JPS60196712A - Waterproof optical fiber cable - Google Patents
Waterproof optical fiber cableInfo
- Publication number
- JPS60196712A JPS60196712A JP59053879A JP5387984A JPS60196712A JP S60196712 A JPS60196712 A JP S60196712A JP 59053879 A JP59053879 A JP 59053879A JP 5387984 A JP5387984 A JP 5387984A JP S60196712 A JPS60196712 A JP S60196712A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- oxidation induction
- waterproofing
- transmission loss
- induction period
- 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 37
- 239000000203 mixture Substances 0.000 claims abstract description 28
- 238000004078 waterproofing Methods 0.000 claims abstract description 25
- 230000006698 induction Effects 0.000 claims abstract description 22
- 230000003647 oxidation Effects 0.000 claims abstract description 22
- 238000007254 oxidation reaction Methods 0.000 claims abstract description 22
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052802 copper Inorganic materials 0.000 claims abstract description 11
- 239000010949 copper Substances 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 abstract description 16
- 238000002474 experimental method Methods 0.000 abstract description 4
- 239000000945 filler Substances 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 5
- 230000007774 longterm Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000000576 coating method Methods 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000011241 protective layer Substances 0.000 description 1
- 229920002379 silicone rubber Polymers 0.000 description 1
- 239000004945 silicone rubber Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
Landscapes
- Insulated Conductors (AREA)
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
本発明はケーブル内に防水用充填混和物を充填してなる
防水型光フアイバケーブルに関するものである。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a waterproof optical fiber cable in which the cable is filled with a waterproof filling mixture.
、〔従来技術〕
従来よりケーブルの防水特性を向上させるため、ケーブ
ル内に防水用充填混和物を充填してなる防水型光フアイ
バケーブルが開発されている。これは第１図に示すよう
に、石英ガラス系のファイバにシリコーンゴムとナイロ
ンの被覆を施したもの、紫外線硬化樹脂とナイロンの被
覆を施したもの、あるいはまた、紫外線硬化樹脂のみ被
覆したもの等々、各種被覆材料を被覆した光ファイバを
複数本撚合せて光フアイバユニット１を構成し、該光フ
アイバユニットｌを複数本、ステンレス線等の抗張力体
２のまわりに集合し、このように集合したものの空隙部
に防水用充填混和物３を充填し、プラスチックテープ等
からなるコアラツブ層４を設け、ポリエチレン等からな
る保護層５を設けるものである。, [Prior Art] In order to improve the waterproof properties of cables, waterproof optical fiber cables have been developed in which the cables are filled with waterproofing filler mixtures. As shown in Figure 1, these include silica glass fibers coated with silicone rubber and nylon, ultraviolet curing resin and nylon coatings, or only ultraviolet curing resin coatings. An optical fiber unit 1 is constructed by twisting a plurality of optical fibers coated with various coating materials, and a plurality of optical fiber units 1 are assembled around a tensile strength body 2 such as a stainless steel wire, and assembled in this way. A waterproofing filler mixture 3 is filled in the voids of the material, a core lubricant layer 4 made of plastic tape or the like is provided, and a protective layer 5 made of polyethylene or the like is provided.
このように防水用充填混和物をケーブル内に充填するこ
とによりケーブルの防水性は著しく向上する。さて、従
来使用されている防水用充填混和物３は、はとんどが２
００℃で銅接触状態での酸化誘導期（銅皿にサンプルを
入れて測定する）が２０分以下のものであるが、最近、
酸化誘導期が２０分以下という前述の防水用充填混和物
を充填した光フアイバケーブルにあって、光ファイバの
特に１．２μｍ以上の長波長帯で伝送損失の経時変化が
著しいことが判明している。By filling the cable with the waterproof filling mixture in this manner, the waterproof properties of the cable are significantly improved. Now, the conventionally used waterproofing filler mixture 3 is mostly 2
The oxidation induction period (measured by placing the sample in a copper dish) in contact with copper at 00℃ is less than 20 minutes, but recently,
It has been found that in optical fiber cables filled with the above-mentioned waterproofing filler mixture, which has an oxidation induction period of 20 minutes or less, the transmission loss of the optical fiber changes significantly over time, especially in the long wavelength band of 1.2 μm or more. There is.
尚、この理由として次のことが考えられている。The following is thought to be the reason for this.
すなわち、被覆を施されている光ファイノくのまわりに
は多量の前記防水用充填混和物が充填されているが、そ
の防水用充填混和物より長期的に水素が発生し、それが
石英ガラス系のファイバ内に入り５水酸基（ＯＨ基）を
発生せしめるが、この水素と、またこの水素によってフ
ァイバ内で発生した水酸基とにより、光ファイバの長波
長帯で経時的に伝送損失が増加する、というものである
。In other words, a large amount of the above-mentioned waterproofing filling mixture is filled around the coated optical fiber, but hydrogen is generated over a long period of time from the waterproofing filling mixture. enters the fiber and generates 5-hydroxyl groups (OH groups), but due to this hydrogen and the hydroxyl groups generated within the fiber by this hydrogen, transmission loss increases over time in the long wavelength band of the optical fiber. It is something.
以上のように、従来よりケーブルに使用されている２０
０℃、銅接触状態での酸化誘導期が２０分以下という防
水用充填混和物を充填した光フアイバケーブルにおいて
、この防水用充填混和物が原因と推定される長波長帯で
の経時的な伝送損失の増加が見られる。As mentioned above, 20
In an optical fiber cable filled with a waterproofing filling mixture that has an oxidation induction period of 20 minutes or less when in contact with copper at 0°C, transmission over time in a long wavelength band that is presumed to be caused by this waterproofing filling mixture. We are seeing an increase in losses.
前記問題に鑑み本発明の目的は、長期的に見ても長波長
帯での伝送損失の増加が少ない防水型光フアイバケーブ
ルを得ることにある。In view of the above problems, an object of the present invention is to obtain a waterproof optical fiber cable in which the increase in transmission loss in the long wavelength band is small even in the long term.
前記目的を達成すべく本発明の防水型光フアイバケーブ
ルは、ケーブル内に防水用充填混和物を充填してなる防
水型光フアイバケーブルにおいて、前記防水用充填混和
物は２００℃における銅接触状態での酸化誘導期が少な
くとも３０分以上であることを特徴とするものである。In order to achieve the above object, the waterproof optical fiber cable of the present invention is a waterproof optical fiber cable in which the cable is filled with a waterproofing filling mixture, wherein the waterproofing filling mixture is in contact with copper at 200°C. The oxidation induction period is at least 30 minutes.
以下本発明の実施例を詳細に説明する。防水用充填混和
物を充填してなる第１図に示すような防水型光フアイバ
ケーブルにあっては、光ファイバの経時的伝送損失変化
を推定する方法として、光ファイバを加熱して、加熱後
の損失増を測定する方法が一般的であり、通常２００℃
で４時間の加熱後損失増加の少ないもの程長期的に安定
している、つまり経時変化が少ないものと推定される。Examples of the present invention will be described in detail below. In the case of a waterproof optical fiber cable as shown in Fig. 1, which is filled with a waterproofing filler mixture, the method of estimating the change in transmission loss over time of the optical fiber is to heat the optical fiber and then A common method is to measure the increase in loss at 200°C.
It is presumed that the smaller the increase in loss after 4 hours of heating is, the more stable it is over the long term, that is, the less it changes over time.
そこで本発明者はいくつかの要因を変化させて、前記加
熱実験を行ったが、そのうちの一つとして酸化誘導期を
種々の値に調整した防水用充填混和物に光ファイバを浸
漬した状態で２００℃、４時間加熱後裔光ファイバの伝
送損失の増加を測定した。この実験の結果、酸化誘導期
の長い防水用充填混和物に浸漬した光ファイバの方が酸
化誘導期の短いものに浸漬したものより光ファイバの伝
送損失の増加が少ないことを見い出した。ここで前記酸
化誘導期の測定は、防水用充填混和物を銅またはアルミ
ニウムの皿に入れて窒素ガス雰囲気で昇温し、一定温度
（通常２００℃）に達したら、酸素雰囲気に切換え、前
記一定温度に保ちつつ、熱量計で発熱のピーク値が現わ
れるまでの時間を読み取り、これを酸化誘導期の値とす
る。尚、銅皿を用いた場合、この値は最も短いものにな
る。従って銅と接触させない場合はもつと大きな値とな
る。尚、本発明にて規定される酸化誘導期は銅皿にて測
定した値である。さて、前述のごとく、防水用充填混和
物の酸化誘導期と光ファイバの長期的経時変化との関係
を見い出した本発明者は、さらに実験、検討を重ねた結
果、２００℃において少なくとも３０分以上の酸化誘導
期を有する防水用充填混和物では、２００℃で４時間の
加熱後光ファイバの伝送損失の増加は１．５５μｍの波
長において１ｄＢ／ｋｍ以下であり、従って、このよう
な防水用混和物を用いれば経時変化の少ない、つまり長
期的に安定な防水型光フアイバケーブルが得られること
が確認された。Therefore, the present inventor conducted the above-mentioned heating experiment by changing several factors, one of which was to immerse the optical fiber in a waterproofing filling mixture in which the oxidation induction period was adjusted to various values. After heating at 200° C. for 4 hours, the increase in transmission loss of the descendant optical fiber was measured. As a result of this experiment, it was found that optical fibers immersed in a waterproofing filler mixture with a long oxidation induction period had a smaller increase in transmission loss than those immersed in a waterproofing mixture with a short oxidation induction period. Here, the oxidation induction period is measured by placing the waterproof filling mixture in a copper or aluminum dish and increasing the temperature in a nitrogen gas atmosphere, and when it reaches a certain temperature (usually 200°C), switching to an oxygen atmosphere and While maintaining the temperature, read the time until the peak value of heat generation appears with a calorimeter, and use this as the value of the oxidation induction period. Note that this value is the shortest when a copper plate is used. Therefore, if it is not brought into contact with copper, it will have a large value. The oxidation induction period defined in the present invention is a value measured using a copper plate. Now, as mentioned above, the present inventor, who discovered the relationship between the oxidation induction period of the waterproofing filling mixture and the long-term aging of the optical fiber, has conducted further experiments and studies, and has found that For waterproofing filler admixtures with an oxidation induction period of It was confirmed that by using this material, it is possible to obtain a waterproof optical fiber cable that shows little change over time, that is, is stable over a long period of time.
本発明の具体例を比較例と共に示す。尚、使用している
光ファイバは、いずれの場合もＭＣＶ、Ｄ法及びＶＡＤ
法にて製造したコア径５０μｍ、クラツド径１２５μｍ
の石英ガラス系ファイバに、ヤング率０．２ ｋｇ ／
ｍ＋＋ｔの紫外線硬化樹脂を外径０．４朋になるよう
塗布し、硬化させたものである。Specific examples of the present invention will be shown together with comparative examples. In addition, the optical fibers used are MCV, D method and VAD in all cases.
Core diameter 50μm, cladding diameter 125μm manufactured by the method
The silica glass fiber has a Young's modulus of 0.2 kg/
An ultraviolet curing resin of m++t was applied to an outer diameter of 0.4 mm and cured.
また、この光ファイバの防水用充填混和物中での加熱浸
漬条件は温度２００℃で４時間保持するというものであ
る。Further, the heating immersion conditions for this optical fiber in the waterproofing filling mixture are such that the optical fiber is maintained at a temperature of 200° C. for 4 hours.
この表の結果をグラフにしたものが第２図である。第２
図は横軸が酸化誘導期、縦軸が伝送損失の増加量を示し
ている。この第２図から、酸化誘導期が３０分以上であ
れば、２００℃、４時間の加熱浸漬後の光ファイバの伝
送損失増加量が１ｄＢ／ｋｍ以下となり、経時変化が少
ないことが推定される。Figure 2 is a graph of the results of this table. Second
In the figure, the horizontal axis shows the oxidation induction period, and the vertical axis shows the amount of increase in transmission loss. From this figure 2, it is estimated that if the oxidation induction period is 30 minutes or more, the increase in transmission loss of the optical fiber after 4 hours of heating at 200°C will be 1 dB/km or less, and there will be little change over time. .
以上述べたように本発明によれば、長期的に見ても長波
長帯での伝送損失の増加の少ない。As described above, according to the present invention, the increase in transmission loss in the long wavelength band is small even in the long term.
すなわち、長期信頼性の高い防水型光ファイバ錫 ケーブルを受ることかできる。In other words, long-term reliable waterproof optical fiber tin Can you receive cable?
第１図は本発明の係る防水′型光ファイバケーブルの横
断面図、第２図は防水用充填混和物の酸化誘導期と防水
用充填混和物に加熱浸漬させた光ファイバの伝送損失増
加量の関係を示すグラフである。Fig. 1 is a cross-sectional view of a waterproof 'type optical fiber cable according to the present invention, and Fig. 2 shows the oxidation induction period of the waterproofing filling mixture and the increase in transmission loss of the optical fiber heated and immersed in the waterproofing filling mixture. It is a graph showing the relationship.
Claims (1)
フアイバケーブルにおいて、前記防水用充填混和物は２
００℃における銅接触状態での酸化誘導期が少なくとも
３０分以上であることを特徴とする防水型光フアイバケ
ーブル。In a waterproof optical fiber cable in which the cable is filled with a waterproofing filling mixture, the waterproofing filling mixture contains 2
1. A waterproof optical fiber cable having an oxidation induction period of at least 30 minutes when in contact with copper at 00°C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59053879A JPS60196712A (en) | 1984-03-21 | 1984-03-21 | Waterproof optical fiber cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59053879A JPS60196712A (en) | 1984-03-21 | 1984-03-21 | Waterproof optical fiber cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS60196712A true JPS60196712A (en) | 1985-10-05 |
Family
ID=12955031
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59053879A Pending JPS60196712A (en) | 1984-03-21 | 1984-03-21 | Waterproof optical fiber cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS60196712A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51121346A (en) * | 1975-04-16 | 1976-10-23 | Nippon Telegr & Teleph Corp <Ntt> | Optical fiber cable and the production method |
-
1984
- 1984-03-21 JP JP59053879A patent/JPS60196712A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51121346A (en) * | 1975-04-16 | 1976-10-23 | Nippon Telegr & Teleph Corp <Ntt> | Optical fiber cable and the production method |
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