KR101524415B1 - Non Tight buffer optical cable for being used drop and indoors - Google Patents

Abstract

According to the present invention, a non-tight buffer leading and indoor optical cable includes an optical fiber located in the center of the cable, a tensile reinforcement enclosing the optical fiber, and a fixed outer jacket wrapping the optical fiber and the tensile reinforcement. The invention provides the non-tight buffer leading and indoor optical cable in which the change in the light loss value maintains to be 0.1 dB or less when compressing the optical cable for 5 minutes under a load of 100 kg, and the change in the light loss value maintains to be 0.1 dB or less at the free fall from the height of 1 m of a rod of 0.7 kg with diameter 25 mm on the cable.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a non-

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bidet buffering and indoor optical cable, and more particularly, to an optical cable manufacturing technology that constitutes a physical network of optical communication, and can efficiently and stably install a network And an " inflow and indoor optical cable "

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cable, and more particularly to a drop and an indoors optical cable.

Recently, the data amount of the network has increased and the transmission speed has been changed from the communication method using UTP (Unshielded twisted pair cable) to the FTTH (Fiber To The Home) method using the optical fiber and the FTTO This is a general trend.

Therefore, all networks are being made into fiber-optic cable, and in particular, optical fiber cables are used for indoor entry and indoor network construction outdoors.

However, in order to protect the optical fiber during the manufacturing process, a conventional type of tight buffer such as a 0.6 mm or 0.9 mm outer diameter is used, which is primarily coated with an optical fiber.

Therefore, it is necessary to add a work process for making a tight buffer when producing optical cables for the above purposes, and there is a restriction on the cable structure change.

In addition, additional work processes are required to produce a first buffered layer of a buffer layer on the optical fiber, resulting in a cost increase.

Such an incoming and indoor optical fiber cable is disclosed in detail in U.S. Patent No. 4,629,286, Korean Patent Laid-Open Nos. 10-2008-0068212 and 10-2014-0051538.

FIG. 1 is a cross-sectional view showing a structure of a conventional single-core lead-in or single-core optical fiber cable, and FIG. 2 is a sectional view showing the structure of a conventional double-core lead-

As shown in FIG. 1, a conventional single core type fiber optic cable includes a core 112, a clad 114, a tight buffer layer 116, a reinforcing member 120, and a jacket 130.

The optical fiber unit 110 includes a core 112 as a portion through which light is transmitted and a clad 114 having a refractive index lower than that of the core on the outer circumference of the core. ).

The tight buffer layer 116 is made of an elastic material and surrounds the core and the outer surface of the clad.

The tight buffer layer 116 functions to buffer external forces such as tensile, compression, and bending loads applied to the optical fiber cable from the outside. The tight buffer layer 116 performs a coloring process in order to distinguish corresponding optical fibers when connecting the optical fiber cables.

The reinforcing member 120 is wound around the outer circumferential surface of the tight buffer layer in a spiral shape having a predetermined pitch. The reinforcing member 120 reinforces the axial tensile strength of the optical fiber cable. As the reinforcing member 120, an aramid yarn such as Kevlar or the like is used.

The jacket 130 is a covering layer of a polymer material wrapped around the reinforcing member. The jacket 130 is located at the outermost portion of the optical fiber cable and primarily protects the inside of the optical fiber cable in response to external mechanical load and chemical environment.

The jacket 130 may be made of polyvinyl chloride, polyethylene, or the like.

Also, as shown in FIG. 2, the conventional eccentric inlet or indoor optical fiber cable differs in that the optical fiber unit is provided in two cores in FIG.

However, the conventional lead-in or fiber-optic fiber cable as described above uses a tight buffer for the core and the clad outer diameter of the optical fiber, thereby adding a work process for producing a tight buffer at the time of production, thereby increasing production costs.

In order to protect the optical fiber, a tight buffer such as PVC, LSZH or the like is used to protect the optical fiber by 0.6mm or 0.9mm in the optical fiber. Therefore, the shrinkage of the polymer material surrounding the optical fiber and the optical fiber , There is a problem that stress is applied to the optical fiber when the temperature is extremely changed due to a difference in degree of expansion.

In addition, there is a problem in that the process of peeling the optical cable is not easy due to the tight buffer layer in the installation work in the field.

Accordingly, it is an object of the present invention to provide an optical fiber which is stable in optical characteristics, convenience in use, simplification of a manufacturing process, and reduction in production cost when an optical cable is installed and used.

Another object of the present invention is to provide a lead-in optical cable that does not use tight buffers and thus reduces loss due to stress even when the optical fiber undergoes a severe temperature change

It is still another object of the present invention to provide a method and apparatus for connecting a fiber optic cable to an existing cable without disassembling the tight buffer layer.

According to an aspect of the present invention, there is provided a bidet buffer ingot and an indoor optical cable including: at least one optical fiber positioned at a center of a cable;

A tensile reinforcement surrounding the optical fiber; And a sheath enclosing the optical fiber and the tensile stiffener and extruding the optical fiber so that there is no gap therebetween to fix the optical fiber without movement. The optical fiber has a loss of 0.1 dB or less when the optical fiber is compressed for 5 minutes under a load of 100 kg And the change of the optical loss value is kept at 0.1 dB or less when impact is applied by free fall at a height of 1 m with a shock bar having a diameter of 25 mm and a load of 0.7 kg.

The outer diameter of the optical cable is preferably 2.0 to 5.0 mm.

And at least one or more optical fibers, wherein the optical fibers are colored in different colors.

The tensile stiffener may be made of any one of aramid yarn, glass yarn, fiber reinforced plastic, and optical fiber.

It is preferable that the shell is made of any one material made of a polymer material such as PVC, PE, LSZH or nylon or polyurethane,

In addition, the Bite-Tite buffer lead-in and the indoor optical cable are two-core duplex optical cables, which are connected by at least one pair.

According to the present invention, since the manufacturing process is simplified as compared with the conventional tight buffer type inlet and indoor optical cable, that is, direct sheathing is performed on the optical fiber, the production cost of the tight buffer is not required and the production cost can be reduced. In addition, it is possible to reduce the outer diameter by 20% compared to conventional cable, so that it is possible to change the outer diameter to suit the required environment in cases such as window frames, walls, trays,

In addition, the cable is a round shape of a full-shish sheath, which is easy to mount on-site assembled connectors and provides convenience in installation at customer's premises and in-house piping.

FIG. 1 is a cross-sectional view showing indoor and outdoor optical cables using a single-use tight buffer layer,
FIG. 2 is a cross-sectional view showing indoor and outdoor optical cables using a conventional double buffer layer; FIG.
FIG. 3 is a cross-sectional view showing a prismatic beat buffer entrance and an indoor optical cable according to the present invention,
FIG. 4 is a cross-sectional view showing a bidet-type bidet entrance and an indoor optical cable according to the present invention,
Fig. 5 is a cross-sectional view showing an indoor and an outdoor outdoor optical cable in which each one-core optical cable is used as a two-core duplex cord,
6 is a configuration diagram showing an apparatus for manufacturing the indoor optical cable shown in Figs.

Hereinafter, the present invention will be described in detail with reference to the drawings. It is to be noted that the same elements among the drawings are denoted by the same reference numerals whenever possible. In the following description, well-known functions or constructions are not described in detail since they would obscure the invention in unnecessary detail.

FIG. 3 is a cross-sectional view illustrating a configuration of a 1-core beating buffer inlet and an indoor fiber-optic cable according to a first embodiment of the present invention.

The lead-in optical fiber cable 300 according to the first embodiment of the present invention includes at least one optical fiber 310 through which light travels, and a plurality of optical fibers 310 A tensile reinforcement 320 for protecting the tensile reinforcement 320 from external impact and a sheath 330 surrounding the tensile reinforcement 320 and surrounding the tensile reinforcement 320 without any gap.

The optical fiber 310, the tensile stiffener 320 and the sheath 330 are made of a non-metallic material such as glass fiber reinforced plastic (FRP), aramid yarn reinforced plastic (ARP), glass reinforced fiber, aramid yarn, It is an optical cable using a metal material such as a steel wire.

Here, the optical fiber 310 is a single core and is located at the center of the optical cable 300, and is a means for advancing the light through the inside thereof. The optical fiber 310 in the first embodiment is referred to as a non-tight buffer optical fiber.

Therefore, since the tight buffer layer is not used around the optical fiber, the fabrication process is simplified, that is, the optical fiber is directly sheathed, so that the production process of the tight buffer is not necessary and the production cost can be reduced.

In addition, it is possible to reduce the outside diameter, and it is easy to install by the entrance wall and indoor cable such as walls, small wiring ducts, ceilings, floors, narrow window gaps and the like inside buildings such as buildings, apartments and offices.

In addition, since the optical cable has a round structure, it is advantageous in that it reduces the frictional force even when compared with the square type in the past,

Preferably, the tensile stiffener is made of any one of aramid yarn, glass yarn, fiber reinforced plastic, or an optical fiber.

As shown in FIG. 3, the tensile reinforcing material is preferably made of aramid yarn, and is positioned outside the optical fiber 310 to maintain the attitude of the optical fiber 310, and at the same time, Respectively. The aramid yarn extends in the same form as the optical fiber 310.

Therefore, the optical fiber is directly wrapped in the same kind of tensile reinforcement material as the aramid yarn and the polymer material such as PE, PVC, LSZH, nylon, and polyurethane is applied to the inside of the cable without any gap, The optical fiber is fixed to the center of the cable core without movement and is protected by a tensile reinforcement such as aramid yarn and has physical environment characteristics such as impact, compression, bending, temperature, etc. Respectively.

The cover 330 is formed at the outermost portion of the optical cable 300 to protect the inside of the optical cable from the external environment and is wrapped around the tensile reinforcement 320 and the tensile reinforcement 320, Directly extruded.

Meanwhile, in the conventional optical fiber covering material using the tight buffer layer, shrinking expansion occurs according to the change of the temperature and humidity of the surrounding environment, and optical fiber which does not cause expansion and contraction is stressed to cause optical loss.

In order to solve this problem, the fiber optic cable eliminates the cause of optical loss by eliminating the tight buffer operation which performs primary coating with a polymer material such as PVC or LSZH.

In the case of outer covering with PE, PVC, LSZH, Nylon, polyurethane and other polymer materials, as shown in Fig. 6, the optical fiber is positioned at the center by using the solid extrusion dies and nipples and the tensile reinforcement is wrapped To be extruded in a faithful form. Accordingly, as shown in FIG. 6, the optical fiber 310 and the tensile stiffener 320 are extruded in a filled state without any gap between the cable core and the sheath 330, thereby maintaining the tensile strength of the optical cable by maintaining the friction between the tensile reinforcement and the sheath. Respectively.

In Fig. 6, the end portion of the nipple is inwardly inward by a distance d than the dies, so that the covering material can extrude the cable core in a faithful manner without gap.

The distance d may be 0.2 mm to 5.5 mm, although it may vary depending on the outer diameter and structure of the cable.

Therefore, the occurrence of optical fiber stress is minimized during extrusion, and the outer core covers the cable core while maintaining the optical fiber at the center of the cable. It also made it easier to work the envelope.

Also, even under the condition that the optical cable is compressed under a load of 100 kg for 5 minutes, the change of the optical loss value is kept at 0.1 dB or less, so that the communication is not hindered even if compression occurs during installation of the optical cable.

Also, it was found through the test that the optical loss was less than 0.1dB when the optical cable was shocked by falling free from a height of 1m with a 25mm diameter and 0.7kg diameter impact rod.

Compared to conventional tight buffer types, the physical properties such as shock, compression, bending, and temperature have been obtained without applying 0.6mm or 0.9mm tight buffer layer.

In addition, since the outer diameter of the optical cable can be reduced to about 20% of the outer diameter of the optical cable of the same purpose without using a tight buffer, it is easy to install the optical cable in a narrow space in the building, It can be reduced from 6.0mm to 2.0 ~ 5.0mm.

Therefore, the optical fiber connection work can be performed without peeling off the existing tight buffer layer during the installation work in the field, which is convenient.

4 is a cross-sectional view showing the structure of a lead-in and lead-in optical cable 400 according to a second embodiment of the present invention.

As shown in FIG. 4, the two-core or more two-core type or more indoor optical cable 400 differs from the first embodiment in that the optical fiber 410 is provided with two or more cores. That is, the features of the first embodiment are also applied to the case of the second embodiment. In this case, the optical fibers are color-coded in different colors to facilitate classification.

The optical fibers 410 having two or more cores are arranged so as to be in close contact with each other in order to increase the optical fiber density.

Therefore, it is made possible to cope with an external impact force or an external force.

Hereinafter, another embodiment of the present invention will be described with reference to FIG.

As shown in FIG. 5, the optical fiber 500 according to the third embodiment of the present invention differs from the first embodiment in that a 1-core optical fiber 510 is used as a 2-core duplex code. That is, the characteristic of the first embodiment is applied to the case of the third embodiment. In this case, the optical fibers are color-coded in different colors to facilitate classification.

Further, the two-core duplex optical cable is configured to be connected to at least one pair.

The connecting portion is made of a polymer material such as PE, PVC, LSZH, nylon or polyurethane which is the same material as the outer covering.

Each 1-core optical cable is used as a 2-core duplex cord and can be used indoors or outdoors.

Conventionally, when an indoor duplex cord is installed outdoors, an indoor duplex cord is inserted in a flexible conduit. However,

This optical cable can be used by directly installing the optical cable outdoors without a flexible conduit.

Although some embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope or spirit of the present invention. will be.

The scope of the invention will be determined by the appended claims and their equivalents.

100, 200, 300, 400, 500: Incoming and indoor optical cable
310, 410, 510: Optical fiber
320, 420, 520: tensile stiffener
330, 430, 530:

Claims (6)

For bidet buffering and indoor optical cable,
At least one optical fiber positioned at the center of the cable;
A tensile reinforcement surrounding the optical fiber; And
And an outer casing which surrounds the optical fiber and the tensile reinforcement and extrudes the end portion of the nipple from the inside of the nipple in a range of 0.2 mm to 5.5 mm so as not to have a gap therebetween so that the optical fiber is fixed without movement. The change of the optical loss value is kept at 0.1 dB or less when the impact is applied by free fall at a height of 1 m by a shock bar having a diameter of 25 mm and 0.7 kg, BITTLE BUFFER INPUT & INDOOR INTERFACE CABLE.
The method according to claim 1,
Wherein the optical cable has an outer diameter of 2.0 to 4.0 mm.

delete The method according to claim 1,
Wherein the tensile stiffener is made of any one of aramid yarn, glass yarn, fiber reinforced plastic, or optical fiber.
The method according to claim 1,
Wherein the outer cover is made of any one material formed of a polymer material such as PVC, PE, LSZH, nylon or polyurethane.
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