JP2009276627A - Communication light detector - Google Patents

Communication light detector Download PDF

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Publication number
JP2009276627A
JP2009276627A JP2008128799A JP2008128799A JP2009276627A JP 2009276627 A JP2009276627 A JP 2009276627A JP 2008128799 A JP2008128799 A JP 2008128799A JP 2008128799 A JP2008128799 A JP 2008128799A JP 2009276627 A JP2009276627 A JP 2009276627A
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light
optical
communication
communication light
detection
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JP2008128799A
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JP4927028B2 (en
Inventor
Masatsugu Kojima
正嗣 小島
Kanako Suzuki
香菜子 鈴木
Yoshihiro Nakatani
佳広 中谷
Toshihiko Ishikawa
俊彦 石川
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Hitachi Cable Ltd
NTT Communications Corp
Advanced Cable Systems Corp
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Hitachi Cable Ltd
NTT Communications Corp
Advanced Cable Systems Corp
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Priority to JP2008128799A priority Critical patent/JP4927028B2/en
Priority to CN200910137188.3A priority patent/CN101598838B/en
Priority to US12/465,735 priority patent/US8213791B2/en
Publication of JP2009276627A publication Critical patent/JP2009276627A/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
    • G02B6/4286—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
    • G02B6/381—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
    • G02B6/4287—Optical modules with tapping or launching means through the surface of the waveguide
    • G02B6/4291—Optical modules with tapping or launching means through the surface of the waveguide by accessing the evanescent field of the light guide

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Light Receiving Elements (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a communication light detector by which existence/nonexistence of using state of optical transmission lines is visibly and easily determined by using invisible light propagating in the optical transmission lines. <P>SOLUTION: The communication light detector 1, by which end parts of the optical transmission lines composed of optical fibers 2a and 2b are connected via a sleeve 6, and the existence/nonexistence of the communication light in the optical transmission lines is detected at the connection part, comprises: an optical detection connector 7 which is provided at the connection part in the sleeve 6, connects the end parts of the optical transmission lines, and has a core part 9 of which the outer diameter is different from that of the core 3 of the optical transmission lines; and an optical detection part which is provided above the optical detection connector 7 and detects the leaked light of the communication light leaked via the optical detection connector 7. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、光伝送路中に設置され、光伝送路の通信状況を確認する通信光検知器に関する。   The present invention relates to a communication light detector that is installed in an optical transmission line and confirms the communication status of the optical transmission line.

近年、通信の分野においては、高速・大容量伝送が可能な光ファイバが伝送線路の主流となり、さらなる発展が期待されている。これに伴い、特に、データセンタや局舎などの光通信関連設備では、光伝送路の変更や廃止、増設などの工事が頻繁に行われるようになってきた。   In recent years, in the field of communication, optical fibers capable of high-speed and large-capacity transmission have become mainstream transmission lines, and further development is expected. As a result, especially in optical communication related facilities such as data centers and office buildings, construction, such as changing, abolishing, or adding optical transmission paths, has been frequently performed.

このような光通信関連設備の光伝送路を伝送する通信光は、可視光領域にない不可視光であるため、目視にて確認することができない。そのため、光伝送路が使用されているか否かといった運用状態を容易に把握できず、その運用状態の把握に時間がかかったり、あるいは、使用されている光伝送路の光コネクタを使用されていないものと勘違いして抜いてしまうヒューマンエラーなどの懸念があり、光通信関連設備における未使用の光伝送路を有効に活用することができないといった問題があった。   Since the communication light transmitted through the optical transmission line of such an optical communication-related facility is invisible light not in the visible light region, it cannot be visually confirmed. For this reason, it is not possible to easily grasp the operational status such as whether or not the optical transmission line is used, and it takes time to grasp the operational state, or the optical connector of the used optical transmission line is not used. There are concerns such as human error that can be mistaken for a human error, and there is a problem that an unused optical transmission line in an optical communication-related facility cannot be used effectively.

そこで、光通信関連設備の保守性や運用効率を向上させるため、光伝送路を目視確認するための多くの手段が検討されている。   Therefore, in order to improve the maintainability and operational efficiency of the optical communication related equipment, many means for visually confirming the optical transmission path are being studied.

光ファイバを接続した状態で通信光の有無を確認する通信光検知器として、例えば、光ファイバが内蔵されて割スリーブ内で突き合わせ接続されるフェルールの端面同士間に、ギャップを設け、そのギャップに光透過性樹脂からなる導波体を設け、導波体の上方に導かれた通信光の一部を蛍光体で受光し、通信光の伝送の有無を検出している（例えば、特許文献１参照）。   As a communication light detector for confirming the presence or absence of communication light with an optical fiber connected, for example, a gap is provided between the end faces of ferrules in which the optical fiber is built and butt-connected in the split sleeve, A waveguide made of a light-transmitting resin is provided, and a part of communication light guided above the waveguide is received by a phosphor to detect the presence or absence of transmission of communication light (for example, Patent Document 1). reference).

また、光ファイバを内蔵した２つのフェルール間に光導波路基板を配置し、通信光の一部を光導波路基板にて分岐して通信光出力部へ取り出すことにより、通信光の有無を確認する方法が提案されている（例えば、特許文献２参照）。   Also, a method of confirming the presence or absence of communication light by disposing an optical waveguide substrate between two ferrules incorporating an optical fiber, branching out part of the communication light at the optical waveguide substrate, and taking it out to the communication light output unit Has been proposed (see, for example, Patent Document 2).

通信光の一部を分岐して取り出す分岐器を使用し、分岐光の端末部に可視光変換素子を取り付ける構造の通信光検知器の検討も行われている（例えば、特許文献３参照）。   A communication light detector having a structure in which a visible light conversion element is attached to a terminal portion of the branched light using a branching device that branches and extracts a part of the communication light has been studied (for example, see Patent Document 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

しかしながら、特許文献１の通信光検知器では、非常に狭いギャップ内に導波体を設けるため、その組み立てに時間と高度な位置合わせが必要である。しかも、光検知体が蛍光体からなるので、その発光時間が極端に短く目視確認しにくいため、光通信関連設備で使用するためには実用困難であった。   However, in the communication light detector of Patent Document 1, since a waveguide is provided in a very narrow gap, time and high-level alignment are necessary for the assembly. Moreover, since the light detector is made of a phosphor, its light emission time is extremely short and difficult to visually check, making it difficult to use in optical communication related equipment.

また、特許文献２では、光導波路基板とフェルールおよび通信光出力部とを接続する必要があることから、やはり、その組み立てに時間と高精度な位置合わせが必要となり、また、光導波路基板などの部材が高価であることから、さらなる実用化のために低コスト化の実現が困難であった。   Further, in Patent Document 2, since it is necessary to connect the optical waveguide substrate to the ferrule and the communication light output unit, the time and high-precision alignment are necessary for the assembly, and the optical waveguide substrate, etc. Since the member is expensive, it has been difficult to realize cost reduction for further practical use.

特許文献３でも、可視光変換素子の発光時間が極端に短く目視確認しにくい。   Even in Patent Document 3, the light emission time of the visible light conversion element is extremely short and difficult to visually confirm.

そこで、本発明の目的は、光伝送路を伝播する不可視光を用いて光伝送路の使用状態の有無を目視で容易に判別できる通信光検知器を提供することにある。   Accordingly, an object of the present invention is to provide a communication light detector that can easily visually determine whether or not an optical transmission line is in use by using invisible light propagating through the optical transmission line.

また、本発明の他の目的は、通信光検知器において、受光素子の位置に依存する検出感度の低下を改善することにある。   Another object of the present invention is to improve a decrease in detection sensitivity depending on the position of a light receiving element in a communication light detector.

前記目的を達成するために創案された本発明は、光ファイバからなる光伝送路の端部同士をスリーブを介して接続し、その接続部で前記光伝送路の通信光の有無を検知する通信光検知器において、前記スリーブ内の前記接続部に設けられ、前記光伝送路の端部同士と接合すると共に、前記光伝送路のコアと異なる外径のコア部を有する光検知接合体と、前記光検知接合体の上方に設けられ、前記光検知接合体を介して漏れる通信光の漏れ光を検知する光検知部とを備える通信光検知器である。   The present invention, which was created to achieve the above object, connects the end portions of an optical transmission line made of an optical fiber via a sleeve, and detects the presence or absence of communication light in the optical transmission line at the connection part. In the optical detector, provided at the connection portion in the sleeve, and is bonded to the ends of the optical transmission path, and has a core portion having an outer diameter different from the core of the optical transmission path, and It is a communication light detector provided with the light detection part which is provided above the said light detection coupling body, and detects the leakage light of the communication light which leaks through the said light detection coupling body.

前記光検知接合体は、その軸方向の長さが前記光伝送路のコアから、前記漏れ光を受光する前記光検知部の受光面までの距離と同等であるとよい。   The optical detection joined body may have an axial length equal to a distance from a core of the optical transmission path to a light receiving surface of the light detection unit that receives the leakage light.

前記光検知接合体は、前記コア部の周囲に設けられて前記光伝送路のクラッドと同じ外径のクラッド部をさらに備えるとよい。   The optical detection joined body may further include a clad portion that is provided around the core portion and has the same outer diameter as the clad of the optical transmission line.

前記光検知接合体は、フェルールを備えてもよい。   The light detection joined body may include a ferrule.

前記光検知部は、前記漏れ光を受光する受光素子と、前記受光素子にて受光した前記漏れ光を可視光に変換する光出力部とを備えるとよい。   The light detection unit may include a light receiving element that receives the leaked light and a light output unit that converts the leaked light received by the light receiving element into visible light.

前記光検知部は、その故障の有無を知らせる故障検知部をさらに備えるとよい。   The light detection unit may further include a failure detection unit that notifies the presence or absence of the failure.

前記スリーブは、前記光検知接合体を介して漏れる通信光の漏れ光の一部を透過するセラミックスからなるとよい。   The sleeve may be made of ceramics that transmits a part of leaked light of communication light leaking through the light detection joined body.

本発明によれば、光伝送路を伝播する不可視光を用いて光伝送路の使用状態の有無を発光時間に依存することなく目視で容易に判別することができ、光伝送路の保守性や運用効率を向上させることができる。   According to the present invention, it is possible to easily determine visually whether or not the optical transmission path is used by using invisible light propagating through the optical transmission path without depending on the light emission time, and maintainability of the optical transmission path or Operational efficiency can be improved.

以下、本発明の好適な実施形態を添付図面にしたがって説明する。   Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

まず、通信光検知器の全体構成を、図１（ａ）および図１（ｂ）を用いて説明する。   First, the overall configuration of the communication light detector will be described with reference to FIGS. 1 (a) and 1 (b).

図１（ａ）および図１（ｂ）に示すように、通信光検知器１は、その主要部が収容される角形筒状のハウジング１６と、そのハウジング１６上の中央部に設けられ、光検知部１２を覆う箱状のカバー１７とを備えた光アダプタ型の通信光検知器である。   As shown in FIGS. 1 (a) and 1 (b), the communication light detector 1 is provided in a rectangular cylindrical housing 16 in which the main part is accommodated, and a central part on the housing 16, It is an optical adapter type communication light detector provided with a box-shaped cover 17 that covers the detector 12.

ハウジング１６は、一端部（図２では左側）が設備側の光コネクタアダプタ１８ｃとなり、他端部（図１では右側）がユーザ側の光コネクタアダプタ１８ｙとなる。設備側の光コネクタアダプタ１８ｃ内には、設備側の光コネクタプラグを予め挿入して固定するためのコネクタロック片１９ｃが設けられる。同様に、ユーザ側の光コネクタアダプタ１８ｙ内には、挿抜自在に設けられるユーザ側の光コネクタプラグを固定するためのコネクタロック片１９ｙが設けられる。   One end (left side in FIG. 2) of the housing 16 is a facility-side optical connector adapter 18c, and the other end (right side in FIG. 1) is a user-side optical connector adapter 18y. In the optical connector adapter 18c on the equipment side, a connector lock piece 19c for inserting and fixing the optical connector plug on the equipment side in advance is provided. Similarly, in the optical connector adapter 18y on the user side, a connector lock piece 19y for fixing the optical connector plug on the user side that is detachably provided is provided.

設備側の光コネクタアダプタ１８ｃ内のコネクタロック片１９ｃより奥側には、設備側のスリーブホルダ２０ｃを収容するスリーブホルダ収容室２１ｃが形成され、そのスリーブホルダ収容室２１ｃに設備側のスリーブホルダ２０ｃが予め収容される。同様に、ユーザ側の光コネクタアダプタ１８ｙ内のコネクタロック片１９ｙより奥側には、ユーザ側のスリーブホルダ２０ｙを収容するスリーブホルダ収容室２１ｙが形成され、そのスリーブホルダ収容室２１ｙにユーザ側のスリーブホルダ２０ｙが予め収容される。   A sleeve holder accommodating chamber 21c for accommodating the equipment side sleeve holder 20c is formed behind the connector lock piece 19c in the equipment side optical connector adapter 18c, and the equipment side sleeve holder 20c is accommodated in the sleeve holder accommodating chamber 21c. Is accommodated in advance. Similarly, a sleeve holder accommodating chamber 21y for accommodating a user side sleeve holder 20y is formed on the inner side of the connector lock piece 19y in the optical connector adapter 18y on the user side. The sleeve holder 20y is accommodated in advance.

ハウジング１６内の中央部には、１つのスリーブ６と、光検知接合体７とからなる検知器本体１ｂを収容する本体収容室２２が形成され、その本体収容室２２に、検知器本体１ｂが予め収容される。ハウジング１６内の本体収容室２２の上部には、ＰＤ１４を収容するＰＤ収容室１９が形成される。   In the central portion of the housing 16, a main body housing chamber 22 for housing a detector main body 1 b composed of one sleeve 6 and a light detection joined body 7 is formed. In the main body housing chamber 22, the detector main body 1 b is provided. Pre-contained. A PD accommodating chamber 19 for accommodating the PD 14 is formed in the upper portion of the main body accommodating chamber 22 in the housing 16.

ハウジング１６の両側面には、光通信関連設備に設置される光モジュールに通信光検知器１を予め収容して固定するための係合部２４が形成される。ハウジング１６上の中央部の四隅には、ハウジング１６の上面から起立し、ハウジング１６上にカバー１７を固定するためのカバーロック片２５がそれぞれ設けられる。   Engaging portions 24 are formed on both side surfaces of the housing 16 for previously accommodating and fixing the communication light detector 1 in an optical module installed in the optical communication-related facility. Cover lock pieces 25 that stand from the upper surface of the housing 16 and fix the cover 17 on the housing 16 are respectively provided at the four corners of the central portion on the housing 16.

カバー１７の両側面には、各カバーロック片２５とそれぞれ嵌合するカバーロック穴２６が形成される。カバー１７内には、回路基板２７が収容される。カバー１７は、後述する通信有無判別用ＬＥＤと回路故障検知用ＬＥＤとが出射する光に対してほぼ透明な材料で作製される。   On both side surfaces of the cover 17, cover lock holes 26 are formed for fitting with the respective cover lock pieces 25. A circuit board 27 is accommodated in the cover 17. The cover 17 is made of a material that is substantially transparent to light emitted from a communication presence / absence determination LED and a circuit failure detection LED, which will be described later.

一方、光検知部１２は、ＰＤ素子１３（後述する図２（ａ）参照）と、そのＰＤ素子１３にて受光した漏れ光Ｅ（後述する図２（ｃ）参照）を可視光に変換する光出力部２８と、回路基板２７の故障の有無を知らせる故障検知部２９と、これらＰＤ素子１３、光出力部２８、故障検知部２９が搭載されて光検知回路を構成する回路基板２７とを備える。   On the other hand, the light detection unit 12 converts the PD element 13 (see FIG. 2A described later) and the leakage light E (see FIG. 2C described later) received by the PD element 13 into visible light. A light output unit 28, a failure detection unit 29 that informs whether or not the circuit board 27 has failed, and a circuit board 27 that includes the PD element 13, the light output unit 28, and the failure detection unit 29 and constitutes a light detection circuit. Prepare.

また、本実施形態では、通信有無判別用ＬＥＤとして赤色光を出射するものを使用し、回路故障検知用ＬＥＤとして青色光を出射するものを使用した。これにより、出射する光の色を目視して通信有無判別と回路故障検知の区別を簡単にでき、通信光検知器１をより信頼性の高いものにできる。   Further, in the present embodiment, an LED that emits red light is used as the communication presence / absence determination LED, and an LED that emits blue light is used as the circuit failure detection LED. This makes it easy to distinguish between the presence / absence of communication and the detection of circuit failure by visually observing the color of the emitted light, and the communication light detector 1 can be made more reliable.

本実施形態では、光出力部２８として、通信光が光ファイバ２ａ，２ｂ間を伝播しているとき点灯し、伝播していないとき消灯する通信有無判別用ＬＥＤ（発光ダイオード）を用いた。故障検知部２９としては、回路基板２７が故障しているあるいは動作していないとき（例えば、給電されていないとき）点灯し、故障していないとき消灯する回路故障検知用ＬＥＤを用いた。   In the present embodiment, a communication presence / absence determination LED (light emitting diode) that is turned on when communication light propagates between the optical fibers 2a and 2b and turned off when not propagated is used as the light output unit 28. As the failure detection unit 29, a circuit failure detection LED that is turned on when the circuit board 27 is broken or not operating (for example, when power is not supplied) and turned off when there is no failure is used.

例えば、回路故障検知用ＬＥＤのみで青色に光る場合（青だけ光るとき）は、通信光検知器１は動作しておらず、かつ通信していないことを示し、通信有無判別用ＬＥＤが赤色に光る場合（赤だけ光るとき）には、通信光検知器１が動作しており、かつ通信していることを示す。つまり、色違いのＬＥＤを用いて通信光検知器１の故障・通信の有無をより簡単に区別できるようにした。   For example, when only the circuit failure detection LED shines blue (when only blue shines), it indicates that the communication light detector 1 is not operating and is not communicating, and the communication presence / absence determination LED is red. When it shines (when only red light shines), it indicates that the communication light detector 1 is operating and communicating. That is, it is possible to more easily distinguish between the failure of the communication light detector 1 and the presence or absence of communication using LEDs of different colors.

さて、図２（ａ）は、本発明の好適な第１の実施形態を示す通信光検知器の主要部の縦断面図である。   FIG. 2A is a longitudinal sectional view of the main part of the communication light detector showing the preferred first embodiment of the present invention.

図２（ａ）に示すように、第１の実施形態に係る通信光検知器１は、例えば、データセンタや局舎などの光通信関連設備に設置されて使用され、光伝送路としての光ファイバの端部同士を突き合わせ接続した光ファイバの接続部において、光伝送路の使用状態を監視して通信光の有無（光通信しているか否か）を検知するものである。   As shown in FIG. 2A, the communication light detector 1 according to the first embodiment is installed and used in, for example, an optical communication-related facility such as a data center or a station building, and is used as an optical transmission path. In the optical fiber connection part in which the fiber ends are connected to each other, the use state of the optical transmission line is monitored to detect the presence or absence of communication light (whether optical communication is being performed).

この通信光検知器１は、光伝送路としての光ファイバ２ａ，２ｂがそれぞれ内蔵されたフェルール５ａ，５ｂの端部が挿入され、フェルール５ａ，５ｂの光軸位置合わせをするためのスリーブ６と、そのスリーブ６内に設けられ、光ファイバ２ａ，２ｂの端部（光ファイバの接続部側の端部）同士と接合すると共に、光ファイバ２ａ，２ｂのコア３と異なる外径の（コア径が異なる）コア部９を有する光検知接合体７とからなる検知器本体１ｂを備える。   The communication light detector 1 includes an end of ferrules 5a and 5b each containing optical fibers 2a and 2b as optical transmission paths, and a sleeve 6 for aligning the optical axes of the ferrules 5a and 5b. The optical fiber 2a, 2b is provided in the sleeve 6 and joined to the ends of the optical fibers 2a, 2b (ends on the optical fiber connecting portion side) and has an outer diameter (core diameter different from the core 3 of the optical fibers 2a, 2b). The detector main body 1b which consists of the optical detection joining body 7 which has the core part 9 is provided.

通信光検知器１に挿入される光伝送路としての各光ファイバ２ａ，２ｂは、コア３とクラッド４からなる。これら光ファイバ２ａ，２ｂには、一般的に石英ガラス製のシングルモード光ファイバや、ＧＩ（グレーデッドインデックス）型のマルチモード光ファイバが用いられる。各光ファイバ２ａ，２ｂとしてシングルモード光ファイバを用いる場合は、波長が１３１０ｎｍ帯、あるいは１５５０ｎｍ帯の通信光が使用される。各光ファイバとしてマルチモード光ファイバが用いられる場合には、波長が８５０ｎｍ帯、あるいは１３１０ｎｍ帯の通信光が使用される。   Each optical fiber 2 a, 2 b as an optical transmission line inserted into the communication light detector 1 includes a core 3 and a clad 4. As these optical fibers 2a and 2b, a single mode optical fiber made of quartz glass or a GI (graded index) type multimode optical fiber is generally used. When single mode optical fibers are used as the optical fibers 2a and 2b, communication light having a wavelength of 1310 nm band or 1550 nm band is used. When a multimode optical fiber is used as each optical fiber, communication light having a wavelength of 850 nm band or 1310 nm band is used.

フェルール５ａは、設備側の光コネクタプラグ３３ｃ（後述する図３（ａ）参照）に内蔵され、フェルール５ｂは、ユーザ側の光コネクタプラグ３３ｙ（後述する図３（ａ）参照）に内蔵される。これらフェルール５ａ，５ｂは、セラミックスあるいは金属で作製され、その端面（光ファイバの接続部側の端面）がＰＣ（物理的接触）端面となるように研磨される。   The ferrule 5a is built in the optical connector plug 33c on the facility side (see FIG. 3A described later), and the ferrule 5b is built in the optical connector plug 33y on the user side (see FIG. 3A described later). . These ferrules 5a and 5b are made of ceramics or metal, and are polished so that their end faces (end faces on the optical fiber connecting portion side) become PC (physical contact) end faces.

スリーブ６は、通信光の少なくとも一部を透過する（あるいは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もの、あるいはスリーブ長手方向（軸方向）に延びるスリットを有するセラミックス製、ガラス製、金属製の割スリーブを用いる。通信光の少なくとも一部を透過するセラミックスとしては、例えば、ジルコニアセラミックスがある。   The sleeve 6 is made of ceramic or glass that transmits at least a part of communication light (or scatters when receiving communication light), or made of ceramic or glass having a slit extending in the sleeve longitudinal direction (axial direction). Use a metal or metal split sleeve. Examples of the ceramic that transmits at least a part of the communication light include zirconia ceramics.

光検知接合体７は、光ファイバ２ａ，２ｂのコア３の端部中心同士と接合されるコア部９と、そのコア部９の周囲に設けられ、光ファイバ２ａ，２ｂのクラッド４と同じ外径のクラッド部１０と、そのクラッド部１０の周囲に設けられるフェルール部１１とからなる。この光検知接合体７のうち、コア部９とクラッド部１０からなる部分が検知側の光伝送路８となる。   The optical detection joined body 7 is provided around the core portion 9 which is joined to the center of the end portion of the core 3 of the optical fibers 2a and 2b, and around the core portion 9, and is the same as the cladding 4 of the optical fibers 2a and 2b. It consists of a clad part 10 having a diameter and a ferrule part 11 provided around the clad part 10. In the light detection joined body 7, a portion including the core portion 9 and the clad portion 10 serves as a light transmission path 8 on the detection side.

光検知接合体７は、コア部５が各光ファイバ２ａ，２ｂのコア３と同じ材料で作製され、クラッド部１０が各光ファイバ２ａ，２ｂのクラッド４と同じ材料で作製される。光検知接合体７の光ファイバ長手方向の両端面は、各光ファイバ２ａ，２ｂの端面（光ファイバの接続部側の端面）とＰＣ接続されるため、ＰＣ端面となるように研磨される。光検知接合体７の外径（フェルール部１１の外径）は、各フェルール５ａ，５ｂの外径Φｆと同じか、又はそれよりも小さい。   In the optical detection joined body 7, the core part 5 is made of the same material as the core 3 of each optical fiber 2a, 2b, and the clad part 10 is made of the same material as the clad 4 of each optical fiber 2a, 2b. Since both end faces of the optical detection joined body 7 in the longitudinal direction of the optical fiber are PC-connected to end faces of the optical fibers 2a and 2b (end faces on the optical fiber connecting portion side), they are polished so as to become PC end faces. The outer diameter of the optical detection joined body 7 (the outer diameter of the ferrule portion 11) is the same as or smaller than the outer diameter Φf of each of the ferrules 5a and 5b.

光検知接合体７と光ファイバ２ａの接合部は、光入射方向が白抜き矢印の場合、図２（ｃ）に示すように、コア径の違いによる損失発生箇所ともなる。光入射方向が黒塗り矢印の場合も同様である。このため、通信光Ｃが光検知接合体７と光ファイバ２ａの接合部Ｊを通過し、その一部が漏れ光Ｅとして漏れたときの伝送損失が、光通信に悪影響を与えない範囲である１〜２ｄＢとなるように、光検知接合体７のコア部９のコア径を設定する。光検知接合体７のコア部９は、コア径が約２〜３μｍまでのものが作製可能である。   When the light incident direction is a white arrow, the joint between the light detection joined body 7 and the optical fiber 2a becomes a loss occurrence place due to a difference in core diameter, as shown in FIG. The same applies when the light incident direction is a black arrow. For this reason, the transmission loss when the communication light C passes through the joint J between the optical detection joined body 7 and the optical fiber 2a and a part thereof leaks as the leaked light E is in a range that does not adversely affect the optical communication. The core diameter of the core portion 9 of the light detection joined body 7 is set so as to be 1 to 2 dB. The core portion 9 of the light detection joined body 7 can be manufactured with a core diameter of about 2 to 3 μm.

本実施形態では、光検知接合体７のコア部９のコア径が、光ファイバ２ａ，２ｂのコア３のコア径よりも小さい例で説明するが、逆に、光検知接合体のコア部のコア径が、光ファイバ２ａ，２ｂのコア３のコア径よりも大きい場合でも、図２（ｃ）と同様の作用となる。この場合にも、光検知接合体７のクラッド部の外径と光ファイバ２ａ，２ｂのクラッド４の外径は同じとなる。   In the present embodiment, an example in which the core diameter of the core portion 9 of the light detection bonded body 7 is smaller than the core diameter of the core 3 of the optical fibers 2a and 2b will be described. Even when the core diameter is larger than the core diameter of the core 3 of the optical fibers 2a and 2b, the same action as in FIG. Also in this case, the outer diameter of the clad part of the optical detection joined body 7 and the outer diameter of the clad 4 of the optical fibers 2a and 2b are the same.

図２（ａ）に戻り、通信光検知器１は、光検知接合体７の上方に設けられてその光検知接合体７を介して漏れる漏れ光Ｅを検知する光検知部１２を備える。詳細には、光検知接合体７とスリーブ６に関して対称な位置に、漏れ光Ｅを受光する受光面が光伝送路と平行となるように光検知部１２は配置されている。図２（ａ）では、光検知部１２の一部を構成し、漏れ光Ｅを受光する受光素子としてのＰＤ素子１３を備えたＰＤ１４のみを描いた。本実施形態では、ＰＤ１４として安価なＣａｎパッケージタイプのものを用いた。   Returning to FIG. 2A, the communication light detector 1 includes a light detection unit 12 that is provided above the light detection bonded body 7 and detects leakage light E that leaks through the light detection bonded body 7. Specifically, the light detection unit 12 is arranged at a symmetrical position with respect to the light detection bonded body 7 and the sleeve 6 so that the light receiving surface that receives the leakage light E is parallel to the light transmission path. In FIG. 2A, only the PD 14 that constitutes a part of the light detection unit 12 and includes the PD element 13 as a light receiving element that receives the leakage light E is illustrated. In this embodiment, an inexpensive can package type PD 14 is used.

光検知接合体７は、その軸方向の長さＬが、各光ファイバ２ａ，２ｂのコア３からＰＤ素子１３の受光面までの距離Ｑと同等であるとよい。この場合、漏れ光Ｅの約５０％がＰＤ１４に入射するため、漏れ光の検出感度が最大となる。   The optical detection joined body 7 may have an axial length L equal to the distance Q from the core 3 of each of the optical fibers 2 a and 2 b to the light receiving surface of the PD element 13. In this case, since about 50% of the leaked light E is incident on the PD 14, the detection sensitivity of the leaked light is maximized.

すなわち、直径Φｆの各フェルール５ａ，５ｂでは、ＰＤ１４の光入射口１５からＰＤ素子１３の受光面までの距離がＬｒ、フェルール半径がΦｆ／２なので、スリーブ６の厚さをｄとすると、損失発生箇所からＰＤ素子１３の受光面までの距離Ｑは、Ｑ＝Ｌｒ＋（Φｆ／２）＋ｄとなる。そして、このとき長さＬが距離Ｑと同等（一般的なフェルールではΦｆ＝２．５ｍｍなので、長さＬと距離Ｑがほぼ２．３５ｍｍ＋ｄ）であれば、漏れ光Ｅの検出感度が最適となる。   That is, in each of the ferrules 5a and 5b having the diameter Φf, since the distance from the light incident port 15 of the PD 14 to the light receiving surface of the PD element 13 is Lr and the ferrule radius is Φf / 2, if the thickness of the sleeve 6 is d, the loss The distance Q from the generation point to the light receiving surface of the PD element 13 is Q = Lr + (Φf / 2) + d. At this time, if the length L is equal to the distance Q (the length L and the distance Q are approximately 2.35 mm + d because Φf = 2.5 mm in a general ferrule), the detection sensitivity of the leaked light E is optimal. Become.

次に、図３（ａ）および図３（ｂ）を用いて、通信光検知器１を用いた光モジュールの一例を説明する。   Next, an example of an optical module using the communication light detector 1 will be described with reference to FIGS. 3 (a) and 3 (b).

図３（ａ）および図３（ｂ）に示すように、光モジュール（光プレ配線モジュール）３１は、ケース３２内に通信光検知器１を複数個（図３（ａ）では、４個）収容して主に構成される。光モジュール３１としては、例えば、光通信関連設備内に設置される光集約器や光成端箱の他、架空光クロージャなどが挙げられる。   As shown in FIGS. 3A and 3B, the optical module (optical pre-wiring module) 31 includes a plurality of communication light detectors 1 in the case 32 (four in FIG. 3A). Contained mainly composed. Examples of the optical module 31 include a light aggregator and an optical termination box installed in an optical communication-related facility, and an aerial light closure.

ケース３２は、箱状の下ケース（ファイバ収納用トレイ）３２ｄと、その下ケース３２ｄに開閉自在に設けられるフタ３２ｕとからなる。本実施形態では、フタ３２ｕとして、前述した通信有無判別用ＬＥＤと回路故障検知用ＬＥＤが出射する光に対してほぼ透明な材料で作製したものを用いた。   The case 32 includes a box-shaped lower case (fiber storage tray) 32d and a lid 32u provided on the lower case 32d so as to be freely opened and closed. In this embodiment, the lid 32u is made of a material that is substantially transparent to the light emitted from the communication presence / absence determination LED and the circuit failure detection LED.

下ケース３２ｄの端部には、各通信光検知器１のユーザ側の光コネクタアダプタ１８ｙが、下ケース３２ｄの長手方向に突出するように収容されて固定される。各ユーザ側の光コネクタアダプタ１８ｙには、光ファイバ２ｂとフェルール５ｂ（図２（ａ）参照）が内蔵されたユーザ側の光コネクタプラグ３３ｙがそれぞれ挿抜自在に設けられる。本実施形態では、ユーザ側の光コネクタアダプタ１８ｙとユーザ側の光コネクタプラグ３３ｙとで構成される光コネクタの一例としてＳＣ光コネクタを用いた。   At the end of the lower case 32d, the optical connector adapter 18y on the user side of each communication light detector 1 is accommodated and fixed so as to protrude in the longitudinal direction of the lower case 32d. Each user-side optical connector adapter 18y is provided with a user-side optical connector plug 33y, in which the optical fiber 2b and the ferrule 5b (see FIG. 2A) are built, so that they can be inserted and removed. In the present embodiment, an SC optical connector is used as an example of an optical connector composed of the user-side optical connector adapter 18y and the user-side optical connector plug 33y.

各通信光検知器１の設備側の光コネクタプラグ１８ｃには、光ファイバ２ａとフェルール５ａ（図２（ａ）参照）が内蔵された設備側の光コネクタプラグ３３ｃが、予めそれぞれ挿入されて固定される。   In the optical connector plug 18c on the equipment side of each communication light detector 1, an optical connector plug 33c on the equipment side containing the optical fiber 2a and the ferrule 5a (see FIG. 2A) is inserted and fixed in advance. Is done.

光伝送路を使用する場合には、使用したい光伝送路にあたるユーザ側の光コネクタアダプタ１８ｙに、ユーザ側の光コネクタプラグ３３ｙを挿入して固定することで、ユーザ側の光伝送路としての光ファイバと、設備側の光伝送路としての光ファイバ２ａとを光結合させる。   When using an optical transmission line, a user-side optical connector plug 33y is inserted into and fixed to the user-side optical connector adapter 18y corresponding to the optical transmission line to be used. The fiber and the optical fiber 2a as an optical transmission line on the facility side are optically coupled.

下ケース３２ｄ内には、設備側の光コネクタプラグ１８ｃから延びる光ファイバ２ａの余長を収納するためのファイバ余長収納部３４が設けられる。各光ファイバ２ａは、ファイバ余長収納部３４を介して複数本束ねられ、光ファイバケーブルとして光モジュール３１の外部と接続される。   In the lower case 32d, there is provided a fiber surplus length storage portion 34 for storing the surplus length of the optical fiber 2a extending from the equipment-side optical connector plug 18c. A plurality of optical fibers 2a are bundled via a fiber extra-length storage section 34 and connected to the outside of the optical module 31 as an optical fiber cable.

下ケース３２ｄ内には、各通信光検知器１とファイバ余長収納部３４間に、光検知部１２に電力を供給する電力供給部３５が設けられる。この電力供給部３５と各通信光検知器１の回路基板２７とは、それぞれ給電ケーブル３６で接続される。電力供給部３５としては、バッテリやソーラーパネルを用いる。   In the lower case 32d, a power supply unit 35 that supplies power to the light detection unit 12 is provided between each communication light detector 1 and the extra fiber length storage unit 34. The power supply unit 35 and the circuit board 27 of each communication light detector 1 are connected by a power feeding cable 36, respectively. As the power supply unit 35, a battery or a solar panel is used.

第１の実施形態の作用を説明する。   The operation of the first embodiment will be described.

使用したい光伝送路にあたるユーザ側の光コネクタアダプタ１４ｙに、ユーザ側の光コネクタプラグ３３ｙを挿入して固定し、設備側からユーザ側に向かって通信しているものとする。   It is assumed that the user-side optical connector plug 33y is inserted and fixed to the user-side optical connector adapter 14y corresponding to the optical transmission path to be used, and communication is performed from the equipment side toward the user side.

この場合、図２（ａ）および図２（ｃ）に示すように、通信光Ｃは、設備側の光コネクタに内蔵されたフェルール５ａ内の光ファイバ２ａを通り、光ファイバ２ａと光検知接合体７の接合部Ｊに達する。   In this case, as shown in FIGS. 2 (a) and 2 (c), the communication light C passes through the optical fiber 2a in the ferrule 5a built in the optical connector on the equipment side, and the optical fiber 2a and the optical detection junction. The joint J of the body 7 is reached.

通信光Ｃが接合部Ｊを通過すると、光ファイバ２ａのコアのコア径よりも光検知接合体７のコア部９のコア径が小さいか、又は大きいため、通信光Ｃの一部が漏れ光Ｅとして漏れ、その漏れ光Ｅが光ファイバ２ａのコア端面から広がる。   When the communication light C passes through the joint portion J, the core diameter of the core portion 9 of the optical detection joined body 7 is smaller or larger than the core diameter of the core of the optical fiber 2a. The leakage light E spreads from the core end surface of the optical fiber 2a.

この広がった漏れ光Ｅは、スリーブ６のスリットを通り、あるいはその一部がスリーブ６を透過し、光検知部１２のＰＤ素子１３で受光されて電気信号に変換され、その電気信号が回路基板２７を伝送して光検知部１２の光出力部２８で可視光に変換されて出射される。ユーザ側から設備側に向かって通信する場合も同様である。   The spread leaked light E passes through the slit of the sleeve 6 or a part thereof passes through the sleeve 6 and is received by the PD element 13 of the light detection unit 12 to be converted into an electric signal. 27 is converted into visible light by the light output unit 28 of the light detection unit 12 and emitted. The same applies to communication from the user side toward the equipment side.

この可視光の有無を作業者が目視することで、例えば、図３（ａ）の光モジュール３１において、どの光伝送路が使用されているか否かを簡単に確認できる。   By visually checking the presence or absence of visible light, for example, it is possible to easily confirm which optical transmission line is used in the optical module 31 of FIG.

このように通信光検知器１は、スリーブ６内に、光伝送路としての光ファイバ２ａ，２ｂのコア３と異なるコア径のコア部９を有する光検知接合体７を備えているため、コア部５のコア径のみを設定すれば、通信光Ｃから所望量の漏れ光Ｅを簡単に取り出せる。   As described above, the communication light detector 1 includes the light detection joined body 7 having the core portion 9 having a core diameter different from that of the core 3 of the optical fibers 2a and 2b as the optical transmission path in the sleeve 6. If only the core diameter of the part 5 is set, a desired amount of leakage light E can be easily extracted from the communication light C.

しかも、光検知接合体７は、光ファイバのコアやクラッドとほぼ同様の構成、材料であり、光伝送路としての光ファイバ２ａ，２ｂが内蔵されたフェルール５ａ，５ｂの外径と同じか、それよりも小さい外径を有することから、低コストで簡単に作製でき、光ファイバ２ａ，２ｂやフェルール５ａ，５ｂとの接続も簡単である。   In addition, the optical detection joined body 7 has substantially the same configuration and material as the core and clad of the optical fiber, and is the same as the outer diameter of the ferrules 5a and 5b in which the optical fibers 2a and 2b are incorporated as optical transmission paths, Since it has an outer diameter smaller than that, it can be easily manufactured at low cost, and the connection with the optical fibers 2a and 2b and the ferrules 5a and 5b is also simple.

したがって、通信光検知器１によれば、光伝送路を伝播する不可視光を用いて光伝送路の使用状態の有無を発光時間に依存することなく目視で容易に判別することができ、通信伝送路の保守性や運用効率を向上させることができる。   Therefore, according to the communication light detector 1, it is possible to easily determine visually whether or not the optical transmission path is in use without depending on the light emission time by using invisible light propagating through the optical transmission path. Road maintainability and operational efficiency can be improved.

また、通信光検知器１は、光検知接合体７の上方に光検知部８を設けているので、光コネクタに受光素子を内蔵する場合に比べて低コストであり、検知器自体の構成も簡単にできる。   Further, since the communication light detector 1 is provided with the light detection unit 8 above the light detection bonded body 7, it is less expensive than the case where the light receiving element is built in the optical connector, and the configuration of the detector itself is also provided. Easy to do.

ここで、本発明者らは、通信光検知器において、受光素子（例えば、ＰＤ）の位置に依存する検出感度の低下の改善を図る本発明のもう１つの目的が達成されているかどうかを確認するため、通信光検知器１の比較例として図４（ａ）に示す通信光検知器４１を作製し、その漏れ光検知感度を調べた。   Here, the present inventors confirm whether or not the other object of the present invention for improving the decrease in detection sensitivity depending on the position of the light receiving element (for example, PD) is achieved in the communication light detector. Therefore, a communication light detector 41 shown in FIG. 4A was produced as a comparative example of the communication light detector 1, and the leakage light detection sensitivity was examined.

比較例の通信光検知４１は、光伝送路における各光コネクタ内のフェルール５ａ，５ｂ間にギャップｇ４が設けられるように屈折率整合剤ｍを充填し、ギャップｇ４により発生する通信光の漏れ光をＰＤ１４のＰＤ素子１３で検出することで、通信光の有無を検知するものである。   The communication light detection 41 of the comparative example is filled with the refractive index matching agent m so that the gap g4 is provided between the ferrules 5a and 5b in each optical connector in the optical transmission line, and the leakage light of the communication light generated by the gap g4 Is detected by the PD element 13 of the PD 14 to detect the presence or absence of communication light.

ただし、通信光検知器１，４１において、スリーブ６の長さＬ６を１１．４ｍｍとし、フェルール５ａ，５ｂの外径Φｆを２．５ｍｍとし、ＰＤ１４の光入射口１５からＰＤ素子１３の受光面までの距離Ｌｒを１．１ｍｍとした。漏れ光検知感度の基準点は光入射口１５（図２（ａ）、図４（ａ）中の●）とした。   However, in the communication light detectors 1 and 41, the length L6 of the sleeve 6 is 11.4 mm, the outer diameter Φf of the ferrules 5a and 5b is 2.5 mm, and the light receiving surface of the PD element 13 from the light incident port 15 of the PD14. The distance Lr was 1.1 mm. The reference point for the leakage light detection sensitivity was the light entrance 15 (● in FIG. 2A and FIG. 4A).

図４（ｂ）〜図４（ｄ）に示すように、通信光検知器４１では、Ｘ軸、Ｚ軸方向に関しては、光入射方向にて漏れ光検知感度は変わらないものの、Ｙ軸方向（光ファイバ長手方向）に関しては、光入射方向に依存して最大検知感度の位置が大きく変化してしまう。   As shown in FIGS. 4B to 4D, in the communication light detector 41, the leakage light detection sensitivity does not change in the light incident direction in the X axis direction and the Z axis direction, but the Y axis direction ( With respect to the longitudinal direction of the optical fiber, the position of the maximum detection sensitivity changes greatly depending on the light incident direction.

これに対し、通信光検知器１は、光検知接合体７により、フェルール５ａ，５ｂ間に光の入射方向に依存して損失発生箇所が異なる（漏れ光Ｅが発生する場所が２箇所ある）構造を有するものである。   On the other hand, the communication light detector 1 differs in the loss occurrence location depending on the light incident direction between the ferrules 5a and 5b depending on the light detection joined body 7 (there are two places where leakage light E is generated). It has a structure.

このため、通信光検知器１のＹ軸方向の漏れ検知感度は、図２（ｂ）に示すように、最大検知感度の位置が光入射方向に依存しなくなり、通信光検知器４１と比べると、漏れ光検知感度を１．３倍程度向上させることができる。   For this reason, the leak detection sensitivity in the Y-axis direction of the communication light detector 1 is not dependent on the light incident direction as shown in FIG. The leakage light detection sensitivity can be improved by about 1.3 times.

また、図１の通信光検知器１によれば、光伝送路のコアと異なる外径を有するコア部９を備えた光検知接合体７を設けたことのみで、従来の通信光検知器のような光導波路基板などが不要であり、高精度な位置合わせが不要である。   Moreover, according to the communication light detector 1 of FIG. 1, only by providing the light detection joined body 7 provided with the core part 9 which has an outer diameter different from the core of an optical transmission line, the conventional communication light detector of FIG. Such an optical waveguide substrate or the like is unnecessary, and high-precision alignment is unnecessary.

さらに光検知接合体７は、従来のフェルールと同様の役目を果たすので、従来の通信光検知器と比べて部品点数を減らすこともできる。   Furthermore, since the optical detection joined body 7 plays the same role as the conventional ferrule, the number of parts can be reduced as compared with the conventional communication light detector.

また、図５に示す第２の実施形態に係る通信光検知器５１のように、図１の通信光検知器１の構成に加え、ＰＤ素子１３あるいは光出力部２８の故障の有無を知らせるための光素子用の故障検知部５２を備えてもよい。光素子用の故障検知部５２としては、スイッチによりＯＮ／ＯＦＦする光素子故障検知用ＬＥＤを用いるとよい。   In addition to the configuration of the communication light detector 1 in FIG. 1, like the communication light detector 51 according to the second embodiment shown in FIG. 5, in order to notify the presence or absence of a failure of the PD element 13 or the light output unit 28. A failure detector 52 for the optical element may be provided. As the optical element failure detection unit 52, an optical element failure detection LED that is turned ON / OFF by a switch may be used.

この場合、ハウジング１６のＰＤ収容室２３の片側に、ＰＤ１４の側面と、回路基板２７の裏面と、スリーブ６とで区画形成される空間Ｓ５を形成し、その空間Ｓ５の上方に位置する回路基板２７の裏面に光素子用の故障検知部５２を搭載する。   In this case, a space S5 defined by the side surface of the PD 14, the back surface of the circuit board 27, and the sleeve 6 is formed on one side of the PD accommodating chamber 23 of the housing 16, and the circuit board positioned above the space S5. 27 is mounted on the back surface of the optical element.

通信光検知器５１では、作業者がスイッチをＯＮすると、光素子用の故障検知部５２からスリーブ６に向けて故障検知用光が出射し、その故障検知用光がスリーブ６で反射（あるいは散乱）されることでＰＤ素子１３に入射される。   In the communication light detector 51, when the operator turns on the switch, the failure detection light is emitted from the failure detection unit 52 for the optical element toward the sleeve 6, and the failure detection light is reflected (or scattered) by the sleeve 6. ) Is incident on the PD element 13.

ＰＤ素子１３や光出力部２８が故障していない場合、作業者が光出力部２８から出射する可視光を目視することで、光素子が故障していないことがわかる。また、ＰＤ素子１３や光出力部２８が故障している場合には、作業者がスイッチをＯＮしても光出力部２８から可視光が出射されないため、光素子が故障していることがわかる。   When the PD element 13 and the light output unit 28 are not broken down, it can be seen that the optical element is not broken by an operator viewing the visible light emitted from the light output unit 28. Further, when the PD element 13 and the light output unit 28 are out of order, no visible light is emitted from the light output unit 28 even when the operator turns on the switch. .

図１（ａ）は、本発明の好適な第１の実施形態を示す通信光検知器の外観斜視図、図１（ｂ）はその縦断面斜視図である。FIG. 1A is an external perspective view of a communication light detector showing a preferred first embodiment of the present invention, and FIG. 1B is a longitudinal sectional perspective view thereof. 図２（ａ）は、図１に示した通信光検知器の主要部の縦断面図、図２（ｂ）はその漏れ光検知感度のＹ軸方向位置を示す図、図２（ｃ）は接続部の拡大図である。2A is a longitudinal sectional view of the main part of the communication light detector shown in FIG. 1, FIG. 2B is a view showing the position of the leakage light detection sensitivity in the Y-axis direction, and FIG. It is an enlarged view of a connection part. 図３（ａ）は、図１に示した通信光検知器を用いた光モジュールの内部構成を示す斜視図、図３（ｂ）は光検知部の内部構成を示す斜視図である。FIG. 3A is a perspective view showing the internal configuration of the optical module using the communication light detector shown in FIG. 1, and FIG. 3B is a perspective view showing the internal configuration of the light detection unit. 図４（ａ）は比較例の通信光検知器の縦断面図、図４（ｂ）はその漏れ光検知感度のＹ軸方向位置を示す図、図４（ｃ）は漏れ光検知感度のＸ軸方向位置を示す図、図４（ｄ）はその漏れ光検知感度のＺ軸方向位置を示す図である。4A is a longitudinal sectional view of a communication light detector of a comparative example, FIG. 4B is a diagram showing the position of the leakage light detection sensitivity in the Y-axis direction, and FIG. 4C is X of the leakage light detection sensitivity. The figure which shows an axial direction position, FIG.4 (d) is a figure which shows the Z-axis direction position of the leak light detection sensitivity. 本発明の第２の実施形態を示す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 which shows the 2nd Embodiment of this invention.

符号の説明Explanation of symbols

１ 通信光検知器
２ａ，２ｂ 光ファイバ（光伝送路）
３ コア
６ スリーブ
７ 光検知接合体
９ コア部 1 Communication light detector 2a, 2b Optical fiber (optical transmission line)
3 Core 6 Sleeve 7 Optical detection assembly 9 Core part

Claims (7)

光ファイバからなる光伝送路の端部同士をスリーブを介して接続し、その接続部で前記光伝送路の通信光の有無を検知する通信光検知器において、前記スリーブ内の前記接続部に設けられ、前記光伝送路の端部同士と接合すると共に、前記光伝送路のコアと異なる外径のコア部を有する光検知接合体と、前記光検知接合体の上方に設けられ、前記光検知接合体を介して漏れる通信光の漏れ光を検知する光検知部とを備えることを特徴とする通信光検知器。   In a communication light detector for connecting the ends of optical transmission lines made of optical fibers through a sleeve and detecting the presence or absence of communication light in the optical transmission line at the connection part, provided at the connection part in the sleeve A light detection joined body having an outer diameter core portion different from a core of the light transmission path and joined to ends of the light transmission path, and provided above the light detection joined body. A communication light detector, comprising: a light detection unit that detects leakage light of communication light leaking through the joined body. 前記光検知接合体は、その軸方向の長さが前記光伝送路のコアから、前記漏れ光を受光する前記光検知部の受光面までの距離と同等である請求項１記載の通信光検知器。   The communication light detection according to claim 1, wherein the optical detection joined body has an axial length equal to a distance from a core of the optical transmission path to a light receiving surface of the light detection unit that receives the leakage light. vessel. 前記光検知接合体は、前記コア部の周囲に設けられて前記光伝送路のクラッドと同じ外径のクラッド部をさらに備える請求項１又は２記載の通信光検知器。   The communication light detector according to claim 1, wherein the light detection joined body further includes a clad portion that is provided around the core portion and has the same outer diameter as the clad of the optical transmission line. 前記光検知接合体は、フェルールを備える請求項１〜３いずれかに記載の通信光検知器。   The communication light detector according to claim 1, wherein the light detection joined body includes a ferrule. 前記光検知部は、前記漏れ光を受光する受光素子と、前記受光素子にて受光した前記漏れ光を可視光に変換する光出力部とを備える請求項１〜４いずれかに記載の通信光検知器。   The communication light according to claim 1, wherein the light detection unit includes a light receiving element that receives the leaked light and a light output unit that converts the leaked light received by the light receiving element into visible light. Detector. 前記光検知部は、その故障の有無を知らせる故障検知部をさらに備える請求項１〜５いずれかに記載の通信光検知器。   The communication light detector according to any one of claims 1 to 5, wherein the light detection unit further includes a failure detection unit that notifies the presence or absence of the failure. 前記スリーブは、前記光検知接合体を介して漏れる通信光の漏れ光の一部を透過するセラミックスからなる請求項１〜６いずれかに記載の通信光検知器。   The communication light detector according to claim 1, wherein the sleeve is made of ceramic that transmits a part of leakage light of communication light leaking through the light detection bonded body.
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