JPH0854546A - Small diameter optical fiber - Google Patents
Small diameter optical fiberInfo
- Publication number
- JPH0854546A JPH0854546A JP6188635A JP18863594A JPH0854546A JP H0854546 A JPH0854546 A JP H0854546A JP 6188635 A JP6188635 A JP 6188635A JP 18863594 A JP18863594 A JP 18863594A JP H0854546 A JPH0854546 A JP H0854546A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- coating layer
- diameter
- modulus
- young
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C25/00—Surface treatment of fibres or filaments made from glass, minerals or slags
- C03C25/10—Coating
- C03C25/104—Coating to obtain optical fibres
- C03C25/1065—Multiple coatings
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Surface Treatment Of Glass Fibres Or Filaments (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は細径の光ファイバ裸線を
用いてなる細径光ファイバに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin optical fiber using a bare bare optical fiber.
【０００２】[0002]
【従来の技術】一般に、光ファイバは光ファイバ裸線の
周上に一次被覆および二次被覆を施して形成される。従
来より汎用されているのは光ファイバ裸線の外径が１２
５μｍで、被覆外径すなわち光ファイバの外径が２５０
μｍのもので、これを規格として分散補償光ファイバや
希土類添加光ファイバなど各種の光ファイバも製造され
ている。図３は従来の光ファイバの例を示す断面図で、
図中符号１１は光ファイバである。この光ファイバ１１
は、外径１２５μｍの光ファイバ裸線１２の周上に一次
被覆層１３および二次被覆層１４が順次形成されてい
る。一次被覆層１３および二次被覆層１４は紫外線硬化
型樹脂（以下、ＵＶ樹脂と略記する）等の合成樹脂を用
いて形成され、一次被覆層１３には硬化後のヤング率
（２０℃におけるヤング率、以下同様）が０．０１〜
１．０ｋｇ／ｍｍ2程度の樹脂、二次被覆層１４には硬
化後のヤング率が３０〜８０ｋｇ／ｍｍ2程度の樹脂が
用いられる。2. Description of the Related Art Generally, an optical fiber is formed by applying a primary coating and a secondary coating on the circumference of a bare optical fiber. Conventionally, the outer diameter of bare optical fiber is 12
5 μm, coating outer diameter, that is, the outer diameter of the optical fiber is 250
Various optical fibers such as a dispersion compensating optical fiber and a rare earth-doped optical fiber are manufactured with this as a standard. FIG. 3 is a sectional view showing an example of a conventional optical fiber,
Reference numeral 11 in the figure is an optical fiber. This optical fiber 11
The primary coating layer 13 and the secondary coating layer 14 are sequentially formed on the circumference of the bare optical fiber 12 having an outer diameter of 125 μm. The primary coating layer 13 and the secondary coating layer 14 are formed using a synthetic resin such as an ultraviolet curable resin (hereinafter abbreviated as UV resin), and the primary coating layer 13 has a Young's modulus after curing (Young's modulus at 20 ° C.). Rate, the same below) is 0.01 to
A resin having a Young's modulus after curing of about 30 to 80 kg / mm 2 is used for the resin having a weight of about 1.0 kg / mm 2 .
【０００３】[0003]
【発明が解決しようとする課題】光インターコネクショ
ンなどの用途では、光ファイバを高密度で、狭い空間に
収納することが要求される。このような用途では、光フ
ァイバの外径が小さくて収納効率が良いこと、および許
容曲げ半径が小さいことが要求される。また分散補償フ
ァイバなど、比較的長尺の光ファイバをコイル状に巻い
て、光部品として機器内に収納して用いる場合には、光
ファイバの許容曲げ半径によってコイルの大きさが制限
されるため、許容曲げ半径は小さい方が望ましい。さら
に、今後、希土類添加光ファイバを収納した小型モジュ
ールの必要性が高まることが予想されるが、この分野で
も光ファイバの許容曲げ半径が小さい方が有利である。In applications such as optical interconnection, it is required to store optical fibers at a high density in a narrow space. In such applications, it is required that the outer diameter of the optical fiber is small and the storage efficiency is good, and that the allowable bending radius is small. When a relatively long optical fiber such as a dispersion compensating fiber is wound into a coil and used as an optical component housed in a device, the size of the coil is limited by the allowable bending radius of the optical fiber. It is desirable that the allowable bending radius is small. Furthermore, although it is expected that the need for a small module containing a rare earth-doped optical fiber will increase in the future, it is advantageous in this field that the allowable bending radius of the optical fiber is small.
【０００４】ところが前述のような従来の光ファイバの
許容曲げ半径は、機械的強度の長期信頼性を考慮すると
６２．５ｍｍ以上必要とされている。ここで、光ファイ
バ裸線径に対する許容曲げ半径の求め方は次の通りであ
る。一定の曲げひずみεに対する許容曲げ半径Ｄｂは、
光ファイバ裸線の外径をＤｆとすると、Ｄｂ＝Ｄｆ／ε
で変化する。したがって光ファイバ裸線の外径Ｄｆを小
さくすることによって、光ファイバの許容曲げ半径Ｄｂ
を小さくすることができる。例えば、曲げひずみを０．
２％とすると、光ファイバ裸線の外径が１２５μｍの光
ファイバでは、曲げ半径は６２．５ｍｍ程度までしか許
容できない。しかし、仮に光ファイバ裸線の外径を５０
μｍと小さくすると、曲げ半径は２４ｍｍまで許容され
るようになる。ただし、単に光ファイバ裸線の外径を細
くしただけで、従来の被覆構造と同様の光ファイバを構
成した場合には、マイクロベンド等による伝送損失の増
加という問題が生じていた。However, the allowable bending radius of the conventional optical fiber as described above is required to be 62.5 mm or more in consideration of long-term reliability of mechanical strength. Here, the method for obtaining the allowable bending radius with respect to the bare optical fiber diameter is as follows. The allowable bending radius Db for a constant bending strain ε is
If the outer diameter of the bare optical fiber is Df, then Db = Df / ε
Changes. Therefore, by reducing the outer diameter Df of the bare optical fiber, the allowable bending radius Db of the optical fiber is reduced.
Can be made smaller. For example, bending strain of 0.
If it is 2%, the bending radius of the optical fiber whose outer diameter of the bare optical fiber is 125 μm can be only allowed up to about 62.5 mm. However, if the outer diameter of the bare optical fiber is 50
When it is made as small as μm, the bending radius is allowed up to 24 mm. However, when an optical fiber having the same coating structure as in the related art is constructed by simply reducing the outer diameter of the bare optical fiber, there is a problem that transmission loss increases due to microbends and the like.
【０００５】本発明は前記事情に鑑みてなされたもの
で、伝送損失を増加させることなく、光ファイバ裸線の
外径を小さくできるようにした光ファイバの提供を目的
とするものである。The present invention has been made in view of the above circumstances, and an object thereof is to provide an optical fiber in which the outer diameter of the bare optical fiber can be reduced without increasing the transmission loss.
【０００６】[0006]
【課題を解決するための手段】本発明の光ファイバは、
外径が１２５μｍより小さい光ファイバ裸線の周上に、
ヤング率０．１ｋｇ／ｍｍ2以下の一次被覆層を有し、
該一次被覆層の周上にヤング率１５０ｋｇ／ｍｍ2以上
の二次被覆層を有することを前記課題の解決手段とし
た。The optical fiber of the present invention comprises:
On the circumference of bare optical fiber whose outer diameter is smaller than 125 μm,
Young's modulus having a primary coating layer of 0.1 kg / mm 2 or less,
Having a secondary coating layer having a Young's modulus of 150 kg / mm 2 or more on the circumference of the primary coating layer was taken as a means for solving the above problems.
【０００７】[0007]
【作用】本発明の細径光ファイバにあっては、光ファイ
バ裸線の外径を１２５μｍよりも小さくすることによっ
て、細径で収納効率が良く、また許容曲げ半径が小さい
光ファイバを得ることができる。さらに一次被覆層を低
ヤング率とし、二次被覆層を高ヤング率とすることによ
って、光ファイバ裸線の外径を細くしてもマイクロベン
ドによる伝送損失の増加を抑えることができる。In the small-diameter optical fiber of the present invention, by making the outer diameter of the bare optical fiber smaller than 125 μm, it is possible to obtain an optical fiber having a small diameter, good storage efficiency, and a small allowable bending radius. You can Furthermore, by setting the primary coating layer to a low Young's modulus and the secondary coating layer to a high Young's modulus, it is possible to suppress an increase in transmission loss due to microbending even if the outer diameter of the bare optical fiber is reduced.
【０００８】[0008]
【実施例】以下、本発明を詳しく説明する。図１は本発
明の細径光ファイバの一実施例を示したもので、図中符
号１は細径光ファイバである。この細径光ファイバ１
は、光ファイバ裸線２の周上に一次被覆層３が形成さ
れ、一次被覆層３の周上に二次被覆層４が形成されたも
のである。本発明の細径光ファイバ１を構成する光ファ
イバ裸線２は、外径が１２５μｍよりも小さい細径のも
のである。光ファイバ裸線２は周知の紡糸手段で製造す
ることができ、光ファイバ母材の線引条件を適宜変化さ
せることによって所望の外径のものを得ることができ
る。光ファイバ裸線２の外径は用途によって適宜変える
ことができ、外径が細いほど収納効率が高く、許容曲げ
半径が小さい細径光ファイバが得られるが、細すぎると
製造が困難になる。The present invention will be described in detail below. FIG. 1 shows an embodiment of a small-diameter optical fiber of the present invention, in which reference numeral 1 is a small-diameter optical fiber. This small diameter optical fiber 1
In the above, the primary coating layer 3 is formed on the circumference of the bare optical fiber 2, and the secondary coating layer 4 is formed on the circumference of the primary coating layer 3. The bare optical fiber 2 that constitutes the thin optical fiber 1 of the present invention has a thin outer diameter smaller than 125 μm. The bare optical fiber 2 can be manufactured by a well-known spinning means, and a desired outer diameter can be obtained by appropriately changing the drawing conditions of the optical fiber preform. The outer diameter of the bare optical fiber 2 can be appropriately changed depending on the application. The smaller the outer diameter is, the higher the storage efficiency is, and the thin bendable optical fiber having a small allowable bending radius can be obtained.
【０００９】本発明の細径光ファイバ１を構成する一次
被覆層３は、硬化後のヤング率が０．１ｋｇ／ｍｍ2以
下の合成樹脂を用いて形成される。この一次被覆層３を
形成する樹脂としては各種のＵＶ樹脂が好適に用いら
れ、所望のヤング率に応じて適宜選択することができ
る。例えば、アクリレート樹脂等のＵＶ樹脂が好ましく
用いられる。また二次被覆層４は、硬化後のヤング率が
１５０ｋｇ／ｍｍ2以上の合成樹脂を用いて形成され
る。この二次被覆層４を形成する樹脂としては各種のＵ
Ｖ樹脂が好適に用いられ、所望のヤング率に応じて適宜
選択することができる。例えば、アクリレート樹脂等の
ＵＶ樹脂が好ましく用いられる。一次被覆層３および二
次被覆層４の厚さは、厚すぎると細径光ファイバ１の外
径が大きくなる。また薄すぎると十分な強度、耐性が得
られず、一次被覆層の厚さは３０μｍ程度、二次被覆層
の厚さは２０μｍ程度必要である。また本発明の細径光
ファイバは、分散補償光ファイバや希土類添加光ファイ
バなど各種の機能を有する特殊光ファイバにも同様にし
て有効に用いられる。The primary coating layer 3 constituting the small-diameter optical fiber 1 of the present invention is formed by using a synthetic resin having a Young's modulus after curing of 0.1 kg / mm 2 or less. Various UV resins are preferably used as the resin forming the primary coating layer 3, and can be appropriately selected according to the desired Young's modulus. For example, UV resin such as acrylate resin is preferably used. The secondary coating layer 4 is formed by using a synthetic resin having a Young's modulus after curing of 150 kg / mm 2 or more. As the resin forming the secondary coating layer 4, various types of U
V resin is preferably used and can be appropriately selected according to the desired Young's modulus. For example, UV resin such as acrylate resin is preferably used. If the thicknesses of the primary coating layer 3 and the secondary coating layer 4 are too thick, the outer diameter of the small-diameter optical fiber 1 becomes large. If it is too thin, sufficient strength and resistance cannot be obtained, and the thickness of the primary coating layer is required to be about 30 μm and the thickness of the secondary coating layer is required to be about 20 μm. Further, the small-diameter optical fiber of the present invention can be effectively used in the same manner as a special optical fiber having various functions such as a dispersion compensating optical fiber and a rare earth-doped optical fiber.
【００１０】（実施例１）図１に示すような構造を有す
る細径の１．５５μｍ帯分散シフト光ファイバを製造し
た。下記第１表に示すように、一次被覆層は従来と同様
のＵＶ樹脂を使用し、二次被覆層はヤング率が異る４種
類のＵＶ樹脂を用いて作製して、伝送損失特性を比較し
た。またいずれも光ファイバ裸線の外径は６０μｍと
し、一次被覆層の厚さは３０μｍ、二次被覆層の厚さは
２０μｍとして、細径光ファイバの外径は１６０μｍと
した。Example 1 A small diameter 1.55 μm band dispersion shifted optical fiber having a structure as shown in FIG. 1 was manufactured. As shown in Table 1 below, the primary coating layer is made of the same UV resin as the conventional one, and the secondary coating layer is made of four kinds of UV resins having different Young's moduli, and the transmission loss characteristics are compared. did. In each case, the outer diameter of the bare optical fiber was 60 μm, the thickness of the primary coating layer was 30 μm, the thickness of the secondary coating layer was 20 μm, and the outer diameter of the small-diameter optical fiber was 160 μm.
【００１１】[0011]
【表１】 [Table 1]
【００１２】これら細径光ファイバの１．５５μｍにお
ける伝送損失特性は、従来品１で０．２８ｄＢ／ｋｍ、
試作品１で０．２４ｄＢ／ｋｍ、試作品２で０．２１ｄ
Ｂ／ｋｍ、試作品３で０．２１ｄＢ／ｋｍであった。こ
れらの結果より、低損失な細径光ファイバを作製するた
めには、二次被覆層のヤング率が１５０ｋｇ／ｍｍ2以
上必要であることが認められた。The transmission loss characteristics of these small-diameter optical fibers at 1.55 μm are 0.28 dB / km in the conventional product 1,
Prototype 1 0.24 dB / km, Prototype 2 0.21 d
B / km and prototype 3 were 0.21 dB / km. From these results, it was confirmed that the Young's modulus of the secondary coating layer is required to be 150 kg / mm 2 or more in order to manufacture a low-loss thin optical fiber.
【００１３】（実施例２）図１に示すような構造を有す
る細径の１．５５μｍ帯分散シフト光ファイバを製造し
た。下記第２表に示すように、二次被覆層はヤング率が
１５０ｋｇ／ｍｍ2のＵＶ樹脂を使用し、一次被覆層は
ヤング率が異る３種類のＵＶ樹脂を用いて作製して、伝
送損失特性を比較した。またいずれも光ファイバ裸線の
外径は６０μｍとし、一次被覆層の厚さは３０μｍ、二
次被覆層の厚さは２０μｍとして、細径光ファイバの外
径は１６０μｍとした。Example 2 A small diameter 1.55 μm band dispersion shifted optical fiber having a structure as shown in FIG. 1 was manufactured. As shown in Table 2 below, the secondary coating layer is made of UV resin having a Young's modulus of 150 kg / mm 2 , and the primary coating layer is made of three kinds of UV resins having different Young's modulus, and the transmission is performed. The loss characteristics were compared. In each case, the outer diameter of the bare optical fiber was 60 μm, the thickness of the primary coating layer was 30 μm, the thickness of the secondary coating layer was 20 μm, and the outer diameter of the small-diameter optical fiber was 160 μm.
【００１４】[0014]
【表２】 [Table 2]
【００１５】これら細径光ファイバの１．５５μｍにお
ける伝送損失特性は、試作品４で０．２１ｄＢ／ｋｍ、
試作品２で０．２１ｄＢ／ｋｍ、試作品５で０．２４ｄ
Ｂ／ｋｍであった。これらの結果より、低損失な細径光
ファイバを作製するためには、一次被覆層のヤング率は
０．１ｋｇ／ｍｍ2以下が望ましいことが認められた。The transmission loss characteristics at 1.55 μm of these small-diameter optical fibers are 0.21 dB / km in prototype 4,
Prototype 2 0.21 dB / km, Prototype 5 0.24 d
B / km. From these results, it was confirmed that the Young's modulus of the primary coating layer is preferably 0.1 kg / mm 2 or less in order to manufacture a low-loss thin optical fiber.
【００１６】（実施例３）図１に示すような構造を有す
る細径の１．５５μｍ帯分散シフト光ファイバを製造し
た。下記第３表に示すように、一次被覆層および二次被
覆層の厚さを変化させて伝送損失特性を比較した。また
いずれも一次被覆層のヤング率は０．１ｋｇ／ｍｍ2、
二次被覆層のヤング率は１５０ｋｇ／ｍｍ2とした。Example 3 A small diameter 1.55 μm band dispersion shifted optical fiber having a structure as shown in FIG. 1 was manufactured. As shown in Table 3 below, the transmission loss characteristics were compared by changing the thicknesses of the primary coating layer and the secondary coating layer. The Young's modulus of the primary coating layer is 0.1 kg / mm 2 ,
The Young's modulus of the secondary coating layer was 150 kg / mm 2 .
【００１７】[0017]
【表３】 [Table 3]
【００１８】上記の結果より、細径光ファイバの光学的
特性を劣化させないためには、一次被覆層の厚さは３０
μｍ以上、二次被覆層の厚さは２０μｍ以上必要である
ことが認められた。From the above results, in order not to deteriorate the optical characteristics of the small diameter optical fiber, the thickness of the primary coating layer is 30.
It was found that the thickness of the secondary coating layer should be at least 20 μm and that of at least 20 μm.
【００１９】（実施例４）図１に示すような構造を有す
る細径の１．５５μｍ帯分散シフト光ファイバを製造し
た。下記第４表に示すようにファイバ径を変化させて伝
送損失特性を比較した。またいずれも一次被覆層のヤン
グ率は０．１ｋｇ／ｍｍ2、二次被覆層のヤング率は１
５０ｋｇ／ｍｍ2とした。Example 4 A small diameter 1.55 μm band dispersion shifted optical fiber having a structure as shown in FIG. 1 was manufactured. Transmission loss characteristics were compared by changing the fiber diameter as shown in Table 4 below. In both cases, the Young's modulus of the primary coating layer was 0.1 kg / mm 2 , and the Young's modulus of the secondary coating layer was 1
It was set to 50 kg / mm 2 .
【００２０】[0020]
【表４】 [Table 4]
【００２１】上記の結果より、細径光ファイバとして使
用に耐えうるのはファイバ径が６０μｍのものが好まし
く、ファイバ径が４０μｍ、５０μｍのものは短尺であ
れば使用可能であることが認められた。From the above results, it is recognized that a fiber having a fiber diameter of 60 μm can withstand use as a small-diameter optical fiber, and a fiber having a fiber diameter of 40 μm or 50 μm can be used if it is short. .
【００２２】（実施例５）図１に示すような構造を有す
る細径の１．５５μｍ帯分散シフト光ファイバを製造
し、これを図３に示すような従来の構造の１．５５帯分
散シフト光ファイバと融着接続して接続損失を調べた。
下記第５表に示すように、細径の１．５５μｍ帯分散シ
フト光ファイバの光ファイバ裸線の外径を変化させた。
またいずれも一次被覆層のヤング率は０．１ｋｇ／ｍｍ
2、二次被覆層のヤング率は１５０ｋｇ／ｍｍ2とした。
尚、従来の構造の１．５５帯分散シフト光ファイバのモ
ードフィールド径（以下、ＭＦＤと略記する）は８．０
μｍのものを用いた。また接続損失の測定はそれぞれ１
０本の光ファイバについて行い、平均値を求めた。(Embodiment 5) A small diameter 1.55 μm band dispersion-shifted optical fiber having a structure as shown in FIG. 1 was manufactured, and this was manufactured with a conventional structure as shown in FIG. The splice loss was investigated by fusion splicing with an optical fiber.
As shown in Table 5 below, the outer diameter of the bare optical fiber of the 1.55 μm band dispersion shifted optical fiber having a small diameter was changed.
The Young's modulus of the primary coating layer is 0.1 kg / mm in both cases.
2. The Young's modulus of the secondary coating layer was 150 kg / mm 2 .
The mode field diameter (hereinafter abbreviated as MFD) of the conventional 1.55 band dispersion shifted optical fiber is 8.0.
The thing with a micrometer was used. Also, the splice loss measurement is 1 for each.
The measurement was performed for 0 optical fibers, and the average value was obtained.
【００２３】[0023]
【表５】 上記第５表の結果から、いずれの細径光ファイバも、大
きな損失増加をまねくことなく従来の分散シフトファイ
バと接続できることが認められた。[Table 5] From the results in Table 5 above, it was confirmed that any of the small-diameter optical fibers can be connected to the conventional dispersion-shifted fiber without causing a large increase in loss.
【００２４】（実施例６）図１に示すような構造を有す
る細径の分散補償ファイバを製造した。光ファイバ裸線
の外径は６０μｍ、細径光ファイバの外径は１６０μｍ
とした。得られた細径分散補償光ファイバの光学特性は
下記第６表の通りであった。この細径分散補償光ファイ
バを用いて、＋８００ps/nm/kmの波長分散（１．３μｍ
零分散シングルモードファイバ４７ｋｍを１．５５μｍ
で使用した場合に生じる分散）を補償するためには１０
ｋｍの長さが必要である。この１０ｋｍの細径分散補償
光ファイバを、図２に示すような軸径５が６０ｍｍで、
幅６が５０ｍｍのボビンに巻回して収納しところ、ボビ
ンの鍔径７は１１０ｍｍ必要であった。Example 6 A small diameter dispersion compensating fiber having a structure as shown in FIG. 1 was manufactured. The outer diameter of bare optical fiber is 60 μm, and the outer diameter of thin optical fiber is 160 μm.
And The optical characteristics of the obtained small diameter dispersion compensating optical fiber are as shown in Table 6 below. Using this small diameter dispersion compensating optical fiber, wavelength dispersion of +800 ps / nm / km (1.3 μm
Zero dispersion single mode fiber 47km 1.55μm
10) to compensate for the dispersion that occurs when used in
A length of km is required. This 10 km thin dispersion compensation optical fiber has a shaft diameter 5 of 60 mm as shown in FIG.
When the bobbin was wound around a bobbin having a width 6 of 50 mm for storage, the collar diameter 7 of the bobbin was required to be 110 mm.
【００２５】（比較例１）図３に示すような従来の構造
を有する分散補償ファイバを製造した。光ファイバ裸線
の外径は１２５μｍ、光ファイバの外径は２５０μｍと
した。得られた分散補償光ファイバの光学特性は下記第
６表の通りであった。この分散補償光ファイバ１０ｋｍ
を、上記実施例６と同様のボビンに巻回して収納しとこ
ろ、ボビンの鍔径７は１５０ｍｍ必要であった。Comparative Example 1 A dispersion compensating fiber having a conventional structure as shown in FIG. 3 was manufactured. The outer diameter of the bare optical fiber was 125 μm, and the outer diameter of the optical fiber was 250 μm. The optical characteristics of the obtained dispersion compensating optical fiber are shown in Table 6 below. This dispersion compensating optical fiber 10km
Was wound around a bobbin similar to that in Example 6 and stored, and the bobbin collar diameter 7 was required to be 150 mm.
【００２６】[0026]
【表６】 [Table 6]
【００２７】上記実施例６および比較例１の結果より、
実施例６の細径分散補償光ファイバは、従来の分散補償
光ファイバと同様の特性を有し、従来のものより小さな
スペースに収納することができることが認められた。ま
た、光ファイバ裸線が従来のものよりも細く、許容曲げ
半径が小さいので、細径光ファイバの曲げ損失を考慮し
ながら、ボビンの軸径をさらに小さくすることも可能で
ある。From the results of Example 6 and Comparative Example 1 above,
It was confirmed that the small-diameter dispersion compensating optical fiber of Example 6 has the same characteristics as the conventional dispersion compensating optical fiber and can be stored in a space smaller than the conventional one. Further, since the bare optical fiber is thinner than the conventional one and the allowable bending radius is small, it is possible to further reduce the shaft diameter of the bobbin while considering the bending loss of the thin optical fiber.
【００２８】（実施例７）図１に示すような構造を有す
る細径のエルビウム添加光ファイバを製造した。光ファ
イバ裸線の外径は６０μｍ、細径光ファイバの一次被覆
径は１２０μｍ、二次被覆径は１６０μｍとした。また
一次被覆層のＵＶ樹脂のヤング率は０．１ｋｇ／ｍ
ｍ2、二次被覆層のＵＶ樹脂のヤング率は１５０ｋｇ／
ｍｍ2とした。得られた細径エルビウム添加光ファイバ
を光増幅器内で使用するためにボビンに巻き込んだ。ボ
ビンの軸径すなわちファイバの最小巻き直径を３０ｍｍ
としても十分な長期信頼性が得られた。Example 7 A small-diameter erbium-doped optical fiber having a structure as shown in FIG. 1 was manufactured. The outer diameter of the bare optical fiber was 60 μm, the primary coating diameter of the small-diameter optical fiber was 120 μm, and the secondary coating diameter was 160 μm. The Young's modulus of the UV resin of the primary coating layer is 0.1 kg / m
m 2 , the Young's modulus of the UV resin of the secondary coating layer is 150 kg /
It was set to mm 2 . The resulting small diameter erbium-doped optical fiber was wound on a bobbin for use in an optical amplifier. The bobbin shaft diameter, that is, the minimum winding diameter of the fiber is 30 mm.
As a result, sufficient long-term reliability was obtained.
【００２９】（比較例２）上記実施例７と同様の中間母
材を用いて、ＭＦＤ、λｃが同一になるように外付けを
行い、図３に示すような従来の構造を有するエルビウム
添加光ファイバを製造した。このとき一次被覆層のヤン
グ率は０．１ｋｇ／ｍｍ2、二次被覆層のヤング率は５
０ｋｇ／ｍｍ2とした。このエルビウム添加光ファイバ
を光増幅器内で使用するためにボビンに巻き込んだ。実
施例７と同様な長期信頼性を得るためには、ファイバの
最小巻き直径は６２．５ｍｍ必要であった。上記実施例
７および比較例２の結果より、実施例７のエルビウム添
加光ファイバは、従来のものより軸径が小さなボビンに
巻き込んで使用することができるので、光部品における
収納効率を向上できることが認められた。また、増幅特
性については、ファイバ径の細径化による劣化は認めら
れなかった。(Comparative Example 2) An erbium-doped light having a conventional structure as shown in FIG. 3 was prepared by using an intermediate base material similar to that of Example 7 and externally mounting it so that MFD and λc were the same. A fiber was manufactured. At this time, the Young's modulus of the primary coating layer was 0.1 kg / mm 2 , and the Young's modulus of the secondary coating layer was 5
It was set to 0 kg / mm 2 . The erbium-doped optical fiber was wound on a bobbin for use in an optical amplifier. To obtain long-term reliability similar to that of Example 7, the minimum winding diameter of the fiber was 62.5 mm. From the results of Example 7 and Comparative Example 2 described above, the erbium-doped optical fiber of Example 7 can be used by being wound around a bobbin having a smaller shaft diameter than conventional ones, and thus the storage efficiency in optical components can be improved. Admitted. As for the amplification characteristic, no deterioration due to the reduction of the fiber diameter was observed.
【００３０】[0030]
【発明の効果】以上説明したように本発明の細径光ファ
イバによれば、光ファイバ裸線の外径を従来の１２５μ
ｍより細くすることによって、細径の光ファイバが得ら
れ、収納効率を向上させることができるとともに、許容
曲げ半径を小さくすることができる。また、光ファイバ
裸線の周上に低ヤング率の一次被覆層と高ヤング率の二
次被覆層を設けることによって、マイクロベンドによる
長波長側の大きな伝送損失の増加を抑えることができる
ので、伝送特性が良好な細径光ファイバを得ることがで
きる。さらに本発明の細径光ファイバの構造を用いて細
径の分散補償光ファイバを形成すると、分散補償光ファ
イバを小さなボビンに収納することができるので、機器
内への収納効率を向上できる。また本発明の細径光ファ
イバの構造を用いて細径の希土類添加光ファイバを形成
することにより、許容曲げ半径が小さな希土類添加光フ
ァイバが得られ、光増幅器などの部品内に効率よく収納
できる。As described above, according to the small diameter optical fiber of the present invention, the outer diameter of the bare optical fiber is 125 μm as compared with the conventional optical fiber.
By making the diameter smaller than m, an optical fiber having a small diameter can be obtained, the storage efficiency can be improved, and the allowable bending radius can be reduced. Further, by providing a low Young's modulus primary coating layer and a high Young's modulus secondary coating layer on the circumference of the bare optical fiber, it is possible to suppress an increase in large transmission loss on the long wavelength side due to microbending. It is possible to obtain a small-diameter optical fiber having excellent transmission characteristics. Furthermore, when a dispersion compensation optical fiber having a small diameter is formed by using the structure of the small diameter optical fiber of the present invention, the dispersion compensation optical fiber can be accommodated in a small bobbin, so that the efficiency of accommodation in the device can be improved. Further, by forming a small-diameter rare earth-doped optical fiber using the structure of the small-diameter optical fiber of the present invention, a rare earth-doped optical fiber having a small allowable bending radius can be obtained and can be efficiently housed in components such as optical amplifiers. .
【図１】 本発明の細径光ファイバの例を示す断面図で
ある。FIG. 1 is a cross-sectional view showing an example of a small diameter optical fiber of the present invention.
【図２】 ボビンの例を示す斜視図である。FIG. 2 is a perspective view showing an example of a bobbin.
【図３】 従来の光ファイバの例を示す断面図である。FIG. 3 is a sectional view showing an example of a conventional optical fiber.
１……細径光ファイバ、２……光ファイバ裸線、３……
一次被覆層、４……二次被覆層1 ... small diameter optical fiber, 2 ... bare optical fiber, 3 ...
Primary coating layer, 4 ... Secondary coating layer
Claims (1)
裸線の周上に、ヤング率０．１ｋｇ／ｍｍ2以下の一次
被覆層を有し、該一次被覆層の周上にヤング率１５０ｋ
ｇ／ｍｍ2以上の二次被覆層を有することを特徴とする
細径光ファイバ。1. A primary coating layer having a Young's modulus of 0.1 kg / mm 2 or less is provided on the circumference of an optical fiber bare wire having an outer diameter of less than 125 μm, and a Young's modulus of 150 k is provided on the circumference of the primary coating layer.
A small-diameter optical fiber having a secondary coating layer of g / mm 2 or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6188635A JPH0854546A (en) | 1994-08-10 | 1994-08-10 | Small diameter optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6188635A JPH0854546A (en) | 1994-08-10 | 1994-08-10 | Small diameter optical fiber |
Related Child Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002380036A Division JP2003202467A (en) | 2002-12-27 | 2002-12-27 | Small diameter optical fiber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0854546A true JPH0854546A (en) | 1996-02-27 |
Family
ID=16227160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6188635A Pending JPH0854546A (en) | 1994-08-10 | 1994-08-10 | Small diameter optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0854546A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000041011A1 (en) * | 1999-01-06 | 2000-07-13 | Sumitomo Electric Industries, Ltd. | Dispersion compensating optical fiber |
| US6546180B1 (en) | 1999-01-06 | 2003-04-08 | Sumitomo Electric Industries, Ltd. | Coiled optical assembly and fabricating method for the same |
| US6650821B1 (en) | 1999-01-06 | 2003-11-18 | Sumitomo Electric Industries, Ltd. | Optical device and a making method thereof |
| JP2006520015A (en) * | 2003-03-07 | 2006-08-31 | ブリティッシュ・テレコミュニケーションズ・パブリック・リミテッド・カンパニー | Fiber optic cable and spray installation technology |
| JP2006522366A (en) * | 2003-04-01 | 2006-09-28 | コーニング・インコーポレーテッド | Rare earth doped fiber coil with reduced cladding diameter and optical amplifier using the same |
| CN1300610C (en) * | 2002-03-13 | 2007-02-14 | 株式会社藤仓 | Dispersion compensating optical fiber |
| JP2020091397A (en) * | 2018-12-05 | 2020-06-11 | 住友電気工業株式会社 | Optical fiber cable, and method and apparatus for manufacturing optical fiber cable |
-
1994
- 1994-08-10 JP JP6188635A patent/JPH0854546A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000041011A1 (en) * | 1999-01-06 | 2000-07-13 | Sumitomo Electric Industries, Ltd. | Dispersion compensating optical fiber |
| US6546180B1 (en) | 1999-01-06 | 2003-04-08 | Sumitomo Electric Industries, Ltd. | Coiled optical assembly and fabricating method for the same |
| US6650821B1 (en) | 1999-01-06 | 2003-11-18 | Sumitomo Electric Industries, Ltd. | Optical device and a making method thereof |
| US7043131B2 (en) | 1999-01-06 | 2006-05-09 | Sumitomo Electric Industries, Ltd. | Optical device and a making method thereof |
| CN1300610C (en) * | 2002-03-13 | 2007-02-14 | 株式会社藤仓 | Dispersion compensating optical fiber |
| US7233728B2 (en) | 2002-03-13 | 2007-06-19 | Fujikura Ltd. | Dispersion compensating optical fiber |
| JP2006520015A (en) * | 2003-03-07 | 2006-08-31 | ブリティッシュ・テレコミュニケーションズ・パブリック・リミテッド・カンパニー | Fiber optic cable and spray installation technology |
| JP2006522366A (en) * | 2003-04-01 | 2006-09-28 | コーニング・インコーポレーテッド | Rare earth doped fiber coil with reduced cladding diameter and optical amplifier using the same |
| JP2020091397A (en) * | 2018-12-05 | 2020-06-11 | 住友電気工業株式会社 | Optical fiber cable, and method and apparatus for manufacturing optical fiber cable |
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