KR20150140180A - Optical cable - Google Patents

Abstract

The present invention relates to an optical cable used for a quarter communications network of a passive optical network (PON). User work convenience is increased and a diameter of the optical cable is minimized. The optical cable comprises: a center line; a first optical unit layer prepared around the center line, including a plurality of optical units; a second optical unit layer prepared around the first optical unit layer, including a plurality of optical units; and an outside sheath layer enclosing a circumference of the second optical unit layer.

Description

OPTICAL CABLE

The present invention relates to an optical cable. More particularly, the present invention relates to an optical cable used in a branch communication network of a passive optical network (PON), in which an operator's workability is improved and a diameter is minimized.

Recently, there has been an accelerating transition from high-speed Internet to DSL (Digital Subscriber Line) based on a telephone line to fiber-to-the-home (FTTH) based systems.

In a fiber-to-the-home (FTTH) network, passive optical network (PON) technology uses a passive branching device that does not require power to be used as a remote node (RN) ) Based optical network technology.

PON technology is classified into two types according to the types of remote nodes and the multiple access methods associated therewith. One is time division multiplexing (TDM) PON technology using optical-power branching device as a remote node, and the other is wavelength branching WDM (wavelength division multiplexing) -PON technology that uses the device as a remote node.

1G-EPON and G-PON, which are two technologies of TDM-PON that use optical-power branching device as a remote node, enable Gigabit FTTH construction, and 1G-EPON has a bandwidth of 1Gb / s In general, up to 32 subscribers can share bandwidth while G-PON provides 2.5 Gb / s downward and 1.25 Gb / s upward.

An optical splitter is an essential element in constructing such a TDM-PON network.

In the case of having such a network configuration, the splitter is located in the connection enclosure or the branch box, so that at least one splitter is mounted on each connection box as needed. And it connects with splitter using optical cable for connection.

An optical cable can be used for connection of a branch communication network connected to a user via an optical line terminal (OLT) of a passive optical network (PON) via a splitter. An optical cable used in such a branch communication network is a Loose Tube There is optical cable. The optical cable of the Loose Tube system includes a plurality of optical units in a loose tube type optical cable. Each optical unit accommodates a plurality of optical fibers in the loose tube and is filled with waterproof jelly for waterproofing Is often used.

When connecting a routed tube type optical cable to a connection housing, each loose tube must be detached and connected. Therefore, the waterproof jelly filled in the loose tube constituting each optical unit must first be removed, and the respective optical fibers should be connected after removing the coating of each optical fiber. The process of removing the waterproof jelly in the loose tube requires a lot of work time of the operator and becomes a dark fiber which is not connected and discarded when a plurality of all optical fibers in one loose tube are not connected have.

In order to solve this problem, an optical cable composed of a light buffer type optical unit other than a loose tube type is introduced. Optical cables composed of optical units of tight buffer type are mainly used for indoor use, and no products having a sufficient number of multi-optical units for meeting the increased demand for outdoor installation such as processing are not disclosed.

In addition, in order to use equipment such as various connection boxes on a branch communication network connected to a user via a splitter in an existing optical line terminal (OLT), the increase in diameter should be minimized as compared with a cable used conventionally.

Conventional products satisfying both the existing network environment, the tight buffering method and the multi-core condition include a plurality of sub-cables in one optical cable, and a plurality of tight buffer type optical units in the sheath layer of each sub- However, since the worker has to process all the optical units that are not connected by peeling off the sheath layer of all the sub-cables constituting one optical cable, the workability is greatly reduced and the diameter of the optical cable There is a problem that the diameter is large to be applied to the equipment on the existing communication network.

Disclosed herein is an optical cable used in a branch communication network of a passive optical network (PON), in which an operator's work convenience is improved and an optical cable with a minimum diameter is provided.

According to an aspect of the present invention, there is provided a light emitting device comprising a first optical unit layer including a center line, a center line, and a plurality of optical units each including an optical fiber and a cover layer, A second optical unit layer including a plurality of optical units each composed of an optical fiber and a coating layer, and an outer sheath layer surrounding the periphery of the second optical unit layer.

In this case, the first optical unit layer or the second optical unit layer may be arranged so that a plurality of optical units are closely adjacent to each other.

Further, the second optical unit layer may be arranged such that a part of the plurality of optical units is spaced apart from each other.

Further, the partition layer may be an auxiliary tensile material.

The auxiliary tensile material may be any one of aramid yarn, glass yarn and glass fiber reinforced plastic (FRP).

In this case, an inner sheath layer may further be provided outside the auxiliary tensile material.

A rib cord may be provided inside at least one of the inner sheath layer and the outer sheath layer.

Preferably, the hardness of the outer sheath layer is greater than the hardness of the inner sheath layer.

In this case, the outer sheath layer may be formed of a low smoke zero halogen (LSZH) material having a Shore D hardness of 55 or higher.

The number of the optical units included in the first optical unit layer and the second optical unit layer may be the same or the number of the second optical unit layers may be greater.

The center line may include a center bar and a coating layer surrounding the center bar.

The center bar may be any one of a glass fiber reinforced plastic (FRP), a steel wire, a stranded wire and an aramid reinforced plastic (ARP). The coating layer may be made of polyethylene (PE) or polyvinyl chloride (PVC) Or polyurethane.

In this case, each of the optical unit layers may further include at least one waterproof yarn which is spirally wound along the longitudinal direction of the optical cable.

Further, in order to solve the above-mentioned problems, the present invention provides a light emitting device comprising: a center rod coated with a coating layer; n tight buffer optical units including n tight buffer optical units or at least one interposing unit around the center rod; (N is a natural number of 2 or more) layer, a partition layer disposed between each optical unit layer for partitioning each of the optical unit layers, and a partition layer disposed between the outermost optical unit layer out of the optical unit layers And an outer sheath layer surrounding the outer sheath layer.

Here, the total number of optical units and intervening units provided in the N layer may be smaller than the total number of optical units and intervening units of the (N-1) th layer.

The number of intervening units provided in the N layer may be equal to or greater than the number of intervening units in the N-1 layer.

In this case, the N-1 optical unit layers other than the outermost optical unit layer of the N optical unit layers can be arranged adjacent to and in close proximity to the optical units constituting each optical unit layer.

Further, the partition layer may include at least one of an auxiliary tensile material, a waterproof tape, and an inner sheath layer.

Further, the optical module may further include an outer sheath layer surrounding the outermost optical unit layer of the optical unit layer.

The optical unit layer may further include at least one of an auxiliary tensile material and a waterproof tape between the outermost optical unit layer and the outer sheath layer.

According to the optical fiber according to the present invention, when the total number of optical units is the same, the wasted space in the optical cable can be reduced, and the diameter of the optical cable can be minimized.

Further, according to the optical cable according to the present invention, when the total number of optical units is the same, the diameter of the optical cable can be minimized, so that the weight and cost of the product can be minimized.

Further, according to the optical cable according to the present invention, even when an operator disconnects a part of optical units included in an optical cable in an optical connection box or the like, a plurality of optical units are exposed except for one shell, It is possible to maximize the efficiency of the processing of the hair processing of the optical units of FIG.

Further, according to the optical cable of the present invention, even if the number of optical units constituting the optical cable is increased, the increase of the diameter of the cable is minimized. Therefore, The possibility of using equipment such as a connecting box without replacement is improved.

Further, according to the optical cable of the present invention, since the hardness of the outer sheath layer is made larger than that of the inner sheath layer or larger than that of the conventional outer sheath layer, even when a plurality of optical cables are installed together on the branch communication network, can do.

1 shows one embodiment of an optical cable according to the present invention.
Fig. 2 shows another embodiment of the optical cable according to the present invention.
3 shows another embodiment of an optical cable according to the present invention.
Fig. 4 shows another embodiment of the optical cable according to the present invention.
FIG. 5 is a diagram comparing diameters of optical fibers according to the present invention and conventional optical fibers.
Figs. 6 to 8 show an embodiment in which a part of the optical units constituting each optical unit layer in the embodiment shown in Figs. 1, 2 and 4 is replaced with an intervening unit.

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 but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like reference numerals designate like elements throughout the specification.

Fig. 1 shows one embodiment of an optical cable 1 according to the present invention. Specifically, FIG. 1 shows a cross-sectional view of one embodiment of an optical cable in which the first optical unit layer 100 and the second optical unit layer 200 are each provided with 24 tight buffer optical units.

2 shows another embodiment of the optical cable 1 according to the present invention.

2 is a cross-sectional view of another embodiment of an optical cable having 16 tight buffer optical units 120 and 220 in the first optical unit layer 100 and 32 optical buffer units 200 and 220 in the second optical unit layer 200 do.

An optical fiber 1 according to the present invention includes a center line 10 and a first optical fiber 12 including a plurality of optical units 120 provided around the center line 10 and each composed of an optical fiber 121 and a coating layer 123, A second optical unit layer 200 including a plurality of optical units 220 provided around the first optical unit layer 100 and composed of an optical fiber 221 and a coating layer 223, And an outer sheath layer 280 surrounding the periphery of the second optical unit layer 200.

The center line 10 may be provided to prevent optical fiber damage due to tensile force or compressive force in the longitudinal direction of the optical cable 1 according to the present invention, compressive force applied toward the center of the optical cable, and moment applied to the optical cable.

Accordingly, the center line 10 may include a center bar 11 extending along the longitudinal direction of the optical cable, and a coating layer 13 coated on the outer surface of the center bar 11.

Here, when the number of optical units constituting the first optical unit layer 100 disposed outside the center line 10 is small, the diameter of the center line 10 must also be reduced, so that the coating layer may be omitted. Conversely, when the number of optical units is increased, the coating layer 13 may be provided or its thickness may be increased.

The center rod 11 may be made of glass fiber reinforced plastic (FRP) which is stronger than iron and lighter than aluminum. When the center rod 11 is formed of a glass fiber reinforced plastic (FRP) material, tensile force, compressive force, or moment applied from the outside can be concentrated on the center rod 11, and damage to the optical fiber can be prevented.

In addition to the glass fiber reinforced plastic (FRP), the center rod 11 may be made of a plastic material such as an aramid reinforced plastic (ARP), or a metal material such as a steel wire or a stranded wire.

The coating layer 13 may be formed of a polymer material such as polyethylene (PE), polyvinyl chloride (PVC), low smoke zero halogen (LSZH) or polyurethane, but is not limited thereto. The coating layer 13 can function as a cushion even if a compressive force is applied to the center of the optical cable 1 from the outside, so that damage of the optical fiber due to the compressive force can be prevented.

As will be described later, in the case of an optical cable having a conventional tight buffer type optical unit, it is general that it is mainly used as an indoor unit and does not have a center line having a cushion function inside thereof.

However, since the optical cable 1 according to the present invention can be used as an outdoor distribution cable, since all the optical units can be composed of a tight buffer type optical unit, the center line 10 provided with the coating layer 13 Physical impact including tensile force, compressive force or moment, and the like can be alleviated or eliminated.

The optical cable 1 according to the present invention shown in FIGS. 1 and 2 is provided around the center line 10 in parallel with the center line 10 and is composed of an optical fiber 121 and a cover layer 123, And may include a plurality of optical units 120 constituting one optical unit layer 100.

The optical unit 120 constituting the first optical unit layer 100 is disposed on the outer circumferential surface of the center line 10 and arranged in parallel with the center line 10 or in a manner of being helically or SZ- . In this case, the optical units 120 constituting the plurality of first optical unit layers 100 may be arranged so as to be arranged side by side in the circumferential direction of the center line 10 without being overlapped or laminated in the radial direction of the optical cable.

1 and 2, the first optical unit layer 100 may be arranged so that a plurality of optical units 120 are closely adjacent to each other in order to maximize the number of optical units 120 . That is, the number of optical units 120 and 220 included in the first optical unit layer 100 and the second optical unit layer 200 constituting the embodiment shown in FIGS. The second optical unit layer 200 may be more.

The optical units 120 and 220 constituting the first optical unit layer 100 and the second optical unit layer 200 to be described later are disposed at the center of the optical fibers 121 and 221 and the optical fibers 121 and 221 And optical buffers 123 and 223 surrounding the optical fibers 121 and 221 on the outer circumferential surface.

At this time, the plurality of optical units 120 and 220 constituting the first optical unit layer 100 and the second optical unit layer 200 may be arranged parallel to the center line 10 However, it may be wound in a spiral or SZ shape with respect to the center line 10.

When the optical fiber 1 according to the present invention is used in a branch communication network connected to a user via an optical line terminal OLT of a passive optical network PON via a splitter, It is possible to omit the process of removing the jelly in the process of removing the tight buffer, so that the work time of the operator can be minimized.

Even if each optical unit is composed of optical units of tight buffer type, it is not constituted by the respective layers centered on the center line 10 like the optical cable 1 according to the present invention, but is divided into several groups, Conventional distribution cables using a method of covering with a member or a sheath layer or the like require to remove all of the sheath members of the grouped cables from the connection box and then process the respective optical units by armor processing so that the workability is increased, It can fall. This will be described later with reference to FIG.

A partition layer for partitioning the first optical unit layer 100 and the second optical unit layer 200 may be provided outside the first optical unit layer 100 composed of a plurality of optical units 120 .

The partition layer may include at least one of an auxiliary tensile material 160, a waterproof tape, and an inner sheath layer 180.

Although the embodiment shown in FIGS. 1 and 2 is shown as having two auxiliary tensile members 160 and an inner sheath layer 180 as the partition layers, the first optical unit layer 100 and the second optical unit Only one of the auxiliary tensile material 160 and the inner sheath layer 180 may be used as the partition layer for partitioning the layer 200, or a waterproof tape may be added or used alone.

1 and 2, the auxiliary tensile material 160 is positioned outside the first optical unit layer 100 to maintain the attitude of the optical unit, and at the same time, from the tensile force externally applied, The optical unit constituting the unit layer 100 can be protected.

Accordingly, the auxiliary tensile material 160 may be provided to surround the outside of the first optical unit layer 100 composed of the plurality of optical units 120 in the longitudinal direction of the optical cable. The auxiliary tensile material 160 may be a method of wrapping the outside of the first optical unit layer 100 composed of a plurality of the optical units 120, for example, in a helical manner.

The auxiliary tensile material 160 may be made of aramid yarn, glass yarn or glass fiber reinforced plastic (FRP), but is not limited thereto. In addition, the aramid yarn may be used in a waterproof coating state.

The inner sheath layer 180 may be provided outside the auxiliary tensile material 160. The inner sheath layer 180 is a member located outside the first optical unit layer 100 and is disposed outside the auxiliary tensile member 160 to protect the members located therein, The first optical unit layer 100 may be divided into a mounting surface on which the optical unit constituting the unit layer 200 can be mounted or a first optical unit layer 100 to be described later.

The inner sheath layer 180 may be made of a polymer material such as polyethylene or a flame retardant polyethylene (PVC). The inner sheath layer 180 may be formed of a low smoke zero halogen (LSZH).

At least one lip cord 70 may be provided inside the inner sheath layer 180 for stripping the inner sheath layer 180 during connection.

And the optical unit 220 constituting the second optical unit layer 200 may be provided on the outer surface of the inner sheath layer 180.

The number of optical units 220 constituting the second optical unit layer 200 shown in FIG. 1 may be the same as the number of optical units 120 constituting the first optical unit layer 100.

The length of the outer circumferential periphery of the center line 10 providing the mounting surface of the first optical unit layer 100 shown in FIG. 1 is greater than the length of the inner sheath layer 180 constituting the mounting surface of the second optical unit layer 200 If the same number of optical units are provided in the first optical unit layer 100 and the second optical unit layer 200, the optical length of the light emitted from the second optical unit layer 200 The units are not disposed adjacent to each other, but each optical unit can be arranged with a sufficient margin and spaced apart as shown in Fig.

On the other hand, in the optical cable shown in FIG. 2, the first optical unit layer 100 includes 16 optical units 120, and the second optical unit layer 200 includes 32 optical units 220 . In the embodiment shown in FIG. 2, the length of the outer circumference of the center line 10 providing the mounting surface of the first optical unit layer 100 is longer than the length of the inside 16 light units are mounted on the mounting surface of the first light unit layer 100 and 32 light units are mounted on the second light unit layer 200 since the length of the outer circumference of the sheath layer 180 is shorter And the 32 optical units 220 disposed in the second optical unit layer 200 may be arranged adjacently and tightly as in the first optical unit layer 100. [

As will be described later, in the case of an optical cable having a plurality of optical units, if the optical units are arranged in a multilayer and optical units constituting each optical unit layer are disposed adjacent to each other, the diameter of the optical cable can be minimized have.

For reference, in order to arrange optical units in the first optical unit layer 100 and the second optical unit layer 200, a greater number of the second optical unit layers 200 are arranged, A method of adjusting the thickness of the coating layer of the substrate 10 may be used.

An outer sheath layer 280 may be provided outside the second optical unit layer 200 according to the present invention shown in FIGS.

Like the inner sheath layer 180, the outer sheath layer 280 may be made of a polymer material such as polyethylene or flame retardant polyethylene. However, the outer sheath layer may be composed of a low smoke zero halogen (LSZH) It is possible.

The inner sheath layer 180 may be formed of a material having a refractive index higher than that of the inner sheath layer 180. The inner sheath layer 180 may include a first optical unit layer 100 and a second optical unit layer The outer sheath layer 280 is exposed to the outside and is exposed to the outside. When friction occurs between the outer sheath layer 280 and another working cable which is installed together, In order to minimize damage, it is desirable that the hardness is high. Specifically, the hardness of the outer sheath layer preferably has a D-type hardness of the shore scleroscope of 55 or more. The hardness number measured by a Shore hardness meter is called Shore hardness (Hs). The Shore hardness of the outer sheath layer according to the present invention is experimentally measured to be about 58, and it can be confirmed that sufficient durability is secured when the optical cable according to the present invention is installed with the working line.

The thickness of the outer sheath layer may be greater than the thickness of the inner sheath layer 180. The inner sheath layer 180 has a greater function to divide the optical unit layer than the side of the cable protection and to provide the mounting surface of the second optical unit layer 200, It is preferable that the thickness of the insulating layer 280 is smaller than the thickness of the insulating layer 280.

At least one of the auxiliary tensile material 160 and the waterproof tape 290 may be provided inside the outer sheath layer 280.

1 and 2, the auxiliary tensile material 260 and the waterproof tape 290 are shown as being provided between the second optical unit layer 200 and the outer sheath layer, Or only the waterproof tape 290 may be used.

As shown in FIGS. 1 and 2, the auxiliary tensile material 260 disposed outside the second optical unit layer 200 is located outside the second optical unit layer 200, The auxiliary tensile material 260 can protect the optical unit constituting the second optical unit layer 200 from the tensile force externally applied thereto while the second optical unit 220 is maintained, The auxiliary tensile material 260 may be provided to surround the outside of the unit layer 200 in the longitudinal direction of the optical cable and the auxiliary tensile material 260 may be provided in a manner to surround the outside of the second optical unit layer 200 composed of a plurality of the optical units 220 The auxiliary tensioning material 260 may be formed of aramid yarn, glass yarn, or glass fiber material. The auxiliary tensioning material 260 may be made of aramid yarn, glass yarn or glass fiber, Reinforced plastic (FRP), etc. can be used The aramid yarn may be used in a waterproof coating state, but is not limited thereto.

 At least one rib cord 270 may be provided between the auxiliary tensile material 260 and the outer sheath layer 280 for stripping the inner sheath layer 280 during connection.

That is, each of the sheath layers of the optical cables shown in Figs. 1 and 2 may have a rib cord for ripping the rip cord therein.

In addition, it may further include at least one waterproof yarn (150, 250) spirally wound along the longitudinal direction of the optical cable in the surplus space of each optical unit layer. The waterproof yarn absorbs and expands water during flooding to prevent further flooding.

3 shows another embodiment of the optical cable 1 according to the present invention.

Specifically, FIG. 3A shows a case where twenty-four tight buffer optical units are provided in the first optical unit layer 100, the second optical unit layer 200 and the third optical unit layer 300 3 (b) shows a cross-sectional view of an embodiment of the optical fiber provided with 16 pieces in the first optical unit layer 100, 32 pieces in the second optical unit layer 200, and 32 pieces in the third optical unit layer 300 Sectional view of an embodiment of an optical cable with 48 tight buffered optical units.

The description with reference to FIGS. 1 and 2 will be omitted.

In the embodiment shown in FIGS. 3A and 3B, three optical unit layers are provided in each optical cable, and in the embodiment shown in FIG. 3A, a total of 84 optical units are provided And the embodiment shown in FIG. 3 (b) is an embodiment in which 96 optical units are provided.

That is, the number of the optical units constituting each optical unit layer may be made different, or the optical units constituting the outermost optical unit layer may be disposed apart from each other at regular intervals as shown in Fig. 3 (a) b, as shown in Fig.

Therefore, the optical cable 1 according to the present invention includes a center bar 10 coated with a coating layer, N (a number of) light blocking units in which n (a natural number of one of multiples of 4) N is a natural number of 2 or more) layers of optical unit layers 100, 200, 100 * N, and optical unit layers 100, 200, 100 * N, And an outer sheath layer surrounding the outermost optical unit layer out of the optical unit layers 100, 200, and 100 * N.

That is, in order to minimize the diameter of the optical cable, N optical unit layers 100, 200, 100 * N are provided, and each optical unit layer 100, 200, 100 * and n optical units.

In the embodiments shown in FIG. 3, N is 3, and the embodiment shown in FIGS. 1 and 2 is N = 2.

With respect to the number of optical units provided in each optical unit layer, the embodiment shown in Fig. 3 (a) is such that n is 24, 36 and 24, respectively, and the embodiment shown in Fig. 16, 32, and 48, respectively. In the embodiment shown in Figs. 1 and 2, the embodiment shown in Fig. 1 has n of 24 and 24, respectively, and the embodiment shown in Fig. 2 has n of 16 and 32, respectively.

In the embodiment shown in Figs. 1 to 3, it can be confirmed that n is one of 16, 24, 32, 36 and 48 for each optical cable.

Since the optical unit included in the optical cable can be divided into 12 colors and the number of dots (or lines) marked on the outer cover, the total number of optical units provided in the optical unit layer of the N layer is 12 The embodiments shown in Figs. 1, 2, 3 (a) and 3 (b) have 48, 48, 84 and 96 optical units, respectively, do.

Accordingly, by adjusting the number N of layers, the number n of optical cables disposed in each optical unit layer and the diameter of the center line 10 according to the demand of the optical cable user or the like, the optical cable with the smallest diameter can be obtained while securing the same number of optical units Can be designed.

In the optical cable 1 according to the present invention, since the optical cables disposed in the outermost optical unit layer can be arranged as necessary, the number of N-1 optical unit layers excluding the outermost optical unit layer The optical unit layer may be interpreted such that the optical units constituting each optical unit layer are arranged adjacent to each other and closely arranged.

And, a partition layer may be provided between each of the optical unit layers 100, 200, 100 * N, and the partition layer may include at least one of an auxiliary tensile material, a waterproof tape and an inner sheath layer 3 (a) and 3 (b) show the supplementary tensile materials 160 and 260 and the inner sheath layers 180 and 280, respectively, but a waterproof tape may be added.

3 may also include an outer sheath layer 380 surrounding the outermost optical unit layer 300 out of the optical unit layers 100, 200, and 300, The auxiliary tensile material 360 and the waterproof tape 390 may be further included. The outer sheath layer may be provided with only one of the external tensile material and the waterproof tape.

The embodiment shown in FIGS. 3 (a) and 3 (b) is also provided with the respective sheath layers 180, 280 and 380 inside the respective sheath layers 180, 280 and 380, At least one rib cord 170, 270, 370 for stripping the optical fiber layer 280, 380 can be provided, and at least one waterproof yarn, which spirally traverses along the longitudinal direction of the optical cable, (150, 250, 350).

Fig. 4 shows another embodiment of the optical cable 1 according to the present invention.

Specifically, Fig. 4 (a) shows a cross-sectional view of another embodiment of the optical cable 1 having 24 optical units in the first optical unit layer 100 and 24 optical units in the second optical unit layer 200, Fig. 4 (b) shows a cross-sectional view of another embodiment of the optical cable in which 24 optical unit layers are provided in the first optical unit layer 100 and 24 optical unit layers in the second optical unit layer 200. Fig.

The description with reference to FIGS. 1 to 3 will be omitted, and differences will be mainly described.

The embodiment shown in Figs. 4 (a) and 4 (b) omits the inner sheath layer 180 to further minimize the diameter of the optical fiber 1 according to the present invention in which the optical unit layer is composed of a plurality of layers, As shown in Fig. 4 (a), when only the auxiliary tensile material 160 is used as a partition layer for partitioning the first optical unit layer 100 and the second optical unit layer 200, only the waterproof tape 190 may be applied as shown in FIG.

Even if the inner sheath layer is omitted, the auxiliary tensile material 160 or the waterproof tape 190 for partitioning the first optical unit layer 100 and the second optical unit layer 200 is provided, And a function of providing a mounting surface for mounting the optical unit constituting the second optical unit layer 200 can also be performed.

Of course, in constituting the partition layer, it may be constituted by various combinations of at least two or more of the auxiliary tensile material, the waterproof tape and the inner sheath layer so as to physically compartmentalize the optical unit layer and to provide various additional functions.

5 is a diagram comparing the diameter of the optical cable 1 according to the present invention and the conventional optical cable.

Specifically, FIG. 5 (a) is a schematic view of the present invention in which 16 tight buffer optical units are provided in the first optical unit layer 100 and 32 tight buffer optical units in the second optical unit layer 200, 5 (b) and 5 (c) are cross-sectional views of the optical cables 1 'and 1 "in which 48 optical units are provided in four and six grouped states, respectively, Fig.

The optical cable shown in Fig. 5 (a) is the optical cable shown in Fig. 2 including 48 optical units. The first optical unit layer 100 and the second optical unit layer 200 are provided with 16 and 32 optical units, respectively, and both the first optical unit layer 100 and the second optical unit layer 200 The optical unit is arranged to minimize the surplus space generated in the inner space of the outer sheath layer.

The embodiment shown in Figure 5B has four sub-cables 150b in one optical cable and each sub-cable 150b has twelve optical units 120b and a tensile material 130b And the sub-sheath layer 140b. The embodiment shown in Fig. 5 (c) has six sub-cables 150c in one optical cable, and each sub-cable 150c has eight optical units A tensile member 130c and a sub-sheath layer 140c surrounding the optical unit assembly.

It can be seen that the relationship of the diameters D1, D2 and D3 of each optical cable shown in Figs. 5 (a), 5 (b) and 5 (c) is a relationship of D1 <D2 <D3. As a result of measurement of the actual product, D1 was 14.5 millimeters (mm), D2 was 18.5 millimeters (mm), D1 was 19.7 millimeters (mm) It was confirmed that the shape was minimized in diameter.

That is, increasing the number of sub-cables in the optical cable including the same number of optical units means that the amount of sub-sheath layers for wrapping each sub-cable is increased in the inner space surrounded by the outer sheath layer, The diameter is inevitably increased.

In addition, since the sub-cable having a circular cross-section in the inner space surrounded by the outer sheath layer itself, it means the generation of wasted space between each sub-cable, and the optical cable diameter will be increased. If the diameter of the optical cable is increased, the cost increase and the volume of the connection box for the optical cable connection also increase, which is not desirable.

Also, if the number of sub-cables provided in the inner space enclosing the outer sheath layer increases, the number of sheath layers to be peeled off in the optical connection box increases.

That is, when the optical cable 1 according to the present invention is used in a branch communication network connected to a user via an optical line terminal OLT of a passive optical network (PON) via a splitter, The number of sheath layers to be peeled off is 2, 5 and 7, respectively, in order to expose all of the optical units of the optical cables shown in Figs. The optical cable 1 according to the present invention shown in Fig. 5 (a) is the most advantageous.

Figs. 6 and 7 show an embodiment in which a part of the optical units constituting each optical unit layer in the embodiment shown in Figs. 1 and 2 is replaced with a dummy unit.

Each of the optical unit layers constituting the optical cable according to the present invention is not necessarily composed of only optical units. 6, when the number of the optical units 220 constituting the second optical unit layer 200 is insufficient, at least one dummy unit is disposed apart from the optical unit 220 It is possible.

That is, when the optical unit 220 constituting the second optical unit layer 200 does not have a sufficient number of sections so that the optical cable can have a circular cross section, as shown in FIG. 6, a plurality of interposing units 220d ). &Lt; / RTI &gt;

However, the intervening unit does not necessarily have to be disposed only in the outermost optical unit layer.

That is, as shown in FIG. 7, when the number of the optical units 120 and 220 constituting the first optical unit layer 100 and the second optical unit layer 200 are respectively formed as a seamless structure In the case where it is insufficient, it may be added to the optical unit layer other than the outermost optical unit layer (the first optical unit layer 100 in the embodiment shown in Fig. 7).

In the embodiment shown in Fig. 8 (a), part of the optical unit 220, 320 constituting the second optical unit layer 200 arranged in the middle and the third optical unit layer 300 arranged at the outermost part 8B can be replaced by intervening units 220d and 320d, respectively. The embodiment shown in FIG. 8B includes a first optical unit layer 100, a second optical unit layer 200, And at least one intervening unit (120d, 220d, and 320d) of all optical unit layers, such as the third optical unit layer (300).

The optical cable according to the embodiment shown in Figs. 6 to 8 includes a total of n tight buffer optical units including a center rod coated with a coating layer, n tight buffer optical units around the center bar or at least one intervening unit, (N is a natural number of 2 or more) layers in which units are arranged, a partition layer disposed between each of the optical unit layers for partitioning each of the optical unit layers, and an outermost light And an outer sheath layer surrounding the exterior of the unit layer.

The total number of optical units and intervening units provided in the Nth layer as the outermost optical unit layer may be equal to or greater than the total number of optical units and intervening units in the (N-1) th layer.

Specifically, in the embodiment shown in Figs. 6, 7, and 8 (b), the total number of optical units and intervening units provided in the N layer is the sum of the N-1th optical unit and the intervening unit It is possible to confirm that it can be configured to be equal to or greater than the number.

6 to 8, the structure of the partition layer is shown to include both the inner sheath layer and the auxiliary tensioning material. However, as in the embodiment shown in FIG. 4, the auxiliary tensioning material and the waterproofing tape are separately provided Or may be configured to provide various additional functions while physically partitioning the optical unit layer in at least two or more various combinations in the auxiliary tensile material, the waterproof tape and the inner sheath layer.

While the present invention has been particularly shown and described with reference to preferred embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the following claims. . It is therefore to be understood that the modified embodiments are included in the technical scope of the present invention if they basically include elements of the claims of the present invention.

10: Center line
100, 200, 300: optical unit layer
120, 220, 320: optical unit
120d, 220d: interposing unit
160, 260, 360: Auxiliary tensile material
180, 280, 380: Sheath layer

Claims (19)

center line;
A first optical unit layer provided around the center line and including a plurality of optical units each composed of an optical fiber and a cover layer;
A second optical unit layer provided around the first optical unit layer and including a plurality of optical units each composed of an optical fiber and a cover layer; And
And an outer sheath layer surrounding the periphery of the second optical unit layer. The method according to claim 1,
Wherein the first optical unit layer or the second optical unit layer is disposed so that a plurality of optical units are closely adjacent to each other. 3. The method according to claim 1 or 2,
Wherein the second optical unit layer is disposed such that a part of the plurality of optical units is spaced apart from the optical unit. The method according to claim 1,
And a partition layer for partitioning each optical unit layer between the first optical unit layer and the second optical unit layer. 5. The method of claim 4,
Wherein the partition layer is at least one of an auxiliary tensile material, a waterproof tape, and an inner sheath layer. 6. The method of claim 5,
Wherein said auxiliary tensile material is one of aramid yarn, glass yarn or glass fiber reinforced plastic (FRP). 5. The method of claim 4,
Wherein the partition layer comprises an auxiliary tensile material and an inner sheath layer formed on an outer side thereof. 8. The method of claim 7,
Wherein at least one of the inner sheath layer and the outer sheath layer is provided with a lip cord inside the sheath layer. 8. The method of claim 7,
Wherein the hardness of the outer sheath layer is greater than the hardness of the inner sheath layer. 10. The method of claim 9,
Wherein the outer sheath layer is formed of a low smoke zero halogen (LSZH) material having a Shore D hardness of 55 or higher. The method according to claim 1,
Wherein the total number of optical units or intervening units provided in the first optical unit layer and the second optical unit layer is the same or more than that of the second optical unit layer. The method according to claim 1,
Wherein the center line includes a coating layer surrounding the center bar and the center bar. 13. The method of claim 12,
Wherein the center rod is any one of a glass fiber reinforced plastic (FRP), a steel wire, a stranded wire and an aramid reinforced plastic (ARP), the coating layer being made of polyethylene (PE) or polyvinyl chloride (PVC), low smoke zero halogen Wherein the optical fiber is one of polyurethane. The method according to claim 1,
Further comprising: at least one waterproof yarn wound on each of the optical unit layers in a spiral shape along the longitudinal direction of the optical cable. A center rod coated by a coating layer;
An optical unit layer of N (N is a natural number of 2 or more) layer in which n tight buffer optical units including n tight buffer optical units or at least one interposing unit and N intervening units are arranged around the center bar;
A partition layer disposed between each of the optical unit layers for partitioning each of the optical unit layers; And
And an outer sheath layer surrounding the outermost optical unit layer out of the optical unit layers. 16. The method of claim 15,
Wherein the total number of optical units and intervening units provided in the N layer is greater than the total number of optical units and intervening units in the (N-1) th layer. 16. The method of claim 15,
Wherein the N-1 optical unit layers excluding the outermost optical unit layer of the N optical unit layers are arranged so that the optical units constituting each optical unit layer are arranged adjacently and closely. 16. The method of claim 15,
Wherein the partition layer comprises at least one of an auxiliary tensile material, a waterproof tape and an inner sheath layer. 16. The method of claim 15,
Further comprising at least one of an auxiliary tensile material and a waterproof tape between the outermost optical unit layer and the outer sheath layer of the optical unit layer.

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