A bamboo-joint type hollow optical fiber, a preparation method and a processing device

Abstract

The present invention discloses a bamboo-joint type hollow optical fiber, a preparation method and a processing device thereof. In the bamboo-joint type hollow optical fiber, a preset number of outer sleeves are provided, a fiber joint piece is arranged between every two adjacent outer sleeves, the outer sleeves and the fiber joint pieces are alternately stacked, and a photonic bandgap optical fiber is arranged in the middle part of the fiber joint piece; an inner sleeve penetrates through the inner edge part of the fiber joint piece to connect the fiber joint pieces between the outer sleeves in series; the bamboo-joint type hollow optical fiber is formed by drawing the outer sleeves, the fiber joint pieces and the inner sleeve after heating and bonding reaction. Through the technical scheme of the present invention, the stability of signal transmission is improved, the optical fiber structure is simple and low loss is ensured. Moreover, the preparation process is simple and practical, the hollow optical fiber can be stably prepared, the cost is low, mass production is supported, the automation degree of the processing device is high, the use of manpower can be effectively saved, and the processing efficiency and the production quality are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical waveguide components, and in particular to a bamboo-shaped hollow-core optical fiber, a preparation method of the bamboo-shaped hollow-core optical fiber, and processing equipment for the bamboo-shaped hollow-core optical fiber. Background Art

[0002] Optical fiber, short for optical fiber, is a commonly used structure consisting primarily of a core, cladding, and coating. Optical fiber boasts low mass, light weight, and resistance to electromagnetic interference. In addition to being widely used in optical fiber communications, its most common application is in the manufacture of various devices and optical fiber sensors. Optical fiber types include single-mode fiber, multimode fiber, polarization-maintaining fiber, multi-core fiber, and hollow-core fiber.

[0003] Hollow-core optical fiber is a new type of optical fiber proposed in recent years. For example, the prior art discloses a hollow-core optical fiber comprising a core and a cladding. The core is an air hole, and the boundary between the core and the cladding forms an air hole wall. An anti-resonance ring is provided on the periphery of the air hole wall. By controlling the thickness of the anti-resonance ring to be close to the anti-resonance thickness and utilizing the principle of anti-resonance waveguide, light waves propagating in the core are reflected multiple times in the anti-resonance ring, eliminating light at the boundary between the core and the cladding, effectively reducing the coupling between the surface mode and the core mode, and improving transmission efficiency.

[0004] However, this technology requires the addition of a large number of capillaries to form an array cladding, which not only makes the optical fiber structure complex and the cost high, but also requires the addition of anti-resonance rings, and the manufacturing process is relatively cumbersome. Summary of the Invention

[0005] In response to the above problems, the present invention provides a bamboo-shaped hollow-core optical fiber and a preparation method and processing equipment. Through the setting of the fiber segment and the photonic bandgap optical fiber transmission mode designed in the middle part of the fiber segment, light propagates from the hollow-core optical fiber and enters the fiber segment to be transmitted in the form of photonic bandgap optical fiber transmission, and then enters the hollow-core optical fiber, thereby improving the stability of signal transmission. The optical fiber structure is simple and ensures low loss. Moreover, the preparation process combined with the bonding reaction is simple and practical, and the hollow-core optical fiber can be stably prepared with low cost, which supports large-scale production.

[0006] To achieve the above object, the present invention provides a bamboo-shaped hollow-core optical fiber, comprising an outer sleeve, a fiber segment sheet and an inner sleeve;

[0007] The bamboo-type hollow-core optical fiber is provided with a preset number of outer sleeves, the fiber segment pieces are provided between every two adjacent outer sleeves, the outer sleeves and the fiber segment pieces are alternately stacked, and a photonic bandgap optical fiber is provided in the middle of the fiber segment pieces;

[0008] The inner sleeve passes through the inner edge of the fiber segment pieces to connect the fiber segment pieces between the outer sleeves in series;

[0009] The bamboo - joint - type hollow optical fiber is formed by drawing the outer sleeve, the fiber - joint pieces, and the inner sleeve after heating and bonding reaction.

[0010] In the above - mentioned technical solution, preferably, a preset number of through - holes are provided at the inner edge part of the fiber - joint piece, and the inner sleeve passes through the through - holes to string the fiber - joint pieces.

[0011] In the above - mentioned technical solution, preferably, a preset number of through - holes are provided at the edge part of the fiber - joint piece, and each adjacent pair of outer sleeves is provided with a matching connection head and a connection slot. The connection head passes through the through - hole of the corresponding fiber - joint piece and inserts into the connection slot to achieve the connection between the outer sleeve and the fiber - joint piece.

[0012] In the above - mentioned technical solution, preferably, the outer sleeve is of a tubular structure, and the inner sleeve for stringing the fiber - joint pieces is arranged along the inner edge of the tube of the outer sleeve.

[0013] The present invention also provides a method for preparing a bamboo - joint - type hollow optical fiber, which is used to prepare the bamboo - joint - type hollow optical fiber disclosed in any one of the above - mentioned technical solutions, and includes:

[0014] Select a preset number of outer sleeves and fiber - joint pieces, and alternately stack the fiber - joint pieces between the outer sleeves;

[0015] Splice the outer sleeve and the fiber - joint pieces and simultaneously insert an inner sleeve to achieve the splicing of the outer sleeve, the fiber - joint pieces, and the inner sleeve;

[0016] Make the outer sleeve, the fiber - joint pieces, and the inner sleeve into a preform, place the preform in a metal sleeve, and place the metal sleeve in a 200°C graphite furnace of a drawing tower for vacuum pumping and heating;

[0017] Apply pressure in the vertical direction of the preform to enable a bonding reaction between the components of the preform;

[0018] After the bonding reaction is completed, remove the metal sleeve, and draw the preform bonded into an integral structure through the drawing tower to form the bamboo - joint - type hollow optical fiber.

[0019] In the above - mentioned technical solution, preferably, splicing the outer sleeve and the fiber - joint pieces and simultaneously inserting an inner sleeve to achieve the splicing of the outer sleeve, the fiber - joint pieces, and the inner sleeve, the specific process includes:

[0020] Insert the outer sleeve and the fiber section piece through a matching adapter and an adapter slot. At the same time, the adapter passes through the through hole provided at the upper edge of the fiber section piece to achieve the splicing of the outer sleeve and the fiber section piece;

[0021] The inner sleeve passes through the series of holes provided at the inner edge of the fiber section piece layer by layer to achieve the splicing of the inner sleeve and the fiber section piece.

[0022] The present invention also proposes a processing device for a bamboo-joint type hollow optical fiber, which is applied to the preparation method of the bamboo-joint type hollow optical fiber disclosed in any one of the above technical solutions, including: a box body, a blocking component and a pressing component;

[0023] The metal sleeve is installed in the box body, the blocking component is arranged at the bottom of the box body, and the pressing component is arranged at the top of the box body;

[0024] The preform formed by splicing the outer sleeve, the fiber section piece and the inner sleeve is installed in the metal sleeve, and the blocking component and the pressing component can clamp the preform in the metal sleeve;

[0025] During the bonding reaction process, the blocking component and the pressing component can apply a preset pressure to the preform in the up and down directions.

[0026] In the above technical solution, preferably, the blocking component includes a flat plate, a rotating ring, a guiding gear, a fan-shaped plate, a driving gear, an upper shell, a limiting plate and a limiting activity groove;

[0027] A through hole is provided in the central part of the flat plate. The rotating ring is located outside the through hole and is rotatably connected to the flat plate. Four evenly distributed inner teeth are provided on the inner wall of the ring body of the rotating ring, and the inner teeth are meshed with the guiding gear;

[0028] The guiding gear is rotatably connected to the flat plate and is integrally connected to the fan-shaped plate. The fan-shaped plate can be closed or unfolded synchronously with the rotation of the guiding gear, and when one end of the fan-shaped plate is in the closed state, it can block the through hole;

[0029] External teeth are provided on the outer wall of the ring body of the rotating ring, and the external teeth are meshed with the driving gear. The driving gear is fixedly installed on the side wall of the flat plate through a connecting seat;

[0030] The upper shell is fixedly covered above the flat plate. The limiting activity groove is arranged inside the upper shell, and the limiting plate is fixed in the limiting activity groove above the rotating ring.

[0031] In the above technical solution, preferably, an inner clamping plate is provided inside the metal sleeve, and the inner clamping plate fits inside the metal sleeve;

[0032] The tightening component includes a guide rod, a first baffle, a second baffle, a spring, a push plate, a sliding seat, a slide rail, a movable rod, a threaded nut, and a bidirectional threaded drive screw rod. One end of the guide rod passes through the metal sleeve and is connected to the inner clamping plate, and the other end is connected to the first baffle and the second baffle;

[0033] The spring and the push plate are both sleeved on the guide rod and are arranged between the first baffle and the second baffle. One end of the spring abuts against the first baffle, and the other end abuts against the push plate. The push plate maintains relative sliding with the guide rod;

[0034] The two ends of the push plate are hinged with the movable rods, and the two ends of the push plate are arranged on the slide rails provided on the inner wall of the box body through the sliding seats;

[0035] The other ends of the movable rods are respectively hinged with the threaded nuts provided at both ends of the bidirectional threaded drive screw rod, and the bidirectional threaded drive screw rod is rotatably arranged inside the box body.

[0036] In the above technical solution, preferably, the driving gear can drive the rotating ring to rotate, the rotating ring drives the guiding gear and the fan blade plate to rotate synchronously, and when the fan blade plate gathers inward and closes, it can block the through hole to prevent the preform from slipping out of the metal sleeve;

[0037] The rotation of the bidirectional threaded drive screw rod can drive the movable rod and the push plate to move. The push plate drives the compression spring to apply a force to the inner clamping plate, and the preform opens the fan blade plate under the clamping and fixing of the inner clamping plate, so that the preform can be suspended and fixed inside the metal sleeve.

[0038] Compared with the prior art, the beneficial effects of the present invention are as follows: Through the setting of the fiber nodes and the photon bandgap optical fiber transmission mode designed in the middle part of the fiber nodes, light propagates from the hollow optical fiber and then enters the fiber node to be transmitted in the form of photon bandgap optical fiber transmission, and then enters the hollow optical fiber again, which improves the stability of signal transmission. The optical fiber structure is simple and ensures low loss. Moreover, the preparation process of the bonding reaction is simple and practical, and the hollow optical fiber can be stably prepared with low cost and supports mass production. In addition, the processing equipment for the bamboo joint hollow optical fiber has a high degree of automation, can effectively save the use of manpower, and improves the processing efficiency and production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1Schematic front view structure of a bamboo - joint - type hollow optical fiber disclosed in an embodiment of the present invention;

[0040] Figure 2 Schematic front - view sectional structure of an outer sleeve, a fiber - node slice, an inner sleeve, and a photonic - band - gap optical fiber placed in a metal sleeve disclosed in an embodiment of the present invention;

[0041] Figure 3 Schematic cross - sectional structure of a fiber - node slice at a non - fiber - node position disclosed in an embodiment of the present invention;

[0042] Figure 4 Schematic cross - sectional structure of a fiber - node slice at a fiber - node position disclosed in an embodiment of the present invention;

[0043] Figure 5 Schematic structure of through - holes and string - holes on a fiber - node slice disclosed in an embodiment of the present invention;

[0044] Figure 6 Schematic front - view sectional structure of an outer sleeve, a fiber - node slice, and an inner sleeve disclosed in an embodiment of the present invention;

[0045] Figure 7 Schematic front - view sectional structure of two adjacent outer sleeves disclosed in an embodiment of the present invention;

[0046] Figure 8 Schematic structure of a wire - drawing tower and a processing device for bamboo - joint hollow optical fiber disclosed in an embodiment of the present invention;

[0047] Figure 9 Schematic internal structure of a processing device for bamboo - joint hollow optical fiber disclosed in an embodiment of the present invention;

[0048] Figure 10 Schematic top - view structure of a metal sleeve disclosed in an embodiment of the present invention;

[0049] Figure 11 Schematic internal top - view structure of a blocking component disclosed in an embodiment of the present invention;

[0050] Figure 12 Schematic external top - view structure of a blocking component disclosed in an embodiment of the present invention.

[0051] In the figure, the corresponding relationship between each component and the reference numeral is as follows:

[0052] 1. Outer sleeve; 101. Connector; 102. Connection slot; 103. Inner sleeve; 2. Fiber node piece; 201. Through hole; 202. String hole; 3. Photonic bandgap fiber; 4. Drawing tower; 5. Processing equipment; 501. Box body; 6. Metal sleeve; 601. Inner layer splint; 7. Guide rod; 701. First baffle; 702. Second baffle; 703. Spring; 704. Push plate; 705. Slide seat; 706. Slide rail; 707. Moving rod; 708. Threaded cap; 709. Bidirectional threaded drive screw rod; 8. Blocking component; 801. Flat plate; 802. Upper shell; 803. Driving gear; 804. Connection seat; 805. Rotating ring; 806. Inner tooth; 807. Guide gear; 808. Fan blade plate; 809. Outer tooth; 810. Limit plate; 811. Limit moving slot. Detailed implementation manners

[0053] To make the purposes, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0054] The following further describes the present invention in detail with reference to the accompanying drawings:

[0055] As Figures 1 to 7 shown, a bamboo joint type hollow fiber according to the present invention includes an outer sleeve 1, a fiber node piece 2 and an inner sleeve 103;

[0056] The bamboo joint type hollow fiber is provided with a preset number of sections of outer sleeves 1. A fiber node piece 2 is arranged between every two adjacent sections of outer sleeves 1. The outer sleeves 1 and the fiber node pieces 2 are alternately stacked. A photonic bandgap fiber 3 is arranged in the middle part of the fiber node piece 2;

[0057] The inner sleeve 103 passes through the inner edge part of the fiber node piece 2 to connect the fiber node pieces 2 between the outer sleeves 1 in series;

[0058] The bamboo joint type hollow fiber is formed by drawing the outer sleeve 1, the fiber node piece 2 and the inner sleeve 103 after heating and bonding reaction.

[0059] In this embodiment, through the arrangement of the fiber segment 2 and the transmission mode of the photonic bandgap fiber 3 designed in the middle part of the fiber segment, after the hollow-core fiber is connected to the optical signal, the optical signal propagates from the hollow-core fiber into the fiber segment 2 and is transmitted in the form of the photonic bandgap fiber 3, and then enters the hollow-core fiber again, and this process is repeated, thereby improving the stability of signal transmission. The optical fiber structure is simple and low loss is guaranteed. Moreover, the preparation process of the bonding reaction is simple and practical, and the hollow-core fiber can be stably prepared at a low cost, supporting large-scale production. In addition, the processing equipment 5 of the bamboo hollow-core fiber has a high degree of automation, which can effectively save manpower and improve processing efficiency and production quality.

[0060] Specifically, the preform is a proportional enlargement of the optical fiber. For example, if the diameter of the optical fiber is 125um, the diameter of the preform can be 125mm.

[0061] In the above embodiment, preferably, a preset number of string holes 202 are provided on the inner edge of the fiber segment piece 2 , and the inner sleeve 103 is connected to the fiber segment piece 2 in series through the string holes 202 .

[0062] In the above embodiment, preferably, a preset number of through holes 201 are provided at the edge of the fiber segment piece 2, and each two adjacent sections of the outer sleeve 1 are provided with a matching connector 101 and a connecting slot 102, and the connector 101 passes through the through hole 201 of the corresponding fiber segment piece 2 and is inserted into the connecting slot 102 to realize the connection between the outer sleeve 1 and the fiber segment piece 2.

[0063] In the above embodiment, preferably, the outer sleeve 1 is a tubular structure, and the inner sleeve 103 for serially connecting the fiber segment sheets 2 is disposed along the inner edge of the outer sleeve 1 .

[0064] The present invention further provides a method for preparing a bamboo-shaped hollow-core optical fiber, which is used to prepare the bamboo-shaped hollow-core optical fiber disclosed in any of the above embodiments, comprising:

[0065] Select a preset number of outer sleeves 1 and fiber segment pieces 2, and stack the fiber segment pieces 2 between the outer sleeves 1;

[0066] Splice the outer sleeve 1 and the fiber segment piece 2 together and insert them into the inner sleeve 103 at the same time to achieve splicing of the outer sleeve 1, the fiber segment piece 2 and the inner sleeve 103;

[0067] The outer sleeve 1, the fiber segment sheet 2 and the inner sleeve 103 are made into a preform rod, the preform rod is placed in a metal sleeve 6, and the metal sleeve 6 is placed in a 200°C graphite furnace of a drawing tower 4 for vacuuming and heating;

[0068] Applying pressure in the upper and lower directions of the preform rod to cause bonding reactions between the components of the preform rod;

[0069] After the bonding reaction is completed, the metal sleeve 6 is removed, and the preform bonded into an integral structure is drawn through the drawing tower 4 to form a bamboo-joint type hollow fiber optic cable.

[0070] In this embodiment, the specific dimensions of the bamboo-joint hollow fiber optic cable after processing can be as follows: the outer sleeve 1 has a diameter of 125 μm and a wall thickness of 10 μm; the inner sleeve 103 has a diameter of 31 μm or 28 μm and a wall thickness of 0.5 μm; the thickness of the fiber node piece 22 in the preform is set to 10 μm, the spacing before the fiber node piece 22 is set to 0.5 mm, and there is one fiber node every 500 m in the drawn fiber optic cable; after being drawn into a fiber optic cable, the thickness of the fiber node piece 2 of the preform is 1 m.

[0071] Specifically, during the drawing process, a pressure of 2 times the self-weight of the metal sleeve 6 is applied to the preform in the vertical direction, and then a gas pressure of 0.3 - 2 MPa is applied to the inside of the fiber optic cable through the unclosed air holes at the end face of the photonic bandgap fiber 3. Then, the fiber optic cable is subjected to a first heat treatment and a first drawing. After the first drawing, the gas pressure applied inside the fiber optic cable is reduced to 0.11 - 0.5 MPa, and the fiber optic cable is subjected to a second heat treatment, and a second drawing is performed during the second heating until a hollow in-line fiber optic cable micro-unit is formed. Among them, the drawing speed of the first drawing is 1.2 mm / minute, and the drawing speed of the second drawing is 15 mm / minute.

[0072] In the above embodiment, preferably, the outer sleeve 1 and the fiber node piece 2 are spliced and inserted into the inner sleeve 103 at the same time to achieve the splicing of the outer sleeve 1, the fiber node piece 2, and the inner sleeve 103. The specific process includes:

[0073] The outer sleeve 1 and the fiber node piece 2 are inserted and connected through the matching adapter 101 and the adapter slot 102. At the same time, the adapter 101 passes through the through hole 201 provided at the upper edge part of the fiber node piece 2 to achieve the splicing of the outer sleeve 1 and the fiber node piece 2;

[0074] The inner sleeve 103 passes through the series of holes 202 provided at the inner edge part of the fiber node piece 2 layer by layer to achieve the splicing of the inner sleeve 103 and the fiber node piece 2.

[0075] In the above embodiments, each adjacent two outer sleeves 1 form a mortise and tenon structure through the connecting head 101 and the connecting slot 102. After the connecting head 101 passes through the through hole 201 of the fiber section piece 2, it is inserted into the connecting slot 102 to splice the multi-section outer sleeves 1 and the fiber section piece 2. During the implementation process, after the multi-section outer sleeves 1 and the fiber section piece 2 are spliced, the inner sleeve 103 is inserted into the corresponding string holes 202; alternatively, the inner sleeve 103 is inserted while the outer sleeve 1 and the fiber section piece 2 are being spliced. After the outer sleeve 1, the fiber section piece 2 and the inner sleeve 103 are integrally spliced to form a preform, the preform is placed in the vacuum environment of the drawing tower 4 and preheated and melted into one body, and finally drawn into a bamboo-joint type hollow optical fiber.

[0076] As Figures 8 to 12 shown, the present invention also provides a processing device for a bamboo-joint type hollow optical fiber, which is applied to the preparation method of the bamboo-joint type hollow optical fiber disclosed in any one of the above embodiments, and includes: a box body 501, a blocking component 8 and a pressing component;

[0077] The metal sleeve 6 is installed in the box body 501, the blocking component 8 is arranged at the bottom of the box body 501, and the pressing component is arranged at the top of the box body 501;

[0078] The preform formed by splicing the outer sleeve 1, the fiber section piece 2 and the inner sleeve 103 is installed in the metal sleeve 6, and the blocking component 8 and the pressing component can clamp the preform in the metal sleeve 6;

[0079] During the bonding reaction process, the blocking component 8 and the pressing component can apply a preset pressure to the preform in the up and down directions.

[0080] In this embodiment, the metal sleeve 6 is fixedly arranged inside the box body 501, penetrates through the top of the box body 501, and its bottom is fixed on the bottom wall of the metal box body 501 through the blocking component 8. When the opening of the blocking component 8 is opened, the preform is suspended and fixed inside the metal sleeve 6, so that pressure can be increased in the up and down directions of the metal sleeve 6.

[0081] In the above embodiments, preferably, the blocking component 8 includes a flat plate 801, a rotating ring 805, a guiding gear 807, a fan blade plate 808, a driving gear 803, an upper shell 802, a limiting plate 810 and a limiting moving groove 811;

[0082] A through hole is opened in the central part of the flat plate 801. The rotating ring 805 is located outside the through hole and is rotatably connected to the flat plate 801. Four evenly distributed inner teeth 806 are arranged on the inner wall of the ring body of the rotating ring 805, and the inner teeth 806 are meshed with the guiding gear 807;

[0083] The guiding gear 807 is rotatably connected to the flat plate 801 and is integrally connected to the fan blade plate 808. The fan blade plate 808 can be synchronously closed or unfolded with the rotation of the guiding gear 807. When one end of the fan blade plate 808 is in the closed state, it can block the through hole.

[0084] External teeth 809 are provided on the outer wall of the ring body of the rotating ring 805. The external teeth 809 are meshed and connected with the driving gear 803. The driving gear 803 is fixedly installed on the side wall of the flat plate 801 through the connecting seat 804.

[0085] The upper shell 802 is fixedly covered above the flat plate 801. A limiting activity groove 811 is provided inside the upper shell 802. The limiting plate 810 is fixed in the limiting activity groove 811 above the rotating ring 805.

[0086] In the above embodiment, preferably, an inner layer clamping plate 601 is provided inside the metal sleeve 6, and the inner layer clamping plate 601 fits inside the metal sleeve 6.

[0087] The tightening component includes a guide rod 7, a first baffle 701, a second baffle 702, a spring 703, a push plate 704, a sliding seat 705, a slide rail 706, a movable rod 707, a threaded nut 708 and a double-thread driving screw rod 709. One end of the guide rod 7 passes through the metal sleeve 6 and is connected to the inner layer clamping plate 601, and the other end is connected to the first baffle 701 and the second baffle 702.

[0088] Both the spring 703 and the push plate 704 are sleeved on the guide rod 7 and are arranged between the first baffle 701 and the second baffle 702. One end of the spring 7,03 abuts against the first baffle 701, and the other end abuts against the push plate 704. The push plate 704 keeps relative sliding with the guide rod 7.

[0089] Movable rods 707 are hinged to the two ends of the edge of the push plate 704. The two ends of the push plate 704 are arranged on the slide rails 706 provided on the inner wall of the box body 501 through the sliding seats 705.

[0090] The other ends of the movable rods 707 are respectively hinged to the threaded nuts 708 provided at both ends of the double-thread driving screw rod 709. The double-thread driving screw rod 709 is rotatably arranged inside the box body 501.

[0091] During the implementation process, when the preform is placed inside the metal sleeve 6, the preform is blocked by the fan blade plate 808 of the blocking component 8 and will not fall out inside the metal sleeve 6. Through the setting of the inner layer clamping plate 601, the preform can be clamped and fixed by the inner layer clamping plate 601 in cooperation with the tightening component.

[0092] Specifically, under normal circumstances, the spring 703 is in a natural state. Since the position of the metal sleeve 6 is fixed, by moving the push plate 704 to the left, the push plate 704 will compress the spring 703, so that the spring 703 will generate elastic force, which will generate an action force on the first baffle 701 on the one hand, and on the push plate 704 on the other hand. Therefore, the guide rod 7 is subjected to force together with the first baffle 701, and can apply an action force to the inner layer splint 601. When the preform rod is placed inside the metal sleeve 6, the preform rod can be clamped and fixed by the inner layer splint 601 and suspended in the air.

[0093] In the above embodiment, preferably, the driving gear 803 can drive the rotating ring 805 to rotate, and the rotating ring 805 drives the guide gear 807 and the blade plate 808 to rotate synchronously. The blade plate 808 gathers inward and closes to block the through hole, thereby preventing the preform rod from falling out of the metal sleeve 6.

[0094] The rotation of the bidirectional threaded drive screw 709 can drive the movable rod 707 and the push plate 704 to move, and the push plate 704 drives the compression spring 703 to apply force to the inner layer splint 601. The prefabricated plate opens the fan blade 808 under the clamping and fixation of the inner layer splint 601, so that the prefabricated plate can be suspended and fixed inside the metal sleeve 6.

[0095] During operation, when the bidirectional threaded drive screw 709 rotates, the threaded caps 708 at both ends can move closer to or farther from each other, thereby driving the movable rod 707 and the push plate 704 to move. When the preform is placed into the metal sleeve 6, the driving gear 803 first drives the rotating ring 805 to rotate, which in turn drives the guide gear 807 and the four blades 808 to rotate synchronously. When the blades 808 gather inward and close, they can block the through hole and prevent the preform from falling out of the metal sleeve 6.

[0096] Then, the screw rod 709 is driven to rotate by the bidirectional thread drive, and the threaded cap 708 can drive the movable rod 707 and the push plate 704 to move. Since the spring 703 is in a natural state at the beginning, the spring 703 will be compressed by moving the push plate 704 to the left. The spring 703 will generate elastic force, which can apply force to the inner layer splint 601. The preform rod can be clamped and fixed by the inner layer splint 601. Finally, the fan blade 808 is opened, so that the preform rod is suspended and fixed inside the metal sleeve 6, thereby facilitating the subsequent pipe threading and preheating processing of the preform rod.

[0097] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A bamboo-shaped hollow-core optical fiber, characterized in that: It includes an outer sleeve, a fiber segment and an inner sleeve; The bamboo-type hollow-core optical fiber is provided with a preset number of outer sleeves, the fiber segment pieces are provided between every two adjacent outer sleeves, the outer sleeves and the fiber segment pieces are alternately stacked, and a photonic bandgap optical fiber is provided in the middle of the fiber segment pieces; The inner sleeve passes through the inner edge of the fiber segment pieces to connect the fiber segment pieces between the outer sleeves in series; The bamboo-type hollow-core optical fiber is formed by drawing the outer sleeve, the fiber segment sheet and the inner sleeve after heating and bonding reaction.

2. The bamboo hollow core optical fiber according to claim 1, characterized in that: A preset number of string holes are provided on the inner edge of the fiber segment sheet, and the inner sleeve is connected to the fiber segment sheet in series through the string holes.

3. The bamboo hollow core optical fiber according to claim 1, characterized in that: A preset number of through holes are provided at the edge of the fiber segment sheet, and the outer sleeves of each two adjacent segments are provided with matching connectors and connector slots. The connectors pass through the through holes of the corresponding fiber segment sheet and are inserted into the connector slots to achieve connection between the outer sleeve and the fiber segment sheet.

4. The bamboo hollow core optical fiber according to claim 1, characterized in that: The outer sleeve is a tubular structure, and the inner sleeve connected in series with the fiber segment sheets is arranged along the inner edge of the outer sleeve.

5. A method for preparing a bamboo-shaped hollow-core optical fiber, characterized in that: For preparing a bamboo-type hollow-core optical fiber according to any one of claims 1 to 4, comprising: Selecting a preset number of outer sleeves and fiber segment pieces, and stacking the fiber segment pieces between the outer sleeves; The outer sleeve and the fiber segment piece are spliced together and simultaneously inserted into the inner sleeve to achieve splicing of the outer sleeve, the fiber segment piece and the inner sleeve; The outer sleeve, the fiber segment sheet and the inner sleeve are made into a preform rod, the preform rod is placed in a metal sleeve, and the metal sleeve is placed in a 200° C. graphite furnace of a drawing tower for vacuuming and heating; Applying pressure in the upper and lower directions of the preform rod to cause a bonding reaction between the components of the preform rod; After the bonding reaction is completed, the metal sleeve is removed, and the preform rods bonded into an integrated structure are drawn through the drawing tower to form the bamboo-shaped hollow-core optical fiber.

6. The method for preparing a bamboo-shaped hollow-core optical fiber according to claim 5, wherein: The outer sleeve and the fiber segment piece are spliced together and simultaneously inserted into the inner sleeve to achieve splicing of the outer sleeve, the fiber segment piece and the inner sleeve. The specific process includes: The outer sleeve and the fiber segment sheet are connected by means of matching adapters and adapter slots, and the adapter passes through the through hole provided on the upper edge of the fiber segment sheet to achieve the splicing of the outer sleeve and the fiber segment sheet; The inner sleeve passes through the string holes provided at the inner edge of the fiber segment piece layer by layer to achieve splicing of the inner sleeve and the fiber segment piece.

7. A processing device for bamboo-shaped hollow-core optical fiber, characterized in that: The method for preparing the bamboo-shaped hollow-core optical fiber according to claim 5 or 6 is characterized in that it comprises: a box body, a blocking component and a tightening component; The metal sleeve is installed in the box body, the blocking component is arranged at the bottom of the box body, and the tightening component is arranged at the top of the box body; A preform rod formed by splicing the outer sleeve, the fiber segment sheet and the inner sleeve is installed in the metal sleeve, and the blocking assembly and the tightening assembly can clamp the preform rod in the metal sleeve; During the bonding reaction process, a preset pressure can be applied to the preform rod in the up and down directions through the blocking assembly and the pressing assembly.

8. The processing equipment for bamboo hollow core optical fiber according to claim 7, characterized in that: The blocking assembly includes a flat plate, a rotating ring, a guide gear, a blade plate, a driving gear, an upper shell, a limiting plate and a limiting movable groove; A through hole is formed in the center of the plate, the rotating ring is located on the outer ring of the through hole and is rotatably connected to the plate, and four evenly distributed internal teeth are provided on the inner wall of the rotating ring, and the internal teeth are meshed with the guide gear; The guide gear is rotatably connected to the flat plate and is integrally connected to the fan blade. The fan blade can be closed or expanded synchronously with the rotation of the guide gear. When one end of the fan blade is in a closed state, the through hole can be blocked. The outer wall of the rotating ring is provided with external teeth, the external teeth are meshed and connected with the driving gear, and the driving gear is fixedly mounted on the side wall of the flat plate through a connecting seat; The upper shell fixing cover is arranged above the flat plate, the limiting movable groove is arranged inside the upper shell, and the limiting plate is fixed in the limiting movable groove above the rotating ring.

9. The processing equipment for bamboo hollow core optical fiber according to claim 8, characterized in that: An inner plywood is provided inside the metal sleeve, and the inner plywood fits inside the metal sleeve; The tightening assembly includes a guide rod, a first baffle, a second baffle, a spring, a push plate, a slide seat, a slide rail, a movable rod, a threaded cap and a bidirectional threaded drive screw, one end of the guide rod passes through the metal sleeve and is connected to the inner plywood, and the other end is connected to the first baffle and the second baffle; The spring and the push plate are both sleeved on the guide rod and arranged between the first baffle and the second baffle. One end of the spring is placed on the first baffle, and the other end is placed on the push plate. The push plate and the guide rod maintain relative sliding. The movable rod is hingedly connected to both end edges of the push plate, and both end portions of the push plate are arranged on the slide rails arranged on the inner wall of the box through the slide seats; The other end of the movable rod is hinged to the threaded caps provided at both ends of the bidirectional threaded drive screw respectively, and the bidirectional threaded drive screw is rotatably provided inside the box.

10. The processing equipment for bamboo hollow core optical fiber according to claim 9, characterized in that: The driving gear can drive the rotating ring to rotate, and the rotating ring drives the guide gear and the blade plate to rotate synchronously. The blade plate can be gathered inward and closed to block the through hole to prevent the preform rod from falling out of the metal sleeve; The rotation of the bidirectional threaded drive screw can drive the movable rod and the push plate to move, and the push plate drives the compression spring to apply force to the inner layer plywood. The prefabricated plate opens the fan blade plate under the clamping and fixation of the inner layer plywood, so that the prefabricated plate can be suspended and fixed inside the metal sleeve.

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