KR101426135B1 - Optical fiber cable - Google Patents

Abstract

An optical fiber cable according to an aspect of the present invention includes: a plurality of optical fibers; At least one aperture disposed inside or outside the optical fibers; And an outer cover located at an outermost portion of the optical fiber cable and surrounding the optical fibers and the at least one aperture.

Description

Fiber Optic Cable {OPTICAL FIBER CABLE}

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

Optical communication that exchanges information using an optical signal instead of an electrical signal uses an optical fiber made of glass fiber as an intermediary of signal transmission and has an advantage that a transmission speed is high and a transmission capacity is large compared with a communication method using an existing electric signal .

Fiber optic cables are fabricated in various forms to protect the optical fiber, which is a transmission path for transmitting an optical signal, from moisture and the external environment depending on the use environment and use. Such an optical fiber cable constitutes a plurality of communication networks and, depending on the installation location, an optical fiber cable for a duct, an outdoor optical fiber cable installed outdoors, an indoor optical fiber cable installed indoors, And optical fiber cables for incoming calls.

A loose tube optical fiber cable, which is a typical type of optical fiber cable, includes a central tensile line providing a tensile force, a plurality of loose tubes gathered around a center tensile line and mounted with a plurality of optical fibers, And a sheath for protecting the loose tube.

The incoming fiber-optic cable has an 8-shape, a concentric, and a flat structure depending on its structure, and it is directly or processed through a wall, a window, an existing duct, etc. between a photon, a pole and a subscriber.

These optical fiber cables must maintain the optical transmission medium function by maintaining the optical loss within the specification even under the circumstances of external environment change, tensile, impact, compression, etc. during installation and use.

However, the conventional optical fiber cable has a complicated internal structure, has a problem that it is expensive and time-consuming to manufacture, large in outer diameter and weight, and difficult to install and handle.

It is an object of certain embodiments of the present invention to at least partially solve, alleviate or eliminate at least one of the problems and / or disadvantages associated with the prior art.

It is an object of the present invention to provide an optical fiber cable which has proper mechanical / environmental characteristics in a situation where a fiber-optic cable is required to be installed due to the new installation and expansion of a communication network and which does not increase optical loss even at a small radius of curvature, Fiber optic cable. The present invention also provides an optical fiber cable which is simple in structure, small in size, easy to handle and install, does not have any additional components and thus shortens manufacturing cost and time, and has a circular structure and low surface resistance.

An optical fiber cable according to an aspect of the present invention includes: a plurality of optical fibers; At least one aperture disposed inside or outside the optical fibers; And an outer cover located at an outermost portion of the optical fiber cable and surrounding the optical fibers and the at least one aperture.

INDUSTRIAL APPLICABILITY According to the present invention, an optical fiber cable is provided which is simple in internal structure, has minimum cost and time to manufacture, is small in outer diameter and weight, and is easy to install and handle.

1 is a cross-sectional view showing an optical fiber cable according to a first preferred embodiment of the present invention,
2 is a cross-sectional view showing an optical fiber cable according to a second preferred embodiment of the present invention,
3 is a cross-sectional view illustrating an optical fiber cable according to a first preferred embodiment of the present invention.

The present invention can be variously modified and may have various embodiments, and specific embodiments will be described in detail with reference to the drawings. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. The term "and / or" includes any combination of a plurality of related listed items or any of a plurality of related listed items.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

1 is a cross-sectional view showing an optical fiber cable according to a first preferred embodiment of the present invention. The optical fiber cable 100 extends along its longitudinal direction, and FIG. 1 is a cross-sectional view showing the optical fiber cable 100 cut in a direction perpendicular to the longitudinal direction.

The optical fiber cable 100 includes a plurality of optical fibers 110 for transmitting an optical signal, first and second optical fibers 120 and 122 disposed on the inner side and the outer side of the optical fibers 110, respectively, Only the outer cladding 130 surrounding the optical fibers 110 and the first and second cladding 120, 122. The optical fiber cable 100 is a twelfth optical fiber cable having twelve optical fibers, and has a diameter of 1.7 mm or less.

Each of the optical fibers 110 may be any kind of optical fiber that is a transmission medium for an optical signal. Examples of such an optical fiber include a core in which an optical signal propagates in the longitudinal direction along its length and a clad for holding the optical signal in the core or a resin layer on the outside of the core Optical fibers, and tight buffer optical fibers. That is, the optical fiber is a bare optical fiber made of glass or plastic and made of a high-refractive-index core and a low-refractive-index clad, a bare optical fiber coated with a resin (this type is usually called an optical fiber) , Coloring the optical fiber to facilitate identification, extrusion coating the bare optical fiber with plastic (referred to as tight buffer optical fiber), and the like. For tight buffered optical fibers. As the material of the tight coating layer, a material containing or consisting only of one of polyvinyl chloride, Hytrel, nylon, polyethylene (PE) and polyester can be used.

Each of the optical fibers 110 and the first and second retroreflectors 120 and 122 has a generally circular shape (oval shape, circular shape with concavity and convexity, And the like). The optical fiber 110 preferably has a diameter of 250 mu m or less.

Each of the first and second openings 120, 122 can withstand high compressive and tensile loads and can have flame retardancy or absorbency. Each of the openings 120 and 122 may be fabricated from fiber reinforced plastic (FRP) yarns, aramid reinforced plastic yarns, flame retarded or non-flammable polypropylene yarns, polyester yarns, aramid yarns, A single filament made of a nonconductive material such as a glass yarn, or a combination of filaments (made by twisting them or integrating them by coating them). At this time, the yarn may be referred to as a filament. Alternatively, each of the openings may be formed by coating a plastic resin such as PE, PVC or low smoke zero halogen (LSZH) on the outer circumferential surface of a filament of a nonconductive material, a superabsorbent powder on the outer circumferential surface of a non- , Or a combination of a non-absorbent filament and a water-swellable yarn. At least one of the first and second reticle assemblies 120 and 122 is disposed outside the optical fibers 110 to assist in the evacuation of the outer sheath 130.

The outer cover 130 is located at the outermost portion of the optical fiber cable 100 and protects the optical fibers 110 disposed inside the outer cover 130 from external environment and can be integrally formed of a single material through an extrusion process. The outer cover 130 preferably has a high tensile strength and a high hardness in order to prevent the optical fiber cable 100 from being damaged by roadside or other obstacles when the optical fiber cable 100 is installed. As the material of the outer cover 130, a polyolefin-based material can be used, and a flame-retardant polyolefin having a tensile strength of 12 Mpa or more and a hardness (Shore D) of 52 or more can be used. Alternatively, a material containing or consisting only of one of polyvinyl chloride (PVC), polyethylene (PE), hytrel and nylon may be used as the material of the outer covering 130. In addition, the outer cover 130 preferably has an oxygen index of 28% or more to ensure sufficient flame retardancy. The oxygen index is a non-dimensional value of the critical oxygen concentration that can be ignited by a combustible solid, which is also referred to as a limit oxygen index (LOI). The outer sheath 130 may contain a halogen compound, aluminum hydroxide or magnesium hydroxide to increase the oxygen index. Alternatively, the outer cover 130 may be made of a low smoke zero halogen (LSZH) material having an ultraviolet protection function.

The first and second openings 120 and 122 improve the tensile force and the compressive strength of the optical fiber cable 100 and improve the peeling strength Lt; / RTI > That is, the operator strips the outer covering 130 of the optical fiber cable 100 and pulls the outer covering 130 by pulling one or all of the first and second inspection centers 120, And is released along the longitudinal direction of the optical fiber cable 100. Since the first and second openings 120 and 122 have a high tensile force and a compressive strength, the outer cover 130 can be continuously moved without cutting the first and second openings 120 and 122 More than 1m can be removed.

Since the outer covering 130 is formed by an extrusion process, the outer covering 130 is in intimate contact with the optical fibers 110 and the first and the first reticle 120, 122, 130 and one optical fiber 110 is 100 g / 10 cm or more. The outer covering 130 is peeled off with a predetermined length along the outer periphery of the optical fiber cable 100 at a position 10 cm away from the end of the optical fiber cable 100, A load at which the outer cover 130 is slid is measured, and the load at the moment when the outer cover 130 slips shows the adhesion in g / 10 cm unit. For example, when the adhesion between the outer cover 130 and one optical fiber 110 is 100 g / 10 cm, the adhesion of the 12-core optical fiber cable 100 becomes 1.2 kg or more. For another example, the adhesion of a two-core optical fiber cable is 0.2 kg or more.

When the optical fiber cable 100 is wound once into a cylinder having a radius of 5.0 mm, the optical loss at a wavelength of 1550 nm for any one of the optical fibers 110 is 0.1 dB or less.

2 is a cross-sectional view showing an optical fiber cable according to a second preferred embodiment of the present invention. FIG. 2 is a cross-sectional view of the optical fiber cable 200 taken along a direction perpendicular to the longitudinal direction of the optical fiber cable 200. As shown in FIG. The optical fiber cable 200 has a structure similar to the optical fiber cable 100 shown in FIG. 1 and includes only six optical fibers 210 and the optical fibers 210 are disposed on the outer side of the openings 220. Therefore, redundant description will be omitted. The optical fiber cable 200 is a six-core optical fiber cable having six optical fibers 210, and has a diameter of 1.4 mm or less.

3 is a cross-sectional view showing an optical fiber cable according to a third preferred embodiment of the present invention. 3 is a cross-sectional view showing the optical fiber cable 300 cut in a direction perpendicular to the longitudinal direction. The optical fiber cable 300 shown in FIG. The optical fiber cable 300 has a structure similar to that of the optical fiber cable 100 shown in FIG. 1 and includes only two optical fibers 310 and the optical fibers 310 are disposed on the outer side of the openings 320. Therefore, redundant description will be omitted. The optical fiber cable 300 is a two-core optical fiber cable having two optical fibers 310, and has a diameter of 1.1 mm or less.

In the optical fiber cable according to the present invention, at least one opening may be disposed on the outside and / or inside of the optical fibers. That is, one or a plurality of openings may be disposed only on the inner side of the optical fibers, or one or more openings may be disposed only on the outer side of the optical fibers, or a plurality of openings may be disposed on both the inside and outside of the optical fibers.

100: optical fiber cable, 110: optical fiber, 120: first inspection, 122: second inspection, 130:

Claims (8)

In an optical fiber cable,
A plurality of optical fibers;
A first aperture having an absorbing property disposed inside the optical fibers;
A second aperture having a flame retardancy disposed outside the optical fibers;
Wherein the optical fiber cable is located at an outermost portion of the optical fiber cable, and comprises only the outer coatings surrounding the optical fibers and the first and second optical fibers. The method according to claim 1,
Wherein when the number of the optical fibers is 2, the optical fiber cable has a diameter of 1.1 mm or less, and when the number of the optical fibers is 6, the optical fiber cable has a diameter of 1.4 mm or less, Wherein the cable has a diameter of 1.7 mm or less. The method according to claim 1,
Wherein the first and second inspections are each made of a fiber reinforced plastic yarn, an aramid reinforced plastic yarn, a polypropylene yarn, a polyester yarn, an aramid yarn or a glass yarn. delete The optical fiber cable according to claim 1, wherein the optical fiber cable has an adhesion of 200 g / 10 cm or more. The optical fiber cable according to claim 1, wherein each of the optical fibers has a diameter of 250 mu m or less. The method according to claim 1,
Wherein when the optical fiber cable is once wound around a cylinder having a radius of 5.0 mm, the optical loss at a wavelength of 1550 nm for each of the optical fibers is 0.1 dB or less. The optical fiber cable according to claim 1, wherein the outer cover is made of polyolefin, polyethylene, polyvinyl chloride, Hytrel or nylon.

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