Bamboo joint type hollow-core optical fiber, preparation method and processing equipment

Abstract

The invention discloses a bamboo joint type hollow-core optical fiber, a preparation method and processing equipment, in the bamboo joint type hollow-core optical fiber, the bamboo joint type hollow-core optical fiber is provided with a preset number of sections of outer sleeves, a fiber section piece is arranged between every two adjacent sections of outer sleeves, the outer sleeves and the fiber section pieces are alternately overlapped, and a photonic band gap optical fiber is arranged in the middle of each fiber section piece; the inner sleeve penetrates through the inner edge parts of the fiber section pieces, so that the fiber section pieces between the outer sleeves are connected in series; the bamboo joint type hollow-core optical fiber is formed by performing heating and bonding reaction on the outer sleeve, the fiber joint sheets and the inner sleeve and then performing wire drawing. According to the technical scheme, the stability of signal transmission is improved, the optical fiber structure is simple, low loss is guaranteed, the preparation process is simple and practical, the hollow optical fiber can be stably prepared, the cost is low, large-scale manufacturing is supported, the automation degree of processing equipment is high, manpower can be effectively saved, and the production efficiency is improved. 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 elements, 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 is the abbreviation of optical fiber. The commonly used optical fiber structure is mainly composed of a core, a cladding, and a coating. Optical fiber has the characteristics of small mass, light weight, and anti-electromagnetic interference. In addition to being widely used in optical fiber communications, the most common use of optical fiber is to make a variety of devices and optical fiber sensors. The types of optical fibers include single-mode optical fiber, multi-mode optical fiber, polarization-maintaining optical fiber, multi-core optical fiber, hollow-core optical fiber, etc.

[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, which includes a core and a cladding. The core is an air hole, and a layer of air hole wall is formed at the junction of the core and the cladding. An anti-resonance ring is arranged 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, the light waves propagating in the core are reflected multiple times in the anti-resonance ring, thereby eliminating the light at the junction of the core and the cladding, effectively reducing the coupling of the surface mode and the core mode, and improving the 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 costly, but also requires the addition of anti-resonance rings, making the manufacturing process more cumbersome. Summary of the invention

[0005] In view of the above problems, the present invention provides a bamboo-section hollow-core optical fiber and a preparation method and processing equipment. Through the setting of the fiber section piece and the photonic bandgap optical fiber transmission mode designed in the middle part of the fiber section, light propagates from the hollow-core optical fiber and enters the fiber section piece 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 low loss is guaranteed. 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 mass 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-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.

[0010] In the above technical solution, preferably, a preset number of string holes are provided at the inner edge of the fiber segment sheet, and the inner sleeve connects the fiber segment sheets in series through the string holes.

[0011] In the above technical solution, preferably, 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, and the connectors pass through the through holes of the corresponding fiber segment sheets and are inserted into the connector slots to achieve connection between the outer sleeve and the fiber segment sheets.

[0012] In the above technical solution, preferably, 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.

[0013] The present invention also 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 one of the above technical solutions, comprising:

[0014] Selecting a preset number of outer sleeves and fiber segment pieces, and stacking and arranging the fiber segment pieces between the outer sleeves;

[0015] The outer sleeve and the fiber segment sheet are spliced ​​together and inserted into the inner sleeve at the same time, so as to realize the splicing of the outer sleeve, the fiber segment sheet and the inner sleeve;

[0016] 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;

[0017] Applying pressure in the up and down directions of the preform rod to cause bonding reaction between the components of the preform rod;

[0018] After the bonding reaction is completed, the metal sleeve is removed, and the preform rod bonded into an integrated structure is drawn through the drawing tower to form the bamboo-shaped hollow-core optical fiber.

[0019] In the above technical solution, preferably, the outer sleeve and the fiber segment sheet are spliced ​​and inserted into the inner sleeve at the same time to achieve the splicing of the outer sleeve, the fiber segment sheet and the inner sleeve, and the specific process includes:

[0020] The outer sleeve and the fiber segment sheet are plugged together through matching adapters and adapter slots, and the adapter passes through a through hole provided at an upper edge of the fiber segment sheet to achieve splicing of the outer sleeve and the fiber segment sheet;

[0021] The inner sleeve passes through the string holes arranged at the inner edge of the fiber segment piece layer by layer to achieve the splicing of the inner sleeve and the fiber segment piece.

[0022] The present invention also provides a bamboo-section hollow-core optical fiber processing device, which is applied to the preparation method of the bamboo-section hollow-core optical fiber disclosed in any one of the above technical solutions, comprising: a box body, a blocking component and a tightening 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 tightening component is arranged at the top of the box body;

[0024] The 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;

[0025] 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.

[0026] In the above technical solution, preferably, the blocking assembly includes a flat plate, a rotating ring, a guide gear, a fan blade plate, a driving gear, an upper shell, a limiting plate and a limiting movable groove;

[0027] A through hole is opened in the center of the plate, the rotating ring is located at the outer ring of the through hole and is rotatably connected to the plate, and four evenly distributed internal teeth are arranged on the inner wall of the ring body of the rotating ring, and the internal teeth are meshed with the guide gear;

[0028] The guide gear is rotatably connected to the flat plate and is integrally connected to the fan blade plate. The fan blade plate can be closed or unfolded synchronously with the rotation of the guide gear. When one end of the fan blade plate is in a closed state, the through hole can be blocked.

[0029] The outer wall of the ring body 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;

[0030] 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.

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

[0032] 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;

[0033] The spring and the push plate are both sleeved on the guide rod and arranged between the first baffle plate and the second baffle plate. One end of the spring is placed on the first baffle plate, and the other end is placed on the push plate. The push plate and the guide rod maintain relative sliding.

[0034] The movable rods are hingedly connected to the edges of both ends of the push plate, and the ends of both ends of the push plate are arranged on the slide rails arranged on the inner wall of the box body through the slide seats;

[0035] The other end of the movable rod is hinged to the threaded caps arranged at both ends of the bidirectional threaded driving screw rod, and the bidirectional threaded driving 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, and the rotating ring drives the guide gear and the fan blade to rotate synchronously, and the fan blade is gathered inwardly to block the through hole to prevent the preform rod from falling out of the metal sleeve;

[0037] 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 splint. The prefabricated plate opens the fan blade plate under the clamping of the inner layer splint, so that the prefabricated plate 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 segment and the photonic bandgap fiber transmission mode designed in the middle part of the fiber segment, light propagates from the hollow-core fiber and enters the fiber segment to be transmitted in the form of photonic bandgap fiber transmission, and then enters the hollow-core fiber, thereby improving the stability of signal transmission, and the fiber structure is simple and low loss is guaranteed. Moreover, the preparation process in conjunction with the bonding reaction is simple and practical, and the hollow-core fiber can be stably prepared, the cost is low, and mass production is supported. In addition, the processing equipment of the bamboo hollow-core fiber has a high degree of automation, can effectively save manpower, and improves processing efficiency and production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1A schematic diagram of the main structure of a bamboo-shaped hollow-core optical fiber disclosed in an embodiment of the present invention;

[0040] Figure 2 A schematic diagram of a front cross-sectional structure of an outer sleeve, a fiber segment, an inner sleeve and a photonic bandgap optical fiber placed in a metal sleeve according to an embodiment of the present invention;

[0041] Figure 3 A schematic diagram of the cross-sectional structure of a fiber segment sheet at a non-fiber segment sheet disclosed in an embodiment of the present invention;

[0042] Figure 4 A schematic diagram of the cross-sectional structure of a fiber segment sheet at a fiber segment sheet disclosed in an embodiment of the present invention;

[0043] Figure 5 A schematic diagram of the through holes and string holes structure on a fiber segment sheet disclosed in an embodiment of the present invention;

[0044] Figure 6 It is a schematic diagram of the main cross-sectional structure of an outer sleeve, a fiber segment sheet and an inner sleeve disclosed in an embodiment of the present invention;

[0045] Figure 7 It is a schematic diagram of the main cross-sectional structure of two adjacent outer sleeves disclosed in an embodiment of the present invention;

[0046] Figure 8 A schematic diagram of the structure of a drawing tower and a bamboo hollow-core optical fiber processing device disclosed in an embodiment of the present invention;

[0047] Fig. 9 A schematic diagram of the internal structure of a bamboo hollow core optical fiber processing device disclosed in an embodiment of the present invention;

[0048] Fig.10 A schematic diagram of a top view of a metal sleeve disclosed in an embodiment of the present invention;

[0049] Fig.11 A schematic diagram of the internal top view structure of a blocking assembly disclosed in an embodiment of the present invention;

[0050] Fig.12 The figure is a schematic diagram of the external top view structure of a blocking assembly 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. Connecting slot; 103. Inner sleeve; 2. Fiber segment; 201. Through hole; 202. String hole; 3. Photonic bandgap fiber; 4. Drawing tower; 5. Processing equipment; 501. Box; 6. Metal sleeve; 601. Inner plywood; 7. Guide rod; 701. First baffle; 702. Second baffle; 703. Spring; 704. Push plate; 705. Sliding seat; 706, sliding rail; 707, movable rod; 708, threaded cap; 709, bidirectional threaded drive screw; 8, blocking assembly; 801, flat plate; 802, upper shell; 803, driving gear; 804, connecting seat; 805, rotating ring; 806, internal teeth; 807, guide gear; 808, fan blade plate; 809, external teeth; 810, limit plate; 811, limit movable groove. DETAILED DESCRIPTION

[0053] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0054] The present invention is further described in detail below in conjunction with the accompanying drawings:

[0055] like Figures 1 to 7 As shown, a bamboo-type hollow-core optical fiber provided according to the present invention comprises an outer sleeve 1, a fiber segment piece 2 and an inner sleeve 103;

[0056] The bamboo-type hollow-core optical fiber is provided with a preset number of outer sleeves 1, a fiber segment 2 is provided between each two adjacent outer sleeves 1, the outer sleeves 1 and the fiber segment 2 are alternately stacked, and a photonic bandgap optical fiber 3 is provided in the middle of the fiber segment 2;

[0057] The inner sleeve 103 penetrates through the inner edge of the fiber segment pieces 2 to connect the fiber segment pieces 2 between the outer sleeves 1 in series;

[0058] The bamboo-type hollow-core optical fiber is formed by drawing an outer sleeve 1, a fiber segment 2 and an inner sleeve 103 after heating and bonding reaction.

[0059] In this embodiment, through the setting of the fiber segment piece 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 and enters the fiber segment piece 2 and is transmitted in the form of the photonic bandgap fiber 3, and then enters the hollow-core fiber, and so on and so forth, thereby improving the stability of signal transmission, and the optical fiber structure is simple and ensures low loss. Moreover, the preparation process in conjunction with the bonding reaction is simple and practical, and the hollow-core fiber can be stably prepared, with low cost, and supports mass production. In addition, the processing equipment 5 of the bamboo hollow-core fiber has a high degree of automation, can effectively save manpower, and improves 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 at the inner edge of the fiber segment piece 2 , and the inner sleeve 103 connects 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 connector slot 102, and the connector 101 passes through the through hole 201 of the corresponding fiber segment piece 2 and is inserted into the connector slot 102 to achieve 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 of the serially connected fiber segment sheet 2 is arranged along the inner edge of the outer sleeve 1 .

[0064] The present invention also 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 one 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] The outer sleeve 1 and the fiber segment piece 2 are spliced ​​and inserted into the inner sleeve 103 at the same time, so as to realize the 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 reaction between the components of the preform rod;

[0069] After the bonding reaction is completed, the metal sleeve 6 is removed, and the preformed rod bonded into an integrated structure is drawn through a drawing tower 4 to form a bamboo-shaped hollow-core optical fiber.

[0070] In this embodiment, the specific dimensions of the bamboo hollow core optical fiber can be processed as follows: the outer sleeve 1 has a diameter of 125um and a wall thickness of 10um; the inner sleeve 103 has a diameter of 31um or 28um and a wall thickness of 0.5um; the thickness of the fiber segment piece 22 in the preform rod is set to 10um, and the spacing between the fiber segment pieces 22 is set to 0.5mm, so that there is a fiber segment every 500m of the pulled optical fiber; after being drawn into an optical fiber, the thickness of the preform rod fiber segment piece 2 is 1m.

[0071] Specifically, during the drawing process, a pressure of twice the weight of the metal sleeve 6 is applied to the preform rod in the up and down directions, and then a gas pressure of 0.3-2MPa is applied to the optical fiber through the unclosed air holes at the end face of the photonic bandgap optical fiber 3, and then the optical fiber is subjected to the first heating treatment and the first stretching of the optical fiber, and the gas pressure applied to the optical fiber after the first stretching is reduced to 0.11-0.5MPa, and the optical fiber is subjected to the second heating treatment, and the second stretching is performed during the second heating process until a hollow-core online optical fiber micro-unit is formed. The stretching speed of the first stretching is 1.2 mm / min, and the stretching speed of the second stretching is 15 mm / min.

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

[0073] The outer sleeve 1 and the fiber segment piece 2 are plugged together through the matching adapter 101 and the adapter slot 102, and the adapter 101 passes through the through hole 201 provided on the upper edge of the fiber segment piece 2 to achieve the splicing of the outer sleeve 1 and the fiber segment piece 2;

[0074] The inner sleeve 103 passes through the string holes 202 provided at the inner edge of the fiber segment sheet 2 layer by layer, so as to realize the splicing of the inner sleeve 103 and the fiber segment sheet 2 .

[0075] In the above embodiment, each adjacent two sections of outer sleeves 1 are connected by a connector 101 and a connecting slot 102 to form a mortise and tenon structure. After the connector 101 passes through the through hole 201 of the fiber segment piece 2, it is inserted into the connecting slot 102 to splice the multiple sections of outer sleeves 1 and the fiber segment piece 2. During the implementation process, after the multiple sections of outer sleeves 1 and the fiber segment piece 2 are spliced, the inner sleeve 103 is inserted into the corresponding string hole 202; or, the outer sleeve 1 and the fiber segment piece 2 are inserted into the inner sleeve 103 while being spliced. The outer sleeve 1, the fiber segment piece 2 and the inner sleeve 103 are integrally spliced ​​to form a preform rod, and the preform rod is placed in a vacuum environment of a drawing tower 4 to be preheated and melted into one body, and finally drawn to form a bamboo-shaped hollow-core optical fiber.

[0076] like Figures 8 to 12 As shown, the present invention also provides a bamboo-shaped hollow-core optical fiber processing device, which is applied to the preparation method of the bamboo-shaped hollow-core optical fiber disclosed in any one of the above embodiments, comprising: a box body 501, a blocking component 8 and a tightening 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 tightening component is arranged at the top of the box body 501;

[0078] The preform rod formed by splicing the outer sleeve 1, the fiber segment sheet 2 and the inner sleeve 103 is installed in the metal sleeve 6, and the blocking assembly 8 and the tightening assembly can clamp the preform rod in the metal sleeve 6;

[0079] During the bonding reaction, a preset pressure can be applied to the preform in the up and down directions through the blocking assembly 8 and the pressing assembly.

[0080] In this embodiment, the metal sleeve 6 is fixedly arranged inside the box body 501, with the top penetrating the box body 501, and the bottom thereof is fixed to the bottom wall of the metal box body 501 through the blocking assembly 8. When the opening of the blocking assembly 8 is opened, the preform is suspended and fixed inside the metal sleeve 6, so that pressure can be added to the metal sleeve 6 in the up and down directions.

[0081] In the above embodiment, preferably, the blocking assembly 8 includes a flat plate 801, a rotating ring 805, a guide gear 807, a blade plate 808, a driving gear 803, an upper shell 802, a limiting plate 810 and a limiting movable groove 811;

[0082] A through hole is provided at the center of the plate 801, and a rotating ring 805 is located at the outer ring of the through hole and is rotatably connected to the plate 801. Four evenly distributed inner teeth 806 are provided on the inner wall of the rotating ring 805, and the inner teeth 806 are meshed with the guide gear 807.

[0083] The guide 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 closed or unfolded synchronously with the rotation of the guide gear 807. When one end of the fan blade plate 808 is in a closed state, the through hole can be blocked.

[0084] The outer wall of the rotating ring 805 is provided with external teeth 809, which are meshed with the driving gear 803, and the driving gear 803 is fixedly mounted 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 movable groove 811 is provided inside the upper shell 802 . The limiting plate 810 is fixed in the limiting movable groove 811 above the rotating ring 805 .

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

[0087] The tightening assembly includes a guide rod 7, a first baffle 701, a second baffle 702, a spring 703, a push plate 704, a slide seat 705, a slide rail 706, a movable rod 707, a threaded cap 708 and a bidirectional threaded drive screw 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] The spring 703 and the push plate 704 are both sleeved on the guide rod 7 and arranged between the first baffle 701 and the second baffle 702. One end of the spring 703 is placed on the first baffle 701, and the other end is placed on the push plate 704. The push plate 704 and the guide rod 7 maintain relative sliding.

[0089] The two end edges of the push plate 704 are hinged with movable rods 707, and the two end portions of the push plate 704 are arranged on the slide rails 706 arranged on the inner wall of the box body 501 through the slide seats 705;

[0090] The other end of the movable rod 707 is hinged to the threaded caps 708 provided at both ends of the bidirectional threaded driving screw 709 , and the bidirectional threaded driving screw 709 is rotatably provided inside the box body 501 .

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

[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 a force on the first baffle plate 701 on the one hand, and generate a force on the push plate 704 on the other hand. Therefore, the guide rod 7 is subjected to force together with the first baffle plate 701, and can exert a force on the inner layer splint 601. When the preform rod is placed in 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, and the blade plate 808 gathers inward and closes to block the through hole to prevent 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. The push plate 704 drives the compression spring 703 to apply a force to the inner layer splint 601. The prefabricated plate opens the fan blade plate 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 the implementation, when the bidirectional threaded drive screw 709 rotates, the threaded caps 708 at both ends can move closer to or farther from each other, so that the threaded caps 708 can drive the movable rod 707 and the push plate 704 to move. When the preform is put into the metal sleeve 6, the driving gear 803 first drives the rotating ring 805 to rotate, and the rotating ring 805 drives the guide gear 807 and the four blade plates 808 to rotate synchronously. When the blade plates 808 gather inward and close, they can block the through hole to prevent the preform from falling out of the metal sleeve 6.

[0096] Then, the screw rod 709 is driven to rotate by the bidirectional threaded drive screw rod 709, 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, and the spring 703 will generate elastic force, which can apply a force to the inner layer clamping plate 601. The preform rod can be clamped and fixed by the inner layer clamping plate 601. Finally, the fan blade plate 808 is opened to allow the preform rod to be 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 only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A bamboo hollow core optical fiber, characterized in that: It includes an outer sleeve, a fiber segment sheet 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 arranged at the inner edge of the fiber segment sheet, and the inner sleeve is used to string the fiber segment sheets together through the string holes.

3. The bamboo hollow core optical fiber according to claim 1, characterized in that: The edge of the fiber segment sheet is provided with a preset number of through holes, and the outer sleeves of each two adjacent segments are provided with matching connectors and connector slots, and 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 as claimed in any one of claims 1 to 4, comprising: Selecting a preset number of outer sleeves and fiber segment pieces, and stacking and arranging the fiber segment pieces between the outer sleeves; The outer sleeve and the fiber segment sheet are spliced ​​together and inserted into the inner sleeve at the same time, so as to realize the splicing of the outer sleeve, the fiber segment sheet 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 up and down directions of the preform rod to cause bonding reaction between the components of the preform rod; After the bonding reaction is completed, the metal sleeve is removed, and the preform rod bonded into an integrated structure is drawn through the drawing tower to form the bamboo-shaped hollow-core optical fiber.

6. The method for preparing the bamboo hollow core optical fiber according to claim 5, characterized in that: The outer sleeve and the fiber segment piece are spliced ​​and inserted into the inner sleeve at the same time, so as to realize the 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 plugged together through matching adapters and adapter slots, and the adapter passes through a through hole provided at an upper edge of the fiber segment sheet to achieve splicing of the outer sleeve and the fiber segment sheet; The inner sleeve passes through the string holes arranged at the inner edge of the fiber segment piece layer by layer to achieve the splicing of the inner sleeve and the fiber segment piece.

7. A bamboo hollow core optical fiber processing device, characterized in that: The method for preparing the bamboo hollow core optical fiber as claimed in 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; The 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 fan blade plate, a driving gear, an upper shell, a limiting plate and a limiting movable groove; A through hole is opened in the center of the plate, the rotating ring is located at the outer ring of the through hole and is rotatably connected to the plate, and four evenly distributed internal teeth are arranged on the inner wall of the ring body 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 plate. The fan blade plate can be closed or unfolded synchronously with the rotation of the guide gear. When one end of the fan blade plate is in a closed state, the through hole can be blocked. The outer wall of the ring body 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 7, characterized in that: An inner layer plywood is arranged inside the metal sleeve, and the inner layer 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 plate and the second baffle plate. One end of the spring is placed on the first baffle plate, and the other end is placed on the push plate. The push plate and the guide rod maintain relative sliding. The movable rods are hingedly connected to the edges of both ends of the push plate, and the ends of both ends of the push plate are arranged on the slide rails arranged on the inner wall of the box body through the slide seats; The other end of the movable rod is hinged to the threaded caps arranged at both ends of the bidirectional threaded driving screw rod, and the bidirectional threaded driving screw rod is rotatably arranged inside the box body.

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 fan blade to rotate synchronously, and the fan blade can close inward 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 splint. The prefabricated plate opens the fan blade plate under the clamping of the inner layer splint, so that the prefabricated plate can be suspended and fixed inside the metal sleeve.

Images