KR19980036200A - Single tube fiber optic cable - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs.

The present invention relates to a single tube optical fiber cable that can distribute the tension line of the optical cable to improve the outer diameter and improve the temperature characteristics.

I. The technical problem that the invention is trying to solve.

The present invention is to provide a single-tube optical fiber cable that can minimize the outer diameter of the optical cable because the tension wire is distributed to the optical cable.

All. Summary of the Solution of the Invention.

The present invention includes a tube containing jelly to prevent moisture penetration into the optical cable central axis while including at least one core optical fiber, and a waterproof material and a metal tape to secure the optical fiber characteristics from the external environment and waterproof to the outside of the tube. In the single-tube optical fiber cable structure having a, the outer side of the metal tape is provided with two strands of the host line and at least two strands of the auxiliary tension line for suppressing the tension and shrinkage of the optical cable.

la. Important use of the invention.

Fiber optic cable.

Description

Single tube fiber optic cable.

The present invention relates to an optical fiber cable, and more particularly, to a single tube optical fiber cable that can improve the outer diameter and improve the temperature characteristics by dispersing the tensile line of the optical cable.

In general, the loose tube type is the most commonly used structure of the optical fiber cable, which is a structure in which the loose tube containing the jelly and optical fiber for waterproof purposes is twisted around the center tensile line. In addition, a single tube type loose tube structure in which a single type of loose tube is arranged at the center of the optical fiber cable and a tensile line is arranged side by side at the center line of the cable on both sides of the loose tube is used. It is a structure that is applied to a lot. It has small outer diameter, light weight and economical structure.

Accordingly, the single tube type loose tube optical fiber cable is disclosed in detail in Korean Patent Publication No. 92-10324 (optical fiber cable) as already known, and this configuration is as shown in FIG. Referring to Figure 1 schematically illustrates the structure of a conventional optical fiber cable as follows.

The optical cable is provided with a tube 54 made of a plastic material filled with jelly 52 in an empty space in order to mount at least one optical fiber 50 and prevent moisture from penetrating the surface of the optical fiber 50. A waterproof tape 56 is wound around the outer circumferential surface of the tube 54 to prevent moisture from penetrating in the longitudinal direction of the optical cable. In addition, the outer circumferential surface of the waterproof tape 56 is surrounded by a copolymer coated steel strip 58 to protect the optical fiber 50 from the external environment.

In addition, a lip cord 62 is placed on the outside of the steel strip 58 to facilitate stripping of the optical cable, and two tensile wires 64 made of steel are placed on the outside of the steel strip 58. It is installed at intervals of 180 degrees. At this time, the tension line 64 is provided while contacting the outer surface of the steel strip (58). The tensile wire 64 and the steel strip 58 are coated with a polyethylene coating material 24.

However, in the conventional optical fiber cable configured as described above, since the two strands of the tensile wire are made of steel, the outer diameter is large, the optical cable is considerably stiff and thus does not bend when laid. Moisture (water) penetrates between the tension line and the steel strip and the covering material, thereby damaging the inherent properties of the optical fiber. Also, since the outer diameter of the tensile wire is large, the overall outer diameter of the optical cable is increased, and thus the material consumption is large, and in particular, a large amount of optical fiber is mounted. An unavoidable problem occurred.

SUMMARY OF THE INVENTION In order to solve the above problems, an object of the present invention is to provide a single-tube optical fiber cable that can prevent the piston phenomenon between the tension line and the covering material by distributing the required tensile force of the optical cable because two or more types of tension lines are installed.

Another object of the present invention is to provide a single-tube optical fiber cable that can minimize the outer diameter of the optical cable because the tension wire is distributed to the optical cable.

Still another object of the present invention is to provide a single-tube optical fiber cable that can improve the required tensile strength of the optical cable because each of the host ship and the auxiliary tension line installed inside the optical cable.

Still another object of the present invention is to provide a single tube optical fiber cable which can reliably prevent moisture from penetrating into the optical cable.

In order to achieve the above object, the present invention comprises a tube containing a jelly to prevent moisture penetration into the optical axis of the optical cable including at least one core, and the optical fiber properties from the waterproof and external environment on the outside of the tube In the single-tube optical fiber cable structure having a waterproof material and a metal tape to secure, the outer side of the metal tape is provided with two strands of the host cable and at least two strands of the auxiliary tension line to suppress the tension and shrinkage of the optical cable do.

1 is a cross-sectional view showing the configuration of a single tube optical fiber cable according to an embodiment of the prior art.

Figure 2 is a cross-sectional view showing the configuration of a single tube optical fiber cable installed with two strands of the auxiliary tension line and two strands of the host according to an embodiment of the present invention.

Figure 3 is a cross-sectional view showing the configuration of a single tube optical fiber cable used for the pipeline according to a second preferred embodiment of the present invention.

Explanation of symbols for the main parts of the drawings

10: optical fiber 12: jelly

14: tube 16: waterproofing material

18: metal tape 20, 32: owner

22,34: auxiliary liner 24: coating material

30: aluminum tape

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, in adding reference numerals to the components of each drawing, it should be noted that the same reference numerals are used for the same components, even if displayed on different drawings. In describing the present invention, when it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

Figure 2 is a cross-sectional view showing the configuration of a single tube optical fiber cable is installed with two strands of the auxiliary tension line and two strands of the host according to an embodiment of the present invention.

As shown in FIG. 2, the optical cable is mounted with one or more acrylic coated optical fibers 10 marked for identification between optical fibers having an appropriate penetration rate and protect the optical fibers 10 from external impact. The tube 14 is installed. At this time, the optical fiber 10 is mounted to the empty space of the remaining tube 14 to prevent moisture from penetrating the surface of the optical fiber 10, and to allow the optical fiber 10 to perform a specific connection for smooth functioning during operation It is filled with a jelly 12 to maintain the particle ratio and buffer the contact friction between the optical fiber 10 and the compression to the optical fiber 10.

In addition, the outer circumferential surface of the tube 14 has a waterproof material 16 to prevent moisture from penetrating in the longitudinal direction of the optical cable. For example, since the waterproof tape 16 is composed of a powder that expands in volume when absorbing moisture, the waterproof tape 16 absorbs water when infiltrating and expands the volume to block the passage of moisture to protect the optical fiber 10. In addition, a corrugated metal tape 18 is wound around the outer circumferential surface of the waterproof material 16 to protect the optical fiber 10 inside the tube 14 from the external environment. At this time, the metal tape 18 is a steel tape coated with a copolymer coated on both sides in order to protect the interior from external penetrating elements such as side pressure or rodent acting on the optical cable, or for moisture-proofing of the optical cable Aluminum tape coated with copolymer on both sides may also be used.

In addition, the outer side of the metal tape 18, the steel material or fiber reinforcement having the characteristics of high tensile strength and high Young's modulus in order to protect the optical fiber 10 from the tension and contraction force applied to the optical cable during the installation or operation of the optical cable The owner line 20 made of plastic material is installed (two strands) at intervals of 180 degrees from each other while maintaining a constant distance from the metal tape 18. At this time, the outer diameter of the host ship 20 is manufactured to withstand 50% or more of the required tensile strength of the optical cable.

In addition, the outer side of the metal tape 18 of the aramid fiber or glass-based fiber material having a high tensile strength and high Young's modulus to apply the tensile force so that the optical cable has a tensile force as insufficient as the host cable 20 Auxiliary tension line 22 is installed each (two strands) while maintaining an interval of 90 degrees with the two strands of the host line 20, respectively. The two strands of the host ship 20 and the at least two strands of the auxiliary strand 22 are coated with the entire outer circumferential surface by a polyethylene coating material 24 that protects the optical cable.

3 is a cross-sectional view showing the configuration of a single tube optical fiber cable used for a pipeline according to a second preferred embodiment of the present invention.

As shown in FIG. 3, the optical cable is mounted with one or more acrylic coated optical fibers 10 marked thereon for identification between the optical fibers having an appropriate penetration rate, and protects the optical fiber 10 from external impact. The tube 14 is installed. At this time, the optical fiber 10 is mounted on the empty space of the remaining tube 14 to prevent the penetration of moisture to the surface of the optical fiber 10 and to allow the optical fiber 10 to have a specific penetration rate for smooth functioning during operation The jelly 12 is filled to reduce the contact friction between the optical fibers 10 and to buffer the compression of the optical fibers 10.

On the outer circumferential surface of the tube 14, aluminum-coated tape 30 coated with a copolymer is coated on both sides of the optical cable for moisture proof. Outside of the aluminum tape 30, the steel material or fiber reinforcement having high tensile strength and high Young's modulus to protect the internal optical fiber 10 from the tension and contraction force applied to the optical cable during the installation or operation of the optical cable. The owner line 32 made of plastic material is installed in two strands at 180 degree intervals from each other while maintaining a constant distance from the aluminum tape 30. At this time, the outer diameter of the host ship 32 is manufactured to withstand 50% or more of the required tensile strength of the optical cable.

In addition, the aramid fiber or glass-based fiber material having a high tensile strength and high Young's modulus properties to the outside of the aluminum tape 30 in order to apply the tensile force so that the optical cable has as much tension as the host ship 32 lacked Auxiliary tension line of 34 is installed on both sides (over 2 strands overall) at least one strand at a distance of 90 degrees with the host ship 32. The two strands of the host wire 32 and at least two strands of the auxiliary strand 34 are covered with the entire outer peripheral surface by a polyethylene coating material 24 that protects the optical cable.

As described above, in the single tube optical fiber cable according to the embodiment of the present invention, the host cable and the auxiliary cable line are separately installed to maintain a constant tensile force required by the optical cable, thereby significantly reducing the outer diameter of the host cable, thereby reducing the final outer diameter of the optical cable. Also, by installing the host ship spaced apart from the metal tape or aluminum-tape at regular intervals, it can be completely wrapped by the coating material to prevent the penetration of moisture into the tube, and also the outer diameter of the host ship is small Therefore, it is possible to prevent the piston phenomenon with the coating material, and also to manufacture the auxiliary tensile wire made of high-strength fiber material to maintain the intrinsic properties of the optical fiber in the environment of low temperature and high temperature according to the temperature change of the optical cable, and the coating material of the optical cable Molt When you want it is not necessary to mount a separate rip cord, and there is an effect that can be the auxiliary factor coverings because the distributed buffering action standing protect the optical fiber inside the tube by the impact of the external lateral pressure exerted on the optical cable.

Claims (8)

A single tube containing one or more optical fibers and containing jelly to prevent water penetration into the central axis of the optical cable, and a waterproof material and a metal tape on the outside of the tube to secure the optical fiber properties from the external environment. In the single tube optical fiber cable structure, Single tube optical fiber cable, characterized in that the outer side of the metal tape is provided with two strands of the owner and at least two strands of the auxiliary tension line for suppressing the tension and shrinkage of the optical cable. The method of claim 1, wherein the host ship is made of a steel material or a fiber-reinforced plastic material having a high tensile strength and high Young's modulus to have an outer diameter that can withstand 50% or more of the required tensile strength of the optical cable Single tube fiber optic cable. The single-tube optical fiber optical cable according to claim 1, wherein the host line is provided not to be in close contact with the outer surface of the metal tape. The single tube optical fiber cable according to claim 1, wherein the host wire is installed on both sides of the metal tape to maintain a distance of 180 degrees from each other, and the auxiliary tension line is installed to maintain a distance of 90 degrees from the host wire. The single tube optical fiber cable according to claim 1, wherein the auxiliary tension line is made of aramid fibers or glass-based fibers having high strength and high Young's modulus. The single tube optical fiber cable according to claim 1, wherein the metal tape is made of aluminum or steel coated on both sides with a copolymer. In the structure of the single tube optical fiber cable used for the pipeline, The optical cable is a tube made of a plastic material filled with a jelly for mounting one or more optical fibers and preventing water penetration into the optical fiber side, and an aluminum tape taped around the outer surface of the tube to prevent water penetration into the longitudinal axis of the optical cable. And, to protect the optical fiber from the tension and contraction force applied to the optical cable, two strands of the leader line installed at both sides of the aluminum-tape while maintaining a distance of 180 degrees from each other, and the tensile force of the host cable as insufficient. Single tube optical fiber, characterized in that composed of at least two strands of at least two strands installed on both sides while maintaining a distance of 90 degrees with the host cable for application, and covering material covering the entire outer surface of the host cable and the auxiliary cable to protect the optical cable cable. 8. The single-tube optical fiber optical cable according to claim 7, wherein the host wire is installed not to be in close contact with the outer surface of the aluminum tape.