JPH02212328A - Production of optical fiber - Google Patents
Production of optical fiberInfo
- Publication number
- JPH02212328A JPH02212328A JP2986989A JP2986989A JPH02212328A JP H02212328 A JPH02212328 A JP H02212328A JP 2986989 A JP2986989 A JP 2986989A JP 2986989 A JP2986989 A JP 2986989A JP H02212328 A JPH02212328 A JP H02212328A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- outer diameter
- base material
- preform
- diameter
- 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 42
- 238000004519 manufacturing process Methods 0.000 title claims description 9
- 239000000463 material Substances 0.000 claims description 44
- 238000000034 method Methods 0.000 claims description 24
- 239000006185 dispersion Substances 0.000 description 9
- 239000000835 fiber Substances 0.000 description 7
- 239000007864 aqueous solution Substances 0.000 description 5
- 238000009826 distribution Methods 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 238000005530 etching Methods 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 239000010453 quartz Substances 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 4
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 239000001257 hydrogen Substances 0.000 description 3
- 229910052739 hydrogen Inorganic materials 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- RPAJSBKBKSSMLJ-DFWYDOINSA-N (2s)-2-aminopentanedioic acid;hydrochloride Chemical class Cl.OC(=O)[C@@H](N)CCC(O)=O RPAJSBKBKSSMLJ-DFWYDOINSA-N 0.000 description 2
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003365 glass fiber Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000001066 destructive effect Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004093 laser heating Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000001902 propagating effect Effects 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
- C03B37/01228—Removal of preform material
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01225—Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing
- C03B37/0124—Means for reducing the diameter of rods or tubes by drawing, e.g. for preform draw-down
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
- C03B37/01466—Means for changing or stabilising the diameter or form of tubes or rods
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、光ファイバ用母材の製造方法に関し、特に単
一モード光ファイバ用母材のコア径の厳密な制御方法に
関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for manufacturing an optical fiber preform, and particularly to a method for strictly controlling the core diameter of a single mode optical fiber preform.
光ファイバ、とくに単一モード光ファイバ（用母材）に
おいて所望のカットオフ波長や分散特性を得るためには
、コア径を所定の範囲内に制御する必要がある。中でも
、従来の長距離大容量光通信方式として実現が望まれて
いる光ソリトン方式では、使用波長における分散値を−
’ｌ ｐｓｅｃ／ｋｓ／ｎｍと仮定した際、分散値の制
御性は±０．５ ｐｓｅｃ／ｋｍ／ｎ−でも不十分であ
るとの報告がある（オプトロニクスＮ１１ｌ Ｏ，岡本
氏による「光ソリトン伝送」の論文第１１７−１２２頁
、１９８８年発行）。In order to obtain a desired cutoff wavelength and dispersion characteristics in an optical fiber, particularly a single mode optical fiber (base material), it is necessary to control the core diameter within a predetermined range. Among them, the optical soliton method, which is desired to be realized as a conventional long-distance, high-capacity optical communication method, has a dispersion value of -
It has been reported that the controllability of the dispersion value is insufficient even at ±0.5 psec/km/n- when assuming that the dispersion value is 'l psec/ks/nm. ” paper, pp. 117-122, published in 1988).
−船釣なステップ型屈折率分布を考慮すると、分散値の
制御性±０ 、 ５ ｐｓｅｃ八−へ鵬はコア径の制御
性に換算して概略±１％となる。この値は、通常の光フ
ァイバ用母材の製造方法でなしうる限界に近い値である
。- Considering the step-type refractive index distribution, the controllability of the dispersion value is approximately ±0, 5 psec, which is approximately ±1% in terms of the controllability of the core diameter. This value is close to the limit that can be achieved using a normal manufacturing method for optical fiber preforms.
一方、コア径の制ｉ１性を向上させる手段としては、例
えば、ジャーナル・オブ・ライトウェーブ・テクノロジ
イー；第ＬＴ−４巻、第７号、第８５８〜８６２頁に見
られるように、光ファイバ中央部に相当する光ファイバ
用母材を作製し、市販の石英パイプ内に挿入して線引す
る、謂ゆるロッドイン・チューブ法において、使用する
石英パイプの断面積を測定し、厳しく選別するという方
法がある。On the other hand, as a means to improve the controllability of the core diameter, for example, optical fiber In the so-called rod-in-tube method, in which a base material for optical fiber corresponding to the central part is made and inserted into a commercially available quartz pipe for drawing, the cross-sectional area of the quartz pipe to be used is measured and rigorously selected. There is a method.
しかしながら、後者のロッドイン・チューブ法では、石
英パイプ径の厳格な選別により使用できる石英管の数が
掻めて限られるため、コスト増をもたらすと共に、中心
部の光ファイバ母材の屈折率分布やコア径に長手方向の
変動があった場合には、全く対処ができない。However, in the latter rod-in-tube method, the number of quartz tubes that can be used is severely limited due to strict selection of the quartz tube diameter, resulting in increased costs and the refractive index distribution of the optical fiber base material in the center. If there is a change in the core diameter in the longitudinal direction, no measures can be taken at all.
本発明者らは、光ファイバ母材の線引加工による細線化
に際し、所定の外径／コア径の比を有しかつ外径が均一
な光フ、アイバ母材を得るには、予め母材の外周部を研
削加工し、次いで延伸加工を施すことが必須であること
を見出し、本発明を完成するに至った。The present inventors have discovered that when thinning an optical fiber preform by drawing, in order to obtain an optical fiber preform with a predetermined outer diameter/core diameter ratio and a uniform outer diameter, They discovered that it is essential to grind the outer periphery of the material and then stretch it, leading to the completion of the present invention.
従って、本発明は、上記課題を解決する手段として；
■光ファイバ用母材の外周部について、該光ファイバ用
母材の長手方向にわたって少なくとも一部を研削加工し
、外径を減少させ、次いで、外径が一定になるよう延伸
加工したのち、線引することを特徴とする、光ファイバ
の製造方法を提供するものである。Therefore, the present invention, as a means for solving the above-mentioned problems, includes; , provides a method for manufacturing an optical fiber, which is characterized in that the optical fiber is stretched to have a constant outer diameter and then drawn.
また、■研削加工後の光ファイバ母材表面の微細な凸凹
の平滑化のために、光ファイバ母材表面を予め腐蝕性溶
液でエツチング処理した後に、延伸加工、線引工程に付
する、光ファイバの製造方法である。In addition, in order to smooth out minute irregularities on the surface of the optical fiber base material after grinding, the surface of the optical fiber base material is etched in advance with a corrosive solution, and then subjected to the stretching and drawing process. This is a method of manufacturing fiber.
本発明を図面に基づいて詳細に説明する。The present invention will be explained in detail based on the drawings.
第１〜２図は、光ファイバ母材（以下、たんに母材とい
う）の外径／コア径を従来法（線引加工のみ・・−実線
部分）および本発明の方法（研削加工・延伸加工および
／又はエツチング加工＋線引加工・・・鎖線、−点ｖＡ
ＩＩｍ）を説明する、光ファイバ（母材）断面の拡大模
式図である。Figures 1 and 2 show the outer diameter/core diameter of the optical fiber base material (hereinafter simply referred to as the base material) by the conventional method (drawing only... - solid line) and the method of the present invention (grinding/drawing). Processing and/or etching + line drawing...chain line, - point vA
FIG. 2 is an enlarged schematic diagram of a cross section of an optical fiber (base material), explaining IIm).
例えば、外径１２５μｍΦに線引された状態で５．１ｕ
ｍΦのコア径を目標として光ファイバ用母材を作製した
時に、作製された母材の外径及びコア径が第１図（ａ）
〜（ｃ）に実線で示すように変動していたとする。この
ような母材をそのまま外径１２５μｍΦになるよう線引
すると、出来上がったファイバでは、通常には、第１図
（ｄ）に実線で示すようにコア径が目標値の５．ｌｔＩ
ｍ程度ずれるとともに、長手方向にもかなり変動する。For example, 5.1u when drawn with an outer diameter of 125μmΦ
When preparing an optical fiber preform with a core diameter of mΦ as the target, the outer diameter and core diameter of the prepared preform are as shown in Figure 1 (a).
Assume that the fluctuation is as shown by the solid line in ~(c). If such a base material is drawn as it is to have an outer diameter of 125 μmΦ, the resulting fiber usually has a core diameter of 5.0 μm, which is the target value, as shown by the solid line in FIG. 1(d). ltI
It deviates by about m and also fluctuates considerably in the longitudinal direction.
そこで、本発明においては、第１図（ａ）、（ｂ）に鎖
線で示すように、母材外径の変化が第１図（Ｃ）に示さ
れる母材でのコア径変動と一致するように、まず母材外
周部の少なくとも１部分をガラス繊維の加工に用いる公
知の研削手段、例えば回転研磨板、研磨塗粒付き研磨盤
などにより研削して、長手方向に均一な外径／コア径の
比率を有する母材に加工する。Therefore, in the present invention, as shown by the chain lines in FIGS. 1(a) and 1(b), the change in the outer diameter of the base material matches the core diameter variation in the base material shown in FIG. 1(C). First, at least a portion of the outer periphery of the base material is ground by a known grinding means used for processing glass fibers, such as a rotary grinding plate or a grinding wheel with abrasive particles, to obtain a uniform outer diameter/core in the longitudinal direction. Process into a base material with a diameter ratio.
一方、このように単に研削加工したままでは、外径は不
揃いで不均一な状態にあるから、後に線引工程で細線化
しても、前述のように外径制御が極めて困難になるため
、予め母材外径を均一にする必要がある。On the other hand, if the wire is simply ground like this, the outer diameter will be uneven and non-uniform, so even if the wire is thinned later in the wire drawing process, it will be extremely difficult to control the outer diameter as mentioned above. It is necessary to make the outer diameter of the base material uniform.
本発明の方法においては、ここで、さらに酸・水素バー
ナーなどのガラス繊維の加工に使用する任意の熱源によ
り母材を加熱し、適宜な伸長手段（巻き取り速度の制御
など）により延伸しつつ所定径にする点に特徴がある。In the method of the present invention, the base material is further heated by any heat source used for processing glass fibers, such as an acid/hydrogen burner, and stretched by an appropriate stretching means (controlling the winding speed, etc.). It is characterized by having a predetermined diameter.
なお、プリホームを加熱するための熱源としては、他に
レーザー加熱、誘導加熱、帯状加熱板などが用いうる。In addition, as a heat source for heating the preform, laser heating, induction heating, a belt-shaped heating plate, etc. can be used.
以上のように、本発明は、光ファイバの線引加工に先立
って、その母材の外径／コア径の比などの制御調整工程
を加えることによって、所定の外径／コア径の比を有し
、かつ外径が均一な光ファイバ用母材を得ることができ
る。As described above, the present invention provides a predetermined outer diameter/core diameter ratio by adding a process of controlling and adjusting the outer diameter/core diameter ratio of the base material prior to the drawing process of the optical fiber. It is possible to obtain an optical fiber preform having a uniform outer diameter.
また、母材の研削加工により母材表面の凹凸がひどい場
合には、そのまま加熱延伸してもミクロな凹凸を溶融平
滑化することは難しい、このような場合には、母材の研
削加工後、−旦母材を腐蝕性溶液、例えばＨＦなど弗酸
を主成分とする水溶液又は該水溶液に塩酸、硫酸などの
強酸の少量を混ぜた混酸水溶液中で母材表面のエツチン
グ処理を行うことが好ましい。In addition, if the surface of the base material is severely uneven due to grinding, it is difficult to melt and smooth out the microscopic irregularities even if the base material is heated and stretched. - Once the base material is etched in a corrosive solution, for example, an aqueous solution containing hydrofluoric acid as a main component such as HF, or a mixed acid aqueous solution in which a small amount of a strong acid such as hydrochloric acid or sulfuric acid is mixed with the aqueous solution, the surface of the base material can be etched. preferable.
このようにエツチング処理を行うことによって、母材表
面のミクロな凹凸をある程度平滑化することができ、従
ってさらにこの母材を酸素・水素炎などを用いる加熱延
伸加工をすると、より平滑な外表面の母材が得られる。By performing etching treatment in this way, microscopic irregularities on the surface of the base material can be smoothed to some extent, and therefore, if this base material is further heated and stretched using an oxygen or hydrogen flame, an even smoother outer surface can be obtained. The base material is obtained.
ここで、ｙａ！４！性溶液によるエツチング処理の条件
は、光ファイバ母材のガラス組成および研削加工後の表
面状態にも依存するが、一般には、例えばＨＦの１０％
水溶液中に１〜３時間程度浸漬することで十分である。Here, ya! 4! The conditions for etching treatment with a neutral solution depend on the glass composition of the optical fiber base material and the surface condition after grinding, but generally, for example, 10% of HF is used.
It is sufficient to immerse it in the aqueous solution for about 1 to 3 hours.
以上、第１図を用いて、光ファイバ母材外周部の研削を
正確にコア径の変動に一致させて行う場合について、本
発明の詳細な説明したが、第２図に一点鎖線で示すよう
に、本発明においては、概略コア径の変動に一致させて
研削加工を行っても、その後の加熱延伸加工と相まって
容品に所定のコア径の精度が得られる利点がある。Above, the present invention has been described in detail with reference to FIG. 1 in the case where the outer periphery of the optical fiber preform is ground accurately in accordance with the variation in the core diameter. Furthermore, in the present invention, there is an advantage that even if the grinding process is performed in accordance with the variation in the approximate core diameter, the precision of the predetermined core diameter can be obtained for the container in combination with the subsequent heating and stretching process.
本発明の光ファイバ母材の製造技術は、とくに光ソリト
ン（分散のある光ファイバを伝播しても、時間軸上のパ
ルス波形に変形歪みが生じない光波動）による大容量光
通信方式に用いる光ファイバ母材のコア径の精密設計に
好適に適用しうる。The manufacturing technology of the optical fiber preform of the present invention is particularly used in large-capacity optical communication systems using optical solitons (light waves that do not cause deformation or distortion in the pulse waveform on the time axis even when propagating through an optical fiber with dispersion). It can be suitably applied to precision design of the core diameter of an optical fiber preform.
本発明を実施例により具体的に説明するが、これは本発
明を範囲を制限するものでない。The present invention will be specifically explained by examples, but these are not intended to limit the scope of the present invention.
コアがＧｅａｒ ５ｉｆｔであって、クラッドがＦＳ
ｉＯｘの組成からなる、第３図に示す屈折率分布を有す
る外径約２５ｍΦ、長さ５００關の光ファイバ用母材を
２本〔母材Ａと母材Ｂ〕を作製した。The core is Gear 5ift and the cladding is FS
Two preforms for optical fibers (base material A and base material B) having an outer diameter of about 25 mΦ and a length of about 500 m and having a refractive index distribution shown in FIG. 3 and having a composition of iOx were prepared.
両母材について、５０ａｖａ間隔で全長にわたってコア
径と外径とを測定した結果を、第４図（母材Ａ）と第５
図（母材Ｂ）に示す０両母材ともに同程度のコア径、及
び外径の変動状態を示している。The results of measuring the core diameter and outer diameter over the entire length at intervals of 50 ava for both base materials are shown in Figures 4 (base material A) and 5.
Both base materials shown in the figure (base material B) show similar fluctuations in core diameter and outer diameter.
実施例
母材Ａについては、第４図の鎖線に示すように研削加工
により外径を調整した。その後、１０％ＨＦ水溶液に１
時間浸漬し、母材表面のＨＦエツチング処理を行ったの
ちに、外径２４．０Φになるよう酸・水素バーナーによ
る加熱延伸を行った。Regarding the Example base material A, the outer diameter was adjusted by grinding as shown by the chain line in FIG. Then, add 1 to 10% HF aqueous solution.
After being immersed for a period of time and performing HF etching treatment on the surface of the base material, it was heated and stretched using an acid/hydrogen burner so that the outer diameter was 24.0Φ.
さらに、この母材Ａを１２５μｍΦの外径に線引加工し
た。線引後、第４図にａ、ｂ、ｃ、ｄと示した母材の位
置に対応するようにファイバを４−ずつに分割し、１．
５５μｍでの分散値を測定した。その結果を表１に併せ
て示す。Furthermore, this base material A was wire-drawn to have an outer diameter of 125 μmΦ. After drawing, the fiber was divided into 4 pieces each corresponding to the positions of the base material indicated as a, b, c, and d in FIG.
The dispersion value at 55 μm was measured. The results are also shown in Table 1.
本発明の方法を適用した母材Ａにおいて、得られた４本
のファイバすべてが分散値＋２．０±０゜１ ｐｓｅｃ
／ｋｍ／ｎ−の範囲内にあり、本発明の方法の有効性を
示している。In base material A to which the method of the present invention is applied, all four fibers obtained have a dispersion value of +2.0±0°1 psec
/km/n-, demonstrating the effectiveness of the method of the present invention.
（比較例）
これに対して、この母材Ｂについては、そのまま１２５
ｐｍΦの外径に線引加工した。線引後、第５図にａ、ｂ
、ｃ、ｄと示した母材の位置に対応するようにファイバ
を４−ずつに分割し、１゜５５ｐｍでの分散値を測定し
た。その結果を表１に示す。(Comparative example) On the other hand, this base material B has 125
The wire was drawn to an outer diameter of pmΦ. After drawing, a and b are shown in Figure 5.
The fiber was divided into 4 pieces each corresponding to the positions of the base material shown as , c, and d, and the dispersion value at 1°55 pm was measured. The results are shown in Table 1.
分散値２ 、 ０ ｐｓｅｃ／ｋｓ八−±０ 、 ５
ｐｓｅｃ／ｌｖ／ｎｍを満足するものは１本（ａ）しか
なく、そのファイバにおいてもコア径が長手方向に変動
していることが判る。Variance value 2, 0 psec/ks8-±0, 5
There is only one fiber (a) that satisfies psec/lv/nm, and it can be seen that the core diameter of that fiber also varies in the longitudinal direction.
なお、本実施例（比較例）において、母材のコア径の測
定は、市販の非破壊屈折率分布測定装置（Ｙｏｒｋ社製
ＰＩＯＩ型）を使用した。In this example (comparative example), the core diameter of the base material was measured using a commercially available non-destructive refractive index distribution measuring device (PIOI type manufactured by York).
表１
〔発明の効果〕
以上に説明したように、本発明においては、光ファイバ
用母材の外周を研削加工したのち一定径に延伸加工する
ことにより、長手方向に均一かつ所定径のコア径を得る
ことができ、コア径のｉ密制御を要求される種類の光フ
ァイバの製造方法として効果的である。Table 1 [Effects of the Invention] As explained above, in the present invention, by grinding the outer periphery of the optical fiber base material and then stretching it to a constant diameter, the core diameter is uniform in the longitudinal direction and has a predetermined diameter. This method is effective as a method for manufacturing optical fibers that require close control of the core diameter.
第１〜２図は本発明の方法ならびに従来法による作用効
果を説明する、光ファイバ（母材）断面の拡大模式図で
ある。
第３図は、実施例に使用した光ファイバプリホームの屈
折率分布を概略的に示すグラフである。
第４図は、実施例（母材Ａ）の光ファイバプリホームの
長手方向の外径／コア径の実測結果を示すグラフである
。
第５図は、比較例（母材Ｂ）の光ファイバプリホームの
長手方向の外径／コア径の実測結果を示すグラフである
。FIGS. 1 and 2 are enlarged schematic diagrams of a cross section of an optical fiber (base material) for explaining the effects of the method of the present invention and the conventional method. FIG. 3 is a graph schematically showing the refractive index distribution of the optical fiber preform used in the example. FIG. 4 is a graph showing actual measurement results of the longitudinal outer diameter/core diameter of the optical fiber preform of Example (base material A). FIG. 5 is a graph showing actual measurement results of the longitudinal outer diameter/core diameter of the optical fiber preform of the comparative example (base material B).
Claims (2)
バ用母材の長手方向にわたって少なくとも一部分を研削
加工して外径を減少させ、次いで、外径が一定になるよ
う延伸加工した後、線引することを特徴とする、光ファ
イバの製造方法。(1) Regarding the outer circumference of the optical fiber preform, at least a portion thereof is ground in the longitudinal direction of the optical fiber preform to reduce the outer diameter, and then stretched so that the outer diameter is constant, A method of manufacturing an optical fiber, the method comprising drawing the optical fiber.
性溶液でエッチング処理した後に、延伸加工、線引工程
に付する請求項（１）記載の光ファイバの製造方法。(2) The method for manufacturing an optical fiber according to claim (1), wherein the surface of the optical fiber base material after grinding is etched in advance with a corrosive solution and then subjected to stretching and drawing steps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1029869A JP2652700B2 (en) | 1989-02-10 | 1989-02-10 | Optical fiber manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1029869A JP2652700B2 (en) | 1989-02-10 | 1989-02-10 | Optical fiber manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02212328A true JPH02212328A (en) | 1990-08-23 |
| JP2652700B2 JP2652700B2 (en) | 1997-09-10 |
Family
ID=12287978
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1029869A Expired - Lifetime JP2652700B2 (en) | 1989-02-10 | 1989-02-10 | Optical fiber manufacturing method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2652700B2 (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0878449A1 (en) * | 1997-05-13 | 1998-11-18 | Shin-Etsu Chemical Company, Ltd. | Method for making a preform for optical fibers by drawing a sintered preform boule |
| EP0976689A1 (en) * | 1998-07-29 | 2000-02-02 | Shin-Etsu Chemical Co., Ltd. | Process of producing a preform for an optical fibre and product produced by the process |
| EP1505039A3 (en) * | 2003-08-08 | 2005-05-04 | Sumitomo Electric Industries, Ltd. | Optical fiber preform, optical fiber, and manufacturing methods thereof |
| EP1595854A2 (en) * | 2001-04-06 | 2005-11-16 | Shin-Etsu Chemical Co., Ltd. | Preforms and optical fibres and methods of their manufacture |
| JP2019178030A (en) * | 2018-03-30 | 2019-10-17 | 古河電気工業株式会社 | Method for drawing core preform, method for manufacturing optical fiber preform and method for manufacturing optical fiber |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS569231A (en) * | 1979-06-28 | 1981-01-30 | Nippon Telegr & Teleph Corp <Ntt> | Manufacture of glass rod or pipe |
| JPS63139024A (en) * | 1986-08-08 | 1988-06-10 | Sumitomo Electric Ind Ltd | Production of optical fiber base material |
-
1989
- 1989-02-10 JP JP1029869A patent/JP2652700B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS569231A (en) * | 1979-06-28 | 1981-01-30 | Nippon Telegr & Teleph Corp <Ntt> | Manufacture of glass rod or pipe |
| JPS63139024A (en) * | 1986-08-08 | 1988-06-10 | Sumitomo Electric Ind Ltd | Production of optical fiber base material |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0878449A1 (en) * | 1997-05-13 | 1998-11-18 | Shin-Etsu Chemical Company, Ltd. | Method for making a preform for optical fibers by drawing a sintered preform boule |
| US6131414A (en) * | 1997-05-13 | 2000-10-17 | Shin-Etsu Chemical Co., Ltd. | Method for making a preform for optical fibers by drawing a mother ingot |
| EP0976689A1 (en) * | 1998-07-29 | 2000-02-02 | Shin-Etsu Chemical Co., Ltd. | Process of producing a preform for an optical fibre and product produced by the process |
| US6467310B2 (en) | 1998-07-29 | 2002-10-22 | Shin Etsu Chemical Co., Ltd. | Method for producing optical fiber base material ingot by grinding while core portion central axis is brought into line with rotational axis of grinding machine |
| EP1595854A2 (en) * | 2001-04-06 | 2005-11-16 | Shin-Etsu Chemical Co., Ltd. | Preforms and optical fibres and methods of their manufacture |
| EP1595854A3 (en) * | 2001-04-06 | 2007-05-16 | Shin-Etsu Chemical Co., Ltd. | Preforms and optical fibres and methods of their manufacture |
| US7698908B2 (en) | 2001-04-06 | 2010-04-20 | Shin-Etsu Chemical Co., Ltd. | Method of manufacturing a glass based material with defect removal |
| EP1505039A3 (en) * | 2003-08-08 | 2005-05-04 | Sumitomo Electric Industries, Ltd. | Optical fiber preform, optical fiber, and manufacturing methods thereof |
| JP2019178030A (en) * | 2018-03-30 | 2019-10-17 | 古河電気工業株式会社 | Method for drawing core preform, method for manufacturing optical fiber preform and method for manufacturing optical fiber |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2652700B2 (en) | 1997-09-10 |
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