KR20220051570A - Optic Cable - Google Patents

Abstract

The present invention relates to an optical cable. In more detail, the optical cable is used for indoor or outdoor entry, minimizes the outer diameter to be suitable for processing and installation in pipelines, minimizes the optical loss due to the stress applied to the optical fiber accommodated in an optical unit, and has excellent peelability and tensile strength.

Description

Optical Cable {Optic Cable}

The present invention relates to an optical cable. More specifically, the present invention is used for a purpose of being dropped indoors or outdoors from a hypothesized optical cable, the outer diameter is minimized to be suitable for processing and installation in the pipeline, and the light caused by the stress applied to the optical fiber accommodated in the optical unit It relates to an optical cable that minimizes loss, is easy to peel off, and has excellent tensile strength.

Optical cables are a large-capacity signal transmission means in various communication networks, and can constitute a high-speed communication network.

Optical cables are classified in various ways according to their structure and usage environment. Among them, fiber drop cables are cables that branch off from optical distribution boxes when entering each home, office, or building via a utility pole.

Fig. 1 shows a cross-sectional view of one embodiment of a conventional optical cable for pulling-in, and Fig. 2 shows a cross-sectional view of another embodiment of a conventional optical cable for pulling-in.

The lead-in optical cable shown in FIG. 1 is largely composed of a cable body (B) and a support (S) for supporting the cable body. The cable body B includes a sheath layer 40a mainly made of a polyolefin-based thermoplastic resin, an optical fiber 11 inserted in the sheath layer 40a, and mutually symmetrical with respect to the optical fiber 11 . and a reinforcing member 20a made of a metal or non-metal material disposed as In addition, a notch 43 may be formed in the sheath layer 40a on both sides of the portion where the optical fiber 11 is disposed to facilitate peeling. Each of the sheath layers may be connected and integrally formed.

And, the support part (S) comprises a wire member 70 serving as a support wire and a sheath layer 40b in which a polyolefin-based thermoplastic resin is coated on the wire member 70, and one end of the sheath layer 40b It can be connected to the cable body (C) in a partitioned state by the partition 41 formed in the. Here, the partition part 41 has a narrow and constricted shape to facilitate fixing of the cable support structure.

As such, the lead-in optical cable shown in FIG. 1 has an asymmetrical structure rather than a circular cross-sectional shape, so there is a bending direction characteristic when an optical cable is installed or a drum is wound. Damage to the optical fiber may occur, and there is a problem that the weight, volume, and cost of the optical cable may be increased. In addition, since the lead-in optical cable shown in FIG. 1 has a structure capable of accommodating two optical fibers 11 therein, it may be difficult to satisfy the demand of buildings for collective residence.

As another embodiment, in the lead-in optical cable shown in FIG. 2 , the cable body B may include an optical fiber 11 inside the tight buffer layer 13 in the form of a tight buffer, and tension the outside of the tight buffer layer 13 . It may have a structure in which a fiber layer is wrapped around and finished with a sheath layer again.

Similarly, a plurality of wire members 70 of a steel wire or a stranded wire may be provided in the support portion S, and the wire member 70 may be covered by a sheath layer 40b. Each of the sheath layers may be connected and integrally formed.

Since the optical cable for lead-in shown in FIG. 2 also has a non-circular cross-section, there is a problem in that there is a bending direction characteristic when the optical cable is installed or the drum is wound, and the weight, volume, and cost of the optical cable can be increased. Since the optical cable for use has a structure capable of accommodating two optical fibers 11 therein, it may be difficult to satisfy the demand of buildings for collective residence.

As shown in FIGS. 1 and 2, in the case of the conventionally introduced optical cable for lead-in, a notch is formed in the cable jacket to facilitate cable stripping, or a separate support part in which a reinforcing member or a wire member is embedded, etc. It is composed of an asymmetric shape rather than a circular shape, so there is a limitation in the direction of bending, and products with a large volume and weight of the cable are mainly products.

In addition, conventional lead-in optical cables are configured in a manner of directly inserting or terminating an optical fiber in the sheath layer of FIG. 1 or the tight buffer layer of FIG. In this case, the pressure is transmitted to the optical fiber as it is, and there is a problem in that the optical loss value is greatly increased.

In addition, in conventional optical cables for lead-in, moisture penetration is easy when a crack occurs in the cable jacket or sheath layer or tight buffer layer, but there is often no preparation for waterproofing. It is difficult to satisfy fire-related safety standards that are reinforced with optical cables for entering indoors because they are vulnerable to fire and do not consider additional flame retardancy.

Therefore, in order to solve the above problems occurring in the conventionally introduced optical cable for lead-in, it is used for indoor or outdoor use, and the outer diameter is minimized to facilitate installation and work through a narrow and complicated pipeline, and the cross section is An optical cable with a circular shape, which minimizes optical loss due to stress applied to the received optical fiber, and has excellent peelability and tensile strength is required.

The present invention is used for indoor or outdoor use, the outer diameter is minimized to be suitable for processing and installation in the pipeline, the damage to the optical fiber due to the stress applied to the optical fiber accommodated in the optical unit is minimized, and the peeling operation is easy and tensile It is a task to be solved to provide an optical cable with excellent strength.

In order to solve the above problems, the present invention provides an optical unit comprising one or more optical fibers and a tube member in which the optical fibers are accommodated; a reinforcing layer surrounding the optical unit; and

and a sheath layer surrounding the outside of the tensile fiber layer, wherein the ratio of the total cross-sectional area of the optical unit and the reinforcing layer to the inner cross-sectional area of the sheath layer is 68% to 85%.

In addition, the reinforcing layer may include a tensile fiber layer composed of tensile fibers such as aramid yarn and glass yarn.

In addition, the reinforcing layer may include a waterproofing layer composed of a waterproofing material such as waterproofing tape, waterproofing powder, and waterproofing yarn.

Here, the outer diameter of the sheath layer may be 3.6 millimeters to 4.4 millimeters (mm).

In this case, the tube member and the sheath layer of the optical unit may be made of a low smoke zero halogen (LSZH) material.

And, the outer diameter of the optical unit may be 0.9 millimeters to 1.6 millimeters (mm).

In addition, the tube member may be made of a soft low smoke zero halogen (LSZH) material, and the thickness of the tube member may be 0.1 to 0.2 millimeters (mm).

In addition, at least one reinforcing member may be embedded in the sheath layer.

Here, the sheath layer may be composed of an LSZH composition having an oxygen index of 40% or more.

In this case, an outer tensile fiber layer surrounding the outer side of the sheath layer; and a cable jacket surrounding the outside of the outer tensile fiber layer and made of a high density polyethylene (HDPE) or medium density polyethylene (MDPE) material.

And, the outer diameter of the cable jacket may be 5.1 millimeters to 6.3 millimeters (mm).

In addition, at least one reinforcing member may be embedded in the cable jacket.

Here, the reinforcing member may be formed of a wire of a fiber-reinforced plastic (FRP) material having a circular, oval, or polygonal cross-section.

In this case, the reinforcing member may be coated with ethylene acrylic acid (EAA).

In addition, the optical fiber may include 1 to 12 thin optical fibers having a diameter of 180 μm to 220 μm or general optical fibers having a diameter of 230 μm to 270 μm.

According to the optical cable according to the present invention, since the optical cable is configured in a circular shape and the overall outer diameter is minimized, miniaturization and weight reduction are possible. While light loss due to stress is minimized, it is very suitable for processing and installation in indoor or outdoor pipelines because of its excellent peeling and tensile strength.

In addition, according to the optical cable according to the present invention, since the sheath layer surrounding the optical unit is made of a flame-retardant material, the flame-retardant property of the optical cable is further improved, and a waterproofing material is provided inside the optical unit for the lead-in optical cable to be drawn in outdoors, etc. A waterproof characteristic can be secured.

Fig. 1 shows a cross-sectional view of one embodiment of a conventional optical cable for pulling-in, and Fig. 2 shows a cross-sectional view of another embodiment of a conventional optical cable for pulling-in.
3 shows a cross-sectional view of one embodiment of an optical cable according to the present invention;
4 shows a cross-sectional view of another embodiment of an optical cable according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein and may be embodied in other forms. Rather, the embodiments introduced herein are provided so that the disclosed subject matter may be thorough and complete, and the spirit of the invention may be sufficiently conveyed to those skilled in the art. Like reference numbers refer to like elements throughout.

3 shows a cross-sectional view of one embodiment of an optical cable 100A according to the present invention.

Looking more specifically with reference to FIG. 3 , the optical cable 100A according to the present invention includes an optical unit 10 including one or more optical fibers 11 and a tube member 13 in which the optical fibers 11 are accommodated, the optical It may be configured to include a tensile fiber layer 20 surrounding the unit and made of tensile fibers, and a sheath layer 40 surrounding the outside of the tensile fiber layer 20 .

The optical cable 100A shown in FIG. 3 is designed to be small in size with an optical cable overall outer diameter (D1) of 3.6 mm to 4.4 mm (mm), so it is a cable for branching and entering from an indoor distribution box to a terminal box arranged indoors. Suitable.

In the optical unit 10 disposed in the center of the optical cable 100A according to the present invention, at least one optical fiber 11 may be accommodated therein, and the tube member 13 in which the optical fiber 11 is accommodated is the It protects the optical fiber 11 and performs a waterproof function and a function of absorbing external shock. In addition, the optical unit 10 may further include a waterproof yarn 15 as a waterproofing material inside the tube member 13 to further prevent the moisture penetrating into the optical fiber 11 from damaging the optical fiber 11 . .

In the optical cable 100A shown in FIG. 3 , the optical unit 10 is illustrated as including four optical fibers 11 , but the optical unit 10 includes, for example, 1 to 12 optical fibers 11 . may include

In addition, the outer diameter d of the optical unit 10 and the thickness of the tube member 13 may be variously set or changed according to the number of optical fibers 11 accommodated in the optical unit 10 .

Preferably, the outer diameter (d) of the optical unit 10 is 0.9 millimeters to 1.6 millimeters (mm), and the thickness of the optical unit 10 tube member is 0.1 millimeters to 0.2 millimeters (mm) in the present invention While satisfying the outer diameter range required for the optical cable according to It was confirmed that it can be obtained.

The optical fiber 11 constituting the optical unit 10 has a double column structure in which a part called a cladding usually surrounds a part called a core in the center, where the core uses a glass optical fiber made of silica with a high refractive index, and the cladding uses a glass or synthetic resin made of silica having a relatively lower refractive index than the core, so that the light passing through the center is totally reflected. It is implemented to play a role in transmitting a signal.

The optical fiber 11 constituting the optical unit 10 may use a narrow optical fiber having an outer diameter of 180 micrometers to 220 micrometers (μm) or a general optical fiber having an outer diameter of 230 micrometers to 270 micrometers (μm).

The tube member 13 of the optical unit 10 may be made of a soft LSZH (Low Smoke Zero Halogen) material. Compared to polymer resins such as polyethylene (PE), polybutylene terephthalate (PBT), or polypropylene (PP), which have been relatively widely used as optical unit tube members, LSZH material has more tearing or breaking properties than stretching properties. Therefore, in the optical branching or optical connection operation, the waterproof yarn 15 accommodated in the tube member 13 is cut using a rip cord, or if necessary, the tube member 13 is torn by hand without a separate tool at the connection site. Because it is easy to use, workability can be improved, and it is more suitable for indoor products by having flame retardant properties.

The tensile fiber layer 20 is provided on the outside of the optical unit 10 to reinforce the tensile strength of the optical cable, and the tensile fiber layer 20 is an aramid yarn or a glass yarn having excellent tensile properties. Tensile fibers such as, preferably, aramid yarns may be provided in a transverse winding or longitudinal state inside the sheath layer 40 .

In addition, the tensile fibers constituting the tensile fiber layer 20 may be configured to be longitudinally or twisted in the S-Z direction around the optical unit 10, and the total input amount according to the installation environment required for the optical cable according to the present invention, etc. can be decided.

The tensile fiber layer 20 minimizes various stresses such as compressive force and friction force applied to the optical unit 10 when the optical cable is drum-wound or installed indoors and outdoors to prevent optical loss due to physical damage to the optical fiber 11 . Or it is minimized and serves to secure tensile strength.

In addition, the optical cable according to the present invention may further include a waterproof layer 30 between the tensile fiber layer 20 and the sheath layer 40 . The waterproof layer 30 may be made of a waterproof material such as a waterproof tape, waterproof powder, waterproof yarn, such as a paper swelling tape (swellable tape), and the moisture penetrating through the damaged part of the sheath layer 40 penetrates into the optical cable. It may perform a function of suppressing the tension, and the tensile fiber layer 20 may also perform a binding function of tying fibers for tension in order to maintain a circular shape.

The tensile fiber layer 20 and the waterproof layer 30 may serve as a reinforcing layer for protecting the optical unit.

On the other hand, when the amount (or density) of tensile fibers per unit area of the tensile fiber layer 20 exceeds an appropriate value, in particular, the tensile fiber layer 20 and the sheath layer 40 are extruded during the manufacture of the optical cable. Accordingly, it was confirmed that the pressure applied to the optical unit 10 was increased, so that the optical fiber 11 inside was damaged or the optical loss characteristic due to bending (Micro/Macro Bending) was reduced.

Therefore, when the cross-sectional area of the inner space of the sheath layer 40 of the optical cable according to the present invention is 85% or less, preferably, the area area is 68 to 85%, the sheath layer 40 is extruded In the process, an empty space is appropriately formed inside the sheath layer 40, and the tensile fiber layer 20 sufficiently protects the optical unit 10, but unnecessarily presses it to cause damage, optical loss, or optical fiber bending (Micro/Macro bending). ) was confirmed to be able to prevent

If the cross-sectional area ratio is less than 68%, the tube member and the sheath layer are attached during the extrusion process, and when the sheath layer is peeled off at the connection site, it may be difficult to separate the optical unit 10 and the sheath layer 40, and the attachment state It was confirmed that there is a risk of optical loss or damage to the optical fiber due to the increase in stress and stress applied to the optical fiber when bending or laying the optical cable.

On the other hand, when the cross-sectional area ratio is more than 85%, as the optical unit 10 is greatly pressed due to the pressure or stress applied to the optical unit 10 when the sheath layer 40 is extruded, the tube member 13 It was confirmed that there is a problem in that the distance between the inner surface and the optical unit 11 is close to the optical loss is greatly increased. In addition, when the tensile fiber layer 20 is composed of aramid yarn, the amount of relatively expensive aramid yarn is increased, so that the manufacturing cost of the optical cable can be increased unnecessarily.

The optical cable characteristics according to the design conditions of the optical cable according to the space factor (%) of the internal configuration of the sheath layer 40 can be confirmed through the test results in Table 1 below.

Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Example 1 Example 2 Tube member thickness
(mm) 1.1 1.1 1.1 1.1 1.1 1.1 Sheath layer thickness
(mm) 1.2 1.1 0.9 1.1 1.1 1.1 aramid yarn
(den) 9940 5680 9940 9940 9940 7100 waterproof yarn
(den) 4000 4000 4000 6000 4000 4000 total outer diameter
(mm) 4.0 4.0 4.0 4.0 4.0 4.0 occupancy rate
(%) 101.43 67.22 53.65 86.47 80.14 71.53 optical properties error Good Instability Instability Good Good Tube-Sheath Adhesion non-occurring partial occurrence partial occurrence non-occurring non-occurring non-occurring Ease of sheath removal somewhat difficult Good Good Good Good Good Exterior Good Good error Good Good Good

As shown in Table 1, in Comparative Examples 1 to 4 and Examples 1 to 2, the thickness of the sheath layer 40 and the density of the aramid yarn (tensile fiber) or waterproof yarn (waterproof material) accommodated in the tensile fiber layer 20 were changed. The test was performed by changing the internal space factor of the sheath layer calculated by the following equation.

- under -

Sheath layer inner space ratio = (optical unit cross-sectional area + tensile fiber equivalent cross-sectional area + waterproofing material equivalent) / sheath layer inner cross-sectional area

Light unit cross-sectional area = π·(Light unit outer diameter/2) ²

Tensile fiber conversion cross-sectional area = (aramid yarn [Den]/9000)/1.44 (aramid yarn density) * number of strands

Converted cross-sectional area of waterproofing material = (waterproof yarn[Den]/9000)/1.38(PET density)*number of strands

Sheath layer inner cross-sectional area = π·(sheath layer inner diameter/2) ²

As shown in Table 1, in the case of Comparative Example 1 and Comparative Example 4, it was confirmed that the optical transmission characteristics were commonly lowered, and the tensile fiber provided in the tensile fiber layer was input too much, so that the tube member 13 was pressed and the tube It is determined that the optical loss due to the mutual contact between the member 13 and the optical fiber 11 is increased.

Also, in Comparative Example 1, when the tensile fibers were excessively added to the tensile fiber layer and the sheath layer was peeled off, the peeling operation was difficult due to friction between the tensile fiber layer and the sheath layer.

Comparative Example 2 decreased the density of the aramid yarn, and Comparative Example 3 decreased the thickness of the sheath layer. As a result, the adhesion between the sheath layer 40 and the tube member was partially confirmed, and tube damage occurred at the bonding portion when the sheath was peeled off, and it is expected that there is a risk of optical loss during tension and bending of the optical cable.

In addition, in the case of Comparative Example 3, relatively few aramid yarns and waterproof yarns were put into the inner space between the sheath layer and the tube member, so that a section in which the cross-sectional appearance of the sheath layer could not maintain a circular shape occurred.

In addition to the above test, additional tests were performed through various combinations of the thickness of the sheath layer and the number and thickness of tensile fibers. It was confirmed that all of the optical transmission characteristics, the peeling properties of the sheath layer 40, and the optical cable appearance characteristics were all excellently expressed.

And, in order to improve the overall flame retardant properties of the optical cable according to the present invention, the sheath layer 40 is made of a halogen-free (Low smoke zero halogen; LSZH) material, and in this case, the oxygen index of the sheath layer 40 is It may be more than 40%. Here, the oxygen index refers to the minimum concentration (%) of oxygen required for continuous combustion of a sample ignited in an air flow in which oxygen and nitrogen are mixed.

Accordingly, the optical cable can secure a flame retardancy of grade D or higher based on the CPR (Construction Products Regulation) standard applied in Europe, so that it can have flame retardant properties that can reduce the spread of fire when a fire occurs in a limited space such as a pipeline.

In addition, at least one wire member 70 may be embedded in the sheath layer 40 in the longitudinal direction of the cable, and in this case, a pair of the wire members 70 may be provided at positions symmetrical to each other, , the cross-section of the wire member 70 may be formed in a circular, oval, or polygonal shape.

The wire member 70 may include high-strength fibers, tensile fibers, strands, steel wires, etc., preferably FRP ( Fiber Reinforced Plastic) may be made of wire.

On the other hand, when the wire member 70 embedded in the sheath layer 40 is not sufficiently attached to the inner surface of the buried space of the sheath layer 40 and is not fixed, the sheath layer 40 contracts according to the change in external temperature. In this case, the wire member 70 may not be contracted together according to the amount of shrinkage, causing the cable to be twisted or disconnection of the optical fiber therein.

Accordingly, the surface of the wire member 70 is coated with EAA (Ethylene Acrylic Acid Copolymer Resin) resin so that when the wire member 70 is buried in the sheath layer 40, the wire member 70 and the The sheath layer 40 may be configured to sufficiently adhere to each other.

4 shows another embodiment according to the optical cable 100B according to the present invention. A description that overlaps with the description with reference to FIG. 3 will be omitted.

4, the optical cable 100B according to the present invention includes an optical unit 10 including one or more optical fibers 11 and a tube member 13 in which the optical fibers 11 are accommodated, the optical unit ( 10) an inner tensile fibrous layer 20 surrounding the circumference and composed of tensile fibers, a sheath layer 40 surrounding the outer side of the inner tensile fiber layer 20, an outer tensile fiber layer 50 surrounding the outer side of the sheath layer 40, and The outer tensile fiber layer 50 may be configured to include a cable jacket 60 surrounding the outside.

And, the total outer diameter D2 of the optical cable 100B according to the present invention is designed to be 5.1 millimeters to 6.3 millimeters (mm), and in this case, the outer diameter (d2) of the sheath layer 40 of the optical cable 100B is about 2.5 It may be a millimeter to 3.5 millimeters (mm), and the outer diameter d1 of the light unit 10 may be 0.9 millimeters to 1.6 millimeters (mm), similar to the above-described embodiment.

The optical cable 100B is suitable as a cable for outdoor installation, which is branched from an outdoor distribution box provided on a telephone pole, etc. to a terminal box disposed indoors.

Accordingly, the optical cable 100B may be configured in a form in which physical rigidity is reinforced than the optical cable for indoor use shown in FIG. 3 in order to cope with a harsh outdoor environment.

Accordingly, the cable jacket 60 is provided at the outermost portion of the cable, and the outer tensile fiber layer 50 is provided inside the cable jacket 60 to further strengthen the tensile strength of the optical cable together with the inner tensile fiber layer 20 .

Structure and material of the optical unit 10 constituting the inside of the optical cable 100B, the inner tensile fiber layer 20 surrounding the outside of the optical unit 10, the waterproof layer 30 and the sheath layer 40 and the shape may be the same or similar except for the internal configuration and size conditions of the optical cable 100A shown in FIG. 3, and below, among the internal configurations of the optical cable 100B, the optical cable 100A shown in FIG. 3 ) We will focus on the parts that are not shared with .

The outer tensile fiber layer 50 may also be composed of tensile fibers such as aramid yarn and glass yarn, and preferably composed of aramid yarn having excellent tensile properties. .

The external tensile fiber layer 50 can obtain the effect of further improving the tensile strength of the optical cable and at the same time improving the peelability of the cable jacket 60 .

If the external tensile fiber layer 50 is not provided, the interface between the sheath layer 40 and the cable jacket 60 may be attached. In the process, there is a risk of damage to the optical unit 10, and a problem that the peeled cross section is not smooth occurs.

In addition, the cable jacket 60 is a layer disposed on the outermost part of the optical cable, and protects the internal configuration of the optical cable, and has excellent mechanical properties. High-density polyethylene (HDPE) or medium-density polyethylene (MDPE) It may be made of material.

In addition, the cable jacket 60 may be provided in which the wire member 70 is embedded in the longitudinal direction of the cable. Here, the wire member 70 may be provided in a symmetrical position of the cable jacket 60 instead of being embedded in the sheath layer 40 like the optical cable 100A shown in FIG. 4 . .

Similarly, when the total cross-sectional area (mm ² ) ratio of the internal components of the sheath layer 40 satisfies 85% or less, preferably 68% to 85%, the optical properties of the optical cable 100B are excellent, and the optical unit It was confirmed that interfacial adhesion did not occur between the tube member of (10) and the sheath layer 40, the sheath layer 40 was easily peeled off, and the overall appearance characteristics were good.

Although the present specification has been described with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention as set forth in the claims described below. will be able to carry out Therefore, if the modified implementation basically includes the elements of the claims of the present invention, all of them should be considered to be included in the technical scope of the present invention.

10: optical unit
20, 50: tensile fiber layer
30: waterproof layer
40: sheath layer
60: cable jacket
70: reinforcing member

Claims (15)

an optical unit comprising one or more optical fibers and a tube member in which the optical fibers are accommodated;
a reinforcing layer surrounding the optical unit; and
Including; a sheath layer surrounding the outside of the tensile fiber layer;
The optical cable, characterized in that the ratio of the total cross-sectional area of the optical unit and the reinforcing layer to the inner cross-sectional area of the sheath layer is 68% to 85%. According to claim 1,
The reinforcing layer comprises a tensile fiber layer composed of tensile fibers such as aramid yarn and glass yarn. According to claim 1,
The reinforcing layer comprises a waterproofing layer composed of a waterproofing material such as waterproofing tape, waterproofing powder, and waterproofing yarn. According to claim 1,
The optical cable, characterized in that the outer diameter of the sheath layer is 3.6 millimeters to 4.4 millimeters (mm). The method of claim 1,
The optical cable, characterized in that the tube member and the sheath layer of the optical unit are made of a low smoke zero halogen (LSZH) material. The method of claim 1,
Optical cable, characterized in that the outer diameter of the optical unit is 0.9 millimeters to 1.6 millimeters (mm). According to claim 1,
The tube member is made of a soft low smoke zero halogen (LSZH) material, and the thickness of the tube member is 0.1 to 0.2 millimeters (mm). According to claim 1,
An optical cable, characterized in that at least one reinforcing member is embedded in the sheath layer. The method of claim 1,
The optical cable, characterized in that the sheath layer is composed of an LSZH composition having an oxygen index of 40% or more. According to claim 1,
an outer tensile fiber layer surrounding the outer side of the sheath layer; and
and a cable jacket surrounding the outer tensile fiber layer and made of a high-density polyethylene (HDPE) or medium-density polyethylene (MDPE) material. 11. The method of claim 10,
The optical cable, characterized in that the outer diameter of the cable jacket is 5.1 millimeters to 6.3 millimeters (mm). 11. The method of claim 10,
An optical cable, characterized in that at least one reinforcing member is embedded in the cable jacket. 13. The method of claim 8 or 12,
The reinforcing member is an optical cable, characterized in that it is composed of a wire of a fiber-reinforced plastic (FRP) material of a circular, oval or polygonal cross section. 13. The method of claim 8 or 12,
The optical cable, characterized in that the reinforcing member is coated with ethylene acrylic acid (EAA). The method of claim 1,
The optical fiber is an optical cable, characterized in that 1 to 12 of a narrow optical fiber having a diameter of 180 μm to 220 μm or a general optical fiber having a diameter of 230 μm to 270 μm.

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