JPS63306407A - Tape type optical fiber unit - Google Patents
Tape type optical fiber unitInfo
- Publication number
- JPS63306407A JPS63306407A JP62142898A JP14289887A JPS63306407A JP S63306407 A JPS63306407 A JP S63306407A JP 62142898 A JP62142898 A JP 62142898A JP 14289887 A JP14289887 A JP 14289887A JP S63306407 A JPS63306407 A JP S63306407A
- Authority
- JP
- Japan
- Prior art keywords
- layer
- optical fiber
- protective layer
- coating
- coating 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
- 239000013307 optical fiber Substances 0.000 title claims abstract description 47
- 239000011247 coating layer Substances 0.000 claims abstract description 37
- 239000011241 protective layer Substances 0.000 claims abstract description 32
- 239000010410 layer Substances 0.000 claims abstract description 26
- 230000005540 biological transmission Effects 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 11
- 230000002093 peripheral effect Effects 0.000 claims abstract description 3
- 230000003287 optical effect Effects 0.000 claims description 9
- 239000000835 fiber Substances 0.000 claims description 4
- 229920005989 resin Polymers 0.000 abstract description 15
- 239000011347 resin Substances 0.000 abstract description 15
- 239000000463 material Substances 0.000 abstract description 7
- 238000003848 UV Light-Curing Methods 0.000 abstract 1
- 239000006082 mold release agent Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 229920001296 polysiloxane Polymers 0.000 description 4
- 239000004677 Nylon Substances 0.000 description 3
- 238000005253 cladding Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229920001778 nylon Polymers 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 230000000704 physical effect Effects 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- 239000001993 wax Substances 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 1
- 239000004372 Polyvinyl alcohol Substances 0.000 description 1
- -1 and specifically Substances 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052731 fluorine Inorganic materials 0.000 description 1
- 239000011737 fluorine Substances 0.000 description 1
- 238000007526 fusion splicing Methods 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 229920002451 polyvinyl alcohol Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 229920001187 thermosetting polymer Polymers 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
- G02B6/4403—Optical cables with ribbon structure
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、複数本の光ファイバ素線を平面的に並列状に
配置し、これらの外周を一括的に保護層で包被されてな
るテープ型光ファイバユニットに関する。[Detailed Description of the Invention] [Industrial Application Field] The present invention is an optical fiber that is formed by arranging a plurality of optical fibers in parallel on a plane and covering their outer peripheries all at once with a protective layer. This invention relates to a tape type optical fiber unit.
従来より、第２図に示すようなテープ型光ファイバユニ
ットが知られている。これはコアとクラッドとを有する
光伝送部１にシリコーンからなる被＆層７を設けた複数
本の光ファイバ素線９を平面的に並列状に並べ、光ファ
イバ素線集合体を形成し、この光ファイバ素線集合体に
ナイロンからなる保護層８を一体的に被覆したものであ
る。ところが被覆層７がシリコーンからなり、保護層８
がナイロンからなる従来のテープ型光ファイバユニット
においては、この材料の組み合わせが原因で時間の経過
とともに水素が発生し、これが光伝送部１内で次第に水
酸基に変化し、光伝送部１の伝送特性を劣化させる場合
があることがわかってきた。また、前記シリコーンおよ
びナイロンは熱を利用して硬化させるので、硬化するの
に時間がかかり、製造線速か上がらず、このテープ型光
ファイバユニットの価格を下げることができないという
問題もある。このような問題に対して、これまで種々の
材料検討がなされ、その結果、被覆層７および保護層８
をともに紫外線硬化性樹脂で構成することが提案された
。このように紫外線硬化性樹脂で被覆層７、保護層８を
構成するテープ型光ファイバユニ・ソトにおいては、水
素が発生しｆこくく、それゆえ、経時的に光伝送部の伝
送特性が劣化することもほとんどない。しかも、紫外線
硬化性樹脂は光を利用するため硬化速度が速いので、製
造コストの低減が図れ、したがって価格の安いものがで
きるというメリットもある。Conventionally, a tape-type optical fiber unit as shown in FIG. 2 has been known. In this method, a plurality of optical fiber wires 9 each having an optical transmission section 1 having a core and a cladding and a covering layer 7 made of silicone are arranged in parallel on a plane to form an optical fiber wire assembly. This optical fiber wire assembly is integrally coated with a protective layer 8 made of nylon. However, since the covering layer 7 is made of silicone, the protective layer 8
In conventional tape-type optical fiber units, in which nylon is used, hydrogen is generated over time due to the combination of materials, and this gradually changes to hydroxyl groups within the optical transmission section 1, which deteriorates the transmission characteristics of the optical transmission section 1. It has been found that it can cause deterioration. In addition, since the silicone and nylon are cured using heat, it takes time to cure them, and there is also the problem that the manufacturing speed cannot be increased and the price of the tape-type optical fiber unit cannot be reduced. To address these problems, various material studies have been conducted, and as a result, the coating layer 7 and the protective layer 8
It was proposed that both be made of ultraviolet curable resin. In this way, in the tape-type optical fiber UniSoto in which the coating layer 7 and the protective layer 8 are made of ultraviolet curable resin, hydrogen is difficult to generate, and therefore, the transmission characteristics of the optical transmission part deteriorate over time. There's very little to do. Moreover, since UV-curable resins use light, they have a fast curing speed, so they have the advantage of reducing manufacturing costs and being able to produce products at low prices.
ところが、このように被覆層７および保護層８をともに
紫外線硬化性樹脂で構成したものは、ケーブル接続時１
こテープ型光ファイバユニットの保護層８の皮剥き性が
悪く、保護層８とその内部に包被されている被覆層７が
くっついてしまい、なかなかうまく保護層８のみを剥ぎ
取れないという新たな問題点があることがわかった。However, when the coating layer 7 and the protective layer 8 are both made of ultraviolet curable resin, 1.
The peelability of the protective layer 8 of this tape-type optical fiber unit is poor, and the protective layer 8 and the coating layer 7 wrapped inside it stick together, making it difficult to peel off the protective layer 8 alone. It turned out that there was a problem.
しかも、保護１８をなんとかして剥ぎ取った後に、光フ
ァイバ素線集合体から光ファイバ素線を一心ずつバラバ
ラの状態に分離する際にも、となりどおしの光ファイバ
素線の被覆層７が相互番こくっついてしまい、いわゆる
縦裂き性が悪いという別の問題点も有することが判明し
た。Moreover, even when the optical fibers are separated one by one from the optical fiber assembly after the protection 18 has been peeled off, the coating layer 7 of each optical fiber is removed. It was also found that there was another problem in that the sheets stuck to each other and had poor longitudinal tearability.
本発明のテープ型光ファイバユニットハ上述の問題点に
鑑みなされたもので、光伝送部と被覆層とを有する光フ
ァイバ素線を複数本、平面的並列上に配置し、これらの
外周を一括的１こ保腹島で包被されてなるテープ型光フ
ァイバユニットであって、前記光ファイバ素線の被覆層
の外周面および前記被覆層と前記保護層との界面には、
離型剤層が形成されてなることを特徴とするものである
。The tape-type optical fiber unit of the present invention has been developed in view of the above-mentioned problems, in which a plurality of optical fibers each having an optical transmission section and a coating layer are arranged parallel to each other on a plane, and the outer periphery of these fibers is arranged in parallel. A tape-type optical fiber unit covered with a protective layer, the outer peripheral surface of the coating layer of the optical fiber strand and the interface between the coating layer and the protective layer,
It is characterized in that a release agent layer is formed.
本発明のテープ型光ファイバユニットは上述の構成とす
ることにより、被覆層と保護層との剥離性がよいので保
護層の皮剥きが容易となる。By having the tape-type optical fiber unit of the present invention having the above-described structure, the coating layer and the protective layer can be easily peeled off, so that the protective layer can be easily peeled off.
また、保護層を剥き取った後の光ファイバ集合体から、
光ファイバ素線を一心ずつのバラバラの状態に分離する
際流も被覆層とおしが相互にくっつきにくいので、縦裂
き性も良好である。In addition, from the optical fiber assembly after peeling off the protective layer,
The coating layer and the strands are less likely to stick to each other during the current that separates the optical fiber strands into individual fibers, resulting in good vertical tearing properties.
以下、本発明のテープ型光ファイバユニＶ）の実施例に
ついて図面を参照して説明する。Hereinafter, embodiments of the tape-type optical fiber unit V) of the present invention will be described with reference to the drawings.
第１図は本発明のテープ型光ファイバ二二−Ｊトの一実
施例を示す断面図である。同図において、１は光伝送部
、２．３は被覆層で、本実施例では二重構造としており
、２は第１被覆層、６は第２被覆層、４は保＆Ｍ、５は
離型剤層、６は光ファイバ素線を示す。FIG. 1 is a sectional view showing an embodiment of the tape-type optical fiber 22-J of the present invention. In the figure, 1 is an optical transmission part, 2.3 is a coating layer, and in this example, it has a double structure, 2 is a first coating layer, 6 is a second coating layer, 4 is a protection & M, and 5 is a separation layer. The mold agent layer 6 indicates an optical fiber wire.
光伝送部１はコアとクラッドとを有し、必要に応じてク
ラッドの外周にサポート層を形成しておいてもよい。こ
の光伝送部１の外周には例えば紫外線硬化樹脂等からな
る第１被覆層２、さらにその外周に、同種材料からなる
第２被覆層６とよりなる２重の被覆層が形成なされてい
る。なお、被覆層を二重構造とせず、−重構造であって
も良いことはいうまでもない。そして、第２被覆層乙の
長手方向外周面には雛形剤層５が設けられており、これ
により一心の光ファイバ素線６が形成されている。この
光ファイバ素線６を複数本集め、平面的に並列状に配置
し、これにより光ファイバ素線集合体を形成し、そして
これらの外周を一括的に包被するような、例えば紫外線
樹脂等からなる保護層４が設けられる。The optical transmission section 1 has a core and a cladding, and a support layer may be formed around the cladding if necessary. A double coating layer is formed on the outer periphery of the light transmission section 1, consisting of a first coating layer 2 made of, for example, an ultraviolet curing resin, and a second coating layer 6 made of the same material on the outer periphery. It goes without saying that the coating layer may not have a double structure but may have a double structure. A template layer 5 is provided on the outer circumferential surface of the second coating layer B in the longitudinal direction, thereby forming a single optical fiber strand 6. A plurality of these optical fiber wires 6 are collected, arranged in parallel on a plane, thereby forming an optical fiber wire assembly, and the outer periphery of these wires is covered all at once with, for example, ultraviolet resin or the like. A protective layer 4 consisting of the following is provided.
離型剤層５は第２被覆層３と保護層４とが剥離しやすい
ように、また隣接する第２被覆層６どおしが相互にくっ
つき合わないようにするための介在層であり、換言すれ
ば表面活性剤、あるいは界面活性剤とか呼ばれる材料を
適宜選定することができる。材料としては潤滑剤やロウ
類等があり、具体的には例えばフッ素系化合物、シリコ
ーン系化合物、ウレタン系化合物ポリビニルアルコール
、パラフィン系化合物、ワックス類、等が用いられる。The mold release agent layer 5 is an intervening layer so that the second coating layer 3 and the protective layer 4 can be easily peeled off, and also to prevent adjacent second coating layers 6 from sticking to each other. In other words, a surface active agent or a material called a surfactant can be appropriately selected. Examples of the material include lubricants and waxes, and specifically, fluorine-based compounds, silicone-based compounds, urethane-based compounds, polyvinyl alcohol, paraffin-based compounds, waxes, etc. are used.
このような材料を用いて離形剤層５を有するテープ型光
ファイバユニットを製造する番こは、第３図に示すよう
な製造装置によって得られる。A method for manufacturing a tape-type optical fiber unit having a mold release agent layer 5 using such a material can be obtained by a manufacturing apparatus as shown in FIG.
第３図は、本発明のテープ型光ファイバユニットを製造
するための概略構成図である。同図において、６．６・
・・は光ファイバ素線、１０．１０・・・は繰り出しボ
ビン、１１はスリー、１２はキャプスタン、１３はガイ
ドロール、１４は巻取ドラム、４０は保護層形成装置、
４１は硬化装置、５０は離型剤層形成装置を示す。FIG. 3 is a schematic configuration diagram for manufacturing the tape-type optical fiber unit of the present invention. In the same figure, 6.6・
... is an optical fiber wire, 10.10 ... is a feeding bobbin, 11 is a sleeve, 12 is a capstan, 13 is a guide roll, 14 is a winding drum, 40 is a protective layer forming device,
41 is a curing device, and 50 is a mold release agent layer forming device.
繰り出しボビン１０．１０・・・から送り出された複数
本の光ファイバ素線６．６・・・は、光伝送部と被覆層
（複数層であってもよい）を有しており、２．、！Ｊ
−１１により平面的に並列状に配置される。この間に、
離型剤層形成装置５０内を通過する際に、光ファイバの
被覆層の外周に離形剤層が形成される。形成する方法と
しては、ディッピングやフェルトによる塗布等、適宜の
手段が採用される。そして、−ｊ、リ−１１−仁よって
所定の配置に並べられた後、保護層形成装置４０を通過
し、例えば紫外−硬化樹脂等が押し出し形成される。そ
して、硬化装置４１、例えば紫外縁照射ランプ等を通過
させて樹脂を硬化し、キャプスタン、１２からガイドロ
ール１３を介して巻取ドラム１４に巻取られる。The plurality of optical fiber strands 6, 6, . ,! J
-11, they are arranged in parallel on a plane. During this time,
When passing through the release agent layer forming apparatus 50, a release agent layer is formed around the outer periphery of the coating layer of the optical fiber. As a forming method, appropriate means such as dipping or coating with felt may be employed. Then, after being arranged in a predetermined arrangement by -J and Lee-11-Jin, they pass through a protective layer forming device 40, and are extruded with, for example, an ultraviolet-curing resin. The resin is then passed through a curing device 41, such as an ultraviolet irradiation lamp, to cure the resin, and then wound onto a winding drum 14 from a capstan 12 via a guide roll 13.
なお、ここで離型剤層５の厚みについて、少し述べる。Note that the thickness of the mold release agent layer 5 will be briefly described here.
本発明者らは光ファイバ外周番仁各種厚みの離型剤層を
形成し、剥離性、縦裂き性の良否を検討した結果、厚み
によっては、剥離性、縦裂き性は良好になっても、光学
的伝送特性に影響をおよぼす場合があるという知見を得
た。The present inventors formed mold release agent layers of various thicknesses on the outer circumference of optical fibers and examined the quality of peelability and longitudinal tearability. It was found that this may affect the optical transmission characteristics.
すなわち、離型剤層をあまりにも厚（形成すると、物理
的構造が変わることになるので、例えば伝送損失が増加
したり、機械的強度、特に側圧特性が低下したりという
物理特性が低下するというものである。In other words, if the mold release agent layer is formed too thick, the physical structure will change, resulting in a decrease in physical properties such as an increase in transmission loss and a decrease in mechanical strength, especially lateral pressure properties. It is something.
したがって、これらの物理特性を低下させない範囲で、
かつ良好な剥離性、縦裂き件を得るための離型剤層の厚
みとしては、サブミクロフル数ミクロン程屓であること
が最適であるという結論ＩＬ達した。Therefore, as long as these physical properties are not degraded,
In addition, the conclusion was reached that the optimal thickness of the release agent layer to obtain good peelability and longitudinal tearing properties is a submicron to a few microns.
さらに、本実施例としては、被覆層２．３と保護層４と
は両者とも紫外線硬化樹脂による例を示しているが、何
もこれに限定されるものではなく、各種の樹脂の組み合
わせは適宜に選定しうるものであることはいうまでもな
い。したがって、熱硬化性樹脂どおしや熱可塑性樹脂ど
おしあるいはこれらの複合タイプ、さらにはこれらと紫
外線硬化性樹脂との組み合せ等が選択されるものである
。Furthermore, in this embodiment, the coating layer 2.3 and the protective layer 4 are both made of ultraviolet curing resin, but the invention is not limited to this, and combinations of various resins may be used as appropriate. Needless to say, it can be selected. Therefore, a combination of thermosetting resins, thermoplastic resins, a combination thereof, and a combination of these and an ultraviolet curable resin are selected.
以上詳述のとおり、本発明のテープ型光ファイバユニッ
トは光ファイバ素線の被覆層と保護層との界面には、離
型剤層が形成されてなることにより、被覆層と保護層と
の剥離性が良いので、保護層の皮剥ぎが容易となる。ま
た、保護層を剥ぎ取った後の光ファイバ素線集合体から
、光ファイバ素線を−８ずつのバラバラの状態に分離す
る際も、被覆層どおしが相互にくっつきにくいので、縦
裂き性も良好である。したがって、テープ型光ファイバ
ユニットを用いて各種配線、布設する場合に、光ファイ
バ素線どおしを融着接続する準備作業である皮剥ぎ、縦
裂きの作業性が向上し、能率アップが図れるという効果
を奏するものである。As detailed above, in the tape-type optical fiber unit of the present invention, a release agent layer is formed at the interface between the coating layer and the protective layer of the optical fiber, so that the coating layer and the protective layer are Since the peelability is good, the protective layer can be easily peeled off. Also, when separating the optical fibers into pieces of -8 pieces from the optical fiber assembly after removing the protective layer, the coating layers are less likely to stick to each other, so the fibers can be split vertically. The quality is also good. Therefore, when performing various types of wiring and installation using a tape-type optical fiber unit, the workability of stripping and vertical tearing, which is the preparation work for fusion splicing optical fiber strands together, is improved and efficiency can be increased. This has this effect.
第１図は本発明のテープ型光ファイバユニットの一実施
例を示す断面図、第２図は従来例のこれらの図において
、１は光伝送部、２．３は被覆層で２は第１被覆層、３
は第２被覆層、４は保護層、５は離型剤層、６は光ファ
イバ素線である。FIG. 1 is a sectional view showing an embodiment of the tape-type optical fiber unit of the present invention, and FIG. 2 is a sectional view of a conventional example. Covering layer, 3
4 is a second coating layer, 4 is a protective layer, 5 is a release agent layer, and 6 is an optical fiber wire.
Claims (1)
面的並列状に配置し、これらの外周を一括的に保護層で
包被されてなるテープ型光ファイバユニットであつて、
前記光ファイバ素線の被覆層の外周面および前記被覆層
と前記保護層との界面には、離型剤層が形成されてなる
ことを特徴とするテープ型光ファイバユニットA tape-type optical fiber unit in which a plurality of optical fiber wires each having an optical transmission part and a coating layer are arranged in parallel on a plane, and the outer circumferences of these fibers are collectively covered with a protective layer,
A tape-type optical fiber unit, characterized in that a release agent layer is formed on the outer peripheral surface of the coating layer of the optical fiber strand and at the interface between the coating layer and the protective layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62142898A JPS63306407A (en) | 1987-06-08 | 1987-06-08 | Tape type optical fiber unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62142898A JPS63306407A (en) | 1987-06-08 | 1987-06-08 | Tape type optical fiber unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS63306407A true JPS63306407A (en) | 1988-12-14 |
Family
ID=15326164
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62142898A Pending JPS63306407A (en) | 1987-06-08 | 1987-06-08 | Tape type optical fiber unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63306407A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019142842A1 (en) * | 2018-01-18 | 2019-07-25 | 住友電気工業株式会社 | Method and apparatus for manufacturing optical fiber tape cores |
-
1987
- 1987-06-08 JP JP62142898A patent/JPS63306407A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019142842A1 (en) * | 2018-01-18 | 2019-07-25 | 住友電気工業株式会社 | Method and apparatus for manufacturing optical fiber tape cores |
| JPWO2019142842A1 (en) * | 2018-01-18 | 2021-01-14 | 住友電気工業株式会社 | Optical fiber tape core wire manufacturing method and manufacturing equipment |
| US11181709B2 (en) | 2018-01-18 | 2021-11-23 | Ssumitomom Electric Industries, Ltd. | Manufacturing method of optical fiber ribbon and manufacturing apparatus thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP3314495B2 (en) | Optical fiber ribbon | |
| TWI802927B (en) | Optical Fiber Ribbon and Optical Cable | |
| JPS592881B2 (en) | optical fiber ribbon | |
| WO2005101080A1 (en) | Optical fiber tape unit and optical fiber cable | |
| JP2950264B2 (en) | Manufacturing method of optical fiber ribbon | |
| JPS63306407A (en) | Tape type optical fiber unit | |
| JP2014085512A (en) | Optical fiber tape core wire and optical fiber cable | |
| JP3166602B2 (en) | Optical fiber manufacturing method | |
| JPH0256510A (en) | Production of tape type coated optical fibers | |
| JPH11302039A (en) | Production of colored optical fiber | |
| JPH0862466A (en) | Fiber tape for ultra-multiple cores | |
| JPH01107865A (en) | Coloring device for optical fiber | |
| JPS63281109A (en) | Fiber for light transmission | |
| JP7505132B1 (en) | Optical fiber ribbon and slotless optical cable | |
| JP2002341208A (en) | Coated optical fiber of optical fiber ribbon and optical fiber cable | |
| JPH0749447Y2 (en) | Optical fiber tape core | |
| JPH08292328A (en) | Method for removing coating of coated optical fiber | |
| JPS59213647A (en) | Preparation of cable core of optical fiber | |
| JPH0568685B2 (en) | ||
| JP2003241039A (en) | Coated optical fiber ribbon and method for manufacturing the same | |
| JPH08292347A (en) | Coated optical fiber | |
| JP3462634B2 (en) | Optical fiber core and method of removing coating | |
| JP2005321419A (en) | Optical fiber tape unit and optical fiber cable | |
| JP2002174759A (en) | Coated optical fiber tape | |
| JPS5910905A (en) | Production of optical cable |