JP2001066480A - Optical fiber cable - Google Patents
Optical fiber cableInfo
- Publication number
- JP2001066480A JP2001066480A JP24425699A JP24425699A JP2001066480A JP 2001066480 A JP2001066480 A JP 2001066480A JP 24425699 A JP24425699 A JP 24425699A JP 24425699 A JP24425699 A JP 24425699A JP 2001066480 A JP2001066480 A JP 2001066480A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- fiber
- tape
- jacket
- fiber bundle
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、布設されたケーブ
ルの中間の任意のポイントから光ファイバ心線を分岐で
きる光ファイバケーブルに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical fiber cable capable of branching an optical fiber core from an arbitrary point in the middle of a laid cable.
【0002】[0002]
【従来の技術】光ファイバケーブルの基本構造の一つと
してルースチューブ構造がある。これは、ポリブチレン
・テレフタレートやポリプロピレン等のプラスチックか
らなるチューブ内に、光ファイバ心線やテープ心線を収
納し、隙間をジェリー等のゲル状フィラーで充填したも
のである。ルースチューブ構造のケーブルとしては、図
4(イ)に示すような、光ファイバ7を収納したチュー
ブ6の複数本を中心抗張力体10の周りに集合したもの
と、図4(ロ)に示すような、ケーブル中心部にルース
チューブ部を有し、その中にテープ心線1の積層体を収
納したセントラルコア型がある。2. Description of the Related Art A loose tube structure is one of the basic structures of an optical fiber cable. In this method, an optical fiber core wire or a tape core wire is accommodated in a tube made of plastic such as polybutylene terephthalate or polypropylene, and a gap is filled with a gel filler such as jelly. As a cable having a loose tube structure, as shown in FIG. 4A, a plurality of tubes 6 containing optical fibers 7 are gathered around a central tensile strength member 10, and as shown in FIG. In addition, there is a central core type having a loose tube portion in the center of the cable and in which a laminated body of the tape cores 1 is stored.
【0003】テープ心線は、光ファイバを複数本、例え
ば4本平行に配置し、それらを樹脂により一体化してテ
ープ状に形成したものである。そのようなテープ心線
は、完全な自由空間の中では自由な状態を取り得るた
め、各光ファイバは局所的に曲げられるようなことがな
く、伝送損失の増加はほとんどない。しかしながら、テ
ープ心線複数本を閉空間に置くと、閉空間の変化に伴っ
て発生する各テープ心線の動きを、各テープ心線相互で
それぞれ阻害し合い、一部のテープ心線に無理な曲げが
加わって、伝送損失が増加する。[0003] The tape core is formed by arranging a plurality of, for example, four, optical fibers in parallel, and integrating them with resin to form a tape. Since such a tape core can take a free state in a completely free space, each optical fiber does not bend locally and there is almost no increase in transmission loss. However, if multiple tape cores are placed in a closed space, the movements of the tape cores that occur with the change in the closed space are obstructed by each other, making it impossible for some tape cores. A gentle bending increases transmission loss.
【0004】そこで、従来のテープ心線を用いた光ファ
イバケーブルでは、テープ心線を2枚以上積層して集合
体を構成することにより、各テープ心線の挙動方向をほ
ぼ同一にして、一部のテープ心線のみが動きを阻害され
るのを防止するようにしている。そして、上記セントラ
ルコア型の光ファイバケーブルでは、そのようなテープ
心線積層体をルースチューブの中へ収納し、隙間をジェ
リー8で充填し、それらの上に抗張力体4,4とともに
外被3を形成している。そして、、ジェリー8の粘度を
適度に調整することにより、ケーブルに引っ張り、曲げ
等の外力が加わっても、テープ心線1がチューブ内で動
いて光ファイバに加わる応力を緩和できるようにしてい
る。Therefore, in a conventional optical fiber cable using a tape core, an aggregate is formed by laminating two or more tape cores, so that the behavior directions of the respective tape cores are made substantially the same, and the Only the tape core of the section is prevented from being hindered from moving. In the above-mentioned central core type optical fiber cable, such a tape core laminate is housed in a loose tube, the gap is filled with jelly 8, and the sheaths 3 together with the tensile strength members 4, 4 are placed thereon. Is formed. Then, by appropriately adjusting the viscosity of the jelly 8, even if an external force such as pulling or bending is applied to the cable, the tape core wire 1 moves in the tube and the stress applied to the optical fiber can be reduced. .
【0005】そのように、ルースチューブ構造の光ファ
イバケーブルは優れた特徴があるが、接続時の作業性が
悪いという欠点がある。すなわち、ケーブル接続時に、
ジェリー8を拭き取る作業が必要になり、その際に、テ
ープ心線1やその中の光ファイバを傷付けたり、折った
りしないように丁寧に作業する必要があって、時間がか
かる。As described above, the optical fiber cable having the loose tube structure has excellent characteristics, but has a disadvantage that workability at the time of connection is poor. That is, when connecting the cable,
The work of wiping the jelly 8 is required. At that time, it is necessary to work carefully so as not to damage or break the tape 1 or the optical fiber therein, which takes time.
【0006】そこで、我々は先に、特願平10-116230 号
で、テープ心線積層体の周りにジェリー8の代わりに繊
維体を配置することにより光ファイバを保護するように
した光ファイバケーブルを提案した。そのケーブルで
は、さらに、テープ心線積層体を、その中心軸を中心に
捻回させて、テープ心線積層体の各テープ心線が拘束さ
れ、積層崩れが少なくなるようにした。また、繊維体
は、ケーブル接続時にケーブルの中間部でテープ心線を
引き出す際に、繊維体の余長が大きく取れ、テープ心線
積層体と繊維体との間に隙間が生じて作業が容易になる
ように、繊維体をテープ心線積層体の外周に撚り合わせ
て配置するようにした。その結果、コストを抑えなが
ら、ケーブル接続時の作業性のよい光ファイバケーブル
が実現できた。In view of the above, we have previously disclosed in Japanese Patent Application No. 10-116230 an optical fiber cable in which an optical fiber is protected by arranging a fiber body instead of the jelly 8 around the tape core laminate. Suggested. In the cable, the tape core laminate was further twisted around its central axis so that each tape core of the tape core laminate was restrained, and the stacking collapse was reduced. In addition, when pulling out the ribbon at the middle part of the cable when connecting the cable, the extra length of the fiber can be large, and a gap is created between the laminated fiber ribbon and the fiber, making it easier to work. The fiber was twisted and arranged around the outer periphery of the tape core laminate. As a result, an optical fiber cable with good workability at the time of cable connection was realized while suppressing costs.
【0007】[0007]
【発明が解決しようとする課題】ところで、そのような
光ファイバケーブルでは、中間分岐作業時にケーブルの
外被を除去してテープ心線を取り出そうとする際に、繊
維体とテープ心線とを分離してテープ心線のみを取り出
す必要がある。しかしながら、上記光ファイバケーブル
では、テープ心線積層体の周りに繊維体が配置されてい
て、繊維体とテープ心線とが一体化している。そのた
め、中間分岐作業時、繊維体とテープ心線とを分離する
のに繊維体を切断して除去し、テープ心線のみを取り出
す際に繊維体とともにテープ心線を切断してしまわない
ように細心の注意が必要で、まだまだ作業性の改善に不
十分な点があるという問題点があった。By the way, in such an optical fiber cable, when the sheath of the cable is removed at the time of the intermediate branching operation and the tape core is taken out, the fibrous body and the tape core are separated. It is necessary to take out only the tape core. However, in the above-mentioned optical fiber cable, the fiber body is arranged around the tape core laminate, and the fiber body and the tape core are integrated. Therefore, at the time of intermediate branching work, cut and remove the fibrous body to separate the fibrous body and the tape core wire, and do not cut the tape core wire together with the fibrous body when taking out only the tape core wire. There has been a problem that careful attention is required, and there is still insufficient workability improvement.
【0008】本発明は、そのような問題点を解決し、中
間分岐作業時にテープ心線と繊維体との分離を容易にし
て、作業性を向上させることを目的とするものである。SUMMARY OF THE INVENTION An object of the present invention is to solve such a problem and to facilitate the separation of a tape core from a fibrous body during an intermediate branching operation, thereby improving workability.
【0009】[0009]
【課題を解決するための手段】前記課題を解決するた
め、請求項1に記載の光ファイバケーブルは、光ファイ
バ心線の外周全体を長手方向に連続した繊維体で覆い、
その外側に外被を形成した光ファイバケーブルにおい
て、前記繊維体は複数の繊維束に分割し、それぞれの繊
維束の外周に巻付材を螺旋状に巻き付けたことを特徴と
する。このようにすると、中間分岐作業時にテープ心線
と繊維束との分離が容易になって、作業性が向上する。According to a first aspect of the present invention, there is provided an optical fiber cable, wherein the entire outer periphery of the optical fiber core is covered with a continuous fiber body in a longitudinal direction.
In an optical fiber cable having an outer jacket formed thereon, the fibrous body is divided into a plurality of fiber bundles, and a winding material is spirally wound around the outer periphery of each fiber bundle. This facilitates separation of the fiber ribbon from the fiber bundle during the intermediate branching operation, and improves workability.
【0010】そして、請求項2に記載の光ファイバケー
ブルは、前記巻付材の色を前記繊維束の色と異ならせた
ことを特徴とする。このようにすると、分離作業時に、
それぞれの繊維束の識別が容易になって、作業性が向上
する。An optical fiber cable according to a second aspect is characterized in that the color of the wrapping material is different from the color of the fiber bundle. In this way, during separation work,
Identification of each fiber bundle becomes easy, and workability is improved.
【0011】また、請求項3に記載の光ファイバケーブ
ルは、前記巻付材の巻き付けピッチを500mm以下に
したことを特徴とする。このようにすると、中間分岐作
業時に外被を除去する通常の範囲500mm内で巻付材
が繊維束の周囲を1周完全に取り巻いていることになっ
て、各繊維束の分離が容易になる。In the optical fiber cable according to a third aspect of the present invention, the winding pitch of the winding material is set to 500 mm or less. In this case, the winding material completely surrounds the circumference of the fiber bundle within a normal range of 500 mm in which the jacket is removed at the time of the intermediate branching operation, and the separation of each fiber bundle becomes easy. .
【0012】[0012]
【発明の実施の形態】以下、本発明の実施の形態を図面
に基づいて詳細に説明する。図1は、本発明の一実施形
態の断面図である。図1において、1はテープ心線、2
は繊維束、3は外被、4は抗張力体である。Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a sectional view of one embodiment of the present invention. In FIG. 1, 1 is a tape core, 2
Is a fiber bundle, 3 is a jacket, and 4 is a tensile strength member.
【0013】テープ心線1は、平行に配置した4本の光
ファイバを樹脂に埋設して一体化してテープ状に形成さ
れている。そのようなテープ心線1,1,・・・を6枚
積層したテープ心線積層体の外周全体を、長手方向に連
続した複数本の繊維束2で包み込むように覆い、その外
側を抗張力体4,4を埋設した外被3で一体的に被覆し
ている。このように、テープ心線積層体の周囲を全体的
に取り囲むように複数本の繊維束2を添設し、テープ心
線積層体を一括して繊維束2により外側から覆って押さ
え込むことにより、各テープ心線1の個々が独自に動く
のを抑制して、一部のテープ心線1に局所的な座屈によ
るベンドの発生を抑えるようにしている。その上さら
に、全体に撚りを与えれば、テープ心線積層体の各テー
プ心線1が拘束され、積層崩れが少なくなる。The tape ribbon 1 is formed in a tape shape by embedding and integrating four optical fibers arranged in parallel in a resin. The entire outer periphery of the tape core laminate in which six such tape cores 1, 1,... Are stacked is covered so as to be wrapped with a plurality of fiber bundles 2 continuous in the longitudinal direction, and the outside thereof is a tensile strength member. 4 and 4 are integrally covered with a jacket 3 embedded therein. In this manner, by attaching a plurality of fiber bundles 2 so as to entirely surround the periphery of the tape core laminate, and covering and pressing the tape core laminate together from outside with the fiber bundle 2, The individual movement of each of the tape cores 1 is suppressed, and the occurrence of bend due to local buckling of some of the tape cores 1 is suppressed. Furthermore, if twist is given to the whole, each tape core 1 of a tape core laminated body will be restrained, and lamination collapse will decrease.
【0014】図2に、光ファイバケーブルの外被を一部
除去した状態を示す。図2において、5は巻付材であ
る。繊維束2は、ポリプロピレン等よりなる長尺の繊維
状体を適当な太さに束ね、その外周に巻付材5を螺旋状
に巻き付けて、個々の繊維束2に容易に分離できるよう
にしている。その結果、中間分岐作業時には、それぞれ
の繊維束2の巻付材5を摘んでテープ心線積層体から引
き離すことにより、個々の繊維束2毎に一括して除去で
きるようになり、テープ心線1の引き出し作業を手作業
で簡単に行うことが可能になる。FIG. 2 shows a state in which the jacket of the optical fiber cable is partially removed. In FIG. 2, reference numeral 5 denotes a wrapping material. The fiber bundle 2 is obtained by bundling a long fibrous body made of polypropylene or the like into an appropriate thickness, and wrapping the winding material 5 around the outer periphery of the bundle so that the individual fiber bundles 2 can be easily separated. I have. As a result, at the time of the intermediate branching operation, the wrapping material 5 of each fiber bundle 2 is picked up and separated from the tape core laminate, so that the individual fiber bundles 2 can be collectively removed. 1 can be easily performed manually.
【0015】繊維束2は、それ自体に撚りを与えてもよ
いし、撚りを与えなくてもよい。また、巻付材5は、テ
ープ状あるいは紐状とし、上記繊維状体と同一の繊維で
形成してもよいし、それとは異なる別の材料により形成
してもよい。さらに、巻付材5は、色を繊維束2の色と
異ならせることが好ましい。そのようにすれば、巻付材
5及び各繊維束2の識別が容易になって、より一層作業
性が向上する。The fiber bundle 2 may or may not be twisted by itself. Further, the wrapping material 5 may be in a tape shape or a string shape, and may be formed of the same fiber as the fibrous body, or may be formed of another material different from the above. Furthermore, it is preferable that the color of the wrapping material 5 be different from the color of the fiber bundle 2. By doing so, it becomes easy to identify the wrapping material 5 and each fiber bundle 2, and the workability is further improved.
【0016】また、中間分岐作業時にテープ心線を取り
出すために外被3を除去するが、その際、外被3は、通
常500mm程度の長さが除去される。そのことを考慮
して、巻付材5を巻き付けるピッチは、500mm以下
にする。そのようにすれば、図3に示すように、外被除
去区間内で、各繊維束2周囲を巻付材5が最低1周は巻
き付けられていることになって、外被除去区間内で繊維
束2がばらばらにならずに束が保持され、取扱いが容易
になる。The jacket 3 is removed in order to take out the tape core wire during the intermediate branching operation. At this time, the jacket 3 is usually removed by a length of about 500 mm. Taking this into consideration, the pitch at which the winding material 5 is wound is set to 500 mm or less. In this case, as shown in FIG. 3, at least one turn of the winding material 5 is wound around each of the fiber bundles 2 in the jacket removal section. The bundle is held without the fiber bundles 2 being separated, and handling becomes easy.
【0017】[0017]
【実施例】厚さ0.3mm、幅1.1mmの標準的な4
心テープ心線を6枚積層してテープ心線積層体を構成し
た。そして、ポリプロピレン材を6000デニールずつ
まとめ、その外周に3mm幅のポリプロピレンテープを
250mmピッチで巻き付けて繊維束2とした。そのよ
うな繊維束2を10本、テープ心線積層体の外周に添わ
せて、テープ心線積層体と10本の繊維束2とを一体的
にピッチ500mmで撚りを与えてケーブル心を構成し
た。そして、そのケーブル心の両側に、抗張力体4,4
として1.2mmの鋼線を2本平行に配置し、ポリエチ
レンよりなる外被3で一体化させて光ファイバケーブル
を形成した。DESCRIPTION OF THE PREFERRED EMBODIMENTS Standard 4 having a thickness of 0.3 mm and a width of 1.1 mm
Six cored ribbons were laminated to form a laminated tape core. Then, a 6000-denier polypropylene material was put together, and a 3 mm-width polypropylene tape was wound around the outer periphery at a pitch of 250 mm to form a fiber bundle 2. Ten such fiber bundles 2 are attached to the outer periphery of the tape core laminate, and the tape core laminate and the ten fiber bundles 2 are integrally twisted at a pitch of 500 mm to form a cable core. did. And, on both sides of the cable core, tensile strength members 4, 4
In this case, two 1.2 mm steel wires were arranged in parallel, and integrated with a jacket 3 made of polyethylene to form an optical fiber cable.
【0018】そして、その光ファイバケーブルを胴径1
000mmのドラムに巻いて、温度を−30〜70℃ま
で変化させて、波長1.55μmでの伝送損失を測定し
た。その結果、平均伝送損失は0.2dB/kmと、良
好な特性が得られた。また、中間の外被3を500mm
だけ除去して、各繊維束2の巻付材5を外側に引っ張っ
たところ、繊維束2は、テープ心線積層体から容易に分
離させることができた。Then, the optical fiber cable is connected to the body diameter 1
It was wound around a 000 mm drum, and the temperature was changed from -30 to 70 ° C., and the transmission loss at a wavelength of 1.55 μm was measured. As a result, the average transmission loss was 0.2 dB / km, and good characteristics were obtained. In addition, the middle jacket 3 is 500 mm
When the material 5 was removed and the wrapping material 5 of each fiber bundle 2 was pulled outward, the fiber bundle 2 could be easily separated from the tape core laminate.
【0019】なお、上記実施形態では、光ファイバ心線
としてテープ心線を用いたが、本発明を適用できる光フ
ァイバケーブルはそれに限定されず、光ファイバ単心線
を複数本集合した光ファイバケーブルにも適用できる。In the above embodiment, a tape core is used as an optical fiber core. However, the optical fiber cable to which the present invention can be applied is not limited thereto, and an optical fiber cable in which a plurality of single optical fiber cores are assembled. Also applicable to
【0020】[0020]
【発明の効果】本発明は、以上説明したように構成され
ているので、次に記載するような効果を奏する。すなわ
ち、請求項1に記載の光ファイバケーブルは、繊維体を
複数の繊維束に分割し、それぞれの繊維束の外周に巻付
材を螺旋状に巻き付けたので、中間分岐作業時にテープ
心線と繊維束との分離が容易になって、作業性が向上す
る。Since the present invention is configured as described above, it has the following effects. That is, in the optical fiber cable according to the first aspect, the fibrous body is divided into a plurality of fiber bundles, and the winding material is spirally wound around the outer periphery of each fiber bundle. Separation from the fiber bundle is facilitated, and workability is improved.
【0021】そして、請求項2に記載の光ファイバケー
ブルは、前記巻付材の色を繊維束の色と異ならせたの
で、分離作業時に、それぞれの繊維束が識別できて作業
がより容易になる。In the optical fiber cable according to the second aspect of the present invention, the color of the wrapping material is made different from the color of the fiber bundle. Become.
【0022】また、請求項3に記載の光ファイバケーブ
ルは、前記巻付材の巻き付けピッチを500mm以下に
したので、中間分岐作業時に外被を除去する通常の範囲
500mm内で巻付材が繊維束の周囲を1周完全に取り
巻いていることになって、各繊維束の分離が容易にな
る。Further, in the optical fiber cable according to the third aspect, the winding pitch of the winding material is set to 500 mm or less. By completely surrounding the circumference of the bundle, separation of each fiber bundle becomes easy.
【図1】本発明の一実施形態の断面図である。FIG. 1 is a cross-sectional view of one embodiment of the present invention.
【図2】図1の光ファイバケーブルの外被を一部除去し
た状態を示す図である。FIG. 2 is a view showing a state in which a jacket of the optical fiber cable of FIG. 1 is partially removed;
【図3】中間分岐作業時の外被除去部分を示す図であ
る。FIG. 3 is a diagram showing a jacket removal portion during an intermediate branching operation.
【図4】従来の光ファイバケーブルの断面図である。FIG. 4 is a sectional view of a conventional optical fiber cable.
1…テープ心線 2…繊維束 3…外被 4…抗張力体 5…巻付材 6…チューブ 7…光ファイバ 8…ジェリー 9…外被 10…中心抗張力体 DESCRIPTION OF SYMBOLS 1 ... Tape core wire 2 ... Fiber bundle 3 ... Jacket 4 ... Tensile member 5 ... Wrapping material 6 ... Tube 7 ... Optical fiber 8 ... Jerry 9 ... Jacket 10 ... Center tensile member
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小林 一郎 東京都千代田区丸の内2丁目6番1号 古 河電気工業株式会社内 (72)発明者 岩田 秀行 東京都千代田区大手町二丁目3番1号 日 本電信電話株式会社内 Fターム(参考) 2H001 BB16 BB23 DD06 DD15 KK17 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Ichiro Kobayashi 2-6-1 Marunouchi, Chiyoda-ku, Tokyo Inside Furukawa Electric Co., Ltd. (72) Inventor Hideyuki Iwata 2-3-1 Otemachi, Chiyoda-ku, Tokyo No. Nippon Telegraph and Telephone Corporation F-term (reference) 2H001 BB16 BB23 DD06 DD15 KK17
Claims (3)
連続した繊維体で覆い、その外側に外被を形成した光フ
ァイバケーブルにおいて、前記繊維体は複数の繊維束に
分割し、それぞれの繊維束の外周に巻付材を螺旋状に巻
き付けたことを特徴とする光ファイバケーブル。1. An optical fiber cable in which the entire outer circumference of an optical fiber core is covered with a fiber body continuous in a longitudinal direction and an outer jacket is formed on the outside thereof, the fiber body is divided into a plurality of fiber bundles, An optical fiber cable, wherein a winding material is spirally wound around the outer circumference of a fiber bundle.
らせたことを特徴とする請求項1記載の光ファイバケー
ブル。2. The optical fiber cable according to claim 1, wherein the color of the wrapping material is different from the color of the fiber bundle.
m以下にしたことを特徴とする請求項1又は2記載の光
ファイバケーブル。3. A winding pitch of the winding material is 500 m.
The optical fiber cable according to claim 1 or 2, wherein the length is not more than m.
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JP24425699A JP3710040B2 (en) | 1999-08-31 | 1999-08-31 | Fiber optic cable |
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JP24425699A JP3710040B2 (en) | 1999-08-31 | 1999-08-31 | Fiber optic cable |
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JP2001066480A true JP2001066480A (en) | 2001-03-16 |
JP3710040B2 JP3710040B2 (en) | 2005-10-26 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003121711A (en) * | 2001-10-10 | 2003-04-23 | Alcatel | Optical fiber cable having protection system |
-
1999
- 1999-08-31 JP JP24425699A patent/JP3710040B2/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2003121711A (en) * | 2001-10-10 | 2003-04-23 | Alcatel | Optical fiber cable having protection system |
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