JPH0810283B2 - Fiber for optical transmission - Google Patents
Fiber for optical transmissionInfo
- Publication number
- JPH0810283B2 JPH0810283B2 JP59031484A JP3148484A JPH0810283B2 JP H0810283 B2 JPH0810283 B2 JP H0810283B2 JP 59031484 A JP59031484 A JP 59031484A JP 3148484 A JP3148484 A JP 3148484A JP H0810283 B2 JPH0810283 B2 JP H0810283B2
- Authority
- JP
- Japan
- Prior art keywords
- fiber
- bunch
- core
- present
- glass
- 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 - Lifetime
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/04—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/04—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres
- G02B6/06—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings formed by bundles of fibres the relative position of the fibres being the same at both ends, e.g. for transporting images
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
Description
【発明の詳細な説明】 本発明は光伝送用ガラスフアイバー（以下光フアイバ
という）に関し、特に２本以上の光フアイバを束ねて、
直接最外層のガラスを互に融着せしめ、小さな断面で大
量の情報を送ることのできるパンチフアイバに関する。Description: TECHNICAL FIELD The present invention relates to a glass fiber for optical transmission (hereinafter referred to as “optical fiber”), and in particular, by bundling two or more optical fibers,
The present invention relates to a punch fiber capable of directly transmitting a large amount of information with a small cross section by directly fusing the outermost glass layers to each other.
（従来技術） １つの地点から複数地点への光フアイバーによる情報
伝送のためには、１本の光フアイバーで情報を送り分
岐用機器で分岐する、光フアイバーを複数本束ねてケ
ーブルとし、その光フアイバーを分岐する、という２つ
の方法がある。の分岐用機器は高価である上に、１本
の光フアイバでは情報伝送容量にも限度がある。(Prior Art) For information transmission by an optical fiber from one point to a plurality of points, information is sent by one optical fiber and branched by a branching device. A plurality of optical fibers are bundled into a cable, and the optical fiber There are two ways to branch the fiber. The branching device is expensive, and the information transmission capacity is limited by one optical fiber.
したがつての方法の方が望ましく、そのためには当
然光フアイバを束ねることが必要となるが、被覆した光
フアイバを束ねると、光フアイバ心線は直径0.9mm位又
素線でも直径0.4mm位あるため、光フアイバそのものの
直径0.125mmに比べるとはるかに断面積が大きくなつて
しまう。Therefore, it is necessary to bunch the optical fibers for that method, but if the coated optical fibers are bundled, the optical fiber core wire has a diameter of about 0.9 mm or even a bare wire of about 0.4 mm. Therefore, the cross-sectional area becomes much larger than the diameter of the optical fiber itself, which is 0.125 mm.
しかし、断面積を小さくするように被覆のない光フア
イバを直接束ねた従来のバンチフアイバでは、表面に傷
がつき折れやすくなつてしまう欠点があつた。However, the conventional bunch fiber in which the uncoated optical fibers are directly bundled so as to reduce the cross-sectional area has a defect that the surface is scratched and easily broken.
そこで１本の光フアイバ中に２以上のコアを形成して
なるマルチコアフアイバが考えられたが、このマルチコ
アフアイバの各コアにて送られる信号を、別々に取り出
すことは非常に困難である。Therefore, a multi-core fiber in which two or more cores are formed in one optical fiber has been considered, but it is very difficult to separately take out the signals sent by each core of the multi-core fiber.
又、光フアイバを束ねて直接融着したバンチフアイバ
の場合もマルチコアフアイバと同様に各コアの信号を別
々に取り出すことに困難があつた。Also, in the case of a bunch fiber in which optical fibers are bundled and directly fused, it is difficult to take out the signals of each core separately as in the multi-core fiber.
さらに従来知られているバンチフアイバは、フツ酸を
使用して光フアイバの束を溶解分解する方法が知られて
いるが、フツ酸の場合はバンチフアイバのクラツド部を
溶解するものであるため、伝送特性上好ましくない問題
を生じることもあつた。Furthermore, in the conventionally known bunch fibre, a method of dissolving and decomposing a bundle of optical fibers by using hydrofluoric acid is known, but in the case of hydrofluoric acid, the clad portion of the bunch fiber is dissolved, so that the transmission characteristics In some cases, this may cause unfavorable problems.
（発明の目的） 本発明は以上の困難を解決して、小さな断面で大量の
情報を送ることのできるバンチフアイバであつて、クラ
ツドを溶解させることなくフアイバの分離が簡単にすみ
やかに行え、光伝送特性も損なわないようなバンチフア
イバを提供することを目的とするものである。(Object of the invention) The present invention is a bunch fiber capable of transmitting a large amount of information with a small cross section by solving the above-mentioned difficulties, and the fiber can be easily and promptly separated without melting the cladding, and optical transmission can be performed. The object is to provide a bunch fiber that does not impair the characteristics.
（発明の構成） 本発明者らは、Na2O，Li2O等のアルカリ金属類又はB2
O3，P2O5等のドーパントを1mol％以上添加したSiO2のよ
うに、純石英（SiO2）にくらべて、充分速やかに酸に溶
解するガラスをその最外表面に有するガラス光フアイバ
を直接融着して、バンチフアイバケーブルとすることに
より、上記の目的を達成し得ることを見出し本発明に到
つた。(Structure of the Invention) The present inventors have investigated alkali metals such as Na 2 O and Li 2 O or B 2
A glass optical fiber that has a glass on its outermost surface that dissolves in acid much faster than pure quartz (SiO 2 ), such as SiO 2 containing 1 mol% or more of a dopant such as O 3 and P 2 O 5. The inventors have found that the above object can be achieved by directly fusing the above to form a bunch fiber cable, and have reached the present invention.
すなわち本発明は、コア、該コアをとりまくクラツ
ド、及び酸によつて鈍SiO2よりも充分速く溶解し、アル
カリ金属酸化物又はB2O3，P2O5のいずれかを1mol％以上
添加したSiO2よりなるガラスの最外層からなるガラスフ
アイバを２本以上束ねて融着してなる石英を主成分とす
る光伝送用フアイバを提供するものである。That is, the present invention, the core, the cladding surrounding the core, and dissolved by acid sufficiently faster than blunt SiO 2 , the addition of alkali metal oxide or B 2 O 3 , P 2 O 5 1mol% or more The present invention provides an optical transmission fiber containing quartz as a main component, which is obtained by bundling and fusing two or more glass fibers made of the outermost layer of glass made of SiO 2 .
本発明を図面に基いて具体的に説明する。 The present invention will be specifically described with reference to the drawings.
第１図は本発明のバンチフアイバを構成する単心フア
イバの断面図であつて、１はコア、２はクラツド、３は
SiO2にくらべて、酸による溶解速度が充分に大であるガ
ラス層、４は単心フアイバを示している。FIG. 1 is a sectional view of a single-core fiber constituting the bunch fiber of the present invention, in which 1 is a core, 2 is a cladding, and 3 is
Glass layers 4 having a sufficiently high acid dissolution rate as compared with SiO 2 show single-core fibers.
第２図は本発明のバンチフアイバの一実施態様例を示
す図であつて、図の番号１〜３は第１図に示すものと同
様であり、第１図の単心フアイバ４を複数本束ね互に融
着しバンチフアイバ５としたものである。FIG. 2 is a diagram showing an embodiment of the bunch fiber of the present invention. Numbers 1 to 3 in the figure are the same as those shown in FIG. 1, and a plurality of single-core fibers 4 shown in FIG. 1 are bundled. They are fused with each other to form a bunch fiber 5.
純石英にくらべ充分速やかに酸に溶解するガラスとし
ては、Na2O，LiO2等のアルカリ金属類又はB2O3，P2O5等
のドーパントを1mol％以上添加したSiO2よりなるガラス
等が挙げられる。As a glass that dissolves in an acid sufficiently faster than pure quartz, a glass made of SiO 2 to which an alkali metal such as Na 2 O or LiO 2 or a dopant such as B 2 O 3 or P 2 O 5 is added at 1 mol% or more. Etc.
本発明のバンチフアイバケーブルにおいては、所望の
分岐場所でバンチフアイバをケーブルから取り出し、酸
に浸すことにより、フアイバの最外層が溶解し、融着し
ていた単心のフアイバを容易に分離できる。従来のバン
チフアイバについては、既述のようにフツ酸を使用して
溶解、分離するものが知られているが、フツ酸の場合は
バンチフアイバのクラツド部を溶解させるものであり、
伝送特性上問題の生じることがあつた。本発明のバンチ
フアイバは、クラツドのSiO2より酸に溶けやすいガラス
を最外層に有するため、クラツドを溶解させることなく
すみやかに分離することができ、かつ伝送損失の増大も
ない。In the bunch fiber of the present invention, the bunch fiber is taken out from the cable at a desired branching position and immersed in an acid, whereby the outermost layer of the fiber is dissolved and the fused single-core fiber can be easily separated. Regarding the conventional bunch fiiva, it is known to dissolve and separate using hydrofluoric acid as described above, but in the case of hydrofluoric acid, the clad portion of bunch fiiva is dissolved.
This may cause problems in transmission characteristics. Since the outermost layer of the bunch fiber of the present invention has a glass that is easier to dissolve in acid than SiO 2 of the cladding, it can be quickly separated without melting the cladding, and the transmission loss does not increase.
この溶解はフアイバ端面で行つてもよいし、必要なら
ばフアイバ端面よりも内側の１部を溶解し、数本のフア
イバを切断して単心のフアイバと接続し、残りのフアイ
バは一括してバンチフアイバと接続することも可能であ
る。This melting may be performed at the fiber end surface, or if necessary, melt a part inside the fiber end surface, cut several fibers and connect them to a single fiber, and the remaining fibers at once. It is also possible to connect with a bunch-huiva.
本発明のバンチフアイバの溶解に用いる酸としては、
濃塩酸、濃硫酸、濃硝酸等が使用できる。Examples of the acid used for dissolving bunch fiber of the present invention include:
Concentrated hydrochloric acid, concentrated sulfuric acid, concentrated nitric acid, etc. can be used.
以下、実施例により本発明の方法とその効果を示す。 Hereinafter, the method of the present invention and its effect will be shown by examples.
実施例１ 気相軸付け法（VAD法）により製造したグレーデイツ
ドインデツクス（GI）型光フアイバ用ガラス母材に石英
管を被せ常法により一体化してコア及びクラツドを持つ
プリフオームとした後に、SiCl4 400cc/分、POCl3 400c
c/分、BBr3 200cc/分、H2 4l/分、O2 10l/分をトーチか
ら吹き出して、火炎加水分解法により、該プリフオーム
外周にガラス微粒子を付着堆積し、更にHe雰囲気中で加
熱透明化した。この工程によつて上記プリフオームの外
周にはP2O5が多量にドープされたSiO2層が約0.5mmの厚
さで形成された。Example 1 After forming a preform having a core and a cladding by covering a glass tube for a graded index (GI) type optical fiber manufactured by a vapor phase axial method (VAD method) with a quartz tube and integrating it by a conventional method , SiCl 4 400cc / min, POCl 3 400c
C / min, BBr 3 200 cc / min, H 2 4 l / min, O 2 10 l / min were blown out from the torch, glass particles were adhered and deposited on the periphery of the preform by flame hydrolysis method, and further heated in He atmosphere. It became transparent. By this step, a SiO 2 layer heavily doped with P 2 O 5 was formed on the outer periphery of the preform with a thickness of about 0.5 mm.
このようにコア、クラツド及び最外層にP2O5を多く含
むSiO2層よりなるプリフオームを７本束ねて一括線引き
を行つた結果、第２図に示すような断面をもつ、直径0.
3mmのバンチフアイバを得た。As a result of bundling seven preforms consisting of a SiO 2 layer containing a large amount of P 2 O 5 in the core, the cladding, and the outermost layer, and performing batch drawing, the cross section as shown in FIG.
I got a 3mm bunch huiba.
このフアイバを濃塩酸に20分間浸すことにより、７本
の単心フアイバを簡単に分離することができた。この分
離によつてフアイバ強度の劣化や、伝送損失の増加はみ
られなかつた。By immersing this fiber in concentrated hydrochloric acid for 20 minutes, seven single-fibers could be easily separated. Due to this separation, neither deterioration of fiber strength nor increase of transmission loss was observed.
実施例２ 内付けCVD法（MCVD法）で製造したGI型フアイバ母材
に対し、SiCl4 400cc/分、BBr3 200cc/分、H2 4l/分、O
2 10l/分をトーチから吹き出させ、火炎加水分解法でガ
ラス微粒子をこのプリフオーム外周に付着させると同時
に霧状にした10％NaNO3水溶液を10cc/分でプリフオーム
外周に吹き着け、さらにHe雰囲気中で加熱透明化した。
その結果、プリフオームの外周にB2O3とNa2Oのドープさ
れたSiO2層が約0.1mmの厚さで形成された。このプリフ
オームを一列に並べて一括線引をおこなつた。その結
果、第３図に示すような断面構造のバンチフアイバが得
られた。図中の番号１〜3,5の意味するところは第２図
と同じである。このフアイバを濃硫酸に10分間浸すと、
４本のフアイバを分離することができた。この分離によ
つてフアイバ強度の劣化や、伝送損失の増加はみられな
かつた。Example 2 SiCl 4 400 cc / min, BBr 3 200 cc / min, H 2 4 l / min, O with respect to the GI type fiber base material produced by the internal CVD method (MCVD method)
2 10 l / min was blown out from the torch, and glass particles were attached to the outer periphery of the preform by the flame hydrolysis method, and at the same time atomized 10% NaNO 3 aqueous solution was blown onto the outer periphery of the preform at 10 cc / min. It became transparent by heating.
As a result, a SiO 2 layer doped with B 2 O 3 and Na 2 O was formed with a thickness of about 0.1 mm on the outer periphery of the preform. The preforms were lined up in a line and drawn together. As a result, a bunch fiber having a sectional structure as shown in FIG. 3 was obtained. The meanings of the numbers 1 to 3 and 5 in the figure are the same as those in FIG. Soaking this fiber in concentrated sulfuric acid for 10 minutes,
Four fibers could be separated. Due to this separation, neither deterioration of fiber strength nor increase of transmission loss was observed.
第２図及び第３図は本発明の実施態様例を示するので
あるが、本発明はこれらの構造に限定されるものではな
いことは言うまでもない。2 and 3 show exemplary embodiments of the present invention, it goes without saying that the present invention is not limited to these structures.
（発明の効果） 本発明の効果は上記実施例に述べたとおりであるが、
従来の最外層に純シリカ層を持つバンチフアイバでは、
濃塩酸に24時間以上浸しても単心フアイバを分離できな
いし、フツ酸に浸した場合でも分離には２時間以上と本
発明の数倍の時間を要し、その上に分離後のフアイバ強
度は非常に劣化し、又、伝送損失の増加も著しい。この
事実からも、本発明の優れた効果が理解できると言えよ
う。(Effect of the invention) The effect of the present invention is as described in the above embodiment,
In the conventional bunch huiba with a pure silica layer as the outermost layer,
Single core fibers cannot be separated even if soaked in concentrated hydrochloric acid for 24 hours or more, and even if soaked in hydrofluoric acid, the separation takes 2 hours or more, which is several times longer than that of the present invention. Is significantly deteriorated and the transmission loss is significantly increased. From this fact, it can be said that the excellent effect of the present invention can be understood.
第１図は本発明のバンチフアイバを構成する単心フアイ
バの構造を示し、第２図は本発明のバンチフアイバの一
実施態様例の構造を示し、そして第３図は本発明のバン
チフアイバの別の実施態様例の構造を示す。FIG. 1 shows the structure of a single-core fiber which constitutes the bunch fiber of the present invention, FIG. 2 shows the structure of an embodiment of the bunch fiber of the present invention, and FIG. 3 shows another embodiment of the bunch fiber of the present invention. The structure of the example of an aspect is shown.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 前川 英二 茨城県那珂郡東海村大字白方字白根162番 地 日本電信電話公社茨城電気通信研究所 内 (56)参考文献 特開 昭56−70510（ＪＰ，Ａ) 特開 昭51−39059（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Eiji Maekawa 162 Shirahone, Shirahoji, Tokai-mura, Naka-gun, Ibaraki Prefecture, Japan Ibaraki Telecommunications Research Institute, Nippon Telegraph and Telephone Corporation (56) Reference JP-A-56-70510 ( JP, A) JP 51-39059 (JP, A)
Claims (1)
によつて純SiO2よりも充分速く溶解し、アルカリ金属酸
化物又はB2O3，P2O5のいずれかを1mol％以上添加したSi
O2よりなるガラスの最外層からなるガラスフアイバを２
本以上束ねて融着してなる石英を主成分とする光伝送用
フアイバ。1. A core, a cladding surrounding the core, and an acid are dissolved sufficiently faster than pure SiO 2, and an alkali metal oxide or one of B 2 O 3 and P 2 O 5 is added at 1 mol% or more. Made Si
2 glass fibers consisting of the outermost layer of glass consisting of O 2.
A fiber for optical transmission mainly composed of fused and fused quartz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59031484A JPH0810283B2 (en) | 1984-02-23 | 1984-02-23 | Fiber for optical transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59031484A JPH0810283B2 (en) | 1984-02-23 | 1984-02-23 | Fiber for optical transmission |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60176004A JPS60176004A (en) | 1985-09-10 |
| JPH0810283B2 true JPH0810283B2 (en) | 1996-01-31 |
Family
ID=12332538
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59031484A Expired - Lifetime JPH0810283B2 (en) | 1984-02-23 | 1984-02-23 | Fiber for optical transmission |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0810283B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DK3276384T3 (en) | 2015-03-25 | 2022-06-13 | Sumitomo Electric Industries | OPTICAL MULTI-CORNER FIBER |
| JP6668833B2 (en) | 2016-03-09 | 2020-03-18 | 住友電気工業株式会社 | Coupled multi-core optical fiber |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5139059A (en) * | 1974-09-27 | 1976-04-01 | Olympus Optical Co | Kogakusenitaba no seiho |
| JPS5670510A (en) * | 1979-11-14 | 1981-06-12 | Olympus Optical Co Ltd | Manufacture of optical view tube |
-
1984
- 1984-02-23 JP JP59031484A patent/JPH0810283B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60176004A (en) | 1985-09-10 |
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