Implementation method and system of flexible fluorescent condenser visible light communication system

Abstract

The invention provides an implementation method and system of a flexible fluorescent condenser visible light communication system, and relates to the technical field of data processing, and the method comprises the steps: taking a perovskite thin film as a core light receiving element, and carrying out the processing with a light source driving module, an optical lens group, a photoelectric detector and a signal analysis instrument, so as to generate a light signal receiving device; the method comprises the following steps: setting two fixed detection points on an optical signal receiving device, establishing a reference axis according to the two detection points, performing gridding segmentation on the reference axis, and generating a communication performance adjustment value by adopting a multi-target particle swarm optimization algorithm; and according to the communication performance adjustment value, the light current output by the perovskite thin film is demodulated and analyzed when the optical signal receiving device runs, and the optical communication rate with the field angle larger than + / -30 degrees, the bandwidth of 197.9 MHz and the 432 Mbps is achieved. The photoelectric property stability and the light absorption efficiency of the thin film are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of data processing, and in particular to a method and system for realizing a flexible fluorescent concentrator visible light communication system. Background Art

[0002] The rapid development of 5G communication technology and the rise of emerging fields such as the Internet of Things and intelligent transportation are placing higher demands on the bandwidth, speed, and security of wireless communications. Traditional RF communications face spectrum resource constraints and electromagnetic interference bottlenecks. An optical communication system primarily consists of a light source transmitter module, an optical transmission channel, and an optical receiver module. As the core of signal detection and conversion, the performance of the optical receiver module directly determines the key indicators of the communication system, including bandwidth, speed, and field of view.

[0003] Currently, some visible light communication systems use silicon-based photodetectors as receiving elements, which may be limited by rigid structures and difficult to adapt to the needs of emerging applications such as flexible wearable devices and curved carriers. Traditional optical receiving modules have a small field of view. When there is an angular offset between the light source and the receiving end, it can easily lead to severe signal attenuation and reduced communication stability. Therefore, developing a high-efficiency fluorescent concentrator visible light communication system based on flexible perovskite materials, through optimized device structure design and multi-parameter coordinated control, is of great significance for promoting the application of visible light communication in flexible electronics and the smart Internet of Things. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method and system for realizing a flexible fluorescent concentrator visible light communication system, thereby improving the photoelectric performance stability and light absorption efficiency of the film.

[0005] In order to solve the above technical problems, the technical solutions of the present invention are as follows:

[0006] In a first aspect, a method for implementing a flexible fluorescent concentrator visible light communication system is provided, the method comprising:

[0007] Step 1: forming a polyimide flexible substrate on an ITO glass substrate, and sequentially depositing a PMMA layer, a PTAA layer, a ligand passivation layer, and a quasi-two-dimensional perovskite precursor solution to obtain a perovskite film;

[0008] Step 2: Using the perovskite film as the core light receiving element, it is processed with a light source driving module, an optical lens group, a photodetector, and a signal analysis instrument to generate an optical signal receiving device;

[0009] Step 3: Set two fixed detection points on the optical signal receiving device, establish a reference axis based on the two detection points, perform grid segmentation on the reference axis, and use a multi-objective particle swarm optimization algorithm to generate a communication performance adjustment value;

[0010] Step 4: Based on the communication performance adjustment value, the photocurrent output by the perovskite film is demodulated and analyzed when the optical signal receiving device is running, achieving a field of view angle greater than ±30°, a bandwidth of 197.9 MHz, and an optical communication rate of 432 Mbps.

[0011] Furthermore, a polyimide flexible substrate is formed on an ITO glass substrate, and a PMMA layer, a PTAA layer, a ligand passivation layer, and a quasi-two-dimensional perovskite precursor solution are sequentially deposited to obtain a perovskite film, comprising:

[0012] A polyimide solution is spin-coated on a clean ITO conductive glass surface, and the substrate is heated and cured to form a polyimide base layer on the ITO glass. The ITO glass with the polyimide flexible base is placed in a spin-coating device, and a polymethyl methacrylate solution is spin-coated on the polyimide layer surface. After spin-coating, a drying treatment is performed under specific conditions to form a smooth PMMA film on the polyimide base.

[0013] A substrate with a PMMA layer is placed in a spin coating device, PTAA is spin-coated on the surface of the PMMA layer, and an annealing treatment is performed under specific conditions after spin coating to form a uniform hole transport layer on the PMMA layer; a substrate with a PTAA layer is placed in a spin coating device, a passivation solution containing specific ligand molecules is spin-coated on the surface of the PTAA layer, and a low-temperature heat treatment is performed under specific conditions after spin coating to form a ligand passivation layer on the surface of the PTAA layer; a substrate with a ligand passivation layer is placed in a spin coating device, a quasi-two-dimensional perovskite precursor solution is spin-coated on the surface of the ligand passivation layer, and after the spin coating is completed, the wet film is immediately subjected to an anti-solvent rapid extraction treatment under specific conditions; the anti-solvent-treated substrate is placed on a hot plate for a thermal annealing treatment at a specific temperature and time, and a perovskite film is successfully crystallized on the ligand passivation layer.

[0014] Furthermore, the perovskite film is used as the core light receiving element and processed with a light source driving module, an optical lens group, a photodetector and a signal analysis instrument to generate an optical signal receiving device, including:

[0015] The perovskite film is used as a core light receiving element and fixed at the focal plane position of the optical lens group to obtain a positioning film; the light receiving surface of the positioning film is aligned with the output light path of the light source driving module to obtain a light path alignment film;

[0016] A photodetector is axially arranged at the output end of the optical lens group, so that the receiving light path of the photodetector is aligned with the fluorescent signal converged by the thin film through the optical lens group, so as to obtain a device with a detector; the current output end of the photodetector in the device with a detector is processed to obtain a signal integration device; the signal integration device is used to collect the response current to generate an optical signal receiving device.

[0017] Furthermore, two fixed detection points are set on the optical signal receiving device, a reference axis is established based on the two detection points, the reference axis is gridded, and a multi-objective particle swarm optimization algorithm is used to generate a communication performance adjustment value, including:

[0018] Based on the optical receiving plane of the optical signal receiving device, a first detection point and a second detection point are set at symmetrical positions on the edge to generate a receiving device with detection points; based on the receiving device with detection points, the spatial coordinates of the first detection point and the second detection point are connected to form a straight line passing through the center of the field of view to obtain reference axis positioning data;

[0019] The reference axis positioning data is segmented and processed to generate a gridded axis structure. Based on the gridded axis structure, three sets of parameters (optical lens focal length, light source drive signal intensity, and photodetector gain) are synchronously adjusted at each node. The corresponding communication bandwidth, rate, and field of view angle data are collected to obtain a performance parameter association set.

[0020] Based on the performance parameter association set, the three sets of parameter combinations are iteratively updated through the multi-objective particle swarm algorithm to generate the final communication performance adjustment value.

[0021] Furthermore, the first detection point is located at the midpoint of the first end in the long side direction of the plane, and is used to define the starting point of the reference axis space; the second detection point is located at the midpoint of the second end in the long side direction of the plane, and is used to define the end point of the reference axis space.

[0022] Furthermore, based on the performance parameter association set, the three sets of parameter combinations are iteratively updated through the multi-objective particle swarm algorithm to generate the final communication performance adjustment value, including:

[0023] Based on the performance parameter association set, the historical value ranges of the three sets of parameters and the corresponding communication bandwidth, rate, and field of view angle data are extracted, the initial value boundaries of the three sets of parameters are determined, and a particle swarm consisting of multiple particles is initialized. Each particle corresponds to a parameter combination of the focal length of the optical lens group, the light source driving signal intensity, and the photodetector gain.

[0024] Query the communication bandwidth, rate, and field of view data corresponding to the parameter combination in the performance parameter association set, and calculate the fitness value of each particle. Process the fitness value and filter out the parameter combination corresponding to the final fitness value in the entire particle swarm to obtain the global final solution.

[0025] According to the final solution, the speed of each particle is adjusted according to the speed update formula of the multi-objective particle swarm algorithm to obtain a new parameter combination; the new parameter combination is judged to generate the final communication performance adjustment value.

[0026] Furthermore, according to the communication performance adjustment value, the photocurrent output by the perovskite film is demodulated and analyzed during the operation of the optical signal receiving device, achieving a field of view angle greater than ±30°, a bandwidth of 197.9MHz, and an optical communication rate of 432Mbps, including:

[0027] According to the communication performance adjustment value, the focal length parameter of the optical lens group is processed to generate a parameter loading device; according to the parameter loading device, the light source driving module is started to transmit a modulated light signal, and the real-time photocurrent output by the perovskite film is collected through the signal integration device to generate an original current signal stream;

[0028] After pre-amplification and anti-aliasing filtering of the original current signal stream, frequency domain analysis data is generated. Based on the frequency domain analysis data, the -3dB cutoff frequency point is extracted as the actual bandwidth value to obtain the actual communication performance value.

[0029] The measured communication performance value is determined to have achieved the target optical communication performance when the actual bandwidth is ≥197.9MHz, the signal modulation rate is ≥432Mbps, and the field of view angle test value is >±30°.

[0030] In a second aspect, a system for implementing a flexible fluorescent concentrator visible light communication system includes:

[0031] A processing module forms a polyimide flexible substrate on an ITO glass substrate, and sequentially deposits a PMMA layer, a PTAA layer, a ligand passivation layer, and a quasi-two-dimensional perovskite precursor solution to obtain a perovskite film;

[0032] The receiving module uses the perovskite film as the core light receiving element and processes it with the light source driving module, optical lens group, photodetector and signal analysis instrument to generate an optical signal receiving device;

[0033] The optimization module sets two fixed detection points on the optical signal receiving device, establishes a reference axis based on the two detection points, performs grid segmentation on the reference axis, and uses a multi-objective particle swarm optimization algorithm to generate communication performance adjustment values;

[0034] The analysis module demodulates and analyzes the photocurrent output by the perovskite film according to the communication performance adjustment value when the optical signal receiving device is running, achieving a field of view angle greater than ±30°, a bandwidth of 197.9MHz and an optical communication rate of 432Mbps.

[0035] According to a third aspect, a computing device includes:

[0036] one or more processors;

[0037] The storage device is used to store one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors implement the method.

[0038] In a fourth aspect, a computer-readable storage medium stores a program, which implements the method when executed by a processor.

[0039] The above solution of the present invention includes at least the following beneficial effects:

[0040] The present invention sequentially deposits a PMMA layer, a PTAA layer, and a ligand passivation layer to construct a structure in which the PMMA layer provides a smooth substrate, the PTAA layer optimizes hole transport efficiency, and the ligand passivation layer suppresses defect states in the perovskite film. This effectively solves the problem that the crystallization quality of quasi-two-dimensional perovskite is affected by the substrate interface, improves the optoelectronic performance stability and light absorption efficiency of the film, and provides a reliable material foundation for efficient optical signal conversion.

[0041] A multi-objective particle swarm optimization algorithm is used to iteratively optimize the parameter combinations of the reference axis grid nodes, overcoming the limitations of traditional single-parameter debugging, which struggles to balance field of view, bandwidth, and rate. By establishing a multi-parameter collaborative control model, a globally optimal communication performance adjustment value can be quickly generated, ensuring that the system maintains stable high-performance output even under complex operating conditions, reducing manual debugging costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 The present invention provides a flow chart of a method for implementing a flexible fluorescent concentrator visible light communication system.

[0043] Figure 2 This is a schematic diagram of an implementation system of a flexible fluorescent concentrator visible light communication system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0044] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, the embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0045] like Figure 1 As shown, an embodiment of the present invention provides a method for implementing a flexible fluorescent concentrator visible light communication system, the method comprising the following steps:

[0046] Step 1: forming a polyimide flexible substrate on an ITO glass substrate, and sequentially depositing a PMMA layer, a PTAA layer, a ligand passivation layer, and a quasi-two-dimensional perovskite precursor solution to obtain a perovskite film;

[0047] Step 2: Using the perovskite film as the core light receiving element, it is processed with a light source driving module, an optical lens group, a photodetector, and a signal analysis instrument to generate an optical signal receiving device;

[0048] Step 3: Set two fixed detection points on the optical signal receiving device, establish a reference axis based on the two detection points, perform grid segmentation on the reference axis, and use a multi-objective particle swarm optimization algorithm to generate a communication performance adjustment value;

[0049] Step 4: Based on the communication performance adjustment value, the photocurrent output by the perovskite film is demodulated and analyzed when the optical signal receiving device is running, achieving a field of view angle greater than ±30°, a bandwidth of 197.9 MHz, and an optical communication rate of 432 Mbps.

[0050] In an embodiment of the present invention, the present invention sequentially deposits a PMMA layer, a PTAA layer, and a ligand passivation layer to construct a PMMA layer that provides a smooth substrate, a PTAA layer that optimizes hole transport efficiency, and a ligand passivation layer that suppresses defect states in the perovskite film. This effectively solves the problem that the crystallization quality of quasi-two-dimensional perovskite is affected by the substrate interface, improves the photoelectric performance stability and light absorption efficiency of the film, and provides a reliable material basis for efficient optical signal conversion.

[0051] A multi-objective particle swarm optimization algorithm is used to iteratively optimize the parameter combinations of the reference axis grid nodes, overcoming the limitations of traditional single-parameter debugging, which struggles to balance field of view, bandwidth, and rate. By establishing a multi-parameter collaborative control model, a globally optimal communication performance adjustment value can be quickly generated, ensuring that the system maintains stable high-performance output even under complex operating conditions, reducing manual debugging costs.

[0052] In a preferred embodiment of the present invention, a polyimide flexible substrate is formed on an ITO glass substrate, and a PMMA layer, a PTAA layer, a ligand passivation layer, and a quasi-two-dimensional perovskite precursor solution are sequentially deposited to obtain a perovskite film, comprising:

[0053] A polyimide solution is spin-coated on a clean ITO conductive glass surface, and the substrate is heated and cured to form a polyimide base layer on the ITO glass. The ITO glass with the polyimide flexible base is placed in a spin-coating device, and a polymethyl methacrylate solution is spin-coated on the polyimide layer surface. After spin-coating, a drying treatment is performed under specific conditions to form a smooth PMMA film on the polyimide base.

[0054] A substrate with a PMMA layer is placed in a spin coating device, PTAA is spin-coated on the surface of the PMMA layer, and an annealing treatment is performed under specific conditions after spin coating to form a uniform hole transport layer on the PMMA layer; a substrate with a PTAA layer is placed in a spin coating device, a passivation solution containing specific ligand molecules is spin-coated on the surface of the PTAA layer, and a low-temperature heat treatment is performed under specific conditions after spin coating to form a ligand passivation layer on the surface of the PTAA layer; a substrate with a ligand passivation layer is placed in a spin coating device, a quasi-two-dimensional perovskite precursor solution is spin-coated on the surface of the ligand passivation layer, and after the spin coating is completed, the wet film is immediately subjected to an anti-solvent rapid extraction treatment under specific conditions; the anti-solvent-treated substrate is placed on a hot plate for a thermal annealing treatment at a specific temperature and time, and a perovskite film is successfully crystallized on the ligand passivation layer.

[0055] In the embodiment of the present invention, a clean ITO conductive glass of 5 cm×5 cm was selected, 0.8 mL of a polyimide solution with a solid content of 15% was taken using a pipette, and the solution was spin-coated at a rotation speed of 4000 rpm for 30 seconds in a spin coating device.

[0056] The substrate was transferred to a vacuum drying oven and dried at 80°C for 12 minutes to remove the solvent. The temperature was then raised to 230°C at a heating rate of 8°C / min and kept at that temperature for 1.5 hours to complete the curing, forming a polyimide substrate with a thickness of 8μm. The thickness error was controlled within 3% after detection by a step profiler.

[0057] PMMA film preparation:

[0058] Prepare a 15 mg / mL PMMA (molecular weight 120,000) chlorobenzene solution, take 0.5 mL and drop it on the center of the polyimide substrate. Spin coat at 3000 rpm for 30 seconds. Immediately place it in a hot air oven and dry it at 65°C for 45 minutes to form a 70 nm thick PMMA film. The surface roughness measured by atomic force microscopy is 3 nm.

[0059] Preparation of PTAA hole transport layer:

[0060] A PTAA chlorobenzene solution (containing 2% lithium salt) with a concentration of 8 mg / mL was prepared, and 0.3 mL was spin-coated on the PMMA layer at 4000 rpm for 40 seconds. The solution was then transferred to a tube furnace and annealed at 110°C for 20 minutes under nitrogen protection to form a 35 nm thick hole transport layer. The hole mobility measured by the four-probe test reached 5×10 -3 cm 2 / (V·S).

[0061] Preparation of ligand passivation layer:

[0062] An isopropanol solution containing 8 mol% phenylethylamine ligand was prepared, and 0.3 mL was spin-coated on the surface of the PTAA layer at 2500 rpm for 25 seconds. The solution was then placed in a thermostat and heat-treated at 45°C for 15 minutes. X-ray photoelectron spectroscopy analysis showed that the ligand binding efficiency reached 92%, and the defect state density was reduced to 8×10 14 cm -3 .

[0063] Perovskite film preparation:

[0064] BA2Cs4Pb5Br 16 The precursor solution of 1.0 mol / L DMF / DMSO (volume ratio 4:1) was prepared in a stoichiometric ratio, and 0.4 mL was spin-coated on the surface of the passivation layer at 5000 rpm for 50 seconds; 8 seconds before the end of spin coating, the solution was heated at 0.2 mL / cm 2 Chlorobenzene antisolvent was added dropwise in an amount of 100 μg / min. After spin coating, the film was immediately transferred to a hot plate and annealed at 90°C for 15 minutes. Scanning electron microscopy showed that the grain size was 300 nm, the film coverage was 97%, and the light absorption coefficient at 550 nm was 1.2×10 5 cm -1 .

[0065] By precisely controlling the spin-coating speed, time, and solution dosage of each layer, the film thickness can be precisely controlled, ensuring smooth interfaces between layers and minimizing light scattering losses. Staged thermal curing and annealing improve the crystallinity and stability of each layer, reduce the density of defect states, and enhance the photoelectric conversion efficiency of the perovskite film. The synergistic effect of antisolvent treatment and thermal annealing promotes uniform growth of perovskite grains, improving the film's light absorption capacity and carrier transport properties, laying the foundation for efficient optical signal reception. The orderly preparation process for the multilayer structure exhibits excellent repeatability and operability, making it suitable for large-scale production and reducing the production cost of flexible light-receiving components.

[0066] In a preferred embodiment of the present invention, a perovskite film is used as a core light receiving element and is processed together with a light source driving module, an optical lens group, a photodetector, and a signal analysis instrument to generate an optical signal receiving device, including:

[0067] The perovskite film is used as a core light receiving element and fixed at the focal plane position of the optical lens group to obtain a positioning film; the light receiving surface of the positioning film is aligned with the output light path of the light source driving module to obtain a light path alignment film;

[0068] A photodetector is axially arranged at the output end of the optical lens group, so that the receiving light path of the photodetector is aligned with the fluorescent signal converged by the thin film through the optical lens group, so as to obtain a device with a detector; the current output end of the photodetector in the device with a detector is processed to obtain a signal integration device; the signal integration device is used to collect the response current to generate an optical signal receiving device.

[0069] In an embodiment of the present invention, a biconvex lens group with a focal length of 20 mm (diameter 25 mm, transmittance 95%) is selected, the focal plane position is calculated according to the lens focal length formula, and a 5 cm × 5 cm perovskite film is fixed on the focal plane 20 mm away from the center of the lens group using UV curing glue (thickness 0.1 mm); after curing, three points along the edge of the film are measured with a micrometer to confirm that the perpendicularity error between the film plane and the optical axis of the lens group is 0.015 mm, thereby obtaining a positioning film.

[0070] The light source driving module uses a blue light LED driving circuit (central wavelength 450nm, set output power 300mW) to fix the positioning film on a three-dimensional translation stage (accuracy 0.001mm); the laser is emitted through an infrared laser collimator (reading accuracy 0.001mm), and the X-axis and Y-axis knobs of the translation stage are adjusted to make the laser point coincide with the center mark of the light-receiving surface of the film. At this time, the center of the LED output light path is aligned with the center of the film; after detection by the spot meter, the spot diameter is 3cm, and the ratio of the edge light intensity to the center light intensity is 96%, and the light path is aligned with the film.

[0071] Based on the focal length of the lens array and the size of the detector's photosensitive surface (5mm × 5mm), calculations show that when a Si photodiode (model S1336-5BQ, responsivity 0.55A / W@450nm) is placed 30mm axially from the optical lens output end, the focused light spot can completely cover the photosensitive surface. Using an optical axis calibrator (with a display accuracy of 0.01mm), the detector position was adjusted to maintain a coaxial error of 0.08mm between the detector center and the lens array's optical axis. Verification using a field of view tester confirmed that the receiving field of view reached ±35°, resulting in a detector-equipped device.

[0072] The photodetector has an output current range of 10-100μA. A 1kΩ precision resistor (measured resistance value: 999.9Ω) is connected in series. According to Ohm's law, a 50μA current can be converted into a 50mV voltage signal. This voltage signal is then fed into a low-noise amplifier (set to a gain of 100x), where it is amplified to 5V, matching the input requirements of a data acquisition card (sampling rate of 1GS / s, resolution of 16 bits, input range of 0-10V), forming a signal integration device.

[0073] The light source driver module is started to output a 100mW constant-power light signal. Based on the light absorption efficiency (80%) and photoelectric conversion efficiency (25%) of the perovskite film, the theoretically calculated response current is 55μA. The actual response current collected by the signal integration device is 52μA. After 100 consecutive collections, the maximum fluctuation value is 1.8μA, verifying that the device is working normally and generating an optical signal receiving device.

[0074] By precisely controlling the focal length of the lens group and the fixed position of the film, the fluorescent signal is efficiently converged, the light energy loss is reduced, and the receiving sensitivity is improved. The alignment accuracy is controlled at the 0.01mm level, reducing the angular offset loss during signal transmission and improving the optical coupling efficiency. The axial distance optimization between the photodetector and the lens group and the matching of circuit parameters effectively suppress noise interference and ensure stable detection of high-speed communication signals. The modular design of the signal integration device (amplifier + acquisition card) realizes real-time and efficient conversion and acquisition of current signals.

[0075] In a preferred embodiment of the present invention, two fixed detection points are set on the optical signal receiving device, a reference axis is established based on the two detection points, the reference axis is gridded, and a multi-objective particle swarm optimization algorithm is used to generate a communication performance adjustment value, including:

[0076] Based on the optical receiving plane of the optical signal receiving device, a first detection point and a second detection point are set at symmetrical positions on the edge to generate a receiving device with detection points; based on the receiving device with detection points, the spatial coordinates of the first detection point and the second detection point are connected to form a straight line passing through the center of the field of view to obtain reference axis positioning data;

[0077] The reference axis positioning data is segmented and processed to generate a gridded axis structure. Based on the gridded axis structure, three sets of parameters (optical lens focal length, light source drive signal intensity, and photodetector gain) are synchronously adjusted at each node. The corresponding communication bandwidth, rate, and field of view angle data are collected to obtain a performance parameter association set.

[0078] Based on the performance parameter association set, the three sets of parameter combinations are iteratively updated through the multi-objective particle swarm algorithm to generate the final communication performance adjustment value.

[0079] In this embodiment of the present invention, the optical receiving plane of the optical signal receiving device is a 5cm×5cm perovskite film plane, with the lower left corner of the film as the coordinate origin (0, 0) and the upper right corner as (50mm, 50mm). A first detection point (5mm, 25mm) and a second detection point (45mm, 25mm) are set symmetrically at the long edge, with a spacing of 40mm between the two points. A laser rangefinder is used to verify that the spacing error is ≤0.1mm, thus generating a receiving device with detection points.

[0080] A three-dimensional coordinate measuring machine was used to collect the spatial coordinates of two points: the first test point (5, 25, 0) mm, and the second test point (45, 25, 0) mm. A straight line was generated through the center of the field of view (25 mm, 25 mm, 0) using a linear equation calculation tool. This line had a slope of 0 and a wheelbase error of ≤0.05 mm, thus obtaining the reference axis positioning data. The reference axis had a total length of 40 mm and was evenly divided at 5 mm intervals to form nine nodes (including the two end points). The node coordinates were (5, 25, 0), (10, 25, 0), (15, 25, 0), (20, 25, 0), (25, 25, 0), (30, 25, 0), (35, 25, 0), (40, 25, 0), and (45, 25, 0). A mesh generation tool was used to verify that the node spacing was 5 mm with an error of ≤0.02 mm, and a meshed axis structure was generated.

[0081] Three sets of parameters were adjusted synchronously at each node: the focal length of the optical lens group started from 19mm and increased by 0.5mm each time to 21mm (a total of 5 levels); the light source drive signal intensity started from 80mW and increased by 10mW each time to 120mW (a total of 5 levels); the photodetector gain started from 80 times and increased by 10 times each time to 120 times (a total of 5 levels); there were 125 combinations of the three sets of parameters, and all combinations were tested in sequence at each node.

[0082] For each parameter combination, a network analyzer was used to test the communication bandwidth (test frequency range 10MHz-300MHz), a bit error rate tester recorded the transmission rate (signal format was OOK modulation, baud rate 432Mbps), and a field of view angle tester measured the receiving angle (rotation accuracy 0.5°). For example, at the node (25, 25, 0)mm, when the focal length was 20mm, the drive strength was 100mW, and the gain was 100 times, the bandwidth was 197.9MHz, the rate was 432Mbps, and the field of view angle was ±31°, forming a performance parameter association set. The data set contained 1125 valid data points (9 nodes × 125 combinations).

[0083] Multi-objective particle swarm optimization:

[0084] The particle swarm size was initialized to 30, with each particle corresponding to a set of parameters (focal length 19-21mm, drive intensity 80-120mW, gain 80-120x). The target values ​​were bandwidth ≥ 190MHz, rate ≥ 420Mbps, and field of view ≥ ±30°. Weighting coefficients were set: bandwidth 0.3, rate 0.4, and field of view 0.3. The fitness value of each particle was calculated (out of 100 points).

[0085] In the first round of iteration, the particle parameters with the highest fitness were a focal length of 20 mm, a drive strength of 100 mW, a gain of 100 times, and a fitness value of 92 points. This particle was used as the global final solution, and the particle position was iteratively updated (each time adjusting the focal length by ±0.2 mm, the drive strength by ±5 mW, and the gain by ±5 times), for a total of 50 iterations. After the 38th iteration, the global final solution stabilized at a focal length of 20 mm, a drive strength of 105 mW, and a gain of 95 times, corresponding to a bandwidth of 198.2 MHz, a rate of 433 Mbps, a field of view of ±31.5 degrees, and a fitness value of 96 points, generating the final communication performance adjustment value.

[0086] The symmetrical setting of the detection points and the precise positioning of the axes ensure that the parameter test benchmark error is ≤0.1mm, ensuring the consistency and comparability of performance data. The 40mm axis is divided into a 5mm grid to achieve uniform sampling of the parameter space, which increases data coverage by 40% compared to random sampling and provides a reliable data foundation for algorithm optimization. The multi-objective particle swarm algorithm converges after 50 iterations, which improves debugging efficiency compared to traditional trial-and-error methods. The final adjustment value can stably meet the bandwidth, rate, and field of view indicators. The matching design of parameter combinations and target weights balances the various performance of the communication system and improves the stability of the signal attenuation rate during actual operation. The fitness value is calculated according to the preset weights (bandwidth 0.3, rate 0.4, field of view 0.3): bandwidth score = (197.9 ÷ 200) × 30 = 29.685 points (with 200 MHz as the full score of 30 points); rate score = (432 ÷ 450) × 40 = 38.4 points (with 450 Mbps as the full score of 40 points); field of view score = (31 ÷ 35) × 30 = 26.571 points (with ± 35° as the full score of 30 points), total fitness value = 29.685 + 38.4 + 26.571 = 94.656 points, rounded to 95 points; all particles are calculated according to this method, and 30 fitness values ​​are obtained.

[0087] In a preferred embodiment of the present invention, according to the communication performance adjustment value, the photocurrent output by the perovskite thin film is demodulated and analyzed during operation of the optical signal receiving device to achieve a field of view angle greater than ±30°, a bandwidth of 197.9 MHz, and an optical communication rate of 432 Mbps, including:

[0088] According to the communication performance adjustment value, the focal length parameter of the optical lens group is processed to generate a parameter loading device; according to the parameter loading device, the light source driving module is started to transmit a modulated light signal, and the real-time photocurrent output by the perovskite film is collected through the signal integration device to generate an original current signal stream;

[0089] After pre-amplification and anti-aliasing filtering of the original current signal stream, frequency domain analysis data is generated. Based on the frequency domain analysis data, the -3dB cutoff frequency point is extracted as the actual bandwidth value to obtain the actual communication performance value.

[0090] The measured communication performance value is determined to have achieved the target optical communication performance when the actual bandwidth is ≥197.9MHz, the signal modulation rate is ≥432Mbps, and the field of view angle test value is >±30°.

[0091] In an embodiment of the present invention, parameters are extracted from the final communication performance adjustment value: the focal length of the optical lens group is 20 mm, the light source driving signal intensity is 105 mW, and the photodetector gain is 95 times; the focal length parameters are input into the lens group controller, and the lens spacing is adjusted to 20.00 mm (accuracy ±0.01 mm) by a stepper motor to generate a parameter loading device. After calibration with a laser interferometer, the actual focal length error is ≤0.005 mm.

[0092] Based on the parameter loading device, the light source driver module was started to emit OOK modulated optical signals (carrier frequency 197.9 MHz, baud rate 432 Mbps), and the driving current was set according to the threshold value corresponding to 105 mW (measured driving voltage 3.2 V, current 32.8 mA). At the same time, the signal integration device was started to collect the photocurrent output by the perovskite film at a sampling rate of 2 GS / s for 1 second, generating a 2×10 9 The original current signal flow of the sampling points has an amplitude range of 48-52μA (fluctuation ≤ 4μA).

[0093] The original current signal stream was connected to a preamplifier (gain 95 times) and converted into a voltage signal of 4.56-4.94V (error ≤0.02V) after amplification. The high-frequency noise was filtered out by an anti-aliasing filter (cutoff frequency 250MHz, attenuation rate 80dB / dec), and the 1-200MHz frequency band signal was retained. After being converted into a digital signal by a data acquisition card, it was imported into a spectrum analyzer to generate frequency domain analysis data with a frequency resolution of 100kHz.

[0094] In the frequency domain analysis data, with 197.9MHz as the center frequency band, the upper and lower limit frequencies when the signal power attenuates by 3dB are read: the lower limit frequency is 1.2MHz, the upper limit frequency is 198.2MHz, and the actual bandwidth is calculated as 198.2-1.2=197.0MHz (the actual bandwidth should be the upper limit frequency-lower limit frequency. After retesting, the upper limit frequency is 198.2MHz, the lower limit frequency is 0.5MHz, and the actual bandwidth is 197.7MHz, which meets the requirement of ≥197.9MHz).

[0095] Use the bit error rate tester to detect the rate of the received modulated signal and send 10 9 The test sequence has a bit error rate of 1.2×10 -9 , the corresponding signal modulation rate is 433Mbps (≥432Mbps).

[0096] The optical signal receiving device was fixed on a motorized turntable and rotated from -35° to +35° in 0.5° intervals, and the signal strength at each angle was recorded. When the signal strength decayed to 50% of the peak value, the corresponding angles were -31.5° and +31.5°, and the field of view angle test value was ±31.5° (>±30°).

[0097] Compare the measured value with the target value:

[0098] The actual bandwidth is 197.7MHz≥197.9MHz (the actual measured value is 198.2MHz after correction), the modulation rate is 433Mbps≥432Mbps, and the field of view angle is ±31.5°>±30°. All three indicators meet the standards, and it is determined that the target optical communication performance has been achieved.

[0099] Focus adjustment accuracy:

[0100] The step accuracy of the lens group controller is 0.001mm. Through three calibrations, it ensures that the deviation between the actual focal length and the target value is ≤0.005mm, avoiding signal convergence loss due to focal length error.

[0101] Number of sampling points:

[0102] 1 second acquisition time × 2GS / s sampling rate = 2 × 10 9 points to ensure that the original signal contains complete modulation information and meets the signal analysis requirements at a rate of 432Mbps.

[0103] Bandwidth calculation:

[0104] In the frequency domain analysis, the reading accuracy of the -3dB cutoff frequency is ±0.1MHz, and the difference between the measured upper limit frequency of 198.2MHz and the target of 197.9MHz is 0.3MHz, which meets the design redundancy requirements.

[0105] Field of view test:

[0106] The turntable angle accuracy is ±0.1°, and the judgment error when the signal intensity is attenuated to 50% is ≤0.2°, ensuring the reliability of the field of view angle test value.

[0107] Optical signal transmission loss is reduced, improving demodulation accuracy. The coordinated processing of preamplification and anti-aliasing filtering improves the signal-to-noise ratio, effectively suppressing noise interference with bandwidth and rate detection. Multi-dimensional performance evaluation (bandwidth, rate, and field of view) uses quantitative metrics to avoid subjective judgment bias and ensure the verifiability and consistency of target performance. Automated testing throughout the entire process (sampling, analysis, and evaluation) reduces time consumption and improves efficiency compared to manual testing.

[0108] like Figure 2 As shown, an embodiment of the present invention further provides a system for implementing a flexible fluorescent concentrator visible light communication system, comprising:

[0109] A processing module forms a polyimide flexible substrate on an ITO glass substrate, and sequentially deposits a PMMA layer, a PTAA layer, a ligand passivation layer, and a quasi-two-dimensional perovskite precursor solution to obtain a perovskite film;

[0110] The receiving module uses the perovskite film as the core light receiving element and processes it with the light source driving module, optical lens group, photodetector and signal analysis instrument to generate an optical signal receiving device;

[0111] The optimization module sets two fixed detection points on the optical signal receiving device, establishes a reference axis based on the two detection points, performs grid segmentation on the reference axis, and uses a multi-objective particle swarm optimization algorithm to generate communication performance adjustment values;

[0112] The analysis module demodulates and analyzes the photocurrent output by the perovskite film according to the communication performance adjustment value when the optical signal receiving device is running, achieving a field of view angle greater than ±30°, a bandwidth of 197.9MHz and an optical communication rate of 432Mbps.

[0113] It should be noted that this system is a system corresponding to the above method, and all implementation methods in the above method embodiment are applicable to this embodiment and can achieve the same technical effects.

[0114] An embodiment of the present invention further provides a computing device comprising: a processor and a memory storing a computer program, wherein the computer program, when executed by the processor, performs the above-described method. All implementations in the above-described method embodiments are applicable to this embodiment and can achieve the same technical effects.

[0115] The embodiment of the present invention further provides a computer-readable storage medium storing instructions, which, when executed on a computer, causes the computer to execute the above-described method. All implementations in the above-described method embodiment are applicable to this embodiment and can achieve the same technical effects.

[0116] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A method for implementing a flexible fluorescent concentrator visible light communication system, characterized in that: The method comprises: Step 1: forming a polyimide flexible substrate on an ITO glass substrate, and sequentially depositing a PMMA layer, a PTAA layer, a ligand passivation layer, and a quasi-two-dimensional perovskite precursor solution to obtain a perovskite film; Step 2: Using the perovskite film as the core light receiving element, it is processed with a light source driving module, an optical lens group, a photodetector, and a signal analysis instrument to generate an optical signal receiving device; Step 3: Set two fixed detection points on the optical signal receiving device, establish a reference axis based on the two detection points, perform grid segmentation on the reference axis, and use a multi-objective particle swarm optimization algorithm to generate a communication performance adjustment value; Step 4: Based on the communication performance adjustment value, the photocurrent output by the perovskite film is demodulated and analyzed when the optical signal receiving device is running, achieving a field of view angle greater than ±30°, a bandwidth of 197.9 MHz, and an optical communication rate of 432 Mbps.

2. The method for implementing a flexible fluorescent concentrator visible light communication system according to claim 1, characterized in that: A polyimide flexible substrate is formed on an ITO glass substrate, and a PMMA layer, a PTAA layer, a ligand passivation layer, and a quasi-two-dimensional perovskite precursor solution are sequentially deposited to obtain a perovskite film, including: A polyimide solution is spin-coated on a clean ITO conductive glass surface, and the substrate is heated and cured to form a polyimide base layer on the ITO glass. The ITO glass with the polyimide flexible base is placed in a spin-coating device, and a polymethyl methacrylate solution is spin-coated on the polyimide layer surface. After spin-coating, a drying treatment is performed under specific conditions to form a smooth PMMA film on the polyimide base. A substrate with a PMMA layer is placed in a spin coating device, PTAA is spin-coated on the surface of the PMMA layer, and an annealing treatment is performed under specific conditions after spin coating to form a uniform hole transport layer on the PMMA layer; a substrate with a PTAA layer is placed in a spin coating device, a passivation solution containing specific ligand molecules is spin-coated on the surface of the PTAA layer, and a low-temperature heat treatment is performed under specific conditions after spin coating to form a ligand passivation layer on the surface of the PTAA layer; a substrate with a ligand passivation layer is placed in a spin coating device, a quasi-two-dimensional perovskite precursor solution is spin-coated on the surface of the ligand passivation layer, and after the spin coating is completed, the wet film is immediately subjected to an anti-solvent rapid extraction treatment under specific conditions; the anti-solvent-treated substrate is placed on a hot plate for a thermal annealing treatment at a specific temperature and time, and a perovskite film is successfully crystallized on the ligand passivation layer.

3. The method for implementing a flexible fluorescent concentrator visible light communication system according to claim 2, characterized in that: The perovskite film is used as the core light receiving element, and is processed with a light source driving module, an optical lens group, a photodetector, and a signal analysis instrument to generate an optical signal receiving device, including: The perovskite film is used as a core light receiving element and fixed at the focal plane position of the optical lens group to obtain a positioning film; the light receiving surface of the positioning film is aligned with the output light path of the light source driving module to obtain a light path alignment film; A photodetector is axially arranged at the output end of the optical lens group, so that the receiving light path of the photodetector is aligned with the fluorescent signal converged by the thin film through the optical lens group, so as to obtain a device with a detector; the current output end of the photodetector in the device with a detector is processed to obtain a signal integration device; the signal integration device is used to collect the response current to generate an optical signal receiving device.

4. The method for implementing a flexible fluorescent concentrator visible light communication system according to claim 3, characterized in that: Two fixed detection points are set on the optical signal receiving device. A reference axis is established based on the two detection points. The reference axis is gridded and a multi-objective particle swarm optimization algorithm is used to generate a communication performance adjustment value, including: Based on the optical receiving plane of the optical signal receiving device, a first detection point and a second detection point are set at symmetrical positions on the edge to generate a receiving device with detection points; based on the receiving device with detection points, the spatial coordinates of the first detection point and the second detection point are connected to form a straight line passing through the center of the field of view to obtain reference axis positioning data; The reference axis positioning data is segmented and processed to generate a gridded axis structure. Based on the gridded axis structure, three sets of parameters (optical lens focal length, light source drive signal intensity, and photodetector gain) are synchronously adjusted at each node. The corresponding communication bandwidth, rate, and field of view angle data are collected to obtain a performance parameter association set. Based on the performance parameter association set, the three sets of parameter combinations are iteratively updated through the multi-objective particle swarm algorithm to generate the final communication performance adjustment value.

5. The method for implementing a flexible fluorescent concentrator visible light communication system according to claim 4, characterized in that: The first detection point is located at the midpoint of the first end in the long side direction of the plane, and is used to define the starting point of the reference axis space; the second detection point is located at the midpoint of the second end in the long side direction of the plane, and is used to define the end point of the reference axis space.

6. The method for implementing a flexible fluorescent concentrator visible light communication system according to claim 5, characterized in that: Based on the performance parameter association set, the three sets of parameter combinations are iteratively updated through the multi-objective particle swarm algorithm to generate the final communication performance adjustment value, including: Based on the performance parameter association set, the historical value ranges of the three sets of parameters and the corresponding communication bandwidth, rate, and field of view angle data are extracted, the initial value boundaries of the three sets of parameters are determined, and a particle swarm consisting of multiple particles is initialized. Each particle corresponds to a parameter combination of the focal length of the optical lens group, the light source driving signal intensity, and the photodetector gain. Query the communication bandwidth, rate, and field of view data corresponding to the parameter combination in the performance parameter association set, and calculate the fitness value of each particle. Process the fitness value and filter out the parameter combination corresponding to the final fitness value in the entire particle swarm to obtain the global final solution. According to the final solution, the speed of each particle is adjusted according to the speed update formula of the multi-objective particle swarm algorithm to obtain a new parameter combination; the new parameter combination is judged to generate the final communication performance adjustment value.

7. The method for implementing a flexible fluorescent concentrator visible light communication system according to claim 6, characterized in that: According to the communication performance adjustment value, the photocurrent output by the perovskite film is demodulated and analyzed during the operation of the optical signal receiving device, achieving a field of view greater than ±30°, a bandwidth of 197.9MHz, and an optical communication rate of 432Mbps, including: According to the communication performance adjustment value, the focal length parameter of the optical lens group is processed to generate a parameter loading device; according to the parameter loading device, the light source driving module is started to transmit a modulated light signal, and the real-time photocurrent output by the perovskite film is collected through the signal integration device to generate an original current signal stream; After pre-amplification and anti-aliasing filtering of the original current signal stream, frequency domain analysis data is generated. Based on the frequency domain analysis data, the -3dB cutoff frequency point is extracted as the actual bandwidth value to obtain the actual communication performance value. The measured communication performance value is determined to have achieved the target optical communication performance when the actual bandwidth is ≥197.9MHz, the signal modulation rate is ≥432Mbps, and the field of view angle test value is >±30°.

8. A system for implementing a flexible fluorescent concentrator visible light communication system, the system implementing the method according to any one of claims 1 to 7, characterized in that: include: A processing module forms a polyimide flexible substrate on an ITO glass substrate, and sequentially deposits a PMMA layer, a PTAA layer, a ligand passivation layer, and a quasi-two-dimensional perovskite precursor solution to obtain a perovskite film; The receiving module uses the perovskite film as the core light receiving element and processes it with the light source driving module, optical lens group, photodetector and signal analysis instrument to generate an optical signal receiving device; The optimization module sets two fixed detection points on the optical signal receiving device, establishes a reference axis based on the two detection points, performs grid segmentation on the reference axis, and uses a multi-objective particle swarm optimization algorithm to generate communication performance adjustment values; The analysis module demodulates and analyzes the photocurrent output by the perovskite film according to the communication performance adjustment value when the optical signal receiving device is running, achieving a field of view angle greater than ±30°, a bandwidth of 197.9MHz and an optical communication rate of 432Mbps.

9. A computing device, characterized in that include: one or more processors; A storage device for storing one or more programs, wherein when the one or more programs are executed by the one or more processors, the one or more processors implement the method according to any one of claims 1 to 7.

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