JPH11109142A - Drawing method of optical fiber perform, drawing device therefor, and optical fiber perform - Google Patents
Drawing method of optical fiber perform, drawing device therefor, and optical fiber performInfo
- Publication number
- JPH11109142A JPH11109142A JP9269092A JP26909297A JPH11109142A JP H11109142 A JPH11109142 A JP H11109142A JP 9269092 A JP9269092 A JP 9269092A JP 26909297 A JP26909297 A JP 26909297A JP H11109142 A JPH11109142 A JP H11109142A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- fiber preform
- take
- rod
- core
- 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
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
- C03B37/0124—Means for reducing the diameter of rods or tubes by drawing, e.g. for preform draw-down
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Manufacture, Treatment Of Glass Fibers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光ファイバ母材の
延伸方法、その延伸装置、および延伸に適した光ファイ
バ母材に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for drawing an optical fiber preform, an apparatus for drawing the same, and an optical fiber preform suitable for drawing.
【０００２】[0002]
【従来の技術】近年、光ファイバ母材の製造技術の向上
によりかなり太い光ファイバ母材が製造できるようにな
り、このような太径の光ファイバ母材は伸線加工装置の
関係から、一旦、３５ｍｍφ程度の径のガラスロッドに
延伸加工したのち伸線加工される。そして前記太径の光
ファイバ母材は図５に示す方法により延伸加工される。
すなわち、図５に示す延伸方法は、上下スライド用レー
ル２１に取付けられた上チャック２２に７０ｍｍφ程度
の太径の光ファイバ母材（以下、単に光ファイバ母材と
称する）１１を取付け、上下スライド用レール２３に取
付けられた下チャック２４に引取棒（３５ｍｍφ程度）
１５を取付け、前記上チャック２２に把持される光ファ
イバ母材１１と前記下チャック２４に把持される引取棒
１５をそれぞれ上下から接近させ、双方の端面を電気加
熱式炉心管（図示せず）の最高温度域（１７００〜１９
００℃程度）で接触させ、融着させる。次いで、前記端
面同士が融着した光ファイバ母材１１と引取棒Ａとを、
それぞれ所定の速度ｕ、ｖ（ｕ＜ｖ）で下降させて光フ
ァイバ母材１１の下端部を順次細径化して伸線加工装置
に適合する径のガラスロッド１４とする。ガラスロッド
１４の仕上がり外径は、光ファイバ母材１１の下降速度
ｕを一定とし、外径測定器２８で測定したガラスロッド
１４の外径変化に応じて、引取棒Ａの下降速度ｖを変化
させて制御する。図５で、２９は加熱装置（誘導加熱
機）である。延伸の終了は、上チャック２２の下降を停
止し、下チャック２４のみを下降させて光ファイバ母材
１１を炉内最高温度域で切断して行う。2. Description of the Related Art In recent years, it has become possible to manufacture a considerably thick optical fiber preform due to the improvement of the optical fiber preform manufacturing technology. After drawing into a glass rod having a diameter of about 35 mmφ, it is drawn. The large-diameter optical fiber preform is stretched by the method shown in FIG.
That is, in the stretching method shown in FIG. 5, a large-diameter optical fiber preform (hereinafter, simply referred to as an optical fiber preform) 11 having a diameter of about 70 mm is attached to an upper chuck 22 attached to a vertical slide rail 21, and the vertical slide is performed. Pulling rod (about 35 mmφ) on the lower chuck 24 attached to the rail 23
The optical fiber preform 11 gripped by the upper chuck 22 and the pull rod 15 gripped by the lower chuck 24 are respectively approached from above and below, and both end faces are electrically heated core tubes (not shown). Temperature range (1700-19
(About 00 ° C.) and fused. Next, the optical fiber preform 11 having the end faces fused together and the take-off rod A are
The lower end of the optical fiber preform 11 is sequentially reduced in diameter at predetermined speeds u and v (u <v) to obtain a glass rod 14 having a diameter suitable for a wire drawing apparatus. The finished outer diameter of the glass rod 14 is set such that the lowering speed u of the optical fiber preform 11 is constant, and the lowering speed v of the take-off rod A changes according to the outer diameter change of the glass rod 14 measured by the outer diameter measuring device 28. Let control. In FIG. 5, reference numeral 29 denotes a heating device (induction heater). The end of the stretching is performed by stopping the lowering of the upper chuck 22 and lowering only the lower chuck 24 to cut the optical fiber preform 11 at the highest temperature range in the furnace.
【０００３】ところで、従来の光ファイバ母材は、図６
に示すように、ＧｅがドープされたＧｅＯ2-ＳｉＯ2 組
成のコア１２とその外周に形成されたＳｉＯ2 組成のク
ラッド層１３からなり、その先端はコア１２が突出して
形成されている。この光ファイバ母材１１を延伸する
際、その先端部分が炉心管内の最高温度域に到達する
と、コア１２はクラッド層１３より粘度が低いため光フ
ァイバ母材１１下端面から延び出して（図７）、引取
棒Ａ上端面にはコア１２のみが融着し（図７）、これ
を延伸するとコア１２は軟化点が低いため途中で千切れ
てしまうという問題がある（図７）。このため、図８
に示すように、光ファイバ母材１１のコア１２が延び出
した先端部を切断して、光ファイバ母材の先端面にクラ
ッド層を存在させ（図８）、この状態で融着させて
（図８）、延伸する（図８）方法が提案された。こ
のようにすると、図８に示したように、引取棒Ａの上端
面にはコア１２がクラッド層１３に囲包されて融着し、
延伸中にガラスロッド１４が千切れたりすることがなく
なる。A conventional optical fiber preform is shown in FIG.
As shown in FIG. 1, a core 12 of GeO 2 —SiO 2 composition doped with Ge and a clad layer 13 of SiO 2 composition formed on the outer periphery of the core 12 are formed at the tip of the core 12 so as to protrude. When the front end of the optical fiber preform 11 reaches the maximum temperature region in the furnace tube when the optical fiber preform 11 is drawn, the core 12 has lower viscosity than the cladding layer 13 and extends from the lower end face of the optical fiber preform 11 (FIG. 7). ), Only the core 12 is fused to the upper end surface of the take-off rod A (FIG. 7), and when it is stretched, the core 12 has a low softening point, so that there is a problem that the core 12 is cut off halfway (FIG. 7). Therefore, FIG.
As shown in (1), the leading end of the optical fiber preform 11 from which the core 12 extends is cut, and a cladding layer is present on the leading end surface of the optical fiber preform (FIG. 8), and fusion is performed in this state (FIG. 8). (FIG. 8), a method of stretching (FIG. 8) was proposed. As a result, as shown in FIG. 8, the core 12 is surrounded by the cladding layer 13 and fused to the upper end surface of the take-off rod A,
The glass rod 14 is not broken during stretching.
【０００４】[0004]
【発明が解決しようとする課題】しかし、前記の図８に
示した方法では、光ファイバ母材１１の先端部の切断を
作業者がダイヤモンドカッターを用いて手作業で行って
いるため、光ファイバ母材が汚染したり損傷したりし、
これが原因で後の工程で光ファイバが破断したり、光フ
ァイバの特性が低下したりする問題が起きる。また切断
という余分な工程が入るため生産性が低下するという問
題がある。本発明の目的は、光ファイバ母材と引取棒と
の融着を高品質にかつ効率良く行える光ファイバ母材の
延伸方法、その延伸装置、および前記融着が良好に行え
る光ファイバ母材を提供することにある。However, in the method shown in FIG. 8, the cutting of the tip of the optical fiber preform 11 is performed manually by a worker using a diamond cutter. The base material is contaminated or damaged,
This causes a problem that the optical fiber is broken in a later step or the characteristics of the optical fiber are deteriorated. Further, there is a problem that productivity is reduced due to an extra step of cutting. SUMMARY OF THE INVENTION An object of the present invention is to provide a method of stretching an optical fiber preform capable of performing high-quality and efficient fusion of an optical fiber preform and a take-off rod, a stretching apparatus thereof, and an optical fiber preform capable of performing the fusion well. To provide.
【０００５】[0005]
【課題を解決するための手段】請求項１記載の発明は、
加熱された炉心管内に、コアとクラッド層からなる光フ
ァイバ母材と引取棒とをそれぞれ上下から接近させて、
前記光ファイバ母材の下端面と引取棒の上端面とを前記
炉心管内で融着させたのち、前記光ファイバ母材と引取
棒とをそれぞれ所定の速度で下降させて光ファイバ母材
の下端部を順次細径化してガラスロッドとする光ファイ
バ母材の延伸方法において、前記光ファイバ母材の下端
面に引取棒Ａの上端面を融着させたのち、引取棒Ａを引
き離して除去し、次いで別の引取棒Ｂを上昇させ、その
上端面を前記光ファイバ母材下端面に融着させたのち、
前記光ファイバ母材と引取棒Ｂとをそれぞれ所定の速度
で下降させて光ファイバ母材の下端部を順次細径化して
ガラスロッドとすることを特徴とする光ファイバ母材の
延伸方法である。According to the first aspect of the present invention,
In the heated core tube, the optical fiber preform comprising the core and the cladding layer and the take-off rod are respectively approached from above and below,
After the lower end face of the optical fiber preform and the upper end face of the take-off rod are fused in the furnace tube, the optical fiber preform and the take-off rod are respectively lowered at a predetermined speed to lower the lower end of the optical fiber preform. In the method of drawing an optical fiber preform which is formed into a glass rod by sequentially reducing the diameter of the portion, after the upper end surface of the take-off rod A is fused to the lower end surface of the optical fiber preform, the take-off rod A is removed by being separated. Then, another take-up rod B is raised, and its upper end surface is fused to the lower end surface of the optical fiber preform.
An optical fiber preform stretching method, wherein the optical fiber preform and the take-off rod B are respectively lowered at a predetermined speed to gradually reduce the diameter of the lower end of the optical fiber preform to form a glass rod. .
【０００６】請求項２記載の発明は、上下スライド用レ
ールに上下動自在に取付けられた光ファイバ母材を把持
する上チャック、上下スライド用レールに上下動自在に
取付けられた引取棒Ａを把持する下チャック、前記上チ
ャックと下チャックにそれぞれ把持された光ファイバ母
材と引取棒Ａとの端面を融着し光ファイバ母材を延伸す
るための加熱用炉心管からなり、前記下チャックは水平
スライド用レール上に載置され、前記水平スライド用レ
ールの所定箇所には引取棒Ｂを把持した別の下チャック
が配置されていることを特徴とする光ファイバ母材の延
伸装置である。According to a second aspect of the present invention, there is provided an upper chuck for gripping an optical fiber preform which is vertically movably attached to a vertical slide rail, and a take-up rod A which is vertically movably attached to the vertical slide rail. A lower chuck, a heating furnace tube for fusing the end faces of the optical fiber preform and the take-off rod A held by the upper chuck and the lower chuck, respectively, and extending the optical fiber preform, wherein the lower chuck is An apparatus for stretching an optical fiber preform, which is placed on a horizontal slide rail, and another lower chuck holding a take-off bar B is disposed at a predetermined position of the horizontal slide rail.
【０００７】請求項３記載の発明は、加熱された炉心管
内に、コアとクラッド層からなる光ファイバ母材と引取
棒とをそれぞれ上下から接近させて、前記光ファイバ母
材の下端面と引取棒の上端面とを前記炉心管内で融着さ
せたのち、前記光ファイバ母材と引取棒とをそれぞれ所
定の速度で下降させて光ファイバ母材の下端部を順次細
径化してガラスロッドとする光ファイバ母材の延伸方法
において、前記光ファイバ母材の下端面がクラッド層で
覆われていることを特徴とする光ファイバ母材の延伸方
法である。According to a third aspect of the present invention, an optical fiber preform comprising a core and a cladding layer and a take-off rod are brought close to each other from above and below in a heated core tube, and the lower end face of the optical fiber preform is taken up. After fusing the upper end surface of the rod in the furnace tube, the optical fiber preform and the take-off rod are respectively lowered at a predetermined speed to sequentially reduce the diameter of the lower end of the optical fiber preform to form a glass rod. The method of stretching an optical fiber preform described above, wherein a lower end surface of the optical fiber preform is covered with a cladding layer.
【０００８】請求項４記載の発明は、コアとその周囲に
形成されたクラッド層からなり、少なくともその一端の
下端面がクラッド層で覆われていることを特徴とする光
ファイバ母材である。According to a fourth aspect of the present invention, there is provided an optical fiber preform comprising a core and a cladding layer formed around the core, wherein at least one lower end face of the core is covered with the cladding layer.
【０００９】[0009]
【発明の実施の形態】本発明方法を、図１〜を参照
して具体的に説明する。図１は、請求項１記載の発明方
法の第１の例を示す工程説明図である。この光ファイバ
母材の延伸方法は、光ファイバ母材１１と引取棒Ａとを
接近させた段階で、光ファイバ母材１１の軟化点の低い
コア１２がクラッド層１３より先に延び出し（図１
）、この光ファイバ母材１１と引取棒Ａとの端面同士
が融着（１回目の融着）すると、引取棒Ａ上端面にはコ
ア１２のみからなるガラスロッド１４が形成される（図
１）。ここで、光ファイバ母材１１の下降を止め、引
取棒Ａのみを下降させて、光ファイバ母材１１下端面か
ら引取棒Ａを引き離し（図１）、次いで前記光ファイ
バ母材１１下端面に別の引取棒Ｂの上端面を接触させて
（図１）２回目の融着を行い（図１）、融着後、こ
の引取棒Ｂを下降させて光ファイバ母材１１の下端部を
順次細径化してガラスロッド１４に加工する（図１
）。このように融着を２回に分けて行うと、２回目の
融着時には光ファイバ母材１１の下端面にはコア１２の
他にクラッド層１３が存在するため、ガラスロッド１４
は延伸初期からコア１２の外周にクラッド層１３が形成
された状態となり（図１参照）、ガラスロッド１４は
千切れることなく良好に延伸される。この発明方法によ
れば、光ファイバ母材１１の下端部を延伸装置の外に取
り出して切断しないため、光ファイバ母材１１の汚染や
損傷が防げる。また引取棒Ａ、Ｂの交換を自動的に行う
と、作業が効率良くなされ、光ファイバ母材１１を切断
する従来法に比べて生産性が向上する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The method of the present invention will be specifically described with reference to FIGS. FIG. 1 is a process explanatory view showing a first example of the method according to the first aspect of the present invention. In the method of stretching the optical fiber preform, the core 12 having a low softening point of the optical fiber preform 11 extends beyond the cladding layer 13 when the optical fiber preform 11 and the take-off rod A are brought close to each other (see FIG. 1
When the end faces of the optical fiber preform 11 and the pickup rod A are fused together (first fusion), a glass rod 14 consisting of only the core 12 is formed on the upper end face of the pickup rod A (FIG. 1). ). Here, the lowering of the optical fiber preform 11 is stopped, only the take-off rod A is lowered, and the take-off rod A is separated from the lower end face of the optical fiber preform 11 (FIG. 1). The upper end surface of another take-off rod B is brought into contact (FIG. 1) to perform a second fusion (FIG. 1), and after the fusion, the take-off rod B is lowered to sequentially lower the lower end of the optical fiber preform 11. The diameter is reduced and processed into a glass rod 14 (FIG. 1).
). If the fusion is performed twice in this manner, at the time of the second fusion, since the clad layer 13 exists in addition to the core 12 on the lower end surface of the optical fiber preform 11, the glass rod 14
Is in a state in which the cladding layer 13 is formed on the outer periphery of the core 12 from the initial stage of drawing (see FIG. 1), and the glass rod 14 is drawn well without breaking. According to the method of the present invention, the lower end portion of the optical fiber preform 11 is not taken out of the drawing device and cut, so that contamination and damage of the optical fiber preform 11 can be prevented. When the take-off bars A and B are automatically exchanged, the work is performed efficiently, and the productivity is improved as compared with the conventional method of cutting the optical fiber preform 11.
【００１０】図２は、前記請求項１記載の発明を実施す
る延伸装置の要部説明図である。この装置は、上下スラ
イド用レール２１に上下動自在に取付けられた光ファイ
バ母材１１把持用上チャック２２、上下スライド用レー
ル２３に連結した分岐レール２６に摺動自在に取付けら
れた２本の引取棒Ａ、Ｂを把持する２個の下チャック２
４、２７、上チャック２２に把持した光ファイバ母材１
１下端と下チャック２４、２７に把持した引取棒Ａ、Ｂ
上端とを熱融着するとともに光ファイバ母材を延伸する
加熱装置２９とからなる。さらに前記２個の下チャック
２４、２７を前記レール２６上を移動して自動的に交換
するための自動制御機（図示せず）が装備されている。
この装置では、光ファイバ下端部を延伸装置外で切断す
る代わりに、引取棒Ａ、Ｂを交換するので、光ファイバ
母材１１の汚染や損傷が防止され、また引取棒Ａ、Ｂの
交換を自動的に行うことにより生産性も殆ど阻害されな
い。FIG. 2 is an explanatory view of a main part of a stretching apparatus for carrying out the invention of the first aspect. This device comprises an upper chuck 22 for gripping the optical fiber preform 11 movably mounted on a vertical slide rail 21 and two slidably mounted branch arms 26 connected to a vertical slide rail 23. Two lower chucks 2 for gripping the pickup rods A and B
4, 27, optical fiber preform 1 held by upper chuck 22
1 Pulling bars A and B gripped by lower end and lower chucks 24 and 27
And a heating device 29 for thermally fusing the upper end and stretching the optical fiber preform. Further, an automatic controller (not shown) is provided for moving the two lower chucks 24 and 27 on the rail 26 and automatically exchanging them.
In this apparatus, instead of cutting the lower end of the optical fiber outside the drawing apparatus, the take-off rods A and B are exchanged, so that contamination and damage of the optical fiber preform 11 are prevented, and the exchange of the take-off rods A and B is performed. The productivity is hardly hindered by the automatic operation.
【００１１】図２は、１回目の融着後引取棒Ａを下降さ
せて引取棒Ａを光ファイバ母材１１から分離した状態を
示しており、こののち、引取棒Ａを下チャック２４ごと
スライドさせて上下スライド用レール２３から除去し、
そのあとへ別の引取棒Ｂを把持した下チャック２７を水
平スライド用レール２６上を移動させて上下スライド用
レール２３にセットし、この下チャック２７を上下スラ
イド用レール２３に沿って上昇させて引取棒Ｂの上端面
を光ファイバ母材１１の下端面に接触させ２回目の融着
を行い（図１参照）、以下、図１のように光ファイ
バ母材１１をガラスロッド１４に延伸する。この方法で
は、融着部分ににコア１２が含まれるため、延伸開始直
後のガラスロッド１４に±２ｍｍ程度の外径変動が生じ
る（図１参照）。FIG. 2 shows a state in which the take-off rod A is separated from the optical fiber preform 11 by lowering the take-off rod A after the first fusion, and thereafter, the take-off rod A is slid together with the lower chuck 24. And remove it from the vertical slide rail 23,
Thereafter, the lower chuck 27 holding another take-off rod B is moved on the horizontal slide rail 26 to be set on the vertical slide rail 23, and the lower chuck 27 is raised along the vertical slide rail 23. The upper end surface of the take-off rod B is brought into contact with the lower end surface of the optical fiber preform 11 to perform a second fusion (see FIG. 1), and thereafter, the optical fiber preform 11 is drawn into a glass rod 14 as shown in FIG. . In this method, since the core 12 is included in the fused portion, the outer diameter of the glass rod 14 fluctuates by about ± 2 mm immediately after the start of stretching (see FIG. 1).
【００１２】次に請求項３記載の発明を図３を参照して
説明する。図３は、請求項３記載の発明の延伸方法の例
を示す工程説明図である。光ファイバ母材３１は、下端
部がクラッド層１３で覆われ、下端面にコア（ＧｅＯ2-
ＳｉＯ2 ）１２が露出していない。この光ファイバ母材
３１と引取棒Ａとをそれぞれ上下から接近させ（図３
）、双方の端面を融着させたのち（図３）、光ファ
イバ母材３１と引取棒Ａとをそれぞれ所定の速度ｕ、ｖ
（但し、ｕ＜ｖ）で下降させて光ファイバ母材３１を延
伸させる（図３）。光ファイバ母材３１の融着部分は
引取棒Ａと軟化点が近いクラッド層１３のみからなるた
め延伸が初期から良好になされ、ガラスロッド１４が千
切れるようなことがない。この方法では延伸開始直後に
おいても、ガラスロッド１４の外径変動は±０．３ｍｍ
以内に抑えることができる。Next, the invention according to claim 3 will be described with reference to FIG. FIG. 3 is a process explanatory view showing an example of the stretching method according to the third aspect of the present invention. The optical fiber preform 31 has a lower end covered with the cladding layer 13 and a core (GeO 2 −) on the lower end.
SiO 2 ) 12 is not exposed. The optical fiber preform 31 and the take-off rod A are approached from above and below, respectively (FIG. 3).
After the two end faces are fused (FIG. 3), the optical fiber preform 31 and the take-off rod A are moved at predetermined speeds u and v, respectively.
The optical fiber preform 31 is stretched by lowering (where u <v) (FIG. 3). Since the fused portion of the optical fiber preform 31 is composed only of the take-off rod A and the cladding layer 13 having a softening point close to that of the optical fiber preform 31, the stretching is satisfactorily performed from the beginning, and the glass rod 14 is not broken. In this method, even immediately after the start of stretching, the outer diameter variation of the glass rod 14 is ± 0.3 mm.
Within.
【００１３】図４は、前記請求項３記載の発明にて用い
る本発明の光ファイバ母材の縦断面図である。この光フ
ァイバ母材３１は下端部がクラッド層１３で覆われてい
る。光ファイバ母材３１下端部のクラッド層１３の厚さ
ｔ（光ファイバ母材３１端部とコア１２端部との間隔）
は５ｍｍ程度あれば良い。この光ファイバ母材３１は、
通常行われているＶＡＤスート合成の終期にＧｅＣｌ4
（ドープ剤）の供給を停止することにより容易に製造す
ることができる。FIG. 4 is a longitudinal sectional view of the optical fiber preform of the present invention used in the third aspect of the present invention. The lower end of the optical fiber preform 31 is covered with the cladding layer 13. The thickness t of the cladding layer 13 at the lower end of the optical fiber preform 31 (the distance between the end of the optical fiber preform 31 and the end of the core 12)
Should be about 5 mm. This optical fiber preform 31
At the end of the usual VAD soot synthesis, GeCl 4
The production can be easily performed by stopping the supply of the (dopant).
【００１４】図１および図２に示した方法により製造し
たガラスロッドを光ファイバに伸線したが、高品質の光
ファイバが高歩留まりで製造された。また得られた光フ
ァイバを用いて布設した光通信システムでは良好な光通
信が行えた。The glass rod manufactured by the method shown in FIGS. 1 and 2 was drawn into an optical fiber, and a high-quality optical fiber was manufactured with a high yield. Further, in the optical communication system laid using the obtained optical fiber, good optical communication was performed.
【００１５】[0015]
【発明の効果】以上に述べたように、本発明方法では、
光ファイバ母材の下端部を延伸装置外で切断したりしな
いので、光ファイバ母材の汚染や損傷が防止され、高品
質の光ファイバが高歩留りで得られる。本発明の光ファ
イバ母材の延伸装置では光ファイバ母材の下端部の切断
を引取棒の交換により代替するので光ファイバ母材の汚
染や損傷が防止され、かつ引取棒を自動交換することに
より生産性は殆ど阻害されない。本発明の光ファイバ母
材によれば、引取棒との融着が良好に行えるので高品質
のガラスロッドが効率良く製造できる。依って、工業上
顕著な効果を奏する。As described above, according to the method of the present invention,
Since the lower end of the optical fiber preform is not cut outside the drawing device, contamination and damage of the optical fiber preform are prevented, and a high-quality optical fiber can be obtained at a high yield. In the optical fiber preform stretching apparatus of the present invention, the cutting of the lower end portion of the optical fiber preform is replaced by replacement of the take-off rod, so that the optical fiber preform is prevented from being contaminated or damaged, and the take-off rod is automatically replaced. Productivity is hardly hindered. According to the optical fiber preform of the present invention, high-quality glass rods can be efficiently manufactured because fusion with the take-off rod can be performed well. Therefore, an industrially remarkable effect is achieved.
【図１】本発明の光ファイバ母材の延伸方法の第１の例
を示す工程説明図である。FIG. 1 is a process explanatory view showing a first example of an optical fiber preform stretching method of the present invention.
【図２】図１に示した延伸方法を実施する装置の例を示
す要部説明図である。FIG. 2 is an explanatory view of a main part showing an example of an apparatus for performing the stretching method shown in FIG.
【図３】本発明の光ファイバ母材の延伸方法の第２の例
を示す工程説明図である。FIG. 3 is a process explanatory view showing a second example of the method for stretching an optical fiber preform of the present invention.
【図４】本発明の光ファイバ母材の例を示す縦断面説明
図である。FIG. 4 is an explanatory longitudinal sectional view showing an example of an optical fiber preform of the present invention.
【図５】従来の光ファイバ母材の延伸方法の工程説明図
である。FIG. 5 is a process explanatory view of a conventional optical fiber preform stretching method.
【図６】従来の光ファイバ母材の縦断面説明図である。FIG. 6 is an explanatory longitudinal sectional view of a conventional optical fiber preform.
【図７】従来の光ファイバ母材の延伸方法の工程説明図
である。FIG. 7 is a process explanatory view of a conventional optical fiber preform stretching method.
【図８】従来の光ファイバ母材の延伸方法の工程説明図
である。FIG. 8 is a process explanatory view of a conventional optical fiber preform stretching method.
１１、３１光ファイバ母材 １２ コア １３ クラッド層 １４ ガラスロッド １５ 引取棒 ２１ 上下スライド用レール ２２ 上チャック ２３ 上下スライド用レール ２４ 下チャック ２６ 分岐レール ２７ 下チャック ２８ ガラスロッドの外径測定器 ２９ 加熱装置 Ａ、Ｂ 引取棒 11, 31 Optical fiber preform 12 Core 13 Cladding layer 14 Glass rod 15 Pulling rod 21 Vertical slide rail 22 Upper chuck 23 Vertical slide rail 24 Lower chuck 26 Branch rail 27 Lower chuck 28 Glass rod outer diameter measuring device 29 Heating Equipment A, B Pickup rod
Claims (4)
層からなる光ファイバ母材と引取棒とをそれぞれ上下か
ら接近させて、前記光ファイバ母材の下端面と引取棒の
上端面とを前記炉心管内で融着させたのち、前記光ファ
イバ母材と引取棒とをそれぞれ所定の速度で下降させて
光ファイバ母材の下端部を順次細径化してガラスロッド
とする光ファイバ母材の延伸方法において、前記光ファ
イバ母材の下端面に引取棒Ａの上端面を融着させたの
ち、引取棒Ａを引き離して除去し、次いで別の引取棒Ｂ
を上昇させ、その上端面を前記光ファイバ母材下端面に
融着させたのち、前記光ファイバ母材と引取棒Ｂとをそ
れぞれ所定の速度で下降させて光ファイバ母材の下端部
を順次細径化してガラスロッドとすることを特徴とする
光ファイバ母材の延伸方法。An optical fiber preform comprising a core and a cladding layer and a take-off rod are respectively approached from above and below within a heated furnace core tube, and a lower end face of the optical fiber preform and an upper end face of the take-up rod are brought into contact with each other. After fusing in the furnace tube, the optical fiber preform and the take-off rod are respectively lowered at a predetermined speed, and the lower end portion of the optical fiber preform is sequentially reduced in diameter to form a glass rod. In the drawing method, after the upper end face of the take-off rod A is fused to the lower end face of the optical fiber preform, the take-off rod A is separated and removed, and then another take-up rod B is removed.
After the upper end surface is fused to the lower end surface of the optical fiber preform, the optical fiber preform and the take-off rod B are respectively lowered at a predetermined speed to sequentially lower the lower end of the optical fiber preform. A method of stretching an optical fiber preform, characterized in that the diameter is reduced to a glass rod.
付けられた光ファイバ母材把持用上チャック、上下スラ
イド用レールに連結した分岐レールに摺動自在に取付け
られた２本の引取棒を把持する２個の下チャック、前記
上チャックに把持した光ファイバ母材下端と下チャック
に把持した引取棒上端とを熱融着するとともに光ファイ
バ母材を延伸する加熱装置とからなることを特徴とする
光ファイバ母材の延伸装置。2. An optical fiber preform gripping upper chuck movably mounted on a vertical slide rail, and two pulling rods slidably mounted on a branch rail connected to the vertical slide rail. Two lower chucks, and a heating device that heat-fuses the lower end of the optical fiber preform held by the upper chuck and the upper end of the take-off rod held by the lower chuck and extends the optical fiber preform. Optical fiber preform stretching device.
層からなる光ファイバ母材と引取棒とをそれぞれ上下か
ら接近させて、前記光ファイバ母材の下端面と引取棒の
上端面とを前記炉心管内で融着させたのち、前記光ファ
イバ母材と引取棒とをそれぞれ所定の速度で下降させて
光ファイバ母材の下端部を順次細径化してガラスロッド
とする光ファイバ母材の延伸方法において、前記光ファ
イバ母材の下端面がクラッド層で覆われていることを特
徴とする光ファイバ母材の延伸方法。3. An optical fiber preform comprising a core and a cladding layer and a take-off rod are respectively approached from above and below in a heated core tube, and a lower end face of the optical fiber preform and an upper end face of the take-up rod are brought into contact with each other. After fusing in the furnace tube, the optical fiber preform and the take-off rod are respectively lowered at a predetermined speed, and the lower end portion of the optical fiber preform is sequentially reduced in diameter to form a glass rod. In the drawing method, a lower end surface of the optical fiber preform is covered with a cladding layer.
からなり、少なくともその一端の下端面がクラッド層で
覆われていることを特徴とする光ファイバ母材。4. An optical fiber preform comprising a core and a cladding layer formed around the core, wherein at least one lower end face is covered with the cladding layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26909297A JP4142133B2 (en) | 1997-10-02 | 1997-10-02 | Optical fiber preform stretching method and stretching apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26909297A JP4142133B2 (en) | 1997-10-02 | 1997-10-02 | Optical fiber preform stretching method and stretching apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11109142A true JPH11109142A (en) | 1999-04-23 |
| JP4142133B2 JP4142133B2 (en) | 2008-08-27 |
Family
ID=17467569
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26909297A Expired - Lifetime JP4142133B2 (en) | 1997-10-02 | 1997-10-02 | Optical fiber preform stretching method and stretching apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4142133B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004024643A1 (en) * | 2002-09-02 | 2004-03-25 | Heraeus Tenevo Ag | Method and device for vertically extruding a cylindrical glass body |
| US20200223737A1 (en) * | 2019-01-15 | 2020-07-16 | Heraeus Quartz North America Llc | Automated large outside diameter preform tipping process and resulting glass preforms |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR102080229B1 (en) * | 2018-05-14 | 2020-02-21 | (주)옵토네스트 | method of manufacturing optical fiber |
-
1997
- 1997-10-02 JP JP26909297A patent/JP4142133B2/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2004024643A1 (en) * | 2002-09-02 | 2004-03-25 | Heraeus Tenevo Ag | Method and device for vertically extruding a cylindrical glass body |
| US20200223737A1 (en) * | 2019-01-15 | 2020-07-16 | Heraeus Quartz North America Llc | Automated large outside diameter preform tipping process and resulting glass preforms |
| US11649185B2 (en) * | 2019-01-15 | 2023-05-16 | Heraeus Quartz North America Llc | Automated large outside diameter preform tipping process and resulting glass preforms |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4142133B2 (en) | 2008-08-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110668691B (en) | Processing device and processing method for prefabricated rod conical head | |
| EP0244135B1 (en) | Method of and apparatus for overcladding an optical preform rod | |
| CN111434633B (en) | Automated large outer diameter preform pointing process and resulting glass preform | |
| EP2351714B1 (en) | Method for manufacturing optical fiber preform | |
| US6779363B1 (en) | Method for pregobbing an optical fiber preform and system producing optical fiber therefrom | |
| JPH11109142A (en) | Drawing method of optical fiber perform, drawing device therefor, and optical fiber perform | |
| JP3489345B2 (en) | Optical fiber manufacturing method | |
| JP2003327440A (en) | Method for manufacturing preform for optical fiber | |
| JP4700893B2 (en) | Method and apparatus for changing shape of optical fiber preform drawing end | |
| JPH1087338A (en) | Drawing method | |
| CN114804612A (en) | Method and apparatus for elongating glass base material | |
| JP2014221691A (en) | Dummy rod integrated optical fiber preform and preparation method thereof | |
| GB2148874A (en) | Optical fibre fabrication by the rod-in-tube method | |
| JP3838846B2 (en) | Method for manufacturing preform for optical fiber | |
| JP3838850B2 (en) | Manufacturing method for optical fiber preform | |
| CN115403265B (en) | Optical fiber manufacturing system and manufacturing method | |
| JPS60155542A (en) | Method for molding fiber for optical communication | |
| JPH08310825A (en) | Method for working optical fiber preform | |
| JP3437484B2 (en) | Method and apparatus for manufacturing optical fiber preform | |
| JP2004043198A (en) | Method of cleaning optical fiber preform | |
| JP2004143016A (en) | Method for manufacturing optical fiber preform | |
| JP3824442B2 (en) | Optical fiber preform rod fusing device and fusing method | |
| JP3836298B2 (en) | Method for manufacturing preform for optical fiber | |
| JPH05150138A (en) | Production of optical fiber coupler | |
| JP2003212576A (en) | Method for elongating glass preform |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20040601 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20080125 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20080314 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20080603 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20080612 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110620 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110620 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120620 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120620 Year of fee payment: 4 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20130620 Year of fee payment: 5 |
|
| EXPY | Cancellation because of completion of term |