JPH05238769A - Production of polarization plane maintaining optical fiber - Google Patents

Production of polarization plane maintaining optical fiber

Info

Publication number
JPH05238769A
JPH05238769A JP4076015A JP7601592A JPH05238769A JP H05238769 A JPH05238769 A JP H05238769A JP 4076015 A JP4076015 A JP 4076015A JP 7601592 A JP7601592 A JP 7601592A JP H05238769 A JPH05238769 A JP H05238769A
Authority
JP
Japan
Prior art keywords
optical fiber
base material
section
core
maintaining optical
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.)
Pending
Application number
JP4076015A
Other languages
Japanese (ja)
Inventor
Hideya Morihira
英也 森平
Junichi Tamura
順一 田村
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Furukawa Electric Co Ltd
Original Assignee
Furukawa Electric Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Furukawa Electric Co Ltd filed Critical Furukawa Electric Co Ltd
Priority to JP4076015A priority Critical patent/JPH05238769A/en
Publication of JPH05238769A publication Critical patent/JPH05238769A/en
Pending legal-status Critical Current

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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
    • C03B37/0128—Manufacture of preforms for drawing fibres or filaments starting from pulverulent glass
    • 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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

PURPOSE:To easily and inexpensively obtain the above optical fiber having a long fiber length and stable quality by melting a specific base material and working the molten material to a nearly complete round section, then drawing the molten material in such a manner that the core part has an elliptic section. CONSTITUTION:The raw porous base material 1A (a) which has the core doped with Ge and a clad consisting of pure quartz and is so formed as to a have the nearly complete round section is obtd. This a component is then inserted into an optical fiber producing apparatus 7 and is pulled down in a blade 3 at 250<mm>/h speed, by which the surface layer of the component (a) is partly ground longitudinally and the section is formed nearly to the elliptic shape. The porous base 1B (b) having the core part and the clad part which is the porous body on the outer side is obtd. The (b) component is then pulled down in an electric furnace 5 and while this component is kept rotated, the component is brought into reaction with gaseous Cl, etc., by which the transparent glass base material (c) is obtd. The component is then melted to form the complete round section and the base material 1C (d) obtd. by forming the core part to the elliptic shape is drawn, by which the polarization plane maintaining optical fiber having the core of about 13<mm> major diameter and about 7mum minor diameter in the elliptic section is obtd.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は偏波面保存光ファイバの
製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing a polarization-maintaining optical fiber.

【０００２】[0002]

【従来の技術】単一モード光ファイバにおいて、コアと
その近傍を伝搬する二つの偏波モードを、光ファイバ内
のコアを楕円にするか、または、コアに不均一に歪をか
けることによって、各々独立に伝搬させることが可能と
なる。これが偏波面保存光ファイバであり、従来、偏波
面保存光ファイバの製造方法としては、主として下記に
述べる二つの製造方法が知られている。2. Description of the Related Art In a single-mode optical fiber, two polarization modes propagating in a core and its vicinity are elliptical in the optical fiber or non-uniformly distorted in the core. It is possible to propagate each independently. This is a polarization-maintaining optical fiber, and conventionally, the following two manufacturing methods are mainly known as methods for manufacturing a polarization-maintaining optical fiber.

【０００３】光ファイバ内のコアを楕円にする偏波面保
存光ファイバの製造方法は、図３に示すように、コア部
分２１０とクラッド部分２２０とを有しその断面が真円
に近い透明ガラス母材（プリフォーム）２００Ａの表面
層（クラッド面層）を（図３（Ａ）），その長手方向に
断面が楕円形のクラッド部分２２０となるように削り取
る（図３（Ｂ））。その後、加熱炉（図示せず）におい
てそのクラッド部分２２０の表面層の断面が真円になる
よう溶融し、真円になるクラッド部分２２３の溶融段階
の表面張力を用いてコア部分２１３を楕円にさせる（図
３（Ｃ））。しかる後、線引きして、図３（Ｄ）に示す
ように、信号伝送条件を満足する所定の断面積を有する
楕円形コア２１とクラッド２２を有する偏波面保存光フ
ァイバ２０を製造する。As shown in FIG. 3, a method of manufacturing a polarization-maintaining optical fiber in which an optical fiber has an elliptical core, as shown in FIG. 3, has a transparent glass matrix having a core portion 210 and a clad portion 220 whose cross section is close to a perfect circle. The surface layer (cladding surface layer) of the material (preform) 200A is cut (FIG. 3A) so as to form a clad portion 220 having an elliptical cross section in the longitudinal direction (FIG. 3B). After that, in a heating furnace (not shown), the cross-section of the surface layer of the cladding part 220 is melted into a perfect circle, and the core part 213 is formed into an ellipse by using the surface tension of the melting stage of the clad part 223 which becomes a perfect circle. (FIG. 3 (C)). After that, drawing is performed to manufacture a polarization-maintaining optical fiber 20 having an elliptical core 21 and a clad 22 having a predetermined cross-sectional area that satisfies the signal transmission condition, as shown in FIG.

【０００４】またコアに不均一に歪みをかける偏波面保
存光ファイバの製造方法は、図４に示すように、コア部
分３１０の近傍でクラッド部分３２０の内部にコア部分
３１０の線膨張係数よりも大きい線膨張係数のＳｉＯ2
−Ｂ2 Ｏ3 ガラス部３３１、３３２を２カ所配し、コア
部分３１０に両側から不均一な応力をかけるようにす
る。なお、図３の偏波面保存光ファイバと図４の偏波面
保存光ファイバとの寸法は一致していない。As shown in FIG. 4, a method of manufacturing a polarization-maintaining optical fiber in which a core is unevenly strained is shown in FIG. 4 in which a linear expansion coefficient of the core portion 310 is provided inside the cladding portion 320 in the vicinity of the core portion 310. SiO 2 with a large linear expansion coefficient
The -B 2 O 3 glass portions 331 and 332 disposed at two, so that applying a non-uniform stress from both sides on the core portion 310. The dimensions of the polarization-maintaining optical fiber of FIG. 3 and the polarization-maintaining optical fiber of FIG. 4 do not match.

【０００５】[0005]

【発明が解決しようとする課題】図３に示した偏波面保
存光ファイバの製造方法は、透明ガラス母材に形成後に
研削処理を行うが、透明ガラス母材が硬いので透明ガラ
ス母材の研削に非常に長い時間を要し、しかも、時々透
明ガラス母材にクラックが入るため、大型の線引用母材
を得ることが困難であり、長尺の偏波面保存光ファイバ
を製造することができないという問題に遭遇している。In the method of manufacturing the polarization-maintaining optical fiber shown in FIG. 3, the transparent glass base material is ground and then ground. However, since the transparent glass base material is hard, the transparent glass base material is ground. Takes a very long time, and sometimes the transparent glass base material is cracked, so it is difficult to obtain a large-size wire-quoting base material, and it is not possible to manufacture a long polarization-maintaining optical fiber. I am encountering the problem.

【０００６】図４に示した偏波面保存光ファイバの製造
方法は、コアに応力を付与するＳｉＯ2 −Ｂ2 Ｏ3 部３
３１、３３２を設けるため、透明ガラス母材３００の長
手方向に二つの穴をあけるという工程が必要となり、し
かも、その穴明け深さも加工精度の面から高々２０ｃｍ
程度が限界であった。したがって、この方法では大型の
線引用母材が得られず、最終的に製造される光ファイバ
としても高々、長さが１０ｋｍ程度が上限であり、長さ
の長い偏波面保存光ファイバを安価に製造することが困
難であるという問題に遭遇している。In the method of manufacturing the polarization-maintaining optical fiber shown in FIG. 4, the SiO 2 -B 2 O 3 part 3 for applying stress to the core is used.
In order to provide 31, 332, a process of making two holes in the longitudinal direction of the transparent glass base material 300 is required, and the depth of drilling is 20 cm at most from the viewpoint of processing accuracy.
The degree was the limit. Therefore, this method does not provide a large-sized wire-drawing base material, and the maximum length of the finally manufactured optical fiber is about 10 km. Therefore, a long-length polarization-maintaining optical fiber can be inexpensively manufactured. We have encountered the problem of being difficult to manufacture.

【０００７】[0007]

【課題を解決するための手段】本発明は上述した問題を
解決し、製造が容易で短時間に、太くかつ長い大型の偏
波面保存光ファイバ用母材を形成し、最終的に長さの長
い偏波面保存光ファイバを低価格で製造可能とすること
を目的としており、透明ガラス母材に形成する前の多孔
質母材（スート）の段階でクラッド部分を楕円形に研削
を行って、偏波面保存光ファイバを製造するために必要
とする形状のスートを形成する。この楕円形のクラッド
部分をもつ多孔質母材を加熱して溶融し、その外形断面
が再びほぼ真円になるようにし、その過程でコア部分を
楕円形にする。その後，最終的な偏波面保存光ファイバ
を製造するため、線引を行う。SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems and forms a large base material for a polarization-maintaining optical fiber which is easy to manufacture and is short in time, and has a long length. The purpose is to make it possible to manufacture a long polarization-maintaining optical fiber at a low price, by grinding the clad portion into an elliptical shape at the stage of the porous base material (soot) before forming it on the transparent glass base material, A soot having a shape required for manufacturing a polarization-maintaining optical fiber is formed. The porous base material having the elliptical clad portion is heated and melted so that the cross section of the outer shape becomes almost a perfect circle again, and the core portion is formed into an elliptical shape in the process. Then, in order to manufacture the final polarization-maintaining optical fiber, drawing is performed.

【０００８】したがって、本発明によれば、コアとクラ
ッドを有しその断面がほぼ真円に近い多孔質母材の表面
層を、この長手方向に断面がほぼ楕円形となるように削
り取った後、透明ガラス化して透明ガラス母材に形成
し、該透明ガラス母材を溶融してその断面をほぼ真円に
加工してコア部分を楕円形状にした後、該ガラス母材を
線引しコアが楕円状断面を有する偏波面保存光ファイバ
を製造する、偏波面保存光ファイバの製造方法が提供さ
れる。好適には、上記多孔質母材の研削を透明ガラス化
処理炉内で行う。Therefore, according to the present invention, after the surface layer of the porous base material having the core and the clad and the cross section of which is almost a perfect circle is scraped off so that the cross section becomes substantially elliptical in the longitudinal direction. , Transparent vitrification to form a transparent glass base material, melting the transparent glass base material and processing the cross section into a substantially perfect circle to form an elliptical core portion, and then drawing the glass base material to form a core A method for manufacturing a polarization-maintaining optical fiber is provided for manufacturing a polarization-maintaining optical fiber having an elliptical cross section. The grinding of the porous base material is preferably carried out in a transparent vitrification treatment furnace.

【０００９】[0009]

【作用】従来は、透明ガラス化後にクラッド部分の研削
を行っていたのに対して、本発明は透明ガラス化前の多
孔質母材の段階で研削を行う。そえゆえ、被研削体が軟
らかく研削し易いので、製造時間の短縮が図れる。また
この方法は、上述した応力歪み印加用部材を挿入する方
法における問題がない。しかも、このスートに対する研
削を透明ガラス化の直前の透明ガラス化炉挿入時に行え
ば、通常の光ファイバの製造工程と同様に、より短時間
で容易に偏波面保存光ファイバの製造を行うことができ
る。In the past, the clad portion was ground after the transparent vitrification, whereas in the present invention, the grinding is performed at the stage of the porous base material before the transparent vitrification. Therefore, the object to be ground is soft and easy to grind, so that the manufacturing time can be shortened. Further, this method does not have the problem in the method of inserting the stress-strain applying member described above. Moreover, if the soot is ground at the time of inserting the transparent vitrification furnace just before the transparent vitrification, the polarization-maintaining optical fiber can be easily manufactured in a shorter time, as in the ordinary optical fiber manufacturing process. it can.

【００１０】[0010]

【実施例】本発明の偏波面保存光ファイバの製造方法の
実施例について述べる。まず、通常の光ファイバ用多孔
質母材と同様に、多孔質母材を製造する。この多孔質母
材の製造方法としては、コア部分として（Ｇｅ）がドー
プされた石英系ガラスと、その周囲に形成されるクラッ
ドは純石英からなる多孔質母材をＶＡＤ法によって作製
した。その後、透明ガラス化処理を行い，２０ｍｍφの
ロッドに延伸した。この上にさらにＳｉＯ2 微粒子を堆
積させた。多孔質母材の直径は１４０ｍｍφ、長さは６
００ｍｍｌであった。コアとクラッド部の比屈折率差Δ
+ は０．３６％であった。EXAMPLE An example of a method of manufacturing a polarization-maintaining optical fiber according to the present invention will be described. First, a porous preform is manufactured in the same manner as a normal porous preform for optical fibers. As a method of manufacturing this porous base material, a silica-based glass doped with (Ge) as a core portion and a clad formed around the silica glass were made of pure quartz by a VAD method. After that, a transparent vitrification treatment was performed, and the rod was drawn into a 20 mmφ rod. SiO 2 particles were further deposited on this. The diameter of the porous base material is 140 mmφ and the length is 6
It was 00 ml. Difference in relative refractive index between core and clad Δ
+ Was 0.36%.

【００１１】この原多孔質母材１Ａを図１（Ａ）に示す
ような光ファイバの製造装置７中に挿入し，順次下降さ
せていく。図２（Ａ）に原多孔質母材１Ａの断面を示
す。原多孔質母材１Ａは、コア部１１とその外周に形成
されたクラッド部１２を有している。クラッド部１２の
外側部分は多孔質体である。この第一段階では、多孔質
母材１Ａの引下げ速度は２５０ｍｍ／ｈであり、この段
階でブレード３において多孔質母材１Ａの表面層の一部
を長手方向にゆっくりと研削して行く。多孔質母材１Ａ
の回転は行わない。The original porous preform 1A is inserted into an optical fiber manufacturing apparatus 7 as shown in FIG. 1A, and is gradually lowered. FIG. 2A shows a cross section of the original porous base material 1A. The raw porous base material 1A has a core portion 11 and a clad portion 12 formed on the outer periphery thereof. The outer portion of the clad portion 12 is a porous body. In this first step, the pulling-down speed of the porous base material 1A is 250 mm / h, and at this stage, a part of the surface layer of the porous base material 1A is slowly ground in the blade 3 in the longitudinal direction. Porous base material 1A
Is not rotated.

【００１２】ブレード３は図１（Ｂ）にその断面を示す
ように、光ファイバの製造装置７の原多孔質母材１Ａが
下降する部分に原多孔質母材１Ａの外径より細いエッジ
を設け，多孔質体なので柔らかいクラッド部１２が下降
する際、図２（Ｂ）に示すように、クラッド部１２の側
面を研削する。研削後の多孔質母材１Ｂの断面は、クラ
ッド部１２の研削のために、図２（Ｂ）に示すように、
ほぼ楕円形であった。この研削にともなって生じたスー
ト粉末は上部の排気口２または下部のスート排気口４か
ら排出される。As shown in the cross section of FIG. 1 (B), the blade 3 has an edge thinner than the outer diameter of the raw porous preform 1A at the portion where the raw porous preform 1A of the optical fiber manufacturing apparatus 7 descends. Since it is provided and is a porous body, when the soft clad portion 12 descends, the side surface of the clad portion 12 is ground as shown in FIG. The cross section of the porous base material 1B after grinding is, as shown in FIG. 2 (B), for grinding the clad portion 12,
It was almost oval. The soot powder generated by this grinding is discharged from the upper exhaust port 2 or the lower soot exhaust port 4.

【００１３】クラッド部１２の研削処理が終了した後、
研削後の多孔質母材１Ｂを１６２５°Ｃに設定された電
気炉５内へ１５０ｍｍ／ｈの速度で引き下げた。この
時、研削後の多孔質母材１Ｂを回転させ、その回転数は
１６ｒｐｍであった。光ファイバの製造装置７の下部の
反応ガス挿入口６から反応ガスが導入されるが、導入す
る反応ガスとしてはヘリウム（Ｈｅ）、塩素ガス（Ｃｌ
2 ）などがあり、それらの導入量はそれぞれ３０リット
ル／分、０．０５リットル／分であった。このようにし
て得た透明ガラス母材を２０００°Ｃ以上の線引炉内に
挿入して保持すると、溶融によって図２（Ｂ）に示した
クラッド部１２の断面が、図２（Ｃ）に示すように、楕
円から徐々に真円のクラッド部１２Ｂに近づいて行っ
た。クラッド部１２Ｂが真円になる過程で、このクラッ
ド部分１２Ｂの表面張力でコア部１１がコア部１１Ｂの
ように楕円になる。これが透明ガラス母材１Ｃである。After the grinding process of the clad portion 12 is completed,
The porous base material 1B after grinding was pulled down into the electric furnace 5 set at 1625 ° C at a speed of 150 mm / h. At this time, the porous base material 1B after grinding was rotated, and the rotation speed was 16 rpm. A reaction gas is introduced from the reaction gas insertion port 6 at the bottom of the optical fiber manufacturing apparatus 7, and the reaction gas to be introduced is helium (He), chlorine gas (Cl
2 ) and the like, and their introduction amounts were 30 liter / min and 0.05 liter / min, respectively. When the transparent glass preform thus obtained is inserted and held in a drawing furnace at 2000 ° C. or higher, the cross section of the clad portion 12 shown in FIG. As shown, the process proceeded gradually from the ellipse to the perfect circular clad portion 12B. In the process of forming the clad portion 12B into a perfect circle, the surface tension of the clad portion 12B causes the core portion 11 to be elliptical like the core portion 11B. This is the transparent glass base material 1C.

【００１４】透明ガラス母材１Ｃが充分に真円となった
時、線引炉において、図２（Ｄ）に示すように、クラッ
ド１２Ｄの外径（直径）が１２５μｍφになるように線
引きした。これにより、図２（Ｄ）に図示のごとき楕円
の断面をもつコア１１Ｄを有する偏波面保存光ファイバ
１Ｄが製造される。コアの長径は１３μｍ、短径は７μ
ｍであった。When the transparent glass preform 1C was sufficiently circular, it was drawn in a drawing furnace so that the outer diameter (diameter) of the clad 12D was 125 μmφ, as shown in FIG. 2 (D). As a result, the polarization-maintaining optical fiber 1D having the core 11D having an elliptical cross section as shown in FIG. 2D is manufactured. The major axis of the core is 13 μm, and the minor axis is 7 μm.
It was m.

【００１５】前記線引炉による線引後、ただちに紫外線
硬化樹脂をコーティングし外径２５０μｍφの光ファイ
バ素線とした。得られた条長６０ｋｍの偏波面保存光フ
ァイバの損失は、その中を伝搬する光の波長が１−３μ
ｍの範囲で０．３６ｄＢ／ｋｍ、１．５５μｍで０．２
２ｄＢ／ｋｍ、クロストークは−３２ｄＢ（１ｋｍ）で
あり、偏波面保存光ファイバとして充分な特性を有して
いることが判る。Immediately after the drawing with the drawing furnace, an ultraviolet curable resin was coated to obtain an optical fiber element wire having an outer diameter of 250 μmφ. The loss of the polarization-maintaining single-mode fiber with a strip length of 60 km obtained was such that the wavelength of the light propagating therein was 1-3 μm.
0.36 dB / km in the range of m, 0.2 in 1.55 μm
The crosstalk is 2 dB / km and the crosstalk is -32 dB (1 km), and it can be seen that the polarization-maintaining optical fiber has sufficient characteristics.

【００１６】本実施例では、コア部分にＧｅをドープし
た石英系ガラス、クラッドは純石英ガラスから成ってい
るが、これらの組成は導波路構造を存するであればどの
ようなものであっても良い。例えば、コアは微量のＧｅ
とフッ素（Ｆ）をドープした石英系ガラス、クラッドは
より多くＦをドープしたものでも容易に偏波面保存光フ
ァイバを得ることができる。この場合コアのガラスロッ
ド上にＳｉＯ2 の多孔質母材を堆積させた後、図１
（Ａ）に示すような光ファイバの製造装置７の中でスー
トの表面層の一部をスートの長手方向に研削し、しかる
後にＨｅ、ＳｉＦ4 、Ｃｌ2 の雰囲気中で透明ガラス化
する。この透明ガラス母材を前記した方法で線引きすれ
ば、偏波面保存光ファイバが得られる。Ｆをドープした
クラッドを有する光ファイバでは、コアのＧｅ量が微小
なためレーリー散乱係数が小さくなり、損失は伝搬光の
波長が１．３μｍで０．３２ｄＢ／ｋｍ、１．５５μｍ
で０．１８ｄＢ／ｋｍであった。また、クロストークは
−３１ｄｂ（１ｋｍ）であった。In the present embodiment, the core portion is made of Ge-doped silica glass and the clad is made of pure silica glass, but any composition may be used as long as it has a waveguide structure. good. For example, the core is a small amount of Ge
It is possible to easily obtain a polarization-maintaining optical fiber by using silica glass doped with fluorine and fluorine (F), and by using more cladding with F. In this case, after depositing a porous base material of SiO 2 on the glass rod of the core,
A part of the surface layer of the soot is ground in the longitudinal direction of the soot in the optical fiber manufacturing apparatus 7 as shown in (A), and then it is transparent vitrified in an atmosphere of He, SiF 4 , and Cl 2 . A polarization-maintaining optical fiber can be obtained by drawing the transparent glass preform by the method described above. In an optical fiber having an F-doped clad, the Ge amount of the core is so small that the Rayleigh scattering coefficient is small, and the loss is 0.32 dB / km and 1.55 μm when the wavelength of propagating light is 1.3 μm.
Was 0.18 dB / km. The crosstalk was -31db (1km).

【００１７】[0017]

【発明の効果】本発明によれば、通常の光ファイバの製
造工程とほぼ同一の工程で、容易に従来より長尺の偏波
面保存光ファイバが得られるから、品質が安定し、条長
が長い偏波面保存光ファイバを低価格で製造できる。According to the present invention, a polarization-maintaining optical fiber longer than the conventional one can be easily obtained in almost the same process as a normal optical fiber manufacturing process, so that the quality is stable and the strip length is long. A long polarization-maintaining optical fiber can be manufactured at low cost.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明の偏波面保存光ファイバを製造する方法
に適用する光ファイバの製造装置の断面と偏波面保存光
ファイバを製造する方法を説明する図である。FIG. 1 is a diagram illustrating a cross section of an optical fiber manufacturing apparatus applied to a method of manufacturing a polarization-maintaining optical fiber of the present invention and a method of manufacturing a polarization-maintaining optical fiber.

【図２】図１における偏波面保存光ファイバの製造過程
における多孔質母材と偏波面保存光ファイバの断面図で
ある。2 is a cross-sectional view of a porous preform and a polarization-maintaining optical fiber in a manufacturing process of the polarization-maintaining optical fiber in FIG.

【図３】従来の偏波面保存光ファイバの製造方法を説明
する図である。FIG. 3 is a diagram illustrating a method of manufacturing a conventional polarization-maintaining optical fiber.

【図４】従来の他の偏波面保存光ファイバの製造方法を
説明する図である。FIG. 4 is a diagram illustrating another conventional method for manufacturing a polarization-maintaining optical fiber.

【符号の説明】[Explanation of symbols]

１Ａ・・原多孔質母材 １Ｂ・・研削後の多孔質
母材 １Ｃ・・透明ガラス母材 ３・・ブレード ４・・スート排気口 ５・・加熱炉 ６・・反応ガス導入口 ７・・光ファイバの製造装置 １１・・コア部 １２・・クラッド部 １２Ａ・・楕円クラッド部 １１Ｂ・・楕円コア部 １２Ｂ・・真円クラッド部1A ・ ・ raw porous base material 1B ・ ・ porous base material after grinding 1C ・ ・ transparent glass base material 3 ・ ・ blade 4 ・ ・ soot exhaust port 5 ・ ・ heating furnace 6 ・ ・ reaction gas inlet 7 ・ ・Optical fiber manufacturing equipment 11 ... Core part 12 ... Clad part 12A ... Elliptical clad part 11B ... Elliptical core part 12B ...

Claims (2)

【特許請求の範囲】[Claims] 【請求項１】コアとクラッドを有しその断面がほぼ真円
に近い多孔質母材の表面層を、この長手方向に断面がほ
ぼ楕円形となるように削り取った後、透明ガラス化して
透明ガラス母材に形成し、該透明ガラス母材を溶融して
その断面をほぼ真円に加工してコア部分を楕円形状にし
た後、該ガラス母材を線引しコアが楕円状断面を有する
偏波面保存光ファイバを製造する、偏波面保存光ファイ
バの製造方法。1. A surface layer of a porous base material having a core and a clad whose cross section is substantially a true circle is scraped off so that its cross section becomes substantially elliptical in the longitudinal direction, and then transparentized by vitrification. After forming into a glass base material, melting the transparent glass base material and processing the cross section into a nearly perfect circle to make the core part elliptical, the glass base material is drawn and the core has an elliptical cross section. A method for manufacturing a polarization-maintaining optical fiber, which manufactures a polarization-maintaining optical fiber. 【請求項２】上記多孔質母材の研削を透明ガラス化処理
炉内で行うことを特徴とする請求項１記載の偏波面保存
光ファイバの製造方法。2. The method for producing a polarization-maintaining optical fiber according to claim 1, wherein the grinding of the porous preform is carried out in a transparent vitrification treatment furnace.
JP4076015A 1992-02-27 1992-02-27 Production of polarization plane maintaining optical fiber Pending JPH05238769A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4076015A JPH05238769A (en) 1992-02-27 1992-02-27 Production of polarization plane maintaining optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4076015A JPH05238769A (en) 1992-02-27 1992-02-27 Production of polarization plane maintaining optical fiber

Publications (1)

Publication Number Publication Date
JPH05238769A true JPH05238769A (en) 1993-09-17

Family

ID=13593002

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4076015A Pending JPH05238769A (en) 1992-02-27 1992-02-27 Production of polarization plane maintaining optical fiber

Country Status (1)

Country Link
JP (1) JPH05238769A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113548797A (en) * 2021-07-02 2021-10-26 哈尔滨工程大学 Preparation method of elliptical core optical fiber

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113548797A (en) * 2021-07-02 2021-10-26 哈尔滨工程大学 Preparation method of elliptical core optical fiber

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