KR20000047131A - Tight-buffered optical fiber and super multi-core optical cable having the same - Google Patents

Abstract

The present invention relates to a tight buffer optical fiber and an ultra multi-core optical cable having the same, and an object thereof is to increase the optical fiber density by arranging each of the optical fiber core wires and the units in close contact with each other.

The tight-buffered optical fiber according to the present invention includes a center tension line positioned on a center axis to correspond to an external tension force, a plurality of optical fiber core wires spirally arranged along a length direction and disposed to be in contact with each other on an outer circumferential surface of the center tension line; The plurality of optical fiber core has a feature consisting of a coating layer coated in one bundle form by a resin of a hard material.

The ultra multi-fiber optical cable having a tight buffer optical fiber according to the present invention is a conventional ultra multi-fiber optical cable having a center tension line, wherein a plurality of optical fiber core wires are arranged to be in close contact with each other and hard in a state where they are twisted spirally along the longitudinal direction. A plurality of tight buffered optical fibers and a plurality of tight buffered optical fibers, which are coated in one bundle by a resin of a material, are arranged to be in close contact with each other on the outer circumferential surface of the sub-tensile wire and twisted in a spiral along the longitudinal direction. A plurality of units having a predetermined coating layer on a surface thereof, and the plurality of units are arranged to be in close contact with each other on the outer peripheral surface of the center tension line, and are coated in a predetermined shape in a spirally twisted state along a longitudinal direction.

Applying the present invention, the tight buffer optical fiber is made of a thin coating of a coating material of a hard material in a state in which a plurality of optical fiber core wires are arranged in one bundle form without extra space, so that the optical fiber density is significantly higher do.

In addition, the ultra-multi-fiber optical cable having the tight buffer optical fiber has a plurality of units are arranged in close contact with each other, the plurality of tight buffer optical fibers in each unit are arranged so as to be in close contact with each other without any extra space, the optical fiber density Becomes even higher.

Description

Tight Buffered Fiber and Ultra-Central Fiber Cable

The present invention relates to a tight buffer optical fiber and a super multi-core optical cable having the same, and more particularly, in a bundle form as a coating material of a hard material in a state in which a plurality of optical fiber core wires are arranged to be in close contact with each other. The present invention relates to a tight-buffered optical fiber coated with a remarkably high optical fiber density and an ultra-high optical fiber having the same.

In general, the demand for optical cables is gradually increasing due to the spread of subscriber networks related to various communication services such as LAN, LOCAL AREA NETWORK, bidirectional communication, and video call.

There are various types of such optical fiber cables, depending on the use, and are largely divided into a cable installed outdoors, a cable installed indoors and a cable for entry installed between the outdoors and indoors.

Among these optical cables, outdoor cables may be installed for several tens of kilometers or thousands of kilometers, and when they are buried underground, they are dug into the ground and buried in soil. When an abnormality occurs in a track, it is very difficult to check and repair and replace cables. There is a very difficult disadvantage.

Therefore, to compensate for these disadvantages, a communication tunnel is artificially installed underground and a cable is installed in the tunnel (communication port).

In this case, the maintenance and replacement of the cable is easy, but there is a problem that the overall construction cost is enormous.

Therefore, in recent years, a method of constructing an optical cable has been mainly used by installing a hollow pipe having a constant diameter in the ground and inserting a cable into the pipe.

The pipelines are installed between manholes and manholes at regular intervals because they are buried in lengths of hundreds to thousands of kilometers.

In this case, the rope is inserted into the pipeline, and the pipeline is buried underground, and the cable is installed in the pipeline by pulling and connecting the optical cable to the end of the rope.

In addition, in the case of the incoming optical cable, since the cable from the outdoor cable to the terminal box inside the building must be installed, a predetermined pipeline is formed through the wall of the building and drawn into the building.

1 is a perspective view of a conventional multi-slot optical cable.

Referring to this, the multi-slot optical cable 40 spirally forms a plurality of grooves 44 of a predetermined depth along the outer circumferential surface of the multi-slot core 43 located inside a predetermined sheath, and the grooves 44 A plurality of optical fiber ribbons 45 are inserted in the stack, and a tensile line 41 made of iron wire or synthetic fiber is inserted on the central axis to correspond to an external force.

At this time, since the groove 44 is formed with a predetermined width and depth along the outer circumferential surface of the multi-slot core 43, the space between the grooves 44 and the grooves 44 becomes narrower toward the radial center direction. The space of must be kept above a certain width to form the grooves 44 at all times, causing a decrease in the optical fiber density.

In addition, in recent years, as the number of subscribers increases, more ultra-deep fiber cables are required. In order to embed more optical fibers in the optical cables, the number of grooves 44 of the multi-slot core 43 must be increased. In order to increase the number of grooves 44, the number of layers of the multi-slot core 43 is increased, so that the diameter of the optical cable itself is increased, which makes it difficult to install the existing pipe.

It is a main object of the present invention to provide a tight buffer optical fiber having a high optical fiber density by having a plurality of optical fiber core wires arranged in a bundle without extra space and being thinly coated with a coating material of a hard material.

In addition, another object of the present invention is to provide a super multi-core optical cable that is arranged so that a plurality of tight buffered optical fibers are in close contact with each other, such that a separate extra space is not required between the grooves as in the conventional multi slot optical cable.

1 is a perspective view of a conventional slotted optical cable,

2 is a perspective view of a tight buffer optical fiber according to the first embodiment of the present invention;

3 is a cross-sectional view of a first buffered optical fiber according to the first embodiment of the present invention;

4 is a perspective view of a tight buffer optical fiber according to a second embodiment of the present invention;

5 is a cross-sectional view of a second embodiment of the tight buffer optical fiber according to the present invention;

6 is a perspective view of a super multi-core optical cable having a tight buffer optical fiber according to the present invention,

7 is a perspective view of a super multi-core optical cable having a tight buffer optical fiber according to the present invention.

*** Explanation of symbols for the main parts of the drawing ***

10: tight buffer optical fiber 11: tension wire

13 optical fiber core 15 coating layer

20 unit 21 tension line

25: covering layer 30: optical cable

31: tension line

The first embodiment of the tight-buffered optical fiber according to the present invention is a plurality of spirally disposed along the longitudinal direction of the center tension line located on the center axis to correspond to the external tension force, and to be in contact with each other on the outer peripheral surface of the center tension line And a plurality of optical fiber core wires, and a plurality of optical fiber core wires are characterized by consisting of a coating layer coated in one bundle by a resin of a hard material.

In the first embodiment of the tight buffer optical fiber according to the present invention, the coating layer has a feature formed of an acrylate resin.

The second embodiment of the tight buffer optical fiber according to the present invention is arranged to be in close contact with each other, consisting of a plurality of optical fiber cores twisted in a spiral along the longitudinal direction, and a coating layer coating the plurality of optical fiber cores in one bundle form Has characteristics.

In the second embodiment of the tight buffer optical fiber according to the present invention, the coating layer has a feature formed of an acrylate resin.

The ultra multi-fiber optical cable having a tight buffer optical fiber according to the present invention is a conventional ultra multi-fiber optical cable having a center tension line, wherein a plurality of optical fiber core wires are arranged to be in close contact with each other and hard in a state where they are twisted spirally along the longitudinal direction. A plurality of tight buffered optical fibers and a plurality of tight buffered optical fibers, which are coated in one bundle by a resin of a material, are arranged to be in close contact with each other on the outer circumferential surface of the sub-tensile wire and twisted in a spiral along the longitudinal direction. A plurality of units having a predetermined coating layer on a surface thereof, and the plurality of units are arranged to be in close contact with each other on the outer peripheral surface of the center tension line, and are coated in a predetermined shape in a spirally twisted state along a longitudinal direction.

Hereinafter, the first embodiment of the tight buffer optical fiber according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a perspective view of a tight buffer optical fiber according to the first embodiment of the present invention.

Referring to this, in the tight buffer optical fiber 10, a central tensile line 11 made of steel wire or high strength synthetic resin is disposed on a central axis, and a plurality of optical fiber core lines 13 are formed on an outer circumferential surface of the central tensile line 11. Positioned so as to be in close contact with each other is made in one bundle form by a hard resin in the state twisted spirally along the longitudinal direction.

At this time, the coating material forming the coating layer 15 of the tight buffer optical fiber 10 is made of a polyacrylate resin of a relatively hard material, it is made to respond to the impact force or external force applied from the outside.

In the tight buffer optical fiber 10, since a plurality of optical fiber core wires 13 are disposed on the circumferential surface thereof in a state where a tensile wire 11 capable of sufficiently coping with external tension force is disposed, it is usually applied to a multicore optical fiber of 6 cores or more. Apply.

The operation of the first embodiment of the tight buffer optical fiber according to the present invention having the above configuration will be described in detail with reference to the accompanying drawings.

3 is a cross-sectional view of the first embodiment of the tight buffer optical fiber according to the present invention.

Referring to this, the tight buffer optical fiber 10 is made of a thin coating of a coating material of a hard material in a state in which a plurality of optical fiber cores 13 are arranged in one bundle form, the optical fiber density is significantly higher, the central axis Since the tensile wire 11 is made of a steel wire or a high strength synthetic resin is disposed on it, it can be made to cope with the external tensile force enough to manufacture a multi-core optical fiber of 6 or more cores.

In addition, the coating layer 15 is made of a polyacrylate-based synthetic resin of a relatively hard material is made to cope with external impact force or external force.

Hereinafter, a detailed description will be given of the tight buffer optical fiber according to the second embodiment of the present invention with reference to the accompanying drawings.

4 is a perspective view of a tight buffer optical fiber according to a second embodiment of the present invention.

Referring to this, the tight buffer optical fiber 10 is positioned so that the plurality of optical fiber cores 13 are in close contact with each other and is coated in one bundle by a resin of a hard material in a spirally twisted state along the longitudinal direction. Is done.

At this time, the coating layer 15 of the tight buffer optical fiber 10 is formed of a polyacrylate resin of a relatively hard material, it is made to respond to the impact force or external force applied from the outside.

Since the tight buffer optical fiber 10 is not provided with a separate tension line, it is usually applied to a low-core optical fiber of less than 6 cores in which tensile force is relatively small.

The operation of the second embodiment of the tight buffer optical fiber according to the present invention having the above configuration will be described in detail with reference to the accompanying drawings.

5 is a cross-sectional view of a second embodiment of the tight buffer optical fiber according to the present invention.

Referring to this, the tight buffer optical fiber 10 is coated with a thin coating material of a hard material in a state in which a plurality of optical fiber cores 13 are in close contact with one bundle form, the optical fiber density is very high.

In addition, the coating layer 15 is made of a polyacrylate-based synthetic resin of a relatively hard material is made to cope with external impact force or external force.

Hereinafter, with reference to the accompanying drawings for a multi-core optical cable having a tight buffer optical fiber according to the present invention will be described in detail as follows.

6 is a perspective view of a super multi-core optical cable having a tight buffered optical fiber according to the present invention.

Referring to this, the ultra-multi-core optical cable is positioned such that a central tensile line 31 made of a steel wire or a high strength synthetic resin is disposed on a central axis, and a plurality of units 20 are in close contact with each other on the outer peripheral surface of the central tensile line 31. And covered by a predetermined coating layer 25 in a state of being twisted spirally along the longitudinal direction.

At this time, each of the units 20 is a sub-tension line 21 made of steel wire or high strength synthetic resin is disposed on the center axis, a plurality of tight buffer optical fibers 10 are in contact with each other on the outer peripheral surface of the sub-tension line 21 It is positioned so as to be covered with waterproof tape in a spirally twisted state along the longitudinal direction.

At this time, the tight buffer optical fiber 10 is a tensile line 11 made of a steel wire or a high strength synthetic resin is disposed on the center axis line, the plurality of optical fiber core wires 13 are in contact with each other on the outer peripheral surface of the tensile line (11). It is made in one bundle form by the resin of the hard material in the state twisted spirally along the longitudinal direction.

At this time, the coating layer of the tight buffer optical fiber 10 is formed of a polyacrylate resin of a relatively hard material is made to respond to the impact force or external force applied from the outside.

Such a tight buffer optical fiber 10 is usually applied to a multi-core optical fiber of 6 or more cores because a plurality of optical fiber cores 13 are disposed on the circumferential surface thereof in a state in which the tensile line 11 is positioned on the central axis thereof.

The coating layer on the outer surface of the optical cable 30 has a waterproof layer 34 coated with a waterproof tape to prevent moisture penetration therein, and aluminum to relieve moisture penetration and external impact on the outer peripheral surface of the waterproof layer 34. A metal coating layer 35 made of steel or steel is formed, and a polystyrene (PE) coating layer 36 is formed on the outermost layer.

The working example of the ultra multi-fiber optical cable having a tight buffer optical fiber according to the present invention having the above configuration will be described in detail with reference to the accompanying drawings.

7 is a perspective view of a super multi-core optical cable having a tight buffer optical fiber according to the present invention.

Referring to this, the ultra-multi-core optical cable 30 is made of a plurality of units 20 are arranged in close contact with each other on the outer peripheral surface of the center tension line 31, each of these units 20 are a plurality of tight buffer optical fiber 10 Are arranged to be in close contact with each other.

Therefore, between the units 20 in the optical cable 30 and between the tight buffer optical fiber 10 in each unit 20 is arranged to be in close contact with each other without any extra space, the optical cable ( The optical fiber density of 30 is significantly increased.

At this time, the tight buffer optical fiber 10 is made of a thin coating of a coating material of a hard material in a state in which a plurality of optical fiber cores 13 are arranged in a bundle form, the optical fiber density is further increased.

In addition, the coating layer 15 is made of a polyacrylate-based synthetic resin of a relatively hard material is made to cope with external impact force or external force.

According to the experimental data, in the case of the conventional multi-slot optical cable, a 300-core optical fiber core is embedded in an optical cable having a diameter of 17 mm, and the optical fiber density is about 1.322 core / mm 2, but the optical cable 30 having the tight buffer optical fiber 10 is In this case, a 216 core optical fiber core 13 is embedded in a 9 mm diameter optical cable, and the optical fiber density is found to be about 3.397 cores / mm 2, indicating that the optical fiber density is significantly improved.

According to the present invention, the tight buffer optical fiber is made of a thin coating of a coating material of a hard material in a state in which a plurality of optical fiber core wires are arranged in a bundle form without extra space, so that the optical fiber density is significantly increased. do.

In addition, since the multi-core optical cable having the tight buffer optical fiber is arranged in a plurality of units closely adhered to each other, and the plurality of tight buffer optical fibers in each unit are arranged to be in close contact with each other, and in the conventional multi-slot optical cable Likewise, since a separate space is not required between the grooves, the optical fiber density becomes higher.

Claims (5)

A center tension line 11 positioned on the center axis so as to correspond to an external tension force; A plurality of optical fiber core wires (13) positioned in contact with each other on the outer circumferential surface of the central tension line (11) and arranged spirally along the longitudinal direction; Tight buffer type optical fiber, characterized in that consisting of a coating layer (15) coated with a plurality of optical fiber core wires 13 in the form of a hard resin. The method of claim 1, The coating layer 15 is a tight buffer optical fiber, characterized in that formed of acrylate resin. A plurality of optical fiber cores 13 arranged to be in close contact with each other and twisted spirally along the longitudinal direction; Tight buffer type optical fiber, characterized in that consisting of a coating layer 15 coated with a plurality of optical fiber core wires 13 in the form of a bundle. The method of claim 3, The coating layer 15 is a tight buffer optical fiber, characterized in that formed of acrylate resin. In a conventional ultra-core fiber cable having a center tension line 31, A plurality of tight buffer optical fibers 10 which are arranged to be in close contact with each other and the plurality of optical fiber core wires 13 are coated in one bundle by resin of a hard material in a spirally twisted state along the longitudinal direction; A plurality of units having a predetermined coating layer 25 formed on an outer surface of the plurality of tight buffer optical fibers 10 so as to be in close contact with each other on the outer circumferential surface of the sub-tensile wire 21, and being twisted spirally along the longitudinal direction ( 20); The ultra-buffered optical fiber having a tight buffer optical fiber, characterized in that the plurality of units 20 are arranged to be in close contact with each other on the outer peripheral surface of the center tension line 31 is coated in a predetermined shape in a spirally twisted state along the longitudinal direction. Multi-core optical cable.