A reflective coaxial multi-core optical fiber core arrangement device and a preparation method thereof

Abstract

This invention provides a reflective coaxial multi-core optical fiber core arrangement device and its fabrication method. The device includes a substrate, and an optical fiber clamp, a single-layer constraint assembly, and an optical fiber bundle arrangement block mounted on the substrate. Both the single-layer constraint assembly and the optical fiber bundle arrangement block are detachably mounted in the middle of the substrate, with the single-layer constraint assembly located directly above the optical fiber bundle arrangement block. The single-layer constraint assembly includes a single-layer optical fiber arrangement plate, a movable support plate, and an optical fiber clamping spring. Two movable support plates, arranged side-by-side, are mounted on the top surface of the single-layer optical fiber arrangement plate, and their spacing is adjustable. An inclined hexagonal arrangement groove is formed at the top of the optical fiber bundle arrangement block. This invention utilizes a detachable single-layer constraint assembly for the arrangement and bonding of single-layer optical fibers; and a hexagonal arrangement groove is provided below the single-layer constraint assembly. Repeated operations yield a regular hexagonal coaxial multi-core optical fiber bundle with a specific spatial arrangement.

Description

Technical Field

[0001] This invention belongs to the field of optical fiber devices and optical fiber sensing, and specifically relates to a reflective coaxial multi-core optical fiber core arrangement device and its preparation method. Background Technology

[0002] A reflective fiber optic sensor is a device that uses optical fibers as the transmission medium to measure parameters through optical principles. Fiber optic sensing technology leverages the high precision, high sensitivity, and strong anti-interference capabilities of optical fibers to measure physical quantities such as temperature, pressure, deformation, vibration, and flow rate. Among these, reflective intensity-modulated optical fibers are widely used in industrial production and precision displacement measurement in laboratories due to their advantages of simple structure, low cost, ease of implementation, and wide range of applications.

[0003] In reflective coaxial fiber optics, the fiber bundle structure significantly impacts the measurement of the entire system signal, primarily affecting parameters such as the sensor's response range, linear range, and sensitivity. Besides the fiber's structural parameters, the fiber bundle arrangement also influences the output voltage-displacement curve. Basic arrangements include coaxial, semi-circular, and random arrangements. Different applications have different design requirements. Existing coaxial fiber optic sensors, with their basic circular arrangement, cannot fully meet application and research needs. Furthermore, different probe designs require precise core fiber arrangement before subsequent production and processing. Summary of the Invention

[0004] The purpose of this invention is to provide a reflective coaxial multi-core optical fiber core arrangement device and preparation method, which can independently complete the optical fiber arrangement according to requirements, and then realize the probe through certain processing and manufacturing.

[0005] To achieve the above-mentioned objectives, this invention provides the following technical solution:

[0006] In a first aspect, the present invention provides a reflective coaxial multi-core optical fiber core arrangement device, comprising a substrate, and an optical fiber clamp, a single-layer constraint assembly, and an optical fiber bundle arrangement block mounted on the substrate. Both the single-layer constraint assembly and the optical fiber bundle arrangement block are detachably mounted in the middle of the substrate, with the single-layer constraint assembly located directly above the optical fiber bundle arrangement block. The optical fiber clamp is aligned with the optical fiber bundle arrangement block.

[0007] The single-layer constraint assembly includes a single-layer fiber optic deployment board, movable support plates, and fiber optic clamping springs. Two movable support plates, arranged side-by-side, are mounted on the top surface of the single-layer fiber optic deployment board, and their spacing is adjustable. The fiber optic clamping springs are mounted on the top surface of the single-layer fiber optic deployment board at the end opposite to the fiber optic clamp.

[0008] The top of the fiber bundle arranging block is provided with an inclined hexagonal arranging groove; the hexagonal arranging groove has four constraint surfaces for arranging multiple fiber filaments in a regular hexagonal pattern.

[0009] Preferably, the top surface of the single-layer fiber optic array is inclined. The fiber optic output port of the fiber optic clamp is located within the inclined plane of the top surface of the single-layer fiber optic array.

[0010] Preferably, the single-layer constraint assembly is detachably mounted on the substrate via a quick-release structure. Both ends of the single-layer fiber optic routing board are integrally formed with mounting plates. The quick-release structure includes hand-tightening bolts, first mounting studs, and second mounting studs. The two first mounting studs and two second mounting studs are arranged in a rectangular pattern and fixed to the substrate. The two first mounting studs are located at the end of the fiber bundle filament block near the fiber clamp; the two second mounting studs are located at the end of the fiber bundle filament block away from the fiber clamp; four hand-tightening bolts are screwed onto the two first mounting studs and two second mounting studs respectively. The four U-shaped grooves on the two mounting plates respectively engage with the corresponding mounting studs and hand-tightening bolts. The length of the first mounting stud is less than the length of the second mounting stud. The mounting plate of the single-layer fiber optic routing board near the fiber clamp is folded downwards by sheet metal, so that the end edge of the single-layer fiber optic routing board near the fiber clamp forms an arc-shaped structure.

[0011] Preferably, the single-layer fiber optic cable has multiple bolt holes. The movable support plate has multiple waist-shaped adjustment holes extending along the width direction of the single-layer fiber optic cable. The movable support plate is fixed to the threaded holes on the single-layer fiber optic cable by adjustment bolts passing through the waist-shaped adjustment holes.

[0012] Preferably, in the hexagonal wire-laying groove, the two adjacent constraint surfaces form a 120° angle; the constraint surface at the bottom is horizontally positioned.

[0013] Preferably, the system also includes an optical fiber tensioning slide. The optical fiber clamp and the optical fiber tensioning slide are respectively fixed to both ends of the top surface of the substrate. The optical fiber tensioning slide is equipped with a hexagonal inner hole clamp. The optical fiber tensioning slide can drive the hexagonal inner hole clamp to move along the length of the substrate, thereby straightening the optical fiber whose end is clamped by the hexagonal inner hole clamp.

[0014] Preferably, the system also includes multiple temporary fiber optic placement stages mounted on the substrate. These stages are located between the fiber bundle arranging block and the fiber clamps. Each temporary placement stage is positioned to hold the fiber optic cable to be arranged.

[0015] Preferably, the fiber optic clamp includes a base plate, a pressure plate, and a rubber pad; the base plate has multiple V-grooves for positioning the fiber bundle; the rubber pad is fixed to the bottom surface of the pressure plate; the pressure plate and the base plate are clamped together by a set of bolts. During operation, the fiber is compressed and fixed between the rubber pad and the base plate.

[0016] Preferably, a lateral fixing clamp is also included. A mounting groove is formed in the center of the top surface of the substrate. The fiber bundle assembly is placed in the mounting groove and clamped by the lateral fixing clamp.

[0017] Preferably, the opposite edges of the two movable backing plates are provided with an upward-folding flange structure.

[0018] Preferably, the two ends of the fiber clamping spring are fixed to two mounting posts at the tail end of the top surface of the single-layer fiber optic array. The distance between the two mounting posts can be adjusted and locked.

[0019] Secondly, the present invention provides a method for preparing a reflective coaxial multi-core optical fiber core, which uses the aforementioned reflective coaxial multi-core optical fiber core arrangement device.

[0020] The method for fabricating the core wire of the reflective coaxial multi-core optical fiber is as follows:

[0021] Step 1: Fix the multiple optical fibers that need to be bundled onto the optical fiber clamp.

[0022] Step 2: Place the fiber filaments of each type that need to be arranged in the current layer as working fiber filaments on a single-layer fiber arrangement board.

[0023] Step 3: Insert the ends of each working fiber optic cable into the gaps of the fiber clamping springs, ensuring the springs hold the ends of each cable in place. Adjust the positions of the two movable support plates so that the distance between them equals the sum of the diameters of each working fiber optic cable. Arrange the working fiber optic cables sequentially between the two support plates and secure them with adhesive to form a single-layer fiber optic cable.

[0024] Step 4: Separate each working fiber filament from the fiber clamping springs and the two movable support plates, and remove the single-layer fiber arrangement plate to expose the fiber bundle arrangement block; place the single-layer fiber into the hexagonal arrangement slot of the fiber bundle arrangement block. If the single-layer fiber placed is not the first layer fiber in the hexagonal arrangement slot, use glue to bond and fix the single-layer fiber placed in the hexagonal arrangement slot to the original fiber in the hexagonal arrangement slot.

[0025] Step 5: Reinstall the single-layer constraint assembly onto the substrate.

[0026] Step 6: Repeat steps 2 to 5 until the required hexagonal fiber bundle is formed in the hexagonal fiber arrangement groove.

[0027] Step 7: Remove the fiber bundle from the hexagonal fiber tray and cut off the waste material, then perform a fused taper process to obtain the fiber probe.

[0028] Compared with the prior art, the beneficial effects of the present invention are:

[0029] 1. This invention utilizes a detachable single-layer constraint component for the arrangement and bonding of single-layer optical fibers; and sets a hexagonal fiber arrangement groove below the single-layer constraint component, so that the single-layer optical fiber can be placed into the hexagonal fiber arrangement groove for positioning after the single-layer constraint component is removed; by repeatedly disassembling and assembling the single-layer constraint component, a regular hexagonal coaxial multi-core optical fiber bundle with a specific spatial arrangement can be obtained.

[0030] 2. The present invention has a simple structure, is easy to manufacture and assemble. Through the layered design of the manufacturing process and the innovative hexagonal fiber arrangement groove tooling fixture, it has wide applicability and can be easily designed and completed according to the needs of different fiber arrangement parameters such as core number and diameter. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structure of the present invention.

[0032] Figure 2 This is a side view of the present invention.

[0033] Figure 3 This is a schematic diagram of the operation process of the present invention.

[0034] Figure 4 This is a schematic diagram of the structure of the single-layer optical fiber arrangement plate in this invention.

[0035] Figure 5 This is a schematic diagram of the cross-sectional arrangement of various optical fibers in the optical fiber bundle filament block of the present invention.

[0036] Figure 6 This is a flowchart illustrating the operation of the present invention.

[0037] Reference numerals in the attached figures: 1-Fiber optic clamp; 2-First temporary fiber optic placement stage; 3-Single-layer fiber optic arrangement board; 4-Moving support plate; 5-Hand-tightening bolt; 6-Tension spring; 7-Second temporary fiber optic placement stage; 8-First mounting stud; 9-Lateral fixing clamp; 10-Fiber optic bundle filament block; 11-Second mounting stud; 12-Fiber optic tensioning slide; 13-Substrate. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings.

[0039] The present invention and its embodiments are described below. This description is not restrictive, and actual embodiments are not limited thereto. In short, if those skilled in the art are inspired by this description and, without departing from the spirit of the invention, design similar structures and embodiments to this technical solution, such designs should fall within the protection scope of the present invention.

[0040] like Figure 1As shown, a reflective coaxial multi-core optical fiber core arrangement device includes a substrate 13, and an optical fiber clamp 1, a single-layer constraint assembly, a quick-release structure, a first temporary optical fiber placement stage 2, a second temporary optical fiber placement stage 7, an optical fiber bundle arrangement block 10, a lateral fixing clamp 9, and an optical fiber tensioning slide 12 mounted on the substrate 13.

[0041] A mounting groove is formed in the middle of the top surface of substrate 13. Fiber optic bundle arranging block 10 is installed in the mounting groove and clamped by lateral fixing clamp 9. Fiber optic clamp 1 and fiber optic tensioning slide 12 are respectively fixed at both ends of the top surface of substrate 13. First temporary fiber optic placement stage 2 and second temporary fiber optic placement stage 7 are arranged along the width direction of the substrate and are both located between fiber optic bundle arranging block 10 and fiber optic clamp 1. A single-layer constraint assembly is detachably installed in the middle of substrate 13 via a quick-release structure and is located directly above fiber optic bundle arranging block 10.

[0042] The central axes of the fiber clamp 1, the single-layer fiber optic arrangement plate 3 in the single-layer constraint assembly, the fiber bundle arrangement block 10, and the fiber tensioning slide 12 are all located in the same vertical plane.

[0043] The single-layer constraint assembly includes a single-layer fiber optic routing plate 3, movable backing plates 4, and fiber optic clamping springs 6. The single-layer fiber optic routing plate 3 is 1mm thick and has multiple bolt holes. Two movable backing plates 4 are arranged side-by-side with a gap between them on the single-layer fiber optic routing plate 3. Multiple waist-shaped adjustment holes extending along the width direction of the single-layer fiber optic routing plate 3 are provided on the movable backing plates 4. The movable backing plates 4 are fixed to the threaded holes on the single-layer fiber optic routing plate 3 by adjusting bolts passing through the waist-shaped adjustment holes. Loosening the adjusting bolts allows the movable backing plates 4 to be moved laterally to adjust the distance between the two movable backing plates 4. The opposite edges of the two movable backing plates 4 have upward-folding flanges for easy gripping by the user.

[0044] The two ends of the fiber clamping spring 6 are respectively fixed to two mounting posts at the tail end of the top surface of the single-layer fiber optic cabling plate 3. The distance between the two mounting posts can be adjusted and locked to facilitate adjustment of the tension length of the fiber clamping spring 6. The fiber clamping spring 6 is used to clamp the tail end of the fiber optic filament during single-layer fiber optic cabling.

[0045] Both ends of the single-layer fiber optic cabling board 3 are integrally formed with mounting plates. The mounting plate at the head end of the single-layer fiber optic cabling board 3 is folded downwards by 180° through sheet metal, so that the edge of the head end of the single-layer fiber optic cabling board 3 forms an arc-shaped structure; this arc-shaped structure helps to avoid compression damage during single-layer fiber optic cabling. Both ends of the same side edge of the two mounting plates are provided with U-shaped grooves for connecting quick-release structures.

[0046] The quick-release structure includes a hand-tightening bolt 5, a first mounting stud 8, and a second mounting stud 11. The two first mounting studs 8 and the two second mounting studs 11 are arranged in a rectangular pattern and fixed to the substrate 13. The two first mounting studs 8 are located at the end of the fiber bundle arranging block 10 closest to the fiber clamp 1; the two second mounting studs 11 are located at the end of the fiber bundle arranging block 10 furthest from the fiber clamp 1.

[0047] The top surfaces of the first mounting stud 8 and the second mounting stud 11 are used to support the mounting plates on the single-layer fiber optic cabling board 3, and are provided with threaded holes. Four hand-tightening bolts 5 are respectively screwed onto the two first mounting studs 8 and the two second mounting studs 11. The four U-shaped grooves on the two mounting plates respectively engage between the corresponding mounting studs and hand-tightening bolts 5.

[0048] In some embodiments, the length of the first mounting stud 8 is less than the length of the second mounting stud 11, so that the top surface of the single-layer fiber optic cabling board 3 is tilted upwards along the direction from the fiber clamp 1 to the fiber tensioning slide 12. A length difference of 5-10 mm between the first mounting stud 8 and the second mounting stud 11 is acceptable. In some further embodiments, the fiber optic output port of the fiber clamp 1 is located within the tilted plane of the top surface of the single-layer fiber optic cabling board 3, so that the tilted and raised fiber output from the fiber clamp 1 will not bend at the edge of the head end of the single-layer fiber optic cabling board 3.

[0049] The fiber optic clamp 1 includes a base plate, a pressure plate, and rubber pads. The base plate has two V-grooves for positioning the fiber bundles. The depth parameters of the V-grooves are designed, selected, and replaced according to the diameter of the fibers to be bundled. The rubber pads are fixed to the bottom surface of the pressure plate. The pressure plate and base plate are tightened together by a set of bolts. During operation, the optical fibers are compressed and fixed between the rubber pads and the base plate.

[0050] The first temporary fiber optic placement stage 2 and the second temporary fiber optic placement stage 7 have the same structure, both including an arc-shaped base and an arc-shaped flip bar. The arc-shaped base is fixed to the substrate 13; one end of the arc-shaped flip bar is hinged to one end of the top of the arc-shaped base. The other end of the arc-shaped flip bar and the other end of the top of the arc-shaped base are provided with permanent magnets that can attract each other. This allows the temporary fiber optic placement stage to be magnetically closed, constraining the fiber bundle placed therein.

[0051] The fiber bundle arrangement block 10 has an inclined hexagonal fiber arrangement groove on its top; the hexagonal fiber arrangement groove is symmetrical about the inclined surface which forms a 30° angle with the vertical plane. The hexagonal fiber arrangement groove has four constraint surfaces. The angle between two adjacent constraint surfaces is 120°; the constraint surface at the bottom is set horizontally; so that the fiber filaments placed in the hexagonal fiber arrangement groove can be arranged in a tight hexagonal pattern.

[0052] The fiber bundle filament arrangement block 10 is manufactured by 3D printing; the size of the hexagonal filament arrangement groove is designed and modified according to the diameter and number of fiber filaments after bundling; the commonly used number of fiber cores is 7, 19, or 37.

[0053] Furthermore, the fiber tensioning slide 12 at the tail end is mounted and fixed to the substrate 13. A matching hexagonal inner hole clamp is installed on the slide, and a pressure plate is provided in the inner layer of the clamp. The slide travel is 5-10mm, which is adjusted and fixed by hand-tightening bolts. The hexagonal inner hole clamp is used to clamp the tail end of the fiber filament after it is arranged, so that the fiber filament in the hexagonal fiber arrangement groove can be in a taut state.

[0054] The working method of this reflective coaxial multi-core fiber optic core arrangement device is as follows:

[0055] Step 1: Fix the transmitting fiber and receiving fiber bundle into the two V-grooves of the fiber clamp 1 respectively.

[0056] Step 2: Based on the number of fiber optic strands required for a single layer, place the transmitting and receiving fiber optic strands to be bonded as working fiber optic strands on the single-layer fiber optic arrangement board 3, and place the remaining fiber optic strands in the first temporary fiber optic placement platform 2 and the second temporary fiber optic placement platform 7 for later use.

[0057] Step 3: Insert the ends of each working fiber optic cable into the gaps of the fiber clamping spring 6, so that the fiber clamping spring 6 clamps the ends of each fiber optic cable. Adjust the positions of the two movable plates 4 so that the distance between the two movable plates 4 is equal to the sum of the diameters of each working fiber optic cable. Arrange each working fiber optic cable tightly in the positioning groove structure formed between the two movable plates 4 in a preset order, and fix them with UV glue to form a single layer of optical fiber.

[0058] Step 4: Remove the fiber clamping spring 6 from each working fiber filament, move the two moving plates 4 outwards, loosen all hand-tightening bolts, and disassemble the single-layer constraint assembly; expose the fiber bundle filament arrangement block 10; place the fabricated single-layer fiber into the hexagonal filament arrangement groove of the fiber bundle filament arrangement block 10. Clamp the tail ends of each fiber filament in the single-layer fiber onto the fiber tensioning slide 12 and tighten them. If the single-layer fiber placed is not the first layer fiber in the hexagonal filament arrangement groove, apply UV glue to the single-layer fiber before placing it into the hexagonal filament arrangement groove so that the placed single-layer fiber can be bonded to the existing fiber in the hexagonal filament arrangement groove.

[0059] Step 5: Reinstall the single-layer constraint assembly onto the substrate.

[0060] Step 6: Repeat steps 2 to 5 until the required hexagonal fiber bundle is formed in the hexagonal fiber arrangement groove.

[0061] Step 7: Remove the fiber bundle from the hexagonal fiber tray and cut off the waste material (the unbonded part of the fiber filament tail). Then, perform processes such as fusion tapering to complete the fabrication of the fiber optic probe. After removing the fiber bundle, glue residue may remain in the hexagonal fiber tray. In this case, the subsequent production can be resumed by replacing the fiber bundle tray 10.

[0062] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Although this document uses many terms corresponding to the reference numerals in the figures, the possibility of using other terms is not excluded; the use of these terms is merely for the purpose of more conveniently describing and explaining the essence of the present invention; interpreting them as any kind of additional limitation would be contrary to the spirit of the present invention.

Claims

1. A reflection type coaxial multi-core optical fiber core arrangement device, comprising a substrate (13) and an optical fiber clamp (1) mounted on the substrate (13); characterized in that: It also includes a single-layer constraint assembly and a fiber bundle filament block (10) mounted on the substrate (13); both the single-layer constraint assembly and the fiber bundle filament block (10) can be detachably mounted in the middle of the substrate (13), and the single-layer constraint assembly is located directly above the fiber bundle filament block (10); the fiber clamp (1) is aligned with the fiber bundle filament block (10); The single-layer constraint assembly includes a single-layer fiber optic layout plate (3), a movable support plate (4), and a fiber optic clamping spring (6); the two movable support plates (4) arranged side by side are installed on the top surface of the single-layer fiber optic layout plate (3), and their spacing can be adjusted; the fiber optic clamping spring (6) is installed on the end of the top surface of the single-layer fiber optic layout plate (3) away from the fiber optic clamp (1); An inclined hexagonal wire arrangement groove is provided on the top of the fiber bundle wire arrangement block (10); The hexagonal fiber arrangement groove has four constraint surfaces, which are used to arrange multiple optical fibers in a regular hexagonal shape; The single-layer constraint assembly is detachably mounted on the substrate (13) via a quick-release structure; both ends of the single-layer fiber optic arrangement board (3) are integrally formed with mounting plates; the quick-release structure includes a hand-tightening bolt (5), a first mounting stud (8), and a second mounting stud (11); the two first mounting studs (8) and the two second mounting studs (11) are arranged in a rectangular pattern and fixed on the substrate (13); the two first mounting studs (8) are located at one end of the fiber bundle filament block (10) near the fiber clamp (1); the two second mounting studs (11) are located at the fiber bundle filament block (10). The end of the fiber block (10) away from the fiber clamp (1) is screwed on two first mounting studs (8) and two second mounting studs (11) respectively; the four U-shaped grooves on the two mounting plates are respectively inserted between the corresponding mounting studs and the hand-tightening bolts (5); the length of the first mounting stud (8) is less than the length of the second mounting stud (11); the mounting plate of the single-layer fiber optic layout plate (3) near the fiber clamp (1) is folded downward by sheet metal, so that the end edge of the single-layer fiber optic layout plate (3) near the fiber clamp (1) forms an arc-shaped structure.

2. The reflective coaxial multi-core optical fiber core arrangement device according to claim 1, characterized in that: The top surface of the single-layer fiber optic array (3) is inclined; the fiber optic output port of the fiber optic clamp (1) is located in the inclined plane of the top surface of the single-layer fiber optic array (3).

3. The reflective coaxial multi-core fiber core arrangement device according to claim 1, characterized in that: The single-layer fiber optic array (3) has multiple bolt holes; the movable support plate (4) has multiple waist-shaped adjustment holes extending along the width direction of the single-layer fiber optic array (3); the movable support plate (4) and the threaded holes on the single-layer fiber optic array (3) are fixed by adjustment bolts passing through the waist-shaped adjustment holes.

4. The reflective coaxial multi-core fiber core arrangement device according to claim 1, characterized in that: In the hexagonal wire-laying groove, the two adjacent constraint surfaces form a 120° angle; the constraint surface at the bottom is horizontally positioned.

5. The reflective coaxial multi-core fiber core arrangement device according to claim 1, characterized in that: It also includes an optical fiber tensioning slide (12); the optical fiber clamp (1) and the optical fiber tensioning slide (12) are respectively fixed at both ends of the top surface of the substrate (13); the optical fiber tensioning slide (12) is provided with a hexagonal inner hole clamp; the optical fiber tensioning slide (12) can drive the hexagonal inner hole clamp to move along the length direction of the substrate; so that the optical fiber held by the hexagonal inner hole clamp at the end is straightened.

6. The reflective coaxial multi-core fiber core arrangement device according to claim 1, characterized in that: It also includes multiple temporary fiber placement platforms mounted on the substrate (13); the temporary fiber placement platforms are located between the fiber bundle arranging block (10) and the fiber clamp (1); each temporary fiber placement platform is located where the fiber line to be arranged is placed.

7. The reflective coaxial multi-core fiber core arrangement device according to claim 1, characterized in that: The fiber clamp (1) includes a base plate, a pressure plate and a rubber pad; the base plate is provided with a plurality of V-grooves for positioning the fiber bundle; the rubber pad is fixed to the bottom surface of the pressure plate; the pressure plate and the base plate are pressed and fixed by a set of bolts; during operation, the fiber is squeezed and fixed between the rubber pad and the base plate.

8. The reflective coaxial multi-core fiber core arrangement device according to claim 1, characterized in that: It also includes a lateral fixing clamp (9); the top surface of the substrate (13) is provided with a mounting groove in the middle; the fiber bundle filament block (10) is placed in the mounting groove and clamped by the lateral fixing clamp (9).

9. A method for fabricating a reflective coaxial multi-core optical fiber core, characterized in that: Using the reflective coaxial multi-core optical fiber core arrangement device as described in claim 1 The working method of this reflective coaxial multi-core fiber optic core arrangement device is as follows: Step 1: Fix the multiple optical fibers that need to be bundled onto the optical fiber clamp (1); Step 2: Place the fiber filaments that need to be arranged in the current layer as working fiber filaments on the single-layer fiber arrangement board (3); Step 3: Place the tail end of each working optical fiber into the gap of the optical fiber clamping spring (6) so that the optical fiber clamping spring (6) clamps the tail end of each optical fiber; adjust the position of the two moving plates (4) so ​​that the distance between the two moving plates (4) is equal to the sum of the diameters of each working optical fiber; arrange each working optical fiber in sequence between the two moving plates (4) and fix them with glue to form a single layer of optical fiber. Step 4: Separate each working fiber filament from the fiber clamping spring (6) and the two movable support plates (4), and remove the single-layer fiber arrangement plate (3) to expose the fiber bundle arrangement block (10); place the single-layer fiber into the hexagonal arrangement groove of the fiber bundle arrangement block (10); if the single-layer fiber is not the first layer fiber in the hexagonal arrangement groove, use glue to bond and fix the single-layer fiber placed in the hexagonal arrangement groove to the original fiber in the hexagonal arrangement groove. Step 5: Reinstall the single-layer constraint assembly onto the substrate; Step 6: Repeat steps 2 to 5 until the required hexagonal fiber bundle is formed in the hexagonal fiber arrangement groove.

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