JPH04338126A - Method for screening of optical fiber - Google Patents
Method for screening of optical fiberInfo
- Publication number
- JPH04338126A JPH04338126A JP3132174A JP13217491A JPH04338126A JP H04338126 A JPH04338126 A JP H04338126A JP 3132174 A JP3132174 A JP 3132174A JP 13217491 A JP13217491 A JP 13217491A JP H04338126 A JPH04338126 A JP H04338126A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- screening
- strength
- reliability
- present
- 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 33
- 238000012216 screening Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims description 13
- 230000003749 cleanliness Effects 0.000 claims description 6
- 230000006866 deterioration Effects 0.000 description 6
- 239000011347 resin Substances 0.000 description 5
- 229920005989 resin Polymers 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000635 electron micrograph Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
Description
【０００１】0001
【産業上の利用分野】本発明は、光ファイバ素線をその
強度の低下を伴うことなくスクリーニングする方法に関
するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for screening optical fibers without reducing their strength.
【０００２】0002
【従来の技術】光ファイバ素線の強度を向上するために
、従来から光ファイバ素線をスクリーニングする際に、
光ファイバ素線の全長に渡って所定の応力を負荷して低
強度部を取除くことが行なわれている。この応力は、例
えば、所定の重量の重りを付けた動滑車状のリールに光
ファイバ素線を通過することによって負荷される。[Prior Art] Conventionally, in order to improve the strength of optical fiber, when screening optical fiber,
A predetermined stress is applied over the entire length of the optical fiber to remove low-strength portions. This stress is applied, for example, by passing the optical fiber through a movable pulley-like reel that is weighted with a predetermined weight.
【０００３】0003
【発明が解決しようとする課題】一方、近年、通信回線
の著しい利用拡大と多様化とに伴って通信ケーブルの高
密度多心化の要求が高まり、従ってこの通信ケーブルを
構成する光ファイバ素線は、現状の信頼性を保持しつつ
細径化することが要求されている。光ファイバ素線は、
樹脂被覆を薄肉化して細径化することが検討されている
。しかし、このようにして薄肉の樹脂被覆を有する細径
の光ファイバ素線を従来方法でスクリーニング処理する
と、光ファイバ素線の強度の低下を招き、所謂スクリー
ニング劣化が認められる問題があった。[Problems to be Solved by the Invention] On the other hand, in recent years, with the remarkable expansion and diversification of the use of communication lines, the demand for high-density multi-core communication cables has increased. There is a need to reduce the diameter while maintaining the current reliability. The optical fiber wire is
Consideration has been given to making the resin coating thinner and smaller in diameter. However, when a thin optical fiber coated with a thin resin coating is subjected to screening using the conventional method, there is a problem in that the strength of the optical fiber decreases, resulting in so-called screening deterioration.
【０００４】本発明の目的は、上記の問題を解決し、光
ファイバ素線の信頼性を損なうことがなく、スクリーニ
ング処理することができる方法を提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a method that solves the above-mentioned problems and allows screening of optical fibers without impairing their reliability.
【０００５】[0005]
【課題を解決するための手段】本発明は、上記の課題を
解決するため、光ファイバ素線をクリーン度クラス１０
４ 以下に保たれた環境下でスクリーニング処理するこ
とを特徴とする光ファイバ素線のスクリーニング方法を
提供することにある。ここで、クリーン度クラス１０４
以下とは、１立方フィートの体積中に０．５μｍ以上
のダストが１０４ 個以下であることである。[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides an optical fiber having a cleanliness class 10.
4. It is an object of the present invention to provide a method for screening optical fibers, which is characterized in that screening is performed in an environment maintained as follows. Here, cleanliness class 104
Below means that there are no more than 104 particles of 0.5 μm or larger in a volume of 1 cubic foot.
【０００６】[0006]
【作用】このように、光ファイバ素線をスクリーニング
処理する際にその環境をクリーン度クラス１０４ 以下
に保つと、細径化した光ファイバ素線のスクリーニング
劣化を招くことがなく高い信頼性を保持することができ
る。[Function] In this way, when screening optical fiber strands, if the environment is maintained at a cleanliness class of 104 or below, high reliability is maintained without causing deterioration in screening of thinned optical fiber strands. can do.
【０００７】[0007]
【実施例】本発明の実施例を詳細にのべると、外径が１
２５μｍのシングルモードガラスファイバを線引きし、
その直後に紫外線硬化樹脂で被覆し、外径が１８０μｍ
で長さが５０００ｍの光ファイバ素線を製造した。この
光ファイバ素線の信頼性を向上させるために、全長に歪
０．６％（０．５４ｋｇｆ）を負荷しつつスクリーニン
グ処理した。本発明の方法では、このスクリーニング処
理をクリーン度クラス１０４ 以下のクリーンルーム内
で行なわれた。[Example] To describe the example of the present invention in detail, the outer diameter is 1
Draw a 25 μm single mode glass fiber,
Immediately after that, it is coated with ultraviolet curing resin and the outer diameter is 180 μm.
An optical fiber strand with a length of 5000 m was manufactured. In order to improve the reliability of this optical fiber, screening was performed while applying strain of 0.6% (0.54 kgf) to the entire length. In the method of the present invention, this screening process was performed in a clean room with a cleanliness class of 104 or lower.
【０００８】次に、光ファイバ素線について引張強度試
験をした結果を破断強度と信頼性との関係を示すワイブ
ル分布で示すと、図１に示す通りとなる。この図１から
分かるように、光ファイバ素線は、スクリーニング処理
する前は、低強度部のない信頼性の高い光ファイバ素線
である。[0008] Next, the results of a tensile strength test on the optical fiber strand are shown in FIG. 1 using a Weibull distribution showing the relationship between breaking strength and reliability. As can be seen from FIG. 1, the optical fiber is a highly reliable optical fiber without any low-strength portions before being subjected to the screening process.
【０００９】その後、この光ファイバ素線に通常のスク
リーニング処理を施すと、破断回数が６回となって引張
強度試験の結果と矛盾し、低強度部を有することが確認
された。この光ファイバ素線の破断面の電子顕微鏡写真
を解析した結果、光ファイバ素線のガラスコアではなく
樹脂被覆が劣化しているために破断したことが確認され
た。この樹脂の劣化は、光ファイバ素線のスクリーニン
グ処理時にリールと光ファイバ素線との間に工場内に浮
遊するダストが巻き込まれることに起因しているものと
推定した。[0009] When this optical fiber was then subjected to a normal screening process, the number of breaks was 6, contradicting the results of the tensile strength test, and it was confirmed that it had a low strength portion. As a result of analyzing an electron micrograph of the fractured surface of this optical fiber, it was confirmed that the optical fiber was broken due to deterioration of the resin coating, not the glass core. It was presumed that this deterioration of the resin was caused by dust floating in the factory getting caught between the reel and the optical fiber during the screening process of the optical fiber.
【００１０】次に、本発明の方法によって、上記のクリ
ーンルーム内でスクリーニング処理を施した光ファイバ
素線は破断が生ずることがなく、スクリーニング劣化が
観察されなかった。これによって、工場内に浮遊するダ
ストが光ファイバ素線に巻き込まれることがなく、スク
リーニング劣化を抑制することができることが明らかと
なった。[0010] Next, the optical fiber strands subjected to the screening treatment in the above-mentioned clean room by the method of the present invention did not break, and no screening deterioration was observed. It has become clear that this prevents dust floating in the factory from getting caught up in the optical fibers, and that screening deterioration can be suppressed.
【００１１】[0011]
【発明の効果】本発明によれば、上記のように、光ファ
イバ素線のスクリーニング処理をクリーン度クラス１０
４ 以下に保たれている環境下で行なうので、細径化し
た光ファイバ素線のスクリーニング劣化を招くことがな
く、高い信頼性を保持することができる実益がある。Effects of the Invention According to the present invention, as described above, the screening process for optical fibers can be carried out to a cleanliness level of class 10.
Since the screening is carried out in an environment maintained at 4 or less, screening of thinned optical fibers does not deteriorate, and high reliability can be maintained.
【図１】光ファイバ素線の引張強度の結果による破断強
度と信頼性（確率）との関係を示すワイブル分布図であ
る。FIG. 1 is a Weibull distribution diagram showing the relationship between breaking strength and reliability (probability) based on the results of the tensile strength of an optical fiber strand.
Claims (1)
０４ 以下に保たれた環境下でスクリーニング処理する
ことを特徴とする光ファイバ素線のスクリーニング方法
。[Claim 1] The optical fiber has cleanliness class 1.
04. A method for screening an optical fiber, the method comprising screening under an environment maintained at the following conditions:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3132174A JPH04338126A (en) | 1991-05-09 | 1991-05-09 | Method for screening of optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3132174A JPH04338126A (en) | 1991-05-09 | 1991-05-09 | Method for screening of optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH04338126A true JPH04338126A (en) | 1992-11-25 |
Family
ID=15075107
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3132174A Pending JPH04338126A (en) | 1991-05-09 | 1991-05-09 | Method for screening of optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH04338126A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5703988A (en) * | 1994-02-15 | 1997-12-30 | Sumitomo Electric Industries, Ltd. | Coated optical fiber and fabrication process therefor |
-
1991
- 1991-05-09 JP JP3132174A patent/JPH04338126A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5703988A (en) * | 1994-02-15 | 1997-12-30 | Sumitomo Electric Industries, Ltd. | Coated optical fiber and fabrication process therefor |
| US5835656A (en) * | 1994-02-15 | 1998-11-10 | Sumitomo Electric Industries, Ltd. | Coated optical fiber |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5835656A (en) | Coated optical fiber | |
| JPH04338126A (en) | Method for screening of optical fiber | |
| JPH097426A (en) | Elevator cable | |
| JPH0519144A (en) | Optical fiber | |
| JPH0560954A (en) | Fine diameter optical fiber | |
| US4892572A (en) | Optical fiber drawing apparatus | |
| DE2545317A1 (en) | Optical fibre having loose protective sheath - where fibre and sheath have same coefft. of thermal expansion, to avoid microcracks | |
| JP2003241039A (en) | Coated optical fiber ribbon and method for manufacturing the same | |
| JPS612111A (en) | Optical cable | |
| JPH11133277A (en) | Extremely small diameter optical fiber cord and its manufacture | |
| JPH03283317A (en) | Manufacture of optical cable for optical-fiber combined overhead earth wire | |
| JPS6066214A (en) | Coated optical fiber | |
| JPH11202174A (en) | Coated optical fiber tapes | |
| JPH01214809A (en) | Fiber for light transmission | |
| JP2002029784A (en) | Flame retardant high strength coated optical fiber | |
| JPS5948706A (en) | Optical fiber unit | |
| JPH0611634A (en) | Small-diameter coated optical fiber | |
| JPS6119461Y2 (en) | ||
| JPH0979959A (en) | Device and method for screening optical fiber | |
| JPS5840505A (en) | Optical fiber cable for command guidable flying object | |
| JPS60195040A (en) | Optical fiber | |
| JPS63146009A (en) | Multicore package concentrated core conductors | |
| JPH04371906A (en) | Coated optical fiber with colored layer | |
| JPS5946607A (en) | Optical cable unit | |
| JPH01138514A (en) | Optical fiber |