Polarization beam splitter structure and method of generating the same

Abstract

This disclosure relates to the field of polarization beamsplitter technology, and in particular to a polarization beamsplitter structure and its generation method. The polarization beamsplitter structure includes 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 output end of the coupler is connected to the transverse electric waveguide and the transverse magnetic waveguide. The generation method of the polarization beamsplitter structure includes: acquiring target light data from the incident waveguide; determining objective functions for the transverse electric waveguide and the transverse magnetic waveguide; obtaining initial optimized values ​​of the objective functions and a simulated structure of the polarization beamsplitter based on a preset optimization algorithm and the objective functions; updating the optimized values ​​based on the simulated structure and the objective functions until the size of the simulated structure is no larger than a preset size, and using the simulated structure as the polarization beamsplitter structure. By iterating and updating the optimized values ​​multiple times, minor adjustments to the simulated structure can be achieved.

Description

Technical Field

[0001] This disclosure relates to the field of polarization beam splitter technology, and in particular to a polarization beam splitter structure and its generation method. Background Technology

[0002] In communication technology, to improve communication capacity, transverse electric (TE) and transverse magnetic (TM) modes are commonly used to transmit optical information. The polarization beamsplitter (PBS) is the most important functional device in this technology. A polarization beamsplitter is used to separate light beams with different polarization states into two distinct beams. Typically, it separates the transverse electric and transverse magnetic modes in the incident light, causing them to propagate in different directions. Currently, commonly used on-chip polarization beams mainly include multi-mode interference (MMI) type, directional coupler (DC) type, photonic crystal (PhC) type, and Mach-Zehnder interferometers (MZIs) type.

[0003] On-chip integrated photonic devices are rapidly developing towards higher density and integration, and reducing the structural size of the devices is one of the key ways to achieve this goal. However, the current polarization beam splitters have a large footprint, which limits their application in highly integrated photonic chips. Summary of the Invention

[0004] Therefore, it is necessary to provide a polarization beam splitter structure and its generation method to address the problem of miniaturization of existing polarization beam splitters.

[0005] To achieve the above objectives, a method for generating a polarization beam splitter structure is provided.

[0006] The polarization beam splitter structure includes 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 includes:

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

[0008] Based on the target light data of the incident waveguide, the target functions of the transverse electric waveguide and the transverse magnetic waveguide are determined.

[0009] Based on the preset optimization algorithm and the objective function, the initial optimized value of the objective function and the simulated structure of the polarization beam splitter are obtained;

[0010] 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 the preset size, and the simulated 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, determine the light field distribution data of the target light data;

[0013] Based on the optical field distribution data, the transverse electric polarization transmittance of the transverse electric waveguide and the 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, the objective functions of the transverse electric waveguide and the transverse magnetic waveguide are determined.

[0015] In one embodiment, determining the target function 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, the objective function of the transverse electric waveguide is determined to be 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 embodiment, determining the light field distribution data of the target light data based on the target light data includes:

[0019] The initial electric field value, initial magnetic field value, step size, and preset conditions are determined from the target light data;

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

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

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

[0023] Obtain the target refractive index distribution of the coupler in the polarization beam splitter structure;

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

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

[0026] In one embodiment, the step of updating the optimization value based on the simulated structure and the objective function until the size of the simulated structure is no larger than a preset size, and then using the simulated structure as the polarization beam splitter structure, includes:

[0027] The simulated structure is shown.

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

[0029] In one embodiment, the incident light of the incident waveguide is in the wavelength range of 1500nm-1600nm.

[0030] On the one hand, a polarization beam splitter structure is provided, comprising:

[0031] Incident waveguide;

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

[0033] A transverse electric waveguide is connected to the output of the coupler;

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

[0035] The polarization beamsplitter structure and its generation method described in this specification have the following beneficial effects: First, by updating the optimized values ​​based on the simulated structure and objective function until the size of the simulated structure is no larger than a preset size, and through iterative updates of the optimized values, minute adjustments to the simulated structure can be achieved to reduce the size of the polarization beamsplitter structure and improve its polarization separation performance. Second, by setting the objective function, the separation effect of transverse electric and transverse magnetic modes can be optimized while reducing the size of the polarization beamsplitter structure, thereby ensuring the efficiency of the polarization beamsplitter structure. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments or conventional technologies of this disclosure, the accompanying drawings used in the description of the embodiments or conventional technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

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

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

[0039] Figure 3 This is a flowchart of a method for generating a polarization beam splitter structure provided in one embodiment;

[0040] Figure 4 This is a flowchart of a method for generating a polarization beam splitter structure provided in another embodiment;

[0041] Figure 5 A flowchart 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 for the polarization beam splitter structure.

[0043] Figure 7 This is a schematic diagram showing the test results of another polarization beam splitter structure.

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

[0045] Figure 9 This is an internal structural diagram of a computer device in one embodiment.

[0046] Explanation of reference numerals in the attached figures: Polarization beam splitter structure - 100; Coupler - 110; Incident waveguide - 120; Transverse electric waveguide - 130; Transverse magnetic waveguide - 140; Substrate - 150.

[0047] To better describe and illustrate embodiments and examples of the inventions disclosed herein, reference may be made to one or more accompanying drawings. 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, or the best mode of these inventions as currently understood. Detailed Implementation

[0048] To facilitate understanding of this disclosure, a more complete description will now be given with reference to the accompanying drawings, in which preferred embodiments of the present disclosure are shown. However, this disclosure may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

[0049] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure.

[0050] In each embodiment, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in each embodiment according to the specific circumstances.

[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 may be directly on, adjacent to, connected to, or coupled to other elements or layers, or there may be intervening elements or layers. Conversely, when an element is referred to as "directly on," "directly adjacent to," "directly connected to," or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc., may be used to describe various elements, components, areas, layers, and portions, these elements, components, areas, layers, and portions should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer, or portion from another element, component, area, layer, or portion. Therefore, without departing from the teachings of this embodiment, the first element, component, area, layer, or portion discussed below may be referred to as a second element, component, area, layer, or portion.

[0052] Spatial relation terms such as “below,” “under,” “below,” “under,” “above,” “above,” etc., are used herein to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as “below,” “under,” or “below” will be oriented “above” the other element or feature. Therefore, the exemplary terms “below” and “under” can include both above and below orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein will be interpreted accordingly.

[0053] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that when the terms “comprise” and “comprising” are used in this specification, the presence of the stated features, integers, steps, operations, elements, and parts is confirmed, but the presence or addition of one or more other features, integers, steps, operations, elements, parts, and groups is not excluded. Meanwhile, when used herein, the term “and” includes any and all combinations of the associated listed items.

[0054] Embodiments of this specification are described herein with reference to schematic diagrams that serve as ideal embodiments (and simulated structures). Variations in the illustrated shapes due to, for example, manufacturing techniques and tolerances are to be expected. Therefore, embodiments of this specification should not be limited to the specific shapes of the regions shown herein, but should include shape deviations due to, for example, manufacturing techniques. The regions shown in the figures are substantially schematic, and their shapes do not represent the actual shapes of regions of the device, nor do they limit the scope of embodiments of this specification.

[0055] Please see Figure 1 In one embodiment, a polarization beamsplitter structure 100 is provided. The polarization beamsplitter structure 100 includes 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 of coupler 110 is connected to the incident waveguide 120, and the output of coupler 110 is connected to the transverse electric waveguide 130 and the transverse magnetic waveguide 140. As an example, coupler 110 may include a multimode interference coupler, which, by designing appropriate waveguide widths and lengths, allows the transverse electric and transverse magnetic modes of the optical field to have different propagation constants (i.e., different phase velocities) within coupler 110. This difference causes the transverse electric mode and the transverse magnetic mode optical fields to converge at different locations at the end of the multimode interference coupler. For example, the transverse electric mode optical field converges at the transverse electric waveguide 130, and the transverse magnetic mode optical field converges at the transverse magnetic waveguide 140, thereby achieving polarization beam splitting. See also... Figure 2 By setting the material distribution or geometry of the coupler 110 of the polarization beamsplitter structure 100, a polarization beamsplitter structure 100 with better efficiency can be obtained. The method for generating the polarization beamsplitter structure 100 provided in one or more of the following embodiments can generate a polarization beamsplitter 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 can be applied to a terminal or a server. The terminal can be, but is not limited to, various personal computers, laptops, smartphones, tablets, etc. The server can be an independent physical server, a server cluster or distributed system composed of multiple physical servers, or a cloud server providing cloud computing services.

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

[0059] Step S2: Acquire the target light data of the incident waveguide 120.

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

[0061] Step S6: Based on the preset optimization algorithm and objective function, obtain the initial optimized value of the objective function and the simulated structure of the polarization beam splitter.

[0062] Step S8: Based on the simulated structure and objective function, update the optimization value until the size of the simulated structure is no larger than the preset size, and use the simulated structure 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 the polarization state, intensity, and wavelength of the target light.

[0064] In step S4, the objective functions for the transverse electric waveguide 130 and the transverse magnetic waveguide 140 can be determined based on the polarization transmittance of the transverse electric mode and 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 of the objective function.

[0065] In step S6, the preset optimization algorithm may include a gradient-based topology optimization algorithm. 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] Solving the preset optimization algorithm and objective function yields the initial optimized values ​​of the objective function and the simulated structure of the polarization beamsplitter. The simulated structure of the polarization beamsplitter can include the material distribution or geometry of the coupler 110. As an example, the coupler 110 can include a central portion located in the intermediate region and a peripheral portion surrounding the central portion. The geometry of the coupler 110 can include specific parameters such as the length, width, and height of the central portion and the peripheral portion. Alternatively, the geometry of the coupler 110 can also include the shapes of the central portion and the peripheral portion, etc.

[0067] In step S8, based on the obtained simulation structure, the length, width, and separation effect of the simulation results can be obtained. The objective function is then used again to obtain new optimized values. This step can be performed multiple times, iterating to update the optimized values ​​repeatedly until the size of the simulation structure is no larger than a preset size. At this point, the simulation structure can be used as the polarization beam splitter structure 100. In each iteration, the optimized values ​​are updated based on 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, the simulated structure is used as polarization beam splitter structure 100 until the size of the simulated structure is no larger than 6μm × 4μm. The above data is only an example, and in actual embodiments, the size of the simulated structure is not limited to the above data.

[0069] In this embodiment, firstly, 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. This process is repeated iteratively to update the optimization value multiple times, thereby achieving a minor adjustment to the simulated structure, reducing the size of the polarization beamsplitter structure 100, and improving its polarization separation performance. Secondly, by setting the objective function, the separation effect of the transverse electric mode and transverse magnetic mode can be optimized while reducing the size of the polarization beamsplitter structure 100, thus ensuring the efficiency of the polarization beamsplitter structure 100.

[0070] In one embodiment, see Figure 4 Step S4 includes:

[0071] Step S40: Based on the target light data, determine the light field distribution data of the target light data.

[0072] Step S41: Based on the optical field distribution 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.

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

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

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

[0076] In this embodiment, the target 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 transverse electric mode and transverse magnetic mode transmittance.

[0077] In one embodiment, see Figure 5 Step S4 includes:

[0078] Step S43: Determine the initial electric field value, initial magnetic field value, step size, and preset conditions from the target light data.

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

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

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

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

[0083] In one embodiment, step S6 includes:

[0084] Step S60: Obtain the 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, obtain the initial optimized value of the objective function and the simulated structure of the polarization beam splitter.

[0086] In steps S60 to S61, the target refractive index distribution can refer to the refractive index of the coupler 110 of the polarization beamsplitter structure 100 necessary to achieve the expected performance under the conditions of the target optical data. The coupler 110 of the polarization beamsplitter structure 100 can have multiple partitions, each partition can have a target refractive index distribution. Subsequently, based on the target refractive index distribution, the objective function, and the constraints, the initial optimized value of the objective function and the simulated structure of the polarization beamsplitter can be obtained.

[0087] In this embodiment, by determining the target refractive index distribution of the coupler 110, the initial optimized value of the objective function is determined 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 is included:

[0089] Step S10: Display the simulated structure.

[0090] As an example, each simulated structure can be displayed on the monitor, and specifically, the parameters of each simulated structure can also be displayed. For example, the length and width of each simulated structure can be displayed on the monitor, or the simulation results of each simulated structure can be displayed, etc.

[0091] In this embodiment, by displaying the simulated structure on the display, the geometry or material distribution of the simulated structure can be clearly shown, thereby determining whether further iterations are needed.

[0092] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0093] Based on the same inventive concept, in one embodiment, a polarization beamsplitter structure 100 is provided. The polarization beamsplitter 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 incident light wavelength of the polarization beamsplitter structure 100 is between 1500 nm and 1600 nm. The coupler 110 can be obtained using the generation method of the polarization beamsplitter structure 100 provided in any of the foregoing embodiments. Specifically, the coupler 110 can have a geometrical distribution. As an example, the size of the coupler 110 can be no greater than 6 μm × 4 μm. The transverse electric waveguide 130 and the transverse magnetic waveguide 140 are respectively connected to the output end 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 examples; in actual embodiments, the size of the simulated structure and the wavelength of the incident light of the polarization beamsplitter structure 100 are not limited to the above data.

[0095] In this embodiment, the coupler 110 can be obtained by using the generation method of the polarization beam splitter structure 100 provided in any one or more of the foregoing embodiments, thereby obtaining a smaller coupler 110 size, which is beneficial to the miniaturization of the polarization beam splitter structure 100.

[0096] like Figure 6 and Figure 7 As shown, the polarization beamsplitter structure 100 provided by one or more embodiments and combinations thereof in this application can achieve an output transmittance of -0.3 dB and -0.2 dB for the transverse electric waveguide and the transverse magnetic waveguide, respectively. Furthermore, the polarization extinction ratios of the transversely polarized light and the transversely magnetic polarized light exceed 21 dB and 22 dB, respectively, across the entire wavelength range. Therefore, the polarization beamsplitter structure provided by this application not only exhibits high transmittance but also demonstrates superior performance in terms of wide bandwidth and high polarization extinction ratio, providing strong support for the multifunctional applications of on-chip integrated photonic devices.

[0097] Therefore, the polarization beam splitter provided in this application has a smaller structure and better performance.

[0098] Based on the same inventive concept, this application also provides an apparatus for generating a polarization beamsplitter structure 100 to implement the above-described method for generating the polarization beamsplitter structure 100. The solution provided by this apparatus is similar to the solution described in the above method. Therefore, the specific limitations of one or more embodiments of the apparatus for generating a polarization beamsplitter structure 100 provided below can be found in the limitations of the method for generating the polarization beamsplitter structure 100 described above, and will not be repeated here.

[0099] In one embodiment, such as 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 the 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 optical data of the incident waveguide 120.

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

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

[0104] In one embodiment, the determining module is further configured to determine the optical field distribution data of the target optical data based on the target optical 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 optical 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 determining module is further configured 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 determining module is further configured to determine the initial electric field value, the initial magnetic field value, the step size, and preset conditions in the target light data; calculate the electric field value and the magnetic field value at the target time 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 and the magnetic field value at the target time.

[0107] In one embodiment, the second acquisition module is further configured 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 apparatus for generating the polarization beam splitter structure 100 includes a display module for displaying the simulated structure.

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

[0111] In one exemplary embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as follows: Figure 9As shown, the computer device includes a processor, memory, input / output interface, communication interface, display unit, and input device. The processor, memory, and input / output interface are connected via a system bus, and the communication interface, display unit, and input device are also connected to the system bus via the input / output interface. The processor provides computing and control capabilities. The memory includes a non-volatile storage medium and internal memory. The non-volatile storage medium stores the operating system and computer programs. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage medium. The input / output interface is used for exchanging information between the processor and external devices. The communication interface is used for wired or wireless communication with external terminals; wireless communication can be achieved through Wi-Fi, mobile cellular networks, Near Field Communication (NFC), or other technologies. When the computer program is executed by the processor, it implements a method for generating a polarization beam splitter structure 100. The display unit of the computer device is used to form a visually visible image and can be a display screen, a projection device, or a virtual reality imaging device. The display screen can be an LCD screen or an e-ink screen. The input device of the computer device can be a touch layer covering the display screen, or buttons, trackballs, or touchpads set on the casing of the computer device, or external keyboards, touchpads, or mice, etc.

[0112] Those skilled in the art will understand that Figure 9 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0113] In one exemplary embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to perform the following steps:

[0114] Step S2: Acquire the target light data of the incident waveguide 120.

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

[0116] Step S6: Based on the preset optimization algorithm and objective function, obtain the initial optimized value of the objective function and the simulated structure of the polarization beam splitter.

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

[0118] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0119] Step S40: Based on the target light data, determine the light field distribution data of the target light data.

[0120] Step S41: Based on the optical field distribution 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.

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

[0122] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0123] Step S43: Determine the initial electric field value, initial magnetic field value, step size, and preset conditions from the target light data.

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

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

[0126] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0127] Step S60: Obtain the 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, obtain the initial optimized value of the objective function and the simulated structure of the polarization beam splitter.

[0129] In one embodiment, the processor, when executing a computer program, also performs the following steps:

[0130] Step S10: Display the simulated structure.

[0131] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, the computer program performing the following steps when executed by a processor:

[0132] Step S2: Acquire the target light data of the incident waveguide 120.

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

[0134] Step S6: Based on the preset optimization algorithm and objective function, obtain the initial optimized value of the objective function and the simulated structure of the polarization beam splitter.

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

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

[0137] Step S40: Based on the target light data, determine the light field distribution data of the target light data.

[0138] Step S41: Based on the optical field distribution 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.

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

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

[0141] Step S43: Determine the initial electric field value, initial magnetic field value, step size, and preset conditions from the target light data.

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

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

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

[0145] Step S60: Obtain the 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, obtain the initial optimized value of the objective function and the simulated structure of the polarization beam splitter.

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

[0148] Step S10: Display the simulated structure.

[0149] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, performs the following steps:

[0150] Step S2: Acquire the target light data of the incident waveguide 120.

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

[0152] Step S6: Based on the preset optimization algorithm and objective function, obtain the initial optimized value of the objective function and the simulated structure of the polarization beam splitter.

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

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

[0155] Step S40: Based on the target light data, determine the light field distribution data of the target light data.

[0156] Step S41: Based on the optical field distribution 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.

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

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

[0159] Step S43: Determine the initial electric field value, initial magnetic field value, step size, and preset conditions from the target light data.

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

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

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

[0163] Step S60: Obtain the 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, obtain the initial optimized value of the objective function and the simulated structure of the polarization beam splitter.

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

[0166] Step S10: Display the simulated 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, data stored, data displayed, 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 the relevant data must comply with relevant regulations.

[0168] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this 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. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, artificial intelligence (AI) processors, etc., and are not limited to these.

[0169] In the description of this specification, references to terms such as "some embodiments," "other embodiments," "ideal embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative descriptions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. It should be understood that the phrase "this embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this disclosure. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification do not necessarily refer to the same embodiment.

[0170] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features of the above 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 are merely examples of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims. The above descriptions are merely preferred embodiments of this disclosure and do not limit the patent scope of this disclosure. Any equivalent structural transformations made based on the inventive concept of this disclosure, utilizing the content of this specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this disclosure.

Claims

1. A method for generating a polarization beam splitter structure, characterized in that, The polarization beam splitter structure includes 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 includes: Acquire the target light data of the incident waveguide; Based on the target light data of the incident waveguide, the target functions of the transverse electric waveguide and the transverse magnetic waveguide are determined. Based on the preset optimization algorithm and the objective function, the initial optimized value of the objective function and the simulated structure of the polarization beam splitter are obtained; 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 the preset size, and the simulated structure is used as the polarization beam splitter structure.

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

3. The method for generating the polarization beam splitter structure according to claim 2, characterized in that, The determination of the target function for the transverse electric waveguide and the transverse magnetic waveguide based on the transverse electric polarization transmittance and the transverse magnetic polarization transmittance includes: Based on the transverse electric polarization transmittance T1, the objective function of the transverse electric waveguide is determined to be 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 the polarization beam splitter structure according to claim 2, characterized in that, The determination of the light field distribution data of the target light data based on the target light data includes: The initial electric field value, initial magnetic field value, step size, and preset conditions are determined from the target light data; Based on the initial electric field value, initial magnetic field value, step size, and preset conditions, calculate the electric field value and magnetic field value at the target time. The light field distribution data is determined based on the electric field value and the magnetic field value at the target time.

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

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

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

9. The method for generating the polarization beam splitter structure according to claim 1, characterized in that, The incident light in the incident waveguide has a wavelength range of 1500nm-1600nm.

10. A polarization beam splitter structure, characterized in that, include: Incident waveguide; A coupler, wherein the incident waveguide is connected to the 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 claims 1-9; A transverse electric waveguide is connected to the output of the coupler; A transverse magnetic waveguide is connected to the output of the coupler.

Images