JPS6039609A - Water shielding type optical fiber cable - Google Patents
Water shielding type optical fiber cableInfo
- Publication number
- JPS6039609A JPS6039609A JP58147792A JP14779283A JPS6039609A JP S6039609 A JPS6039609 A JP S6039609A JP 58147792 A JP58147792 A JP 58147792A JP 14779283 A JP14779283 A JP 14779283A JP S6039609 A JPS6039609 A JP S6039609A
- Authority
- JP
- Japan
- Prior art keywords
- water
- optical fiber
- layer
- hydrophobic
- materials
- 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 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title abstract description 29
- 239000000463 material Substances 0.000 claims abstract description 30
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 11
- 239000000203 mixture Substances 0.000 claims abstract description 8
- 239000000945 filler Substances 0.000 claims description 11
- 239000011358 absorbing material Substances 0.000 claims description 8
- 230000002265 prevention Effects 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 5
- 230000035515 penetration Effects 0.000 claims description 2
- 239000004519 grease Substances 0.000 abstract description 9
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052782 aluminium Inorganic materials 0.000 abstract description 4
- 238000012856 packing Methods 0.000 abstract description 4
- 238000004804 winding Methods 0.000 abstract description 3
- NIXOWILDQLNWCW-UHFFFAOYSA-N 2-Propenoic acid Natural products OC(=O)C=C NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 abstract description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 abstract description 2
- 229920000881 Modified starch Polymers 0.000 abstract description 2
- 239000004368 Modified starch Substances 0.000 abstract description 2
- 229920002396 Polyurea Polymers 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 abstract description 2
- 229920002125 Sokalan® Polymers 0.000 abstract description 2
- 239000000292 calcium oxide Substances 0.000 abstract description 2
- 235000012255 calcium oxide Nutrition 0.000 abstract description 2
- 239000001913 cellulose Substances 0.000 abstract description 2
- 229920002678 cellulose Polymers 0.000 abstract description 2
- 229910052744 lithium Inorganic materials 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 abstract description 2
- 239000000741 silica gel Substances 0.000 abstract description 2
- 229910002027 silica gel Inorganic materials 0.000 abstract description 2
- SMZOUWXMTYCWNB-UHFFFAOYSA-N 2-(2-methoxy-5-methylphenyl)ethanamine Chemical compound COC1=CC=C(C)C=C1CCN SMZOUWXMTYCWNB-UHFFFAOYSA-N 0.000 abstract 1
- 229920002134 Carboxymethyl cellulose Polymers 0.000 abstract 1
- 229920002472 Starch Polymers 0.000 abstract 1
- 239000001768 carboxy methyl cellulose Substances 0.000 abstract 1
- 235000010948 carboxy methyl cellulose Nutrition 0.000 abstract 1
- 239000008112 carboxymethyl-cellulose Substances 0.000 abstract 1
- 235000019426 modified starch Nutrition 0.000 abstract 1
- 239000000344 soap Substances 0.000 abstract 1
- 239000008107 starch Substances 0.000 abstract 1
- 235000019698 starch Nutrition 0.000 abstract 1
- 239000010410 layer Substances 0.000 description 12
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 239000004575 stone Substances 0.000 description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 2
- 239000002250 absorbent Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 229920000620 organic polymer Polymers 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000012790 adhesive layer Substances 0.000 description 1
- 229910052791 calcium Inorganic materials 0.000 description 1
- 239000011575 calcium Substances 0.000 description 1
- 239000013626 chemical specie Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920000578 graft copolymer Polymers 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 229910010272 inorganic material Inorganic materials 0.000 description 1
- 239000011147 inorganic material Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229940062717 keppra Drugs 0.000 description 1
- 239000002655 kraft paper Substances 0.000 description 1
- HPHUVLMMVZITSG-LURJTMIESA-N levetiracetam Chemical compound CC[C@@H](C(N)=O)N1CCCC1=O HPHUVLMMVZITSG-LURJTMIESA-N 0.000 description 1
- 229920000609 methyl cellulose Polymers 0.000 description 1
- 239000001923 methylcellulose Substances 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000004078 waterproofing Methods 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B7/00—Insulated conductors or cables characterised by their form
- H01B7/17—Protection against damage caused by external factors, e.g. sheaths or armouring
- H01B7/28—Protection against damage caused by moisture, corrosion, chemical attack or weather
- H01B7/282—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable
- H01B7/285—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable
- H01B7/288—Preventing penetration of fluid, e.g. water or humidity, into conductor or cable by completely or partially filling interstices in the cable using hygroscopic material or material swelling in the presence of liquid
-
- 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
- G02B6/44384—Means specially adapted for strengthening or protecting the cables the means comprising water blocking or hydrophobic materials
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Insulated Conductors (AREA)
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
本発明は走水防止用充填物を用いた遮水形光ファイバケ
ーブルに関する。DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a water-shielded optical fiber cable using a filler for preventing water running.
遮水層と該遮水層の内側に存在する多数本の光ファイバ
との間の空間に走水防止用充填物（以下、単に充填物と
いう）を充填した構造の遮水形光ファイバケーブルは従
来公知である。A water-shielding optical fiber cable has a structure in which the space between a water-shielding layer and a large number of optical fibers existing inside the water-shielding layer is filled with a filling material for preventing water running (hereinafter simply referred to as "filling material"). It is conventionally known.
ところで、上記の空間のすべてが充填物にて充填されて
始めて充分な走水防止が達成されるが、実際問題として
、一般に完全充填は不可能である。たとえば、使用する
充填物が常温で固体であるときは加熱溶融して使用され
るが、ケーブル製造層の温度低下にもとすく充填物の体
積収縮により間隙が生じる。ケーブルの遮水層は、普通
、金属ラミネートテープの縦添えによって形成されるが
、このとき、多数本の光ファイバからなるコアに充分量
の充填物が含まれているとき上記テープの縦添の重ね部
に充填物がはみ出して該重ね部同士の接着がはみ出しだ
充填物により阻害される問題があるため、実際のケーブ
ル製造においては、か＼るはみ出しを防止する目的から
コア中への充填物の充填を多少控目とすることがある。By the way, sufficient water running prevention can only be achieved when all of the above-mentioned spaces are filled with the filler, but as a practical matter, complete filling is generally impossible. For example, when the filler used is solid at room temperature, it is heated and melted before use, but as the temperature of the cable manufacturing layer decreases, the filler shrinks in volume and creates gaps. The water-shielding layer of a cable is usually formed by longitudinally applying metal laminate tape.In this case, when the core consisting of multiple optical fibers contains a sufficient amount of filler, the longitudinally applying the tape There is a problem in which the filling material protrudes into the overlapped parts and the adhesion between the overlapped parts is inhibited by the protruding filling material, so in actual cable manufacturing, filling material is added into the core in order to prevent such protrusion. The amount of filling may be slightly reduced.
この場合も充填物の充填が不充分となる。またかりに充
填物を充分とすると、布設作業時の不当外力がそのま＼
光ファイバと側圧をあたえ光ファイバの損失が増加する
ことがある。゛この理由からも充填を控目とすることが
ある。In this case as well, the filling becomes insufficient. However, if the filling material is sufficient, undue external force during installation work will be avoided.
Applying lateral pressure to the optical fiber may increase optical fiber loss.゛For this reason too, filling may be done sparingly.
本発明は、充填物の充填が不充分であっても走水防止性
能の優れた遮水形光ファイ、にケーブルを提案するもの
であって、充填物として、ベースとなる疎水性物と吸水
性物とからなる混合物を用いることを特徴とするもので
ある。The present invention proposes a water-shielding optical fiber cable that has excellent water running prevention performance even if the filling is insufficiently filled. It is characterized by using a mixture consisting of
〔実施例にもとず〈本発明の一層詳細な説明〕付図は、
本発明の実施例の断面図であって、高抗張力の有機高分
子繊維、たとえばケプラ、ＦＲＰ、や金属線などのテン
７ヨンメンバー１１を中心に６本の光ファイバ１２を集
合し、更にその上に抑え巻きテープ１３を巻回してなる
光フアイバ６芯ユニツト１の８ユニツトな電気絶縁ケー
ブル、金属線、有機高分子繊維などからなるテンション
メンバー２の周りに集合し、更にその上にアルミニウム
や鉛などの金属のラミネートテープを縦添えして形成し
てなる遮水層３を設け、該ラミネートテープの接着剤層
と接着した状態でポリエチレン、ポリ塩化ビニルなどの
シース材からなる押出保護シース層４が施され、遮水層
３の内側空間には充填物５が充填されている。[Based on the Examples [More Detailed Description of the Present Invention] The accompanying drawings are:
1 is a sectional view of an embodiment of the present invention, in which six optical fibers 12 are assembled around a tensile member 11 made of high tensile strength organic polymer fibers, such as Keppra, FRP, or metal wire; A 6-core optical fiber unit 1 is formed by winding a restraining tape 13 on top of the tension member 2, which consists of 8 units of electrically insulated cables, metal wires, organic polymer fibers, etc. A water-blocking layer 3 is formed by longitudinally adhering a laminated tape of metal such as lead, and an extruded protective sheath layer made of a sheath material such as polyethylene or polyvinyl chloride is attached to the adhesive layer of the laminated tape. 4 is applied, and the inner space of the water-blocking layer 3 is filled with a filler 5.
本発明においては充填物５として、ベースとなる疎水性
物と吸水性物との混合物が用いられる。疎水性物として
は、たとえば本発明と同種の遮水形光ファイバケーブル
の充填物として使用されていたものや、それと同類の機
能を奏し得る各種の材料が用いられる。たとえば米国ウ
イットコ社の充填物Φ５Ｂや多くのグリス類、例えばポ
リウレアグリース、リチウム石ケングリース、カルシウ
ム石ケングリース、アルミニウム石ケングリース、ベン
トングリース、複合アルミニウム石ケングリース、複合
カル／ラム石ケングリースなどが例示できる。このうち
、ＡＳＴＭ Ｄ−２１７で測定した常温での混和ちょう
度が８５〜４７５好ましくは１５０〜４５０特に２００
〜４００のグリス類は、常温での充填作業を可能にし、
而して冷却にもとすく体積収縮の如き問題を有しないの
で特に好ましい。In the present invention, as the filler 5, a mixture of a hydrophobic material and a water-absorbing material as a base is used. As the hydrophobic material, for example, those used as fillers for water-shielded optical fiber cables similar to those of the present invention, and various materials that can perform similar functions can be used. For example, U.S. Whitco's packing Φ5B and many greases, such as polyurea grease, lithium stone grease, calcium stone grease, aluminum stone grease, benton grease, composite aluminum stone grease, composite Cal/lambstone grease, etc. can be exemplified. Among these, the worked penetration at room temperature measured by ASTM D-217 is 85 to 475, preferably 150 to 450, especially 200.
~400 greases enable filling work at room temperature,
This is especially preferable since it is easy to cool and does not cause problems such as volumetric shrinkage.
本発明において用いる吸水性物は、万一、遮水層３の内
側に水が浸入したとき、この水を自ら吸収して走水を防
止し得る作用をなす。従って、か＼る作用をなし得る材
料は、その化学種や化学構造に無関係に種々の有機又は
無機のものが用いられる。たとえば、アクリル酸変性デ
ンプンなどのデンプン−クラフト重合体、セルロースグ
ラフト重合体、カルボキンメチルセルロース、アクリル
酸重合体などの有機吸水性物類、シリカゲル、生石灰な
どの無機吸水性物類などが例示できる。The water-absorbing material used in the present invention functions to absorb water by itself and prevent water running if water should infiltrate inside the water-blocking layer 3. Therefore, various organic or inorganic materials can be used as materials capable of performing such actions, regardless of their chemical species or chemical structures. Examples include starch-kraft polymers such as acrylic acid-modified starch, organic water-absorbing substances such as cellulose graft polymers, carboquine methyl cellulose, and acrylic acid polymers, and inorganic water-absorbing substances such as silica gel and quicklime.
極く少量の吸収性物質の混合によって、走水防止能が大
幅に増大する。走水防止能の一層優れた組成物を得るた
めに吸収性物質の配合量は、疎水性物１００重量部あた
り、少なくとも１０重量部、特に少なくとも２０重量部
とするのが重量部あたり４００重量部以下、特に５００
重１部以下とするのが好ましい。更に、有機吸水性物の
多くは、吸水により体積膨張し、而して該物質を含む充
填用組成物の体積を膨張させて光ファイバに側圧を与え
て光ファイバの損失を増大させる危険があるので有機吸
水性物の配合量は、疎水性物１００重量部あたり２００
重量部以下、特に１００重量部以下とすることか一層好
ましい。Incorporation of very small amounts of absorbent material greatly increases the anti-hydrotactic ability. In order to obtain a composition with even better water running prevention ability, the amount of the absorbent substance to be blended is at least 10 parts by weight, particularly at least 20 parts by weight, per 100 parts by weight of the hydrophobic material, preferably 400 parts by weight. Below, especially 500
It is preferable that the weight is 1 part or less. Furthermore, many organic water-absorbing materials expand in volume due to water absorption, and there is a risk that the volume of the filling composition containing the material will expand, thereby applying lateral pressure to the optical fiber and increasing loss in the optical fiber. Therefore, the amount of organic water-absorbing material is 200 parts by weight per 100 parts by weight of hydrophobic material.
It is more preferable that the amount is less than 100 parts by weight, especially less than 100 parts by weight.
コア径５０μｍ、クラツド径１２５μ机のＧＩ形光ファ
イバ素線にナイロンジャケットを施した光フアイバ４８
本を有する付図の構造のアルミラミネート遮水層付き光
フアイバケーブル（外径２２咽）を製造した。Optical fiber 48 is a GI type optical fiber with a core diameter of 50 μm and a cladding diameter of 125 μm and a nylon jacket.
An optical fiber cable with an aluminum laminate water-blocking layer (outer diameter 22 mm) having the structure shown in the attached diagram was manufactured.
下表には、上記ケーブルの製造の際に用いた充填物の組
成、走水防止性能、並びに走水防止性能試験后における
光ファイバの０．８５μｍ帯での平均損失増加量を示す
。なお、上記走水防止性能は、長さ２−のケーブル試験
片の両端における縦添え遣水層と光ファイバユニット束
最外表面との間を防水パテにて充分に防水処理し、ケー
ブル試験片のはソ中央のシース並びに縦添え遮水層を２
５＋ｉｎにわたってはぎとり、そこに１０００１１Ｉ＋
１１の高さに水を満したポリエチレン管を設けて１４日
後におけ中央部からの透水が８５０■以上であるか否か
を調べる。The table below shows the composition of the filler used in manufacturing the cable, the water running prevention performance, and the average loss increase in the 0.85 μm band of the optical fiber after the water running prevention performance test. The water running prevention performance described above was achieved by fully waterproofing the space between the vertically attached water layer at both ends of a 2-length cable test piece and the outermost surface of the optical fiber unit bundle using waterproof putty. The center sheath and vertically attached waterproof layer are 2
Strip it over 5+in and add 100011I+ there.
A polyethylene pipe filled with water is installed at a height of 11, and after 14 days it is determined whether the water permeability from the center is 850 square meters or more.
付図は、本発明の実施例の断面図であって、１２は光フ
ァイバ、３は縦添え遮水層、５は走水防止用充填物であ
る。
特許出願人
大日日本電線株式会社
υ者懺輔役青山幸雄The attached figure is a cross-sectional view of an embodiment of the present invention, in which 12 is an optical fiber, 3 is a longitudinally attached water-blocking layer, and 5 is a filling for preventing water running. Patent applicant: Dainichi Nippon Electric Cable Co., Ltd. Yukio Aoyama
Claims (1)
して′なる遣水形光ファイバケーブルにおいて、上記走
水防止用充填物としてベースとなる疎水性物と吸水性物
とからなる混合物を用いることを特徴とする遮水形光フ
ァイバケーブル。 ２ 疎水性物質かＡＳＴＭ Ｄ−２１７で測定した常温
での混和ちょう度が８５〜４７５であり、吸水性物が有
機吸水性物であり、がっ、該有機吸水性物の量は疎水性
物質１００重量部あたり１ｏ〜２００重量部である特許
請求の範囲第１項の遣水形光ファイバケーブル。[Scope of Claims] 1. A water-sprayed optical fiber cable in which the space inside the water-shielding layer is filled with a water-running prevention filler, wherein the water-running prevention filler is a base hydrophobic material and A water-shielding optical fiber cable characterized by using a mixture consisting of a water-absorbing material. 2 The hydrophobic substance has a worked penetration of 85 to 475 at room temperature measured by ASTM D-217, and the water-absorbing material is an organic water-absorbing material, and the amount of the organic water-absorbing material is greater than that of the hydrophobic material. The water-sprayed optical fiber cable according to claim 1, wherein the content is 10 to 200 parts by weight per 100 parts by weight.
Priority Applications (9)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58147792A JPS6039609A (en) | 1983-08-11 | 1983-08-11 | Water shielding type optical fiber cable |
| AT84109498T ATE99424T1 (en) | 1983-08-11 | 1984-08-09 | WATERPROOF OPTICAL CABLE. |
| AU31763/84A AU571557B2 (en) | 1983-08-11 | 1984-08-09 | Waterproof optical fibre cable |
| DE3486260T DE3486260T2 (en) | 1983-08-11 | 1984-08-09 | Waterproof optical cable. |
| EP84109498A EP0137203B1 (en) | 1983-08-11 | 1984-08-09 | Waterproof optical fiber cable |
| KR1019840004788A KR920001218B1 (en) | 1983-08-11 | 1984-08-10 | Waterproof optical fiber cable |
| CA000460700A CA1250468A (en) | 1983-08-11 | 1984-08-10 | Waterproof optical fiber cable |
| US07/039,806 US4711523A (en) | 1983-08-11 | 1987-04-15 | Waterproof optical fiber cable |
| US07/967,122 USRE34732E (en) | 1983-08-11 | 1992-10-27 | Waterproof optical fiber cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58147792A JPS6039609A (en) | 1983-08-11 | 1983-08-11 | Water shielding type optical fiber cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6039609A true JPS6039609A (en) | 1985-03-01 |
Family
ID=15438309
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58147792A Pending JPS6039609A (en) | 1983-08-11 | 1983-08-11 | Water shielding type optical fiber cable |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6039609A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6217715A (en) * | 1985-07-17 | 1987-01-26 | Nippon Telegr & Teleph Corp <Ntt> | Waterproof type optical fiber cable |
| JPH0295004U (en) * | 1989-01-10 | 1990-07-27 | ||
| EP0601434A1 (en) * | 1992-12-08 | 1994-06-15 | Alcoa Fujikura Ltd. | Round, dry, all dielectric, fan out compact fiber cable |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51110676A (en) * | 1975-02-26 | 1976-09-30 | Northern Electric Co | |
| JPS538786A (en) * | 1976-06-14 | 1978-01-26 | Northern Telecom Ltd | Waterrpreventive electric cable |
| JPS5643610A (en) * | 1979-09-17 | 1981-04-22 | Nippon Telegr & Teleph Corp <Ntt> | Jelly filled optical fiber cable |
-
1983
- 1983-08-11 JP JP58147792A patent/JPS6039609A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51110676A (en) * | 1975-02-26 | 1976-09-30 | Northern Electric Co | |
| JPS538786A (en) * | 1976-06-14 | 1978-01-26 | Northern Telecom Ltd | Waterrpreventive electric cable |
| JPS5643610A (en) * | 1979-09-17 | 1981-04-22 | Nippon Telegr & Teleph Corp <Ntt> | Jelly filled optical fiber cable |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6217715A (en) * | 1985-07-17 | 1987-01-26 | Nippon Telegr & Teleph Corp <Ntt> | Waterproof type optical fiber cable |
| JPH0295004U (en) * | 1989-01-10 | 1990-07-27 | ||
| EP0601434A1 (en) * | 1992-12-08 | 1994-06-15 | Alcoa Fujikura Ltd. | Round, dry, all dielectric, fan out compact fiber cable |
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