JPH0480704A - Optical fiber teminator - Google Patents

Optical fiber teminator

Info

Publication number
JPH0480704A
JPH0480704A JP2193812A JP19381290A JPH0480704A JP H0480704 A JPH0480704 A JP H0480704A JP 2193812 A JP2193812 A JP 2193812A JP 19381290 A JP19381290 A JP 19381290A JP H0480704 A JPH0480704 A JP H0480704A
Authority
JP
Japan
Prior art keywords
optical fiber
light
fiber piece
hood
piece
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
JP2193812A
Other languages
Japanese (ja)
Inventor
Yoji Fujii
藤井　洋二
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.)
NTT Inc
Original Assignee
Nippon Telegraph and Telephone Corp
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 Nippon Telegraph and Telephone Corp filed Critical Nippon Telegraph and Telephone Corp
Priority to JP2193812A priority Critical patent/JPH0480704A/en
Publication of JPH0480704A publication Critical patent/JPH0480704A/en
Pending legal-status Critical Current

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
    • G02B6/24—Coupling light guides
    • G02B6/241—Light guide terminations
    • G02B6/243—Light guide terminations as light absorbers
    • 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
    • G02B6/24—Coupling light guides
    • G02B6/36—Mechanical coupling means
    • G02B6/38—Mechanical coupling means having fibre to fibre mating means
    • G02B6/3807—Dismountable connectors, i.e. comprising plugs
    • G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
    • G02B6/3847—Details of mounting fibres in ferrules; Assembly methods; Manufacture with means preventing fibre end damage, e.g. recessed fibre surfaces
    • G02B6/3849—Details of mounting fibres in ferrules; Assembly methods; Manufacture with means preventing fibre end damage, e.g. recessed fibre surfaces using mechanical protective elements, e.g. caps, hoods, sealing membranes

Landscapes

  • Mechanical Coupling Of Light Guides (AREA)
  • Light Guides In General And Applications Therefor (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)

Abstract

PURPOSE:To realize high return loss and good operability by covering the other end side of a small optical fiber piece and a transparent pipe with a hood whose internal surface is coated with a light absorber. CONSTITUTION:Light guided in an optical fiber connected to the optical fiber terminator through a connector is inputted to one end of the small optical fiber piece 1 and guided out of the other end side. The light which is guided out is made incident on the light absorber 8 coating the internal surface of the hood and absorbed. When the internal surface of the hood is finely roughened and then coated with the light absorber 8, the possibility that intense reflected light is generated in a specific direction is reduced and the absorption area increases. Further, a porous layer is formed of the light absorber 8 and then the absorption area increases more. Consequently, a stable function is displayed regardless of the state of an external field and the operability is good.

Description

【発明の詳細な説明】 〈産業上の利用分舒〉 本発明は、小形、高リターンロスで操作性のよい光ファ
イバ終端器に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application> The present invention relates to an optical fiber terminator that is small in size, has high return loss, and has good operability.

〈従来の技術及び発明が解決しようとする課題〉従来、
光ファイバの終端を高リターンロスとする方法として、
光ファイバ端部に光ファイバコアと屈折率が等しい液体
を付着する方法がある。<Problems to be solved by conventional technology and invention> Conventionally,
As a method to achieve high return loss at the end of an optical fiber,
There is a method of attaching a liquid having the same refractive index as the optical fiber core to the end of the optical fiber.

しかしながら、本方法では屈折率整合液と空気との界面
で反射があり、この反射光が光ファイバに結合しないよ
うに十分に注意する必要があった。However, in this method, reflection occurs at the interface between the refractive index matching liquid and air, and sufficient care must be taken to prevent this reflected light from being coupled to the optical fiber.

また、空気に対する無反射コーティングを端面に施した
光ファイバ小片を被終端光ファイバに融着あるいはコネ
クタで接続する高リターンロス終端方法、又は被終端光
ファイバ端面を斜めカットして反射光が導波光にならな
いようにする高リターンロス終端方法も考えられる。In addition, there are high return loss termination methods in which a small piece of optical fiber with a non-reflective coating on the end face is fused or connected to the optical fiber to be terminated using a connector, or the end face of the optical fiber to be terminated is cut diagonally so that the reflected light becomes guided light. A high return loss termination method can also be considered to prevent this from occurring.

しかし、これらの場合も、光ファイバから取り出された
光が周辺の何らかの反射体で反射され光ファイバに再結
合する虞れがあり、終端部周辺の状態に十分な注意を払
う必要がある。However, in these cases as well, there is a risk that the light extracted from the optical fiber will be reflected by some nearby reflector and recombined into the optical fiber, so it is necessary to pay sufficient attention to the state around the terminal end.

本発明はこのような事情に鑑み、小形、高リターンロス
で操作性のよい光ファイバ終端―を提供することを目的
とする。In view of these circumstances, it is an object of the present invention to provide an optical fiber termination that is small in size, has high return loss, and has good operability.

〈課題を解決するための手段〉 前記目的を達成する本発明の係る光ファイア終端器は、
光コネクタで成端されている光ファイバ用の疑似負荷で
ある光ファイバ終端器において、光ファイバ小片の一端
が光コネクタプラグで成端されていると共に該光ファイ
バ小片の他端には透明体パイプが挿入・固定されており
、この光ファイバ小片の上記他端側は該光ファイバ小片
の上記一端から入力された光が反射しないで該光ファイ
バ小片の外部に取抄出されるか又は反射しても該光ファ
イバ小片の導波光とならずに該光ファイバ小片の外部に
取り出される構造となっており、該光ファイバ小片の上
記他端側及び上記透明体パイプは、内面に光吸収体がコ
ーティングされているフードで被われているとを特徴と
する。<Means for Solving the Problems> The optical fire terminator according to the present invention that achieves the above object has the following features:
In an optical fiber terminator, which is a pseudo load for an optical fiber terminated with an optical connector, one end of a small optical fiber piece is terminated with an optical connector plug, and the other end of the small optical fiber piece is equipped with a transparent pipe. is inserted and fixed, and at the other end of the optical fiber piece, the light input from the one end of the optical fiber piece is extracted to the outside of the optical fiber piece without being reflected, or is reflected. The other end of the optical fiber piece and the transparent pipe are coated with a light absorber on the inner surface. It is characterized by being covered with a hood.

く作 用〉 前記構成の光ファイバ終端器では、該光フアイバ終端式
にコネクタ接続された被終端光ファイバを導波する光は
光ファイバ小片の一端から入力した後他端側から外部へ
取り出される。そして、外部に取り出された光はフード
の内面にコーティングされた光吸収体に入射し、吸収さ
れる。Effect> In the optical fiber terminator having the above configuration, the light guided through the optical fiber to be terminated which is connected to the connector in the optical fiber termination type is inputted from one end of the optical fiber piece and then taken out from the other end side. The light extracted to the outside enters the light absorber coated on the inner surface of the hood and is absorbed.

ここで、フードの内面に微細な凹凸を形成した上に光吸
収体をコーティングすると、特定方向に強い反射光が生
じる可能性が少なくなり、且つ吸収面積が増大する。Here, if fine irregularities are formed on the inner surface of the hood and a light absorber is coated, the possibility that strong reflected light will occur in a specific direction will be reduced and the absorption area will be increased.

さらに、光吸収体のコーティング層を多孔質状にすると
、より一層吸収面積が拡大される。Furthermore, when the coating layer of the light absorber is made porous, the absorption area is further expanded.

〈実 施　例〉 以下、本発明を実施例に基づいて説明する。<fruit Example Hereinafter, the present invention will be explained based on examples.

第１図には一実施例に係る光ファイバ終端器の概略を示
す。同図に示すように、光ファイバ小片１の一端側はフ
ェルール２の微小径孔に他端側は透明体パイプ３の微小
径孔にそれぞれ挿入・固定されている。光ファイバ小片
１のフェルール２側の端面ば平面あるいは球面に研磨さ
れており、一方、透明体パイプ３側の端面ば該光ファイ
バ小片１の軸に垂直な面から所定の角度類いた平面に研
磨されている。そして、フェルール２の外周には嵌合補
助環４及び締結ナツト５が嵌合されて光コネクタプラグ
６が形成されている。一方、光ファイバ小片１の透明体
パイプ３側及び透明体パイプ３はフード７により被われ
ており、フード７の内面には光吸収体として光吸収剤層
８がコーティングされている。FIG. 1 schematically shows an optical fiber terminator according to one embodiment. As shown in the figure, one end of the optical fiber piece 1 is inserted and fixed into a small diameter hole of a ferrule 2, and the other end is inserted and fixed into a small diameter hole of a transparent pipe 3, respectively. The end face of the optical fiber piece 1 on the ferrule 2 side is polished to a flat or spherical surface, while the end face on the transparent pipe 3 side is polished to a plane at a predetermined angle from a plane perpendicular to the axis of the optical fiber piece 1. has been done. An auxiliary fitting ring 4 and a fastening nut 5 are fitted to the outer periphery of the ferrule 2 to form an optical connector plug 6. On the other hand, the transparent pipe 3 side of the optical fiber piece 1 and the transparent pipe 3 are covered by a hood 7, and the inner surface of the hood 7 is coated with a light absorbent layer 8 as a light absorber.

被終端光ファイバを本実施例の光ファイバ終端器で終端
した場合、フェルール２側の端面から光ファイバ小片１
に入力された光は透明体パイプ３側の端面に到達し、一
部は透過して光ファイバ小片１から取り出され、残りは
端面で反射されろ。しかしながら、この端面ば光ファイ
バ小片１の軸に垂直な面から所定の角度類いた平面であ
るので、反射光は光ファイバ小片１の導波光とはならず
、透明体パイプ３の外周面で反射を繰り返しながら光フ
ァイバ小片１から取り出される。したがって、被終端光
ファイバから光ファイバ小片１に入力された光はすべて
光ファイバ小片１から取や出される。そして、このよう
に光ファイバ小片１から取り出された光はフード７の内
面にコーティングされである光吸収剤層８に入射し、吸
収される。この結果、光ファイバ小片１から取り出され
た光は光ファイバ小片１に再び結合して導波光となるこ
とはな（、高リターンロスが達成される。また、光ファ
イバ小片１の光が取り出される側はフード７で被われ、
外界から遮断されているので、リターンロスは外界の影
響を全（受けない。When the optical fiber to be terminated is terminated with the optical fiber terminator of this embodiment, the optical fiber piece 1 is removed from the end face on the ferrule 2 side.
The input light reaches the end face on the transparent pipe 3 side, part of it is transmitted and taken out from the optical fiber piece 1, and the rest is reflected at the end face. However, since this end face is a plane at a predetermined angle from the plane perpendicular to the axis of the optical fiber piece 1, the reflected light does not become guided light in the optical fiber piece 1, but is reflected on the outer peripheral surface of the transparent pipe 3. The optical fiber is taken out from the optical fiber piece 1 by repeating the above steps. Therefore, all the light input to the optical fiber piece 1 from the optical fiber to be terminated is taken out from the optical fiber piece 1. The light extracted from the optical fiber piece 1 in this manner enters the light absorbent layer 8 coated on the inner surface of the hood 7 and is absorbed. As a result, the light extracted from the optical fiber piece 1 is not coupled back to the optical fiber piece 1 and becomes guided light (high return loss is achieved. Also, the light from the optical fiber piece 1 is not extracted from the optical fiber piece 1). The sides are covered with a hood 7,
Since it is cut off from the outside world, return loss is completely unaffected by the outside world.

このように本実施例の光ファイバ終端器では、光ファイ
バ小片１から取り出した光を光吸収剤層８で吸収するの
であるから、光吸収剤層８は低反射率であり、特定方向
に強い反射を示さず、吸収面積の広い構造であることが
望ましい。このような構造はフード７の内面に微細な凹
凸を形成して、この形状に沿って光吸収層８をコーティ
ングするようにすればよい。さらに、光吸収剤層８を多
孔質状にすれば、より一層、吸収面積の拡大に有効であ
る。In this way, in the optical fiber terminator of this embodiment, the light extracted from the optical fiber piece 1 is absorbed by the light absorber layer 8, so the light absorber layer 8 has a low reflectance and is strong in a specific direction. It is desirable that the structure exhibits no reflection and has a large absorption area. Such a structure can be achieved by forming fine irregularities on the inner surface of the hood 7 and coating the light absorption layer 8 along these shapes. Furthermore, if the light absorbent layer 8 is made porous, it is even more effective to expand the absorption area.

また、上記実施例では透明体パイプ３側の光ファイバ小
片１の端面が軸に垂直な面から傾けである構造となって
いるが、かかる端面側の構造は光ファイバ小片１のフェ
ルール２側の端面から入力された光が反射しないで外部
に取り出されるか又は反射しても該光ファイバ小片１の
導波光とならずに外部に取り出される構造であればよく
、例えば光ファイバ小片１の透明体パイプ３側の端面に
無反射コーティングを施した構造としてもよい。なお、
このように光ファイバ小片１の端面に無反射コーティン
グを施す場合には、該端面が軸に対して垂直であっても
何ら支障がないことは明らかである。Further, in the above embodiment, the end face of the optical fiber piece 1 on the side of the transparent pipe 3 is inclined from a plane perpendicular to the axis, but the structure on the end face side is such that the end face of the optical fiber piece 1 on the ferrule 2 side Any structure is sufficient as long as the light input from the end face is taken out to the outside without being reflected, or even if it is reflected, it is taken out to the outside without being guided by the optical fiber piece 1. For example, a transparent body of the optical fiber piece 1 may be used. It is also possible to have a structure in which a non-reflective coating is applied to the end face on the pipe 3 side. In addition,
It is clear that when an anti-reflection coating is applied to the end face of the optical fiber piece 1 in this way, there is no problem even if the end face is perpendicular to the axis.

思上説明した光ファイバ終端器は、従来のマイクロ液領
域などで用いられている同軸用あるいは導波管用の終端
器（ダミーロード）に相当し、小形、高リターンロスで
安定性、操作性の良好なものである。The optical fiber terminator that I just explained corresponds to the coaxial or waveguide terminator (dummy load) used in the conventional micro liquid field, and it is small, has high return loss, and has excellent stability and operability. It is in good condition.

〈発明の効果〉 以上説明したように、本発明に係る光ファイバ終１１１
ｉでは、光ファイバ小片から取り出された光をフード内
面にコーティングされた光吸収剤により吸収するように
しているので、この光が光ファイバ小片に再び結合して
導波光となることがなく、高リターンロスが実現できる
。また、光が取り出される側の光ファイバ小片の端部及
び光吸収剤はフードによって外界と遮断されているので
、外界の状態にかかわらず安定した機能が発揮され、操
作性がよいという効果も奏する。<Effects of the Invention> As explained above, the optical fiber termination 111 according to the present invention
In the i, the light extracted from the optical fiber piece is absorbed by the light absorbing agent coated on the inner surface of the hood, so this light does not recombine with the optical fiber piece and become guided light, resulting in high Return loss can be realized. In addition, since the end of the optical fiber strip and the light absorber on the side from which light is extracted are shielded from the outside world by the hood, stable functionality is achieved regardless of the state of the outside world, resulting in good operability. .

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

第１図は一実施例に係る光ファイバ終端器の概略構造を
示す断面図である。 図面中、 ｌは光ファイバ小片、 ２はフェルール、 ３は透明体パイプ、 ４は嵌合補助環、 ５は締結ナツト、 ６は光コネクタプラグ、 ７はフード、 ８は光吸収剤層である。FIG. 1 is a sectional view showing a schematic structure of an optical fiber terminator according to an embodiment. In the drawings, l is an optical fiber piece, 2 is a ferrule, 3 is a transparent pipe, 4 is a fitting auxiliary ring, 5 is a fastening nut, 6 is an optical connector plug, 7 is a hood, and 8 is a light absorbent layer.

Claims (3)

【特許請求の範囲】[Claims] （１）光コネクタで成端されている光ファイバ用の疑似
負荷である光ファイバ終端器において、光ファイバ小片
の一端が光コネクタプラグで成端されていると共に該光
ファイバ小片の他端には透明体パイプが挿入・固定され
ており、 この光ファイバ小片の上記他端側は該光ファイバ小片の
上記一端から入力された光が反射しないで該光ファイバ
小片の外部に取り出されるか又は反射しても該光ファイ
バ小片の導波光とならずに該光ファイバ小片の外部に取
り出される構造となっており、 該光ファイバ小片の上記他端側及び上記透明体パイプは
、内面に光吸収体がコーティングされているフードで被
われている、 ことを特徴とする光ファイバ終端器。(1) In an optical fiber terminator, which is a pseudo load for an optical fiber terminated with an optical connector, one end of a small optical fiber piece is terminated with an optical connector plug, and the other end of the small optical fiber piece is terminated with an optical connector plug. A transparent pipe is inserted and fixed, and at the other end of the optical fiber piece, the light input from the one end of the optical fiber piece is taken out to the outside of the optical fiber piece without being reflected, or is reflected. Even if the light is not guided by the optical fiber piece, it is taken out to the outside of the optical fiber piece, and the other end side of the optical fiber piece and the transparent pipe have a light absorber on the inner surface. An optical fiber terminator characterized by being covered with a coated hood. （２）請求項１の光ファイバ終端器において、フードの
内面には微細な凹凸が形成されており、光吸収体はこの
内面形状を保ってコーティングされていることを特徴と
する光ファイバ終端器。(2) The optical fiber terminator according to claim 1, wherein the inner surface of the hood is formed with fine irregularities, and the light absorber is coated to maintain this inner surface shape. . （３）請求項１又は２の光ファイバ終端器において、光
吸収体が多孔質状であることを特徴とする光ファイバ終
端器。(3) The optical fiber terminator according to claim 1 or 2, wherein the light absorber is porous.
JP2193812A 1990-07-24 1990-07-24 Optical fiber teminator Pending JPH0480704A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2193812A JPH0480704A (en) 1990-07-24 1990-07-24 Optical fiber teminator

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2193812A JPH0480704A (en) 1990-07-24 1990-07-24 Optical fiber teminator

Publications (1)

Publication Number Publication Date
JPH0480704A true JPH0480704A (en) 1992-03-13

Family

ID=16314175

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2193812A Pending JPH0480704A (en) 1990-07-24 1990-07-24 Optical fiber teminator

Country Status (1)

Country Link
JP (1) JPH0480704A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01112849U (en) * 1988-01-22 1989-07-28

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01112849U (en) * 1988-01-22 1989-07-28

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