JP3198457B2 - Optical fiber with optical attenuator and directional optical fiber - Google Patents
Optical fiber with optical attenuator and directional optical fiberInfo
- Publication number
- JP3198457B2 JP3198457B2 JP24656696A JP24656696A JP3198457B2 JP 3198457 B2 JP3198457 B2 JP 3198457B2 JP 24656696 A JP24656696 A JP 24656696A JP 24656696 A JP24656696 A JP 24656696A JP 3198457 B2 JP3198457 B2 JP 3198457B2
- Authority
- JP
- Japan
- Prior art keywords
- optical
- core
- optical fiber
- attenuator
- optical attenuator
- 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
Landscapes
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Light Guides In General And Applications Therefor (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、光通信，光計測，
ＣＡＴＶシステム等の分野において光信号を減衰させる
ために使用される光減衰器入り光ケーブルおよび方向性
光ケーブルに関するものである。The present invention relates to optical communication, optical measurement,
To an optical attenuator containing cable and directionality optical cable that are used to attenuate the optical signals in the fields such as CATV systems.
【０００２】[0002]
【従来の技術】図１１は、従来の光減衰器の一例を示す
断面図である。この光減衰器５００は、コア部５２ａを
クラッド部５３ａで囲んだ構造の光ファイバ５１ａの端
面と，コア部５２ｂをクラッド部５３ｂで囲んだ構造の
光ファイバ５１ｂの端面とを、コア径や所望の減衰量に
応じて決定されたずれ量Ｌ’だけ光軸をずらせて突き合
せ、接合したものである。前記接合には、アーク放電が
利用される。アーク放電の処理時間は、例えば３秒間程
度である。2. Description of the Related Art FIG. 11 is a sectional view showing an example of a conventional optical attenuator. In this optical attenuator 500, the end face of the optical fiber 51a having a structure in which the core portion 52a is surrounded by the clad portion 53a and the end surface of the optical fiber 51b having the structure in which the core portion 52b is surrounded by the clad portion 53b are formed by a core diameter The optical axes are shifted and shifted by an amount of displacement L ′ determined according to the amount of attenuation of the optical fibers and joined. An arc discharge is used for the joining. The processing time of the arc discharge is, for example, about 3 seconds.
【０００３】[0003]
【発明が解決しようとする課題】上記従来の光減衰器５
００では、光ファイバ５３ａと光ファイバ５３ｂとの接
合部でコア部５１ａ（または５１ｂ）とクラッド部５２
ｂ（または５２ａ）が直に接合する接合面が形成される
ので、その接合面で導波光が入射側へ反射されることと
なり、反射率を十分に低減することが難しい問題点があ
る。なお、反射率が大きいと、レーザ発振器などの光発
振器に導波光が戻されて発振が不安定となったり、雑音
が増加したりする不都合を生じる。また、光軸のずれ量
Ｌ’によって減衰量が決まるが、もともとコア部５１
ａ，５１ｂの径が小さいため、ずれ量Ｌ’のわずかな誤
差でも減衰量が大きく変わり、減衰量の精度を得にくい
問題点がある。また、光軸ずれを生じさせたことにより
接合面で段差が生じる結果、当該部分をコネクタ内に収
容することが困難になる問題点がある。そこで、本発明
の目的は、導波光の反射率を十分に低減でき、しかも、
減衰量の精度を高くでき、さらに段差部分を生じさせな
い光減衰器入り光ケーブルおよび方向性光ケーブルを提
供することにある。The above-mentioned conventional optical attenuator 5
At 00, the core 51a (or 51b) and the clad 52 are joined at the joint between the optical fiber 53a and the optical fiber 53b.
Since a bonding surface where b (or 52a) is directly bonded is formed, the guided light is reflected to the incident side at the bonding surface, and there is a problem that it is difficult to sufficiently reduce the reflectance. If the reflectivity is large, the waveguided light is returned to an optical oscillator such as a laser oscillator, and the oscillation becomes unstable or the noise increases. Further, the amount of attenuation is determined by the amount of displacement L 'of the optical axis.
Since the diameters of a and 51b are small, even a slight error in the displacement L ′ greatly changes the attenuation, and it is difficult to obtain the accuracy of the attenuation. In addition, as a result of the occurrence of the optical axis shift, a step is generated on the joint surface, so that it is difficult to accommodate the portion in the connector. Therefore, an object of the present invention is to sufficiently reduce the reflectance of guided light, and
The precision of the amount of attenuation can be increased, and no step
It is an object of the present invention to provide an optical cable with an optical attenuator and a directional optical cable.
【０００４】第１の観点では、本発明は、光ファイバの
数箇所の部分のコア部を拡径し、そのコア拡径部分を透
過する導波光を当該部分で拡散させて減衰させるように
した光減衰器を、光ファイバの第１端および第２端から
それぞれ３ｃｍ未満で略対称な位置に設けたことを特徴
とする光減衰器入り光ファイバを提供する。上記第１の
観点による光減衰器入り光ファイバの光減衰器では、コ
ア部を拡径した部分で導波光がクラッド部へ入る角度が
急になるため、クラッド部への導波光の漏洩が起こりや
すくなる。そして、光はクラッド部を透過しにくいた
め、当該コア拡径部から光ファイバの端部までの距離が
大きいと、漏洩した光は、ほとんど端部に届かなくな
る。すなわち、クラッド部へ漏洩した分だけ光が減衰す
ることとなり、光減衰器として機能する。また、コア部
を拡径する程度を制御することにより減衰量を容易に調
整できるから、減衰量の精度を高くできる。また、コア
部を拡径するだけなので、入射側への反射は起りにく
く、反射率を小さくできる。さらに、従来のような段差
が生じないため、当該部分をコネクタ内に収容できるよ
うになる。[0004] In a first aspect, the invention relates to an optical fiber .
An optical attenuator in which the core portion of several portions is expanded in diameter and the guided light transmitted through the core expanded portion is diffused and attenuated by the portion is provided from the first end and the second end of the optical fiber. Provided are optical fibers with an optical attenuator, each of which is provided at a substantially symmetrical position with a length of less than 3 cm. In the optical attenuator of the optical fiber with the optical attenuator according to the first aspect, since the angle at which the guided light enters the clad at the portion where the diameter of the core is expanded becomes steep, the leakage of the guided light to the clad occurs. It will be easier. Since the light hardly passes through the clad portion, if the distance from the core enlarged portion to the end of the optical fiber is large, the leaked light hardly reaches the end. That is, the light is attenuated by the amount leaked to the clad portion, and functions as an optical attenuator. Further, the attenuation can be easily adjusted by controlling the degree to which the diameter of the core portion is expanded, so that the accuracy of the attenuation can be increased. Further, since the diameter of the core portion is merely increased, reflection on the incident side hardly occurs, and the reflectance can be reduced. Further, since there is no step as in the related art, the portion can be accommodated in the connector.
【０００５】また、上記第１の観点による光減衰器入り
光ファイバでは、第１端から入射した導波光は第１端の
近傍のコア拡径部分でクラッド部へ漏洩するが、そこか
ら第２端までの距離が大きいため、漏洩した光は、ほと
んど第２端に届かなくなる。他方、第２端から入射した
導波光は第２端の近傍のコア拡径部分でクラッド部へ漏
洩するが、そこから第１端までの距離が大きいため、漏
洩した光は、ほとんど第１端に届かなくなる。すなわ
ち、第１端から第２端へ向かう導波光もその逆方向の導
波光もクラッド部へ漏洩した分だけ減衰することとな
り、無方向性の光減衰器として機能する。 The optical attenuator according to the first aspect is provided.
In an optical fiber, the guided light incident from the first end is
Leakage into the cladding at the core diameter enlargement near it.
Because the distance from the end to the second end is large, the leaked light is almost
It will almost never reach the second end. On the other hand, incident from the second end
The guided light leaks into the cladding at the core enlarged portion near the second end.
Leaks, but the distance from it to the first end is large,
The leaked light hardly reaches the first end. Sand
That is, the guided light traveling from the first end to the second end is also guided in the opposite direction.
Wave light is also attenuated by the amount leaked to the cladding.
Function as a non-directional optical attenuator.
【０００６】第２の観点では、本発明は、光ファイバの
１箇所または数箇所の部分のコア部を拡径し、そのコア
拡径部分を透過する導波光を当該部分で拡散させて減衰
させるようにした光減衰器を、光ファイバの第１端から
３ｃｍ未満のみに設けたことを特徴とする方向性光ファ
イバを提供する。上記第２の観点による方向性光ファイ
バでは、第１端から入射した導波光は第１端の近傍のコ
ア拡径部分でクラッド部へ漏洩するが、そこから第２端
までの距離が大きいため、漏洩した光は、ほとんど第２
端に届かなくなる。他方、第２端から入射した導波光は
前記第１端の近傍のコア拡径部分でクラッド部へ漏洩す
るが、そこから第１端までの距離が小さいため、漏洩し
た光は、大部分が第１端に届くようになる。すなわち、
第１端から第２端へ向かう導波光はクラッド部へ漏洩し
た分だけ減衰するが、その逆方向の導波光はほとんど減
衰しないこととなり、方向性を持つ光ファイバとして機
能する。 [0006] In a second aspect, the present invention relates to an optical fiber.
Expand the diameter of one or several parts of the core
Attenuated by diffusing the guided light transmitted through the enlarged diameter part
From the first end of the optical fiber
A directional optical filter provided only at a distance of less than 3 cm.
Offer Iva. Directional optical fiber according to the second aspect
At the first end, the guided light incident from the first end
A Leakage into the cladding at the enlarged diameter part
The leaked light is almost
Will not reach the end. On the other hand, the guided light incident from the second end is
Leakage into the cladding at the core enlarged portion near the first end
However, the distance from the first end to the
Most of the light reaches the first end. That is,
The guided light from the first end to the second end leaks to the cladding.
But the guided light in the opposite direction is almost reduced.
It will not fade, and it will be used as a directional optical fiber.
Works.
【０００７】上記構成において、比較的長時間の高温処
理は、数分間〜数十分間、７００℃〜１８００℃に、光
ファイバの１箇所または数箇所の部分を曝す処理を用い
ることが出来る。高温処理条件（温度，時間など）を加
減することで、コア部を拡径する程度を容易に制御でき
る。従って、減衰量を高精度に調整することが出来る。 [0007] In the above configuration, the high-temperature treatment for a relatively long time is performed.
The temperature is between 700 ° C and 1800 ° C for several minutes to tens of minutes.
Using a process that exposes one or several parts of the fiber
Rukoto can. Add high temperature processing conditions (temperature, time, etc.)
By reducing the diameter, the degree to which the core is expanded can be easily controlled.
You. Therefore, the amount of attenuation can be adjusted with high accuracy.
【０００８】[0008]
【０００９】[0009]
【００１０】[0010]
【００１１】[0011]
【００１２】[0012]
【発明の実施の形態】以下、図に示す実施形態により本
発明をさらに詳細に説明する。なお、これにより本発明
が限定されるものではない。図１は、本発明の一実施形
態にかかる光減衰器入り光ケーブルの製造手順を示すフ
ロー図である。ステップＳ１では、図２の（ａ）に示す
ように、光ファイバの周りに被覆を形成してなる光コー
ド１０の両端にコネクタ５ａ，５ｂを取り付けて、通常
の光ケーブル１００を製作する。ステップＳ２では、図
２の（ｂ）に示すように、光コード１０の１箇所を切断
し、その切断部から収縮前の内側熱収縮チューブ７およ
び外側熱収縮チューブ８を光コード１０ａ，１０ｂに嵌
めておく。ステップＳ３では、図２の（ｂ）に示すよう
に、光コード１０ａ，１０ｂの切断部近傍の被覆を除去
して、光ファイバ１ａ，１ｂを露出させ、図２の（ｃ）
に示すように、光ファイバ１ａ，１ｂの端面を突き合せ
る。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the drawings. Note that the present invention is not limited by this. FIG. 1 is a flowchart showing a procedure for manufacturing an optical cable with an optical attenuator according to an embodiment of the present invention. In step S1, as shown in FIG. 2A, connectors 5a and 5b are attached to both ends of an optical cord 10 having a coating formed around an optical fiber, and a normal optical cable 100 is manufactured. In step S2, as shown in FIG. 2B, one portion of the optical cord 10 is cut, and the inner heat-shrinkable tube 7 and the outer heat-shrinkable tube 8 before shrinking are cut from the cut portion into the optical cords 10a and 10b. Fit it. In step S3, as shown in FIG. 2B, the coating near the cut portions of the optical cords 10a and 10b is removed to expose the optical fibers 1a and 1b.
As shown in (1), the end faces of the optical fibers 1a and 1b are abutted.
【００１３】ステップＳ４では、比較的短時間のアーク
放電処理で光ファイバ１ａ，１ｂのの両端面を接合す
る。アーク放電処理の時間は、例えば３秒間程度であ
る。ステップＳ５では、光ファイバ１ａ，１ｂの端面の
接合部に比較的長時間の高温処理を加えてコア部を拡径
させる。高温処理は、例えばプロパンガスと酸素の混合
ガスの炎に接合部を３０分間くらい曝す。このとき、混
合ガスの混合比，接合部と炎の距離，処理時間などを加
減してコア部の拡径の程度を制御し、所望の減衰量にな
るように調整する。In step S4, both end surfaces of the optical fibers 1a and 1b are joined by a relatively short arc discharge process. The arc discharge time is, for example, about 3 seconds. In step S5, a relatively long time high-temperature treatment is applied to the joints at the end faces of the optical fibers 1a and 1b to expand the diameter of the core. In the high-temperature treatment, for example, the joint is exposed to a flame of a mixed gas of propane gas and oxygen for about 30 minutes. At this time, the degree of diameter expansion of the core portion is controlled by adjusting the mixing ratio of the mixed gas, the distance between the joint and the flame, the processing time, and the like, so that the desired attenuation is adjusted.
【００１４】ステップＳ６では、図２の（ｄ）に示すよ
うに、被覆の除去部分に内側熱収縮チューブ７を被せ、
熱風により収縮させる。７’は、収縮した内側熱収縮チ
ューブである。また、１０’は、コア拡径部分を形成し
た光コードである。ステップＳ７では、図２の（ｅ）に
示すように、内側熱収縮チューブ７’に外側熱収縮チュ
ーブ８を被せ、熱風により収縮させる。８’は、収縮し
た外側熱収縮チューブである。In step S6, as shown in FIG. 2 (d), an inner heat-shrinkable tube 7 is put on the removed portion of the coating.
Shrink by hot air. 7 'is a contracted inner heat-shrinkable tube. Reference numeral 10 'denotes an optical cord having a core diameter enlarged portion. In step S7, as shown in FIG. 2 (e), the inner heat-shrinkable tube 7 'is covered with the outer heat-shrinkable tube 8 and contracted by hot air. 8 'is a contracted outer heat-shrinkable tube.
【００１５】以上により、図３に示すごとき光減衰器入
り光ケーブル１００’を製造することができる。ここ
で、Ｄａはコア拡径部分から第１端までの距離であり、
Ｄｂはコア拡径部分から第２端までの距離である。後述
するように、Ｄａ，Ｄｂ≧３ｃｍのときは無方向性にな
る。As described above, an optical cable 100 'with an optical attenuator as shown in FIG. 3 can be manufactured. Here, Da is the distance from the core enlarged portion to the first end,
Db is the distance from the core enlarged portion to the second end. As described later, non-directionality is obtained when Da and Db ≧ 3 cm.
【００１６】図４は、コア拡径部分の拡大図である。コ
ア拡径部分Ａは、高温処理によりコア部２ａ，２ｂがク
ラッド部３ａ，３ｂ側に広がったものである。コア部２
ｂを透過してきた導波光Ｌｉは、コア拡径部分Ａで一部
がクラッド部３ａに漏れて漏洩光Ｌｒとなり、残りの光
Ｌｏがコア部２ａを通っていく。逆に、コア部２ａを導
波光が透過してきた場合も同様である。FIG. 4 is an enlarged view of the core enlarged diameter portion. In the core enlarged diameter portion A, the core portions 2a and 2b are expanded toward the clad portions 3a and 3b by the high-temperature treatment. Core part 2
A part of the guided light Li that has passed through b leaks into the clad portion 3a at the core enlarged diameter portion A to become leaked light Lr, and the remaining light Lo passes through the core portion 2a. Conversely, the same applies to the case where the guided light is transmitted through the core portion 2a.
【００１７】図５は、コア拡径部分からの漏洩光Ｌｒが
クラッド部３ａを透過する距離に応じて減衰する様子を
表したグラフである。漏洩光Ｌｒは急激に減衰し、距離
Ｄthよりも遠くには実質的に透過しないことが判る。本
発明らの実験によれば、距離Ｄthを３ｃｍとしても事実
上問題ないことが判った。そこで、図３の光減衰器入り
光ケーブル１００’で、図６に示すようにＤａ，Ｄｂ≧
３ｃｍとすれば、コネクタ５ｂからコネクタ５ａへ向か
う導波光もその逆方向の導波光もクラッド部３ａ，３ｂ
へ漏洩した分だけ減衰することとなり、無方向性の光減
衰器として機能する。FIG. 5 is a graph showing a state in which the leakage light Lr from the core enlarged diameter portion is attenuated in accordance with the distance transmitted through the cladding portion 3a. It can be seen that the leakage light Lr attenuates rapidly and does not substantially pass beyond the distance Dth. According to the experiments of the present invention, it has been found that there is practically no problem even if the distance Dth is set to 3 cm. Therefore, in the optical cable 100 'with the optical attenuator shown in FIG. 3, as shown in FIG.
If the distance is 3 cm, the guided light from the connector 5b to the connector 5a and the guided light in the opposite direction are not limited to the clad portions 3a and 3b.
The light is attenuated by the amount leaked, and functions as a non-directional optical attenuator.
【００１８】上記に対して、図７に示すようにＤａ＜３
ｃｍ且つＤｂ≧３ｃｍとすれば、クラッド部３ａへの漏
洩光Ｌｒもコネクタ３ａまで到達するためコネクタ５ｂ
からコネクタ５ａへ向かう導波光はほとんど減衰せず、
一方、コネクタ５ａからコネクタ５ｂへ向かう導波光は
クラッド部３ｂへの漏洩光がコネクタ３ｂまで到達しな
いため減衰し、方向性を持つようになる。実際には、Ｄ
ａを１ｃｍ位にするのが加工性および減衰特性の点で好
ましいため、コア拡径部分Ａはコネクタ５ａに内蔵され
ることになる。図８に、このような方向性光ケーブル２
００’を例示する。５ａ’は、光減衰器入りコネクタ
（コア拡径部分Ａを内蔵したコネクタ）である。On the other hand, as shown in FIG.
cm and Db ≧ 3 cm, the leakage light Lr to the cladding 3a also reaches the connector 3a.
From the connector 5a is hardly attenuated.
On the other hand, the guided light traveling from the connector 5a to the connector 5b is attenuated since the leaked light to the clad portion 3b does not reach the connector 3b, and becomes directional. In fact, D
Since it is preferable that a is about 1 cm in terms of workability and attenuation characteristics, the core enlarged diameter portion A is built in the connector 5a. FIG. 8 shows such a directional optical cable 2.
00 'is exemplified. Reference numeral 5a 'denotes a connector with an optical attenuator (a connector incorporating a core enlarged diameter portion A).
【００１９】図９は、本発明の他の実施形態にかかる光
減衰器入り光ケーブルの外観図である。この光減衰器入
り光ケーブル３００’では、光コード１０’の両端に光
減衰器入りコネクタ５ａ，５ｂを設けており、第１端か
らそれに最も近いコア拡径部分までの距離Ｄａは３ｃｍ
未満であり、第２端からそれに最も近いコア拡径部分ま
での距離Ｄｂは３ｃｍ未満であり、第１端に最も近いコ
ア拡径部分と第２端に最も近いコア拡径部分との距離Ｄ
ｍは３ｃｍ以上である。この光減衰器入り光ケーブル３
００’は、方向性を持たない減衰器として機能する。FIG. 9 is an external view of an optical cable with an optical attenuator according to another embodiment of the present invention. In the optical cable with optical attenuator 300 ′, connectors 5 a and 5 b with optical attenuator are provided at both ends of the optical cord 10 ′, and the distance Da from the first end to the closest core enlarged portion is 3 cm.
And the distance Db from the second end to the closest core enlarged portion is less than 3 cm, and the distance D between the closest core enlarged portion to the first end and the closest core enlarged portion to the second end.
m is 3 cm or more. This optical cable 3 with optical attenuator
00 ′ functions as an attenuator having no directivity.
【００２０】図１０は、本発明の更に他の実施形態にか
かる光減衰器入り光ケーブルの外観図である。この光減
衰器入り光ケーブル４００’は、光コード１０’に複数
のコア拡径部分（外側熱収縮チューブを被せてある部
分）を設けたものである。この光減衰器入り光ケーブル
４００’によれば、大きな減衰量を無理なく得ることが
出来る。すなわち、１つのコア拡径部分で大きな減衰量
を得ようとすると無理が出ることがあるが、それを回避
できる。FIG. 10 is an external view of an optical cable with an optical attenuator according to still another embodiment of the present invention. The optical cable with optical attenuator 400 ′ has an optical cord 10 ′ provided with a plurality of core-diameter enlarged portions (portions covered with an outer heat-shrinkable tube). According to the optical cable with optical attenuator 400 ', a large amount of attenuation can be obtained without difficulty. In other words, trying to obtain a large amount of attenuation at one core enlarged diameter portion may be impossible, but this can be avoided.
【００２１】[0021]
【発明の効果】本発明の光減衰器およびその製造方法、
光減衰器入り光ファイバ、方向性光ファイバ、光減衰器
入り光ケーブルの製造方法、光減衰器入り光ケーブルお
よび方向性光ケーブルによれば、導波光の反射率を十分
に低減できると共に減衰量の精度を高くできる。また、
従来のような段差を生じさせないため、光減衰器とする
ための加工部分をコネクタ内に収容することができる。
さらに、本発明の方向性光ファイバおよび方向性光ケー
ブルによれば、方向性を持たせることが出来る。The optical attenuator of the present invention and the method of manufacturing the same,
According to the optical fiber with optical attenuator, the directional optical fiber, the method of manufacturing the optical cable with optical attenuator, the optical cable with optical attenuator and the directional optical cable, the reflectance of the guided light can be sufficiently reduced and the precision of the attenuation can be reduced. Can be higher. Also,
Since a step is not generated as in the related art, a processed portion for forming an optical attenuator can be accommodated in the connector.
Furthermore, according to the directional optical fiber and the directional optical cable of the present invention, it is possible to provide directivity.
【図１】本発明の一実施形態にかかる光減衰器入り光ケ
ーブルの製造手順を示すフロー図である。FIG. 1 is a flowchart showing a procedure for manufacturing an optical cable with an optical attenuator according to an embodiment of the present invention.
【図２】図１の光減衰器入り光ケーブルの製造手順の各
工程の説明図である。FIG. 2 is an explanatory diagram of each step of a manufacturing procedure of the optical cable with an optical attenuator of FIG. 1;
【図３】本発明の一実施形態にかかる光減衰器入り光ケ
ーブルの外観図である。FIG. 3 is an external view of an optical cable with an optical attenuator according to an embodiment of the present invention.
【図４】コア拡径部分の拡大断面図である。FIG. 4 is an enlarged cross-sectional view of a core enlarged diameter portion.
【図５】コア拡径部分からの漏洩光がクラッド部を透過
する距離に応じて減衰する様子を表したグラフである。FIG. 5 is a graph showing a state in which light leaking from a core enlarged portion is attenuated according to a distance transmitted through a clad portion.
【図６】無方向性となる原理の説明図である。FIG. 6 is an explanatory diagram of a principle of non-directionality.
【図７】方向性を持たせるための原理の説明図である。FIG. 7 is an explanatory diagram of a principle for giving directionality.
【図８】一端のコネクタのみにコア拡径部分を内蔵した
方向性光ケーブルの外観図である。FIG. 8 is an external view of a directional optical cable in which a core enlarged-diameter portion is incorporated only in one connector.
【図９】両端のコネクタにコア拡径部分を内蔵した光減
衰器入り光ケーブルの外観図である。FIG. 9 is an external view of an optical cable with an optical attenuator in which a core enlarged-diameter portion is incorporated in connectors at both ends.
【図１０】光コードの複数箇所にコア拡径部分を設けた
光減衰器入り光ケーブルの外観図である。FIG. 10 is an external view of an optical cable with an optical attenuator provided with a core enlarged portion at a plurality of locations of an optical cord.
【図１１】従来の光減衰器の断面図である。FIG. 11 is a sectional view of a conventional optical attenuator.
１ａ，１ｂ 光ファイ
バ ２ａ，２ｂ コア部 ３ａ，３ｂ クラッド
部 ５ａ，５ｂ，５ａ’，５ｂ’ コネクタ ７ 内側熱収
縮チューブ ８ 外側熱収
縮チューブ １０，１０’ 光コード １００，１００’，３００’，４００’ 光減衰器
入り光ケーブル ２００’ 方向性光
ケーブル Ａ コア拡径
部分1a, 1b Optical fiber 2a, 2b Core part 3a, 3b Cladding part 5a, 5b, 5a ', 5b' Connector 7 Inner heat-shrinkable tube 8 Outer heat-shrinkable tube 10, 10 'Optical code 100, 100', 300 ', 400 'Optical cable with optical attenuator 200' Directional optical cable A Core expanded part
───────────────────────────────────────────────────── フロントページの続き (72)発明者 竹鼻 敏 長野県上田市大字大屋300番地 東京特 殊電線株式会社 上田工場内 (56)参考文献 特開 平５−88022（ＪＰ，Ａ) 特開 平７−63922（ＪＰ，Ａ) 特開 平８−160227（ＪＰ，Ａ) 特開 平４−243201（ＪＰ，Ａ) 特開 平４−84110（ＪＰ，Ａ) 特開 平８−62424（ＪＰ，Ａ) 実開 昭55−159305（ＪＰ，Ｕ) 実開 昭63−96505（ＪＰ，Ｕ) 実開 昭55−92102（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) G02B 6/00 311 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Satoshi Takehana 300 Oya, Ueda-shi, Nagano Tokyo Special Electric Cable Co., Ltd. Ueda Plant (56) References JP-A-5-88022 (JP, A) JP-A Heihei 7-63922 (JP, A) JP-A-8-160227 (JP, A) JP-A-4-243201 (JP, A) JP-A-4-84110 (JP, A) JP-A-8-62424 (JP, A A) Japanese Utility Model Showa 55-159305 (JP, U) Japanese Utility Model Showa 63-96505 (JP, U) Japanese Utility Model Showa 55-92102 (JP, U) (58) Fields surveyed (Int. Cl. 7 , DB name) ) G02B 6/00 311
Claims (2)
径し、そのコア拡径部分を透過する導波光を当該部分で
拡散させて減衰させるようにした光減衰器を、光ファイ
バの第１端および第２端からそれぞれ３ｃｍ未満で略対
称な位置に設けたことを特徴とする光減衰器入り光ファ
イバ。1. An optical attenuator comprising: a core portion having a plurality of portions of an optical fiber whose diameter is expanded; and a waveguide light transmitted through the core expanded portion is diffused and attenuated by the portion. An optical fiber containing an optical attenuator, wherein the optical fiber is provided at a position substantially less than 3 cm from the first end and the second end, respectively.
のコア部を拡径し、そのコア拡径部分を透過する導波光
を当該部分で拡散させて減衰させるようにした光減衰器
を、光ファイバの第１端から３ｃｍ未満のみに設けたこ
とを特徴とする方向性光ファイバ。2. An optical attenuator, wherein a core portion of one or several portions of an optical fiber is expanded, and guided light transmitted through the expanded core portion is diffused and attenuated by the portion. A directional optical fiber provided only at less than 3 cm from the first end of the optical fiber.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24656696A JP3198457B2 (en) | 1996-09-18 | 1996-09-18 | Optical fiber with optical attenuator and directional optical fiber |
| US08/831,274 US5875277A (en) | 1996-09-18 | 1997-03-31 | Optical attenuator and a method of making the same, an optical fiber cable incorporating the optical attenuator and a method of making the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24656696A JP3198457B2 (en) | 1996-09-18 | 1996-09-18 | Optical fiber with optical attenuator and directional optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH1090523A JPH1090523A (en) | 1998-04-10 |
| JP3198457B2 true JP3198457B2 (en) | 2001-08-13 |
Family
ID=17150327
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24656696A Expired - Fee Related JP3198457B2 (en) | 1996-09-18 | 1996-09-18 | Optical fiber with optical attenuator and directional optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3198457B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009014681A (en) * | 2007-07-09 | 2009-01-22 | Panasonic Electric Works Co Ltd | Hot-line detector for optical fiber, and optical termination box |
-
1996
- 1996-09-18 JP JP24656696A patent/JP3198457B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH1090523A (en) | 1998-04-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP0770890B1 (en) | Optical fiber filter | |
| CA1311381C (en) | Connector employing mode field modification | |
| EP0725289B1 (en) | Optical coupler using ferrules with four polarization maintaining optical fibres | |
| US20030081915A1 (en) | Splice joint and process for joining a microstructured optical fiber and a conventional optical fiber | |
| US6244757B1 (en) | Thermally expanded core fiber fabrication method and optical fiber coupling method | |
| US5930421A (en) | Optical fiber and method for coupling optical fibers | |
| JPH08171020A (en) | Optical coupling device | |
| US6614961B2 (en) | Method of fabricating a fused-type mode-selective directional coupler | |
| US6421482B1 (en) | Device for reflecting light | |
| US20010017971A1 (en) | Non-reflection optical fiber termination and method of manufacturing the same | |
| JP2850996B2 (en) | Optical coupling device | |
| JP3198457B2 (en) | Optical fiber with optical attenuator and directional optical fiber | |
| JPH01255803A (en) | Optical fixed attenuator | |
| JPH07174929A (en) | Light branching device and optical parts | |
| US5875277A (en) | Optical attenuator and a method of making the same, an optical fiber cable incorporating the optical attenuator and a method of making the same | |
| JP3208703B2 (en) | Optical connector | |
| JP2619130B2 (en) | Single Mode Optical Fiber Interconnection Method | |
| JP3149671B2 (en) | Method for manufacturing mode-field-diameter enlarged optical waveguide | |
| JP3959871B2 (en) | Optical star coupler | |
| JPH1123884A (en) | Photocoupler | |
| JP3142028B2 (en) | Optical attenuator | |
| JPH06347661A (en) | Optical components | |
| JP2003107256A (en) | Manufacturing method for core diffusion optical fiber | |
| JP2001356248A (en) | Optical module | |
| JPS6370805A (en) | Non-break changeover connector for optical transmission line |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20080615 Year of fee payment: 7 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20090615 Year of fee payment: 8 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100615 Year of fee payment: 9 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110615 Year of fee payment: 10 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120615 Year of fee payment: 11 |
|
| LAPS | Cancellation because of no payment of annual fees |