Design method of prefabricated optical fiber ferrule for secondary wiring

Abstract

The invention discloses a prefabricated optical fiber ferrule design method for secondary wiring, and relates to the field of power transmission and transformation project design, the prefabricated optical fiber ferrule design method comprises the following steps: identifying loss influence factors of an optical fiber connector, and calculating optical fiber dislocation loss and optical fiber inclined connection loss based on the loss influence factors; respectively designing an optical ferrule body and a PIN guide pin of the optical fiber connector based on the optical fiber loss calculation result to obtain an optical fiber ferrule design scheme; and predicting the performance of the optical fiber connector in an environment scene and a mechanical scene by combining the optical fiber ferrule design scheme, and optimizing the optical fiber ferrule design scheme based on the performance. According to the invention, the insertion core with the PIN guide pin and the guide hole is designed, and the insertion core end face and insertion core fiber core inclination angle grinding and alignment precision compensation modes are adopted to reduce the loss during insertion and butt joint of the optical fibers, so that the transmission loss of optical signals is reduced to the greatest extent, and the reliability and performance of a communication system are improved.

Description

Technical Field

[0001] The invention relates to the field of power transmission and transformation engineering design, and in particular to a method for designing a prefabricated optical fiber insert for secondary wiring. Background Art

[0002] A fiber optic connector is a device used to connect fiber optic cables to achieve precise transmission of optical signals. It makes the connection and disconnection of optical fibers more convenient while maintaining high efficiency and low loss in signal transmission. Fiber optic connectors are designed to minimize light loss during insertion, which is an important indicator for evaluating connector performance. High-quality connectors can ensure low loss and high performance after multiple plugging and unplugging operations.

[0003] Prefabricated fiber optic connectors are important in optical communication systems. They are designed to meet the growing demand for connection density, improve connector performance, reduce physical space occupancy, and optimize the maintainability and reliability of fiber optic networks. With the continuous expansion of data centers and communication networks, the demand for high-density layout of connectors continues to increase. The design of prefabricated fiber optic connector ferrules is committed to optimizing optical performance, including reducing insertion loss and improving return loss. By precisely controlling the manufacturing process of optical components, using high-quality materials and performing precise optical simulation, we can ensure that the connector can still maintain excellent optical performance under high-density layout, meet the requirements of long-term use and frequent connections, and delay the aging of optical components.

[0004] Currently, no effective solution has been proposed for the problems in the related technologies. Summary of the invention

[0005] In view of the problems in the related art, the present invention proposes a design method for a prefabricated optical fiber ferrule for secondary wiring to overcome the above technical problems existing in the existing related art.

[0006] To this end, the specific technical solution adopted by the present invention is as follows:

[0007] A method for designing a prefabricated optical fiber ferrule for secondary wiring, the method comprising:

[0008] S1. Identify the factors affecting the loss of optical fiber connectors, and calculate the optical fiber misalignment loss and the optical fiber tilt connection loss based on the loss factors;

[0009] S2. Based on the calculation results of the optical fiber loss, the optical ferrule body and the PIN guide pin of the optical fiber connector are designed respectively to obtain the optical fiber ferrule design scheme;

[0010] S3. Combine the fiber optic ferrule design scheme to predict the performance of the fiber optic connector in environmental and mechanical scenarios, and optimize the fiber optic ferrule design scheme based on the performance.

[0011] Preferably, factors affecting the loss of the optical fiber connector include the quality of the optical fiber end face, the docking accuracy of the optical fiber connector, the optical fiber type, usage and environmental factors; the optical fiber type includes single-mode optical fiber and multi-mode optical fiber.

[0012] Preferably, calculating the optical fiber misalignment loss and the optical fiber tilt connection loss based on the loss influencing factors includes:

[0013] Calculate the misalignment loss of single-mode optical fiber and multi-mode optical fiber respectively, and control the horizontal and vertical misalignment state of the optical fiber based on the misalignment loss calculation results to compensate for the docking accuracy of the optical fiber connector;

[0014] The fiber core tilt connection loss of the single-mode fiber and the multi-mode fiber is calculated respectively, and the fiber tilt angle is controlled within a preset range based on the fiber core tilt connection loss.

[0015] Preferably, the calculation formula for the misalignment loss of a single-mode optical fiber is:

[0016]

[0017] The calculation formula for the misalignment loss of multimode optical fiber is:

[0018]

[0019] Where, L d Represents the misalignment loss of single-mode optical fiber; L n Represents the misalignment loss of multimode optical fiber; K d represents the optical fiber misalignment loss coefficient; d represents the radial or lateral misalignment distance between two optical fibers; a represents the optical fiber mode field radius.

[0020] Preferably, the optical fiber ferrule design includes a ferrule end face angle polishing design, an optical fiber core tilt angle grinding design and an alignment offset error compensation design.

[0021] Preferably, the ferrule end face angle polishing design includes:

[0022] Calculate the return loss of the optical fiber ferrule, and polish the optical fiber ferrule at a preset tilt angle based on the calculation result of the return loss to reduce Fresnel reflection in the optical fiber ferrule connection;

[0023] The refractive index of the external medium is kept consistent with that of the optical fiber ferrule, and the end face angle of the optical fiber ferrule is controlled within a preset range.

[0024] Preferably, the refractive index of the external medium is kept consistent with that of the optical fiber ferrule, and the refractive index of the external medium is 1.445-1.465; the end face angle of the optical fiber ferrule is controlled within a preset range, and the preset range is 7.0°-8.0°.

[0025] Preferably, the return loss of the optical fiber ferrule is calculated as follows:

[0026] RL = -10 × log 10 (R);

[0027]

[0028] Where RL represents the return loss of the optical fiber ferrule; R in represents the Fresnel reflection coefficient under vertical incidence; R represents the Fresnel reflection coefficient; n2 represents the refractive index of the medium outside the optical fiber; λ represents the wavelength of the optical fiber; e represents the base of the natural logarithm; Represents the mode field diameter of the optical fiber.

[0029] The present invention reduces the loss during optical fiber insertion and docking by designing a ferrule with a PIN guide pin and a guide hole, and adopts a ferrule end face and ferrule core inclination grinding and alignment accuracy compensation method, thereby minimizing the transmission loss of optical signals and improving the reliability and performance of the communication system. At the same time, this design can also reduce errors during installation and maintenance, reduce the maintenance cost of the optical fiber connector, and provide a guarantee for the long-term stable operation of the optical communication and data transmission system.

[0030] Preferably, predicting the performance of the optical fiber connector in an environmental scenario in combination with the optical fiber ferrule design scheme, and optimizing the optical fiber ferrule design scheme based on the performance includes:

[0031] Based on the fiber ferrule design scheme and using finite element analysis technology to simulate the behavior response characteristics of fiber optic connectors under different environmental conditions;

[0032] Obtain historical performance data of optical fiber connectors to establish a performance prediction model, and use behavioral response characteristics as input to predict the performance of optical fiber connectors under different environmental conditions through the performance prediction model;

[0033] Analyze the performance of fiber optic connectors to determine the design parameters that have the greatest impact on performance, and optimize the fiber optic ferrule design based on the analysis results.

[0034] Preferably, the behavior response characteristics of the optical fiber connector under different environmental conditions are simulated based on the optical fiber ferrule design scheme and using finite element analysis technology, including:

[0035] Extract the fiber ferrule design and use finite element analysis technology to establish a three-dimensional geometric model of the fiber optic connector, and set material properties for each component in the three-dimensional geometric model;

[0036] Mesh the 3D geometry and apply boundary conditions including fixed support points, load types and load areas;

[0037] Use preconfigured solvers to solve the behavior of 3D geometric models under different boundary conditions and adjust the solver configuration to ensure convergence of the solution process;

[0038] The response results of the three-dimensional geometric model under different boundary environment conditions are obtained, and the response results are fused to obtain the behavioral response characteristics of the optical fiber connector.

[0039] The beneficial effects of the present invention are as follows: the present invention reduces the loss during optical fiber insertion and docking by designing a ferrule with a PIN guide pin and a guide hole, and adopts a ferrule end face and ferrule core inclination grinding and alignment accuracy compensation method, thereby minimizing the transmission loss of optical signals and improving the reliability and performance of the communication system. At the same time, this design can also reduce errors during installation and maintenance, reduce the maintenance cost of optical fiber connectors, and provide guarantee for the long-term stable operation of optical communication and data transmission systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 is a flow chart of a method for designing a prefabricated optical fiber ferrule for secondary wiring according to an embodiment of the present invention;

[0042] Figure 2 It is a schematic diagram of lateral misalignment of optical fiber connection in a method for designing a prefabricated optical fiber ferrule for secondary wiring according to an embodiment of the present invention;

[0043] Figure 3 It is a schematic diagram of radial misalignment of optical fiber connection in a method for designing a prefabricated optical fiber ferrule for secondary wiring according to an embodiment of the present invention;

[0044] Figure 4 It is a schematic diagram of a single-mode end-face-connected MT ferrule body in a method for designing a prefabricated optical fiber ferrule for secondary wiring according to an embodiment of the present invention;

[0045] Figure 5 It is a schematic diagram of a multi-mode end-face-connected MT ferrule body in a method for designing a prefabricated optical fiber ferrule for secondary wiring according to an embodiment of the present invention;

[0046] Figure 6 This is one of the schematic diagrams of a ferrule body with a PIN guide pin and a guide hole in a method for designing a prefabricated optical fiber ferrule for secondary wiring according to an embodiment of the present invention;

[0047] Figure 7 This is a second schematic diagram of a ferrule body with a PIN guide pin and a guide hole in a method for designing a prefabricated optical fiber ferrule for secondary wiring according to an embodiment of the present invention;

[0048] Figure 8 The present invention is a schematic diagram of a design structure of a MT ferrule PIN guide pin in a method for designing a prefabricated optical fiber ferrule for secondary wiring according to an embodiment of the present invention. DETAILED DESCRIPTION

[0049] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments. They can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in this field should be able to understand other possible implementation methods and advantages of the present invention.

[0050] According to an embodiment of the present invention, a method for designing a prefabricated optical fiber ferrule for secondary wiring is provided.

[0051] The present invention is further described with reference to the accompanying drawings and specific embodiments. Figure 1 As shown, according to the prefabricated optical fiber ferrule design method for secondary wiring according to an embodiment of the present invention, the prefabricated optical fiber ferrule design method includes:

[0052] S1. Identify the factors affecting the loss of optical fiber connectors, and calculate the optical fiber misalignment loss and optical fiber tilt connection loss based on the loss factors.

[0053] Among them, the factors affecting the loss of optical fiber connectors include the quality of the optical fiber end face, the docking accuracy of the optical fiber connector, the optical fiber type, usage and environmental factors; the optical fiber type includes single-mode optical fiber and multi-mode optical fiber.

[0054] Among them, the calculation of optical fiber misalignment loss and optical fiber tilt connection loss based on loss influencing factors includes:

[0055] Calculate the misalignment loss of single-mode optical fiber and multi-mode optical fiber respectively, and control the horizontal and vertical misalignment state of the optical fiber based on the misalignment loss calculation results to compensate for the docking accuracy of the optical fiber connector;

[0056] The fiber core tilt connection loss of the single-mode fiber and the multi-mode fiber is calculated respectively, and the fiber tilt angle is controlled within a preset range based on the fiber core tilt connection loss.

[0057] Among them, in optical fiber connectors, single-mode fiber SMF (Single Mode Fiber) and multi-mode fiber MMF (Multi-Mode Fiber) are two main types of optical fibers. Their main differences are core diameter size, number of modes, transmission distance and data transmission rate. The core diameter of single-mode optical fiber is usually between 8.3μm and 10μm. Due to the small core diameter, only one mode, that is, one light propagation path, is allowed to pass. The core diameter of multi-mode optical fiber is usually between 50μm and 62.5μm. Due to the large core diameter, multiple modes are allowed to pass. Optical fiber connectors are widely used in power and communication engineering, and their connection insertion must meet the transmission performance requirements, as shown in Table 1.

[0058] Table 1: Multimode / single-mode fiber optic connector transmission performance

[0059] Project Name Performance requirements Insertion loss 4 / 8 core: ≤0.6dB; 12 / 24 core: ≤0.8dB

[0060] It should be noted that the factors that affect the loss of optical fiber connectors mainly include the quality of the optical fiber end face, the docking accuracy of the connector, the type of optical fiber, the use of the connector, environmental factors, etc., while the optical fiber section quality and connector docking accuracy can be improved through manufacturing processes. The optical fiber end face quality factor refers to the fact that when the optical fiber end face quality is poor, such as contamination, scratches, unevenness, it will increase the insertion loss. The docking accuracy of the connector includes the verticality of the end face and the alignment of the optical fiber core.

[0061] If the docking accuracy is poor, it will lead to increased light transmission loss, and the misaligned docking loss is the loss caused by the reduced docking accuracy caused by the axial or radial misalignment of the two optical fiber ends. Figure 2 Shown is the lateral misalignment of the fiber core. Figure 3 is the radial misalignment of the fiber core. The calculation formula for the misalignment loss of a single-mode optical fiber is:

[0062]

[0063] The calculation formula for the misalignment loss of multimode optical fiber is:

[0064]

[0065] Where, L d Represents the misalignment loss of single-mode optical fiber; L n Represents the misalignment loss of multimode optical fiber; K d represents the optical fiber misalignment loss coefficient; d represents the radial or lateral misalignment distance between two optical fibers; a represents the optical fiber mode field radius.

[0066] It should be noted that when designing prefabricated optical fiber connectors, the angle of the optical fiber connection end face will also lead to a decrease in the transmission efficiency of the optical signal at the non-ideal position on the connector contact surface, causing an increase in insertion loss. The loss caused by this optical fiber tilt is due to the fact that during the insertion of the optical fiber connector, the tilt angle of the optical fiber end face causes the optical signal to deviate from the transmission path on the connector contact surface, which produces reflection and scattering, thereby increasing the insertion loss. The tilt angle will also reduce the mode coupling efficiency of the optical fiber, and some optical signals cannot be effectively transmitted to the receiving end. Among them, the calculation formula for the tilt connection loss of the single-mode and multi-mode prefabricated optical fiber core is:

[0067]

[0068] Where, L q Indicates the core tilt connection loss of single-mode prefabricated optical fiber; L m represents the core tilt connection loss of multimode prefabricated optical fiber; α represents the core tilt angle on the end faces of the female plug and the male plug when the prefabricated optical fiber plug connector is connected; K α represents the loss coefficient of the tilt angle; Δ represents the refractive index coefficient of the optical fiber.

[0069] It should be noted that from the calculation formula of the tilted connection loss of single-mode and multi-mode prefabricated optical fiber cores, it can be seen that the loss is proportional to the square of the tilt angle. When the tilt angle α of the optical fiber end face is larger, its α 2 The larger / Δ is, the more loss will be caused, and the core tilt loss of single-mode fiber is much more affected by the tilt angle than that of multi-mode fiber. Therefore, in the design of optical fiber connectors, controlling the fiber tilt angle within a reasonable range is the key to ensuring low-loss connection.

[0070] S2. Based on the calculation results of the optical fiber loss, the optical ferrule body and PIN guide pin of the optical fiber connector are designed respectively to obtain the optical fiber ferrule design scheme.

[0071] It should be noted that the insertion loss of the end-face crimped ferrule body after being installed in the connector is small, the number of cores that can be plugged in is large, and the subsequent operation and maintenance is also convenient. The designed ferrule body consists of a male plug with a prefabricated PIN guide pin, a female plug with a guide hole on the end face, and an adapter for connecting the plug on the outside. In the plug, the optical fiber is fixed in the optical fiber hole of the MT (Mechanically Transferable) sleeve. When one plug is connected to another plug, the precise positioning between the two plugs can be achieved by aligning the PIN guide pin and the guide hole with the corresponding MT sleeve. The arranged optical fibers are aligned with the two guide holes with sub-micron accuracy, and each optical fiber protrudes from the end face of the MT sleeve with a length of less than 6 microns.

[0072] Among them, the fiber optic ferrule design scheme includes the ferrule end face angle polishing design scheme, the fiber optic core inclination angle grinding design scheme and the alignment offset error compensation design scheme.

[0073] Among them, the ferrule end face angle polishing design scheme includes:

[0074] The return loss of the optical fiber ferrule is calculated, and based on the calculation result of the return loss, the optical fiber ferrule is polished at a preset tilt angle to reduce Fresnel reflection in the optical fiber ferrule connection.

[0075] Among them, in order to reduce the Fresnel reflection in the vertically polished end of the optical fiber ferrule connection, the ferrule body needs to be polished at a certain tilt angle and the end face needs to be polished with a precision grinder. For single-mode optical fiber ferrules, the return loss is required to be greater than 40dB. The calculation formula for the return loss of the optical fiber ferrule is:

[0076] RL = -10 × log 10 (R);

[0077]

[0078] Where RL represents the return loss of the optical fiber ferrule; R in represents the Fresnel reflection coefficient under vertical incidence; R represents the Fresnel reflection coefficient; n2 represents the refractive index of the medium outside the optical fiber; λ represents the wavelength of the optical fiber; e represents the base of the natural logarithm, which is approximately equal to 2.71828; Represents the mode field diameter of the optical fiber.

[0079] The refractive index of the external medium is kept consistent with that of the optical fiber ferrule, and the end face angle of the optical fiber ferrule is controlled within a preset range.

[0080] The refractive index of the external medium is kept consistent with that of the optical fiber ferrule, wherein the refractive index of the external medium is 1.445-1.465, and the single-mode optical fiber is more suitable for using a light wavelength of 1310nm, and the end face angle of the optical fiber ferrule is controlled within a preset range, wherein the preset range is 7.0°-8.0°.

[0081] It should be noted that the optical fiber core tilt grinding design includes:

[0082] In the calculation of the connection loss caused by the core tilt angle of single-mode and multi-mode prefabricated optical fibers, the maximum core tilt angle is controlled to be no more than 0.4°, which can ensure that the connection loss does not exceed 0.1dB.

[0083] It should be noted that the alignment offset error compensation design includes:

[0084] Since the gap-based MT connection structure is more complex than conventional fiber optic connectors, when the MT sleeve is in place, the core position in the short sleeve axis direction will be offset. In addition to the offset caused by the mating force, the gap between the PIN guide pin and the guide hole will also cause this offset, and this misalignment will also lead to an increase in connection loss, as shown in the calculation formula for the misalignment loss of single-mode optical fiber and multi-mode optical fiber. Therefore, the present invention designs a ferrule that can compensate for the offset, by considering the offset error that occurs in the guidance of the mating ferrule, and compensating for the error in the short sleeve axis direction in the design of the guide hole diameter, the guide hole spacing, the PIN guide pin diameter and other dimensions.

[0085] Specifically, taking the design of a multimode 12-core ferrule as an example, the insertion loss does not exceed 0.8dB, the typical fiber mode field radius is selected as 31.25μm, and the core misalignment is calculated to be less than 8.2583μm according to the misalignment loss formula of the multimode fiber. The core misalignment is often caused by the guide mechanism of the plug, and the lateral offset accounts for the main part. By combining the eccentricity of each fiber of each plug, the lateral offset between each paired fiber pair can be obtained, where the calculation formula for the lateral offset between the i-th pair of mating fiber pairs is:

[0086]

[0087] In the formula, x Δi is the short casing direction offset, y Δi The direction of the long casing is offset.

[0088] An alignment offset error compensation is designed to be added in the axial direction, so that the offset calculation in the axial direction is composed of three parts: plug guide mechanism offset, optical fiber eccentricity vector offset and alignment error compensation.

[0089] Therefore, two types of ferrules are designed, namely single-mode and multi-mode optical fiber ferrules. The specific design dimensions and structures are shown in Figure 4-Figure 5 As shown, the structure of the plug body with PIN guide pins and guide holes is shown in FIG. Figure 6-7 As shown (where A represents a guide hole and B represents a PIN guide needle), in addition, Figure 8 The specific design parameters and structure of the MT ferrule PIN guide pin are further displayed in detail.

[0090] Figure 4-Figure 5 The diameters and tolerance values ​​of the PIN guide pins and PIN guide pin holes of the ferrule body and the inner diameter and tolerance values ​​of the optical fiber hole are indicated in the figure. Taking a single-row 12-core array as an example, the dimensions with tolerance values ​​required for precision manufacturing are designed, and the design parameters of the PIN guide pins of the ferrule are shown in Table 2.

[0091] Table 2: MT ferrule PIN guide pin parameters

[0092] mark Minimum value (mm) Maximum value (mm) A 0.6985 0.6990 C 4.5995 4.6005 D 6.3 6.5 U 2.4 2.5 BA 0.2 0.4 BB 0.2 0.5 BC 6.0 6.5

[0093] S3. Combine the fiber optic ferrule design scheme to predict the performance of the fiber optic connector in environmental and mechanical scenarios, and optimize the fiber optic ferrule design scheme based on the performance.

[0094] Among them, the performance of the optical fiber connector in the environmental scenario is predicted in combination with the optical fiber ferrule design scheme, and the optical fiber ferrule design scheme is optimized based on the performance, including:

[0095] Based on the fiber optic ferrule design scheme, the finite element analysis technology is used to simulate the behavioral response characteristics of the fiber optic connector under different environmental conditions.

[0096] Among them, the behavior response characteristics of optical fiber connectors under different environmental conditions are simulated based on the optical fiber ferrule design scheme and using finite element analysis technology, including:

[0097] The fiber optic ferrule design scheme is extracted and the finite element analysis technology is used to establish the three-dimensional geometric model of the fiber optic connector, and the material properties are set for each component in the three-dimensional geometric model; the three-dimensional geometric model is meshed and boundary environmental conditions including fixed support points, load types and load areas are applied; the behavioral response of the three-dimensional geometric model under different boundary conditions is solved by the preconfigured solver, and the solver configuration is adjusted to ensure the convergence of the solution process; the response results of the three-dimensional geometric model under different boundary environmental conditions are obtained, and the response results are fused to obtain the behavioral response characteristics of the fiber optic connector.

[0098] Obtain historical performance data of optical fiber connectors to establish a performance prediction model, and use behavioral response characteristics as input to predict the performance of optical fiber connectors under different environmental conditions through the performance prediction model;

[0099] Analyze the performance of fiber optic connectors to determine the design parameters that have the greatest impact on performance, and optimize the fiber optic ferrule design based on the analysis results.

[0100] It should be noted that the performance of prefabricated optical fiber connectors is particularly important in different environments such as long-term actual engineering applications, long-distance transportation, or accidental drops and impacts. In order to evaluate the performance of connectors in different environments, mechanical properties and environmental tests were conducted, as shown in Table 3. The test environment conditions were in an indoor environment with a temperature of (19-26)°C and a relative humidity of (30-35)%. The main instrument used in the test was an optical jumper test system (MAP-230B model). The temperature test conditions were mainly achieved by (GTH-408-60-CP) constant temperature test chamber, (GTH-150-60-CP-SD) constant temperature and humidity test machine, (MHU-225SR) constant temperature and humidity test chamber, and constant temperature and humidity chamber (ETH-408-40-CP-SD). For impact and vibration tests, (CP-100) impact and collision test bench and electric vibration test system (D-600-5 / super) were used.

[0101] Table 3: Effect of light source test wavelength on loss in prefabricated optical fiber connector mechanics and environment

[0102]

[0103] Specifically, it can be seen from the mechanical properties and environmental test results in Table 3 that in the mechanical properties test, the results of the mechanical repeatability durability test show that during multiple plugging and unplugging, the performance of the connector (850nm prefabricated optical fiber connector) can remain stable, and the insertion loss does not increase significantly. In the test, the end face coating material shows good adhesion and wear resistance under multiple plugging and unplugging and mechanical vibration conditions, which can ensure that the optical fiber end face remains smooth and intact during long-term use, further reducing the fluctuation of insertion loss; the vibration test simulates the vibration environment of the connector during transportation and actual use, and the results are between 0.05 and 0.17dB. Although there is a certain degree of change, the overall loss increase is within an acceptable range; and the impact test results show that compared with other mechanical properties tests, impact and collision will cause a larger loss change to the connector, but the maximum increase in the connector loss is also within a controllable range. In temperature and humidity related tests, the connector maintains good performance, and its change value is smaller than that of the mechanical properties test.

[0104] In summary, with the aid of the above-mentioned technical scheme of the present invention, the present invention realizes the reduction of loss during optical fiber insertion and docking by designing a ferrule with PIN guide pins and guide holes, and by adopting the ferrule end face and ferrule core inclination grinding and alignment accuracy compensation, thereby minimizing the transmission loss of optical signals and improving the reliability and performance of the communication system. At the same time, this design can also reduce errors during installation and maintenance, reduce the maintenance cost of optical fiber connectors, and provide guarantee for the long-term stable operation of optical communication and data transmission systems.

[0105] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for designing a prefabricated optical fiber ferrule for secondary wiring, characterized in that: The prefabricated optical fiber ferrule design method includes: S1. Identify the factors affecting the loss of optical fiber connectors, and calculate the optical fiber misalignment loss and the optical fiber tilt connection loss based on the loss factors; S2. Based on the calculation results of the optical fiber loss, the optical ferrule body and the guide pin of the optical fiber connector are designed respectively to obtain the optical fiber ferrule design scheme; S3. Combine the fiber optic ferrule design scheme to predict the performance of the fiber optic connector in environmental and mechanical scenarios, and optimize the fiber optic ferrule design scheme based on the performance.

2. A method for designing a prefabricated optical fiber ferrule for secondary wiring according to claim 1, characterized in that: The factors affecting the loss of the optical fiber connector include the quality of the optical fiber end face, the docking accuracy of the optical fiber connector, the optical fiber type, the usage and the environmental factors; The optical fiber types include single-mode optical fiber and multi-mode optical fiber.

3. A method for designing a prefabricated optical fiber ferrule for secondary wiring according to claim 2, characterized in that: The calculation of optical fiber misalignment loss and optical fiber tilt connection loss based on loss influencing factors includes: Calculate the misalignment loss of single-mode optical fiber and multi-mode optical fiber respectively, and control the horizontal and vertical misalignment state of the optical fiber based on the misalignment loss calculation results to compensate for the docking accuracy of the optical fiber connector; The fiber core tilt connection loss of the single-mode fiber and the multi-mode fiber is calculated respectively, and the fiber tilt angle is controlled within a preset range based on the fiber core tilt connection loss.

4. A method for designing a prefabricated optical fiber ferrule for secondary wiring according to claim 3, characterized in that: The calculation formula of the misalignment loss of the single-mode optical fiber is: The calculation formula of the misalignment loss of the multimode optical fiber is: Where, L d Represents the misalignment loss of single-mode optical fiber; L n Represents the misalignment loss of multimode optical fiber; K d represents the optical fiber misalignment loss coefficient; d represents the radial or lateral misalignment distance between two optical fibers; a represents the optical fiber mode field radius.

5. A method for designing a prefabricated optical fiber ferrule for secondary wiring according to claim 4, characterized in that: The optical fiber ferrule design scheme includes a ferrule end face angle polishing design scheme, an optical fiber core inclination angle grinding design scheme and an alignment offset error compensation design scheme.

6. A method for designing a prefabricated optical fiber ferrule for secondary wiring according to claim 5, characterized in that: The ferrule end face angle polishing design scheme includes: Calculate the return loss of the optical fiber ferrule, and polish the optical fiber ferrule at a preset tilt angle based on the calculation result of the return loss to reduce Fresnel reflection in the optical fiber ferrule connection; The refractive index of the external medium is kept consistent with that of the optical fiber ferrule, and the end face angle of the optical fiber ferrule is controlled within a preset range.

7. A method for designing a prefabricated optical fiber ferrule for secondary wiring according to claim 6, characterized in that: The refractive index of the external medium in the step of keeping the refractive index of the external medium consistent with that of the optical fiber ferrule is 1.445-1.465; The preset range of controlling the end face angle of the optical fiber ferrule within a preset range is 7.0°-8.0°.

8. A method for designing a prefabricated optical fiber ferrule for secondary wiring according to claim 7, characterized in that: The calculation formula of the return loss of the optical fiber ferrule is: RL=-10×log 10 (R); Where RL represents the return loss of the optical fiber ferrule; R in represents the Fresnel reflection coefficient under vertical incidence; R represents the Fresnel reflection coefficient; n2 represents the refractive index of the medium outside the optical fiber; λ represents the wavelength of the optical fiber; e represents the base of the natural logarithm; Represents the mode field diameter of the optical fiber.

9. The method for designing a prefabricated optical fiber ferrule for secondary wiring according to claim 1, characterized in that: The method of predicting the performance of the optical fiber connector in an environmental scenario in combination with the optical fiber ferrule design scheme, and optimizing the optical fiber ferrule design scheme based on the performance includes: Based on the fiber ferrule design scheme and using finite element analysis technology to simulate the behavior response characteristics of fiber optic connectors under different environmental conditions; Obtain historical performance data of optical fiber connectors to establish a performance prediction model, and use behavioral response characteristics as input to predict the performance of optical fiber connectors under different environmental conditions through the performance prediction model; Analyze the performance of fiber optic connectors to determine the design parameters that have the greatest impact on performance, and optimize the fiber optic ferrule design based on the analysis results.

10. A method for designing a prefabricated optical fiber ferrule for secondary wiring according to claim 9, characterized in that: The fiber optic ferrule design scheme and the finite element analysis technology used to simulate the behavior response characteristics of the fiber optic connector under different environmental conditions include: Extract the fiber ferrule design and use finite element analysis technology to establish a three-dimensional geometric model of the fiber optic connector, and set material properties for each component in the three-dimensional geometric model; Mesh the 3D geometry and apply boundary conditions including fixed support points, load types and load areas; Use preconfigured solvers to solve the behavior of 3D geometric models under different boundary conditions and adjust the solver configuration to ensure convergence of the solution process; The response results of the three-dimensional geometric model under different boundary environment conditions are obtained, and the response results are fused to obtain the behavioral response characteristics of the optical fiber connector.

Images