JP3338615B2 - Optical fiber for components - Google Patents
Optical fiber for componentsInfo
- Publication number
- JP3338615B2 JP3338615B2 JP19407696A JP19407696A JP3338615B2 JP 3338615 B2 JP3338615 B2 JP 3338615B2 JP 19407696 A JP19407696 A JP 19407696A JP 19407696 A JP19407696 A JP 19407696A JP 3338615 B2 JP3338615 B2 JP 3338615B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- radius
- fiber
- curvature
- bobbin
- 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
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
- C03B37/075—Manufacture of non-optical fibres or filaments consisting of different sorts of glass or characterised by shape, e.g. undulated fibres
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2201/00—Type of glass produced
- C03B2201/06—Doped silica-based glasses
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/02—External structure or shape details
- C03B2203/06—Axial perturbations, e.g. twist, by torsion, undulating, crimped
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)
- Light Guides In General And Applications Therefor (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、光増幅器などの
いわゆる光部品に用いられる石英系の光ファイバに関す
るものであり、特に、小径に光ファイバを巻いた場合で
も好適なものを提供する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silica-based optical fiber used for a so-called optical component such as an optical amplifier, and more particularly to an optical fiber suitable for winding an optical fiber with a small diameter.
【０００２】[0002]
【従来の技術】エルビウムドープファイバや分散補償フ
ァイバ、ＰＡＮＤＡ型光ファイバなどの光ファイバ型の
部品は小型化のために小径のボビンに巻かれて使用され
ることが多い。しかしながら、小径にすればするほど巻
かれた光ファイバの外側表面には大きな引張り方向の機
械的ストレスが加わるために，破断しやすく機械的な信
頼性に乏しかった。また、この断面方向の不均一な歪み
は光ファイバの構成材料である石英ガラスに異方性をも
たらし、ＰＤＬ（ Polarization Dependent Loss）特性
を劣化させる原因となっていた。ところで、機械的な信
頼性を確保する方策として、これまでは光ファイバの表
面にカーボンをコーティングすることでｎ値（光ファイ
バの疲労係数）を大きくとり破断に至るまでの寿命を長
くする手法が採られることがあった。このほかにも光フ
ァイバの外径を通常の１２５μｍよりも小さくし歪みの
低減を図る手法を採ることもあった。また、ＰＤＬ特性
劣化防止のためには、巻き半径をある程度大きく保つ
か、光ファイバの外径を通常の１２５μｍよりも小さく
するという手法が採られていた。2. Description of the Related Art Optical fiber type components such as erbium-doped fiber, dispersion compensating fiber, and PANDA type optical fiber are often wound around a small diameter bobbin for miniaturization. However, as the diameter becomes smaller, the outer surface of the wound optical fiber is subjected to a large mechanical stress in the tensile direction, so that the optical fiber is easily broken and has poor mechanical reliability. In addition, the non-uniform strain in the cross-sectional direction causes anisotropy in quartz glass, which is a constituent material of the optical fiber, and causes deterioration of PDL (Polarization Dependent Loss) characteristics. By the way, as a measure to secure mechanical reliability, a method of coating carbon on the surface of an optical fiber to increase the n-value (fatigue coefficient of the optical fiber) so as to prolong the life until breakage has been used. It was sometimes taken. In addition, there has been a method in which the outer diameter of the optical fiber is made smaller than the normal 125 μm to reduce distortion. Further, in order to prevent the PDL characteristics from being deteriorated, a method of keeping the winding radius large to some extent or making the outer diameter of the optical fiber smaller than the usual 125 μm has been adopted.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、従来の
光ファイバの表面にカーボン膜を形成する手法では、カ
ーボン膜にピンホールが生じていると、その部分のｎ値
は通常の光ファイバのそれと何等変わらずピンホールの
箇所で機械的破断までの寿命を短くしてしまうというこ
とがあった。また、この手法では石英ガラス内の歪みは
全く低減されていないため、ＰＤＬ特性劣化の観点から
は何等対策となっておらず、小径に巻いた場合にＰＤＬ
特性は通常の光ファイバと同様に悪化してしまうという
ことがあった。However, according to the conventional method of forming a carbon film on the surface of an optical fiber, if a pinhole is formed in the carbon film, the n value at that portion is not much different from that of a normal optical fiber. In some cases, the life until mechanical breakage is shortened at the pinhole. In addition, since the distortion in the quartz glass is not reduced at all by this method, no measure is taken from the viewpoint of PDL characteristic deterioration, and the PDL is not wrapped in a small diameter.
In some cases, the characteristics are deteriorated like ordinary optical fibers.
【０００４】さらに、光ファイバの外径を通常の１２５
μｍよりも小さくする手法、例えば８０μｍにした場
合、断面積は（８０／１２５）2 に減少するので光ファ
イバの引張強度自体が約６割程低下してしまうという問
題がある。また、通常の１２５μｍファイバとの接続が
困難であるという問題もある。さらにまた、ＰＤＬ特性
劣化防止のために巻き半径を大きく採ると小型化に限界
がある。Further, the outer diameter of the optical fiber is set to a normal value of 125.
In the case of a method of making the diameter smaller than μm, for example, 80 μm, there is a problem that the tensile strength itself of the optical fiber is reduced by about 60% because the cross-sectional area is reduced to (80/125) 2 . There is also a problem that it is difficult to connect to a normal 125 μm fiber. Furthermore, if a large winding radius is used to prevent PDL characteristic deterioration, there is a limit to miniaturization.
【０００５】[0005]
【課題を解決する手段】この発明は、以上の問題の解決
を図ったもので、その特徴とする請求項１記載の発明
は、光ファイバを比較的に小さな曲率半径のコイル状に
巻いて構成してなる部品用光ファイバにおいて、前記光
ファイバが作製時に所定の曲率半径を有するようになさ
れたものであることを特徴とする部品用光ファイバ。SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and the invention according to claim 1 is characterized in that an optical fiber is wound into a coil having a relatively small radius of curvature. and in the component optical fiber comprising a component optical fiber, wherein the optical fiber is of the name of <br/> been to have a predetermined radius of curvature during the production.
【０００６】[0006]
【発明の実施の形態】この発明においては、光ファイバ
の作製時に所定の曲率半径を有するようにする。その手
段としては、例えば、光ファイバ母材の特定の側面とそ
の反対側の側面との間に溶融段階で粘度差が生じるよう
にする。具体的には、光ファイバ母材そのものにドーパ
ントの添加により粘度差を生じさせる方法や、光ファイ
バ母材の線引き時の雰囲気に温度差を与えるなどがあ
る。このようにして得られた所定の曲率半径を有するよ
うに作製された光ファイバを、予め設定されたより小さ
な曲率半径のボビンに巻回してコイル状とする。光ファ
イバはもともとが曲げを有する状態のものであるので、
それをより曲率の小さなコイル状態にしても、真直な光
ファイバと比較すると曲げられる程度が相対的に小さく
て済むこととなり、ファイバ表面に生じるストレスを小
さく抑えることができ、機械的な信頼性に優れたものと
なる。DESCRIPTION OF THE PREFERRED EMBODIMENTS In the present invention, a predetermined radius of curvature is provided when an optical fiber is manufactured. This can be achieved, for example, by causing a viscosity difference between the specific side of the optical fiber preform and the opposite side during the melting stage. Specifically, there are a method of causing a difference in viscosity by adding a dopant to the optical fiber preform itself, and a method of giving a temperature difference to an atmosphere at the time of drawing the optical fiber preform. The thus obtained optical fiber having a predetermined radius of curvature is wound around a bobbin having a smaller radius of curvature set in advance to form a coil. Since optical fibers are originally bent,
Even if it is in a coil state with a smaller curvature, the degree of bending can be relatively small as compared with a straight optical fiber, so that the stress generated on the fiber surface can be suppressed small, and mechanical reliability is reduced. It will be excellent.
【０００７】また、曲げられる程度が相対的に小さくて
済むことから、ガラス内の歪みも同時に低減できＰＤＬ
特性劣化をも同時に抑制できる。なお、用いられる光フ
ァイバの外径は典型的な１２５μｍとされるが、それよ
りも小さく、例えば８０μｍ程度とすることもできる。
その場合、断面積が小さいため機械的な強度そのものが
小さいが、曲率半径を小さくとることができる。Further, since the degree of bending can be relatively small, the distortion in the glass can be reduced at the same time.
Deterioration of characteristics can be suppressed at the same time. The outer diameter of the optical fiber used is typically 125 μm, but may be smaller, for example, about 80 μm.
In this case, the mechanical strength itself is small due to the small cross-sectional area, but the radius of curvature can be reduced.
【０００８】具体的な光ファイバの曲率半径としては、
５〜３０ｃｍ程度とされ、これを曲率半径２〜５ｃｍ程
度のボビンにコイル状態に巻いて部品用光ファイバとし
て使用する。コイル状にして使用される典型的な部品用
光ファイバとしては、エルビウムドープファイバ、分散
補償ファイバ、ＰＡＮＤＡ型光ファイバ等があげられ
る。The specific radius of curvature of an optical fiber is as follows:
This is wound around a bobbin having a radius of curvature of about 2 to 5 cm in a coil state and used as an optical fiber for components. Typical optical fibers for components used in the form of coils include erbium-doped fibers, dispersion compensating fibers, and PANDA type optical fibers.
【０００９】[0009]
実験例１ 曲率半径が６ｃｍの曲がりを持つ直径１２５μｍの石英
系分散補償ファイバを半径３ｃｍのボビンにコイル状に
巻いた。この場合、ファイバの表面に生じる歪みはおよ
そ０．１０％であった。この歪みの程度は、通常のほぼ
真直なファイバを同様に半径３ｃｍのボビンにコイル状
に巻いた場合に生じる歪みがおよそ０．２１％であるこ
とを考えると半減させることができたことになる。な
お、一般的に十分な信頼度を得るために用いられる光フ
ァイバの曲げ半径は６ｃｍとされており、このときのフ
ァイバ表面に生じる歪みは約０．１０％である。このこ
とより、半径３ｃｍのボビンにコイル状に巻いた場合で
も十分な信頼度が得られていることが確認された。EXPERIMENTAL EXAMPLE 1 A 125 μm diameter quartz dispersion compensating fiber having a bend having a curvature radius of 6 cm was wound around a bobbin having a radius of 3 cm in a coil shape. In this case, the strain generated on the surface of the fiber was about 0.10%. The extent of this distortion could be reduced by half, considering that the distortion generated when a normal almost straight fiber is similarly coiled around a bobbin having a radius of 3 cm is about 0.21%. . Note that the bending radius of an optical fiber used to obtain sufficient reliability is generally 6 cm, and the strain generated on the fiber surface at this time is about 0.10%. From this, it was confirmed that sufficient reliability was obtained even when the coil was wound around a bobbin having a radius of 3 cm.
【００１０】実験例２ 曲率半径が６ｃｍの曲がりを持つ直径１２５μｍのエル
ビウムドープ石英系ファイバを半径３ｃｍのボビンにコ
イル状に巻き、励起用ＬＤと組み合わせて光ファイバ増
幅器を構成した。このときのファイバの表面に生じる歪
みは実験例１と同様におよそ０．１０％であった。ま
た、信号（１．５５μｍ帯）光の増幅特性の偏光依存性
を測定したところ０．０１ｄＢｐ．ｐ．以下であり良好
であった。比較として、ほぼ真直なエルビウムドープフ
ァイバを同様にして構成した場合、その増幅特性の偏光
依存性は０．１ｄＢｐ．ｐ．まで増加してしまった。Experimental Example 2 An optical fiber amplifier was constructed by winding an erbium-doped quartz fiber having a bend having a curvature radius of 6 cm and a diameter of 125 μm around a bobbin having a radius of 3 cm in a coil shape, and combining with a pumping LD. At this time, the strain generated on the surface of the fiber was about 0.10% as in Experimental Example 1. Further, when the polarization dependence of the amplification characteristic of the signal (1.55 μm band) light was measured to be 0.01 dBp. p. The following was good. For comparison, when a substantially straight erbium-doped fiber is similarly configured, the polarization dependence of its amplification characteristics is 0.1 dBp. p. Has increased.
【００１１】実験例３ 曲率半径が１５ｃｍの曲がりを持つ外径８０μｍの石英
系分散補償ファイバを半径３ｃｍのボビンにコイル状に
巻いた。この場合のファイバ表面に生じる歪みはおよそ
０．１０％であり、通常のほぼ真直なファイバを同様に
半径３ｃｍのボビンにコイル状に巻いた場合に生じる歪
みの計算結果がおよそ０．２１％であるのに比較して小
さくすることができた。Experimental Example 3 A silica-based dispersion compensating fiber having an outer diameter of 80 μm and having a bend having a radius of curvature of 15 cm was wound in a coil shape around a bobbin having a radius of 3 cm. In this case, the strain generated on the fiber surface is about 0.10%, and the calculation result of the strain generated when a normal almost straight fiber is similarly coiled around a bobbin having a radius of 3 cm is about 0.21%. It was smaller than there was.
【００１２】実験例４ 曲率半径が６ｃｍの曲がりを持つ外径８０μｍの石英系
分散補償ファイバを半径２．４ｃｍのボビンにコイル状
に巻いた。この場合、ファイバの表面に生じる歪みはお
よそ０．１０％と計算でき、通常のほぼ真直なファイバ
を同様に半径２．４ｃｍのボビンにコイル状に巻いた場
合に生じる歪みの計算結果である約０．２６％と比較し
て約２／５に低減することができた。Experimental Example 4 A silica-based dispersion compensating fiber having an outer diameter of 80 μm and having a bend having a curvature radius of 6 cm was wound around a bobbin having a radius of 2.4 cm in a coil shape. In this case, the strain generated on the surface of the fiber can be calculated to be about 0.10%, which is a calculation result of the strain generated when a normal almost straight fiber is similarly coiled around a bobbin having a radius of 2.4 cm. It was able to be reduced to about 2/5 compared to 0.26%.
【００１３】[0013]
【発明の効果】この発明による部品用光ファイバは、予
め所定の曲げ半径を有するものであるので、それよりも
小さな曲げを加えても相対的な歪みは小さくて済むた
め、機械的な信頼度の高いものを提供できる。また、フ
ァイバ内に生じる光学的な異方性を小さくなし得るの
で、ＰＤＬ特性の劣化を抑制できるという副次的な効果
もある。Since the optical fiber for components according to the present invention has a predetermined bending radius in advance, the relative distortion can be reduced even if a bending smaller than that is applied, so that the mechanical reliability is improved. Can be provided. Further, since the optical anisotropy generated in the fiber can be reduced, there is also a secondary effect that deterioration of PDL characteristics can be suppressed.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 高橋 浩一 千葉県佐倉市六崎1440番地 株式会社フ ジクラ佐倉工場内 (56)参考文献 特開 平４−234709（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G02B 6/00 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Koichi Takahashi 1440 Mutsuzaki, Sakura City, Chiba Prefecture Inside Fujikura Sakura Factory (56) References JP-A-4-234709 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) G02B 6/00
Claims (1)
コイル状に巻いて構成してなる部品用光ファイバにおい
て、前記光ファイバが作製時に所定の曲率半径を有する
ようになされたものであることを特徴とする部品用光フ
ァイバ。1. A optical fiber part comprising constructed by winding a relatively small radius of curvature like coil an optical fiber, said optical fiber is one which is such to have a predetermined radius of curvature during the production An optical fiber for components, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19407696A JP3338615B2 (en) | 1996-07-05 | 1996-07-05 | Optical fiber for components |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19407696A JP3338615B2 (en) | 1996-07-05 | 1996-07-05 | Optical fiber for components |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1020133A JPH1020133A (en) | 1998-01-23 |
| JP3338615B2 true JP3338615B2 (en) | 2002-10-28 |
Family
ID=16318567
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19407696A Expired - Fee Related JP3338615B2 (en) | 1996-07-05 | 1996-07-05 | Optical fiber for components |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3338615B2 (en) |
-
1996
- 1996-07-05 JP JP19407696A patent/JP3338615B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1020133A (en) | 1998-01-23 |
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