Invisible double-core butterfly-shaped optical cable easy to construct

Abstract

The invention belongs to the field of optical communication transmission, and particularly discloses an invisible easy-to-construct double-core butterfly-shaped optical cable which comprises a cable core, and the cable core comprises two optical fibers arranged in parallel at intervals and an inner sheath wrapping the two optical fibers; a mounting cavity for mounting the inner sheath is formed in the outer sheath along the axis extension direction of the outer sheath; the outer peripheral surface of the outer sheath is provided with a cable opening groove which is arranged along the extension direction of the axis of the outer sheath. A separation groove communicated with the mounting cavity is formed in the outer sheath in the axis extending direction of the outer sheath, and the cable opening groove extends towards the axis of the outer sheath in the radial direction of the outer sheath so as to be communicated with the separation groove. The outer sheath of the double-core butterfly-shaped optical cable is provided with the cable opening groove, the cable opening groove is cut by a blade, and the cable opening groove is communicated with the separation groove after being opened, so that the outer sheath is conveniently opened, separation of the inner sheath and the outer sheath is realized, the depth of the blade entering the outer sheath can be reduced, the blade does not contact with the inner sheath outside the optical fiber, and the service life of the optical fiber is prolonged. And the inner sheath can be prevented from being damaged.

Description

Technical Field

[0001] The present application belongs to the field of optical communication transmission, and more specifically, to an invisible and easy-to-construct dual-core butterfly optical cable. Background Art

[0002] With the rapid development of the information age, the introduction of optical cables plays a vital role in the fiber-to-the-home Internet transmission system. The most commonly used introduction optical cables are single-core optical cables, that is, there is only one optical fiber in the optical cable as a signal transmission unit. However, with the continuous expansion of the application field of fiber-to-the-home, the Internet is spread over a wider range, more signals need to be transmitted, and the line laying is more complicated. Single-core introduction optical cables are no longer suitable for actual use and laying requirements. In many cases, the wiring of optical cables requires two points to be wired at the same time, or one point is used and one is used as a backup. Therefore, it is necessary to use dual-core introduction optical cables for laying to meet the needs of communication transmission.

[0003] Existing dual-core lead-in optical cables usually include two optical fibers, an inner sheath that is sleeved outside the two optical fibers for simultaneously protecting the optical fibers, and an outer sheath that is covered outside the inner sheath. When the dual-core lead-in optical cable is laid and used, it is usually necessary to cut the outer sheath to separate the inner sheath and the outer sheath, so that the optical fiber in the inner sheath can be leaked out for laying and connection. Operators usually use a blade to cut the outer sheath to leak out the inner sheath before laying and connecting the optical fiber. However, when this method is used in practice, the blade cutting the outer sheath is likely to scratch the inner sheath, thereby affecting the protective effect of the inner sheath on the optical fiber, making the optical fiber easily damaged and affecting its signal transmission. Summary of the invention

[0004] In view of the defects of the prior art, the present application provides an invisible and easy-to-construct dual-core butterfly optical cable, which aims to solve the problem that the existing dual-core introduction optical cable uses a blade to separate the outer sheath and the inner sheath when in use, which easily causes damage to the inner sheath and affects its protection effect on the optical fiber.

[0005] The present application provides an invisible and easy-to-construct dual-core butterfly optical cable, which specifically includes: A cable core, the cable core comprising two optical fibers arranged in parallel and spaced apart from each other, and an inner sheath covering the two optical fibers and constraining the two optical fibers; An outer sheath, wherein an installation cavity for installing the inner sheath is provided inside the outer sheath along the extension direction of its axis, and the outer sheath covers and fits the outside of the inner sheath; a cable groove is provided on the outer peripheral surface of the outer sheath along the extension direction of its axis; a separation groove connected with the installation cavity is provided inside the outer sheath along the extension direction of its axis, and after the cable groove is opened, it can extend along the radial direction of the outer sheath toward its axis to achieve communication with the separation groove.

[0006] Through the above technical scheme conceived by the present application, compared with the prior art, since the invisible and easy-to-construct dual-core butterfly optical cable of the present application is provided with a cable groove, the cable groove can be connected with the separation groove after extending radially along the outer sheath toward its axis. When separating the inner sheath and the outer sheath of the dual-core butterfly optical cable, a blade is used to cut the cable groove, and the cable groove is connected with the separation groove after opening, so as to open the outer sheath, thereby realizing the separation of the inner sheath and the outer sheath. This method reduces the depth of the blade entering the outer sheath, and the blade will not contact the inner sheath outside the optical fiber, which can achieve the beneficial effect of avoiding damage to the inner sheath and affecting its protection of the optical fiber. At the same time, the separation is more convenient, the wiring and laying are convenient, and the construction process is simple.

[0007] As further preferred, the cross section of the cable opening groove along the direction perpendicular to the axis of the outer sheath is V-shaped, and the V-shaped opening faces the outer peripheral surface of the outer sheath.

[0008] By adopting the above technical solution, the cable groove has a V-shaped structure, which is convenient for cutting and extending it with a blade to accurately connect it with the separation groove, avoiding deviation of the blade cutting angle.

[0009] As a further preference, two of the cable opening grooves and separation grooves are provided, the two separation grooves are respectively located on both sides of the inner sheath, and the two cable opening grooves are symmetrically arranged on both sides of the outer sheath and correspond to the two separation grooves.

[0010] By adopting the above technical solution, after opening the cable grooves on both sides of the outer sheath, they can be connected to the corresponding separation grooves respectively, and the outer sheath can be divided into two halves more evenly to facilitate the separation of the two optical fibers, making the operation more convenient and reducing the difficulty of operation.

[0011] As a further preference, the cross section of the inner sheath along a direction perpendicular to the axis of the outer sheath is in an 8-shape and is an integrally formed structure, and one end of the separation groove is located in a recessed portion of the inner sheath.

[0012] By adopting the above technical solution, the recessed portion of the inner sheath can squeeze and fix one end of the separation groove, thereby avoiding the reduction in stability of the invisible and easy-to-construct dual-core butterfly optical cable caused by the setting of the separation groove.

[0013] As further preferred, the 8-shaped inner sheath comprises an upper semicircular portion and a lower semicircular portion, and the outer diameters of the upper semicircular portion and the lower semicircular portion are different.

[0014] By adopting the above technical solution, since the outer diameters of the upper semicircular part and the lower semicircular part of the inner sheath are different, the two optical fibers can be easily distinguished and identified according to the cross-sectional thickness of the inner sheath, and then the two optical fibers can be accurately connected to the line respectively, avoiding the need for reconnection after connection errors in actual operations, which affects the operation efficiency.

[0015] As a further preference, the invisible and easy-to-construct dual-core butterfly optical cable further comprises at least two parallel and spaced reinforcement members, the reinforcement members are respectively located on both sides of the inner sheath, and the reinforcement members are arranged along the axial extension direction of the outer sheath.

[0016] By adopting the above technical solution, the reinforcement member can improve the overall strength of the invisible and easy-to-construct dual-core butterfly optical cable, while improving the tensile performance, so that it has short-distance overhead performance and can be suitable for laying in a variety of environments.

[0017] As further preferred, the reinforcement is a metal reinforcement.

[0018] By adopting the above technical solution, the overall strength of the invisible and easy-to-construct dual-core butterfly optical cable is further improved.

[0019] As a further preference, the separation groove has an arc-shaped cross section along a direction perpendicular to the axis of the outer sheath, and the reinforcement on the same side of the inner sheath is parallel to the separation groove.

[0020] By adopting the above technical solution, after the outer sheath is divided into two halves, the two reinforcement members are respectively located in the two outer sheaths, and the inner sheath will not be interfered by the reinforcement members when being separated, making the operation more convenient and simple, and reducing labor intensity.

[0021] As a further preferred embodiment, the separation groove has a straight-line shape in a cross section along a direction perpendicular to the axis of the outer sheath, two reinforcement members are provided, and the two reinforcement members are respectively provided on both sides of the inner sheath, the separation groove is located between the reinforcement member and the inner sheath, and the cable opening groove, the separation groove and the two reinforcement members are located on the same plane; Preferably, a pressing groove is provided on one side of the reinforcing member close to the separation groove, and the separation groove extends into the pressing groove.

[0022] By adopting the above technical solution, after the blade cuts the cable groove, the reinforcement member blocks the cutting direction of the blade to prevent the blade from entering too deeply and causing damage to the inner sheath on the optical fiber, further improving the protection effect. At the same time, the compression groove on the reinforcement member plays a role in compressing and protecting the end of the separation groove, improving the overall stability of the invisible and easy-to-construct dual-core butterfly optical cable, and avoiding the problem of cracking of the invisible and easy-to-construct dual-core butterfly optical cable caused by the separation groove extending outward.

[0023] As a further preference, the inner sheath is made of TPE transparent material, TPU transparent material or transparent nylon material.

[0024] By adopting the above technical solution, the inner sheath is made of transparent material, which is transparent and colorless when laid indoors, has strong concealment, does not affect the indoor decoration, and has a more beautiful laying effect.

[0025] As a further preference, the outer sheath is made of low-smoke halogen-free flame retardant material; preferably, the low-smoke halogen-free flame retardant material is any one of polyolefins, ethylene-propylene rubber and ethylene-vinyl acetate copolymer.

[0026] By adopting the above technical solution, the low-smoke halogen-free flame retardant material has excellent environmental protection and flame retardancy, thereby improving the safety and environmental protection of the optical cable.

[0027] In general, the above technical solutions conceived by this application have the following technical advantages compared with the prior art: 1. In the present application, two cable slots are provided on the outer sheath of the invisible and easy-to-construct dual-core butterfly optical cable, and the cable slots can be connected with the separation slots after extending radially from the outer sheath to the axis thereof. When the invisible and easy-to-construct dual-core butterfly optical cable is laid into a household, the inner sheath and the outer sheath of the invisible and easy-to-construct dual-core butterfly optical cable are separated, and the cable slots are cut by a blade, and the cable slots are extended and connected with the separation slots after opening, so as to open the outer sheath, thereby realizing the separation of the inner sheath and the outer sheath. This method can reduce the depth of the blade entering the outer sheath, so that the blade will not contact the inner sheath outside the optical fiber, and can avoid damage to the inner sheath and affect its protection effect on the optical fiber. At the same time, it is more convenient for operators to separate the optical fiber, the wiring and laying are convenient, and the construction process is simple.

[0028] 2. The inner sheath of the optical fiber surface of the invisible and easy-to-construct dual-core butterfly optical cable in this application is made of transparent material, so that it is transparent and colorless when laid indoors, has strong concealment, does not affect the indoor decoration, and has a more beautiful laying effect.

[0029] 3. The invisible and easy-to-construct dual-core butterfly optical cable in this application is provided with a reinforcement member, which can improve the overall strength of the invisible and easy-to-construct dual-core butterfly optical cable and improve the tensile performance, so that it has short-distance overhead performance and can be suitable for laying in a variety of environments.

[0030] 4. The invisible and easy-to-construct dual-core butterfly optical cable of the present application has a simple structure, is easy to manufacture, and is convenient to install and use. It is particularly suitable for use in fiber-to-the-home and fiber-to-the-desktop applications that require high concealment and two-point connection, and has better applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic cross-sectional structure diagram of the invisible and easy-to-construct dual-core butterfly optical cable provided in Example 1 of the present application; Figure 2 It is a schematic diagram of the cross-sectional structure of the invisible and easy-to-construct dual-core butterfly optical cable provided in Example 2 of the present application.

[0032] Throughout the drawings, the same reference numerals are used to denote the same elements or structures, wherein: 1. Cable core; 101. Optical fiber; 102. Inner sheath; 102-1. Upper semicircle; 102-2. Lower semicircle; 2. Outer sheath; 201. Cable groove; 202. Separation groove; 3. Reinforcement member; 301. Compression groove. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0034] In order to meet the needs of the current fiber-to-the-home Internet transmission system, the present application provides an invisible and easy-to-construct dual-core butterfly optical cable, so as to meet the requirements of dual-core butterfly optical cable wiring, which can realize two-point wiring at the same time, or use one-for-one wiring. It has the characteristics of easy divergence, invisibility and two-point connection, especially in the optical network architecture with dual-core requirements, the wiring and laying are convenient, the construction process is simple, the construction effect is beautiful, and the wiring and laying efficiency is effectively improved. At the same time, the structure is simple, easy to make, and the laying and use are convenient. It is especially suitable for dual-core fiber-to-the-home and fiber-to-the-desktop where invisibility is required.

[0035] Embodiment 1: Reference Figure 1 The present application discloses an invisible and easy-to-construct dual-core butterfly optical cable, which includes a cable core 1, an outer sheath 2 and a reinforcement member 3. The cross-section of the outer sheath 2 along the axial direction is circular. The outer sheath 2 covers and fits the outside of the cable core 1 and the reinforcement member 3 to constrain the cable core 1 and the reinforcement member 3. In this embodiment, the outer diameter of the cross-section of the outer sheath 2 along the direction perpendicular to the axial direction is 2.4±0.2mm. When the dual-core butterfly optical cable is introduced into the home, the reinforcement member 3 and the outer sheath 2 are separated and removed, and only the cable core 1 is used for indoor wiring.

[0036] Among them, the cable core 1 includes two optical fibers 101 arranged in parallel and spaced apart from each other up and down and an inner sheath 102 covering the outside of the two optical fibers 101. The two optical fibers 101 are constrained by the inner sheath 102. The cross section of the inner sheath 102 along the direction perpendicular to the axis of the outer sheath 2 is in the shape of an 8 and is an integrated structure. The 8-shaped inner sheath 102 includes an upper semicircular portion 102-1 and a lower semicircular portion 102-2. One optical fiber 101 is located in the upper semicircular portion 102-1 of the inner sheath 102, and the other optical fiber 101 is located in the lower semicircular portion 102-2 of the inner sheath 102. The optical fiber 101 is the optical communication unit in the invisible and easy-to-construct dual-core butterfly optical cable. In the cross section of the cable core 1 along the direction perpendicular to its axis, the cable core 1 as a whole constitutes an 8-shaped dual-core structure. When the invisible and easy-to-construct dual-core butterfly optical cable is laid indoors, the inner sheath 102 and the outer sheath 2 need to be separated to facilitate the laying and connection of the two optical fibers 101. In order to facilitate the distinction and identification of the two optical fibers 101, the outer diameters of the upper semicircular portion 102-1 of the inner sheath 102 and the lower semicircular portion 102-2 of the inner sheath 102 are different, so as to avoid the need for dismantling and reconnecting after the operator makes a connection error during actual operation, which affects the operation efficiency. Specifically, the outer diameter of the lower semicircular portion 102-2 of the inner sheath 102 is 0.9±0.05mm, the outer diameter of the upper semicircular portion 102-1 of the inner sheath 102 is 0.6±0.05mm, and the overall height of the inner sheath 102 is 1.5±0.05mm.

[0037] In this embodiment, the inner part of the outer sheath 2 is provided with an installation cavity adapted to the installation of the inner sheath 102 along the extension direction of its axis, the inner sheath 102 can be arranged in the installation cavity, and the outer sheath 2 covers and fits the outer part of the inner sheath 102. In order to facilitate the separation of the outer sheath 2 and the inner sheath 102 when the invisible and easy-to-construct dual-core butterfly optical cable is wired, two cable grooves 201 arranged symmetrically and along the extension direction of its axis are provided on the outer peripheral surface of the outer sheath 2. The outer sheath 2 and the inner sheath 102 of the invisible and easy-to-construct dual-core butterfly optical cable can be separated by the cable grooves 201. When the invisible and easy-to-construct dual-core butterfly optical cable is brought into the house, the outer sheath 2 is removed by using the cable grooves 201, and the outer sheath 2 and the inner sheath 102 are separated before indoor wiring. The cross section of the cable groove 201 along the direction perpendicular to the axis of the outer sheath 2 is V-shaped, and the V-shaped opening faces the outer peripheral surface of the outer sheath 2. The V-shaped opening angle is 20°~30°, so that it is convenient to cut and extend it with a blade. The arrangement of two V-shaped cable grooves 201 on the invisible and easy-to-construct dual-core butterfly optical cable makes the entire invisible and easy-to-construct dual-core butterfly optical cable in a butterfly shape along the cross section perpendicular to the axis.

[0038] Furthermore, two separation grooves 202 connected to the installation cavity are provided inside the outer sheath 2 along the extension direction of its axis. Specifically, the two separation grooves 202 are respectively located on both sides of the inner sheath 102, and the two separation grooves 202 and one end of the two separation grooves 202 are located in the recessed portion of the inner sheath 102. The recessed portion of the inner sheath 102 can squeeze and fix one end of the separation groove 202, thereby improving the overall stability of the invisible and easy-to-construct dual-core butterfly optical cable. When the cable groove 201 is opened, it can extend along the radial direction of the outer sheath 2 toward its axis to achieve communication with the separation groove 202. The cable groove 201 is cut by a blade, and the cable groove 201 is connected to the separation groove 202 after opening, so as to more conveniently open the outer sheath 2, thereby achieving separation of the inner sheath 102 and the outer sheath 2. This method reduces the depth of the blade entering the outer sheath 2, and the blade will not contact the inner sheath 102 outside the optical fiber 101, thereby avoiding damage to the inner sheath 102.

[0039] Specifically, the inner sheath 102 in the present application is made of, but not limited to, TPE transparent material, TPU transparent material and / or transparent nylon material. In this embodiment, the inner sheath 102 is made of transparent nylon material, so that the cable core 1 is an 8-shaped double-core transparent nylon tight-sleeved cable core. The outer sheath 2 is made of low-smoke halogen-free flame-retardant material; preferably, the low-smoke halogen-free flame-retardant material is made of, but not limited to, any one of polyolefins, ethylene-propylene rubber and ethylene-vinyl acetate copolymer.

[0040] Furthermore, the reinforcement member 3 of the invisible and easy-to-construct dual-core butterfly optical cable in the present application is a metal reinforcement member 3. In the present embodiment, the reinforcement member 3 is made of steel wire. There are at least two reinforcement members 3 in the invisible and easy-to-construct dual-core butterfly optical cable. In the present application, two reinforcement members 3 are set and the two reinforcement members 3 are arranged in parallel and spaced apart. The two reinforcement members 3 are respectively located on the left and right sides of the inner sheath 102 and are arranged symmetrically. The spacing between the two reinforcement members 3 is 1.2±0.1mm. On the cross section perpendicular to the axial direction of the outer sheath 2, the cross section of the two reinforcement members 3 is on the same straight line as the recessed portions on the left and right sides of the cross section of the inner sheath 102, and the reinforcement members 3 are arranged along the axial extension direction of the outer sheath 2.

[0041] In the embodiment of the present application, the separation groove 202 inside the outer sheath 2 is arc-shaped along the cross-section perpendicular to the axial direction of the outer sheath 2, and the reinforcement member 3 on the same side of the inner sheath 102 is parallel to the separation groove 202. When the cable opening groove 201 is opened and connected to the separation groove 202, the outer sheath 2 is divided into two halves, and the two reinforcement members 3 are respectively located in the two outer sheaths 2. When the two optical fibers 101 are separated, they will not be interfered by the reinforcement members 3, thereby improving the convenience and efficiency of separation.

[0042] Embodiment 2: Reference Figure 2The difference between this embodiment and the embodiment 1 is that the separation groove 202 is in a straight line shape along the cross section perpendicular to the axis direction of the outer sheath 2. On the cross section of the outer sheath 2 along the axis direction, the separation groove 202 and the cable core 1 are arranged perpendicular to each other, that is, the arrangement direction of the separation groove 202 is perpendicular to the direction of the axis connection of the two optical fibers 101. The two reinforcement members 3 are respectively arranged on both sides of the inner sheath 102. The separation groove 202 is located between the corresponding reinforcement members 3 and the inner sheath 102. The cable groove 201, the separation groove 202 and the two reinforcement members 3 are located on the same plane. After the blade cuts the cable groove 201, the reinforcement member 3 blocks the cutting direction of the blade to prevent the blade from entering too deep and causing damage to the inner sheath 102 on the optical fiber 101. The protection effect is further improved; preferably, a compression groove 301 is opened on one side of the reinforcement member 3 close to the separation groove 202, and the separation groove 202 extends into the compression groove 301 and is connected with the installation space of the reinforcement member 3. The compression groove 301 on the reinforcement member 3 plays a role in compressing and protecting the end of the separation groove 202, so that both ends of the separation groove 202 are squeezed and fixed, further improving the overall stability of the dual-core butterfly optical cable, avoiding the problem of cracking of the dual-core butterfly optical cable after the separation groove 202 extends outward, and when the inner sheath 102 and the outer sheath 2 are separated, after the blade cuts the cable groove 201, the reinforcement member 3 can be separated first, and then after the separation groove 202 is opened, the inner sheath 102 and the outer sheath 2 are separated.

[0043] It should be understood that expressions such as "include" and "may include" used in this application indicate the existence of the disclosed functions, operations or constituent elements, and do not limit one or more additional functions, operations and constituent elements. In this application, terms such as "include" and / or "have" may be interpreted as indicating specific characteristics, numbers, operations, constituent elements, components or combinations thereof, but may not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components or combinations thereof.

[0044] It should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like 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 application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0046] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. An invisible and easy-to-construct dual-core butterfly optical cable, characterized in that: include: A cable core (1), the cable core (1) comprising two optical fibers (101) arranged in parallel and spaced apart from each other, and an inner sheath (102) covering the outside of the two optical fibers (101) and constraining the two optical fibers (101); An outer sheath (2), wherein an installation cavity for installing the inner sheath (102) is provided inside the outer sheath (2) along the extension direction of its axis, and the outer sheath (2) covers and fits the outside of the inner sheath (102); a cable groove (201) is provided on the outer peripheral surface of the outer sheath (2) along the extension direction of its axis; a separation groove (202) communicating with the installation cavity is provided inside the outer sheath (2) along the extension direction of its axis, and after the cable groove (201) is opened, it can extend along the radial direction of the outer sheath (2) toward its axis to achieve communication with the separation groove (202).

2. The invisible and easy-to-construct dual-core butterfly optical cable according to claim 1, characterized in that: The cross section of the cable opening groove (201) along a direction perpendicular to the axis of the outer sheath (2) is V-shaped, and the V-shaped opening faces the outer peripheral surface of the outer sheath (2).

3. The invisible and easy-to-construct dual-core butterfly optical cable according to claim 1, characterized in that: The two cable opening grooves (201) and the two separation grooves (202) are each provided with two, the two separation grooves (202) are respectively located on both sides of the inner sheath (102), and the two cable opening grooves (201) are symmetrically arranged on both sides of the outer sheath (2) and correspond to the two separation grooves (202).

4. The invisible and easy-to-construct dual-core butterfly optical cable according to claim 1, characterized in that: The cross section of the inner sheath (102) along a direction perpendicular to the axis of the outer sheath (2) is in an 8-shape and is an integrally formed structure, and one end of the separation groove (202) is located in a recessed portion of the inner sheath (102).

5. The invisible and easy-to-construct dual-core butterfly optical cable according to claim 4, characterized in that: The 8-shaped inner sheath (102) comprises an upper semicircular portion (102-1) and a lower semicircular portion (102-2), and the outer diameters of the upper semicircular portion (102-1) and the lower semicircular portion (102-2) are different.

6. The invisible and easy-to-construct dual-core butterfly optical cable according to claim 1, characterized in that: The invisible and easy-to-construct dual-core butterfly optical cable also includes at least two parallel and spaced reinforcement members (3), wherein the reinforcement members (3) are respectively located on both sides of the inner sheath (102), and the reinforcement members (3) are arranged along the axial extension direction of the outer sheath (2).

7. The invisible and easy-to-construct dual-core butterfly optical cable according to claim 6, characterized in that: The reinforcement member (3) is a metal reinforcement member (3).

8. The invisible and easy-to-construct dual-core butterfly optical cable according to claim 6, characterized in that: The separation groove (202) has an arc-shaped cross section along a direction perpendicular to the axis of the outer jacket (2), and the reinforcement member (3) on the same side of the inner jacket (102) is parallel to the separation groove (202).

9. The invisible and easy-to-construct dual-core butterfly optical cable according to claim 6, characterized in that: The separation groove (202) has a straight-line cross section along a direction perpendicular to the axis of the outer sheath (2); two reinforcement members (3) are provided, and the two reinforcement members (3) are respectively provided on both sides of the inner sheath (102); the separation groove (202) is located between the reinforcement member (3) and the inner sheath (102); and the cable opening groove (201), the separation groove (202) and the two reinforcement members (3) are located on the same plane; Preferably, a pressing groove (301) is provided on one side of the reinforcing member (3) close to the separation groove (202), and the separation groove (202) extends into the pressing groove (301).

10. An invisible and easy-to-construct dual-core butterfly optical cable as claimed in any one of claims 1 to 9, characterized in that: The inner sheath (102) is made of TPE transparent material, TPU transparent material or transparent nylon material; the outer sheath (2) is made of low-smoke halogen-free flame-retardant material; Preferably, the low-smoke halogen-free flame retardant material is any one of polyolefins, ethylene-propylene rubbers and ethylene-vinyl acetate copolymers.

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