JP2706238B2 - Optical cable line between telephone office and subscriber - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] The present invention relates to an optical cable line connecting a telephone station to individual subscribers (general homes, business offices, etc.), and is particularly constituted by an optical cable using a tape core. It relates to an optical cable line. [Prior art and its problems] In an optical cable line connecting a telephone office and a subscriber, an optical cable coming out of the telephone office is assumed to include a large number of optical fiber cores, and an optical cable having a small number of cores is sequentially branched therefrom. So-called star-type wiring, in which one to several optical fiber cores are distributed to individual subscribers, is effective. In order to construct such an optical cable line, the number of connection points of the optical fiber becomes extremely large, and it is necessary to efficiently perform the connection work. Conventionally, as an optical cable that allows efficient connection work,
An optical cable of a tape core type has been developed. This optical cable is a cable in which several optical fiber elements are arranged in a plane and collectively covered, and a required number of tape cores are housed in a sheath, and multiple cores can be connected collectively in units of tape cores. Therefore, the connection workability is extremely excellent.
In addition, there are advantages that the density of the optical fiber can be increased and the cost per core is low. For this reason, the optical fiber cable of the tape core type is conventionally used for a feeder cable having a large number of cores. However, it is difficult to separate the individual optical fiber strands because the tape core strand is coated at a time, and it is not possible to branch from any optical fiber strand within the tape core to the subscriber. Therefore, it is considered unsuitable for a subscriber-type distribution cable. For this reason, a single-core type optical cable containing a required number of single-core optical fibers is considered to be used for the subscriber-system distribution cable, but this type of optical cable has one optical fiber core. Since one connection is required, there is a disadvantage that the connection operation takes a lot of time. [Means for Solving the Problems and Their Functions] The present invention has been made in view of the problems of the prior art described above, and the optical cable line between the telephone station and the subscriber is constituted by an optical cable of a tape core type, so that the connection work can be further improved. The goal is to be able to do it efficiently. In order to achieve this object, the present invention provides an optical cable line between a telephone station and a subscriber as follows.
That is, an optical cable containing a required number of tape cores including n (an integer of 2 or more) optical fibers is a one-stage cable,
An optical cable containing a required number of tape cores including m (integer of 2 or more) × n optical fibers is a two-stage cable, and l (integer of 2 or more) × m × n optical fibers If an optical cable containing a required number of core fibers including element wires is a three-stage cable, and similarly a four-stage cable, a five-stage cable, and so on, the optical cable coming out of the central office is a two-stage or more cable. From the cable side to the subscriber side so that the optical cable to which the subscriber is connected becomes a single-stage cable, and at least the lower-level cable of two or more cables is connected. The separated cables are separated into units that contain the same number of optical fibers as the number of optical fibers used in the cables below. (Even if there are two or more cables, the cables to which the cables at the lower level are not connected may not have each tape core separated into units.) The cables used shall be such that each of the ribbons can be separated into one or more optical fiber strands. At the connection part of the same-stage cables, the tape cores are connected together, and two or more-stage cables and the lower-stage cables are connected. In the connecting part, the end of the tape core of the former cable is separated into each unit and connected to the tape core of the latter cable. A. In other words, the closer the cable to the central office, the greater the number of cores, so in the present invention, the closer the cable to the central office, the greater the number of cores that can be connected collectively by using a larger number of cores. I try to reduce. In this case, it is necessary to connect a tape core having a large number of cores (high-stage cable) to a tape core having a small number of cores (a low-stage cable). The unit can be separated into units having the same number of cores as the number of cores, thereby facilitating connection with the number of cores having a small number of cores. The optical fiber cable to which the subscriber is connected also uses a tape core. The tape core can be separated into one or a plurality of optical fiber strands to facilitate the connection of the subscriber. . Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention. This optical cable line is a two-stage cable 13A from the telephone office 11 to the subscriber 12.
-It is configured using 13B and one-stage cables 14A and 14B. The two-stage cables 13A and 13b use eight-core ribbon wires as shown in FIGS. 2 and 3, and the one-stage cables 14A and 14B use four-core tape wires as shown in FIGS. 4 and 5. Uses cords. That is, the one-stage cables 14A and 14B in this embodiment are optical cables using n = 4 tapes, and the two-stage cables 13A and 13B are m = 2.
This is an optical cable using a core of n = 4. As shown in FIG. 2, the optical cable 13A coming out of the telephone office 11 is a cable in which a required number of optical fibers 15 are coated with a common coating 16 and formed into a tape, and a tape core 17 is housed in a required number of sheaths 18. is there. The tape core 17 has a structure that cannot be separated into units. As shown in FIG. 3, the next optical cable 13B is a cable in which a required number of optical fibers 15 with a common coating 19 applied thereto are housed in a required number of sheaths 18. 20 is 2 units for 4 cores
A vertical groove 21 is formed in the center of the covering 19 so as to be divided. At a connecting portion 22A between the two-stage cables 13A and a connecting portion 22B between the two-stage cables 13A and 13B, the eight-core ribbons are connected together. Next, as shown in FIG. 4, a one-stage cable 14A connected to the last two-stage cable 13B is provided with a tape core 24 having a common coating 23 applied to four optical fiber strands 15 in a required number of sheaths 18 as shown in FIG. It is stored in. The tape core 24 has a structure that is not separated into individual optical fiber strands 15.
At the connection portion 25 between the two-stage cable 13B and the one-stage cable 14A, the connection of the above-described eight-core tape core 20 and four-core tape core 24 is required. As shown in FIG. This is accomplished by separating the ends of the eight-core tape 20 into four-core units 20a and 20b, each of which is connected to a four-core tape 24. In other words, the processing can be performed in the same manner as the connection of the normal four-core tape. Next, as shown in FIG. 5 (a), the required number of optical fibers 14B to which the subscriber 12 is connected is housed in the required number of sheaths 18 in the number of core wires 27 obtained by applying a common coating 26 to the four optical fiber wires 15. However, the tape core 27 has, for example, a structure as shown in (b) or (c) of FIG. That is, the tape core 27 of (b) is formed by applying a soft coating (Young's modulus is 5 kg / mm ² or less) 26 a on the four optical fiber wires 15 and then a thin hard coating (Young's modulus is 20 kg / mm ² or more) 26 ^b The individual optical fiber 15 can be taken out by breaking the hard coating 26b. In addition, (c) tape core wire 27
Is formed by forming a longitudinal groove 28 in the coating 26, and the individual optical fiber 15 can be taken out by tearing the coating 26. Since the optical cable 14B has the above-described structure, the subscriber 12 can be easily connected by selecting a required tape core and separating the required optical fiber from the core. In the connecting portion 29A between the single-stage cables 14A and the connecting portion 29B between the single-stage cables 14A and 14B and the connecting portion 29C between the single-stage cables 14B, the four-core ribbons are collectively connected. FIG. 7 shows another embodiment of the present invention. This optical cable line runs from the central office 11 to the subscriber 12 using a three-stage cable 30.
A ・ 30B, 2 stage cable 13A ・ 13B, 1 stage cable
It is configured using 14A and 14B. 3-stage cable
As shown in FIGS. 8 and 9, 30A and 30b use 16-fiber ribbons, and two-stage cables 13A and 13B and 1
The step cables 14A and 14B are the same as those in the above-described embodiment, and use eight-core tape and four-core tape, respectively. That is, the one-stage cables 14A and 14B in this embodiment have n =
4, two-stage cables 13A and 13B are optical cables using m = 2 and n = 4 tape cores, and three-stage cables 30A and 30B are l = 2 and m
= 2, n = 4. As shown in FIG. 8, the optical cable 30A coming out of the telephone office 11 is a cable in which a required number of core wires 32 in which 16 common optical fibers 15 are provided with a common coating 31 are accommodated in a required number of sheaths 18.
The tape core 32 has a structure that cannot be separated into units. The next optical cable 30B is 16
Core fiber with a common coating 33 applied to a single optical fiber 15
A required number of sheaths 34 are housed in the sheath 18. The tape core 34 has a longitudinal groove 35 formed in the center of the coating 33 so that the core 34 can be divided into two units each having eight cores. At the connection portion 36 between the three-stage cables 30A and 30B, the 16-core tape cores are connected together. In the connection portion 37 between the three-stage cable 30B and the two-stage cable 13A, the 16-core tape core 34 and the 8-core tape core 17 are used.
Connection is required, but the connection is
Is divided into units of 8 cores, and these are divided into 8 units each.
This is performed by connecting with the core tape 17. In other words, processing can be performed in the same manner as the connection of a normal 8-core tape. The following optical cables and their connection states are the same as those in the above-described embodiment, and therefore, the same portions are denoted by the same reference numerals and description thereof will be omitted. In each of the above embodiments, two types of cables were used as the two-stage cable or the three-stage cable, one using a tape core that cannot be separated into units and the other using a tape core that can be separated into units. All cables can be unified to those using tape cores that can be separated into units. Similarly, all the single-stage cables can be unified to use a separable tape for each optical fiber. Further, in each of the above embodiments, the tape core of the one-stage cable can be separated for each optical fiber.
The separation unit is not limited to this, and may be a unit that can be separated into a plurality of, for example, two optical fiber wires according to the situation of the subscriber. [Effects of the Invention] As described above, according to the present invention, from the cable coming out of the telephone office to the cable to which the subscriber is connected, all the optical cables using the tape core, the cable closer to the telephone office, In other words, since a cable having a larger number of cores uses a tape core having a larger number of cores, the number of cores that can be connected collectively is increased, and the cores can be connected more efficiently.
In addition, if this is done, a tape core with a large number of cores (high-level cable) and a tape core with a small number of cores (low-level cable)
Although it is necessary to connect with a tape core with a small number of cores, a tape core with a large number of cores connected to a tape with a small number of cores can be separated into a unit with the same number of cores as a tape core with a small number of cores. The connection with a tape core having a small number of cores can be easily performed. The optical fiber cable to which the subscriber is connected also uses a tape core, but the tape core can be separated into one or more optical fiber strands. Can be easily performed.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory diagram of an optical cable line according to an embodiment of the present invention, FIGS. 2 and 3 are explanatory diagrams of a two-stage cable used in the optical cable line, respectively. Figure and Fifth
5A is an explanatory view of a one-stage cable used for the optical cable line, and FIGS. 5B and 5C are cross-sectional views of a tape core used for the cable of FIG.
FIG. 6 is a plan view showing a connection portion between a tape core of a two-stage cable and a tape core of a one-stage cable in the optical cable line, and FIG. 7 is an explanatory diagram of an optical cable line according to another embodiment of the present invention. 8 and 9 are explanatory views of a three-stage cable used for the same optical cable line. 11-telephone office, 12-subscriber, 13A / 13B-two-stage cable,
14A ・ 14B〜1 stage cable, 15〜optical fiber, 16〜
Common covering, 17 to tape core, 18 to sheath, 19 to common covering, 20 to tape core, 20a / 20b to unit, 21 to longitudinal groove,
26 ~ Common coating, 27 ~ Tape wire, 28 ~ Vertical groove, 30A ・ 30B ~
3-stage cable, 31 ~ Common coating, 32 ~ Tape, 33 ~
Common covering, 34 to tape core, 35 to flute.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location H04B 10/14 (72) Inventor Hideyo Hiramatsu 6th Yawata Kaigandori, Ichihara-shi Furukawa Electric Co., Ltd. Inside the factory (72) Inventor Hirotoshi Motomichi 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Inside Furukawa Electric Co., Ltd. (72) Inventor Koji Sakuta 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Inventor Yutaka Katsuyama 162 Shirane, Shirokata, Tokai-mura, Naka-gun, Ibaraki Pref. Nippon Telegraph and Telephone Corporation Ibaraki Electric Communication Research Laboratories

Claims (1)

(57) [Claims] An optical cable containing a required number of optical fibers including n (an integer of 2 or more) optical fibers is a one-stage cable, and a tape core including an optical fiber including m (an integer of 2 or more) × n optical fibers. An optical cable containing a required number of wires is a two-stage cable, an optical cable containing a required number of tape cores including l (an integer of 2 or more) × m × n optical fiber strands is a three-stage cable, and so on. 4-stage cable, 5
When the stage cable is used, the optical cable coming out of the central office is a cable of two or more stages, and the cable stages are sequentially lowered as going from the central office to the subscriber side. The cable to which at least the lower-stage cable of the two or more stages is connected is such that each tape core is an optical fiber element of the tape core used for the lower-stage cable. At least one of the single-stage cables to which the subscriber is connected has one or more optical fiber strands. Separable for each wire. At the connection part of the cables at the same stage, the respective tape cores are connected together, and two or more stages of cables and At the connection with the cable at the stage, the end of the tape core of the former cable is separated into each unit and connected to the tape core of the optical cable. The optical cable line between the central office and the subscriber.