JPS5811905A - Optical cable - Google Patents
Optical cableInfo
- Publication number
- JPS5811905A JPS5811905A JP56109993A JP10999381A JPS5811905A JP S5811905 A JPS5811905 A JP S5811905A JP 56109993 A JP56109993 A JP 56109993A JP 10999381 A JP10999381 A JP 10999381A JP S5811905 A JPS5811905 A JP S5811905A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- plastic pipe
- plastic
- pipe
- layer
- 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.)
- Pending
Links
- 230000003287 optical effect Effects 0.000 title claims abstract description 7
- 239000004033 plastic Substances 0.000 claims abstract description 22
- 229920003023 plastic Polymers 0.000 claims abstract description 22
- 229920001169 thermoplastic Polymers 0.000 claims abstract description 9
- 239000000835 fiber Substances 0.000 claims abstract description 7
- 230000008018 melting Effects 0.000 claims abstract description 3
- 238000002844 melting Methods 0.000 claims abstract description 3
- 239000004416 thermosoftening plastic Substances 0.000 claims description 7
- 239000013307 optical fiber Substances 0.000 abstract description 14
- 238000001125 extrusion Methods 0.000 abstract description 3
- 239000003365 glass fiber Substances 0.000 abstract 1
- 230000001681 protective effect Effects 0.000 abstract 1
- 239000011521 glass Substances 0.000 description 6
- 239000010410 layer Substances 0.000 description 6
- 239000004677 Nylon Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 229920006244 ethylene-ethyl acrylate Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
- G02B6/4432—Protective covering with fibre reinforcements
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Insulated Conductors (AREA)
Abstract
Description
【発明の詳細な説明】
本発明は、プラスチックパイプ内に収納された複数の光
フアイバ素線を有する九ケーブルの改良に関するもので
ある。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a cable having a plurality of optical fiber strands housed within a plastic pipe.
この棹の光ケーブルにおいてプラスチックパイプｉｄ通
常ナイロン等から成っており、このプラスチックパイプ
ー：光ファイバ木線に比べて等画線膨張係数が大きく、
従って特に−３０℃のように低温時１／（はグラスチッ
クパイプの収１１１１が大きく素線が径方向に曲ってマ
イクロベンド奮起し低温損失特性が極端ＶＣ増加する欠
点があった。In this optical fiber cable, the plastic pipe ID is usually made of nylon, etc., and this plastic pipe has a larger isolinear expansion coefficient than the optical fiber wood wire.
Therefore, especially at low temperatures such as -30 DEG C., 1/(1111) of the glass pipe has a large convergence, causing the strands to bend in the radial direction and cause microbends, resulting in an extreme VC increase in low-temperature loss characteristics.
不発明の目的は、光フアイバ心線の低温損失特性を改善
した九ケーブルを提供）゛ることにある０
本発明の実施例を図面′？ｒ：奈照（−て＋ｉＫ＋１４
１１にのべると、第１図は本発明の光ケーブル１０の基
本例を示し、この光グープル１０は複数本の光フアイバ
素線１２がたるみをもって収納されたナイロンの如きグ
ラスチックパイプ１４とこのグラスチックパイプ１４の
上ｅ（押出被覆式れｆｒ、繊維強化熱可塑性グラスナッ
ク層１６とを不°Ｔるユニットコード１８から成ってい
る。グラスチックパイプ１４と繊維強化熱可ｍ性グラス
チック層１６１Ｊ接宥していることが望捷しい０各光フ
アイバ索線１２は例えはコアとクラッドからなる元ファ
イバとその上に形成された保峡用の１次コー）・及び又
に、緩衝層とから成っている。繊維強化熱Ｉ３Ｉ塑性プ
ラスチック層１６は、ガラス＃Ｊｌ！紐が６７４人さ；
／”した熱可塑性プラスチックから成り、この熱可塑性
プラスチックげプラスチックパイプ１４の融点よりも低
い融点を有する材料、例えばエチレン−エチルアクリレ
ートコポリマー又はエチレン−酢酸ビニルコポリマーが
用いられる。このように融点の低い熱可塑性プラスチッ
ク全相いると、押出成形時に内側のプラスチックパイプ
１４ヲ変形させることかすく、プラスチックパイプ１４
と繊ｍ強化熱可塑性プラスチック層１６との総合等価線
膨張係数は小さくなって低温時の収縮が小さくなる。従
って、光フアイバ素線１２の低温損失特性が増加するこ
とはない。An object of the invention is to provide a cable with improved low-temperature loss characteristics of optical fiber core wire. r: Nateru (-te+iK+14
11, FIG. 1 shows a basic example of the optical cable 10 of the present invention. The top of the pipe 14 (extrusion coated) consists of a unit cord 18 that connects the fiber-reinforced thermoplastic glass layer 16. The glass pipe 14 and the fiber-reinforced thermoplastic glass layer 161J It is desirable that each optical fiber cable 12 is made up of, for example, an original fiber consisting of a core and a cladding, a primary fiber for a protective layer formed thereon, and a buffer layer. ing. The fiber reinforced thermal I3I plastic layer 16 is made of glass #Jl! There are 674 strings;
A material having a melting point lower than that of the thermoplastic pipe 14, such as an ethylene-ethyl acrylate copolymer or an ethylene-vinyl acetate copolymer, is used. If all the plastics are made of plastic, it will be easier to deform the inner plastic pipe 14 during extrusion molding.
The total equivalent linear expansion coefficient of the fiber-reinforced thermoplastic layer 16 becomes small, and the shrinkage at low temperatures becomes small. Therefore, the low-temperature loss characteristics of the optical fiber 12 do not increase.
第２図は本発明の他の実施例を示し、この実施例では中
心テンション部材２０のまわりに第１図に示す如き枚数
本のユニットコード１８が撚合せ等によって乗合され、
その上に金属内張プラスチック外被２２が施されている
。FIG. 2 shows another embodiment of the present invention, in which several unit cords 18 as shown in FIG. 1 are strung together by twisting or the like around a central tension member 20.
A metal-lined plastic jacket 22 is applied thereon.
本発明によれは、上記のように、光ファイバ゛素線が収
納されたプラスチックパイプはその上に施された繊維強
化熱可塑性プラスチック層によって全体的に線ＡＩ脹係
数を小さくしているので光フアイバ素線の低温損失特性
を著しく改善することができる実益がある。According to the present invention, as described above, the plastic pipe in which the optical fiber strand is housed has a fiber-reinforced thermoplastic layer applied thereon to reduce the overall linear AI expansion coefficient, so that the optical fiber There is a practical benefit in that the low temperature loss characteristics of the fiber wire can be significantly improved.
第１図及び第２図り１本発りｊに係る光ケーブルの横断
面図である。
工０・・・・・・光ケーブル、１２・・・・・・光フア
イバ素線、１４・・・・・・プラスチックパイプ、１６
・・・・・・繊維強化熱可ｖＪ１件グラスチックノー。FIG. 1 is a cross-sectional view of the optical cable according to FIG. 1 and FIG. 0...Optical cable, 12...Optical fiber wire, 14...Plastic pipe, 16
...1 fiber-reinforced thermoplastic VJ glass no.
Claims (2)
クパイプと前記プラスチックパイプの外周に被覆され前
６ピプラスチツクパイプの融点より低い融点ヲ肩する繊
維強化熱可塑性プラスチック層とを有するユニットコー
ドから成っていることを特徴とする光ケーブル。(1) A unit cord consisting of a plastic pipe in which a plurality of nine-fiber strands are housed, and a fiber-reinforced thermoplastic layer coated around the outer periphery of the plastic pipe and having a melting point lower than that of the front six-pin plastic pipe. An optical cable characterized by:
範凹第１項に記載の光ケーブル。(2) The optical cable according to claim 1, which is formed by collecting a plurality of unit cords.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56109993A JPS5811905A (en) | 1981-07-16 | 1981-07-16 | Optical cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56109993A JPS5811905A (en) | 1981-07-16 | 1981-07-16 | Optical cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5811905A true JPS5811905A (en) | 1983-01-22 |
Family
ID=14524360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56109993A Pending JPS5811905A (en) | 1981-07-16 | 1981-07-16 | Optical cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5811905A (en) |
-
1981
- 1981-07-16 JP JP56109993A patent/JPS5811905A/en active Pending
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