CN217360409U

CN217360409U - Branch optical cable

Info

Publication number: CN217360409U
Application number: CN202221943175.2U
Authority: CN
Inventors: 姜成成; 李明; 缪威玮; 朱鹏宇
Original assignee: Jiangsu Zhongtian Technology Co Ltd
Current assignee: Jiangsu Zhongtian Technology Co Ltd
Priority date: 2022-07-27
Filing date: 2022-07-27
Publication date: 2022-09-02
Anticipated expiration: 2032-07-27

Abstract

The utility model provides a branch optical cable, which comprises an outer sheath and a plurality of optical fiber units, wherein the optical fiber units are all arranged in the outer sheath in a penetrating way; the optical fiber cable further comprises a tearing rope used for splitting the outer sheath, a mounting groove is formed in the outer sheath, the mounting groove extends along the length direction of the optical fiber cable, the mounting groove penetrates through the inner wall surface, facing the optical fiber unit, of the outer sheath, and the tearing rope extends along the length direction of the optical fiber cable and is fixedly clamped in the mounting groove. The utility model discloses an oversheath is easily peeled off to branch's optical cable.

Description

Branch optical cable

Technical Field

The utility model relates to an optical cable technical field, in particular to branch optical cable.

Background

With the continuous push of fiber to the home, the structure of communication network is becoming diversified, especially the installation condition of optical cable used for connecting various equipments in the building is higher than that of outdoor one, because the indoor installation wiring is limited by indoor space, the size, bending radius and flexibility of the outer diameter of the optical cable are higher, and when entering the connection equipment of each building, stripping and connecting treatment are required.

The existing branch optical cable generally includes an outer sheath and a plurality of optical fiber units disposed in the outer sheath, and a tear cord is disposed in the outer sheath. Thus, when the branch optical cable is stripped, the outer sheath can be outwards split by the tearing rope from the inner wall surface of the outer sheath so as to expose the plurality of optical fiber units on the inner side and carry out splicing treatment.

However, the ripcord makes it difficult to split the outer jacket, resulting in branch cables that are not easily stripped of the outer jacket.

SUMMERY OF THE UTILITY MODEL

The utility model provides a branch optical cable, its oversheath of easily peeling off.

The utility model provides a branch optical cable, which comprises an outer sheath and a plurality of optical fiber units, wherein the optical fiber units are all arranged in the outer sheath in a penetrating way; the optical fiber cable further comprises a tearing rope used for splitting the outer sheath, a mounting groove is formed in the outer sheath, the mounting groove extends along the length direction of the optical fiber cable, the mounting groove penetrates through the inner wall surface, facing the optical fiber unit, of the outer sheath, and the tearing rope extends along the length direction of the optical fiber cable and is fixedly clamped in the mounting groove.

In some alternative embodiments, the depth of the recess of the mounting groove is less than the diameter of the tear string and greater than the radius of the tear string.

In some alternative embodiments, the opening of the mounting slot is sized smaller than the radius of the tear cord.

In some alternative embodiments, the tear cord is configured to be snapped into the mounting channel with a predetermined tension.

In some optional embodiments, the number of the installation grooves is multiple, each installation groove is correspondingly provided with one tearing rope, and the installation grooves are arranged at intervals along the circumferential direction of the branch optical cable.

In some alternative embodiments, the installation grooves are arranged at equal intervals along the circumference of the branch optical cable.

In some optional embodiments, the optical branch cable further includes an inner sheath, the inner sheath is disposed on the outer sides of the plurality of optical fiber units, the outer sheath is disposed on the outer side of the inner sheath, a first reinforcing layer is disposed between the inner sheath and the outer sheath, and a water blocking yarn is embedded in the first reinforcing layer.

In some optional embodiments, the inner sheath is made of a polyvinyl chloride material or a low smoke zero halogen material, and/or the outer sheath is made of a polyurethane material.

In some alternative embodiments, the first reinforcing layer comprises a plurality of reinforcing yarns that are aramid yarns or fiberglass yarns.

In some optional embodiments, the optical drop cable further comprises a central strength member, the central strength member being a non-metallic member, the central strength member extending along a length direction of the optical cable, and the plurality of optical fiber units being arranged along a circumference of the central strength member.

The utility model provides a branch optical cable, through set up the mounting groove on the internal face of overcoat, and to tear the rope card and fix in the mounting groove, thus, when peeling off the oversheath of branch optical cable, the internal face of mounting groove can play limiting displacement to tearing the rope, avoid cutting and split the oversheath in-process, it slides to tear the relative oversheath of rope, and simultaneously, it compresses tightly on the internal face of mounting groove to tear the rope, stress concentration appears in mounting groove internal face department, tear the rope and can use the internal face of mounting groove for cutting apart the initial position and cut and split the oversheath, the oversheath easily cuts and splits.

In addition to the technical problems, technical features constituting technical solutions, and advantageous effects brought by the technical features of the technical solutions described above, other technical problems that can be solved by the branch optical cable provided by the embodiments of the present invention, other technical features included in the technical solutions, and advantageous effects brought by the technical features will be further described in detail in the detailed description of the embodiments of the present invention.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without inventive labor.

Fig. 1 is a schematic structural diagram of a branch optical cable according to an embodiment of the present invention;

fig. 2 is a schematic structural view of the outer sheath in fig. 1.

Description of reference numerals:

10-a drop cable;

100-an outer sheath; 110-a mounting groove;

200-an optical fiber unit; 210-a fiber body; 220-a first coating layer; 230-a second reinforcement layer; 240-a second cladding layer;

300-tear string;

400-an inner sheath;

500-a first reinforcement layer;

600-water blocking yarn;

700-central stiffener;

800-wrapping tape.

Detailed Description

In order to make the above objects, features and advantages of the embodiments of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is obvious that the described embodiments are only some of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by a person skilled in the art without creative efforts all belong to the protection scope of the present invention.

As described in the background, splicing of drop cables requires a stripping operation to expose the fiber units within the drop cable. However, when the outer sheath is stripped off, the tearing rope usually acts on the smooth inner wall surface of the outer sheath, so that the tearing rope easily slides relative to the outer sheath, and the outer sheath is difficult to split by the tearing rope, that is, the outer sheath is difficult to strip off in the existing branch optical cable.

In view of this, the utility model provides a branch optical cable, through set up the mounting groove on the internal face of overcoat, and will tear the rope card and fix in the mounting groove, like this, when peeling off the oversheath of branch optical cable, the mounting groove can regard as limit structure to tear the rope and carry on spacingly, avoid tearing the relative oversheath of rope and slide, and simultaneously, it acts on the internal face of mounting groove to tear the rope, stress concentration appears easily on the internal face of mounting groove, the tearing notch can be cut apart to the mounting groove constitution, so that continue to cut apart the overcoat through tearing the rope, that is to say that the branch optical cable that this embodiment provided easily peels off the oversheath.

The structure of the branch optical cable of the present invention will be further explained with reference to the specific drawings.

Examples

Fig. 1 is a schematic structural diagram of a branch optical cable according to an embodiment of the present invention. Fig. 2 is a schematic structural view of the outer sheath in fig. 1.

Referring to fig. 1 and 2, the present invention provides a branch optical cable 10, which includes an outer sheath 100 and a plurality of optical fiber units 200, the number of the optical fiber units 200 can be set as required, for example, the number of the optical fiber units 200 is 2-25, the plurality of optical fiber units 200 are all inserted into the outer sheath 100, the outer sheath 100 can be made of polyurethane or a mixture of polyurethane and polyvinyl chloride, and has better wear resistance and corrosion resistance, so that the optical fiber units 200 can be protected by the outer sheath 100.

In some embodiments, the optical fiber unit 200 includes an optical fiber body 210, a first cladding layer 220, a second reinforcing layer 230, and a second cladding layer 240. The fiber body 210 is used to implement communication.

The first cladding layer 220 is coated on the outer wall surface of the optical fiber body 210, and the material of the first cladding layer 220 may be flame retardant polyvinyl chloride, low smoke halogen-free flame retardant polyolefin, polyurethane, or the like.

The second reinforcing layer 230 is coated outside the first coating layer 220, and the second reinforcing layer 230 may include aramid yarn or glass fiber yarn to improve tensile properties of the branch optical cable 10. Taking aramid yarn as an example, the linear density of the aramid yarn can be greater than or equal to 6110 dtex. The second reinforcing layer 230 may further have water blocking yarns embedded therein, and the expansion rate of the water blocking yarns may be greater than or equal to 70ml/g/min, so as to form a better water blocking effect on the optical fiber body 210.

The second cladding layer 240 is coated on the outer side of the second reinforcing layer 230, the material of the second cladding layer 240 may be polyvinyl chloride, low-smoke halogen-free flame retardant polyolefin, and the like, and the elongation and flexibility are good, for example, the elongation at break may be greater than or equal to 210%, so that the optical fiber unit 200 has good tensile resistance and is easy to bend.

In some embodiments, the plurality of optical fiber units 200 may also be positioned by the wrapping tape 800, and the wrapping tape 800 may be a water-blocking wrapping tape to improve the water-blocking performance of the optical drop cable 10. In some embodiments, the wrapping tape 800 may be wrapped around the outside of the plurality of optical fiber units 200 in a spiral wrapping manner to improve the roundness of the branched optical cable 10, and at this time, the overlapping width of the wrapping tape 800 may be less than or equal to 0.15mm to facilitate the over-molding of the wrapping tape 800.

In some embodiments, the thickness of the wrapping tape 800 may be less than or equal to 0.15mm to avoid unduly increasing the outer diameter dimension of the drop cable 10.

In some embodiments, the drop cable 10 further includes a ripcord 300 for splitting the outer jacket 100, and the ripcord 300 may be made of aramid yarn or polyester yarn. In this embodiment, the material of tearing rope 300 can be aramid yarn, and aramid yarn's density is less, can not show the weight that increases branch optical cable 10, and aramid yarn's tensile modulus is higher, and breaking strength is higher, avoids tearing rope 300 fracture. Meanwhile, the aramid yarn has a low shrinkage at a high temperature, i.e., the ripcord 300 has a high flame-retardant and fire-resistant performance.

In some embodiments, the outer jacket 100 is provided with a mounting groove 110, the mounting groove 110 extends along the length direction of the branch optical cable 10, that is, the mounting groove 110 is a strip-shaped groove extending along the length direction of the branch optical cable 10, the mounting groove 110 penetrates through an inner wall surface of the outer jacket 100 facing the optical fiber unit 200, that is, the mounting groove 110 has an opening on the inner wall surface of the outer jacket 100, and the opening of the mounting groove 110 also extends along the length direction of the branch optical cable 10.

Wherein the ripcord 300 extends in the length direction of the branch optical cable 10 and is clamped in the mounting groove 110. Thus, the ripcord 300 can be fixed on the outer sheath 100 through the mounting groove 110, and the ripcord 300 is prevented from being deviated or bent relative to the outer sheath 100 during the use of the branch optical cable 10.

And in the process of peeling off the outer sheath 100, the tearing rope 300 is pressed on the inner wall surface of the mounting groove 110, at the moment, the mounting groove 110 can also limit the tearing rope 300, and the tearing rope 300 is prevented from sliding relative to the outer sheath 100. In this way, in the process of peeling off the outer sheath 100, the tearing rope 300 is dragged by an external force, the tearing rope 300 can be intensively pressed at a certain position of the inner wall surface of the installation groove 110, and stress concentration is likely to occur at the position, at this time, the tearing rope 300 plays a cutting role, and the outer sheath 100 is divided by taking the position of the installation groove 110 as a division starting position. That is, by providing the mounting groove 110 and fastening the ripcord 300 on the mounting groove 110, the mounting groove 110 can form a splitting tear so as to facilitate the splitting of the outer sheath 100 by the ripcord 300, and the optical drop cable 10 can be easily stripped off the outer sheath 100.

In some embodiments, to facilitate the division of the outer jacket 100, a dividing groove (not shown) may be provided on an outer wall surface of the outer jacket 100, the dividing groove extending along a length direction of the branch optical cable 10 and penetrating through the outer wall surface of the outer jacket 100, and the dividing groove and the mounting groove 110 are provided in correspondence to a radial direction of the branch optical cable 10.

In some embodiments, the cross-sectional shape of the dividing groove may be circular arc, U-shaped, V-shaped, or the like.

In some optional embodiments, in order to protect the optical fiber units 200, the optical branch cable 10 further includes an inner sheath 400, the inner sheath 400 is sleeved outside the optical fiber units 200, the outer sheath 100 is sleeved outside the inner sheath 400, the inner sheath 400 is made of a polyvinyl chloride material or a low smoke and zero halogen material, and the extension and flexibility of the inner sheath are high, so that the optical branch cable 10 has high bending strength and tensile strength. That is, the outer side of the optical fiber unit 200 is jacketed with a double-layer jacket, and the branch cable 10 can provide better protection for the optical fiber unit 200.

In some embodiments, a first reinforcing layer 500 is disposed between the inner jacket 400 and the outer jacket 100, wherein the first reinforcing layer 500 comprises a plurality of reinforcing yarns, which may be aramid yarns or fiberglass yarns, to improve the tensile and pressure resistance of the drop cable 10.

In some embodiments, a water blocking yarn 600 may also be embedded within the first reinforcing layer 500. The water-blocking yarn 600 has a predetermined tensile strength and elongation, and the water-blocking yarn 600 contains an expanded fiber or an expanded powder of polyacrylate, which expands after absorbing water, so as to achieve the longitudinal water-blocking effect of the branched optical cable 10.

In some embodiments, the number of the water blocking yarn 600 may be one or more, and the number of the water blocking yarn 600 is not limited in this embodiment.

It is understood that the recess depth of the mounting groove 110 may be greater than or equal to the diameter of the ripcord 300, so that the ripcord 300 does not protrude from the inner wall surface of the outer jacket 100 in the cross-section of the branch optical cable 10 when the ripcord 300 is clamped in the mounting groove 110.

In some alternative embodiments, the depth of the recess of the mounting slot 110 is less than the diameter of the rip cord 300 and greater than the radius of the rip cord 300. Thus, when the ripcord 300 is caught in the mounting groove 110, a part of the ripcord 300 protrudes from the inner wall surface of the outer jacket 100, and a part of the ripcord 300 protruding from the inner surface of the outer jacket 100 is compressed and compressed between the first reinforcing layer 500 and the outer jacket 100 in the cross section of the branched optical cable 10.

Wherein, considering that the larger the gap between the inner sheath 400 and the outer sheath 100 is, the greater the difficulty of water blocking is, the gap between the inner sheath 400 and the outer sheath 100 is not generally too large. However, when the gap between inner sheath 400 and outer sheath 100 is small, there is a risk of mutual contact between inner sheath 400 and outer sheath 100. Therefore, the inner sheath 400 and the outer sheath 100 may be spaced apart from each other by the arrangement of the partial tear string 300 protruding from the inner wall surface of the outer sheath 100.

Meanwhile, since the hardness of the ripcord 300 is less than that of the outer sheath 100, a portion of the ripcord 300 protruding from the inner wall surface of the outer sheath 100 is generally deformed by pressure, and a deformation amount of the outer sheath 100 at a position corresponding to the ripcord 300 is small, that is, a deformation amount of the outer wall surface of the outer sheath 100 at a position corresponding to the ripcord 300 is small, which has a small influence on the roundness of the branched optical cable 10.

Furthermore, since the ripcord 300 is compressed between the outer sheath 100 and the first reinforcing layer 500, the ripcord 300 can be pressed against the mounting groove 110 by the first reinforcing layer 500, thereby preventing the ripcord 300 from being displaced.

It will be appreciated that the opening of the mounting slot 110 may be sized to be greater than or equal to the diameter of the rip cord 300 to facilitate installation of the rip cord 300 into the mounting slot 110.

In some alternative embodiments, the opening size of the mounting slot 110 is smaller than the radius of the rip cord 300. Thus, when the tear string 300 is installed, the tear string 300 may be compressed and deformed and extend into the installation groove 110 through the opening of the installation groove 110, or the tear string 300 may also extend into the installation groove 110 through the end of the installation groove 110 in the longitudinal direction thereof.

Because the opening of the installation groove 110 is smaller than the radius of the tearing rope 300, when the tearing rope 300 is clamped and fixed in the installation groove 110, the opening of the installation groove 110 can play a role in clamping and fixing the tearing rope 300, and the fixing stability of the tearing rope 300 is high.

In some embodiments, the cross-sectional shape of the mounting groove 110 may be circular arc, U-shaped, V-shaped, or the like. When the tear string 300 is fastened in the mounting groove 110, a portion of the tear string 300 located in the mounting groove 110 may abut against an inner wall surface of the mounting groove 110, and it can be understood that an outer wall surface of the portion of the tear string 300 located in the mounting groove 110 may partially or entirely abut against the inner wall surface of the mounting groove 110.

For example, when the cross-sectional shape of the mounting groove 110 is a circular arc, and the radius of the circular arc is equal to or slightly smaller than the radius of the ripcord 300, the outer wall surface of the portion of the ripcord 300 located in the mounting groove 110 may be entirely attached to the inner wall surface of the mounting groove 110. When the cross-sectional shape of the mounting groove 110 is U-shaped, and the width of the U-shaped mounting groove 110 is smaller than the diameter of the mounting groove 110, and the depth of the recess of the U-shaped mounting groove 110 is greater than the diameter of the tearing string 300, the bottom wall of the U-shaped mounting groove 110 may not contact with the tearing string 300.

Considering that the rip cord 300 is freely installed in the installation groove 110, the rip cord 300 may be bent or a portion of the rip cord 300 may protrude to the outside of the installation groove 110. In some alternative embodiments, the tear string 300 is configured to be clamped in the installation groove 110 with a preset tension, wherein the preset tension can be set according to the requirement, and the embodiment is not limited.

By placing the rip cord 300 in tension, the rip cord 300 can be stably installed in the installation groove 110. Meanwhile, the roundness of the optical drop cable 10 may be adjusted within a certain range, that is, even if the roundness of the optical drop cable 10 is changed due to irregular distribution of the plurality of optical fiber units 200 or due to the arrangement of the ripcord 300 protruding from the inner wall surface of the outer jacket 100, the roundness of the optical drop cable 10 may be finely adjusted by the tension of the ripcord 300. Further, by placing the ripcord 300 under tension, the tensile strength of the optical drop cable 10 can be improved.

The number of the mounting grooves 110 may be one, and a tearing rope 300 is correspondingly clamped and fixed in the mounting groove 110. The mounting groove 110 may be provided at any position of the outer sheath 100 in the circumferential direction thereof.

In some alternative embodiments, in order to facilitate peeling off the outer sheath 100, the number of the installation grooves 110 may be multiple, for example, two, three or more, each installation groove 110 is correspondingly provided with one ripcord 300, and the installation grooves 110 are arranged at intervals along the circumferential direction of the branch cable 10. As such, when outer jacket 100 is peeled, outer jacket 100 may be segmented into multiple portions by plurality of tear cords 300 to facilitate peeling of outer jacket 100.

It can be understood that, the ripcord 300 is clamped in the mounting groove 110, and when part of the ripcord 300 protrudes out of the inner wall surface of the outer sheath 100, a corresponding protrusion may be formed at a position of the outer wall surface of the outer sheath 100 corresponding to the ripcord 300, which may cause a large change in the maximum outer diameter of the branch optical cable 10, and therefore, too many ripcords 300 are not suitable to be disposed, so as to avoid affecting the roundness of the branch optical cable 10. For example, in the present embodiment, the number of the mounting grooves 110 may be two or three, and correspondingly, the number of the tear string 300 is two or three.

It is understood that, in order to facilitate splitting of the outer jacket 100 to peel off the outer jacket 100, when the branch optical cable 10 is provided with the plurality of ripcords 300, a crossing condition between the plurality of ripcords 300 may not occur to avoid a condition in which the outer jacket 100 is not torn.

In some embodiments, a plurality of ripcords 300 are disposed generally in parallel to facilitate assembly of drop cable 10. Then, in the present embodiment, by providing the mounting groove 110 and clamping the tearing rope 300 in the mounting groove 110, the tearing rope 300 can be maintained in a parallel state as long as the plurality of mounting grooves 110 are parallel to each other. Compared to the prior art in which a plurality of tear strings 300 are disposed inside the outer sheath 100, the present embodiment is easier to maintain the tear strings 300 in a parallel state to each other so as to facilitate the separation and peeling of the outer sheath 100.

When the number of the mounting grooves 110 is plural, the mounting grooves 110 may be disposed at any position of the outer sheath 100 along the circumferential direction thereof, that is, the circumferential distance between any two adjacent mounting grooves 110 may be different. For example, when the number of the mounting grooves 110 is two, the angle of a line connecting the centers of the two mounting grooves 110 and the center of the branch cable 10 may be 90 ° in the cross-section of the branch cable 10.

In some alternative embodiments, the plurality of mounting slots 110 are arranged at equal intervals along the circumference of the branch cable 10. For example, when the number of the mounting grooves 110 is two, the center of the branch cable 10 is located on a line connecting the centers of the two mounting grooves 110 in the cross-section of the branch cable 10. This allows the outer sheath 100 to be equally divided into multiple sections to facilitate separation and peeling.

In some alternative embodiments, where drop cable 10 further includes a central strength member 700, the cross-sectional shape of central strength member 700 may be rectangular, circular, oval, or other shape. The cross-sectional size of the central strength member 700 may be larger or smaller than the outer diameter of the optical fiber unit 200, or the outer diameter of the central strength member 700 may be comparable to the outer diameter of the optical fiber unit 200, depending on the size of the drop cable 10.

In some embodiments, the central strength member 700 is a non-metallic member such that the weight of the drop cable 10 is low, while the non-metallic member is easily bent, which may provide the drop cable 10 with greater bending strength. The non-metallic member may be made of Glass Fiber Reinforced Plastic (GFRP), and the central reinforcement member 700 may also be made of a composite material, such as a low smoke zero halogen sheath or a polyvinyl chloride sheath, which is covered on the outer side of the GFRP. For example, the diameter of the glass fiber reinforced plastic can be 0.8mm-3 mm.

In some embodiments, the central strength member 700 extends along the length of the cable, and the plurality of optical fiber units 200 are arranged along the circumference of the central strength member 700. In this way, the central strength members 700 can be more uniformly arranged along the circumference of the branch cable 10, and the roundness of the branch cable 10 is higher.

In some embodiments, the plurality of optical fiber units 200 may be stranded outside the central strength member 700, so that the central strength member 700 and the plurality of optical fiber units 200 may be integrated into a single unit, and the branch cable 10 has high strength.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "comprises" and "comprising," and any variations thereof, as used herein, are intended to cover a non-exclusive inclusion, such that a process, method, display structure, product, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, product, or apparatus.

Unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integral to one another; either directly or indirectly through intervening media, such as through internal communication or through an interaction between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims

1. The branch optical cable is characterized by comprising an outer sheath and a plurality of optical fiber units, wherein the optical fiber units are arranged in the outer sheath in a penetrating manner;

the optical fiber cable further comprises a tearing rope for cutting the outer sheath, a mounting groove is formed in the outer sheath, the mounting groove extends along the length direction of the optical fiber cable, the mounting groove penetrates through the inner wall surface, facing the optical fiber unit, of the outer sheath, and the tearing rope extends along the length direction of the optical fiber cable and is fixedly clamped in the mounting groove;

the opening size of the mounting groove is smaller than the radius of the tearing rope;

the tear cord is configured to be snapped into the mounting channel with a predetermined tension.

2. The optical drop cable of claim 1, wherein the mounting groove is recessed to a depth less than the diameter of the ripcord and greater than the radius of the ripcord.

3. The optical branch cable according to claim 1 or 2, wherein the plurality of installation grooves are provided, each installation groove is provided with one tearing rope correspondingly, and the plurality of installation grooves are arranged at intervals along the circumferential direction of the optical branch cable.

4. The optical drop cable of claim 3, wherein the mounting grooves are arranged at equal intervals along a circumference of the optical drop cable.

5. The optical branch cable according to claim 1 or 2, further comprising an inner sheath, wherein the inner sheath is disposed on the outer side of the plurality of optical fiber units, the outer sheath is disposed on the outer side of the inner sheath, a first reinforcing layer is disposed between the inner sheath and the outer sheath, and a water blocking yarn is embedded in the first reinforcing layer.

6. The optical branch cable according to claim 5, wherein the inner sheath is made of polyvinyl chloride or low smoke zero halogen, and/or the outer sheath is made of polyurethane.

7. The drop cable of claim 5, wherein the first reinforcing layer includes a plurality of reinforcing yarns, the reinforcing yarns being aramid yarns or fiberglass yarns.

8. The branch cable according to claim 1 or 2, further comprising a central strength member which is a non-metallic member and extends along a length of the cable, wherein the plurality of optical fiber units are arranged along a circumference of the central strength member.