JPH089493B2 - Optical fiber manufacturing method - Google Patents
Optical fiber manufacturing methodInfo
- Publication number
- JPH089493B2 JPH089493B2 JP1052076A JP5207689A JPH089493B2 JP H089493 B2 JPH089493 B2 JP H089493B2 JP 1052076 A JP1052076 A JP 1052076A JP 5207689 A JP5207689 A JP 5207689A JP H089493 B2 JPH089493 B2 JP H089493B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- carbonized layer
- layer
- carbonized
- curable resin
- 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.)
- Expired - Fee Related
Links
- 239000013307 optical fiber Substances 0.000 title claims description 45
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 239000010410 layer Substances 0.000 claims description 24
- 239000011247 coating layer Substances 0.000 claims description 11
- 238000010438 heat treatment Methods 0.000 claims description 9
- 239000011347 resin Substances 0.000 claims description 9
- 229920005989 resin Polymers 0.000 claims description 9
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 238000003763 carbonization Methods 0.000 claims description 2
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000011248 coating agent Substances 0.000 description 9
- 238000000576 coating method Methods 0.000 description 9
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 238000010521 absorption reaction Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000001723 curing Methods 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910008051 Si-OH Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910006358 Si—OH Inorganic materials 0.000 description 1
- 238000003848 UV Light-Curing Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/104—Coating to obtain optical fibres
- C03C25/1065—Multiple coatings
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、耐水素特性を向上できる光ファイバの製造
法に関するものである。The present invention relates to a method for manufacturing an optical fiber capable of improving hydrogen resistance.
［従来の技術］ 石英ガラス系光ファイバはH2雰囲気においては、H2が
光ファイバ中に拡散混入する。その量はH2の分圧に依存
し、混入したH2により、伝送波長域である0.8〜1.7μｍ
に亘り、光ファイバは損失増加する。またH2は光ファイ
バ内のガラス欠陥と反応しSi−OHとなり、1.39μｍのOH
の吸収帯が増加し、その吸収帯のテールより、1.3μｍ
帯の損失が増加する。[Prior Art] In a silica glass optical fiber, H 2 diffuses and mixes into the optical fiber in an H 2 atmosphere. The amount depends on the partial pressure of H 2, the entrained H 2, a transmission wavelength region 0.8~1.7μm
The loss of the optical fiber increases. Also, H 2 reacts with glass defects in the optical fiber to become Si-OH, and OH of 1.39 μm
Absorption band increases, and 1.3 μm from the tail of the absorption band
Belt loss increases.
［発明が解決しようとする課題］ しかしながら、H2の発生はケーブル内の水分と金属材
料との反応またはコーティング材に含まれる微量のH2に
より、発生を完全に防ぐことができず、光ファイバの長
期安定性を保障するには、光ケーブル内に発生したH2が
光ファイバ内に拡散混合することを極力防ぐ必要があ
る。[Problems to be Solved] However, H 2 evolution is with H 2 traces contained in the reaction or coating material with moisture in the cable and the metal material can not be prevented from occurring completely optical fiber to the ensure long-term stability, it is as much as possible necessary to prevent the H 2 generated in the optical cable is diffused and mixed in the optical fiber.
本発明の目的は、前述した従来技術の欠点を解消し、
耐水素特性の良好な光ファイバの製造法を提供すること
にある。The object of the present invention is to eliminate the above-mentioned drawbacks of the prior art,
An object of the present invention is to provide a method for producing an optical fiber having excellent hydrogen resistance.
［課題を解決するための手段及び作用］ 本発明の要旨は、光ファイバ母材の先端から加熱延伸
した直後の前記光ファイバ素線の外周に、プレコーティ
ング或いはプライマリーコーティング用の第１の紫外線
硬化樹脂を塗布した後、該第１の紫外線硬化樹脂を紫外
線硬化することなく、酸素濃度が2000ppm以下の窒素ガ
スで満たされた前記加熱炉内に導いて炭素させて前記炭
化層を形成し、該炭化層の外周に、プライマリー或いは
セカンダリーコーティング用の第２の紫外線硬化樹脂か
らなる被覆層を施すことによりこれによって耐水素特性
を大巾に向上させたものである。[Means and Actions for Solving the Problem] The gist of the present invention is to provide a first ultraviolet curing for pre-coating or primary coating on the outer circumference of the optical fiber element wire immediately after being heated and drawn from the tip of the optical fiber preform. After applying the resin, without UV-curing the first UV-curable resin, it is introduced into the heating furnace filled with nitrogen gas having an oxygen concentration of 2000 ppm or less to cause carbonization to form the carbonized layer, By providing a coating layer made of a second ultraviolet curable resin for primary or secondary coating on the outer periphery of the carbonized layer, the hydrogen resistance is greatly improved by this.
［実施例］ 以下本発明の好適実施例を添付図面に基づいて説明す
る。[Embodiment] A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.
第１図において、先ず１は光ファイバ母材、２はカー
ボン抵抗炉、３はプレコートカップ、４は加熱装置、５
はプライマリーコーティングカップ、6a,6bは紫外線照
射装置、７ばセカンダリーコーティングカップ、８はタ
ーンプーリー、９は巻取機である。In FIG. 1, 1 is an optical fiber preform, 2 is a carbon resistance furnace, 3 is a precoat cup, 4 is a heating device, and 5 is a heating device.
Is a primary coating cup, 6a and 6b are ultraviolet irradiation devices, 7 is a secondary coating cup, 8 is a turn pulley, and 9 is a winder.
さて、1.3μｍ帯シングルモード光ファイバ母材１は
カーボン抵抗炉２で加熱、延伸し、光ファイバ素線11と
される。この光ファイバ素線11は、外径測定装置10でそ
の外径が125μm,線引速度が60m/minとなるよう加熱温度
及び巻取機９での巻取速度が調整される。The 1.3 μm band single mode optical fiber preform 1 is heated and stretched in the carbon resistance furnace 2 to form the optical fiber strand 11. The heating temperature and the winding speed of the winder 9 of the optical fiber strand 11 are adjusted by the outer diameter measuring device 10 so that the outer diameter is 125 μm and the drawing speed is 60 m / min.
この光ファイバ素線11は、紫外線硬化樹脂を入れたプ
レコートカップ３を通過すると、その表面にプレコーテ
ィングがなされ、次いで850℃の加熱装置４に入る。加
熱装置４は、N2パージされ、O2含有量は2000ppm以下に
保持され、そこでプレコーティングされた紫外線硬化樹
脂は炭化され、約１μｍの炭化層が形成される。When this optical fiber strand 11 passes through the precoat cup 3 containing the ultraviolet curable resin, its surface is precoated and then enters the heating device 4 at 850 ° C. The heating device 4 is purged with N 2 and the O 2 content is kept at 2000 ppm or less, where the pre-coated UV curable resin is carbonized to form a carbonized layer of about 1 μm.
次に、この炭化層が形成された光ファイバ素線は、プ
ライマリコートカップ５を通過することで紫外線硬化樹
脂が施され、紫外線照射装置6a内で照射された紫外線で
硬化され、さらに同様セカンダリコートカップ７を通過
してセカンダリコートがなされた後、次の紫外線照射装
置6b内で硬化され、ターンプリー８を介して巻取機９に
取られる。Next, the optical fiber element wire on which the carbonized layer is formed is subjected to an ultraviolet curable resin by passing through the primary coat cup 5 and cured by the ultraviolet ray irradiated in the ultraviolet ray irradiation device 6a, and the secondary coat After passing through the cup 7 to form a secondary coat, the secondary coat is cured in the next ultraviolet ray irradiation device 6b and taken up by the winder 9 through the turn pulley 8.
以上のようにして巻き取られた光ファイバ素線は、第
２図に示すよう外径125μｍの光ファイバ素線11の外周
に約１μｍの炭化層12が形成され、更にその外周にプラ
イマリコーティング層13及びセカンダリコーティング層
14が形成され、外径250μｍのUV被覆光ファイバが得ら
れる。As shown in FIG. 2, the optical fiber element wire wound as described above has a carbonized layer 12 of about 1 μm formed on the outer circumference of an optical fiber element wire 11 having an outer diameter of 125 μm, and a primary coating layer on the outer circumference thereof. 13 and secondary coating layer
14 is formed, and a UV coated optical fiber having an outer diameter of 250 μm is obtained.
炭化層12を成形した被覆光ファイバの初期伝送損失は
波長1.3μｍにおいて0.37dB/kmあり、炭化層のない従来
のUV被覆光ファイバと同等であった。そこで、両者の被
覆光ファイバをH21気圧雰囲気に入れ、150℃で100hr処
理した。100hr後の損失増加量は炭化層12を形成した本
発明の被覆光ファイバは、波長1.3μｍで0.3dB/kmの増
加が認められたが、従来のものは1dB/kmとほぼ３倍大き
かった。これは炭化層がH2を吸着する作用を有している
ことが推定される。The initial transmission loss of the coated optical fiber formed with the carbonized layer 12 was 0.37 dB / km at a wavelength of 1.3 μm, which was equivalent to that of the conventional UV coated optical fiber having no carbonized layer. Therefore, both coated optical fibers were placed in an atmosphere of H 2 1 atmosphere and treated at 150 ° C. for 100 hours. In the coated optical fiber of the present invention in which the carbonized layer 12 was formed, an increase of 0.3 dB / km was observed at a wavelength of 1.3 μm after 100 hours, whereas the conventional optical fiber was 1 dB / km, which was almost three times as large. . It is presumed that this is because the carbonized layer has an action of adsorbing H 2 .
第３図、第４図は本発明の他の実施例を示す。 3 and 4 show another embodiment of the present invention.
本例においては、光ファイバ素線11にプレコーティン
グを行わず、光ファイバ素線11をプライマリーコートカ
ップ５を通してプライマリーコーティングを施した後、
紫外線照射装置6a内で硬化させ、この膜厚40μｍのプラ
イマリコーティング層を形成した光ファイバ素線11を加
熱装置７内を通し、そこで850℃に加熱して表面から約
２μｍ厚さの炭化層を形成する。次にセカンダリーカッ
プ７を通して、セカンダリーコーティングを施した後、
紫外線照射装置6b内で紫外線硬化させて被覆光ファイバ
を得た。In this example, the optical fiber strand 11 is not pre-coated, and the optical fiber strand 11 is primary-coated through the primary coat cup 5,
The optical fiber element wire 11 cured in the ultraviolet irradiation device 6a and having the primary coating layer of 40 μm thickness is passed through the heating device 7, where it is heated to 850 ° C. to form a carbonized layer of about 2 μm thickness from the surface. Form. Next, after applying the secondary coating through the secondary cup 7,
The coated optical fiber was obtained by ultraviolet curing in the ultraviolet irradiation device 6b.
この被覆光ファイバは、第４図に示すよう外径125μ
ｍの光ファイバ素線11の表面に膜厚約40μｍのプライマ
リコーティング層13が形成され、そのプライマリコーテ
ィング層13の外周に約２μｍ厚の炭化層12が形成され、
さらいその外周にセカンダリコーティング層14が形成さ
れ、全体として外径250μｍの被覆光ファイバとなる。This coated optical fiber has an outer diameter of 125μ as shown in Fig. 4.
A primary coating layer 13 having a thickness of about 40 μm is formed on the surface of the optical fiber element 11 having a thickness of m, and a carbonized layer 12 having a thickness of about 2 μm is formed on the outer periphery of the primary coating layer 13.
Further, the secondary coating layer 14 is formed on the outer periphery thereof to form a coated optical fiber having an outer diameter of 250 μm as a whole.
炭化層を形成した被覆光ファイバの初期伝送損失は波
長1.3μｍにおいて、0.36dB/kmあり、炭化層のない従来
の被覆光ファイバと同等であった。２者の被覆ファイバ
をH21気圧に入れ、150℃で100hr処理した。100hr後の損
失増加量は炭化層を形成した被覆光ファイバは波長1.3
で0.5dB/KM増加し、従来のものは1dB/kmとほぼ２倍大き
く、炭化層がH2拡散を防ぐ働があることがわかる。これ
は炭化層がH2を吸着する作用を有していることが推定さ
れる。また1.39μｍのOH吸収帯の損失量も従来のものは
炭化層を有するものに比べ2.2倍増加した。The initial transmission loss of the coated optical fiber with a carbonized layer was 0.36 dB / km at a wavelength of 1.3 μm, which was equivalent to that of a conventional coated optical fiber without a carbonized layer. The coated fibers of the two were placed in H 2 1 atmosphere and treated at 150 ° C. for 100 hours. The loss increase after 100 hours is 1.3 at the wavelength of the coated optical fiber with a carbonized layer.
It increased by 0.5 dB / KM, and the conventional one was almost twice as large as 1 dB / km, indicating that the carbonized layer has a function of preventing H 2 diffusion. It is presumed that this is because the carbonized layer has an action of adsorbing H 2 . The loss in the 1.39 μm OH absorption band was also increased by 2.2 times compared to the conventional one having a carbonized layer.
［発明の効果］ 以上説明したように本発明によれば、プレコーティン
グ或いはプライマリーコーティングの表面に炭化層を形
成することで耐水素特性を向上でき、伝送損失増加の少
ない長期依頼性を有する光ファイバが得られる。[Effects of the Invention] As described above, according to the present invention, by forming a carbonized layer on the surface of the pre-coating or the primary coating, the hydrogen resistance can be improved, and the optical fiber having a long-term responsibility with little increase in transmission loss can be obtained. Is obtained.
第１図は本発明の方法を実施する装置の一例を示す図、
第２図は第１図の装置で製造された被覆光ファイバの詳
細断面図、第３図は本発明の他の実施例を示す図、第４
図は第３図において得られた被覆光ファイバの詳細断面
図である。 図中１は光ファイバ母材、３はプレコートカップ、４は
加熱装置、５はプライマリーコートカップ、11は光ファ
イバ素線、12は炭化層、13はプライマリコーティング
層、14はセカンダリコーティング層である。FIG. 1 is a diagram showing an example of an apparatus for carrying out the method of the present invention,
2 is a detailed sectional view of a coated optical fiber manufactured by the apparatus of FIG. 1, FIG. 3 is a view showing another embodiment of the present invention, and FIG.
The figure is a detailed sectional view of the coated optical fiber obtained in FIG. In the drawing, 1 is an optical fiber base material, 3 is a precoat cup, 4 is a heating device, 5 is a primary coat cup, 11 is an optical fiber element wire, 12 is a carbonized layer, 13 is a primary coating layer, and 14 is a secondary coating layer. .
Claims (1)
の光ファイバ素線外周に炭化層を形成し、該炭化層の外
周に被覆層を施す光ファイバの製造法において、加熱延
伸した直後の前記光ファイバ素線の外周に第１の紫外線
硬化樹脂を塗布した後、該第１の紫外線硬化樹脂を紫外
線硬化することなく、酸素濃度が2000ppm以下の窒素ガ
スで満たされた前記加熱炉内に導いて炭化させて前記炭
化層を形成し、該炭化層の外周に第２の紫外線硬化樹脂
からなる被覆層を施すことを特徴とする光ファイバの製
造法。1. A method for producing an optical fiber, wherein a carbonized layer is formed on the outer circumference of an optical fiber element wire immediately after the tip of an optical fiber preform is heated and drawn, and a coating layer is provided on the outer circumference of the carbonized layer. In the heating furnace filled with nitrogen gas having an oxygen concentration of 2000 ppm or less without applying ultraviolet curing to the first ultraviolet curable resin after applying a first ultraviolet curable resin to the outer circumference of the optical fiber element A method for producing an optical fiber, characterized in that the carbonized layer is formed by carbonization to form a carbonized layer, and a coating layer made of a second ultraviolet curable resin is applied to the outer periphery of the carbonized layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1052076A JPH089493B2 (en) | 1989-03-06 | 1989-03-06 | Optical fiber manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1052076A JPH089493B2 (en) | 1989-03-06 | 1989-03-06 | Optical fiber manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02233536A JPH02233536A (en) | 1990-09-17 |
| JPH089493B2 true JPH089493B2 (en) | 1996-01-31 |
Family
ID=12904729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1052076A Expired - Fee Related JPH089493B2 (en) | 1989-03-06 | 1989-03-06 | Optical fiber manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH089493B2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52121593A (en) * | 1976-04-01 | 1977-10-13 | Asahi Chemical Ind | Alkalline resistant glass fiber |
| JPH0646251B2 (en) * | 1985-05-22 | 1994-06-15 | 株式会社フジクラ | Light fiber |
-
1989
- 1989-03-06 JP JP1052076A patent/JPH089493B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH02233536A (en) | 1990-09-17 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR900003450B1 (en) | Preparation method for optical fiber | |
| US8452146B2 (en) | Process for manufacturing an optical fiber and an optical fiber so obtained | |
| US5092264A (en) | Apparatus for curing optical fiber coatings | |
| CA2077019C (en) | Optical glass fiber | |
| CN113292256A (en) | High-temperature-resistant and hydrogen-loss-resistant polyimide coating process for surface of optical fiber | |
| JP2635475B2 (en) | Optical fiber coating forming method | |
| US5945173A (en) | Method of making optical fiber ribbon | |
| JPH089493B2 (en) | Optical fiber manufacturing method | |
| GB2149392A (en) | Surface treatment of glass | |
| EP0157488A2 (en) | Optical fiber | |
| JPS587962B2 (en) | Hikari Eyever No Seizouhouhou | |
| JPH0225850B2 (en) | ||
| JP2003226559A (en) | Manufacturing method of optical fiber | |
| JPH06211545A (en) | Optical fiber coating method and apparatus | |
| JPS63129035A (en) | Production of optical fiber | |
| JP2679395B2 (en) | Manufacturing method of heat resistant optical fiber | |
| JP2004026615A (en) | Method and apparatus for manufacturing glass wire | |
| JPS60195039A (en) | Manufacture of optical fiber | |
| JP3960896B2 (en) | Optical fiber manufacturing method | |
| JPH01167264A (en) | Method for coating optical fiber | |
| JP3291062B2 (en) | Method for producing hermetic coated optical fiber | |
| JPH04224144A (en) | Manufacture of hermetically-coated fiber and its device thereof | |
| JP2968680B2 (en) | Optical fiber manufacturing method | |
| JPH10167770A (en) | Manufacturing method of carbon coated optical fiber | |
| JPH0717400B2 (en) | Optical fiber manufacturing method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |