A butterfly entry optical cable with two entry units

Abstract

The present application belongs to the technical field of optical cable, and discloses a butterfly-shaped lead-in optical cable with two kinds of lead-in units, which has a cable core, and is characterized in that: the cable core is composed of four sub-units; each sub-unit is composed of a unit shell, two first kind of lead-in units and one second kind of lead-in unit located in the unit shell, and the first kind of lead-in units are located on both sides of the second kind of lead-in unit; the cross-section outer edge of the unit shell is a regular octagon; the four unit shells are spliced to form a central hole with a square cross-section, and the outside of the splicing part of the adjacent unit shells forms an outer cavity; the unit shells of the four sub-units are integrally formed, or the unit shells of the four sub-units are formed into a whole through bonding or fusion. The present application has the following main beneficial technical effects: more lead-in units, better adaptability and matching with the optical interface of optical equipment, higher space utilization, and simultaneous transmission of optical and electrical signals.

Description

Technical Field

[0001] This invention belongs to the field of optical cable technology, and in particular discloses a butterfly-shaped optical cable with two types of entry units. Background Technology

[0002] In existing technology, commonly used butterfly-shaped drop cables or butterfly-shaped drop units mainly come in two sizes: one with a nominal height of 3mm and a nominal width of 2mm; the other with a nominal height of 2mm and a nominal width of 1.6mm. These are compatible with widely used fiber optic connectors, which can be inserted into the optical transceiver ports of corresponding optical equipment. The shape of the butterfly-shaped drop cable or butterfly-shaped drop unit is described in the People's Republic of China Communications Industry Standard YD / 1997-2009 "Butterfly-shaped Drop Cables for Access Networks". Currently, only one size of butterfly-shaped drop cable or butterfly-shaped drop unit is used in a single optical cable. However, in actual use, the optical equipment purchased by users generally only has one type of optical interface, and the size of the optical interface is relatively random, with different manufacturers having different optical interfaces. Therefore, the single-structure optical cable makes it difficult for users to use smoothly, causing inconvenience and affecting the sales and use of the optical cable.

[0003] CN114942498A discloses a butterfly-shaped drop cable for communication, comprising a fitting component, multiple protective bodies, multiple butterfly-shaped drop units, a protective layer, and an outer sheath. The fitting component is characterized by being composed of multiple fitting bodies, with the butterfly-shaped drop units located within the protective bodies. The other end of each fitting body is embedded in one of the fitting cavities of a protective body. All protective bodies and the fitting component combine to form a regular polyhedron shape. The protective layer covers all the protective bodies, and the outer sheath covers the protective layer. While it forms a hexagonal cross-section cable core through the arrangement of the prismatic protective bodies, it is limited to only three butterfly-shaped units, which cannot meet the needs of users with multiple units.

[0004] CN115079362A discloses a butterfly-shaped optical cable with multiple irregularly shaped entry units, comprising a protective component and irregularly shaped entry units. The irregularly shaped entry unit is characterized by: the irregularly shaped entry unit consisting of an optical fiber, a pair of reinforcing members, and a first irregularly shaped sheath; the protective component consisting of an outer sheath and a second irregularly shaped sheath, the second irregularly shaped sheath consisting of a first irregularly shaped body and a second irregularly shaped body, one side edge of the second irregularly shaped sheath being joined to the inner wall of the outer sheath, the inner wall of the outer sheath and the second irregularly shaped sheath together forming a receiving cavity, the irregularly shaped entry units being located within the receiving cavity, and the irregularly shaped entry units and the second irregularly shaped sheaths being spaced apart along the clockwise or counterclockwise direction of the inner wall of the outer sheath, with the outer edges of any two irregularly shaped entry units near the center of the optical cable being externally tangent; each second irregularly shaped sheath is embedded within the side edge of the adjacent irregularly shaped entry unit, providing only three irregularly shaped entry units each, which cannot meet the needs of a large number of users. Summary of the Invention

[0005] To address the aforementioned problems, the present invention aims to disclose a butterfly-shaped optical cable with two types of introduction units, which is achieved using the following technical solution.

[0006] A butterfly-shaped optical cable with two types of entry units, having a cable core, characterized in that: the cable core is composed of four sub-units; each sub-unit is composed of a unit shell, two first-type entry units located inside the unit shell, and one second-type entry unit, with the first-type entry units located on both sides of the second-type entry unit; the outer edge of the cross-section of the unit shell is a regular octagon; the four unit shells are joined together to form a central hole with a square cross-section, and the outer surface of the joint between adjacent unit shells forms an outer cavity; the unit shells of the four sub-units are integrally formed, or the unit shells of the four sub-units are bonded or fused together to form a whole.

[0007] The above-described butterfly-shaped optical cable with two types of entry units is characterized in that it further comprises an optical fiber ribbon or a reinforcing member, wherein the optical fiber ribbon or reinforcing member is located inside the central hole.

[0008] A butterfly-shaped drop cable with two types of drop units comprises a cable core, a protective layer, and an outer sheath, wherein the protective layer covers the cable core and the outer sheath covers the protective layer; characterized in that: the cable core is composed of an optical fiber ribbon, four sub-units, and four filling components; each sub-unit consists of a unit shell, two first-type drop units located within the unit shell, and one second-type drop unit, with the first-type drop units located on both sides of the second-type drop unit; the outer edge of the cross-section of the unit shell is a regular octagon; each filling component consists of a filling body and an insulated wire located inside the filling body; the four unit shells are joined to form a central hole with a square cross-section, and the outer surface of the joint between adjacent unit shells forms an outer cavity, with the filling component located within the outer cavity; the optical fiber ribbon is located within the central hole.

[0009] A butterfly-shaped optical cable with two types of entry units comprises a cable core, a protective layer, and an outer sheath, wherein the protective layer covers the cable core and the outer sheath covers the protective layer; characterized in that: the cable core is composed of four sub-units and four filling components; each sub-unit consists of a unit shell, two first-type entry units located within the unit shell, and one second-type entry unit, with the first-type entry units located on both sides of the second-type entry unit; the outer edge of the cross-section of the unit shell is a regular octagon; each filling component consists of a filling body and an insulated wire located inside the filling body; the four unit shells are joined together to form a central hole with a square cross-section, and the outer surface of the joint between adjacent unit shells forms an outer cavity, with the filling component located within the outer cavity; the unit shells of the four sub-units are integrally formed, or the unit shells of the four sub-units are bonded or fused together to form a whole.

[0010] The present invention has the following main beneficial technical effects: it introduces more units, has better adaptability and matching with the optical interface of optical devices, higher space utilization, and can transmit photoelectric signals simultaneously. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the three-dimensional structure after dissection for Example 1.

[0012] Figure 2 for Figure 1 Enlarged cross-sectional structural diagram.

[0013] Figure 3 This is a schematic diagram of the cross-sectional structure of the cable core after the central optical fiber strip is removed in Implementation Example 1.

[0014] Figure 4 This is a three-dimensional structural diagram of a section of a sub-unit of the cable core in Implementation Example 1 after dissection.

[0015] Figure 5 for Figure 4 Enlarged cross-sectional structural diagram.

[0016] Figure 6 A schematic diagram of the three-dimensional structure after removing the introduced unit from 4.

[0017] Figure 7 for Figure 6 Enlarged cross-sectional structural diagram.

[0018] Figure 8 This is a schematic diagram of the three-dimensional structure after dissection for Example 2.

[0019] Figure 9 for Figure 8 Enlarged cross-sectional structural diagram. Detailed Implementation

[0020] To enable those skilled in the art to better understand and implement this patent, the markings in the accompanying drawings are explained in detail below.

[0021] In the figure: 1—Fiber optic ribbon, 2—First type of introduction unit, 3—Unit housing, 4—Second type of introduction unit, 5—Filling component, 6—Protective layer, 7—Outer sheath, 10—Central hole, 21—Introduction sheath, 22—Optical fiber, 23—Reinforcing member, 24—Tear opening, 31—First outer wall, 32—Second outer wall, 33—Third outer wall, 34—Fourth outer wall, 35—Fifth outer wall, 36—Sixth outer wall, 37—Seventh outer wall, 38—Eighth outer wall, 301—First accommodating cavity, 302—Second accommodating cavity Cavity, 303—Third accommodating cavity, 304—Fourth accommodating cavity, 305—Fifth accommodating cavity, 311—First inner wall, 313—Second inner wall, 331—Third inner wall, 371—Fourth inner wall, 357—Fifth inner wall, 351—Sixth inner wall, 41—First protective sleeve, 42—Second protective sleeve, 43—Third protective sleeve, 44—Reinforcing member, 45—Optical fiber, 46—Adhesive layer, 51—First filler, 52—Second filler, 53—Third filler, 54—Conductor, 55—Insulating sleeve, 60—Outer cavity.

[0022] Please see Figures 1 to 7 A butterfly-shaped drop cable with two types of drop units, comprising a cable core, a protective layer 6, and an outer sheath 7, wherein the protective layer covers the cable core and the outer sheath covers the protective layer; characterized in that: the cable core is composed of an optical fiber ribbon 1, four sub-units, and four filling components 5; each sub-unit is composed of a unit housing 3, two first-type drop units 2 and one second-type drop unit 4 located inside the unit housing, with the first-type drop units located on both sides of the second-type drop units; the outer edge of the cross-section of the unit housing is a regular octagon; each filling component 5 is composed of a filling body and an insulated wire located inside the filling body; the four unit housings are spliced ​​to form a central hole 10 with a square cross-section, and the outer surface of the splicing point of adjacent unit housings forms an outer cavity 60, with the filling component located inside the outer cavity; the optical fiber ribbon 1 is located inside the central hole.

[0023] The aforementioned butterfly-shaped optical cable with two types of entry units is characterized in that: the unit housing 3 is composed of a first outer wall 31, a second outer wall 32, a third outer wall 33, a fourth outer wall 34, a fifth outer wall 35, a sixth outer wall 36, a seventh outer wall 37, an eighth outer wall 38, a first inner wall 311, a second inner wall 313, a third inner wall 331, a fourth inner wall 371, a fifth inner wall 357, and a sixth inner wall 351. The unit housing is an integral structure, with the first to eighth outer walls connected sequentially at their ends. The tail end of the eighth outer wall is connected to the head end of the first outer wall. The outer edge of the cross-section of the unit housing is a regular octagon. One end of the first inner wall 311 is connected to... The first inner wall 311 is connected to the center of the inner edge of the first outer wall 31. The other end of the first inner wall 311 is connected to one end of the second inner wall 313. The other end of the second inner wall 313 is connected to the other end of the third inner wall 331. One end of the third inner wall 331 is connected to the center of the inner edge of the third outer wall 33. The first inner wall 311 is parallel to the third outer wall 33. The second inner wall 313 is parallel to the second outer wall 32. The third inner wall 331 is parallel to the first outer wall 31. One end of the fourth inner wall 371 is connected to the center of the inner edge of the seventh outer wall 37. The other end of the fourth inner wall 371 is connected to one end of the fifth inner wall 357. The other end of the fifth inner wall 357 is connected to the sixth inner wall 371. At the other end of 51, one end of the sixth inner wall 351 is connected to the center of the inner edge of the fifth outer wall 35. The fourth inner wall 371 is parallel to the fifth outer wall 35, the fifth inner wall 357 is parallel to the sixth outer wall 36, and the sixth inner wall 351 is parallel to the seventh outer wall 37. The first outer wall 31, the second outer wall 32, the third outer wall 33, the third inner wall 331, the second inner wall 313, and the first inner wall 311 form a first accommodating cavity 301. The fifth outer wall 35, the sixth outer wall 36, the seventh outer wall 37, the fourth inner wall 371, the fifth inner wall 357, and the sixth inner wall 351 form a second accommodating cavity 302. The first outer wall 31, the first inner wall 371, the second outer wall 351, the third inner wall 371, the fourth inner wall 371, the fifth inner wall 357, and the sixth inner wall 351 form a second accommodating cavity 302. Wall 311, second inner wall 313, third inner wall 331, third outer wall 33, fourth outer wall 34, fifth outer wall 35, sixth inner wall 351, fifth inner wall 357, fourth inner wall 371, seventh outer wall 37, and eighth outer wall 38 form a large accommodating cavity; first outer wall 31, first inner wall 311, fourth inner wall 371, seventh outer wall 37, and eighth outer wall 38 form a third accommodating cavity 303; second inner wall 313 and fifth inner wall 357 form a fifth accommodating cavity 305; third inner wall 331, third outer wall 33, fourth outer wall 34, fifth outer wall 35, and sixth inner wall 351 form a fourth accommodating cavity 304;The large accommodating cavity is composed of a third accommodating cavity 303, a fifth accommodating cavity 305, and a fourth accommodating cavity 304. The fifth accommodating cavity 305 communicates with the third accommodating cavity 303, and the fifth accommodating cavity 305 communicates with the fourth accommodating cavity 304.

[0024] The above-described butterfly-shaped optical cable with two types of entry units is characterized in that: the first entry unit 2 is composed of an entry sheath 21, an optical fiber 22, and two reinforcing members 23. The cross-section of the entry sheath is a hexagon with opposite sides parallel. On the cross-section of the entry sheath, the distance between the pair of parallel sides with the smallest distance is called the width of the first entry unit, and the length between the two vertices with the largest distance is called the height of the first entry unit. The entry sheath completely covers the optical fiber 22 and the reinforcing members 23. The optical fiber is located in the center of the entry sheath. The two reinforcing members and the optical fiber are distributed along the height direction of the first entry unit. The two reinforcing members are located on both sides of the optical fiber. The entry sheath has a recessed tear 24 in the direction that passes through the center of the optical fiber and is perpendicular to the height of the first entry unit. The first entry unit 2 is located in the first accommodating cavity 301 and the second accommodating cavity 302.

[0025] The above-described butterfly-shaped optical cable with two types of entry units is characterized in that: the second entry unit 4 is composed of a protective sleeve body, two reinforcing members 44, and an optical fiber tape. The optical fiber tape is composed of multiple optical fibers 45 arranged in a row and not in contact with each other, and an adhesive layer 46 covering all the optical fibers. The protective sleeve body is composed of a first protective sleeve 41, a second protective sleeve 42, and a third protective sleeve 43. The third protective sleeve is located between the first and second protective sleeves and is integrated with the first and second protective sleeves. The two reinforcing members are located inside the first and second protective sleeves, respectively, and the optical fiber tape is located inside the third protective sleeve. The second entry unit 4 is located inside a large accommodating cavity.

[0026] The above-described butterfly-shaped optical cable with two types of entry units is characterized in that: the filling body is composed of a first filling body 51, a second filling body 52, and a third filling body 53, the filling body is an integral structure, the third filling body 53 connects the first filling body 51 and the second filling body 52 located on both sides of the third filling body 53, the outer edge of the cross-section of the filling body is formed by connecting an arc segment, a first straight segment of the first filling body, a first straight segment of the third filling body, a second straight segment of the third filling body, and a first straight segment of the second filling body, the outer edge of the cross-section of the filling body is a closed structure, and the first straight segment of the third filling body is perpendicular to the second straight segment of the third filling body.

[0027] The above-described butterfly-shaped optical cable with two types of entry units is characterized in that: the insulated wire is composed of a conductor 54 and an insulating sleeve 55 covering the conductor.

[0028] The butterfly-shaped optical cable with two types of introduction units described above is characterized in that the top of the outer cavity 60 is a right angle.

[0029] The above-described butterfly-shaped optical cable with two types of entry units is characterized in that: on any plane perpendicular to the axis of the butterfly-shaped optical cable, the lengths of the first straight segment of the first filler, the first straight segment of the second filler, the first straight segment of the third filler, and the second straight segment of the third filler are all equal.

[0030] The butterfly-shaped optical cable with two types of entry units described above is characterized in that: on any plane perpendicular to the axis of the butterfly-shaped optical cable, the length of the first straight segment of the first filler is equal to the length of the outer edge of any outer wall of the unit housing.

[0031] The above-described butterfly-shaped optical cable with two types of introduction units is characterized in that: the cross-section of the large accommodating cavity is dumbbell-shaped or a deformed dumbbell shape, and the outer edge of the cross-section of the corresponding second type of introduction unit 4 is also dumbbell-shaped or a deformed dumbbell shape.

[0032] The butterfly-shaped optical cable with two types of introduction units described above is characterized in that: the shape of the outer edge of the cross-section of the first type of introduction unit 2 is similar to the shape of the first accommodating cavity 301 and the second accommodating cavity 302.

[0033] The above-described butterfly-shaped optical cable with two types of introduction units is characterized in that: the unit housing 3 has a symmetrical structure.

[0034] The butterfly-shaped optical cable with two types of introduction units described above is characterized in that: the filling component 5 has a symmetrical structure.

[0035] The butterfly-shaped optical cable with two types of introduction units described above is characterized in that: the first type of introduction unit 2 and the second type of introduction unit 4 are each symmetrical in structure.

[0036] The above-described butterfly-shaped optical cable with two types of introduction units is characterized in that: the optical fiber strip inside the central hole 10 can also be replaced by a reinforcing member that matches the central hole 10 to increase the strength of the optical cable; or even the central hole 10 can be empty.

[0037] The above-described butterfly-shaped drop cable with two drop units is characterized in that: the optical fiber strip 1 is an optical fiber strip in the prior art, such as the one recommended in the People's Republic of China Communications Industry Standard YD / T 979.

[0038] Please see Figure 8 and Figure 9 and refer to Figures 1 to 7A butterfly-shaped optical cable with two types of entry units is basically the same as in Embodiment 1, except that: firstly, it does not have a filling component 5, a protective layer 6, or an outer sheath 7; secondly, the four sub-units are an integral structure, that is, the unit shell 3 of the four sub-units is formed as a whole, or the unit shell 3 of the four sub-units is formed as a whole by bonding or fusing. Of course, the four sub-units of the integral structure in this embodiment can also be called the cable core, and the cable core can also be used in Embodiment 1.

[0039] In this application, the preferred structure is that the nominal height of the second type of introduced unit 4 is 3mm and the nominal width is 2mm.

[0040] In this application, the preferred structure is that the nominal height of the first type of introducing unit 2 is 2 mm and the nominal width is 1.6 mm.

[0041] The butterfly-shaped optical cable with two types of entry units described in this application is characterized in that: the material of the protective layer 6 is polyester tape, polyester yarn, water-blocking yarn, water-blocking tape, non-woven fabric, steel tape, or aluminum tape.

[0042] The butterfly-shaped optical cable with two types of entry units described in this application is characterized in that the outer sheath 7 is made of plastic.

[0043] The butterfly-shaped optical cable with two types of entry units described in this application is characterized in that the material of the entry sheath 21 is plastic.

[0044] The butterfly-shaped optical cable with two types of entry units described in this application is characterized in that: the optical fiber 22 is of type G.652 or G.653 or G.654 or G.655 or G.656 or G.657 or A1a or A1b or A1c or A1d or A1e.

[0045] The butterfly-shaped optical cable with two types of entry units described in this application is characterized in that: the material of the reinforcing member 23 is steel wire, copper wire, aluminum wire, lead wire, glass fiber reinforced plastic rod, aramid yarn, or glass fiber yarn.

[0046] The butterfly-shaped optical cable with two types of entry units described in this application is characterized in that: the material of the unit housing 3 is plastic, steel, iron, aluminum, copper, aluminum alloy, or copper alloy.

[0047] The butterfly-shaped optical cable with two types of entry units described in this application is characterized in that the material of the protective sleeve body is plastic.

[0048] The butterfly-shaped optical cable with two types of entry units described in this application is characterized in that: the material of the reinforcing member 44 is steel wire, copper wire, aluminum wire, lead wire, glass fiber reinforced plastic rod, aramid yarn, or glass fiber yarn.

[0049] The butterfly-shaped drop cable with two drop units described in this application is characterized in that: the fiber 45 is of type G.652 or G.653 or G.654 or G.655 or G.656 or G.657 or A1a or A1b or A1c or A1d or A1e.

[0050] The butterfly-shaped optical cable with two types of introduction units described in this application is characterized in that the adhesive layer 46 is made of plastic.

[0051] The butterfly-shaped optical cable with two types of introduction units described in this application is characterized in that the filling body is made of plastic.

[0052] The butterfly-shaped optical cable with two types of drop units described in this application is characterized in that the material of the conductor 54 is copper, aluminum, copper alloy, or aluminum alloy.

[0053] The butterfly-shaped optical cable with two types of entry units described in this application is characterized in that the insulating sleeve 55 is made of plastic.

[0054] Compared to existing technologies, the butterfly-shaped drop cable in this application has eight first-type drop units 2 and four second-type drop units 4, which increases the number of units and enables it to meet the needs of most users in single-story buildings.

[0055] This application provides convenience for users by having two types of introductory units of different sizes, so users do not need to worry about the problem of mismatched optical interface sizes when purchasing optical equipment.

[0056] In this application, each unit shell has two types of introduced units of different sizes, which are extremely convenient to use as sub-units. Moreover, the unit shell can be made into a fairly thin shell, as long as it has sufficient strength. Furthermore, the unit shell has a regular octahedral structure, which makes full use of the internal space and effectively saves space.

[0057] This application also includes insulated wires, which can be used as power transmission components to allow high-voltage electricity and optical signals to enter the house simultaneously, achieving the purpose of laying a single cable and realizing at least two functions; in this application, the arc portions of all filling components are on the same cylindrical surface, making the product structure round and smooth; in this application, each sub-unit can actually be used as a sub-optical cable.

[0058] In this application, the optical fiber ribbon is included, which further increases the capacity of optical communication. At the same time, the butterfly optical cable and multiple optical fiber ribbons are co-cabled, realizing high-capacity, high-density optical transmission.

[0059] This application has the following main beneficial technical effects: it introduces more units, has better adaptability and matching with the optical interface of optical devices, higher space utilization, and can transmit photoelectric signals simultaneously.

[0060] The above embodiments are merely preferred technical solutions of the present invention and should not be considered as limitations on the present invention. The scope of protection of the present invention should be limited to the technical solutions described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the scope of protection of the present invention.

Claims

1. A butterfly-shaped drop optical cable with two drop units, comprising a cable core, a protective layer, and an outer sheath, wherein the protective layer covers the cable core and the outer sheath covers the protective layer; characterized in that: The cable core consists of an optical fiber ribbon, four sub-units, and four filling components. Each sub-unit comprises a unit housing, two first-type entry units located within the unit housing, and one second-type entry unit, with the first-type entry units located on either side of the second-type entry units. The outer edge of the unit housing's cross-section is a regular octagon. Each filling component consists of a filling body and an insulated wire located inside the filling body. The four unit housings are joined together to form a central hole with a square cross-section. The outer surface of the joint between adjacent unit housings forms an outer cavity, within which the filling components are located. The optical fiber ribbon is located within the central hole. The unit housing consists of a first outer wall, a second outer wall, a third outer wall, a fourth outer wall, a fifth outer wall, and a sixth outer wall. The unit shell is composed of a seventh outer side wall, an eighth outer side wall, a first inner side wall, a second inner side wall, a third inner side wall, a fourth inner side wall, a fifth inner side wall, and a sixth inner side wall. The unit shell is a single-piece structure. The first to eighth outer side walls are connected end-to-end sequentially, with the tail end of the eighth outer side wall connected to the head end of the first outer side wall. The outer edge of the unit shell's cross-section is a regular octagon. One end of the first inner side wall is connected to the center of the inner edge of the first outer side wall, and the other end of the first inner side wall is connected to one end of the second inner side wall. The other end of the second inner side wall is connected to the other end of the third inner side wall, and one end of the third inner side wall is connected to the center of the inner edge of the third outer side wall. The first inner side wall and the third outer side wall are flush. Okay, the second inner wall is parallel to the second outer wall, and the third inner wall is parallel to the first outer wall; one end of the fourth inner wall is connected to the center of the inner edge of the seventh outer wall, and the other end of the fourth inner wall is connected to one end of the fifth inner wall, the other end of the fifth inner wall is connected to the other end of the sixth inner wall, and one end of the sixth inner wall is connected to the center of the inner edge of the fifth outer wall. The fourth inner wall is parallel to the fifth outer wall, the fifth inner wall is parallel to the sixth outer wall, and the sixth inner wall is parallel to the seventh outer wall; the first outer wall, the second outer wall, the third outer wall, the third inner wall, the second inner wall, and the first inner wall form a first accommodating cavity; the fifth outer wall... The sixth outer side wall, the seventh outer side wall, the fourth inner side wall, the fifth inner side wall, and the sixth inner side wall form a second accommodating cavity; the first outer side wall, the first inner side wall, the second inner side wall, the third inner side wall, the third outer side wall, the fourth outer side wall, the fifth outer side wall, the sixth inner side wall, the fifth inner side wall, the fourth inner side wall, the seventh outer side wall, and the eighth outer side wall form a large accommodating cavity; the first outer side wall, the first inner side wall, the fourth inner side wall, the seventh outer side wall, and the eighth outer side wall form a third accommodating cavity; the second inner side wall and the fifth inner side wall form a fifth accommodating cavity; the third inner side wall, the third outer side wall, the fourth outer side wall, the fifth outer side wall, and the sixth inner side wall form a fourth accommodating cavity;The large accommodating cavity consists of a third accommodating cavity, a fifth accommodating cavity, and a fourth accommodating cavity. The fifth accommodating cavity communicates with the third accommodating cavity, and the fifth accommodating cavity also communicates with the fourth accommodating cavity.

2. A butterfly-shaped drop optical cable with two drop units according to claim 1, characterized in that: The first type of introduction unit consists of an introduction sheath, an optical fiber, and two reinforcing members. The cross-section of the introduction sheath is a hexagon with opposite sides parallel. On the cross-section of the introduction sheath, the distance between the pair of parallel sides with the smallest distance is called the width of the first type of introduction unit, and the length between the two vertices with the largest distance is called the height of the first type of introduction unit. The introduction sheath completely covers the optical fiber and the reinforcing members. The optical fiber is located in the center of the introduction sheath. The two reinforcing members and the optical fiber are distributed along the height direction of the first type of introduction unit. The two reinforcing members are located on both sides of the optical fiber. The introduction sheath has a recessed tear in the direction that passes through the center of the optical fiber and is perpendicular to the height of the first type of introduction unit. The first type of introduction unit is located in the first accommodating cavity and the second accommodating cavity.

3. A butterfly-shaped drop cable with two drop units according to claim 2, characterized in that: The second type of introduction unit consists of a protective sleeve body, two reinforcing members, and an optical fiber tape. The optical fiber tape consists of multiple optical fibers arranged in a row without contact between adjacent fibers and an adhesive layer covering all the optical fibers. The protective sleeve body consists of a first protective sleeve, a second protective sleeve, and a third protective sleeve. The third protective sleeve is located between the first and second protective sleeves and is integrated with the first and second protective sleeves. The two reinforcing members are located inside the first and second protective sleeves, respectively, and the optical fiber tape is located inside the third protective sleeve. The second type of introduction unit is located inside the large accommodating cavity.

4. A butterfly-shaped drop optical cable with two drop units according to claim 3, characterized in that: The filling body is composed of a first filling body, a second filling body, and a third filling body. The filling body is an integral structure. The third filling body connects the first filling body and the second filling body located on both sides of the third filling body. The outer edge of the cross-section of the filling body is formed by connecting an arc segment, a first straight segment of the first filling body, a first straight segment of the third filling body, a second straight segment of the third filling body, and a first straight segment of the second filling body. The outer edge of the cross-section of the filling body is a closed structure. The first straight segment of the third filling body is perpendicular to the second straight segment of the third filling body.

5. A butterfly-shaped drop optical cable with two drop units according to claim 4, characterized in that: An insulated wire consists of a conductor and an insulating sheath covering the conductor.

6. A butterfly-shaped drop optical cable with two drop units according to claim 5, characterized in that: On any plane perpendicular to the axis of the butterfly-shaped optical cable: the lengths of the first straight segment of the first filler, the first straight segment of the second filler, the first straight segment of the third filler, and the second straight segment of the third filler are all equal.

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