JP5237866B2 - Communication light detector - Google Patents

Communication light detector Download PDF

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Publication number
JP5237866B2
JP5237866B2 JP2009080104A JP2009080104A JP5237866B2 JP 5237866 B2 JP5237866 B2 JP 5237866B2 JP 2009080104 A JP2009080104 A JP 2009080104A JP 2009080104 A JP2009080104 A JP 2009080104A JP 5237866 B2 JP5237866 B2 JP 5237866B2
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light
failure detection
communication
optical fiber
receiving member
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JP2010231082A (en
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正嗣 小島
香菜子 鈴木
佳広 中谷
貴雄 西川
弘二郎 伊東
鉄也 末岡
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Hitachi Cable Ltd
NTT Communications Corp
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Hitachi Cable Ltd
NTT Communications Corp
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Priority to JP2009080104A priority Critical patent/JP5237866B2/en
Priority to US12/465,735 priority patent/US8213791B2/en
Priority to CN200910137188.3A priority patent/CN101598838B/en
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    • 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
    • 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
    • G02B6/381—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres
    • G02B6/3825—Dismountable connectors, i.e. comprising plugs of the ferrule type, e.g. fibre ends embedded in ferrules, connecting a pair of fibres with an intermediate part, e.g. adapter, receptacle, linking two plugs
    • 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
    • G02B6/4274—Electrical aspects
    • G02B6/428—Electrical aspects containing printed circuit boards [PCB]
    • 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
    • G02B6/36—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
    • G02B6/3845—Details of mounting fibres in ferrules; Assembly methods; Manufacture ferrules comprising functional elements, e.g. filters

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

Description

本発明は、光伝送路同士を接続する部分に設けられる通信光検知器に係り、特に、通信光検知器自体の故障を検知できる通信光検知器に関する。   The present invention relates to a communication light detector provided at a portion connecting optical transmission lines, and more particularly to a communication light detector capable of detecting a failure of the communication light detector itself.

データセンタや局舎などの光通信関連設備では、光伝送路により伝送される通信光が不可視光である場合、目視にて通信光の存在を確認することができない。そのため、光伝送路によって通信光が伝送されている状態かを保守担当者、運用担当者などの作業者が容易に把握することができず、通信光が伝送されている光伝送路を通信光が伝送されていない状態であると誤認して、光コネクタを抜いてしまう誤操作が起こり得る。   In an optical communication-related facility such as a data center or a station building, when the communication light transmitted through the optical transmission path is invisible light, the presence of the communication light cannot be visually confirmed. For this reason, operators such as maintenance personnel and operation personnel cannot easily grasp whether the communication light is being transmitted through the optical transmission path, and the optical transmission path through which the communication light is transmitted can be communicated with the communication light. May be erroneously detected as being in a state where the optical connector is not transmitted and the optical connector is disconnected.

このような誤操作を防いで光通信関連設備の保守性向上、運用性向上を図るため、光ファイバにおいて光コネクタが接続された状態で不可視光である通信光の有無が目視で確認できるようにした通信光検知器が創案されている。   In order to prevent such erroneous operations and improve the maintainability and operability of optical communication related equipment, it is now possible to visually confirm the presence of invisible communication light with the optical connector connected in the optical fiber. A communication light detector has been devised.

例えば、光ファイバが内蔵された割りスリーブ内で突き合わされるフェルール同士の端面間に隙間を形成し、その隙間に光透過性樹脂からなる導波体を設け、その導波体によって通信光の一部を蛍光体に導き、この蛍光体で可視光を発生させることで、通信光の有無が目視で確認できる通信光検知器が提案されている（例えば、特許文献１参照）。   For example, a gap is formed between the end faces of ferrules that face each other in a split sleeve containing an optical fiber, and a waveguide made of a light-transmitting resin is provided in the gap. A communication light detector has been proposed in which the presence or absence of communication light can be visually confirmed by guiding a portion to a phosphor and generating visible light with the phosphor (see, for example, Patent Document 1).

また、ハウジング内に設けられた光導波路基板などの光分岐手段によって、通信光の一部を分岐して取り出すようにし、取り出した通信光の一部を可視光に変換することにより、光伝送路によって伝送される通信光が伝送されている状態かどうか確認することができる通信光検知器が提案されている（例えば、特許文献２、３参照）。   In addition, a part of communication light is branched and extracted by an optical branching means such as an optical waveguide substrate provided in the housing, and a part of the extracted communication light is converted into visible light, thereby providing an optical transmission line. There has been proposed a communication light detector that can confirm whether or not the communication light transmitted by is transmitted (see, for example, Patent Documents 2 and 3).

特開２００４−１７０４８８号公報JP 2004-170488 A 特開２００４−１３３０７１号公報JP 2004-133071 A 特開２００３−２１８８１３号公報JP 2003-218813 A 特開２００２−２１４４８７号公報JP 2002-214487 A

しかし、通信光検知器自体が故障していると、通信光検知器は、光伝送路によって伝送される通信光を検知することができない。このため、作業者が光伝送路によって通信光が伝送されている状態であるにも拘わらず、光伝送路によって通信光が伝送されていない状態であると誤認して、光コネクタを抜いてしまう可能性がある。   However, if the communication light detector itself fails, the communication light detector cannot detect the communication light transmitted through the optical transmission path. For this reason, the operator mistakenly recognizes that the communication light is not transmitted through the optical transmission path even though the communication light is transmitted through the optical transmission path, and pulls out the optical connector. there is a possibility.

そこで、本発明の目的は、上記課題を解決し、通信光検知器自体の故障を検知できる通信光検知器を提供することにある。   Therefore, an object of the present invention is to provide a communication light detector that can solve the above-described problems and can detect a failure of the communication light detector itself.

本発明は、上記目的を達成するために、光伝送路同士を接続する部分に設けられて前記光伝送路によって伝送される通信光の一部を取り出すための光取出し手段と、前記光取出し手段によって取り出された前記通信光の一部を検知するための光検知部と、を有する通信光検知器において、前記光検知部に、前記光取出し手段側へ故障検知光を出射させるための故障検知光発光部と、前記光取出し手段側で反射した前記故障検知光を受光する受光部と、を有する故障検知手段が設けられており、前記故障検知光発光部は、前記光取出し手段側へ前記故障検知光を出射させる発光故障検知用光源と、前記故障検知用光源を作動させる作動手段と、を有し、前記受光部は、前記故障検知光発光部からの前記故障検知光と、前記光取出し手段からの前記通信光の一部と、をともに受光する共用受光部材であり、前記光取出し手段は、前記光伝送路と光結合する光ファイバが内蔵された接合体に設けられており、前記故障検知用光源は、前記接合体に臨むように設けられており、前記接合体に、前記故障検知用光源に臨む位置に切り欠き部が形成されており、かつ、前記故障検知光を前記受光部へ反射させるとともに、前記故障検知光が前記光ファイバに進入するのを防止するように反射部材が設けられていることを特徴とする通信光検知器を提供するものである。 In order to achieve the above object, the present invention provides a light extraction means for extracting a part of communication light that is provided at a portion connecting the optical transmission lines and transmitted by the optical transmission line, and the light extraction means. in communication light detector having a light detecting portion for detecting a portion of the communication light taken out by the optical detection unit, failure detection for emitting the fault detection light to the light extraction means side A failure detecting means having a light emitting portion and a light receiving portion that receives the failure detection light reflected on the light extracting means side, the failure detecting light emitting portion is provided to the light extracting means side; A light emission failure detection light source for emitting failure detection light; and an operating means for operating the failure detection light source, wherein the light receiving unit includes the failure detection light from the failure detection light emission unit, and the light. Before taking out A common light-receiving member that receives both part of the communication light, and the light extraction means is provided in a joined body in which an optical fiber that is optically coupled to the optical transmission path is built in, and the failure detection light source Is provided so as to face the joined body, the notched portion is formed in the joined body at a position facing the failure detection light source, and the failure detection light is reflected to the light receiving portion. In addition, a communication light detector is provided, wherein a reflection member is provided so as to prevent the failure detection light from entering the optical fiber .

前記故障検知光の波長帯域は、前記通信光の波長帯域と比較して狭帯域であるとよい。The wavelength band of the failure detection light may be narrower than the wavelength band of the communication light.

前記故障検知用光源の発光中心波長は、前記共用受光部材の受光波長帯の中心波長よりも短波長であるとよい。The light emission center wavelength of the failure detection light source may be shorter than the center wavelength of the light reception wavelength band of the shared light receiving member.

前記光取出し手段は、前記光ファイバの長手方向中央で、前記共用受光部材と対向する位置において、前記接合体の外側表面から前記光ファイバまでを横断するように形成されて、前記通信光の一部を漏れ光として取り出すための光検知用溝であるとよい。The light extraction means is formed so as to cross from the outer surface of the joined body to the optical fiber at a position facing the shared light receiving member at the center in the longitudinal direction of the optical fiber. It may be a light detection groove for extracting the portion as leakage light.

前記光検知用溝に、前記光ファイバのコアよりも屈折率が低く、かつ、前記光ファイバのクラッドよりも屈折率が低い屈折率を有する樹脂が充填されているとよい。The light detection groove may be filled with a resin having a refractive index lower than that of the core of the optical fiber and lower than that of the cladding of the optical fiber.

前記接合体に、前記共用受光部材に臨む位置に前記共用受光部材を収容する収容溝が形成されており、前記収容溝の底面から前記光ファイバまでを横断するように前記光検知用溝が形成されているとよい。An accommodation groove for accommodating the shared light receiving member is formed in the joint body at a position facing the shared light receiving member, and the light detection groove is formed so as to cross from the bottom surface of the accommodation groove to the optical fiber. It is good to be.

本発明によれば、通信光検知器自体の故障を検知できる通信光検知器を提供することができる。   According to the present invention, it is possible to provide a communication light detector that can detect a failure of the communication light detector itself.

本発明の一実施形態に係る通信光検知器の主要部の縦断面図である。It is a longitudinal cross-sectional view of the principal part of the communication light detector which concerns on one Embodiment of this invention. （ａ）〜（ｃ）は、図１の通信光検知器に用いた接合体の縦断面図であり、（ｄ）、（ｅ）は、（ａ）、（ｂ）中のＡ方向から見た上面図である。(A)-(c) is a longitudinal cross-sectional view of the joined body used for the communication light detector of FIG. 1, (d), (e) is seen from A direction in (a), (b). FIG. （ａ）〜（ｃ）は、図１の通信光検知器の主要部において、故障検知手段を作動させたときの状態を示す縦断面図である。(A)-(c) is a longitudinal cross-sectional view which shows the state when operating a failure detection means in the principal part of the communication light detector of FIG. 本発明の変形例に係る通信光検知器の主要部の縦断面図である。It is a longitudinal cross-sectional view of the principal part of the communication light detector which concerns on the modification of this invention. 本発明の変形例に係る通信光検知器の主要部の縦断面図である。It is a longitudinal cross-sectional view of the principal part of the communication light detector which concerns on the modification of this invention. 本発明の変形例に係る通信光検知器の主要部の縦断面図である。It is a longitudinal cross-sectional view of the principal part of the communication light detector which concerns on the modification of this invention. 本発明の変形例に係る通信光検知器の主要部の縦断面図である。It is a longitudinal cross-sectional view of the principal part of the communication light detector which concerns on the modification of this invention. 本発明の変形例に係る通信光検知器の主要部の縦断面図である。It is a longitudinal cross-sectional view of the principal part of the communication light detector which concerns on the modification of this invention. 図４に示した通信光検知器の縦断面斜視図である。It is a longitudinal cross-sectional perspective view of the communication light detector shown in FIG.

以下、本発明の一実施形態を添付図面に基づいて詳述する。   Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

図１（ａ）は、本実施形態に係る通信光検知器の主要部の縦断面図である。   FIG. 1A is a longitudinal sectional view of a main part of the communication light detector according to the present embodiment.

図１に示されるように、本実施形態に係る通信光検知器１は、光伝送路同士を接続する部分に設けられて光伝送路によって伝送される通信光の一部を取り出すための光取出し手段１３と、この光取出し手段１３によって取り出された通信光の一部を検知するための光検知部６とを有しており、光検知部６には、光取出し手段１３側へ故障検知光を出射させるための故障検知光発光部９（故障検知用光源７、作動手段８）と、光取出し手段１３側で反射した故障検知光を受光する受光部（受光部材４）と、を有する故障検知手段が設けられているものである。   As shown in FIG. 1, the communication light detector 1 according to the present embodiment is provided in a portion that connects optical transmission paths, and takes out a part of communication light transmitted through the optical transmission path. Means 13 and a light detector 6 for detecting a part of the communication light extracted by the light extraction means 13, and the light detection section 6 has a failure detection light to the light extraction means 13 side. Failure detection light emitting section 9 for emitting light (failure detection light source 7, operation means 8) and a light receiving section (light receiving member 4) for receiving the failure detection light reflected on the light extraction means 13 side Detection means is provided.

より詳細には、図１に示されるように、不可視光の通信光を伝送する光伝送路と光結合する光ファイバ２が内蔵された接合体３と、この接合体３に平行して配置され、接合体３に内蔵された光ファイバ２によって伝送される通信光の一部を受光する受光部材４、及び受光部材４で受光した不可視光である通信光の一部を可視光によって出力する光出力部材５を有する光検知部６とを備える。   More specifically, as shown in FIG. 1, a joined body 3 in which an optical fiber 2 that is optically coupled to an optical transmission path for transmitting invisible communication light is built in, and arranged in parallel to the joined body 3. The light receiving member 4 that receives a part of communication light transmitted by the optical fiber 2 built in the joined body 3 and the light that outputs a part of the communication light that is invisible light received by the light receiving member 4 by visible light. A light detection unit 6 having an output member 5.

そして、光検知部６には、接合体３の方向（光取出し手段１３側）へ故障検知光を出射させるための故障検知用光源７と、故障検知光を出射させるために故障検知用光源７を発光させるための作動手段（スイッチ）８とからなる故障検知光発光部９が設けられている。   The light detection unit 6 includes a failure detection light source 7 for emitting failure detection light in the direction of the joined body 3 (on the light extraction means 13 side), and a failure detection light source 7 for emitting failure detection light. Is provided with a failure detection light emitting unit 9 including an operating means (switch) 8 for emitting light.

通信光の波長は、例えば、波長９４０ｎｍ〜１５００ｎｍの広帯域内において適宜な単数または複数の波長が使用される。受光部材４の受光波長帯は、上記通信光の全帯域を包含することにより、どの波長で通信光が伝送されていても検知が可能である。受光部材４には、ＰＤ（フォトダイオード）を用いるとよい。   As the wavelength of the communication light, for example, an appropriate single wavelength or a plurality of wavelengths are used within a wide band of wavelengths from 940 nm to 1500 nm. The light receiving wavelength band of the light receiving member 4 includes the entire band of the communication light, so that it can be detected regardless of the wavelength at which the communication light is transmitted. PD (photodiode) may be used for the light receiving member 4.

これに対し、故障検知光の波長は、受光部材４の受光動作を確認できればよいので、上記通信光の帯域を全て包含する必要はなく、狭帯域でよい。ここでは、故障検知用光源７の発光中心波長は、受光部材４の受光波長帯の中心波長よりも短波長とする。具体的には、故障検知用光源７には、波長９４０ｎｍの赤外ＬＥＤを用いるとよい。光出力部材５には、適宜な色のＬＥＤを用いるとよい。 On the other hand, the wavelength of the failure detection light only needs to be able to confirm the light receiving operation of the light receiving member 4, so it is not necessary to include all the bands of the communication light and may be a narrow band. Here, the light emission center wavelength of the failure detection light source 7 is shorter than the center wavelength of the light reception wavelength band of the light receiving member 4. Specifically, an infrared LED having a wavelength of 940 nm may be used as the failure detection light source 7. As the light output member 5, an LED of an appropriate color may be used.

なお、本実施形態に係る受光部材４は、故障検知用光源７からの故障検知光と、光取出し手段１３からの通信光の一部とをともに受光する共用受光部材である。   The light receiving member 4 according to the present embodiment is a shared light receiving member that receives both failure detection light from the failure detection light source 7 and part of communication light from the light extraction means 13.

通信光検知器１は、光通信関連設備に布設された光伝送路の途中に設けられる。すなわち、接合体３の両端面には、通信光検知器１の使用時に、設備側の光コネクタが備えるフェルール１０ｃとユーザ側の光コネクタが備えるフェルール１０ｙがそれぞれ挿入されて突き合わせ接続される。フェルール１０ｃには光伝送路である設備側の光ファイバ１１ｃが内蔵され、フェルール１０ｙには光伝送路であるユーザ側の光ファイバ１１ｙが内蔵される。   The communication light detector 1 is provided in the middle of an optical transmission line installed in an optical communication-related facility. That is, when the communication light detector 1 is used, the ferrule 10c included in the equipment-side optical connector and the ferrule 10y included in the user-side optical connector are respectively inserted into and butt-connected to both end faces of the joined body 3. The ferrule 10c incorporates an optical fiber 11c on the facility side that is an optical transmission path, and the ferrule 10y incorporates an optical fiber 11y on the user side that is an optical transmission path.

また、接合体３の両端部は、それぞれスリーブ１２ａ、１２ｂに挿入され、固定されている。スリーブ１２ａは、フェルール１０ｃと接合体３の光軸位置合わせをするためのものであり、スリーブ１２ｂは、フェルール１０ｙと接合体３の光軸位置合わせをするためのものである。つまり、接合体３内において、光ファイバ２が光伝送路である光ファイバ１１ｃ、１１ｙと同一直線上となるように配置されている。   Further, both end portions of the joined body 3 are inserted and fixed to the sleeves 12a and 12b, respectively. The sleeve 12a is for aligning the optical axis of the ferrule 10c and the joined body 3, and the sleeve 12b is for aligning the optical axis of the ferrule 10y and the joined body 3. That is, in the joined body 3, the optical fiber 2 is arranged so as to be on the same straight line as the optical fibers 11c and 11y that are optical transmission paths.

光ファイバ２や光ファイバ１１ｃ、１１ｙとしては、石英ガラス製のシングルモード光ファイバやＧＩ（グレートインデックス）型のマルチモード光ファイバを用いるとよい。光ファイバ２の外径は、４０μｍ〜１２５μｍ、好ましくは４０μｍ〜８０μｍであるとよい。   As the optical fiber 2 and the optical fibers 11c and 11y, a single mode optical fiber made of quartz glass or a GI (Great Index) type multimode optical fiber may be used. The outer diameter of the optical fiber 2 is 40 μm to 125 μm, preferably 40 μm to 80 μm.

（接合体）
接合体３は、光ファイバ１１ｃ、１１ｙの端部（光ファイバの接続部側の端部）同士と突き合わせ接続される光ファイバ２が内蔵されたフェルールからなる。
そして、接合体３には、光ファイバ２を伝送する通信光の一部を取り出すための光取出し手段１３が設けられている。この光取出し手段１３は、光ファイバ２のコアよりも屈折率が低いものからなる。 (Joint)
The joined body 3 is made of a ferrule in which an optical fiber 2 that is butt-connected to the ends of the optical fibers 11c and 11y (ends on the optical fiber connecting portion side) is built.
The joined body 3 is provided with light extraction means 13 for extracting a part of communication light transmitted through the optical fiber 2. The light extraction means 13 is made of a material having a refractive index lower than that of the core of the optical fiber 2.

光取出し手段１３としては、例えば、接合体３の光ファイバ２の長手方向中央で、受光部材４と対向する位置において、接合体３の外側表面から光ファイバ２までを横断するように形成されて、通信光の一部を漏れ光として取り出すための光検知用溝が挙げられる。この光検知用溝は、接合体３の受光部材４と対向する位置に、受光部材４の受光面に対して垂直に形成されることが好ましい。なお、光検知用溝は、例えば、ブレードによるダイシング、あるいはエッチングなどの加工手段により形成される。   The light extraction means 13 is formed, for example, so as to cross from the outer surface of the bonded body 3 to the optical fiber 2 at a position facing the light receiving member 4 at the center in the longitudinal direction of the optical fiber 2 of the bonded body 3. And a light detection groove for extracting a part of communication light as leakage light. This light detection groove is preferably formed perpendicular to the light receiving surface of the light receiving member 4 at a position facing the light receiving member 4 of the joined body 3. The light detection groove is formed by a processing means such as dicing with a blade or etching.

この光検知用溝は、その内部が真空であってもよいが、光ファイバ２のコアよりも屈折率が低い屈折率を有する樹脂が充填されていることが好ましい。この樹脂は、液状のものを使用しても良いし、熱硬化性や紫外線（ＵＶ）硬化性の樹脂、あるいは接着剤で、硬化後の屈折率が光ファイバ２のコアの屈折率よりも低いものを使用してもよい。また、光検知用溝に充填される樹脂は、光ファイバ２のコアよりも屈折率が低く、かつ、光ファイバ２のクラッドよりも屈折率が低い屈折率を有することがより好ましい。   The inside of the light detection groove may be vacuum, but is preferably filled with a resin having a refractive index lower than that of the core of the optical fiber 2. This resin may be in the form of a liquid, is a thermosetting or ultraviolet (UV) curable resin, or an adhesive, and the refractive index after curing is lower than the refractive index of the core of the optical fiber 2. Things may be used. Further, it is more preferable that the resin filled in the light detection groove has a refractive index lower than that of the core of the optical fiber 2 and lower than that of the cladding of the optical fiber 2.

本実施形態では、フェルールからなる接合体３に、受光部材４に臨む位置（長手方向の中央）に受光部材４を収容する収容溝１４が形成されており、この収容溝１４の底面から光ファイバ２までを横断するように光検知用溝を形成した。このような構造とすることにより、受光部材４の受光側の端面を光ファイバ３に近づけて光検出感度を向上させることができる。   In this embodiment, a housing groove 14 for housing the light receiving member 4 is formed in the joined body 3 made of a ferrule at a position facing the light receiving member 4 (the center in the longitudinal direction), and an optical fiber is formed from the bottom surface of the housing groove 14. Light detection grooves were formed so as to cross up to 2. With such a structure, it is possible to improve the light detection sensitivity by bringing the light receiving side end face of the light receiving member 4 closer to the optical fiber 3.

また、接合体３としては、通信光の少なくとも一部を透過し、かつ、通信光を受光するとこれを散乱するセラミックス製やガラス製のフェルールを用いるとよい。本実施形態では、接合体３として、ジルコニアセラミックスからなるフェルールを用いた。   Moreover, as the joined body 3, it is preferable to use a ceramic or glass ferrule that transmits at least part of the communication light and scatters the communication light when it is received. In this embodiment, a ferrule made of zirconia ceramics is used as the bonded body 3.

図２（ａ）〜（ｃ）は、図１の通信光検知器の主要部に用いた接合体の縦断面図であり、（ｄ）、（ｅ）は、（ａ）、（ｂ）中のＡ方向から見た上面図である。   2 (a) to 2 (c) are longitudinal sectional views of a joined body used in the main part of the communication light detector of FIG. 1, and (d) and (e) are in (a) and (b). It is the top view seen from A direction.

図２（ａ）、（ｂ）に示すように、光取出し手段１３としての光検知用溝は、縦断面視で矩形状（凹状）、あるいはＶ字状に形成されることが好ましい。また、図２（ｄ）に示すように、光取出し手段１３としての光検知用溝を光ファイバ２の光軸の方向に対して垂直に形成してもよく、また、図２（ｅ）に示すように、光検知用溝は、光ファイバ２の光軸の方向に対して斜めに交差するように傾斜させて形成してもよい。このように光検知用溝を斜めに交差するように形成することにより、光ファイバ２のコアと光検知用溝に充填された樹脂との屈折率の違いによって反射が生じるのを抑制することができると共に、通信光からの漏れ光の指向性を向上させて光検出感度を向上させることができる。   As shown in FIGS. 2A and 2B, the light detection groove as the light extraction means 13 is preferably formed in a rectangular shape (concave shape) or a V shape in a longitudinal sectional view. Further, as shown in FIG. 2 (d), a light detection groove as the light extraction means 13 may be formed perpendicular to the direction of the optical axis of the optical fiber 2, and FIG. As shown, the light detection groove may be formed so as to be inclined so as to obliquely intersect the direction of the optical axis of the optical fiber 2. By thus forming the light detection grooves so as to cross obliquely, it is possible to suppress the occurrence of reflection due to the difference in refractive index between the core of the optical fiber 2 and the resin filled in the light detection grooves. In addition, the light detection sensitivity can be improved by improving the directivity of leakage light from the communication light.

（光検知部）
図１において、光検知部６は、接合体３の上方に接合体３に平行して配置され、接合体３に設けられた光取出し手段１３によって光ファイバ２から漏れ出る通信光の一部（漏れ光）を受光する受光部材４と、受光部材４で受光した漏れ光を可視光によって出力する光出力部材５と、これら受光部材４及び光出力部材５が搭載されて光検知回路を構成する回路基板１５とを備える。 (Light detector)
In FIG. 1, the light detection unit 6 is arranged above the joined body 3 in parallel with the joined body 3, and a part of communication light leaking from the optical fiber 2 by the light extraction means 13 provided in the joined body 3 ( The light receiving member 4 that receives the leakage light), the light output member 5 that outputs the leakage light received by the light receiving member 4 by visible light, and the light receiving member 4 and the light output member 5 are mounted to constitute a light detection circuit. And a circuit board 15.

この光検知部６は、故障検知用光源７からの故障検知光と、光取出し手段１３からの通信光の一部とをともに受光する受光部材４を有することが好ましい。
受光部材６は回路基板１５の下方の面に光取出し手段（光検知用溝）１３と対向するように搭載され、光出力部材５は、回路基板１５の上方の面に搭載されている。すなわち、受光部材４は、回路基板１５の片側面に実装され、光出力部材５は、回路基板１５の反対側面に実装される。 The light detection unit 6 preferably includes a light receiving member 4 that receives both failure detection light from the failure detection light source 7 and part of communication light from the light extraction unit 13.
The light receiving member 6 is mounted on the lower surface of the circuit board 15 so as to face the light extraction means (light detection groove) 13, and the light output member 5 is mounted on the upper surface of the circuit board 15. That is, the light receiving member 4 is mounted on one side of the circuit board 15, and the light output member 5 is mounted on the opposite side of the circuit board 15.

受光部材４としては、受光素子としてのＰＤ素子１６を備えたＰＤ１７を用いた。本実施形態において、ＰＤ１７は、ＰＤ素子１６が光取出し手段１３となる光検知用溝の上方に対向するように、収容溝１４に収容される。また、本実施形態では、ＰＤ１７として安価なＣａｎパッケージタイプのものを用いた。   As the light receiving member 4, a PD 17 provided with a PD element 16 as a light receiving element was used. In the present embodiment, the PD 17 is accommodated in the accommodation groove 14 so that the PD element 16 faces the upper side of the light detection groove serving as the light extraction means 13. In this embodiment, an inexpensive can package type PD 17 is used.

図１に示すように、接合体３に設けられた収容溝１４に受光部材４が収容された状態において、ＰＤ素子１６の受光面が光ファイバ２の径方向外方から光取出し手段１３である光検知用溝に正対して位置する。一方、光検知用溝は収容溝１４に達するまで形成されている。これにより、光取出し手段１３である光検知用溝で分離されて漏洩する通信光の一部がＰＤ素子１６の受光面に入射しやすいようになっている。   As shown in FIG. 1, the light receiving surface of the PD element 16 is the light extraction means 13 from the outside in the radial direction of the optical fiber 2 in a state where the light receiving member 4 is housed in the housing groove 14 provided in the joined body 3. Located directly opposite the light detection groove. On the other hand, the light detection groove is formed until it reaches the accommodation groove 14. As a result, part of the communication light that is separated and leaked by the light detection groove serving as the light extraction means 13 is likely to enter the light receiving surface of the PD element 16.

また、本実施形態における光出力部材５としては、通信光が光ファイバ１１ｃ、１１ｙ間を伝送しているときに点灯し、伝送していないときに消灯するとともに、故障検知用光源７から入射された故障検知光が受光部材４にて受光された場合に点灯するものが好ましい。   The light output member 5 in this embodiment is turned on when communication light is transmitted between the optical fibers 11c and 11y, turned off when not transmitted, and incident from the failure detection light source 7. It is preferable to turn on when the failure detection light received by the light receiving member 4 is received.

（故障検知手段）
光検知部６には、光取出し手段１３側へ故障検知光を出射させるための故障検知光発光部９（故障検知用光源７、作動手段８）と、光取出し手段側で反射した故障検知光を受光する受光部（受光部材４）と、を有する故障検知手段が設けられている。この故障検知光発光部９は、光取出し手段１３側へ故障検知光を出射させるための故障検知用光源７と、この故障検知用光源７を作動させるための作動手段（スイッチ）８とを有しており、光検知回路を構成する回路基板１５に設けられている。 (Failure detection means)
The light detection unit 6 includes a failure detection light emitting unit 9 (failure detection light source 7, operating means 8) for emitting failure detection light to the light extraction unit 13 side, and failure detection light reflected on the light extraction unit side. And a light detecting unit (light receiving member 4) for receiving light. The failure detection light emitting section 9 has a failure detection light source 7 for emitting failure detection light to the light extraction means 13 side, and an operating means (switch) 8 for operating the failure detection light source 7. And provided on the circuit board 15 constituting the photodetection circuit.

故障検知用光源７は、受光部材４と並列に配置されており、また、光取出し手段（光検知用溝）１３に対して光ファイバ２の長手方向にずれた位置において接合体３の外側表面に臨むように設けられている。故障検知用光源７は指向角が比較的大きいＬＥＤからなるため、故障検知用光源７から接合体３へ入射される際に、フェルールからなる接合体３へ比較的広角度で拡散するようになっている。   The failure detection light source 7 is arranged in parallel with the light receiving member 4, and the outer surface of the joined body 3 at a position shifted in the longitudinal direction of the optical fiber 2 with respect to the light extraction means (light detection groove) 13. It is provided to face. Since the failure detection light source 7 is made of an LED having a relatively large directivity angle, when the failure detection light source 7 is incident on the joined body 3, the failure detection light source 7 diffuses into the joined body 3 made of a ferrule at a relatively wide angle. ing.

ここで、通信光検知器１において通信光を検知する際の動作を簡単に述べる。   Here, the operation when the communication light detector 1 detects the communication light will be briefly described.

光伝送路（例えば、図１の光ファイバ１１ｃ、１１ｙ）によって不可視光からなる通信光が伝送されているとき、光伝送路によって伝送される通信光の一部が接合体３に形成された光取り出し手段（光検知用溝）１３によって漏れ出し、漏れ出した通信光の一部（漏れ光）が受光部材４で受光される。受光部材４で受光された漏れ光が可視光に変換され、回路基板１５を介して光出力部材５によって出力される。   When communication light composed of invisible light is transmitted through an optical transmission path (for example, the optical fibers 11c and 11y in FIG. 1), a part of the communication light transmitted through the optical transmission path is formed in the joined body 3. Leakage is caused by the extraction means (light detection groove) 13, and part of the leaked communication light (leakage light) is received by the light receiving member 4. The leaked light received by the light receiving member 4 is converted into visible light and output by the light output member 5 through the circuit board 15.

一方、光伝送路によって通信光が伝送されていない状態であるときは、通信光が接合体３内の光ファイバ２を伝送しないので、通信光の漏れ光が受光部材４で受光されず、光出力部材５で可視光は出力されない。   On the other hand, when the communication light is not transmitted through the optical transmission path, the communication light is not transmitted through the optical fiber 2 in the joined body 3, so that the leakage light of the communication light is not received by the light receiving member 4 and the light Visible light is not output from the output member 5.

受光部材４の不具合などで通信光検知器１が故障している、つまり、光検知部６を構成する受光部材４、光出力部５、あるいは回路基板１５が故障しているときは、光伝送路によって通信光が伝送されている状態であっても、通信光の一部（漏れ光）が光出力部材５において可視光として出力されない。したがって、作業者は、通信光が伝送されていない状態なのか、通信光検知器１が故障しているのかが判断できないことになる。   If the communication light detector 1 is out of order due to a failure of the light receiving member 4, that is, if the light receiving member 4, the light output unit 5, or the circuit board 15 constituting the light detecting unit 6 is out of order, optical transmission is performed. Even in a state where communication light is transmitted through the path, a part of the communication light (leakage light) is not output as visible light in the light output member 5. Therefore, the operator cannot determine whether the communication light is not transmitted or whether the communication light detector 1 is broken.

これを判別するために、本実施形態では、通信光検知器１の主要部である接合体３へ積極的に故障検知光を入射させることにより、通信光検知器１自体が故障しているかどうかの確認を行う構成とした。   In order to determine this, in the present embodiment, whether or not the communication light detector 1 itself has failed by actively making the failure detection light incident on the joined body 3 that is the main part of the communication light detector 1. It was set as the structure which confirms.

以下、本発明に係る通信光検知器１における故障検知の動作を説明する。   Hereinafter, the operation of failure detection in the communication light detector 1 according to the present invention will be described.

図３（ａ）〜（ｃ）は、図１の通信光検知器の主要部において、故障検知手段を作動させたときの状態を示す縦断面図である。   FIGS. 3A to 3C are longitudinal sectional views showing a state when the failure detection means is operated in the main part of the communication light detector of FIG.

図３（ａ）に示されるように、通信光検知器１自体の故障を調べるために、作業者は、通信光検知器１に設けられ、通信光検知器１の主要部である接合体３へ積極的に故障検知光を入射させるための故障検知用光源７を作動させるために、作動手段（スイッチ）８を押す。スイッチ８が押されると、故障検知用光源７が作動される、すなわち、故障検知用光源７が発光して、接合体３の光取出し手段１３側へ故障検知光が入射される。   As shown in FIG. 3A, in order to investigate the failure of the communication light detector 1 itself, an operator is provided in the communication light detector 1 and the joined body 3 that is a main part of the communication light detector 1. In order to actuate the failure detection light source 7 for making the failure detection light incident on the device, an operating means (switch) 8 is pushed. When the switch 8 is pressed, the failure detection light source 7 is activated, that is, the failure detection light source 7 emits light, and the failure detection light is incident on the light extraction means 13 side of the joined body 3.

次に、図３（ｂ）に示されるように、故障検知用光源７が発光して接合体３の光取出し手段１３側へ入射された故障検知光は、フェルールからなる接合体３内を比較的広角度で拡散し、その一部は収容溝１４の底面１８まで入射し、この収容溝１４の底面１８で故障検知光の一部が受光部材４の方向へと反射される。   Next, as shown in FIG. 3B, the failure detection light emitted from the failure detection light source 7 and incident on the light extraction means 13 side of the joined body 3 is compared in the joined body 3 made of ferrules. A part of the light is diffused to the bottom surface 18 of the housing groove 14, and a part of the failure detection light is reflected toward the light receiving member 4 by the bottom surface 18 of the housing groove 14.

そして、図２（ｃ）に示されるように、収容溝１４の底面１８で反射された故障検知光は、受光部材４に設けられたＰＤ素子１６の受光面に所望の角度で入射し、受光される。受光部材４にて受光された故障検知光は、回路基板１５を介して光出力部材５において可視光として点灯（出力）される。   As shown in FIG. 2C, the failure detection light reflected by the bottom surface 18 of the receiving groove 14 enters the light receiving surface of the PD element 16 provided in the light receiving member 4 at a desired angle, and receives light. Is done. The failure detection light received by the light receiving member 4 is lit (output) as visible light at the light output member 5 via the circuit board 15.

このような動作を行った状態において、故障検知光を入射したことによって光出力部材５が点灯（出力）した場合、作業者は、光出力部材５から出力される可視光によって受光部材４や光出力部材５などが故障していない、すなわち通信光検知器自体が故障していないと判断することができる。これにより、光伝送路を通信光が伝送していないことがわかる。   When the light output member 5 is turned on (output) due to the incident of the failure detection light in the state in which such an operation is performed, the operator can detect the light receiving member 4 and the light by the visible light output from the light output member 5. It can be determined that the output member 5 or the like has not failed, that is, the communication light detector itself has not failed. Thereby, it is understood that communication light is not transmitted through the optical transmission line.

一方、故障検知光を入射しても光出力部材５が点灯（出力）しない場合、作業者は、受光部材４や光出力部材５などが故障している、すなわち通信光検知器自体が故障していると判断することができる。   On the other hand, if the light output member 5 does not turn on (output) even when the failure detection light is incident, the worker has failed in the light receiving member 4 or the light output member 5, that is, the communication light detector itself has failed. Can be determined.

なお、図３では、故障検知用光源７が発光して入射された故障検知光が、接合体３へ直進して収容溝１４の底面１８で反射し、直進して受光部材４に入射する状態を示したが、実際の故障検知光は、上記のように直進して受光部材４に到達する他に、散乱や複数回の反射など多様な経路を経て受光部材４に到達するものもある。   In FIG. 3, the failure detection light that is emitted and incident from the failure detection light source 7 travels straight to the joined body 3, is reflected by the bottom surface 18 of the receiving groove 14, and travels straight and enters the light receiving member 4. Although the actual failure detection light travels straight as described above and reaches the light receiving member 4, there are some light that reaches the light receiving member 4 through various paths such as scattering and multiple reflections.

以上のように、本発明の通信光検知器１は、故障検知光を発光させる故障検知用光源７と、この故障検知用光源７を作動させるための作動手段（スイッチ）８を備えるので、スイッチ８を操作することで簡単に通信光検知器自体の故障の有無を判断することができる。これにより、作業者は、通信光検知器１自体が故障しているときに、通信光が伝送されている光伝送路に対して通信光が伝送されていない状態であると誤認することがなくなり、光コネクタを抜いてしまうなどの不具合が防止される。   As described above, the communication light detector 1 of the present invention includes the failure detection light source 7 that emits the failure detection light and the operation means (switch) 8 for operating the failure detection light source 7. By operating No. 8, it is possible to easily determine whether or not the communication light detector itself has failed. Thereby, when the communication light detector 1 itself is out of order, the worker does not mistakenly recognize that the communication light is not transmitted to the optical transmission path through which the communication light is transmitted. Problems such as disconnecting the optical connector are prevented.

故障検知用光源７としては、例えば、ＬＥＤは、各種のリモコン装置に利用されているものを適用することができ、その中でも赤外光領域の短波長側に発光域を有するものが安価で好適である。   As the failure detection light source 7, for example, an LED that is used in various remote control devices can be applied, and among them, an LED having a light emitting region on the short wavelength side of the infrared light region is inexpensive and suitable. It is.

次に、本発明の他の実施形態を説明する。   Next, another embodiment of the present invention will be described.

本発明では、図１、図２（ａ）、（ｂ）で説明した接合体を、図２（ｃ）に示したフェルールギャップ方式の接合体としてもよい。すなわち、互いに光ファイバ２ａ、２ｂが内蔵されている接合体３ａ、３ｂが、所定の長さの間隙２１３を隔てて配置されている。この構成においては、光ファイバ２を伝送する通信光の一部を取り出すための光取出し手段が接合体３ａ、３ｂの間の間隙２１３となり、この間隙２１３は、光ファイバ２ａ、２ｂのコアよりも屈折率が低くなる。この間隙２１３の内部は、真空であってもよいが、光ファイバ２ａ、２ｂのコアよりも屈折率が低い屈折率を有する樹脂が充填されていることが好ましい。この樹脂は、液状のものを使用しても良いし、熱硬化性や紫外線（ＵＶ）硬化性の樹脂、あるいは接着剤で、硬化後の屈折率が光ファイバ２ａ、２ｂのコアの屈折率よりも低いものを使用してもよい。また、接合体３ａ，３ｂは、その一端側を一括して覆うように固定するためのスリーブ１９が設けられていることが好ましい。   In the present invention, the joined body described in FIGS. 1, 2A, and 2B may be the ferrule gap system joined body shown in FIG. 2C. That is, the joined bodies 3a and 3b each containing the optical fibers 2a and 2b are arranged with a gap 213 having a predetermined length. In this configuration, the light extraction means for extracting a part of the communication light transmitted through the optical fiber 2 becomes the gap 213 between the joined bodies 3a and 3b, and this gap 213 is larger than the core of the optical fibers 2a and 2b. The refractive index is lowered. The inside of the gap 213 may be a vacuum, but is preferably filled with a resin having a refractive index lower than that of the cores of the optical fibers 2a and 2b. This resin may be in the form of a liquid, is a thermosetting or ultraviolet (UV) curable resin, or an adhesive, and the refractive index after curing is higher than the refractive index of the core of the optical fibers 2a and 2b. A lower one may also be used. Moreover, it is preferable that the joined bodies 3a and 3b are provided with a sleeve 19 for fixing so as to collectively cover one end side thereof.

図４は、本発明の変形例に係る通信光検知器の主要部の縦断面図である。   FIG. 4 is a longitudinal sectional view of a main part of a communication light detector according to a modification of the present invention.

図４に示される通信光検知器４１は、図１の通信光検知器１に切り欠き部２０を追加形成したものである。すなわち、接合体３の故障検知用光源７に臨む位置に切り欠き部２０が形成されている。   A communication light detector 41 shown in FIG. 4 is obtained by additionally forming a notch 20 in the communication light detector 1 of FIG. That is, the notch 20 is formed at a position of the joined body 3 facing the failure detection light source 7.

切り欠き部２０は、側面視で断面が四角形に形成される。ここでは、切り欠き部２０が収容溝１４に直接隣接しており、切り欠き部２０と収容溝１４は境界なく空間が続く。切り欠き部２０の底面（図４において光ファイバ２に平行な面を言う）１８は、接合体３と空気との境界面であるため、光を反射しやすく、故障検知用光源７からの故障検知光を受光部材４に反射する反射面となっている。   The cutout 20 has a quadrangular cross section when viewed from the side. Here, the notch 20 is directly adjacent to the receiving groove 14, and the notch 20 and the receiving groove 14 have a space without a boundary. The bottom surface 18 (referred to as a surface parallel to the optical fiber 2 in FIG. 4) 18 of the cutout portion 20 is a boundary surface between the joined body 3 and the air, and therefore easily reflects light, and the failure from the failure detection light source 7 It is a reflection surface that reflects the detection light to the light receiving member 4.

また、図４の通信光検知器４１は、故障検知用光源７に臨む位置に切り欠き部２０があるため、故障検知用光源７で発光されて接合体３に入射した故障検知光は、切り欠き部２０内の空間を伝搬し、その一部は切り欠き部２０の底面１８に所望の角度で入射する。故障検知光が切り欠き部２０内の空間を伝搬すると共に、底面１８で反射されるので、図１の通信光検知器に比べて、受光部材４に入射する故障検知光の光量を多くできる。受光部材４における受光光量を一定とするならば、故障検知用光源７で発光させる故障検知光の光量を少なくさせることができる。これによって、光ファイバ２へ漏れ込む故障検知光を低減させることができるため、光伝送路中の光パワーが漏れ込んだ故障検知光のために変動して通信障害となることが防止される。   4 has the notch 20 at the position facing the failure detection light source 7, the failure detection light emitted from the failure detection light source 7 and incident on the joined body 3 is cut off. The light propagates through the space in the notch 20, and a part of the light enters the bottom surface 18 of the notch 20 at a desired angle. Since the failure detection light propagates through the space in the notch 20 and is reflected by the bottom surface 18, the amount of failure detection light incident on the light receiving member 4 can be increased as compared with the communication light detector of FIG. 1. If the amount of light received by the light receiving member 4 is constant, the amount of failure detection light emitted by the failure detection light source 7 can be reduced. As a result, the failure detection light leaking into the optical fiber 2 can be reduced, so that the optical power in the optical transmission path can be prevented from fluctuating due to the leaked failure detection light and causing a communication failure.

図５は、本発明の変形例に係る通信光検知器の主要部の縦断面図である。   FIG. 5 is a longitudinal sectional view of a main part of a communication light detector according to a modification of the present invention.

図５に示される通信光検知器５１は、図１の通信光検知器において、接合体３の替わりに収容溝１４が形成されていない接合体５３を適用したものである。この変形例においては、光取出し手段５１３としての光検知用溝が光ファイバ２から接合体５３の外表面までにわたり形成されている。また、受光部材４は、接合体５３の外表面に接して配置され、ＰＤ素子１６の受光面が光取出し手段５１３としての光検知用溝に正対するようになっている。なお、この通信光検知器５１にも、図４と同様に切り欠き部５２０を形成してもよい。   A communication light detector 51 shown in FIG. 5 is a communication light detector shown in FIG. 1 to which a joined body 53 in which the accommodation groove 14 is not formed is applied instead of the joined body 3. In this modification, a light detection groove as the light extraction means 513 is formed from the optical fiber 2 to the outer surface of the joined body 53. The light receiving member 4 is disposed in contact with the outer surface of the joined body 53 so that the light receiving surface of the PD element 16 faces the light detection groove as the light extraction means 513. Note that the communication light detector 51 may also have a notch 520 as in FIG.

図６は、本発明の変形例に係る通信光検知器の主要部の縦断面図である。   FIG. 6 is a longitudinal sectional view of a main part of a communication light detector according to a modification of the present invention.

図６に示される通信光検知器６１は、図１の通信光検知器において、接合体３の替わりに図２（ｃ）で説明したフェルールギャップ方式の接合体を適用したものである。この場合、受光部材４はスリーブ１９の外表面に接して配置され、ＰＤ素子１６の受光面が光取出し手段としての間隙２１３に正対するように配置されている。また、この通信光検知器６１にも、図４と同様に切り欠き部６２０を形成してもよい。   A communication light detector 61 shown in FIG. 6 is obtained by applying the ferrule gap type bonded body described in FIG. 2C instead of the bonded body 3 in the communication light detector of FIG. In this case, the light receiving member 4 is disposed in contact with the outer surface of the sleeve 19, and the light receiving surface of the PD element 16 is disposed so as to face the gap 213 as the light extraction means. Also, the communication light detector 61 may be formed with a notch 620 as in FIG.

図７は、本発明の変形例に係る通信光検知器の主要部の縦断面図である。   FIG. 7 is a longitudinal sectional view of a main part of a communication light detector according to a modification of the present invention.

図７に示される通信光検知器７１は、図４の通信光検知器４１において、故障検知用光源７と対向する位置の底面１８上に反射部材２１を設けたものである。反射部材２１は、収容溝１４から切り欠き部２０へかけての底面１８に金膜または多層膜フィルタを設けることにより形成される。   The communication light detector 71 shown in FIG. 7 is obtained by providing the reflection member 21 on the bottom surface 18 at a position facing the failure detection light source 7 in the communication light detector 41 of FIG. The reflection member 21 is formed by providing a gold film or a multilayer filter on the bottom surface 18 from the accommodation groove 14 to the notch 20.

このような反射部材２１を設けたことにより、故障検知用光源７から発光した故障検知光を効率よく受光部材４の方向へ導光させることができるとともに、故障検知用光源７で発光された故障検知光が接合体３内に設けられた光ファイバ２に進入するのを防止することができるため、光伝送路中の光パワーが故障検知光の進入することによって変動し、通信障害が発生するのを防止することができる。   By providing such a reflecting member 21, the failure detection light emitted from the failure detection light source 7 can be efficiently guided in the direction of the light receiving member 4, and the failure emitted from the failure detection light source 7. Since it is possible to prevent the detection light from entering the optical fiber 2 provided in the joined body 3, the optical power in the optical transmission path fluctuates when the failure detection light enters, resulting in a communication failure. Can be prevented.

図８は、本発明の変形例に係る通信光検知器の主要部の縦断面図である。   FIG. 8 is a longitudinal sectional view of a main part of a communication light detector according to a modification of the present invention.

図８に示される通信光検知器８１は、図４の通信光検知器４１において、接合体３の回路基板１５を設けた側（上面側）とは反対側（下面側）の外表面に反射部材２１を設けたものである。図８の反射部材２１は、図７と同様、故障検知用光源７から発光した故障検知用光を効率よく受光部材４の方向へ導光させることができる。   The communication light detector 81 shown in FIG. 8 reflects on the outer surface of the communication light detector 41 of FIG. 4 on the side (upper surface side) opposite to the side (upper surface side) where the circuit board 15 is provided. The member 21 is provided. The reflection member 21 in FIG. 8 can efficiently guide the failure detection light emitted from the failure detection light source 7 toward the light receiving member 4 as in FIG.

図９は、図４に示した通信光検知器の縦断面斜視図である。   9 is a longitudinal sectional perspective view of the communication light detector shown in FIG.

図９に示される通信光検知器９１は、図４に示した通信光検知器４１の主要部の周囲に、主要部を保護するための外装２２を設けたものである。接合体３には切り欠き部２０と収容溝１４が境界なく形成されており、受光部材４が収容溝１４の底面に臨ませて配置され、故障検知用光源７は切り欠き部２０に臨ませて配置されている。   The communication light detector 91 shown in FIG. 9 is provided with an exterior 22 for protecting the main part around the main part of the communication light detector 41 shown in FIG. The joined body 3 is formed with a notch 20 and an accommodation groove 14 without a boundary, the light receiving member 4 is disposed facing the bottom surface of the accommodation groove 14, and the failure detection light source 7 faces the notch 20. Are arranged.

１ 通信光検知器
２ 光ファイバ
３ 接合体
４ 受光部材
５ 光出力部材
６ 光検知部
７ 故障検知用光源
８ 作動手段（スイッチ）
９ 故障検知光発光部
１３ 光取出し手段 DESCRIPTION OF SYMBOLS 1 Communication light detector 2 Optical fiber 3 Joint body 4 Light receiving member 5 Light output member 6 Light detection part 7 Light source for failure detection 8 Actuating means (switch)
9 Failure detection light emitting part 13 Light extraction means

Claims (6)

光伝送路同士を接続する部分に設けられて前記光伝送路によって伝送される通信光の一部を取り出すための光取出し手段と、
前記光取出し手段によって取り出された前記通信光の一部を検知するための光検知部と、
を有する通信光検知器において、
前記光検知部に、
前記光取出し手段側へ故障検知光を出射させるための故障検知光発光部と、
前記光取出し手段側で反射した前記故障検知光を受光する受光部と、
を有する故障検知手段
が設けられており、
前記故障検知光発光部は、
前記光取出し手段側へ前記故障検知光を出射させる発光故障検知用光源と、
前記故障検知用光源を作動させる作動手段と、
を有し、
前記受光部は、
前記故障検知光発光部からの前記故障検知光と、
前記光取出し手段からの前記通信光の一部と、
をともに受光する共用受光部材であり、
前記光取出し手段は、
前記光伝送路と光結合する光ファイバが内蔵された接合体に設けられており、
前記故障検知用光源は、
前記接合体に臨むように設けられており、
前記接合体に、
前記故障検知用光源に臨む位置に切り欠き部が形成されており、
かつ、前記故障検知光を前記受光部材へ反射させるとともに、前記故障検知光が前記光ファイバに進入するのを防止するように反射部材が設けられている
ことを特徴とする通信光検知器。 A light extraction means for extracting a part of communication light provided in a portion connecting the optical transmission paths and transmitted by the optical transmission path;
A light detection unit for detecting a part of the communication light extracted by the light extraction unit ;
In a communication light detector having
In the light detection unit,
A failure detection light emitting unit for emitting failure detection light to the light extraction means side;
A light receiving portion for receiving the failure detection light reflected on the light extraction means side;
Is provided with failure detecting means having,
The failure detection light emitting unit is
A light emission failure detection light source that emits the failure detection light to the light extraction means side;
An operating means for operating the failure detection light source;
Have
The light receiving unit is
The failure detection light from the failure detection light emitting unit,
A part of the communication light from the light extraction means;
Is a common light receiving member that receives both
The light extraction means includes
An optical fiber that is optically coupled to the optical transmission path is provided in a built-in assembly;
The failure detection light source is
It is provided to face the joined body,
In the joined body,
A notch is formed at a position facing the failure detection light source,
In addition, a communication light detector is provided, wherein a reflection member is provided to reflect the failure detection light to the light receiving member and prevent the failure detection light from entering the optical fiber . 前記故障検知光の波長帯域は、前記通信光の波長帯域と比較して狭帯域である請求項１に記載の通信光検知器。The communication light detector according to claim 1, wherein a wavelength band of the failure detection light is narrower than a wavelength band of the communication light. 前記故障検知用光源の発光中心波長は、前記共用受光部材の受光波長帯の中心波長よりも短波長である請求項１又は２に記載の通信光検知器。The communication light detector according to claim 1, wherein a light emission center wavelength of the failure detection light source is shorter than a center wavelength of a light reception wavelength band of the shared light receiving member. 前記光取出し手段は、前記光ファイバの長手方向中央で、前記共用受光部材と対向する位置において、前記接合体の外側表面から前記光ファイバまでを横断するように形成されて、前記通信光の一部を漏れ光として取り出すための光検知用溝である請求項１から３の何れかに記載の通信光検知器。The light extraction means is formed so as to cross from the outer surface of the joined body to the optical fiber at a position facing the shared light receiving member at the center in the longitudinal direction of the optical fiber. The communication light detector according to any one of claims 1 to 3, wherein the communication light detector is a light detection groove for extracting the portion as leakage light. 前記光検知用溝に、前記光ファイバのコアよりも屈折率が低く、かつ、前記光ファイバのクラッドよりも屈折率が低い屈折率を有する樹脂が充填されている請求項４に記載の通信光検知器。The communication light according to claim 4, wherein the optical detection groove is filled with a resin having a refractive index lower than that of the core of the optical fiber and lower than that of the cladding of the optical fiber. Detector. 前記接合体に、前記共用受光部材に臨む位置に前記共用受光部材を収容する収容溝が形成されており、前記収容溝の底面から前記光ファイバまでを横断するように前記光検知用溝が形成されている請求項４又は５に記載の通信光検知器。An accommodation groove for accommodating the shared light receiving member is formed in the joint body at a position facing the shared light receiving member, and the light detection groove is formed so as to cross from the bottom surface of the accommodation groove to the optical fiber. The communication light detector according to claim 4 or 5.
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