JP2000075149A - Ribbon type optical fiber and ribbon type optical fiber cord - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to easily suppress skew in spite of many optical fibers by arraying a plurality of ribbon type optical fiber units 1, which are formed by bundling plural optical fibers by coatings and integrating these fibers to a ribbon form, in a direction where these optical fibers are arrayed, coating these fiber units and integrating the fiber units to a ribbon form. SOLUTION: The optical fibers 11, which are arrayed in a plurality (for example, 4 pieces) to a rectilinear shape and all of which are formed from the same preform, are integrated to the ribbon form by the first coatings 12, by which the ribbon type optical fiber units 13 are constituted. These ribbon type optical fiber units 13 are arrayed in a plurality (for example, 3 pieces) in the direction where the optical fibers 11 are arrayed and are integrated to a ribbon form by the second coatings 14, by which the ribbon type optical fiber 10 is constituted. Then, the differences in the entry angles to dies in a ribbon forming stage may be easily suppressed and the back tension applied on the respective optical fibers 11 is controlled. The easy suppression of the variation in the lengths of the respective optical fibers 11 is thus made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape type optical fiber and a tape type optical fiber cord used as a transmission medium of a parallel optical transmission system in a communication system device or the like.

[0002]

2. Description of the Related Art An optical fiber having a smaller diameter than a metal cable and having EMC compatibility is effective for a large-capacity wiring system such as data transmission in a communication system device or between devices. By applying tape type optical fiber,
Multi-channel parallel transmission can be performed, and higher density, higher throughput, and lower cost of the wiring system can be achieved.

In parallel transmission using such a tape-type optical fiber, variation in transmission delay between channels, that is, skew becomes a problem. Skew is caused by variation in the refractive index and length of each optical fiber constituting the tape-type optical fiber, and is usually [ps /
m] as a unit, it increases with the line length, causing a trade-off between the transmission speed and the transmission distance, and limits the performance of communication devices and the like.

For this reason, when manufacturing a tape-type optical fiber, as shown in FIG. 4, a plurality (12 in this example) of optical fiber wires 111, all of which are manufactured from the same base material, are arranged in the radial direction. Variations in the refractive index of each optical fiber are suppressed by linearly arranging the coating 112 to form an integrated tape.

On the other hand, in order to suppress variations in the length of each optical fiber 111, the back tension applied to each optical fiber 111 in the tape forming process is controlled. When a sheath is applied to the tape-shaped optical fiber 110 thus manufactured with a tensile strength member, a tape-shaped optical fiber cord with reduced skew can be obtained.

[0006]

However, the tape type optical fiber 110 having a large number of the optical fiber wires 111 has a disadvantage.
In the case of manufacturing, since the difference in the insertion angle of each optical fiber 111 into the dice in the tape forming process becomes large,
It is difficult to control the back tension of each optical fiber 111, and it is difficult to suppress the variation in the length of each optical fiber 111.

In view of the above, an object of the present invention is to provide a tape-type optical fiber and a tape-type optical fiber cord which can easily suppress the skew even if the number of optical fiber wires is large.

[0008]

A tape-type optical fiber according to the present invention for solving the above-mentioned problems comprises a tape-type optical fiber unit in which a plurality of optical fiber wires are bundled by coating and integrated into a tape shape. It is characterized in that a plurality of fibers are arranged in the arrangement direction and are integrated into a tape shape by coating.

[0009] In the above-mentioned tape type optical fiber, the optical fiber strands are all manufactured from the same base material.

[0010] The tape-type optical fiber cord according to the present invention is characterized in that the above-mentioned tape-type optical fiber is provided with a tensile strength member and a sheath.

The above-mentioned tape-type optical fiber cord is characterized in that the optical fiber strands are all made of the same base material.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a tape-type optical fiber and a tape-type optical fiber cord according to the present invention are shown in FIGS.
2 will be described. FIG. 1 is a sectional view showing a schematic structure of the tape-type optical fiber, and FIG. 2 is a sectional view showing a schematic structure of the tape-type optical fiber cord.

As shown in FIG. 1, a plurality of (four in the present embodiment) optical fiber strands 11 which are all manufactured from the same base material are arranged in a straight line in the radial direction. The tape type optical fiber unit 13 is constituted by being integrated with the optical fiber unit. A plurality (three in this embodiment) of these tape-type optical fiber units 13 are arranged in the direction in which the optical fiber strands 11 are arranged, and are integrated into a tape shape by the second coating 14, so that a tape-type optical fiber unit 13 is formed. 1
0.

As shown in FIG. 2, a strength member 21 is provided on the outer surface of the tape-shaped optical fiber 10. A sheath 22 is provided on the outer surface of the strength member 21 in close contact therewith. Thus, the tape-type optical fiber cord 20 is configured.

In such a tape-type optical fiber 10 and a tape-type optical fiber cord 20, a tape-type optical fiber unit 13 is first manufactured using a relatively small number of optical fiber strands 11, so that the description will be made first. Compared with the conventional tape-type optical fiber 110, it is easier to suppress the difference in the angle of entry into the dice in the tape forming process,
By controlling the back tension applied to each optical fiber 11, variation in the length of each optical fiber 11 can be easily suppressed.

Therefore, according to such a tape type optical fiber 10 and a tape type optical fiber cord 20,
Skew can be easily suppressed even if the number of optical fiber wires 11 is large.

Here, the skew between each optical fiber strand 11 of the tape-type optical fiber 10 according to the present invention and each optical fiber strand 111 of the conventional tape-type optical fiber 110 was examined. As shown in FIG. 3B, the skew difference was about 2.8 ps / m, whereas in the present invention, the skew difference was about 1.2 ps / m, as shown in FIG.
ps / m, and it was confirmed that the skew difference could be suppressed to half or less than that of the conventional product.

In this embodiment, the number of optical fiber strands 11 is 12, the number of tape-type optical fiber units 13 is 3, and the number of tape-type optical fiber units 1 is three.
Although the number of the optical fiber wires 11 in 3 is four, these numbers are not particularly limited.

In the present embodiment, a plurality of optical fiber wires 11 are integrated with a coating 12 to form a tape-type optical fiber unit 13. The tape-type optical fiber 10 is configured by integrating the optical fiber unit. For example, a plurality of optical fiber strands integrated with the coating are further arranged and integrated with the coating to configure the tape-type optical fiber unit. By arranging a plurality of the tape-type optical fiber units and integrating them with a coating, a tape-type optical fiber can be formed. In other words, a plurality of tape-type optical fiber units in which a plurality of optical fiber strands are bundled by coating and integrated into a tape shape may be arranged and integrated into a tape shape by coating.

[0020]

The tape-type optical fiber according to the present invention comprises a plurality of tape-type optical fiber units in which a plurality of optical fiber strands are bundled with a coating and integrated into a tape form, in the arrangement direction of the optical fiber strands. Since it is integrated into a tape shape by coating, it is easy to suppress the difference in the angle of entry into the dice in the tape forming process, and the back tension applied to each optical fiber is controlled to control each optical fiber. Since the variation in the length of the wire can be easily suppressed, the skew can be easily suppressed even when the number of the optical fiber wires is large.

Further, since the optical fiber strands are all manufactured from the same base material, it is possible to suppress the variation in the refractive index of each optical fiber strand.

On the other hand, the tape-type optical fiber cord according to the present invention has the same effect as the above-mentioned tape-type optical fiber because the above-mentioned tape-type optical fiber is sheathed with a tensile strength member. Not only can it be obtained, but also it can be strong against external impacts, and the influence on skew due to changes in external conditions can be reduced.

Further, since all the optical fiber strands are manufactured from the same base material, the variation in the refractive index of each optical fiber strand can be suppressed.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a schematic structure of an embodiment of a tape-type optical fiber according to the present invention.

FIG. 2 is a sectional view showing a schematic structure of an embodiment of a tape-type optical fiber cord according to the present invention.

FIG. 3 is a graph showing a skew value of each optical fiber of a tape-type optical fiber, where (a) is a product of the present invention,
(B) is a conventional product.

FIG. 4 is a cross-sectional view illustrating a schematic structure of a conventional tape-type optical fiber.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Tape-type optical fiber 11 Optical fiber strand 12 Coating 13 Tape-type optical fiber unit 14 Coating 20 Tape-type optical fiber cord 21 Strength member 22 Sheath

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Mitsuo Usui Inventor Nippon Telegraph and Telephone Corporation 3-9-1-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo (72) Inventor Kosuke Katsura 3-192 Nishi-Shinjuku, Shinjuku-ku, Tokyo No. Nippon Telegraph and Telephone Corporation (72) Inventor Yasuhiro Ando 3-19-2 Nishi Shinjuku, Shinjuku-ku, Tokyo Japan Telegraph and Telephone Corporation (72) Inventor Mitsuo Ito 2-1-1 Sakae Oda, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture No. 1 Showa Electric Wire & Cable Co., Ltd. F term (reference) 2H001 BB15 DD07 2H046 AA02 AA05 AA62 AD22

Claims (4)

[Claims] 1. A plurality of tape-type optical fiber units in which a plurality of optical fiber strands are bundled with a coating and integrated into a tape shape are arranged in a plurality in the arrangement direction of the optical fiber strands, and are integrated into a tape shape by the coating. A tape-type optical fiber, characterized in that: 2. The tape-type optical fiber according to claim 1, wherein all of said optical fiber wires are manufactured from the same base material. 3. A tape type optical fiber cord, wherein the tape type optical fiber according to claim 1 is sheathed with a tensile strength member. 4. The tape-type optical fiber cord according to claim 3, wherein all of the optical fiber strands are manufactured from the same base material.