JPH03109238A - Production of carbon coated optical fiber - Google Patents
Production of carbon coated optical fiberInfo
- Publication number
- JPH03109238A JPH03109238A JP1247515A JP24751589A JPH03109238A JP H03109238 A JPH03109238 A JP H03109238A JP 1247515 A JP1247515 A JP 1247515A JP 24751589 A JP24751589 A JP 24751589A JP H03109238 A JPH03109238 A JP H03109238A
- Authority
- JP
- Japan
- Prior art keywords
- carbon
- optical fiber
- glass fiber
- hydrocarbon
- inert gas
- 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
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 41
- 239000013307 optical fiber Substances 0.000 title claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 title claims description 10
- 229930195733 hydrocarbon Natural products 0.000 claims abstract description 30
- 150000002430 hydrocarbons Chemical class 0.000 claims abstract description 30
- 239000011261 inert gas Substances 0.000 claims abstract description 30
- 239000003365 glass fiber Substances 0.000 claims abstract description 29
- 239000004215 Carbon black (E152) Substances 0.000 claims abstract description 21
- 239000011248 coating agent Substances 0.000 claims abstract description 18
- 238000000576 coating method Methods 0.000 claims abstract description 18
- 238000000354 decomposition reaction Methods 0.000 claims abstract description 12
- 239000010409 thin film Substances 0.000 claims abstract description 8
- 239000000126 substance Substances 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 19
- 238000005979 thermal decomposition reaction Methods 0.000 claims description 6
- 125000000753 cycloalkyl group Chemical group 0.000 abstract description 5
- 239000000835 fiber Substances 0.000 abstract description 4
- 239000010408 film Substances 0.000 abstract description 3
- 239000008246 gaseous mixture Substances 0.000 abstract description 2
- 238000010438 heat treatment Methods 0.000 description 25
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 10
- 229910001873 dinitrogen Inorganic materials 0.000 description 10
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 239000001257 hydrogen Substances 0.000 description 6
- 229910052739 hydrogen Inorganic materials 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000010453 quartz Substances 0.000 description 6
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 4
- 235000011613 Pinus brutia Nutrition 0.000 description 4
- 241000018646 Pinus brutia Species 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 239000005416 organic matter Substances 0.000 description 3
- 229920002050 silicone resin Polymers 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 239000001307 helium Substances 0.000 description 2
- 229910052734 helium Inorganic materials 0.000 description 2
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 229910052754 neon Inorganic materials 0.000 description 2
- GKAOGPIIYCISHV-UHFFFAOYSA-N neon atom Chemical compound [Ne] GKAOGPIIYCISHV-UHFFFAOYSA-N 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 2
- 238000004544 sputter deposition Methods 0.000 description 2
- 238000002230 thermal chemical vapour deposition Methods 0.000 description 2
- CTQNGGLPUBDAKN-UHFFFAOYSA-N O-Xylene Chemical compound CC1=CC=CC=C1C CTQNGGLPUBDAKN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 125000002723 alicyclic group Chemical group 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 125000003118 aryl group Chemical group 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium oxide Inorganic materials O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- PVADDRMAFCOOPC-UHFFFAOYSA-N oxogermanium Chemical compound [Ge]=O PVADDRMAFCOOPC-UHFFFAOYSA-N 0.000 description 1
- 238000009864 tensile test Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 239000008096 xylene Substances 0.000 description 1
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明はカーボンコーティング光ファイバの製造方法に
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method of manufacturing a carbon coated optical fiber.
汎用の光ファイバは酸化ゲルマニウムでドープされた石
英ガラスから成るコアと、石英ガラスから成るクラッド
から構成されている。光ファイバの長期信顧性を確保す
るには耐水素特性（以下、耐Ｈ２特性と言う）が必要と
される。何故なら、光ファイバおよびケーブルのコーテ
イング材と金属材料、あるいはケーブル内の水分または
外から侵入してきた水と金属材料との反応で生じた水素
は、光フアイバ内に拡散し、伝送損失の増大を来す、光
ファイバのカーボンコーティングにより耐Ｈ２特性が改
良される。ことはＪｏｕｒｎａｌ ｏｆ Ｌｉｇｈｔ−
ｗａｖｅ Ｔｅｃｈｎｏｌｏｇｙ、 Ｖｏｌ、６＋ Ｎ
ｏ、２＋ ｐ、２４０（Ｆｅｂ、１９８８）およびＥｌ
ｅｃｔｒｏｎｉｃｓ Ｌｅｔｔｅｒｓ＋ Ｖｏｌ、２４
＋ Ｎｏ、２１゜ｐ、１３２３ （Ｏｃｔ、 １３ｔｈ
、 １９８８）に報告されている。A general-purpose optical fiber consists of a core made of quartz glass doped with germanium oxide and a cladding made of quartz glass. Hydrogen resistance (hereinafter referred to as H2 resistance) is required to ensure long-term reliability of optical fibers. This is because hydrogen generated by the reaction between the coating material of optical fibers and cables and the metal material, or the moisture inside the cable or the water that has entered from the outside and the metal material, diffuses into the optical fiber and increases transmission loss. The carbon coating of the optical fiber improves its H2 resistance. Kotoha Journal of Light-
wave Technology, Vol, 6+N
o, 2+ p, 240 (Feb, 1988) and El
electronics Letters+ Vol, 24
+ No, 21°p, 1323 (Oct, 13th
, 1988).
光ファイバの表面にカーボン薄膜をコーティングするに
は、プラズマＣＶＤ法、熱ｃｖＤ法、スパッタ法等があ
る。A plasma CVD method, a thermal CVD method, a sputtering method, etc. are available for coating the surface of an optical fiber with a carbon thin film.
またガラス母材から延伸したファイバを加熱炉内で移送
しながら、気体状有機物の高温熱分解により光ファイバ
の表面にカーボン薄膜を形成させる方法も試みられてい
る。Also, a method has been attempted in which a thin carbon film is formed on the surface of an optical fiber by high-temperature thermal decomposition of gaseous organic matter while the fiber drawn from a glass base material is transferred in a heating furnace.
〔発明が解決しようとする課題）
しかし上記プラズマＣＶＤ法、熱ＣＶＤ法、スパッタ法
等はいずれも光フアイバ製造工程の線引きライン上でカ
ーボンコーティングするのに適しておらず、効率よ〈実
施することができない。[Problems to be Solved by the Invention] However, none of the above-mentioned plasma CVD methods, thermal CVD methods, sputtering methods, etc. are suitable for carbon coating on the drawing line of the optical fiber manufacturing process, and it is difficult to implement them efficiently. I can't.
また加熱炉内で有機物の熱分解により光ファイバにカー
ボン薄膜をコーティングする方法は、厚さ方向に均一な
密度のカーボン薄膜を形成させることができず、伝達損
失の小さい光ファイバを得ることができなかった。また
カーボンコーティング光ファイバの初期強度が小さいこ
とがしばしばあった。これは、カーボンコーティングと
光ファイバの密着性の不足によると考えられる。Furthermore, the method of coating an optical fiber with a carbon thin film by thermal decomposition of organic matter in a heating furnace does not allow the formation of a carbon thin film with uniform density in the thickness direction, making it impossible to obtain an optical fiber with low transmission loss. There wasn't. Furthermore, the initial strength of carbon-coated optical fibers was often low. This is considered to be due to insufficient adhesion between the carbon coating and the optical fiber.
従って本発明の目的は、耐Ｈ２特性が良く、初期強度が
大きいカーボンコーティング光ファイバを効率よく製造
する方法を提供することにある。Therefore, an object of the present invention is to provide a method for efficiently manufacturing a carbon-coated optical fiber having good H2 resistance and high initial strength.
上記目的を達成するため、本発明では、ガラスファイバ
の表面に有機物の熱分解によりカーボン薄■りを形成さ
せてカーボンコーティングを施すカーボンコーティング
光ファイバの製造方法において、ガラスファイバを不活
性ガスの雰囲気中で加熱した後、気体状環式炭化水素と
不活性ガスとの混合気体に炭化水素の分解温度で接触さ
せるようにした。In order to achieve the above object, the present invention provides a method for manufacturing a carbon-coated optical fiber in which carbon coating is applied by forming a thin layer of carbon on the surface of a glass fiber by thermal decomposition of an organic substance. After heating in the reactor, it was brought into contact with a gas mixture of a gaseous cyclic hydrocarbon and an inert gas at the decomposition temperature of the hydrocarbon.
炭化水素の分解温度とは、炭化水素が分解されるに十分
な温度を意味し、炭化水素が分解される最低温度の意味
ではない。By decomposition temperature of a hydrocarbon is meant the temperature sufficient to decompose the hydrocarbon, not the lowest temperature at which the hydrocarbon decomposes.
本発明のカーボンコーティング光ファイバの製造方法は
、下記各過程から成る。The method for manufacturing a carbon coated optical fiber of the present invention consists of the following steps.
（１）ガラスファイバを不活性ガスの雰囲気中で加熱す
る過程
（２）ガラスファイバを炭化水素と不活性ガスとの混合
気体に炭化水素の分解温度で接触させる過程各過程につ
いて、以下に詳しく説明する。(1) Process of heating the glass fiber in an inert gas atmosphere (2) Process of bringing the glass fiber into contact with a gas mixture of hydrocarbons and inert gas at the hydrocarbon decomposition temperature Each process is explained in detail below. do.
（１）ガラスファイバを不活性ガスの雰囲気中で加熱す
る過程
本発明では、後述のように炭化水素の分解温度でガラス
ファイバに炭化水素と不活性ガスとの混合気体を接触さ
せる前に、不活性ガスの雰囲気中で加熱することを特徴
としている。(1) Process of heating the glass fiber in an inert gas atmosphere In the present invention, as described below, before contacting the glass fiber with a mixed gas of a hydrocarbon and an inert gas at the hydrocarbon decomposition temperature, an inert gas atmosphere is heated. It is characterized by heating in an atmosphere of active gas.
不活性ガスとして最も安価で簡便なものは窒素ガスであ
るが、アルゴンガス、ネオンガス、ヘリウムガス等を用
いてもよい。The cheapest and simplest inert gas is nitrogen gas, but argon gas, neon gas, helium gas, etc. may also be used.
ガラスファイバに接触する不活性ガスの気流の線速度は
、炭化水素の分解温度でガラスファイバに接触させる炭
化水素と不活性ガスとの混合気体の気流の線速度より大
きくすることが好ましく、通常約２倍から５０倍にする
のが適当である。The linear velocity of the inert gas stream that contacts the glass fiber is preferably greater than the linear velocity of the gas mixture of hydrocarbon and inert gas that is brought into contact with the glass fiber at the decomposition temperature of the hydrocarbon, and is usually about It is appropriate to increase the amount by 2 to 50 times.
（２）ガラスファイバに炭化水素と不活性ガスとの混合
気体を炭化水素の分解温度で接触させる過程有機物を高
温で熱分解させて光ファイバの表面にカーボンの薄膜を
形成させる過程である。光ファイバとなるガラスファイ
バに、熱分解してカーボンを容易に形成する気体状炭化
水素と不活性ガスとの混合気体を、例えば加熱炉内で炭
化水素の分解温度で接触させる。熱源としては電熱、燃
焼ガス等通常のものを用いることができる。(2) A process in which a mixed gas of a hydrocarbon and an inert gas is brought into contact with a glass fiber at the decomposition temperature of the hydrocarbon. This is a process in which organic matter is thermally decomposed at high temperatures to form a thin film of carbon on the surface of the optical fiber. A glass fiber that will become an optical fiber is brought into contact with a gaseous mixture of a gaseous hydrocarbon and an inert gas, which can be thermally decomposed to easily form carbon, at the decomposition temperature of the hydrocarbon, for example, in a heating furnace. As the heat source, ordinary heat sources such as electric heat and combustion gas can be used.
本発明では気体状環式炭化水素を不活性ガスとの混合気
体として用いることを、一つの特徴としている。環式炭
化水素は芳香族、脂環式いずれでもよいが、芳香族炭化
水素が望ましい。例えばベンゼン、トルエン、キシレン
等を用いることができる。One feature of the present invention is that a gaseous cyclic hydrocarbon is used as a gas mixture with an inert gas. The cyclic hydrocarbon may be either aromatic or alicyclic, but aromatic hydrocarbons are preferred. For example, benzene, toluene, xylene, etc. can be used.
不活性ガスとして最も安価で簡便なものは窒素ガスであ
るが、アルゴンガス、ネオンガス、ヘリウムガス等を用
いてもよい。The cheapest and simplest inert gas is nitrogen gas, but argon gas, neon gas, helium gas, etc. may also be used.
気体状炭化水素と不活性ガスとの混合気体を得るには、
常温または分解しない温度で液体状の炭化水素に不活性
ガスを吹き込み、炭化水素を気化させる方法を用いるこ
とができる。To obtain a mixture of gaseous hydrocarbons and inert gas,
A method can be used in which an inert gas is blown into liquid hydrocarbons at room temperature or at a temperature that does not decompose them, and the hydrocarbons are vaporized.
炭化水素と不活性ガスの混合比は、気休の体積比で約１
＝４から１＝１５程度が適当である。The mixing ratio of hydrocarbon and inert gas is approximately 1 by volume.
=4 to 1=15 is appropriate.
加熱炉を用いる場合、竪（たて）型であることが望まし
いが、垂直である必要はなく、傾斜していてもよい。加
熱炉として石英マツフルは好適である。When using a heating furnace, it is preferably vertical, but it does not have to be vertical and may be inclined. Quartz matzuru is suitable as a heating furnace.
上記二つの過程（１）および（２）は一つの加熱手段、
例えば加熱炉内で行われてもよい。すなわら、ガラス母
材から延伸したガラスファイバを長さ方向に移送する手
段を設け、ガラスファイバを長さ方向に移送しつつ、一
つの加熱炉内で、不活性ガスの雰囲気中で加熱し、さら
に炭化水素と不活性ガスとの混合気体に接触させて炭化
水素の熱分解により光ファイバの表面にカーボン薄膜を
形成させてもよい。例えば竪（たて）型の加熱炉を用い
加熱炉上部からガラスファイバを送り込む場合、加熱炉
上部に不活性ガスを供給し、加熱炉の中央部に炭化水素
と不活性ガスとの混合気体を供給すればよい。The above two processes (1) and (2) are performed using one heating means,
For example, it may be carried out in a heating furnace. In other words, a means for transporting the glass fiber drawn from the glass base material in the length direction is provided, and the glass fiber is heated in an inert gas atmosphere in one heating furnace while being transported in the length direction. Furthermore, a carbon thin film may be formed on the surface of the optical fiber by thermal decomposition of the hydrocarbon by bringing it into contact with a mixed gas of a hydrocarbon and an inert gas. For example, when using a vertical heating furnace and feeding the glass fiber from the top of the heating furnace, inert gas is supplied to the top of the heating furnace, and a mixed gas of hydrocarbon and inert gas is supplied to the center of the heating furnace. Just supply it.
本発明のカーボンコーティング光ファイバの製造方法に
おいては、ガラスファイバは不活性ガスの雰囲気中で加
熱された後、炭化水素の分解温度で炭化水素と不活性ガ
スとの混合気体に接触し、炭化水素の熱分解により生成
したカーボンが光ファイバの表面に薄膜を形成する。加
熱の初期においてガラスファイバの表面の温度はまだ低
いが、不活性ガスの雰囲気中にあるのでカーボンは付着
せず、ガラスファイバは炭化水素の分解温度まで加熱さ
れてから初めて炭化水素と不活性ガスとの混合気体に接
触し、カーボンが付着する。このために厚さ方向に均一
な密度のカーボンコーティングが形成される。もしガラ
スファイバが加熱初期に不活性ガス雰囲気中に置かれな
いか、不活性ガスの供給が不足であると、表面の温度が
まだ低いガラスファイバにカーボンが低い密度で付着し
、炭化水素の分解温度まで加熱された後に高い密度のカ
ーボンが付着するから、カーボンコーティングは厚さ方
向に不均一となる。その結果、十分な耐Ｈ２特性が得ら
れず、伝送損失が増大し、ファイバの破断強度が低下す
る。In the method for manufacturing a carbon-coated optical fiber of the present invention, the glass fiber is heated in an inert gas atmosphere, and then brought into contact with a gas mixture of hydrocarbons and inert gas at the decomposition temperature of hydrocarbons. Carbon produced by thermal decomposition forms a thin film on the surface of the optical fiber. At the beginning of heating, the surface temperature of the glass fiber is still low, but since it is in an inert gas atmosphere, carbon does not adhere to it, and only after the glass fiber is heated to the decomposition temperature of hydrocarbons, hydrocarbons and inert gas When it comes into contact with a gas mixture, carbon adheres to it. This results in the formation of a carbon coating with uniform density in the thickness direction. If the glass fiber is not placed in an inert gas atmosphere during the initial stage of heating, or if the supply of inert gas is insufficient, carbon will adhere at a low density to the glass fiber whose surface temperature is still low, resulting in the decomposition of hydrocarbons. The carbon coating is non-uniform through the thickness because of the high density of carbon that is deposited after being heated to that temperature. As a result, sufficient H2 resistance characteristics cannot be obtained, transmission loss increases, and fiber breaking strength decreases.
以下に実施例により本発明をさらに詳細に説明する。The present invention will be explained in more detail with reference to Examples below.
第１図に断面図を示す装置を用いてカーボンコーティン
グ光ファイバを製造した。第１回で、１は石英ガラス母
材、２は石英ガラスファイバ、３は延伸のための電気炉
、４は加熱炉、５は石英マツフル、６は窒素ガス供給口
、７は混合ガス供給口を示す。第１図に示すように、ま
ず、石英ガラス母材１ば電気炉３で２０００°Ｃに加熱
されてファイバに延伸される。延伸されたガラスファイ
バは加熱炉４内でその表面にカーボン薄膜が形成され、
コーティングカップ８ａと焼き付は炉９ａを通ってシリ
コーン樹脂コーティングされ、さらにコーティングカッ
プ８ｂと焼き付は炉９ｂを通ってナイロンコーティング
された。A carbon-coated optical fiber was manufactured using an apparatus whose cross-sectional view is shown in FIG. In the first session, 1 is a quartz glass base material, 2 is a quartz glass fiber, 3 is an electric furnace for drawing, 4 is a heating furnace, 5 is a quartz pine full, 6 is a nitrogen gas supply port, 7 is a mixed gas supply port shows. As shown in FIG. 1, first, a quartz glass base material 1 is heated to 2000° C. in an electric furnace 3 and drawn into a fiber. A thin carbon film is formed on the surface of the drawn glass fiber in the heating furnace 4.
The coating cup 8a and the baking cup passed through a furnace 9a to be coated with silicone resin, and the coating cup 8b and the baking cup passed through a furnace 9b to be coated with nylon.
加熱炉４内の温度は１２００℃とした。石英マツフル５
は外径２０ ｍｍ、内径１６ｍｍである。The temperature inside the heating furnace 4 was 1200°C. Quartz pine full 5
has an outer diameter of 20 mm and an inner diameter of 16 mm.
石英マツフル５の上部に設けた窒素ガス供給口６から窒
素ガスを流ｆｆｉ １０１ ／ ｍ ｉ ｎで供給した
。Nitrogen gas was supplied from a nitrogen gas supply port 6 provided at the top of the quartz pine full 5 at a flow rate ffi 101/min.
石英マツフル５の中央部に設けた混合ガス供給ロアから
は、３０℃に保ったベンゼン中にＱ、５１！、／ｍｉｎ
で吹き込んだ窒素ガス気流に３１！、／ｍｉｎの窒素ガ
スを加えた混合ガス流を供給した。窒素ガスと混合ガス
の流量の比は、これらのガスが円筒形のマツフルに供給
されるから、それぞれのガスの線速度の比に等しい。From the mixed gas supply lower installed in the center of the quartz Matsufuru 5, Q, 51! ,/min
31 to the nitrogen gas stream blown in! ,/min of nitrogen gas was supplied. The ratio of the flow rates of the nitrogen gas and the mixed gas is equal to the ratio of the linear velocities of each gas, since these gases are supplied to the cylindrical Matsufuru.
石英ガラスはプーリ１０により引き取られながら、５０
ｍ／ｍｉｎで線引き（延伸）され加熱炉に送り込まれた
。加熱炉４の設定温度は１２００°Ｃであるが、加熱炉
内上部でのガラスファイバの温度は約６００°Ｃ以下で
ある。While the quartz glass is being pulled by the pulley 10,
It was drawn (stretched) at a rate of m/min and sent into a heating furnace. Although the set temperature of the heating furnace 4 is 1200°C, the temperature of the glass fiber in the upper part of the heating furnace is about 600°C or less.
膜厚が０．０５μｍになるようカーボンコーティングを
施し、シリコーン樹脂コーティングされたシングルモー
ド光ファイバを、水素ガス中に温度１００°Ｃで１５時
間放置して耐水素試験を行った。その結果は第２図に示
す通りであった。第２図の縦軸は光伝送損失（ａＢ／ｋ
ｍ）を示す。A single mode optical fiber coated with carbon to a thickness of 0.05 μm and silicone resin was left in hydrogen gas at a temperature of 100° C. for 15 hours to conduct a hydrogen resistance test. The results were as shown in FIG. The vertical axis in Figure 2 is the optical transmission loss (aB/k
m).
またシリコーン樹脂コーティングの上に更にナイロンコ
ーティングした後、引張試験を行った。Further, a tensile test was conducted after further coating nylon on the silicone resin coating.
破断確率５０％での破断強度は７．９ｋｇであった。The breaking strength at a probability of breakage of 50% was 7.9 kg.
実施例１で窒素ガス流量を３ｆｆｉ／ｍｉｎに減少させ
た場合には、第２図に示すように耐水素試験で波長域１
．３および１．５５μｍでの損失が若干増え、拡散した
Ｈ２による波長１．２４μｍの吸収が目立ち、破断強度
も６．５ｋｇに減少した。部分的に破断強度が３ないし
４ｋｇの部分も認められた。これはおそらく光ファイバ
とカーボンコーティングの密着の低下によると思われる
。In Example 1, when the nitrogen gas flow rate was reduced to 3ffi/min, as shown in Figure 2, wavelength range 1 was obtained in the hydrogen resistance test.
．． The loss at wavelengths of 3 and 1.55 μm increased slightly, absorption at a wavelength of 1.24 μm due to diffused H2 was noticeable, and the breaking strength decreased to 6.5 kg. Some parts had a breaking strength of 3 to 4 kg. This is probably due to a decrease in the adhesion between the optical fiber and the carbon coating.
第２図には比較のため、カーボンコーティングを有しな
い汎用光ファイバの耐水素試験の結果も示した。For comparison, FIG. 2 also shows the results of a hydrogen resistance test of a general-purpose optical fiber without carbon coating.
〔発明の効果］
本発明の方法によると、耐Ｈ，特性が良く、初期強度が
大きいカーボンコーティング光ファイバを、効率よく製
造することができる。[Effects of the Invention] According to the method of the present invention, a carbon-coated optical fiber having good H resistance, characteristics, and high initial strength can be efficiently produced.
第１図は本発明の一実施例に用いた装置の略図、第２図
は本発明の実施例で得られたカーボンコーティング光フ
ァイバの耐水素試験の結果を示すグラフである。
符号の説明
１−・−・・−・石英ガラス母材
２−・・−・・・・・−石英ガラスファイバ３−・−・
−・−−一−−電気炉 ４・・・−・−・−・・
加熱炉５−・・・−・−・・石英マツフル ６・・−・
−・・−・−・・窒素ガス供給ロアー・−・−・−混合
ガス供給口
８ａ、８ｂ・・・・−・・・−・−コーティングカップ
９ａ、９ｂ−・・・・−・・−焼き付は炉１０−・−・
・プーリFIG. 1 is a schematic diagram of an apparatus used in an embodiment of the present invention, and FIG. 2 is a graph showing the results of a hydrogen resistance test of a carbon-coated optical fiber obtained in an embodiment of the present invention. Explanation of symbols 1--・--・-- Quartz glass base material 2---- Quartz glass fiber 3---
−・−−1−−Electric furnace 4・・・−・−・−・・
Heating furnace 5--...-- Quartz pine full 6...--
-・・−・−・・Nitrogen gas supply lower −・−・−Mixed gas supply ports 8a, 8b・・−・−・−Coating cup 9a, 9b−・・・−・・− Baking is done in the furnace 10-...
・Pulley
Claims (2)
ーボン薄膜を形成させてカーボンコーティングを施すカ
ーボンコーティング光ファイバの製造方法において、前
記ガラスファイバを不活性ガスの雰囲気中で加熱した後
、気体状環式炭化水素と不活性ガスとの混合気体に前記
炭化水素の分解温度で接触させることを特徴とする カーボンコーティング光ファイバの製造方法。(1) In a method for manufacturing a carbon-coated optical fiber, in which a carbon thin film is formed on the surface of a glass fiber by thermal decomposition of an organic substance and carbon coating is applied, the glass fiber is heated in an inert gas atmosphere, and then a gaseous ring is formed on the surface of the glass fiber. 1. A method for producing a carbon-coated optical fiber, comprising contacting a mixed gas of a hydrocarbon and an inert gas at a decomposition temperature of the hydrocarbon.
線速度が前記ガラスファイバに接触する前記混合気体の
線速度より大である請求項第１項のカーボンコーティン
グ光ファイバの製造方法。(2) The method for manufacturing a carbon-coated optical fiber according to claim 1, wherein the linear velocity of the inert gas in contact with the glass fiber is higher than the linear velocity of the mixed gas in contact with the glass fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1247515A JP2684789B2 (en) | 1989-09-22 | 1989-09-22 | Manufacturing method of carbon coated optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1247515A JP2684789B2 (en) | 1989-09-22 | 1989-09-22 | Manufacturing method of carbon coated optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03109238A true JPH03109238A (en) | 1991-05-09 |
| JP2684789B2 JP2684789B2 (en) | 1997-12-03 |
Family
ID=17164632
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1247515A Expired - Lifetime JP2684789B2 (en) | 1989-09-22 | 1989-09-22 | Manufacturing method of carbon coated optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2684789B2 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0227542A (en) * | 1988-07-18 | 1990-01-30 | Nippon Hoso Kyokai <Nhk> | Method and device for x-ray recording and reproducing |
| JPH0274542A (en) * | 1988-04-07 | 1990-03-14 | Sumitomo Electric Ind Ltd | Optical fiber coater |
| JPH02149450A (en) * | 1988-12-01 | 1990-06-08 | Fujikura Ltd | Production of optical fiber |
-
1989
- 1989-09-22 JP JP1247515A patent/JP2684789B2/en not_active Expired - Lifetime
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0274542A (en) * | 1988-04-07 | 1990-03-14 | Sumitomo Electric Ind Ltd | Optical fiber coater |
| JPH0227542A (en) * | 1988-07-18 | 1990-01-30 | Nippon Hoso Kyokai <Nhk> | Method and device for x-ray recording and reproducing |
| JPH02149450A (en) * | 1988-12-01 | 1990-06-08 | Fujikura Ltd | Production of optical fiber |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2684789B2 (en) | 1997-12-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0283240A (en) | Airtight sealed treated optical fiber | |
| JP2798486B2 (en) | Method and apparatus for producing hermetic coated optical fiber | |
| US3503798A (en) | Silicon nitride film deposition method | |
| US5037464A (en) | Method of cleaning and carbon coating optical fiber | |
| JPH03109238A (en) | Production of carbon coated optical fiber | |
| US3679475A (en) | Method for producing boron-carbon fibers | |
| JPH03109239A (en) | Production of carbon coated optical fiber | |
| US4294514A (en) | Light-wave guides and method of producing same | |
| CA1232569A (en) | Manufacture of optical fibre preforms | |
| JPS62279303A (en) | Production of optical waveguide layer | |
| JPH02160644A (en) | Production of optical fiber | |
| CN115613162B (en) | Composite fiber and preparation method thereof | |
| JPH0225853B2 (en) | ||
| JP3039975B2 (en) | Optical fiber manufacturing method | |
| JPH0235404A (en) | Optical fiber | |
| JPH02160642A (en) | Production of optical fiber | |
| JPH02149450A (en) | Production of optical fiber | |
| JPH03275535A (en) | Production of hermetically-coated optical fiber | |
| JP2581285B2 (en) | Manufacturing method of heat resistant optical fiber | |
| JPH0312345A (en) | Production of hermetically-coated optical fiber | |
| JP3039961B2 (en) | Optical fiber manufacturing method | |
| JP2798790B2 (en) | Optical fiber manufacturing method | |
| JPH0269339A (en) | Coating device for optical fiber | |
| JP2635430B2 (en) | Carbon film forming equipment | |
| JPH0273315A (en) | Optical fiber |