KR100827178B1 - Optical network for ftth - Google Patents

Abstract

An FTTH(Fiber To The Home) optical line network is provided to improve a structure of a material(cable) necessary for constructing a line as reducing fusion connection when building the FTTH optical line network, thereby constructing the FTTH optical line network at a minimum cost. At least one 1x4 optical coupler(320) is received in an optical connection housing(300), and 4-branches each optical signal received from an office line side. At least one 1x8 optical coupler(420) is received in an optical branch housing(400), and 8-branches the optical signals branched from the 1x4 optical couplers. Drop cables are matched with the optical signals branched from the 1x8 optical couplers one to one, and transmit the optical signals branched from the 1x8 otical couplers to each subscriber terminal.

Description

ＴＴＨ fiber optic network {Optical network for FTTH}

1 is a schematic diagram showing the structure of a typical FTTH optical fiber network.

FIG. 2 is a diagram illustrating in more detail a wiring relationship from an optical junction box to a subscriber's premises in the optical fiber network of FIG.

3 is a cross-sectional view showing the structure of a conventional three-light optical cable in FIG.

4 is a configuration diagram showing the structure of a conventional optical splitter box in FIG.

5 is a cross-sectional view showing the structure of a conventional photo-outer ray in FIG.

6 is a view showing an embodiment of a conventional optical junction box in FIG.

7 is a block diagram showing in more detail the wiring relationship from the optical junction box to the subscriber premises in the FTTH optical fiber network according to the present invention.

FIG. 8 is a cross-sectional view illustrating a structure of a narrow-light optical cable connecting the optical junction box and the integrated optical splitter box in FIG. 7; FIG.

FIG. 9 is a diagram illustrating the structure of the integrated optical splitter box in FIG. 7 in more detail. FIG.

FIG. 10 is a cross-sectional view illustrating a structure of photo-outer ultraviolet rays in FIG. 7. FIG.

<Description of Symbols for Main Parts of Drawings>

300: optical junction box 320: 1 × 4 optical splitter

400: integrated optical splitter box 420: 1 × 8 optical splitter

500: thin-light optical cable 510, 610: aramid yarn

520, 620: outer skin 600: ore

The present invention relates to the construction of an optical fiber network for FTTH (Fiber To The Home) using a passive optical network (PON). More particularly, the present invention relates to a structure capable of reducing a welding connection in constructing an FTTH optical fiber network. The present invention relates to a FTTH optical fiber network construction technology that enables the construction of an FTTH optical fiber network at cost.

In today's information society, the role of communication network is very important. Especially, as network communication such as the Internet is developed and a large amount of data is transmitted such as video or voice, an increase in information throughput and processing speed is required. The expansion of the network is urgently needed.

In order to satisfy such demands, the use of optical cables instead of coaxial cables is rapidly increasing as a way to process large amounts of information at high speed. In particular, the FTTH network construction that installs optical cables to each home in order to provide high-quality, high-speed services has recently been carried out on a government-wide level.

1 is a network diagram schematically showing the structure of a typical FTTH optical fiber network.

In the FTTH optical fiber network, the optical cable is connected from the telephone company (CO) 10 to the subscriber's premises 20, unlike the conventional optical cable, which has been made up to each management building (MDF).

In this FTTH optical fiber network, an underground optical junction box 30 is installed in an underground manhole, which is the intermediate point of the optical path, and a signal of one optical fiber core wire, that is, each optical signal from the telephone station 10, is installed inside the optical junction box 30. 1 x 32 optical couplers are provided which branch the circuit into a plurality of optical fiber cores. The optical fiber cores branched from the optical splitter are connected to the subscriber premises 20 through the optical splitter 40 installed on the pole or the wall. At this time, the optical junction box 30 and the optical branch box 40 is connected by a narrow optical cable 50, and from the optical branch box 40 to each subscriber's premises 20 are connected by a drop cable 60. .

FIG. 2 is a diagram illustrating in more detail the wiring relationship from the optical connection enclosure 30 to the subscriber premises 20 in the optical fiber network of FIG.

In the optical connection enclosure 30, a plurality of 1x32 optical splitters 32 for distributing and combining optical signals from one optical fiber core into up to 32 optical signals are accommodated (one optical splitter for convenience of description in FIG. 2). Bay), and the optical fiber cores branched from the optical splitter 32 are connected to the optical splitter 40 through the narrow-light optical cable 50 having the structure as shown in FIG. 3. At this time, 8 to 32 optical fiber cores are introduced into the optical branch box 40, and each optical fiber core is connected in a one-to-one manner within the optical outdoor box 60 and the optical branch box 40 of each subscriber. . In addition, the optical outlet 22 for terminating the optical fiber core in the optical branch box 40 and the subscriber premises 20 is connected to the optical outdoor 60 having the structure as shown in FIG. 5, and the optical outlet at the subscriber premises 20. The 22 and the ONT (Optical Network Terminal) 24 are connected by an optical jumper cord (OJC). In this case, the photo-outdoor 60 has a structure in which the external support line 62 made of a metal component supports the optical cable 64 as shown in FIG. 5.

However, the above-described conventional FTTH optical fiber network connection structure requires a lot of fusion splicing between the optical junction box 30 and the optical outlet 22. That is, in order to connect the optical splitter 32 and the optical splitter 40 to the optical fiber core wires, each 1 × 32 optical splitter 32 has a total of 64 fusion splicings, that is, 32 times at the output terminal of the optical splitter 32 and the optical splitter box. At the input of (40), 32 fusion splicing is required again. In addition, two fusion splicing connections are required for each subscriber even between the optical branch box 40 and the optical outlet 22. In addition, the optical connector connection (a, b) in the optical branch box 40 and the optical outlet 22 and the connection using the optical jumper cord (OJC) between the optical outlet 22 and the ONT 24 are required. .

This welding work was very difficult and cumbersome, and excessive labor and work time were required, resulting in a costly problem.

The costs incurred in constructing the FTTH optical fiber network can be largely divided into the equipment cost and the track cost, and the line cost can be divided into material cost and construction cost (labor cost). At this time, the line construction cost, construction and opening costs account for about 65% of the total fiber construction, and labor costs account for about 75% of the total construction cost. Therefore, in order to construct an economical FTTH optical fiber network, construction cost, which mainly consists of labor costs, should be reduced. For this purpose, it is desirable to minimize labor and work time when constructing an FTTH optical fiber network.

In addition, in order to reduce the cost of the FTTH optical fiber network, it is desirable to utilize existing installations, that is, existing underground pipelines and processing facilities. However, in the conventional FTTH construction method, since 8 to 32 optical cables are led from the optical junction box 30 to the optical junction box 40 as described above, the optical junction box 30 and the optical branch box 40 are separated from each other. In order to connect the conventional conventional thick three-light cable 50 having a large diameter of about 8 mm as shown in Figure 3 was to be used. Therefore, when the free space is not left due to other cables already installed in the existing pipeline has a problem that can not be installed by using a thick three-light cable 5 as shown in FIG. Even if there is room in the existing pipeline, the installation of the three-light cable (50) has a problem that it is difficult to install other cables in the pipeline because the space is significantly reduced. Since a large number of optical cables are accommodated in the narrow optical cable 50, the FRP support line is used at the center of the narrow optical cable 50 to support this. .

In addition, conventionally, by using the 1 × 32 optical splitter 32 to branch the optical signal from the telephone company 10 into the optical branch box 40, the core wires to be stored more and more, the thin narrow optical cable 50 as described above Since the optical connection enclosure 30 is larger in size as shown in FIG. 6, it cannot accommodate a small optical cable. As the size of the optical connection enclosure 30 becomes larger, it occupies a lot of space in the cramped manhole, which may act as an obstacle to the activation of the FTTH, which is expected to be added later.

In the case of the photo-outer rays 60, since the external support line 62 made of a metal component for supporting the optical cable 64 is required separately from the optical cable 64, the overall thickness thereof becomes thicker and such a rigid support line 62 is used. Due to the lack of installation flexibility, in order to attract the photo-outer 60 to the subscriber premises 20, a large hole is required to be drilled separately.

Accordingly, an object of the present invention to solve the above problems is to improve the structure of the FTTH optical fiber network and its construction method so that the FTTH optical fiber network can be constructed with minimal cost.

The FTTH optical fiber network of the present invention for achieving the above object is at least one 1 × 4 optical splitter that is accommodated in the optical connection enclosure and quarterly divides each optical signal from the country side; At least one 1 × 8 optical splitter accommodated in an optical splitter for eight-branching the optical signal branched from the 1 × 4 optical splitter; And one-to-one correspondence with each optical signal branched from the 1 × 8 optical splitter to transmit the optical signal branched from the 1 × 8 splitter to each subscriber-side terminal.

The FTTH optical fiber network of the present invention includes an optical connection enclosure for receiving at least one 1 × 4 optical splitter and for splitting an optical signal from a telephone company; An integrated optical splitter box for receiving at least one 1 × 8 optical splitter and for splitting an optical signal from the optical junction box; And an out-of-air beam that corresponds one-to-one with each optical signal from the optical splitter and transmits each optical signal from the optical splitter to each subscriber-side terminal.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

7 is a block diagram showing in more detail the wiring relationship from the optical junction box to the subscriber premises in the configuration of the FTTH optical fiber network according to the present invention.

Comparing the configuration of the present invention with FIG. 2, the present invention does not use a 1 × 32 optical splitter 32 to accommodate 32 subscribers, but instead uses a 1 × 4 optical splitter 320 and a 1 × 8 optical splitter 420. Use a structure that connects) step by step. That is, in the present invention, each optical cable branched from the station side 10 to the 1 × 4 optical splitter 320 and branched from the 1 × 4 optical splitter 320 is one-to-one with the 1 × 8 optical splitter 420. To be connected. At this time, in the present invention, the 1 × 4 optical splitter 320 is accommodated in the optical connection enclosure 300 and the 1 × 8 optical splitter 420 is accommodated in the integrated optical splitter 400. That is, in the conventional FTTH optical fiber network as shown in FIG. 2, the 1x32 optical splitter is accommodated in the optical connection enclosure. However, in the present invention, only the 1x4 optical splitter 320 is accommodated and the branch is separated from the 1x4 optical splitter 320 instead. The number of optical fibers connected between the optical junction box 300 and the optical splitter 400 is reduced by accommodating the 1 × 8 optical splitter 420 in the optical splitter 400 to branch back the received optical signal. To this end, in the present invention, the optical splitter 400 is configured as an integrated optical splitter 400 in which a 1 × 8 optical splitter 420 is accommodated.

Therefore, in the present invention, each optical signal from the side of the national history 10 is four-branched in the 1 × 4 optical splitter 320 accommodated in the optical connection enclosure 300 and the signal divided in four by the 1 × 4 optical splitter 320 In each case, the light is divided into eight quarters by the 1 × 8 optical splitter 420 accommodated in the integrated optical splitter 400.

Up to four 1 × 8 optical splitters 420 are housed in the integrated optical splitter 400 to accommodate up to 32 subscribers, and the fiber optic cores branched from the 1 × 8 optical splitters 420 are each outdoors The line 600 is connected in a one-to-one manner. Accordingly, up to four optical cables may be inserted into each integrated optical splitter 400 from the optical connection enclosure 300 according to the number of subscribers accommodated in the integrated optical splitter 400.

As such, by receiving the 1 × 4 optical splitter 320 in the optical junction box 300 and the 1 × 8 optical splitter 420 in the integrated optical splitter 400, the optical junction box 300 and the integrated optical splitter ( 400), a total of eight fusion spliced connections for each 1 × 4 optical splitter 320, that is, 4 times at the output terminal of the 1 × 4 optical splitter 320 accommodated in the optical junction box 300, and a corresponding 1 × 8 optical splitter. Only four fusion splices are required at the input of 420.

Further, in the present invention, in order to eliminate the fusion splicing even in the connection between the lead wires of the integrated optical branch box 400 and the photo-outer ray 600, the ends of the optical fiber cores drawn from the integrated optical branch box 400 and the photo-outer ray 600 End of the integrated optical splitter box 400 is configured in the form of a field assembly connector is connected. As such, by connecting the integrated optical branch box 400 and the photo-outer beam 600 through the field assembly type connector, the integrated optical branch box 400 and the ONT 24 are not directly connected to each other via the optical outlet 22 as shown in FIG. 2. It can be connected and thus does not require a separate fusion connection.

FIG. 8 is a cross-sectional view illustrating a structure of a narrow-light optical cable 500 connecting the optical junction box 300 and the integrated optical branch box 400 in FIG. 7.

As described above, in the structure as shown in FIG. 2, the maximum number of optical cables that enters the optical junction box 40 from the optical junction box 30 is 32, so that the optical junction box 30 and the optical branch box 40 may be satisfied. In Figure 3 it was essential to use a thick narrow optical cable 50 that can accommodate a large number of optical cables.

However, in the present invention, as shown in FIG. 7, only the 1 × 4 optical splitter 320 is accommodated in the optical junction box 300, and the maximum 4 x 1 × 8 optical splitters 420 are accommodated in the integrated optical splitter 400. The number of optical cables introduced from the junction box 300 into the integrated optical splitter box 400 is reduced to a maximum of four. Therefore, in the present invention, the optical cable enclosure 300 and the integrated optical branch box 400 do not use the thick optical cable 50 as shown in FIG. 3 without the narrow optical cable 500 that accommodates only four optical cables as shown in FIG. It becomes usable.

At this time, in the present invention, by using the aramid yarn (aramid yarn) (510) inside the three-light optical cable 500 to reinforce the side of the optical fiber and use it as a tensile line to improve the flexibility. In addition, the outer shell portion 520 of the thin-light optical cable 500 is made of flame-retardant polyurethane material so that it can be flexibly installed even in the bent portion of the pipe. In addition, the optical fiber was used as a low bending loss optical fiber so that the optical characteristics are maintained even in the bending portion of the pipe. By using the new thin-fiber light cable 500 as described above, the cable is thin and light, so it is easy to install. Accordingly, the cable can be installed with minimal manpower and it is easy to use the existing pipeline.

In addition, in the present invention, in order to facilitate the connection between the optical connection enclosure 300 and the narrow optical cable 500, the optical fiber and the narrow optical cable 500 branched from the 1 × 4 optical splitter 320 accommodated in the optical connection enclosure 300. The four optical fibers of) may have four different colors having corresponding colors.

9 is a block diagram illustrating the structure of the integrated optical splitter box 400 in FIG. 7 in more detail.

The integrated light splitter 400 of the present invention accommodates up to four 1 × 8 light splitters 420 therein as shown in FIG. 9 to accommodate up to 32 subscribers, as in the conventional light splitter 40. That is, since the optical fibers branched from the optical junction box 300 and introduced into the integrated optical splitter box 400 are connected to the 1 × 8 optical splitter 420 in the integrated optical splitter 400 in a one-to-one manner, the integrated optical splitter 400 ) Up to 4 optical fibers are introduced.

Therefore, the optical connection enclosure 300 and the integrated optical splitter 400 may be connected with only one thin light cable 500 of one line having four optical fibers as shown in FIG. 8. In addition, in the conventional optical branch box 40 as shown in FIG. 4, up to 32 fusion splices are required at the inlet end, but in the integrated optical branch box 400 according to the present invention, up to four at the inlet end depending on the number of subscribers accommodated. Only need fusion splicing.

FIG. 10 is a cross-sectional view illustrating a structure of the photo-outer ray 600 in FIG. 7.

Ore infrared light is used for a short distance from the light branch box to the home, and it should be able to be quickly installed without special tools in the actual field. However, the conventional photo-outer ray 60 as shown in FIG. 5 has an outer support line 62 made of a metal component, which is heavy and difficult to bend, thus inferior in flexibility in installation.

Therefore, the photo-outdoor 600 of the present invention reinforces the optical fiber side by removing the support line and using the aramid yarn 610 inside the photo-outdoor 600 instead and improving flexibility by using it as a tensile line. In addition, the outer skin portion 620 of the ore rays 60 is made of a flame-retardant polyurethane material so that it can be flexibly bent at the bent portion of the pipeline. In addition, the optical fiber was used as a low bending loss optical fiber so that the optical characteristics are maintained even in the bending portion of the pipe.

The embodiments described above are merely one embodiment of the invention and various modifications are possible.

For example, in the above-described embodiment, the 1 × 4 optical splitter 320 is accommodated in the optical connection enclosure 300 while separating the 1 × 32 optical splitter into the 1 × 4 optical splitter 320 and the 1 × 8 optical splitter 420. The 1 × 8 light splitter 420 was housed in the integrated light splitter 400. However, although the fusion splicing increases and the thickness of the three-light optical cable becomes thicker than in the above-described embodiment, it is obvious that the positions where the 1x4 optical splitter 320 and the 1x8 optical splitter 420 are accommodated can be interchanged. .

As described above, the FTTH optical fiber network of the present invention makes it possible to construct the FTTH optical fiber network at the minimum cost by reducing the fusion connection in the construction of the track and improving the structure of materials (cables, etc.) required for the construction of the track.

Claims (18)

At least one 1 × 4 optical splitter accommodated in the optical splice enclosure for quarterly dividing each optical signal from the bureau side; At least one 1 × 8 optical splitter accommodated in an optical splitter for eight-branching the optical signal branched from the 1 × 4 optical splitter; And And one or more one-to-one correspondences with the optical signals branched from the 1 × 8 optical splitter, and transmit the optical signals branched from the 1 × 8 optical splitter to each subscriber terminal. The ore is An FTTH optical fiber network having both ends connected to the optical branch box and the subscriber terminal and an on-site assembly type optical connector, respectively. The optical splitter box of claim 1, wherein And a maximum of four 1 × 8 optical splitters one-to-one corresponding to the optical fiber branched from the 1 × 4 optical splitter. The optical junction box and the optical branch box of claim 2 The FTTH optical fiber network, characterized in that connected by the three-light optical cable containing four optical fibers that are connected one-to-one with the four 1 × 8 optical splitters. 4. The optical fiber of claim 3, wherein the four optical fibers of the narrow optical cable are An FTTH optical fiber network having the same color as that of the optical fibers branched from the 1 × 4 optical splitter. According to claim 3, wherein the narrow light cable is Outer skin; Aramid yarn filled inside the outer skin; And And said four optical fibers penetrating said aramid yarn. The method of claim 5, wherein the outer skin portion FTTH optical fiber network, characterized in that made of flame-retardant polyurethane material. delete The method of claim 1, wherein the photo-outer Outer skin; Aramid yarn filled inside the outer skin; And An FTTH optical fiber network comprising one optical fiber passing through the aramid yarn. The method of claim 8, wherein the outer skin portion FTTH optical fiber network, characterized in that made of flame-retardant polyurethane material. An optical junction box for accommodating at least one 1 × 4 optical splitter and for branching an optical signal from a telephone company; An integrated optical splitter box for receiving at least one 1 × 8 optical splitter and for splitting an optical signal from the optical junction box; And And FTTH optical fiber network that has one-to-one correspondence with each optical signal from the optical splitter and transmits each optical signal from the optical splitter to each subscriber-side terminal. The method of claim 10, wherein the integrated light splitter box An FTTH optical fiber network for accommodating up to four said 1 × 8 optical splitters. The method of claim 11, wherein the optical junction box and the integrated optical splitter box The FTTH optical fiber network, characterized in that connected by the three-light optical cable containing four optical fibers that are connected one-to-one with the four 1 × 8 optical splitters. The thin cable of claim 12, wherein Outer skin; Aramid yarn filled inside the outer skin; And And said four optical fibers penetrating said aramid yarn. The method of claim 13, wherein the outer skin portion FTTH optical fiber network, characterized in that made of flame-retardant polyurethane material. The optical fiber of claim 12, wherein the four optical fibers of the narrow optical cable are An FTTH optical fiber network having the same color as that of the optical fibers branched from the 1 × 4 optical splitter. 11. The method of claim 10, wherein the photons are FTTH optical fiber network, each end of which is connected to the integrated optical splitter box and the subscriber terminal and the field assembly type optical connector. 17. The method of claim 16, wherein the photon outside is Outer skin; Aramid yarn filled inside the outer skin; And An FTTH optical fiber network comprising one optical fiber passing through the aramid yarn. 18. The method of claim 17, wherein the skin portion FTTH optical fiber network, characterized in that made of flame-retardant polyurethane material.

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