 100 under the condition of the target light data. The coupler 110 of the polarization beam splitter structure 100 may have a plurality of partitions, each of which may have a target refractive index distribution. Afterwards, the initial optimization value of the objective function and the simulation structure of the polarization beam splitter may be obtained based on the target refractive index distribution, the objective function and the constraint conditions.

[0087] In this embodiment, the target refractive index distribution of the coupler 110 is determined, thereby determining the initial optimization value of the objective function so that the simulated structure of the polarization beam splitter has the target refractive index distribution, thereby reducing the possibility of performance degradation of the simulated structure of the polarization beam splitter.

[0088] In one embodiment, after step S8, the following steps are included:

[0089] Step S10: Display the simulation structure.

[0090] As an example, each simulated structure may be displayed on the display, and specifically, specific parameters of each simulated structure may also be displayed, such as the length and width of each simulated structure, or the simulation result of each simulated structure.

[0091] In this embodiment, by displaying the simulated structure on the display, the geometric structure or material distribution of the simulated structure can be clearly displayed, and then it can be determined whether it is necessary to continue the iteration step.

[0092] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0093] Based on the same inventive concept, in one embodiment, a polarization beam splitter structure 100 is provided. The polarization beam splitter structure 100 includes an incident waveguide 120, a coupler 110, a transverse electric waveguide 130, and a transverse magnetic waveguide 140.

[0094] The incident waveguide 120 can be connected to the input end of the coupler 110. As an example, the wavelength band of the incident light of the polarization beam splitter structure 100 is between 1500nm-1600nm. The coupler 110 can be obtained using the generation method of the polarization beam splitter structure 100 provided in any one or more of the aforementioned embodiments. Specifically, the coupler 110 can have a geometric distribution. As an example, the size of the coupler 110 can be no greater than 6μm×4μm. The transverse electric waveguide 130 and the transverse magnetic waveguide 140 are respectively connected to the output ends of the coupler 110. As an example, the transverse electric waveguide 130 and the transverse magnetic waveguide 140 can be arranged in parallel. The above data are only used as examples. In actual embodiments, the size of the simulation structure and the wavelength band of the incident light of the polarization beam splitter structure 100 are not limited to the above data.

[0095] In this embodiment, by setting the coupler 110, the method for generating the polarization beam splitter structure 100 provided in any one or more of the aforementioned embodiments can be used to obtain a smaller coupler 110 size, which is conducive to the miniaturization of the polarization beam splitter structure 100.

[0096] like Figure 6 and Figure 7 As shown, through the polarization beam splitter structure 100 provided by one or more embodiments and combinations thereof of the present application, the output transmittance of the transverse electric waveguide and the output transmittance of the transverse magnetic waveguide can be made greater than -0.3dB and -0.2dB, respectively. In addition, the polarization extinction ratios of transverse electric polarized light and transverse magnetic polarized light are respectively greater than 21dB and 22dB in the entire band. Therefore, the polarization beam splitter structure provided by the present application not only has a high transmittance, but also exhibits better performance in terms of wide bandwidth and high polarization extinction ratio, providing strong support for the multifunctional application of on-chip integrated photonic devices.

[0097] Therefore, the polarization beam splitter structure provided by the present application has a small volume and good performance.

[0098] Based on the same inventive concept, the embodiment of the present application also provides a generating device of a polarization beam splitter structure 100 for implementing the generating method of the polarization beam splitter structure 100 involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific definition in the embodiment of one or more generating devices of the polarization beam splitter structure 100 provided below can refer to the definition of the generating method of the polarization beam splitter structure 100 above, and will not be repeated here.

[0099] In one embodiment, Figure 8 As shown, a device for generating a polarization beam splitter structure 100 is provided, comprising: a first acquisition module, a determination module, a second acquisition module and an update module, wherein:

[0100] The first acquisition module is used to acquire target light data of the incident waveguide 120 .

[0101] The determination module is used to determine the target functions of the transverse electric waveguide 130 and the transverse magnetic waveguide 140 based on the target light data of the incident waveguide 120 .

[0102] The second acquisition module is used to acquire an initial optimization value of the objective function and a simulated structure of the polarization beam splitter based on a preset optimization algorithm and the objective function.

[0103] The updating module is used to update the optimization value based on the simulation structure and the objective function until the size of the simulation structure is no larger than the preset size, and the simulation structure is used as the polarization beam splitter structure 100 .

[0104] In one embodiment, the determination module is also used to determine light field distribution data of the target light data based on the target light data, obtain the transverse electric polarization transmittance of the transverse electric waveguide 130 and the transverse magnetic polarization transmittance of the transverse magnetic waveguide 140 based on the light field distribution data, and determine the target functions of the transverse electric waveguide 130 and the transverse magnetic waveguide 140 based on the transverse electric polarization transmittance and the transverse magnetic polarization transmittance.

[0105] In one embodiment, the determination module is further used to determine the objective function of the transverse electric waveguide 130 as 1-T1 based on the transverse electric polarization transmittance T1, and to determine the objective function of the transverse magnetic waveguide 140 as 1-T2 based on the transverse magnetic polarization transmittance T2.

[0106] In one embodiment, the determination module is also used to determine the initial electric field value, the initial magnetic field value, the step size and the preset conditions in the target light data, and calculate the electric field value at the target moment and the magnetic field value at the target moment based on the initial electric field value, the initial magnetic field value, the step size and the preset conditions, and determine the light field distribution data based on the electric field value at the target moment and the magnetic field value at the target moment.

[0107] In one embodiment, the second acquisition module is also used to acquire the target refractive index distribution of the coupler 110 of the polarization beam splitter structure 100, and based on the target refractive index distribution and the objective function, acquire the initial optimized value of the objective function and the simulated structure of the polarization beam splitter.

[0108] In one embodiment, the preset optimization algorithm includes a topology optimization algorithm.

[0109] In one embodiment, the generating device of the polarization beam splitter structure 100 includes a display module, and the display module is used to display a simulated structure.

[0110] Each module in the generating device of the polarization beam splitter structure 100 can be implemented in whole or in part by software, hardware, or a combination thereof. Each module can be embedded in or independent of a processor in a computer device in the form of hardware, or can be stored in a memory in a computer device in the form of software, so that the processor can call and execute operations corresponding to each module.

[0111] In an exemplary embodiment, a computer device is provided. The computer device may be a terminal, and its internal structure diagram may be as shown in FIG. Fig. 9As shown. The computer device includes a processor, a memory, an input / output interface, a communication interface, a display unit and an input device. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface, the display unit and the input device are connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the computer device is used to exchange information between the processor and the external device. The communication interface of the computer device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, near field communication (Near Field Communication, NFC) or other technologies. When the computer program is executed by the processor, a method for generating a polarization beam splitter structure 100 is implemented. The display unit of the computer device is used to form a visually visible picture, which can be a display screen, a projection device or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the computer device shell, or an external keyboard, touchpad or mouse.

[0112] Those skilled in the art will understand that Fig. 9 The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0113] In an exemplary embodiment, a computer device is provided, including a memory and a processor, wherein a computer program is stored in the memory, and when the processor executes the computer program, the following steps are implemented:

[0114] Step S2: acquiring target light data incident on the waveguide 120 .

[0115] Step S4: determining the target functions of the transverse electric waveguide 130 and the transverse magnetic waveguide 140 based on the target light data of the incident waveguide 120 .

[0116] Step S6: Based on the preset optimization algorithm and the objective function, an initial optimization value of the objective function and a simulation structure of the polarization beam splitter are obtained.

[0117] Step S8: Based on the simulated structure and the objective function, the optimization value is updated until the size of the simulated structure is no larger than a preset size, and the simulated structure is used as the polarization beam splitter structure 100 .

[0118] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0119] Step S40: determining light field distribution data of the target light data based on the target light data.

[0120] Step S41: based on the light field distribution data, the transverse electric polarization transmittance of the transverse electric waveguide 130 and the transverse magnetic polarization transmittance of the transverse magnetic waveguide 140 are obtained.

[0121] Step S42: Determine the objective functions of the transverse electric waveguide 130 and the transverse magnetic waveguide 140 based on the transverse electric polarization transmittance and the transverse magnetic polarization transmittance.

[0122] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0123] Step S43: Determine the initial electric field value, the initial magnetic field value, the step length and the preset condition in the target light data.

[0124] Step S44: Based on the initial electric field value, the initial magnetic field value, the step size and the preset conditions, the electric field value at the target moment and the magnetic field value at the target moment are calculated.

[0125] Step S45: Determine the light field distribution data based on the electric field value at the target time and the magnetic field value at the target time.

[0126] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0127] Step S60 : obtaining a target refractive index distribution of the coupler 110 of the polarization beam splitter structure 100 .

[0128] Step S61: Based on the target refractive index distribution and the objective function, an initial optimized value of the objective function and a simulated structure of the polarization beam splitter are obtained.

[0129] In one embodiment, when the processor executes the computer program, the processor further implements the following steps:

[0130] Step S10: Display the simulation structure.

[0131] In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0132] Step S2: acquiring target light data incident on the waveguide 120 .

[0133] Step S4: determining the target functions of the transverse electric waveguide 130 and the transverse magnetic waveguide 140 based on the target light data of the incident waveguide 120 .

[0134] Step S6: Based on the preset optimization algorithm and the objective function, an initial optimization value of the objective function and a simulation structure of the polarization beam splitter are obtained.

[0135] Step S8: Based on the simulated structure and the objective function, the optimization value is updated until the size of the simulated structure is no larger than a preset size, and the simulated structure is used as the polarization beam splitter structure 100 .

[0136] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0137] Step S40: determining light field distribution data of the target light data based on the target light data.

[0138] Step S41: based on the light field distribution data, the transverse electric polarization transmittance of the transverse electric waveguide 130 and the transverse magnetic polarization transmittance of the transverse magnetic waveguide 140 are obtained.

[0139] Step S42: Determine the objective functions of the transverse electric waveguide 130 and the transverse magnetic waveguide 140 based on the transverse electric polarization transmittance and the transverse magnetic polarization transmittance.

[0140] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0141] Step S43: Determine the initial electric field value, the initial magnetic field value, the step length and the preset condition in the target light data.

[0142] Step S44: Based on the initial electric field value, the initial magnetic field value, the step size and the preset conditions, the electric field value at the target moment and the magnetic field value at the target moment are calculated.

[0143] Step S45: Determine the light field distribution data based on the electric field value at the target time and the magnetic field value at the target time.

[0144] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0145] Step S60 : obtaining a target refractive index distribution of the coupler 110 of the polarization beam splitter structure 100 .

[0146] Step S61: Based on the target refractive index distribution and the objective function, an initial optimized value of the objective function and a simulated structure of the polarization beam splitter are obtained.

[0147] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0148] Step S10: Display the simulation structure.

[0149] In one embodiment, a computer program product is provided, comprising a computer program, which, when executed by a processor, implements the following steps:

[0150] Step S2: acquiring target light data incident on the waveguide 120 .

[0151] Step S4: determining the target functions of the transverse electric waveguide 130 and the transverse magnetic waveguide 140 based on the target light data of the incident waveguide 120 .

[0152] Step S6: Based on the preset optimization algorithm and the objective function, an initial optimization value of the objective function and a simulation structure of the polarization beam splitter are obtained.

[0153] Step S8: Based on the simulated structure and the objective function, the optimization value is updated until the size of the simulated structure is no larger than a preset size, and the simulated structure is used as the polarization beam splitter structure 100 .

[0154] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0155] Step S40: determining light field distribution data of the target light data based on the target light data.

[0156] Step S41: based on the light field distribution data, the transverse electric polarization transmittance of the transverse electric waveguide 130 and the transverse magnetic polarization transmittance of the transverse magnetic waveguide 140 are obtained.

[0157] Step S42: Determine the objective functions of the transverse electric waveguide 130 and the transverse magnetic waveguide 140 based on the transverse electric polarization transmittance and the transverse magnetic polarization transmittance.

[0158] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0159] Step S43: Determine the initial electric field value, the initial magnetic field value, the step length and the preset condition in the target light data.

[0160] Step S44: Based on the initial electric field value, the initial magnetic field value, the step size and the preset conditions, the electric field value at the target moment and the magnetic field value at the target moment are calculated.

[0161] Step S45: Determine the light field distribution data based on the electric field value at the target time and the magnetic field value at the target time.

[0162] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0163] Step S60 : obtaining a target refractive index distribution of the coupler 110 of the polarization beam splitter structure 100 .

[0164] Step S61: Based on the target refractive index distribution and the objective function, an initial optimized value of the objective function and a simulated structure of the polarization beam splitter are obtained.

[0165] In one embodiment, when the computer program is executed by a processor, the following steps are also implemented:

[0166] Step S10: Display the simulation structure.

[0167] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0168] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0169] In the description of this specification, the description with reference to the terms "some embodiments", "other embodiments", "ideal embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner. It should be understood that "this embodiment" or "one embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present disclosure. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification may not necessarily refer to the same embodiment.

[0170] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features of the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0171] The embodiments described above only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all fall within the scope of protection of the present application. Therefore, the scope of protection of the patent of the present application shall be subject to the attached claims. The above description is only a preferred implementation method of the present disclosure, and does not limit the scope of the patent of the present disclosure. All equivalent structural transformations made by using the contents of the present disclosure specification and drawings under the inventive concept of the present disclosure, or direct / indirect application in other related technical fields are included in the scope of protection of the patent of the present disclosure.

Claims

1. A method for generating a polarization beam splitter structure, characterized in that: The polarization beam splitter structure comprises a coupler, an incident waveguide, a transverse electric waveguide and a transverse magnetic waveguide, the input end of the coupler is connected to the incident waveguide, and the two output ends of the coupler are respectively connected to the transverse electric waveguide and the transverse magnetic waveguide. The method for generating the polarization beam splitter structure comprises: Acquiring target light data of the incident waveguide; Determine the target functions of the transverse electric waveguide and the transverse magnetic waveguide based on the target light data of the incident waveguide; Based on a preset optimization algorithm and the objective function, obtaining an initial optimization value of the objective function and a simulation structure of the polarization beam splitter; Based on the simulation structure and the objective function, the optimization value is updated until the size of the simulation structure is no larger than a preset size, and the simulation structure is used as the polarization beam splitter structure.

2. The method for generating a polarization beam splitter structure according to claim 1, characterized in that: The determining of the target functions of the transverse electric waveguide and the transverse magnetic waveguide based on the target light data of the incident waveguide comprises: Based on the target light data, determining light field distribution data of the target light data; Based on the light field distribution data, a transverse electric polarization transmittance of the transverse electric waveguide and a transverse magnetic polarization transmittance of the transverse magnetic waveguide are obtained; Based on the transverse electric polarization transmittance and the transverse magnetic polarization transmittance, objective functions of the transverse electric waveguide and the transverse magnetic waveguide are determined.

3. The method for generating a polarization beam splitter structure according to claim 2, characterized in that: The determining the objective functions of the transverse electric waveguide and the transverse magnetic waveguide based on the transverse electric polarization transmittance and the transverse magnetic polarization transmittance comprises: Based on the transverse electric polarization transmittance T1, determining the objective function of the transverse electric waveguide as 1-T1; Based on the transverse magnetic polarization transmittance T2, the objective function of the transverse magnetic waveguide is determined to be 1-T2.

4. The method for generating a polarization beam splitter structure according to claim 2, characterized in that: The step of determining the light field distribution data of the target light data based on the target light data includes: Determining an initial electric field value, an initial magnetic field value, a step length, and a preset condition in the target light data; Based on the initial electric field value, the initial magnetic field value, the step size and the preset conditions, calculating the electric field value at the target time and the magnetic field value at the target time; The light field distribution data is determined based on the electric field value at the target moment and the magnetic field value at the target moment.

5. The method for generating a polarization beam splitter structure according to claim 1, characterized in that: The step of obtaining an initial optimized value of the objective function and a simulated structure of the polarization beam splitter based on a preset optimization algorithm and the objective function comprises: Acquire a target refractive index distribution of a coupler of the polarization beam splitter structure; Based on the target refractive index distribution and the objective function, an initial optimized value of the objective function and a simulated structure of the polarization beam splitter are obtained.

6. The method for generating a polarization beam splitter structure according to claim 1, characterized in that: The preset optimization algorithm includes a topology optimization algorithm.

7. The method for generating a polarization beam splitter structure according to claim 1, characterized in that: The method of updating the optimization value based on the simulation structure and the objective function until the size of the simulation structure is no greater than a preset size and using the simulation structure as the polarization beam splitter structure comprises: The simulated structure is shown.

8. The method for generating a polarization beam splitter structure according to claim 1, characterized in that: The preset size is no greater than 6 μm×4 μm.

9. The method for generating a polarization beam splitter structure according to claim 1, characterized in that: The wavelength band of the incident light of the incident waveguide is between 1500nm and 1600nm.

10. A polarization beam splitter structure, characterized in that: include: Incident waveguide; A coupler, wherein the incident waveguide is connected to an input end of the coupler, and the coupler is obtained by using the method for generating a polarization beam splitter structure according to any one of claims 1 to 9; a transverse electric waveguide connected to an output end of the coupler; A transverse magnetic waveguide is connected to the output end of the coupler.

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