Spring butterfly-shaped optical cable and preparation method thereof

Abstract

The invention discloses a spring butterfly-shaped optical cable and a preparation method thereof, and belongs to the technical field of optical cables, the spring butterfly-shaped optical cable comprises an optical fiber unit, a sleeve arranged at the periphery of the optical fiber unit and an outer sheath arranged outside the sleeve, and the outer sheath is prepared from thermoplastic polyurethane, thermoplastic polyester elastomer, thermoplastic styrene elastomer, rubber or polyamide; and the anti-bending part is arranged on one side of the extension direction of the outer sheath. According to the spring butterfly-shaped optical cable disclosed by the invention, the outer sheath is prepared from the elastic material to form the spring-shaped optical cable, so that the optical cable can be automatically wound, and the optical cable can be conveniently arranged indoors; the anti-bending portion is arranged on one side of the outer sheath, and the bending side of the spring butterfly-shaped optical cable is supported through the anti-bending portion, so that the spring butterfly-shaped optical cable keeps a large bending radian, large bending strength is provided when the bending radius is small, and optical fiber attenuation or loss caused by further bending of the optical cable is avoided. And normal use of the spring butterfly-shaped optical cable is ensured.

Description

Technical Field

[0001] The present invention belongs to the technical field of optical cables, and in particular relates to a spring butterfly-shaped optical cable and a preparation method thereof. Background Art

[0002] With the advancement of technology and society, the application of optical cables is becoming increasingly widespread. Optical cables are not only used for long-distance optical communication transmission, but also need to transmit signals to office equipment in various buildings. Building office equipment primarily uses butterfly-shaped optical cables to connect to routers, switches, and other devices. The butterfly-shaped cables are compact and have good bending properties, making them easy to pass through door cracks, wall troughs, and other narrow spaces, reducing the overall difficulty of indoor optical cable routing.

[0003] During construction, sufficient length of butterfly cables is usually reserved at the connection port to ensure they can accurately connect to various communication devices. However, when there are devices indoors that require multiple direct fiber optic cables, the cables can easily become tangled, making it difficult to store and arrange the cable terminals indoors. Summary of the Invention

[0004] In response to one or more of the above-mentioned defects or improvement needs of the prior art, the present invention provides a spring butterfly optical cable to solve the problem that the existing butterfly optical cable is inconvenient to arrange and arrange after indoor construction and connection.

[0005] To achieve the above object, the present invention provides a spring butterfly optical cable, comprising: Fiber optic unit; a sleeve, the sleeve being sleeved on the outer periphery of the optical fiber unit; An outer sheath, which is sleeved on the outer circumference of the sleeve and is made of thermoplastic polyurethane, thermoplastic polyester elastomer, thermoplastic styrene elastomer, rubber or polyamide; an anti-bending portion, the anti-bending portion being provided on one side of the extending direction of the outer sheath; The spring butterfly-shaped optical cable is arranged in a spiral coil, and the spiral coiling radius of the spring butterfly-shaped optical cable is 50mm~500mm; the minimum bending radius of the spring butterfly-shaped optical cable is not less than 30mm, and the bending stiffness of the anti-bending part at a bending radius of 30mm is not less than 12000 N·mm.

[0006] As a further improvement of the present invention, the anti-bending portion is a strip structure, the anti-bending portion is arranged at the minimum bending radius of the outer sheath, and the anti-bending portion is made of fluororubber-modified carbon aerogel or liquid crystal polymer.

[0007] As a further improvement of the present invention, the anti-bending portion is a strip structure, the anti-bending portion is arranged at the maximum bending radius of the outer sheath, and the anti-bending portion is one of liquid crystal polymer, functionally gradient carbon nanotube reinforced composite material, and fluororubber modified liquid crystal polymer.

[0008] As a further improvement of the present invention, the anti-bending part includes a first anti-bending component and a second anti-bending component, the first anti-bending component is arranged at the minimum bending radius of the outer sheath, and the second anti-bending component is arranged at the maximum bending radius of the outer sheath, the first anti-bending component is fluororubber-modified carbon aerogel or liquid crystal polymer, and the second anti-bending component is liquid crystal polymer, functionally gradient carbon nanotube reinforced composite material or fluororubber-modified liquid crystal polymer.

[0009] As a further improvement of the present invention, there are multiple anti-bending parts, and multiple first anti-bending components and multiple second anti-bending components are distributed on the periphery of the outer sheath.

[0010] As a further improvement of the present invention, the optical fiber unit is a bend-insensitive optical fiber.

[0011] As a further improvement of the present invention, there are multiple optical fiber units, and the multiple optical fiber units are twisted and arranged.

[0012] As a further improvement of the present invention, an elastic material is filled between the optical fiber unit and the sleeve, and the elastic material is doped with water-blocking powder.

[0013] As a further improvement of the present invention, at least one aramid rope is embedded in the outer sheath.

[0014] The present invention also includes a method for preparing a spring butterfly-shaped optical cable, which comprises the following steps: S1, pulling the optical fiber unit and inserting the optical fiber unit into the casing; S2. Extruding an outer sheath on the outer periphery of the casing, reserving a notch for the anti-bending portion on one axial side of the outer sheath, and cooling the outer sheath into shape; S3, curing and bonding the anti-bending portion to the notch of the outer sheath to obtain a straight optical cable; S4, curling the straight optical cable into shape, heating the curled optical cable, keeping it warm for a set time, and then cooling the optical cable to obtain a spring butterfly-shaped optical cable.

[0015] As a further improvement of the present invention, in step S4, the straight optical cable is wound into shape by a winding machine, the winding radius of the optical cable is 50mm~500mm, the heating temperature of the curled optical cable is 80~150℃, the heating and insulation time is 60~80min, and the cooling is water cooling or air cooling.

[0016] As a further improvement of the present invention, in step S2, the outer sheath extrusion die needs to be adjusted so that an anti-bending area is reserved on the extruded outer sheath.

[0017] As a further improvement of the present invention, in step S3, the anti-bending portion and the outer sheath are bonded with hot melt adhesive or light curing adhesive, and after bonding, a rolling device is used to extrude the bonding area between the anti-bending portion and the outer sheath.

[0018] The present invention also includes an optical fiber jumper, which includes the spring butterfly-shaped optical cable, and LC / SC connectors are respectively connected to both ends of the spring butterfly-shaped optical cable.

[0019] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0020] In general, the above technical solutions conceived by the present invention have the following beneficial effects compared with the prior art: (1) The spring butterfly optical cable of the present invention adopts thermoplastic polyurethane, thermoplastic polyester elastomer, thermoplastic styrene elastomer, rubber or polyamide to prepare the outer sheath, so that the outer sheath has secondary plasticity and elasticity, so that the formed spring butterfly optical cable can be formed into a spring shape. When the spring butterfly optical cable is used for indoor layout, after the spring butterfly optical cable completes the connection between optical communication equipment, the excess part of the optical cable can be automatically rolled into a spring shape, avoiding the optical cable from being scattered everywhere, and facilitating the arrangement of the optical cable indoors; on the other hand, the spring butterfly optical cable of the present invention is provided with an anti-bending part on one side of the outer sheath, and the anti-bending part supports the bending side of the spring butterfly optical cable, so that the spring butterfly optical cable maintains a larger bending arc and provides greater bending strength at a smaller bending radius, avoiding further bending of the optical cable to cause optical fiber attenuation or loss, and ensuring the normal use of the spring butterfly optical cable.

[0021] (2) The spring butterfly optical cable of the present invention utilizes the anti-bending and extrusion properties of fluororubber-modified carbon aerogel or liquid crystal polymer on the inner side of the outer sheath bend, and the anti-bending and tensile properties of liquid crystal polymer, functionally gradient carbon nanotube reinforced composite material or fluororubber-modified liquid crystal polymer on the outer side of the outer sheath bend, thereby suppressing the bending of the outer sheath, ensuring that the optical cable is within a reasonable bending range, and reducing the damage and signal attenuation problems of the optical fiber unit caused by bending.

[0022] (3) The spring butterfly-shaped optical cable of the present invention forms an anti-bending structure in all directions of the optical cable by arranging multiple anti-bending parts on the outer sheath, thereby avoiding the problem of bending damage to the optical fiber unit when the optical cable goes around a large-angle bending area such as a wall corner.

[0023] (4) The spring butterfly optical cable of the present invention reduces the loss of the optical fiber unit caused by external pressure by twisting the internal optical fiber unit and filling elastic material between the optical fiber unit and the sleeve, thereby improving the service life of the spring butterfly optical cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 1 is a schematic cross-sectional view of a spring butterfly optical cable according to an embodiment of the present invention; Figure 2 1 is a schematic cross-sectional view of a spring butterfly optical cable according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of a spring butterfly-shaped optical cable in a straight state in an embodiment of the present invention; Figure 4 Schematic diagram of the anti-bending force of the first anti-bending component and the second anti-bending component when the spring butterfly-shaped optical cable is bent and stressed in an embodiment of the present invention; Figure 5 2 is a schematic structural diagram of a spring butterfly optical cable according to an embodiment of the present invention; Figure 6 1 is a flow chart of a method for preparing a spring butterfly-shaped optical cable according to an embodiment of the present invention.

[0025] In all the drawings, the same reference numerals represent the same technical features, specifically: 1. Optical fiber unit; 2. Sleeve; 3. Outer sheath; 4. First bending-resistant component; 5. Second bending-resistant component; 6. Aramid rope. DETAILED DESCRIPTION

[0026] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only intended to illustrate the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

[0027] In the description of the present invention, it should be understood that, unless otherwise specified, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present invention.

[0028] Furthermore, unless otherwise specified, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specified.

[0029] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0030] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0031] Example: See also Figures 1 to 6 The spring butterfly optical cable in a preferred embodiment of the present invention includes an optical fiber unit 1, with a sleeve 2 provided on the outside of the optical fiber unit 1; and an outer sheath 3, which is provided on the outer periphery of the sleeve 2 and is made of thermoplastic polyurethane, thermoplastic polyester elastomer, thermoplastic styrene elastomer, rubber, or polyamide. Furthermore, an anti-bending portion is provided on one side of the outer sheath 3 in the direction in which it extends. The spring butterfly optical cable in the present invention is arranged in a spiral coil, and the spiral coiling radius of the spring butterfly optical cable is 50 mm to 500 mm. The minimum bending radius of the spring butterfly optical cable is not less than 30 mm, and the bending stiffness of the anti-bending portion at a bending radius of 30 mm is not less than 12,000 N·mm.

[0032] The spring butterfly-shaped optical cable in the present invention adopts thermoplastic polyurethane, thermoplastic polyester elastomer, thermoplastic styrene elastomer, rubber or polyamide to prepare the outer sheath 3, so that the outer sheath 3 has secondary plasticity and elasticity, so that the molded spring butterfly-shaped optical cable can be formed into a spring shape. When the spring butterfly-shaped optical cable is used for indoor layout, after the spring butterfly-shaped optical cable completes the connection between optical communication equipment, the excess part of the optical cable can be automatically rolled into a spring shape, avoiding the optical cable from being scattered everywhere, and facilitating the arrangement of the optical cable indoors; on the other hand, the spring butterfly-shaped optical cable in the present invention is provided with an anti-bending part on one side of the outer sheath 3, and the bending side of the spring butterfly-shaped optical cable is supported by the anti-bending part, so that the spring butterfly-shaped optical cable maintains a larger bending arc and provides greater bending strength at a smaller bending radius, avoiding further bending of the optical cable to cause optical fiber attenuation or loss, thereby ensuring the normal use of the spring butterfly-shaped optical cable.

[0033] It is worth noting that the spiral coiling radius of the spring butterfly optical cable in the present invention is 50 mm to 500 mm, preferably 100 mm, 150 mm, 200 mm, or 300 mm. The spiral coiling radius of the spring butterfly optical cable is much larger than the minimum bending radius of the spring butterfly optical cable. This ensures that the bending state of the optical fiber unit 1 will not cause substantial damage to the spring butterfly optical cable when the spring butterfly optical cable is in a normal bending state, thereby ensuring the long-term and effective use of the spring butterfly optical cable. Of course, as an option, in actual use, the spiral coiling radius of the spring butterfly optical cable can also be greater than 500 mm.

[0034] Furthermore, as an optional embodiment of the present invention, the anti-bending portion in the present invention is a strip-shaped structure, which is arranged at the minimum bending radius of the outer sheath 3 and is made of fluororubber-modified carbon aerogel or liquid crystal polymer. When the anti-bending portion made of fluororubber-modified carbon aerogel is subjected to bending pressure, the carbon aerogel skeleton can provide strength and rigidity to resist external pressure; the anti-bending portion made of liquid crystal polymer requires molecular orientation design so that the anti-bending portion has high bending strength and tensile strength in the bending direction. The minimum bending radius of the outer sheath 3 is the inner side of the bend of the outer sheath 3. When the optical cable is further bent under force, the anti-bending force is provided by the anti-bending portion on the inner side of the bend of the outer sheath 3 to prevent further bending of the optical cable, thereby preventing damage to the optical fiber unit 1 or signal attenuation.

[0035] Furthermore, as an optional embodiment of the present invention, the anti-bending portion of the present invention is a strip-shaped structure, and the anti-bending portion is arranged at the maximum bending radius of the outer sheath 3. The anti-bending portion is made of one of liquid crystal polymer, functionally gradient carbon nanotube reinforced composite material, or fluororubber modified liquid crystal polymer. The carbon nanotubes in the functionally gradient carbon nanotube reinforced composite material can give the anti-bending portion a higher modulus, which can resist bending stress and form a pulling force on the outer side of the outer sheath 3 to prevent further bending of the outer sheath 3. It is worth noting that when the functionally gradient carbon nanotube reinforced composite material is used as the anti-bending portion, the carbon nanotube content on the side away from the outer sheath 3 is higher than the carbon nanotube content on the side close to the outer sheath 3, and the anti-bending portion as a whole forms a hard outer and soft inner anti-bending tensile structure; the liquid crystal polymer in the fluororubber modified liquid crystal polymer provides a rigid skeleton to prevent further bending and stretching of the outer sheath 3, and the fluororubber can absorb bending energy through molecular chain slippage, preventing the anti-bending portion from breaking. The maximum bending radius of the outer sheath 3 is the outer side of the outer sheath 3. When the optical cable is further bent and stressed, the anti-bending part can pull the outer sheath 3 to prevent the outer sheath 3 from further bending, thereby preventing damage to the optical fiber unit 1 or signal attenuation.

[0036] Furthermore, as an optional embodiment of the present invention, the bend-resistant portion of the present invention further includes a first bend-resistant component 4 and a second bend-resistant component 5, wherein the first bend-resistant component 4 is arranged at the minimum bend radius of the outer sheath 3, and the second bend-resistant component 5 is arranged at the maximum bend radius of the outer sheath 3. The first bend-resistant component 4 is made of fluororubber-modified carbon aerogel or liquid crystal polymer, and the second bend-resistant component 5 is made of liquid crystal polymer, functionally gradient carbon nanotube-reinforced composite material, or fluororubber-modified liquid crystal polymer. By providing a bend-resistant support structure on the inner side of the bend of the outer sheath 3 and a bend-pulling structure on the outer side of the bend of the outer sheath 3, the bending of the outer sheath 3 is suppressed, ensuring that the optical cable is within a reasonable bending range, and reducing the damage and signal attenuation caused by bending of the optical fiber unit 1.

[0037] Furthermore, as an optional embodiment of the present invention, the present invention includes multiple anti-bending portions, with multiple first anti-bending components 4 and multiple second anti-bending components 5 distributed around the outer circumference of the outer sheath 3. In a spring butterfly-shaped optical cable, bending damage to the optical fiber unit 1 occurs primarily in the radial direction of the winding direction. However, when the spring butterfly-shaped optical cable is stretched and unfolded or wound around a construction corner, the cable may also bend in other directions. By providing multiple anti-bending portions, multiple anti-bending and anti-tension elements are formed around the circumference of the outer sheath 3, preventing bending damage to the optical fiber unit 1 during construction.

[0038] Furthermore, as an optional embodiment of the present invention, the optical fiber unit 1 is a bend-insensitive optical fiber. Bend-insensitive optical fiber can reduce the degree of bend damage and signal attenuation in spring-and-butterfly cables, thereby improving their operational stability and service life. The optical fiber unit 1 can utilize G.657.A1, G.657.A2, or G657.B3 optical fibers.

[0039] Furthermore, as an optional embodiment of the present invention, multiple optical fiber units 1 are provided, and these units 1 are twisted together. This twisting arrangement improves the overall bending performance of the optical fiber units 1, thereby avoiding bending stress concentration and increasing the service life of the optical fiber. It is worth noting that the multiple optical fiber units 1 are not twisted around a central strength member, thus avoiding the problem of the central strength member making the overall optical cable difficult to spirally form.

[0040] Furthermore, as an optional embodiment of the present invention, an elastic material is also filled between the optical fiber unit 1 and the sleeve 2. The elastic material acts as a buffer to absorb bending pressure transmitted to the optical fiber unit 1, further reducing the possibility of damage to the optical fiber unit 1. Furthermore, the elastic material is doped with water-blocking powder to ensure the water-blocking performance of the spring butterfly cable. The elastic material is a polyurethane elastomer or silicone rubber elastomer molded using light-curing technology, which facilitates the molding of the water-blocking powder within the elastic material.

[0041] Furthermore, as an optional embodiment of the present invention, at least one aramid rope 6 is embedded within the outer sheath 3. The aramid rope 6 embedded within the outer sheath 3 of the present invention exhibits good flexibility, which does not significantly affect the bending performance of the spring butterfly-shaped optical cable. Furthermore, the aramid rope 6 exhibits good tensile strength, thus providing the spring butterfly-shaped optical cable with excellent tensile strength and preventing damage to the optical fibers caused by excessive stretching during use. Preferably, there are multiple aramid ropes 6, and the multiple aramid ropes 6 are evenly distributed within the outer sheath 3.

[0042] Furthermore, with respect to the above-mentioned spring butterfly-shaped optical cable, the present invention also includes a method for preparing the spring butterfly-shaped optical cable, which comprises the following steps: S1, pulling the optical fiber unit 1, and inserting the optical fiber unit 1 into the casing 2; S2, extruding an outer sheath 3 on the outer periphery of the sleeve 2, reserving a notch for the anti-bending portion on one axial side of the outer sheath 3, and cooling the outer sheath 3 into shape; S3, curing and bonding the anti-bending portion to the notch of the outer sheath 3 to obtain a straight optical cable; S4, curling the straight optical cable into shape, heating the curled optical cable, keeping it warm for a set time, and then cooling the optical cable to obtain a spring butterfly-shaped optical cable.

[0043] Furthermore, as an optional embodiment of the present invention, in step S4, the straight optical cable is wound into shape using a winding machine, the winding radius of the optical cable is 50~500mm, the heating temperature of the curled optical cable is 80~150℃, the heating and insulation time is 60~80min, and the cooling is done by water cooling or air cooling.

[0044] Furthermore, as an optional embodiment of the present invention, in step S2, the extrusion die of the outer sheath 3 needs to be adjusted so that an anti-bending setting area is reserved on the extruded outer sheath 3. In step S3, the anti-bending part and the outer sheath 3 are bonded with hot melt adhesive or light-curing adhesive, and after bonding, a rolling device is used to extrude the anti-bending part and the bonding area of ​​the outer sheath 3 to ensure that the two are formed into one piece. The carbon aerogel structure in the fluororubber-modified carbon aerogel is fragile. If it is extruded together with the outer sheath 3, it is easy to cause the fluororubber-modified carbon aerogel to break directly, and it cannot provide anti-bending ability in the subsequent bending process; although liquid crystal polymers are suitable for extrusion processes, the anti-bending performance of liquid crystal polymers depends on the orientation of their molecular chains, which is not easy to control in the optical cable extrusion process; functionally gradient carbon nanotube reinforced composite materials need to form a structure with a high carbon nanotube content on the outer side and a low carbon nanotube content on the inner side on the outer sheath 3, which is also not easy to control during the extrusion process. Therefore, the present invention adopts a process similar to the color strips or labels in the optical cable, and forms the outer sheath 3 with the anti-bending part by embedding the anti-bending part into the outer sheath 3 for the second time.

[0045] Furthermore, as an optional embodiment of the present invention, the spring butterfly cable of the present invention is primarily suitable for connecting indoor fiber optic boxes and communication equipment. To facilitate the connection of the spring butterfly cable with the fiber optic box or communication equipment, the present invention also includes a fiber optic patch cord, which includes a spring butterfly cable and LC / SC connectors at both ends of the spring butterfly cable. The fiber optic patch cord of the present invention has a length of 0.5m, 1m, 2m, 5m, 10m, or 20m. Optionally, the length of the fiber optic patch cord can also be set to a set length according to usage requirements.

[0046] It will be easily understood by those skilled in the art that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A spring butterfly optical cable, characterized in that: include: Fiber optic unit; a sleeve, the sleeve being sleeved on the outer periphery of the optical fiber unit; An outer sheath, which is sleeved on the outer circumference of the sleeve and is made of thermoplastic polyurethane, thermoplastic polyester elastomer, thermoplastic styrene elastomer, rubber or polyamide; an anti-bending portion, the anti-bending portion being provided on one side of the extending direction of the outer sheath; The spring butterfly-shaped optical cable is arranged in a spiral coil, and the spiral coiling radius of the spring butterfly-shaped optical cable is 50mm~500mm; the minimum bending radius of the spring butterfly-shaped optical cable is not less than 30mm, and the bending stiffness of the anti-bending part at a bending radius of 30mm is not less than 12000 N·mm.

2. The spring butterfly optical cable according to claim 1, characterized in that: The anti-bending portion is a strip structure, is arranged at the minimum bending radius of the outer sheath, and is made of fluororubber-modified carbon aerogel or liquid crystal polymer.

3. The spring butterfly optical cable according to claim 1, characterized in that: The anti-bending portion is a strip structure, is arranged at the maximum bending radius of the outer sheath, and is made of one of liquid crystal polymer, functionally gradient carbon nanotube reinforced composite material, and fluororubber modified liquid crystal polymer.

4. The spring butterfly optical cable according to claim 1, characterized in that: The anti-bending part includes a first anti-bending component and a second anti-bending component. The first anti-bending component is arranged at the minimum bending radius of the outer sheath, and the second anti-bending component is arranged at the maximum bending radius of the outer sheath. The first anti-bending component is fluororubber-modified carbon aerogel or liquid crystal polymer, and the second anti-bending component is liquid crystal polymer, functionally gradient carbon nanotube reinforced composite material or fluororubber-modified liquid crystal polymer.

5. The spring butterfly optical cable according to claim 4, characterized in that: There are multiple anti-bending parts, and multiple first anti-bending components and multiple second anti-bending components are distributed on the periphery of the outer sheath.

6. The spring butterfly optical cable according to claim 1, characterized in that: The optical fiber unit is a bend-insensitive optical fiber.

7. The spring butterfly optical cable according to claim 1, characterized in that: There are a plurality of optical fiber units, and the plurality of optical fiber units are twisted and arranged.

8. The spring butterfly optical cable according to claim 1 or 7, characterized in that: An elastic material is filled between the optical fiber unit and the sleeve, and the elastic material is doped with water-blocking powder.

9. The spring butterfly optical cable according to claim 1, characterized in that: At least one aramid rope is embedded in the outer sheath.

10. A method for preparing a spring butterfly optical cable, for preparing the spring butterfly optical cable as claimed in any one of claims 1 to 8, characterized in that: The steps include: S1, pulling the optical fiber unit and inserting the optical fiber unit into the casing; S2. Extruding an outer sheath on the outer periphery of the casing, reserving a notch for a bending-resistant portion on one axial side of the outer sheath, and cooling the outer sheath into shape; S3, curing and bonding the anti-bending portion to the notch of the outer sheath to obtain a straight optical cable; S4, curling the straight optical cable into shape, heating the curled optical cable, keeping it warm for a set time, and then cooling the optical cable to obtain a spring butterfly-shaped optical cable.

Images