JPH023A - Method of accessing optical fiber circuit and connector plug thereof - Google Patents

Method of accessing optical fiber circuit and connector plug thereof

Info

Publication number
JPH023A
JPH023A JP62299072A JP29907287A JPH023A JP H023 A JPH023 A JP H023A JP 62299072 A JP62299072 A JP 62299072A JP 29907287 A JP29907287 A JP 29907287A JP H023 A JPH023 A JP H023A
Authority
JP
Japan
Prior art keywords
optical fiber
refractive index
light
light guide
connector plug
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.)
Granted
Application number
JP62299072A
Other languages
Japanese (ja)
Other versions
JP2572402B2 (en
Inventor
Masatoshi Shimizu
正利 清水
Hisashi Murata
久 村田
Hideo Kobayashi
英夫 小林
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.)
Nippon Telegraph and Telephone Corp
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 JP62299072A priority Critical patent/JP2572402B2/en
Publication of JPH023A publication Critical patent/JPH023A/en
Application granted granted Critical
Publication of JP2572402B2 publication Critical patent/JP2572402B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • G02B6/26—Optical coupling means
    • G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
    • G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
    • G02B6/2852—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers using tapping light guides arranged sidewardly, e.g. in a non-parallel relationship with respect to the bus light guides (light extraction or launching through cladding, with or without surface discontinuities, bent structures)
    • 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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4286—Optical modules with optical power monitoring
    • 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
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4287—Optical modules with tapping or launching means through the surface of the waveguide
    • G02B6/4289—Optical modules with tapping or launching means through the surface of the waveguide by inducing bending, microbending or macrobending, to the light guide

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Communication System (AREA)
  • Mechanical Coupling Of Light Guides (AREA)

Abstract

PURPOSE:To efficiently take out signal light to the outside by disposing a waveguide having a prescribed refractive index in tight contact with the clad part of an optical fiber for wave guiding. CONSTITUTION:The waveguide 5 has the refractive index above the refractive index of the clad part of the optical fiber 10 for guiding the in-circuit signal light. This waveguide 5 is disposed in such a manner that the waveguide comes into contact with the clad part by an much as a prescribed length in the same direction as the signal light guiding direction of the optical fiber 20. The waveguide is fixed by a layer 51 of an adhesive agent and a photodetector 30 is provided to the end of the waveguide 5. The radiation mode and clad mode light generated in the optical fiber juncture of this constitution are partly guided through the waveguide 5 to the outside so that the signal light is partly taken out. The conversion efficiency of about -20dB is obtd. according to this method. The excitation of the external signal light of the same level as the level of the in-circuit signal light is possible if a high-output light source is used.

Description

【発明の詳細な説明】 （産業上の利用分野） 本発明は光ファイバ回線の信号光に影響を与えずに、該
光ファイバ回線の信号光の一部を取り出しあるいは逆に
外部信号光を光ファイバ回線内に励起する方法及びその
方法に用いるコネクタプラグに関するものである。Detailed Description of the Invention (Industrial Field of Application) The present invention extracts a part of the signal light of an optical fiber line without affecting the signal light of the optical fiber line, or conversely converts external signal light into an optical fiber. The present invention relates to a method of exciting a fiber line and a connector plug used in the method.

（従来の技術とその問題点） 光ファイバは脆性材料であるため、メタルの場合のよう
な単純な接触によりマルチ接続を用いて通信回線にアク
セスする方法は不可能である。光ファイバ回線へのアク
セス技術はきわめて重要な技術であることから、従来よ
り各種の手法が提起されている。従来技術は次の３つに
大別できる。(Prior Art and its Problems) Since optical fiber is a brittle material, it is impossible to access a communication line using multiple connections through simple contact as in the case of metal. Since the technology for accessing optical fiber lines is an extremely important technology, various methods have been proposed to date. Conventional techniques can be roughly divided into the following three types.

すなわち、 （１）光ファイバの曲げを用いる方法 （２）光結合素子を用いる方法 （３）光ファイバ接続部からの漏洩を用いる方法である
。That is, (1) a method using bending of an optical fiber, (2) a method using an optical coupling element, and (3) a method using leakage from an optical fiber connection part.

方法（１）は光ファイバを曲げることにより導波モード
と放射モード間の結合が生じ、回線内の信号光の一部を
外部に取り出すことが可能となる。In method (1), coupling between the waveguide mode and the radiation mode occurs by bending the optical fiber, making it possible to extract a portion of the signal light within the line to the outside.

しかし、この方法では、光ファイバ保護の面から被覆を
有する心線部分で行う必要があるため、被覆の状態によ
って結合効率が大幅に変化し、安定なアクセスが困難で
ある。特に、単一モード（ＳＭ）光ファイバでは曲げに
より回線内信号光の損失が大きくなり、通信状態に明確
な影響が生じる。さらに、曲げにより光ファイバが破断
する危険性が高い。However, in this method, it is necessary to perform the process on a coated core part in order to protect the optical fiber, so the coupling efficiency varies greatly depending on the state of the coating, making stable access difficult. In particular, in single mode (SM) optical fibers, bending increases the loss of signal light within the line, which clearly affects the communication state. Furthermore, there is a high risk that the optical fiber will break due to bending.

方法（２）は製造コストが極めて高く、光ファイバとの
接続点で信号光の損失が大きくなる。Method (2) is extremely expensive to manufacture and causes a large loss of signal light at the connection point with the optical fiber.

方法（３）は光ファイバ接続部におけるモード変換を利
用するものである。接続点の前後の光ファイバの構造が
僅かに異なること、ファイバ端面間の軸ずれ等により導
波モードと放射モードとの間にモード変換が生じる。こ
れを活用して第２図に示す如く接続点の近傍から光ファ
イバ内の信号光の一部を取り出す方法が実用化されてい
る。Method (3) utilizes mode conversion at the optical fiber connection. Mode conversion occurs between the waveguide mode and the radiation mode due to slight differences in the structure of the optical fibers before and after the connection point, axial misalignment between the fiber end faces, etc. Utilizing this, a method has been put into practical use in which a portion of the signal light within the optical fiber is extracted from the vicinity of the connection point, as shown in FIG.

第２図に示す方法の狙いは光ファイバ１０を接続する準
備段階で両光ファイバ間の軸ずれ、折れ曲がりを最小に
調整することにあった。光ファイバ１０のコア間に軸ず
れ、折れ曲がりがあると接続点に於てモード変換が起こ
り、上部側光ファイバ１０の導波モードの一部が下部側
光ファイバ１０内では放射モードにおける光（以下単に
放射モード光という）となる。この射放モードは裸の光
ファイバ１０の外部が空気のためクラッドモードにおけ
る光（以下単にクラッドモード光という）として伝搬す
るがクラッドより屈折率の高い材料がクラッドに接触す
ると、クラッドの外部に漏洩する。The purpose of the method shown in FIG. 2 is to minimize the axis misalignment and bending between the optical fibers 10 in the preparation stage for connecting the optical fibers 10. If there is an axis misalignment or bending between the cores of the optical fibers 10, mode conversion occurs at the connection point, and a part of the waveguide mode of the upper optical fiber 10 becomes light in the radiation mode (hereinafter referred to as radiation mode) in the lower optical fiber 10. (simply called radiation mode light). Since the outside of the bare optical fiber 10 is air, this radiation mode propagates as light in the cladding mode (hereinafter simply referred to as cladding mode light), but when a material with a higher refractive index than the cladding comes into contact with the cladding, it leaks to the outside of the cladding. do.

第２図（ａ）は光ファイバ心線１の裸の光ファイバ１０
に屈折率の整合用グリス２を付け、受光素子３で漏洩光
を受光する構成を示す。同図（ｂ）は光ファイバ心線１
の被覆１１から漏洩する光をグリス２を経て受光素子３
で受光する構成である。FIG. 2(a) shows the bare optical fiber 10 of the optical fiber core 1.
A configuration is shown in which a refractive index matching grease 2 is applied to and a light receiving element 3 receives leaked light. The same figure (b) shows the optical fiber core 1
The light leaking from the coating 11 passes through the grease 2 to the light receiving element 3.
It is configured to receive light at

この従来例では漏洩光の集光効率が極めて低く、また、
受光素子３の代わりに発光素子を設置しても光ファイバ
１０内への励起効率が極めて低いことになり、入出力の
アクセス方法として適さない本発明の目的は、コネクタ
プラグ内部から漏洩光を効率良く安定的に外部に取り出
す方法、および逆の手順で外部から光ファイバ接続点に
外部信号光を効率良く安定的に励起する方法ならびにそ
れらの方法に使用するコネクタプラグを提供することに
ある。In this conventional example, the collection efficiency of leaked light is extremely low, and
Even if a light emitting element is installed in place of the light receiving element 3, the excitation efficiency into the optical fiber 10 will be extremely low, making it unsuitable as an input/output access method. It is an object of the present invention to provide a method for extracting external signal light to the outside in a good and stable manner, a method for efficiently and stably exciting external signal light from the outside to an optical fiber connection point in the reverse procedure, and a connector plug used in these methods.

（問題点を解決するための手段） 上記目的を達成するため第１の本発明は、光ファイバ回
線内の光ファイバの接続端末部に心出し部材などを装着
して成る一対の光コネクタプラグの接続部において、該
コネクタプラグ内部に設置されている回線内信号光の導
波用光ファイバのクラッド部の屈折率以上の屈折率を有
する導光路を該光ファイバの信号光導波方向と同一方向
に所定長さだけ該クラッド部に密接するように配置し、
該光ファイバ接続部で発生する放射モード光やクラッド
モード光の一部を該導光路を通して光ファイバの外部に
導くことにより、光ファイバ回線の信号光の一部を取り
出すことを特徴とし、第２の本発明は、コネクタプラグ
本体内部に設置されている回線内信号光の導波用光ファ
イバのクラッド部に密接するよう配置し、該導光信号光
の出力側端部はコネクタプラグ本体外に臨む如く設け該
端部に対向して受光素子を設けたことを特徴とし、第３
の本発明は、光ファイバ回線内の光ファイバの接続端末
部に心出し部材などを装着して成る一対の光コネクタプ
ラグの接続部において、該コネクタプラグ内部に設置さ
れている回線内信号光の導波用光ファイバのクラッド部
の屈折率以上の屈折率を有する導光路を該光ファイバの 信号光導波方向と同一方向に所定長さだけ該クラッド部
に密接して配置し、該導光路を通して外部信号光を光フ
ァイバ接続点に入射することにより、該光ファイバ回線
に外部信号を励起することを特徴とし第４の本発明は、
コネクタプラグ本体内部に設置されている回線内信号光
導波用光ファイバのクラッド部の屈折率以上の屈折率を
有する導光路を、該光ファイバの信号光導波方向と同一
方向に所定長さだけ該クラッド部に密接して配置し、該
導光路の信号光の入力側端部はコネクタプラグ本体外に
臨む如く設け、該端部に対向して発光素子を設けたこと
を特徴とする。(Means for Solving the Problems) In order to achieve the above object, a first aspect of the present invention provides a pair of optical connector plugs each having a centering member attached to a connecting terminal portion of an optical fiber in an optical fiber line. At the connection part, a light guide path having a refractive index higher than the refractive index of the cladding part of the optical fiber for guiding the signal light in the line installed inside the connector plug is arranged in the same direction as the signal light waveguide direction of the optical fiber. arranged so as to be in close contact with the cladding part by a predetermined length,
A part of the signal light of the optical fiber line is extracted by guiding a part of the radiation mode light or cladding mode light generated at the optical fiber connection part to the outside of the optical fiber through the light guide path, According to the present invention, the optical fiber is placed in close contact with the cladding part of the optical fiber for guiding the signal light in the line installed inside the connector plug body, and the output side end of the light guiding signal light is placed outside the connector plug body. The third embodiment is characterized in that a light-receiving element is provided facing the end of the light-receiving element.
The present invention is directed to the connection of a pair of optical connector plugs in which a centering member or the like is attached to the connection end of an optical fiber in an optical fiber line. A light guide having a refractive index greater than or equal to the refractive index of the cladding of the waveguide optical fiber is arranged closely to the cladding for a predetermined length in the same direction as the signal light waveguide direction of the optical fiber, and the light guide is passed through the light guide. A fourth aspect of the present invention is characterized in that an external signal is excited in the optical fiber line by inputting the external signal light into the optical fiber connection point.
A light guide path having a refractive index higher than the refractive index of the cladding part of the optical fiber for intra-line signal light waveguide installed inside the connector plug body is installed for a predetermined length in the same direction as the signal light waveguide direction of the optical fiber. It is characterized in that it is arranged in close contact with the cladding part, the input side end of the signal light of the light guide is provided so as to face the outside of the connector plug body, and a light emitting element is provided opposite the end.

（作用） 本発明の作用について以下に説明する。接続点の光ファ
イバ端面への入射光パワーをＰ０、接続点通過後の伝搬
光成分をＰ１、漏洩光成分をＰ２漏洩光成分の受光パワ
ーをＰ３とし、接続点でのパワー伝達係数をａ（ａ＝Ｐ
１／Ｐ０）、漏洩光成分の集光効率をｋ（ｋ＝Ｐ３／Ｐ
２）とすると受光パワー：Ｐ３＝ｋ（１−ａ）Ｐ０とな
る。１０　１０ｇ（ｋ）＝Ｋ（ｄＢ）をパセメータにし
、光ファイバ接続損失：−１０　１０ｇ（ａ）（ｄＢ）
と漏洩光成分の受光パワー／伝搬光パワー１０　１０ｇ
（Ｐ３／Ｐ１）（ｄＢ）の関係を第３図に示す。また第
３図中に光ファイバの導波方向と同一方向に接して配置
してある導光路の光ファイバとの接触長Ｌを１０ｍｍ、
５５ｍｍとした時の測定値を示す。第３図から、Ｌ＝１
０ｍｍの時、集光効率Ｋは−２３ｄｂ、Ｌ＝５５ｍｍの
時、集光効率Ｋは−１１ｄＢとなり、導光路と光ファイ
バとの接触長を長くすることになり、集光効率Ｋ（ｄＢ
）は改善されることが分かる。また、この集光効率Ｋは
導光路の曲げ径に依存し、導光路の曲げ径を大きくする
ことによっても改善できる。第２図に示すような従来例
の構成では、漏洩成分を集光できないため、安定したＳ ／Ｎの良い受光は困難となる。(Function) The function of the present invention will be explained below. The incident light power to the optical fiber end face at the connection point is P0, the propagation light component after passing through the connection point is P1, the leakage light component is P2, the received power of the leakage light component is P3, and the power transfer coefficient at the connection point is a( a=P
1/P0), and the light collection efficiency of the leaked light component is k (k=P3/P
2), the received light power: P3=k(1-a)P0. 10 10g(k)=K(dB) as passemeter, optical fiber connection loss: -10 10g(a)(dB)
and leakage light component light reception power/propagation light power 10 10g
The relationship between (P3/P1) (dB) is shown in FIG. In addition, the contact length L with the optical fiber of the light guide, which is arranged in contact with the same direction as the waveguide direction of the optical fiber in FIG. 3, is 10 mm.
The measured values are shown when the diameter is 55 mm. From Figure 3, L=1
When L = 0 mm, the light collection efficiency K is -23 dB, and when L = 55 mm, the light collection efficiency K is -11 dB, which means that the contact length between the light guide path and the optical fiber is lengthened, and the light collection efficiency K (dB
) can be seen to be improved. Moreover, this light collection efficiency K depends on the bending diameter of the light guide, and can be improved by increasing the bending diameter of the light guide. In the conventional configuration shown in FIG. 2, leakage components cannot be focused, making it difficult to receive light with a stable S/N ratio.

また、集光効率Ｋの改善により、逆プロセスでの外部信
号光を効率良く対向接続される光ファイバ中に励起する
ことができる。すなわち、光源から光ビームを導波路中
に入射すれば入射光の一部は光ファイバからの漏洩光と
全く逆の光路をとるモードに変換される。従来の第２図
の構成で受光素子の代わりに光源を設置しても変換効率
は極めて低く、対向光ファイバ中へ励起される伝搬成分
は通常手段では検知不可能である。しかるに、本方法に
よれば、−２０ｄＢ程度の変換効率を得ることが可能で
あり、高出力光源を用いることによって回線内の信号光
と同レベルの外部信号光を励起することが可能である。Furthermore, by improving the light collection efficiency K, external signal light in the reverse process can be efficiently excited into the optical fibers that are connected oppositely. That is, when a light beam is input from a light source into a waveguide, a portion of the incident light is converted into a mode that takes an optical path completely opposite to that of the light leaking from the optical fiber. Even if a light source is installed in place of the light receiving element in the conventional configuration shown in FIG. 2, the conversion efficiency is extremely low, and the propagation component excited into the opposing optical fiber cannot be detected by normal means. However, according to this method, it is possible to obtain a conversion efficiency of about -20 dB, and by using a high-output light source, it is possible to excite external signal light at the same level as the signal light within the line.

（実施例１） 第１図（Ａ）は光ファイバ内の信号光の一部を外部に取
り出すアクセス方法の実施例を示すものであって、１は
光ファイバ心線、１０は光ファイバ心線１の光ファイバ
、４はコネクタプラグで、その本体は心出しフェルール
４０とアダプタ４１とからなる。５は導光路、２０はガ
イドスリープ、３０は受光素子、５１は接着剤からなる
接着層である。(Embodiment 1) FIG. 1(A) shows an embodiment of an access method for extracting a part of the signal light in an optical fiber to the outside, in which 1 is an optical fiber core, and 10 is an optical fiber core. 1 is an optical fiber, and 4 is a connector plug, the main body of which consists of a centering ferrule 40 and an adapter 41. 5 is a light guide path, 20 is a guide sleeve, 30 is a light receiving element, and 51 is an adhesive layer made of adhesive.

一対のコネクタプラグ４，４はガイドスリープ２０によ
って軸合わせ接続される。光ファイバ１０は心出しフェ
ルール４０によってプラグ先端部において長さｌに亘っ
て高精度に心出しされている。光ファイバ１０は標準型
の単一モード光ファイバ（クラッド径１２５μｍ、モー
ドフィールド径１０μｍ、波長１．３μｍ）であり、当
該コネクタの接続損失は平均０．４ｄＢである。この損
失のほとんどが接続点での僅かな軸ずれによって生じて
いる この軸ずれにより損失光成分は光ファイバ１０内では漏
洩光となる。この漏洩光は拡がり角５度の範囲内に集中
しているので、光ファイバ１０の先端から約０．７ｍｍ
の間は光ファイバ１０のクラッド中にある。プラグ４は
先端から１例えば０．５ｍｍ入ったところから導光路５
を内含している。導波路５は光ファイバ１０のクラッド
部の屈折率ｎ１より僅かに高い屈折率ｎ２を有する導光
材料、例えば合成石英材料に高屈折率ドーパントを添加
した低損失ガラスあるいは、紫外線硬化性樹脂等よりな
る。該導光路５と光ファイバ１０のクラッド間はｎ１＜
ｎａ＜ｎ２の屈折率ｎａを有する接着剤の層５１を介し
て光ファイバ１０の信号光導波方向と同一方向に所定長
さだけ該クラッド部に密接して固定され、該導光路５の
外表面は接着部を除いて低屈折率ｎＲを有する低屈折率
層５２で覆われてフェルール４０に固定されている。The pair of connector plugs 4, 4 are axially aligned and connected by a guide sleeve 20. The optical fiber 10 is centered with high accuracy over a length l at the tip of the plug by a centering ferrule 40. The optical fiber 10 is a standard single mode optical fiber (cladding diameter 125 μm, mode field diameter 10 μm, wavelength 1.3 μm), and the connection loss of the connector is 0.4 dB on average. Most of this loss is caused by a slight axis deviation at the connection point. Due to this axis deviation, the lost light component becomes leakage light within the optical fiber 10. Since this leaked light is concentrated within the range of a spread angle of 5 degrees, it is approximately 0.7 mm from the tip of the optical fiber 10.
The space between the two ends is in the cladding of the optical fiber 10. The plug 4 enters the light guide path 5 from a point 1, for example, 0.5 mm from the tip.
Contains. The waveguide 5 is made of a light guide material having a refractive index n2 slightly higher than the refractive index n1 of the cladding portion of the optical fiber 10, such as a low-loss glass made by adding a high refractive index dopant to a synthetic quartz material, or an ultraviolet curable resin. Become. The distance between the light guide path 5 and the cladding of the optical fiber 10 is n1<
The outer surface of the light guide path 5 is closely fixed to the cladding portion for a predetermined length in the same direction as the signal light waveguide direction of the optical fiber 10 via an adhesive layer 51 having a refractive index na of na<n2. is fixed to the ferrule 40 with the exception of the adhesive portion covered with a low refractive index layer 52 having a low refractive index nR.

又、該導光路５の接着側と反対側すなわち信号光の出力
側の端部は曲げ部を介してアダプタ４１の外面まで導出
されて外部に臨み、該端部に対向して受光素子３０が設
けられている。Further, the end of the light guide path 5 on the side opposite to the adhesive side, that is, on the output side of the signal light, is guided to the outer surface of the adapter 41 through the bent part and faces the outside, and the light receiving element 30 is arranged opposite to the end. It is provided.

第４図（ｂ）は前述したコネクタプラグにおける第４図
（ａ）に示すＸ−Ｘ′断面内の屈折率の関係を図示して
いる。ｎ０は光ファイバ１０のコア、ｎ１は同じくクラ
ッド、ｎａは接着層５１、ｎ２は導光路５、ｎＲは低屈
折率層５２の各屈折率を示している。FIG. 4(b) illustrates the relationship of the refractive index within the section XX' shown in FIG. 4(a) in the aforementioned connector plug. n0 is the core of the optical fiber 10, n1 is the cladding, na is the adhesive layer 51, n2 is the light guide path 5, and nR is the refractive index of the low refractive index layer 52.

なお、低屈折率層５２を、金属コートとすることも可能
である。また、心出しフェルール４０はアルミナセラミ
ック材料、アダプタ４１はプラスチック成形材よりなり
、光を透過しない構成となっている。Note that the low refractive index layer 52 can also be made of a metal coat. Further, the centering ferrule 40 is made of an alumina ceramic material, and the adapter 41 is made of a plastic molded material, so that they do not transmit light.

この様な構成により、光ファイバ１０の先端でクラッド
中を伝搬している漏洩光すなわち放射モード光やクラッ
ドモード光の一部を導光路５の端部に導き、受光素子３
０を介してプラグの外部に取り出すことができる。漏洩
光の典型的な経路を破線で示す。With this configuration, part of the leakage light, that is, radiation mode light and cladding mode light propagating in the cladding at the tip of the optical fiber 10 is guided to the end of the light guide path 5, and the light receiving element 3
0 to the outside of the plug. A typical path of leakage light is shown with a dashed line.

（実施例２） 第１図（Ｂ）は外部信号光を光ファイバ回線内に励起す
るアクセス方法を示すものであり、第１図（Ａ）に示す
構成と異なるのは受光素子３０に代えてＬＤ光源３１を
用いる点である。光源３１は高出力であり、該光源３１
よりの出力光は導光路５を経てその一部は光ファイバ１
０のクラッドモード光に変換される。このクラッドモー
ド光が接続点において対向する光ファイバ１０に入射す
る際に対向する光ファイバ１０間の軸ずれ等により、一
部が他の光ファイバ１０の伝搬モードに変換され、光フ
ァイバ回線に外部信号として励起する。典型的な経路を
図中に破線で示す。(Embodiment 2) FIG. 1(B) shows an access method for exciting external signal light into an optical fiber line, and the difference from the configuration shown in FIG. 1(A) is that the light receiving element 30 is replaced with This is because the LD light source 31 is used. The light source 31 has a high output power, and the light source 31
The output light from
0 cladding mode light. When this cladding mode light enters the opposing optical fibers 10 at the connection point, a portion of the cladding mode light is converted into the propagation mode of another optical fiber 10 due to axis misalignment between the opposing optical fibers 10, and is transferred to the external optical fiber line. Excite as a signal. Typical routes are shown in dashed lines in the figure.

（実施例３） 第５図（ａ）はアクセス用コネクタプラグの他の実施例
を示すものであり、導波路５がプラグ４の接続端面まで
延びている点を除いて前記実施例と同様である。なお、
第５図（ｂ）は第４図（ｂ）と同様の図である。(Embodiment 3) FIG. 5(a) shows another embodiment of the access connector plug, which is similar to the embodiment described above except that the waveguide 5 extends to the connection end surface of the plug 4. be. In addition,
FIG. 5(b) is a diagram similar to FIG. 4(b).

（実施例４） 第６図（ａ）はアクセス用コネクタプラグの他の実施例
を示すものであり、導光路５が光ファイバ１０のクラッ
ド部の外周を包囲して設置されている点を除いて前記第
４図（ａ）に示す実施例と同様である。なお、第６図（
ｂ）は第４図（ｂ）と同様の図である。(Embodiment 4) FIG. 6(a) shows another embodiment of the access connector plug, except that the light guide path 5 is installed to surround the outer periphery of the cladding portion of the optical fiber 10. This is the same as the embodiment shown in FIG. 4(a). In addition, Figure 6 (
b) is a diagram similar to FIG. 4(b).

（実施例５） 第７図（ａ）はアクセス用コネクタプラグの他の実施例
を示すものであり、導光路５が第６図（ａ）と同様に光
ファイバ１０のクラッド部の外周を包囲しかつプラグ４
の接続端面まで延びている点を除いて前記第５図（ａ）
に示す実施例と同様である。なお、第７図（ｂ）は第５
図（ｂ）と同様の図である。(Embodiment 5) FIG. 7(a) shows another embodiment of the access connector plug, in which the light guide path 5 surrounds the outer periphery of the cladding portion of the optical fiber 10 as in FIG. 6(a). And plug 4
5(a) except that it extends to the connecting end surface of
This is similar to the embodiment shown in . In addition, Fig. 7(b) shows the fifth
It is a figure similar to figure (b).

（発明の効果） 以上説明したように、本発明のアクセス方法は操作性の
良いコネクタ接続部を活用するものでアクセス用部品の
構成が簡易であるから光ファイバ回線で容易に回線への
出入りのアクセスが可能になるという利点がある。また
、本発明のアクセス方法は高い光パワーレベルで行うこ
とができ、高速応答素子が適用可能であることから数百
Ｍｂ／ｓの超高速デジタル信号なども回線に全く影響を
与えずに直線的にモニタできる。また、一対のアクセス
ポイント間で、外部信号を用いて既に使用されている回
線に影響を与えずに独立の通信が出来るという利点があ
ることから、光ファイバ回線の保守に際して大きな効果
を発揮する。また、本発明に係るコネクタプラグによれ
ば前述の方法を簡易適確に実施できる。(Effects of the Invention) As explained above, the access method of the present invention utilizes an easy-to-operate connector connection section and the configuration of the access parts is simple, so it is easy to access and exit the line using an optical fiber line. This has the advantage of being accessible. Furthermore, since the access method of the present invention can be performed at a high optical power level and a high-speed response element can be applied, ultra-high-speed digital signals of several hundred Mb/s can be processed linearly without affecting the line at all. can be monitored. Furthermore, since it has the advantage of allowing independent communication between a pair of access points using external signals without affecting the lines already in use, it is highly effective in maintaining optical fiber lines. Moreover, according to the connector plug according to the present invention, the above-described method can be carried out easily and accurately.

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

第１図（Ａ）は光ファイバ回線内の信号光を外部に取り
出す本発明方法の実施例を示す図、第１図（Ｂ）は外部
信号光をファイバ回線内に励起する本発明方法の実施例
を示す図、第２図は光ファイバ接続部からの漏洩を用い
る従来のアクセス方法の概念図、第３図は集光効率をパ
ラメータとしたときの接続損失時と受光パワーの関係を
示す図、第４図は、第１図（Ａ）（Ｂ）に示すアクセス
用コネクタプラグの説明図、第５図，第６図，第７図は
コネクタプラグの他の実施例を示す説明図である。 １：光ファイバ心線、１０：光ファイバ心線１の光ファ
イバ、４：コネクタプラグ、４０：心出しフェルール、
４１：アダプタ、５：導光路、２０：ガイドリープ、３
０：受光素子、３１：発光素子、５１：接着剤からなる
接着層、５２：低屈折率層、FIG. 1(A) is a diagram showing an embodiment of the method of the present invention for extracting signal light in an optical fiber line to the outside, and FIG. 1(B) is a diagram showing an implementation of the method of the present invention for exciting external signal light into the fiber line. A diagram showing an example. Figure 2 is a conceptual diagram of a conventional access method using leakage from an optical fiber connection. Figure 3 is a diagram showing the relationship between splicing loss and received light power when light collection efficiency is used as a parameter. , FIG. 4 is an explanatory diagram of the access connector plug shown in FIGS. 1(A) and (B), and FIGS. 5, 6, and 7 are explanatory diagrams showing other embodiments of the connector plug. . 1: Optical fiber core wire, 10: Optical fiber of optical fiber core wire 1, 4: Connector plug, 40: Centering ferrule,
41: Adapter, 5: Light guide path, 20: Guide leap, 3
0: light receiving element, 31: light emitting element, 51: adhesive layer made of adhesive, 52: low refractive index layer,

Claims (12)

【特許請求の範囲】[Claims] （１）光ファイバ回線内の光ファイバの接続端末部に心
出し部材などを装着して成る一対の光コネクタプラグの
接続部において、該コネクタプラグ内部に設置されてい
る回線内信号光の導波用光ファイバのクラッド部の屈折
率以上の屈折率を有する導光路を、該光ファイバの信号
光導波方向と同一方向に所定長さだけ該クラッド部に密
接するよう配置し、該光ファイバ接続部で発生する放射
モード光やクラッドモード光の一部を該導光路を通して
光ファイバの外部に導くことにより、光ファイバ回線の
信号光の一部を取り出すことを特徴とする光ファイバ回
線のアクセス方法。(1) At the connection part of a pair of optical connector plugs, which are formed by attaching a centering member to the connection terminal part of the optical fiber in an optical fiber line, the waveguide of the signal light in the line installed inside the connector plug. A light guide having a refractive index greater than or equal to the refractive index of the cladding portion of the optical fiber for use is arranged so as to be in close contact with the cladding portion for a predetermined length in the same direction as the signal light waveguide direction of the optical fiber, and the optical fiber connecting portion 1. A method for accessing an optical fiber line, characterized in that a part of the signal light of the optical fiber line is taken out by guiding part of the radiation mode light or cladding mode light generated in the optical fiber to the outside of the optical fiber through the light guide path. （２）コネクタプラグ本体内部に設置されている回線内
信号光の導波用光ファイバのクラッド部の屈折率以上の
屈折率を有する導光路を、該光ファイバの信号光導波方
向と同一方向に所定長さだけ該クラッド部に密接するよ
う配置し、該導光路の信号光の出力側の端部はコネクタ
プラグ本体外に臨む如く設け、該端部に対向して受光素
子を設けたことを特徴とするコネクタプラグ。(2) A light guide path having a refractive index greater than or equal to the refractive index of the cladding of the optical fiber for guiding signal light in the line installed inside the connector plug main body is aligned in the same direction as the signal light waveguide direction of the optical fiber. The light guide is arranged so as to be in close contact with the cladding part by a predetermined length, the end of the signal light output side of the light guide is provided so as to face outside the connector plug body, and the light receiving element is provided opposite to the end. Characteristic connector plug. （３）前記導光路は、前記クラッド部の屈折率よりも高
くかつ該導光路の屈折率よりも低い屈折率の接着剤によ
り該クラッド部に接着され配置されていることを特徴と
する特許請求の範囲第２項記載のコネクタプラグ。(3) A patent claim characterized in that the light guide path is bonded to the cladding part with an adhesive having a refractive index higher than the refractive index of the cladding part and lower than the refractive index of the light guide path. The connector plug described in item 2 of the range. （４）前記導光路は、前記コネクタプラグ本体内部に設
置されている光ファイバのクラッド部外周を包囲して設
置されていることを特徴とする特許請求の範囲第２項記
載のコネクタプラグ。(4) The connector plug according to claim 2, wherein the light guide path is installed so as to surround the outer periphery of a cladding portion of an optical fiber installed inside the connector plug main body. （５）前記導光路の接着部以外の外周を低屈折率層で覆
ったことを特徴とする特許請求の範囲第３項記載のコネ
クタプラグ。(5) The connector plug according to claim 3, wherein the outer periphery of the light guide path other than the adhesive portion is covered with a low refractive index layer. （６）前記導光路の外周を低屈折率層で覆ったことを特
徴とする特許請求の範囲第４項記載のコネクタプラグ。(6) The connector plug according to claim 4, wherein the outer periphery of the light guide path is covered with a low refractive index layer. （７）光ファイバ回線内の光ファイバの接続端末部に心
出し部材などを装着して成る一対の光コネクタプラグの
接続部において、該コネクタプラグ内部に設置されてい
る回線内信号光の導波用光ファイバのクラッド部の屈折
率以上の屈折率を有する導光路を、該光ファイバの信号
光導波方向と同一方向に所定長さだけ該クラッド部に密
接するよう配置し、該導光路を通して外部信号光を光フ
ァイバ接続点に入射することにより該光ファイバ回線に
外部信号を励起することを特徴とする光ファイバ回線の
アクセス方法。(7) At the connecting portion of a pair of optical connector plugs, which are formed by attaching a centering member or the like to the connecting end portion of the optical fiber in an optical fiber line, the waveguide of the signal light within the line installed inside the connector plug. A light guide having a refractive index greater than or equal to the refractive index of the cladding of the optical fiber is arranged so as to be in close contact with the cladding for a predetermined length in the same direction as the signal light waveguide direction of the optical fiber. 1. A method for accessing an optical fiber line, characterized in that an external signal is excited in the optical fiber line by inputting a signal light into an optical fiber connection point. （８）コネクタプラグ本体内部に設置されている回線内
信号光導波用光ファイバのクラッド部の屈折率以上の屈
折率を有する導光路を、該光ファイバの信号光導波方向
と同一方向に所定長さだけ該クラッド部に密接するよう
配置し該導光路の信号光の入力側端部をコネクタプラグ
本体外に臨む如く設け、該端部に対向して発光素子を設
けたことを特徴とするコネクタプラグ。(8) A light guide path having a refractive index greater than or equal to the refractive index of the cladding portion of the optical fiber for intra-line signal light waveguide installed inside the connector plug main body has a predetermined length in the same direction as the signal light waveguide direction of the optical fiber. A connector characterized in that the light guide is arranged so as to be in close contact with the cladding part, the input side end of the signal light of the light guide is provided so as to face outside the connector plug body, and a light emitting element is provided opposite to the end. plug. （９）前記導光路は、前記クラッド部の屈折率よりも高
くかつ該導光路の屈折率よりも低い屈折率の接着剤によ
り該クラッド部に接着され配置されていることを特徴と
する特許請求の範囲第８項記載のコネクタプラグ。(9) A patent claim characterized in that the light guide path is bonded to the cladding part with an adhesive having a refractive index higher than the refractive index of the cladding part and lower than the refractive index of the light guide path. The connector plug described in item 8. （１０）前記導光路は、前記コネクタプラグ本体内部に
設置されている光ファイバのクラッド部外周を包囲して
設置されていることを特徴とする特許請求の範囲第８項
記載のコネクタプラグ。(10) The connector plug according to claim 8, wherein the light guide path is installed so as to surround the outer periphery of a cladding portion of an optical fiber installed inside the connector plug main body. （１１）前記導光路の接着部以外の外周を低屈折率層で
覆ったことを特徴とする特許請求の範囲第９項記載のコ
ネクタプラグ。(11) The connector plug according to claim 9, wherein the outer periphery of the light guide path other than the adhesive portion is covered with a low refractive index layer. （１２）前記導光路の外周を低屈折率層で覆ったことを
特徴とする特許請求の範囲第１０項記載のコネクタプラ
グ。(12) The connector plug according to claim 10, wherein the outer periphery of the light guide path is covered with a low refractive index layer.
JP62299072A 1987-10-23 1987-11-27 Access method for optical fiber line and connector plug thereof Expired - Lifetime JP2572402B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP62299072A JP2572402B2 (en) 1987-10-23 1987-11-27 Access method for optical fiber line and connector plug thereof

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP62-267863 1987-10-23
JP26786387 1987-10-23
JP62299072A JP2572402B2 (en) 1987-10-23 1987-11-27 Access method for optical fiber line and connector plug thereof

Publications (2)

Publication Number Publication Date
JPH023A true JPH023A (en) 1990-01-05
JP2572402B2 JP2572402B2 (en) 1997-01-16

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