KR101650612B1 - Optical cable - Google Patents

Abstract

The present invention is an optical cable used in a branch communication network connected to a user via an optical line terminal (OLT) of a passive optical network (PON), minimizes wasteful dark fiber not connected to a splitter, To an optical cable capable of improving work efficiency of a worker in connection work and improving the usability of an inner space such as a connection case.

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 connected to a user via an optical line terminal (OLT) of a passive optical network (PON), which is not connected to a splitter and is wasted, To an optical cable capable of improving work efficiency of an operator during an optical connection work and improving utilization of an inner space of a connection case or the like.

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. This means a passive splitting element that can divide one input signal into several equal parts and can process multiple signals as one signal.

In general, when a network is constructed using a splitter, a two level splitting method is often used.

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.

Such a routed tube type optical cable is mainly used for outdoor use but has the following problems when it 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.

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.

Another type of optical cable is a tight buffer optical cable, which is mainly developed for indoor use. Since the optical fiber of the tight buffer type has a plurality of optical units therein and each optical unit is tightly coated with the optical fiber as a cover layer, it is possible to individually connect the optical fibers to be connected without using the waterproof jelly, There is a problem.

In the case of a tight buffer type optical cable, when two or more connections are required in one connection enclosure or a dispenser, two or more units must be disconnected and each optical fiber must be connected.

Further, when the optical cable is connected through a splitter or the like provided inside the connection housing or the like, the cover is sufficiently removed by a necessary length to expose each optical unit, the cover of the optical unit to be connected is released, do. Therefore, in the case of a light unit in which the tight buffer is provided as a coating layer, other optical units bypassing the splitter except for the optical unit connected to the splitter are wound around the inside of the connection housing and must be treated as a sheath. Space can be increased.

The present invention relates to an optical cable that can be used in a distribution section of a PON-based technology. More specifically, the present invention reduces the connection or splitting operation time in the connection enclosure of the distribution section of the PON-based technology and minimizes the footprint or work space when connecting or splitting a plurality of optical fibers The present invention is directed to providing an optical cable provided with an optical cable.

According to an aspect of the present invention, there is provided an optical cable 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, At least one second optical unit provided between the first optical units and parallel to the center line and having at least two optical fibers, at least one second optical unit including at least two optical fibers, An auxiliary jacket surrounding the second optical unit, and an outer jacket surrounding the circumference of the auxiliary jacket.

In this case, the coating layer of the first optical unit may be a tight buffer composed of any one of materials such as polyvinyl chloride, low smoke zero halogen (LSZH), nylon, and thermoplastic elastomer (TPE) .

Here, the second optical unit may include a loose tube that accommodates a plurality of the optical fibers.

In addition, the loose tube can accommodate jangles for waterproofing or waterproofing.

In addition, the number of the optical fibers included in the first optical unit may be two or more.

In this case, the outer diameter of the second optical unit may be larger than the outer diameter of the first optical unit.

In addition, at least one dummy member may be included between the first optical unit and the second optical unit.

In this case, it may further comprise at least one waterproof yarn disposed between the center line and the optical unit layer composed of the first optical unit and the second optical unit, and horizontally helically winding the center line.

Here, a rib cord may be included between the auxiliary tensile material and the outer jacket.

In addition, the center line may be any one of glass fiber reinforced plastic (FRP), aramid reinforced plastic (ARP), steel wire and strand wire.

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

In this case, 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 polyethylene (PE) or polyvinyl chloride (PVC) ) Or polyurethane.

In addition, the auxiliary tensile material can be any one of aramid yarn, glass yarn, and glass fiber reinforced plastic (FRP).

According to another aspect of the present invention, there is provided a light source apparatus comprising: a plurality of tight buffer optical units arranged around a center line including a center bar and an outer envelope surrounding the center bar, and a tight buffer surrounding the optical fiber and the optical fiber, And at least one loose tube optical unit provided between the tight buffer optical units in parallel with the center line and including at least two optical fibers and a loose tube filled with waterproof jelly or waterproof yarn for accommodating the optical fibers can do.

When the optical cable according to the present invention is installed in a branch communication network connected to a user via an optical line terminal (OLT) of a passive optical network (PON) via a splitter, since the first optical unit is a plurality of tight buffer optical units, It is possible to omit the process of removing the waterproof jelly for connecting the splitter provided in the connection enclosure provided in the communication network, so that workability and efficiency of the connection operation can be increased.

In addition, when the optical cable according to the present invention is installed in 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 unit having a plurality of optical fibers is provided. Even when two or more splitters are required to be connected in a connection enclosure of a branch communication network of the branch network, only one optical unit can be detached and connected, so that the efficiency of the connection process can be improved, It is possible to minimize the processing space of the hair treatment process as compared with the case where the hair treatment apparatus is detached and connected to the splitter.

1 shows a cross-sectional view of one embodiment of an optical cable according to the present invention.
2 shows a cross-sectional view of a first optical unit and a second optical unit that can be applied to an optical cable according to the present invention.
Fig. 3 shows another embodiment of the optical cable according to the present invention.
Fig. 4 shows another embodiment of the optical cable according to the present invention.
5 shows another embodiment of the optical cable according to the present invention.

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.

1 is a cross-sectional view of one embodiment of an optical cable according to the present invention, and Fig. 2 is a cross-sectional view of a first optical unit 20 and a second optical unit 30 that can be applied to the optical cable shown in Fig. 1 do.

The present invention relates to an optical cable 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 optical cable according to the present invention includes a center line 10, A plurality of first optical units 20 provided around the center line 10 and each composed of an optical fiber and a coating layer 23 and disposed between the first optical units 20 in parallel with the center line 10, At least one second optical unit (30) having at least two optical fibers (31), an auxiliary tensile material (60) wrapping the first optical unit (20) and the second optical unit (30) And an outer jacket 80 that surrounds the outer jacket 60.

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 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, if the number of the first light unit 20 or the second light unit 30 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 sufficient, the coating layer 13 may be provided.

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 from the outside to the center of the optical cable 100, 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 10 having a cushion function therein. However, in the case of the optical cable according to the present invention, most of the optical units described below can be formed of a tight buffer type optical unit, so that the center line 10 provided with the coating layer 13 can be subjected to a physical impact including tensile force, compressive force, It can be mitigated or eliminated.

The optical fiber according to the present invention shown in FIG. 1 includes a plurality of first optical units 20 provided around the center line 10 in parallel with the center line 10 and each composed of an optical fiber and a cover layer 23 can do. The first optical unit 20 may be disposed on the outer circumferential surface of the center line 10 and may be arranged in a manner of being parallel to the center line 10 or in a spiral shape. In this case, the plurality of first optical units 20 may be arranged so as not to be laminated in the radial direction of the optical cable, but to be arranged side by side in the circumferential direction of the center line 10.

The first optical unit 20 may include a tight buffer system including an optical fiber 21 positioned at the center and a tight buffer 23 surrounding the optical fiber 21 on the outer circumferential surface of the optical fiber 21.

At this time, the plurality of first optical units 20 may be disposed parallel to the center line 10, as described above, but they may be arranged in a spiral form with respect to the center line 10.

When the optical fiber 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 first optical unit 20 is provided in a tight buffer manner Since the process of removing the separate jelly can be omitted in the process of peeling off the tight buffer, the work time of the operator can be minimized. In the case of splitting through the splitter in the connection case or the like, It is possible to minimize the generation of dark fibers generated in the conventional optical fiber of the loose tube type.

The optical fiber according to the present invention shown in Fig. 1 is provided between the first optical unit 20 which is parallel to the center line 10 or spirally surrounds the center line 10, and at least two optical fibers 31 may be included in the second optical unit 30.

The second optical unit 30 may include a loose tube 35 for accommodating a jig or a jig with the plurality of optical fibers 31. That is, the second optical unit 30 may be configured as a loose tube optical unit. The loose tube 35 may be made of, for example, a thermoplastic plastic (PBT) material.

In the embodiment shown in FIG. 1, the second optical unit 30 is shown as being provided between the first optical units 20, but the number of the second optical units 30 may be increased or decreased .

The second optical unit 30 shown in Fig. 1 is shown as having two telecommunication optical fibers 31 and one embroidery yarn 33 in a loose tube.

However, depending on communication capacity or other needs, the number of optical fibers may be further increased, the waterproofing yarn for waterproofing may be omitted or the number may be increased, and waterproofing jelly may be substituted for waterproofing if necessary.

Since the second optical unit 30 constituted by the loose tube optical unit is provided with a plurality of optical fibers by removing one loose tube, when it is necessary to connect two or more splitters in one connection housing, It is possible to minimize the time required for removing the optical fibers 20 from the optical unit 20 in order to expose the respective optical fibers.

That is, when two or more splitters are provided in the inside of the connection housing and the connection of two or more optical fibers is required, the working time can be greatly reduced as compared with an optical cable composed only of a tight buffer.

1, the first optical unit 20 and the second optical unit 30 have a clearance generated between the optical unit layer 40 formed by the optical unit and the auxiliary tensile material 60 And may have a corresponding outer diameter for maintaining the overall circular cross-section.

However, since the second optical unit in the form of a loose tube optical unit has a certain degree of elasticity or compression space, the outer diameter of the second optical unit can be made larger than the outer diameter of the first optical unit. Further, in order to form a circular cross-sectional shape of the entire optical cable, it is preferable that the size of the second optical unit does not exceed three times the size of the first optical unit.

An auxiliary tensile material 60 is provided outside the optical unit layer 40 composed of the first optical unit 20 and the second optical unit 30.

As shown in FIG. 1, the auxiliary tensile material 60 is positioned outside the optical fiber unit 130 to maintain the attitude of the optical unit and to protect the optical unit from external tensile force.

Accordingly, the auxiliary tensile material 60 may be provided to surround the outside of the first optical unit 20 and the second optical unit 30 in the longitudinal direction of the optical cable. In a method of wrapping the first optical unit 20 and the second optical unit 30, for example, a method of horizontally applying a helical shape may be used.

The auxiliary tensile material 60 may be, but not limited to, aramid yarn, glass yarn or glass fiber reinforced plastic (FRP).

An outer jacket 80 may be provided outside the auxiliary tensile material 60. The outer jacket 80 is located at the outermost portion of the optical cable according to the present invention and may function as a method layer for protecting members located inside the auxiliary tensioning material 60. The outer jacket 80 may be formed of a polymer material such as polyethylene or flame retardant polyethylene.

At least one rib cord 70 may be provided between the auxiliary tensile material 60 and the outer jacket 80 for peeling off the outer jacket 80 during a connection operation.

The first optical unit 20 and the second optical unit 30 shown in Fig. 2 will be described in more detail. 2 (a) is a sectional view of the first optical unit 20 of the embodiment shown in Fig. 1, Fig. 2 (b) is a sectional view of the first optical unit 20 shown in Fig. 4, Fig. 2 (c) is a sectional view of the second optical unit 30 shown in Fig. 1, and Fig. 2 (d) shows a sectional view of the second optical unit 30 shown in Fig.

In the first optical unit 20 shown in Figs. 2A and 2B, the number of the optical fibers 21 provided in the coat layer 23 in the form of a tight buffer is different.

Here, when a plurality of optical fibers are accommodated, if the optical fiber is accommodated in a form such that a surplus accommodation space is not allowed in the coating layer 23 of the first optical unit 20, Can be defined as the first optical unit 20.

Therefore, if a plurality of optical fibers are wrapped tightly in the coating layer 23, the minute space in which the circular optical fibers are adjacent to each other may not be a space for inserting the air pollution yarn and filling the waterproof jelly. The first optical unit 20 can be regarded as a tight buffer type optical unit.

The coating layer 23 of the first optical unit may be formed of a material such as PVC, Polyvinyl chloride, Low Smoke Zero Halogen (NZS), Nylon, Thermoplastic elastomer (TPE) The buffer may be a tight buffer.

Therefore, since the first optical unit 20 can be connected to the splitter immediately when the cover layer 23 is removed, the process of removing the waterproof jelly or the like is dispensed with unlike the second optical unit 30 of the loose tube type There is an advantage that it can be. In addition, since a plurality of optical fibers can be provided in one optical unit, even when one optical unit is required to be connected to two or more splitters in one connection housing of one branch communication network, The efficiency of the process can be improved and the space for processing the hair can be minimized as compared with the case where the plurality of optical units are detached from the splice and connected to the splitter.

The number of the optical fibers 21 accommodated in the first optical unit 20 which is a tight buffer type optical unit is not limited to two as shown in Fig. 2 (b) and may be increased as necessary.

The second optical unit 30 shown in Figs. 2 (c) and 2 (d) differs in the number of the optical fibers 31 provided in the cover layer 35 of the loose tube type, Waterproofing means for preventing penetration of water can be classified into a case in which a waterproof yarn is provided and a case in which a waterproof jelly is filled.

In the case of the former case, in the case of the second optical unit 30 shown in FIG. 2 (c), there is no need to separately remove the jellies after removing the loose tube. In the latter case, (31) may be accommodated and the waterproof jelly (34) may be filled.

In the case of the second optical unit 30 shown in Fig. 2 (d), more optical fibers can be accommodated in the loose tube. Whether the roving tube 35 is filled with waterproof yarn or waterproof jelly as the waterproof means can be selected according to the installation environment of the optical cable or the demand of the user.

1 and 2, when the optical cable 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, Unnecessary waste of optical fibers can be minimized, and workability of the operator can be greatly improved.

Fig. 3 shows another embodiment of the optical cable according to the present invention. The description with reference to FIGS. 1 and 2 will be omitted.

The embodiment shown in FIG. 3 differs from the embodiment shown in FIG. 1 in that the number of the second optical units 30 provided between the first optical units 20 is two.

Therefore, when a plurality of splitters are required to be connected at the same time in the connection housing, the necessary number of second optical units 30 can be split and spliced.

Also, the number of optical fibers included in the two second optical units 30 may be different from each other as shown in FIG.

As shown in Fig. 3, in the case of the second optical unit 30 shown on the right side of Fig. 3, like the optical cable and the second optical unit shown in Figs. 1 and 2 (c), two optical fibers and a waterproof yarn The second optical unit 30 'shown on the left side of FIG. 3 is provided with four optical fibers as described with reference to FIG. 2 (d) The receiving space may be filled with waterproof jelly.

As a result, the number of the first optical units 20, which are tight buffer type optical units, and the number of the second optical units, which are loose tube type optical units, can be increased or decreased as needed in the optical cable according to the present invention. It means that the number of optical fibers accommodated in the second optical unit 30 which is an optical unit can be increased, meaning that the waterproof yarn of the second optical unit 30 shown in FIG. 1 can be replaced by waterproof jelly do.

Further, the number of waterproof yarns provided between the center line 10 and the optical unit layer 40 composed of a light unit can also be varied. The embodiment shown in FIG. 3 may be provided with only one waterproof yarn 50, unlike the embodiment shown in FIG. 1, and in some cases, the waterproof yarn may be replaced with a waterproof jelly. In this case, it may be configured to wrap the optical unit layer 40 with a separate wrapping tape (not shown) or the like.

Fig. 4 shows another embodiment of the optical cable according to the present invention. The description with reference to Figs. 1 to 3 will be omitted.

The embodiment shown in FIG. 4 differs from the embodiment shown in FIG. 1 in that some of the tight buffer type first optical units include a plurality of optical fibers other than one optical fiber. Specifically, the embodiment shown in FIG. 4 may be configured such that one of the first optical units accommodates two optical fibers, like the first optical unit shown in FIG. 2 (b).

As described above, the number of optical fibers accommodated in the first optical unit 20, which is a tight buffer type optical unit, is not limited to the two shown in Fig. 4, and may be increased further. That is, the embodiment shown in Fig. 4 shows that the tight buffer optical unit may be provided with a plurality of optical units as required.

5 shows another embodiment of the optical cable according to the present invention. The description with reference to FIGS. 1 to 4 will be omitted.

5 differs from the above embodiments in that a dummy member 90 that does not include an optical fiber in an optical unit layer 40 composed of a first optical unit 20 and a second optical unit 30, As shown in Fig.

The dummy member 90 is provided between the first optical unit 20 and the second optical unit 30 and may be interposed to fill the redundant space and to prevent waste of unnecessary optical units.

The dummy member 90 may be mounted in place of the optical unit in order to adjust the number of optical units for customer's request or other reasons and to maintain the diameter or size of the entire optical cable, , May be omitted.

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
20: first optical unit
30: second optical unit
40: optical unit layer
50: room investigation
60: auxiliary tensile material
70: lip code
80: Outer jacket

Claims (14)

1. An optical cable used in a branch communication network connected to a user via a connection enclosure including at least one splitter in an optical line terminal (OLT) of a passive optical network (PON)
center line;
A plurality of optical fibers arranged around the center line and each having a shape of a tight buffer composed of an optical fiber and a material selected from the group consisting of polyvinyl chloride, low smoke zero halogen (LSZH), nylon, and thermoplastic elastomer (TPE) A plurality of first optical units constituted of a coating layer and connected to the respective splitters in the connection housing;
And at least two optical fibers, a loose tube accommodating a plurality of the optical fibers, and a jangling waterproofing or waterproofing jelly accommodated in the interior of the loose tube are provided between the first optical units in parallel with the center line, At least one second optical unit to be simultaneously connected to at least two splitters respectively;
An auxiliary tensile material surrounding the first optical unit and the second optical unit; And
And an outer jacket surrounding the periphery of the auxiliary tensile material. delete delete delete delete The method according to claim 1,
Wherein an outer diameter of the second optical unit is equal to or greater than an outer diameter of the first optical unit. The method according to claim 1,
And at least one dummy member is included between the first optical unit and the second optical unit. The method according to claim 1,
Further comprising at least one waterproof yarn disposed between the optical unit layer composed of the first optical unit and the second optical unit and the center line and horizontally winding the center line in a spiral shape. The method according to claim 1,
Wherein the auxiliary tensile material and the outer jacket comprise a lip cord. The method according to claim 1,
Wherein the center line is any one of a glass fiber reinforced plastic (FRP), an aramid reinforced plastic (ARP), a steel wire and a stranded wire. The method according to claim 1,
Wherein the center line includes a coating layer surrounding the center bar and the center bar. 12. The method of claim 11,
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,
Wherein said auxiliary tensile material is one of aramid yarn, glass yarn or glass fiber reinforced plastic (FRP). 1. An optical cable used in a branch communication network connected to a user via a connection enclosure having at least one splitter in an optical line terminal (OLT) of a passive optical network (PON)
A center line including a center bar and a shell surrounding the center bar;
And a tight buffer surrounding the optical fiber and the optical fiber, the tight buffer being formed of a material selected from the group consisting of flame retardant polyvinyl chloride, low smoke zero halogen (LSZH), nylon, thermoplastic elastomer, TPE) material, the plurality of tight buffer optical units to be connected to the respective splitters in the connection housing; And
And a loose tube which is provided between the tight buffer optical units and parallel to the center line and accommodates at least two optical fibers and optical fibers and is filled with waterproof jelly or waterproof yarn, And at least one routed tube optical unit for receiving the optical signal.

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