JPS6057304A - Reinforced optical fiber unit - Google Patents
Reinforced optical fiber unitInfo
- Publication number
- JPS6057304A JPS6057304A JP58165736A JP16573683A JPS6057304A JP S6057304 A JPS6057304 A JP S6057304A JP 58165736 A JP58165736 A JP 58165736A JP 16573683 A JP16573683 A JP 16573683A JP S6057304 A JPS6057304 A JP S6057304A
- Authority
- JP
- Japan
- Prior art keywords
- fiber
- optical fiber
- layer
- reinforced
- protective coating
- 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.)
- Granted
Links
- 239000013307 optical fiber Substances 0.000 title claims abstract description 26
- 239000010410 layer Substances 0.000 claims abstract description 53
- 239000011253 protective coating Substances 0.000 claims abstract description 22
- 229920002430 Fibre-reinforced plastic Polymers 0.000 claims abstract description 15
- 239000011151 fibre-reinforced plastic Substances 0.000 claims abstract description 15
- 239000003365 glass fiber Substances 0.000 claims abstract description 7
- 239000002131 composite material Substances 0.000 claims description 8
- 239000000835 fiber Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000011241 protective layer Substances 0.000 claims description 3
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 claims description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 2
- 239000004917 carbon fiber Substances 0.000 claims description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims 1
- 239000002990 reinforced plastic Substances 0.000 claims 1
- 230000002787 reinforcement Effects 0.000 claims 1
- 239000011347 resin Substances 0.000 claims 1
- 229920005989 resin Polymers 0.000 claims 1
- 229920001187 thermosetting polymer Polymers 0.000 claims 1
- 229920002379 silicone rubber Polymers 0.000 abstract description 8
- 239000004945 silicone rubber Substances 0.000 abstract description 8
- 230000001681 protective effect Effects 0.000 abstract 2
- 239000000463 material Substances 0.000 description 10
- 230000003287 optical effect Effects 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 238000000465 moulding Methods 0.000 description 4
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 229910021536 Zeolite Inorganic materials 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000004927 clay Substances 0.000 description 1
- 229910052570 clay Inorganic materials 0.000 description 1
- HNPSIPDUKPIQMN-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Al]O[Al]=O HNPSIPDUKPIQMN-UHFFFAOYSA-N 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 229920001225 polyester resin Polymers 0.000 description 1
- 239000004645 polyester resin Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 239000010457 zeolite 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
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Abstract
Description
【発明の詳細な説明】
〔技術分野〕
本発明は光複合架空地線等に使用される高強度高耐熱性
を要求される光フアイバユニットにおいて、特に耐熱性
を大幅に改良する強化光フアイバユニットに関するもの
である。[Detailed Description of the Invention] [Technical Field] The present invention relates to optical fiber units that are used in optical composite overhead ground wires and the like and which require high strength and high heat resistance, and in particular to a reinforced optical fiber unit that significantly improves the heat resistance. It is related to.
近年、発電所と変電所間等の通信用として、電力送電線
用鉄塔間に架線される架空地線に、光ファイバを内蔵あ
るいは添架したいわゆる光複合架空地線が広く用いられ
るようになっている。このような光複合架空地線はその
使用上の性格から、特に雷の地絡時に発生ずる架空地線
の伸び、昇温に十分耐えるものでなければならない。こ
の場合架空地線の利質にもよるが５例えばアルモウェル
ドスチールを使用すると、地絡時の伸びは瞬時的に０．
５係以上にもなる。また送電線の送電容量によっても異
なるが送電線からの架空地線への電気的訪導により架空
地線は発熱し、例えば５０万ＫＶ程度の送電線網に設置
されている架空地線は無風時に最大電流が流れると１５
０℃になることもある。さらに、これに加えて雷が地絡
すると４００℃以上になるといわれている。それ故、架
空地線に内蔵または添架される光ファイバにも前記０．
５係以上の伸びに耐え得る機械強度と、前記１５０℃に
耐える耐熱性と、さらに雷の地絡時、送電遮断機が作動
するまでの０．７５秒秒間時温度約４００℃という高温
に耐え得る耐熱性とが要求される。この要求に対して、
従来から複数の光フアイバ心線を集合したものに緩衝保
護層を一体的に被覆し、該緩衝保護層の外側に繊維強化
プラスチックよりなる保護被覆層を設けたものが知られ
ている。In recent years, so-called optical composite overhead ground wires, in which optical fibers are built in or attached to overhead ground wires that are installed between power transmission towers, have become widely used for communication between power plants and substations. There is. Due to the nature of its use, such an optical composite overhead ground wire must be able to sufficiently withstand the elongation and temperature rise of the overhead ground wire that occurs particularly during lightning ground faults. In this case, depending on the quality of the overhead ground wire5, for example, if Almoweld steel is used, the elongation during a ground fault will be instantaneously 0.
There will be more than 5 sections. Although it also depends on the power transmission capacity of the transmission line, the overhead ground wire generates heat due to electrical conduction from the transmission line to the overhead ground wire. When the maximum current flows at 15
The temperature may drop to 0℃. Furthermore, it is said that when lightning causes a ground fault, temperatures can rise to over 400 degrees Celsius. Therefore, optical fibers built into or attached to the overhead ground wire also have the above 0.
It has mechanical strength that can withstand elongation of modulus 5 or higher, heat resistance that can withstand the above-mentioned 150°C, and can withstand high temperatures of approximately 400°C for 0.75 seconds until the power transmission breaker is activated in the event of a lightning ground fault. heat resistance is required. For this request,
BACKGROUND ART Conventionally, it has been known that a plurality of optical fiber core wires are integrally coated with a buffer protection layer, and a protective coating layer made of fiber-reinforced plastic is provided on the outside of the buffer protection layer.
ここで繊維強化プラスチックよりなる保護被覆層の下に
緩衝保護層を設ける理由は、前記繊維強化プラスチック
よりなる保護被覆層の被覆が引抜成形にて行われるため
である。すなわち前記緩衝保護層は、光ファイバが前記
引抜成形時に成形金型を通過する際受ける側圧がら該光
ファイバを保護するためにある。The reason why the buffer protection layer is provided below the protective coating layer made of fiber-reinforced plastic is that the protective coating layer made of fiber-reinforced plastic is coated by pultrusion. That is, the buffer protection layer is provided to protect the optical fiber from the lateral pressure applied when the optical fiber passes through a mold during the pultrusion molding.
ところで前記繊維強化プラスチックからなる保護被覆層
は、前述の機械的強度を満たすために、例えばガラス繊
維の場合、体積含有率で６０チ以上のガラス繊維を含有
している。この場合の母材を二股的に用いられているポ
リエステル樹脂やエポキシ樹脂とすると、前記保護被覆
層の径方向の線膨張係数は約１〜６ Ｘ １０−”／”
Ｃとなっている。一方この保護被覆層下の緩衝保護層の
径方向の線膨張係数は、例えば通常使用されるシリコー
ンゴムを用いたとすると、約１〜１０×１０／℃である
。ところが前記両者の径方向の線膨張係数の違いのため
次のような問題が生じている。By the way, in order to satisfy the above-mentioned mechanical strength, the protective coating layer made of the fiber-reinforced plastic contains, for example, 60 or more glass fibers in terms of volume content in the case of glass fibers. If the base material in this case is a bifurcated polyester resin or epoxy resin, the linear expansion coefficient in the radial direction of the protective coating layer is about 1 to 6 x 10-"/"
It is C. On the other hand, the coefficient of linear expansion in the radial direction of the buffer protection layer under this protective coating layer is about 1 to 10 x 10/°C, for example, if commonly used silicone rubber is used. However, the following problem arises due to the difference in linear expansion coefficient in the radial direction between the two.
前述の如く雷が地絡すると光複合架空地線全体が瞬時的
に約４００７Ｃもの高温になる。この時前記径方向の線
膨張係数の差により、線膨張係数の大きい内側の緩衝保
護層が膨張し外側の繊維強化プラスチックよりなる線膨
張係数の小さい保護被覆層に内側から圧力を加え、その
結果、前記保護被覆層のぜい弱部が繊維方向に割れ、そ
のため機械強度が著しく低下するという現象が起こる。As mentioned above, when lightning causes a ground fault, the entire optical composite overhead ground wire instantly becomes as hot as about 4007C. At this time, due to the difference in coefficient of linear expansion in the radial direction, the inner buffer protection layer with a larger coefficient of linear expansion expands, and pressure is applied from the inside to the outer protective coating layer made of fiber reinforced plastic with a smaller coefficient of linear expansion. A phenomenon occurs in which the weak parts of the protective coating layer crack in the fiber direction, resulting in a significant decrease in mechanical strength.
このように従来の光複合架空地線に用いられている光フ
アイバ集合体にあっては、機械強度の面や無風かつ最大
電流時的１５０”Ｃと０５温度には対応できるが瞬時約
４００”Ｃという温度には対応できない。In this way, the optical fiber aggregates used in conventional optical composite overhead ground wires have mechanical strength and can handle windless and maximum current temperatures of 150"C and 0.5C, but instantaneous temperatures of about 40"C. It cannot handle temperatures of C.
前記問題に鑑み、本発明の目的は、瞬時約４００℃とい
う高温下にあっても、繊維強化プラスチックからなる保
護被覆層が割れることのない耐熱性に優れた強化光フア
イバユニットを提供することにある。In view of the above-mentioned problems, an object of the present invention is to provide a reinforced optical fiber unit with excellent heat resistance, in which the protective coating layer made of fiber-reinforced plastic does not crack even under instantaneous high temperatures of about 400°C. be.
前記目的を達成すべく本発明の強化光フアイバユニット
は、最外層に緩衝層を有する光フアイバ心線を複数本集
合してなる集合体と、該集合体を断面はぼ円形状に一体
被覆してなる緩衝保護層と、該緩衝保護層の外側に設け
る繊維強化プラスチックよりなる保護被覆層とからなる
ものである。In order to achieve the above-mentioned object, the reinforced optical fiber unit of the present invention includes an aggregate formed by a plurality of optical fiber cores having a buffer layer on the outermost layer, and an integrally coated aggregate with a roughly circular cross section. It consists of a buffer protection layer made of a material, and a protective coating layer made of a fiber-reinforced plastic provided outside the buffer protection layer.
本発明の実施例を図を参照して詳細に述べる。 Embodiments of the present invention will be described in detail with reference to the drawings.
第１図は本発明の一実施例を示す断面図である。FIG. 1 is a sectional view showing one embodiment of the present invention.
第１図が示すように本発明の強化光フアイバユニットは
、最外層にシリコーンゴムよりなる緩衝層を有する光フ
アイバ心線１を複数本集合し、しかる後に前記集合体に
その断面がほぼ円形状になるようシリコーンゴム（ショ
ア硬度−１０〜６０）からなる緩衝保護層２を一体的に
被覆する。さらに前記緩衝保護層２の外側にシリコーン
ゴム（ショア硬度＝１０〜１００）を母材とし、ガラス
繊維を体積含有率で約６２チ含有し、前記緩衝保護層２
の径方向の線膨張係数とほぼ等しい径方向の線膨張係数
を有する繊維強化プラスチックを被覆し、保護被覆層３
とする。ここで光フアイバ心線１の最外層に設ける緩衝
層は前記光フアイバ心線ｌを複数本集合するときの側圧
や、この集合体に保護被覆層３を引抜成形により被覆す
るときの側圧を緩和する効果を有する。さてここで本発
明の特徴は前述のごとく前記保護被覆層３の径方向の線
膨張係数を前記緩衝保護層２の径方向の線膨張係数とほ
ぼ等しくしである点にある。因みに、本実施例では緩衝
保護層２の径方向の線膨張係数は１〜１０Ｘ １ ｏ−
’、／”ｃ、一方繊維強化プラスチックよりなる保護被
覆層３の径方向の線膨張係数は前記緩衝保護層２のそれ
とほぼ等しい約０．８〜３Ｘ１０−４／℃である。この
ように構成した本発明の強化光フアイバユニットを約４
００℃の炉中に直線状にして投入し、数秒後取り出して
みても外観に割れ、ひび等の異常はなんら見られない。As shown in FIG. 1, the reinforced optical fiber unit of the present invention collects a plurality of optical fiber core wires 1 having a buffer layer made of silicone rubber as the outermost layer, and then arranges the assembled optical fibers in a substantially circular cross section. A buffer protection layer 2 made of silicone rubber (Shore hardness -10 to 60) is integrally coated so as to have the following properties. Further, on the outside of the buffer protection layer 2, silicone rubber (Shore hardness = 10 to 100) is used as a base material, and glass fiber is contained in a volume content of about 62 cm, and the buffer protection layer 2
Protective coating layer 3
shall be. Here, the buffer layer provided on the outermost layer of the optical fiber core 1 relieves the lateral pressure when a plurality of the optical fiber cores 1 are assembled and the lateral pressure when the protective coating layer 3 is coated on this assembly by pultrusion molding. It has the effect of As mentioned above, the feature of the present invention is that the coefficient of linear expansion in the radial direction of the protective coating layer 3 is approximately equal to the coefficient of linear expansion in the radial direction of the buffer protection layer 2. Incidentally, in this example, the linear expansion coefficient in the radial direction of the buffer protection layer 2 is 1 to 10X 1 o-
', /'c, On the other hand, the coefficient of linear expansion in the radial direction of the protective coating layer 3 made of fiber-reinforced plastic is about 0.8 to 3X10-4/°C, which is approximately equal to that of the buffer protective layer 2. The reinforced optical fiber unit of the present invention is made of about 4
Even after putting it into a furnace at 00°C in a straight line and taking it out after a few seconds, there were no visible cracks or other abnormalities.
尚、前記実施例ではガラス繊維を含有する繊維強化プラ
スチックを用いたが、炭素繊維、アルミツド繊維、金属
線のいずれかでもよく、あるいはまたガラス繊維等前記
各繊維、金属線の複合体であってもよい。但し、各々の
含有率は母材を含めた機械強度及び線膨張係数を考慮し
て決定されねばならない。また前記繊維強化プラスチッ
クの被覆にあたっては引抜成形方法が用いられるが、こ
の方法においては母材となるプラスチックの粘度が引抜
加工性に大きく影響する。そこで最適引抜抵抗で引抜成
形を行うためには母材の粘度調整は重要である。この母
材の粘度調整用として予めアルミナ、タルク、炭酸カル
シウム、クレー、ゼオライト等の無機系微粒子を適量、
母材に配合しておくと前記引抜成形が容易となる。さら
に前記実施例では前記繊維強化プラスチックの母材とし
て、緩衝保護層２と同族のシリコーンゴムを用いている
が、前記母材は繊維強化プラスチックよりなる保護被覆
層３と緩衝保護層２の各径方向の線膨−張係数の関係さ
え満されておれば他の材料でもなんら問題ない。Although fiber-reinforced plastic containing glass fibers was used in the above embodiments, it may also be carbon fibers, aluminum fibers, metal wires, or a composite of each of the above-mentioned fibers, such as glass fibers, and metal wires. Good too. However, each content must be determined by taking into consideration the mechanical strength and linear expansion coefficient of the base material. Further, a pultrusion method is used to coat the fiber-reinforced plastic, but in this method, the viscosity of the plastic base material greatly affects the pultrusion processability. Therefore, it is important to adjust the viscosity of the base material in order to perform pultrusion molding with optimal drawing resistance. To adjust the viscosity of this base material, add an appropriate amount of inorganic fine particles such as alumina, talc, calcium carbonate, clay, and zeolite in advance.
If it is blended into the base material, the above-mentioned pultrusion molding will be facilitated. Further, in the above embodiment, silicone rubber of the same family as the buffer protection layer 2 is used as the base material of the fiber reinforced plastic; There is no problem with other materials as long as the relationship between linear expansion coefficient in the direction is satisfied.
以上に述べたように本発明の強化光フアイバユニットに
おいては、保護被覆層３の径方向の線膨張係数を緩衝保
護層２の径方向の線膨張係数とほぼ等しくしであるので
、雷の地絡時にあって約４００℃という高温にさらされ
ても、前記保護被覆層３がその繊維方向に割れたり、ひ
びが入ったりすることはない。しかもその機械強度はな
んら損われていない。As described above, in the reinforced optical fiber unit of the present invention, the coefficient of linear expansion in the radial direction of the protective coating layer 3 is approximately equal to the coefficient of linear expansion in the radial direction of the buffer protective layer 2. Even when exposed to a high temperature of about 400° C. during tangling, the protective coating layer 3 will not break or crack in the fiber direction. Moreover, its mechanical strength is not impaired in any way.
前記の如く、本発明の強化光フアイバユニットによれば
、瞬時約４００℃という高温下にあっても、繊維強化プ
ラスチックからなる保護被覆層がその繊維方向にき裂を
生ずることはない。As described above, according to the reinforced optical fiber unit of the present invention, the protective coating layer made of fiber-reinforced plastic does not crack in the direction of its fibers even under a high temperature of about 400° C. instantaneously.
それ故、高強度高耐熱性を必要とする光複合架空地線に
使用されても十分に対応でき得るものである。Therefore, it can be satisfactorily used in optical composite overhead ground wires that require high strength and high heat resistance.
第１図は本発明の一実施例を示す横断面図である。
■・光フアイバ心線、２・・緩衝保護層、３・・保護被
覆層。
第１図FIG. 1 is a cross-sectional view showing one embodiment of the present invention. ■・Optical fiber core wire, 2.・Buffer protection layer, 3.・Protective coating layer. Figure 1
Claims (3)
本集合してなる集合体と、該集合体を断面はぼ円形状に
一体被覆してなる緩衝保護層と、該緩衝保護層の外側に
設ける繊維強化プラスチックよりなる保護被覆層とから
なる強化光フアイバユニット。(1) An assembly made of a plurality of cored optical fibers having a buffer layer on the outermost layer, a buffer protection layer formed by integrally covering the assembly with a roughly circular cross section, and the buffer protection layer. A reinforced optical fiber unit consisting of a protective coating layer made of fiber-reinforced plastic provided on the outside.
径方向の線膨張係数は、前記緩衝保護層の径方向の線膨
張係数とほぼ等しいことを特徴とする特許請求の範囲第
１項記載の強化光フアイバユニット。(2) The reinforcement according to claim 1, wherein the radial linear expansion coefficient of the protective coating layer made of fiber-reinforced plastic is approximately equal to the radial linear expansion coefficient of the buffer protective layer. Fiber optic unit.
、アルミツド繊維、金属線のいずれかまたはこれらの複
合体を含む熱硬化性樹脂であることを特徴とする特許請
求の範囲第１項または第２項記載の強化光フアイバユニ
ット。(3) The reinforced plastic is a thermosetting resin containing any one of glass fiber, carbon fiber, aluminum fiber, metal wire, or a composite thereof. Reinforced fiber optic unit as described.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58165736A JPS6057304A (en) | 1983-09-08 | 1983-09-08 | Reinforced optical fiber unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58165736A JPS6057304A (en) | 1983-09-08 | 1983-09-08 | Reinforced optical fiber unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6057304A true JPS6057304A (en) | 1985-04-03 |
| JPH0130123B2 JPH0130123B2 (en) | 1989-06-16 |
Family
ID=15818097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58165736A Granted JPS6057304A (en) | 1983-09-08 | 1983-09-08 | Reinforced optical fiber unit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6057304A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004015475A2 (en) * | 2002-08-10 | 2004-02-19 | Emtelle Uk Limited | Optical cable for installation by blowing |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5811909A (en) * | 1981-07-16 | 1983-01-22 | Nippon Telegr & Teleph Corp <Ntt> | Nonmetallic optical cable unit |
-
1983
- 1983-09-08 JP JP58165736A patent/JPS6057304A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5811909A (en) * | 1981-07-16 | 1983-01-22 | Nippon Telegr & Teleph Corp <Ntt> | Nonmetallic optical cable unit |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004015475A2 (en) * | 2002-08-10 | 2004-02-19 | Emtelle Uk Limited | Optical cable for installation by blowing |
| WO2004015475A3 (en) * | 2002-08-10 | 2004-09-23 | Emtelle Uk Ltd | Optical cable for installation by blowing |
| EP1600801A3 (en) * | 2002-08-10 | 2006-05-31 | Emtelle UK Limited | Protective covering for optical fiber cable |
| US7136556B2 (en) | 2002-08-10 | 2006-11-14 | Emtelle Uk Limited | Signal transmitting cable |
| EP1821124A1 (en) * | 2002-08-10 | 2007-08-22 | Emtelle UK Limited | Signal transmitting cable |
| USRE41388E1 (en) | 2002-08-10 | 2010-06-22 | Emtelle Uk Limited | Signal transmitting cable |
| EP1600801B1 (en) | 2002-08-10 | 2016-04-13 | Emtelle UK Limited | Cable assembly with optical fibres for blowing installation |
| EP3073305A1 (en) * | 2002-08-10 | 2016-09-28 | Emtelle UK Limited | Cable assembly for transmitting optical signals |
| EP3073305B1 (en) | 2002-08-10 | 2017-08-02 | Emtelle UK Limited | Cable assembly for transmitting optical signals |
| EP3270203A1 (en) * | 2002-08-10 | 2018-01-17 | Emtelle UK Limited | Signal transmitting cable |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0130123B2 (en) | 1989-06-16 |
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