JP2012252100A - Optical branch coupler and method for manufacturing the same - Google Patents

Optical branch coupler and method for manufacturing the same Download PDF

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JP2012252100A
JP2012252100A JP2011123623A JP2011123623A JP2012252100A JP 2012252100 A JP2012252100 A JP 2012252100A JP 2011123623 A JP2011123623 A JP 2011123623A JP 2011123623 A JP2011123623 A JP 2011123623A JP 2012252100 A JP2012252100 A JP 2012252100A
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optical fiber
line optical
working line
bending
branching coupler
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JP5581271B2 (en
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Tetsuya Manabe
哲也 真鍋
Kazutaka Nando
一貴 納戸
Nagetsu Honda
奈月 本田
Fumiaki Tanaka
郁昭 田中
Yuji Higashi
裕司 東
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Nippon Telegraph and Telephone Corp
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Abstract

PROBLEM TO BE SOLVED: To avoid decline in coupling efficiency in a bent part of an active line optical fiber.SOLUTION: In an optical branch coupler which generates light leak by bending an active line optical fiber 1 and guides the leaked light to a branch line optical fiber 2 by confronting the branch line optical fiber 2 with the active line optical fiber from the leak point side, a primary coating 1A of a bending-applied part of the active line optical fiber 1 is removed to expose an optical fiber element wire 1B, a tip of the optical fiber element wire 2B with a primary coating 2A of the end of the branch line optical fiber 2 removed is confronted with the bending-applied part of the active line optical fiber 1, and in this state, coupling of both optical fibers 1B, 2B is fixed by filling it with an ultraviolet rays curing resin 3 having the same refraction index as that of an optical fiber clad and curing the resin 3 by irradiating the resin 3 with ultraviolet rays.

Description

本発明は、光ファイバケーブル網の建設・保守に使用される光心線対照器、光パルス試験器あるいは光通信器に用いられる光ファイバ側方入出射技術に係り、特に光ファイバ側方入出射に用いられる光分岐カプラとその製造方法に関する。   The present invention relates to an optical fiber side entrance / exit technique used for an optical fiber core contrast device, an optical pulse tester or an optical communication device used for construction / maintenance of an optical fiber cable network, and more particularly to an optical fiber side entrance / exit. The present invention relates to an optical branching coupler and a method for manufacturing the same.

従来、現用線路光ファイバの側面に分岐線路光ファイバを付き当て、現用線路光ファイバから光を出射する技術、または現用線路光ファイバに光を入射する技術が検討されてきた（例えば、特許文献１及び２参照）。
これらの技術は、現用線路光ファイバに曲げを与え、光ファイバ内を伝搬する光信号を光ファイバの側面から放射させ、これを分岐光線路ファイバにて受光する、また現用線路光ファイバ曲げ部に、分岐光線路ファイバから光信号を入射するものである。 Conventionally, a technique has been studied in which a branch line optical fiber is applied to the side surface of the working line optical fiber and light is emitted from the working line optical fiber, or a technique in which light is incident on the working line optical fiber (for example, Patent Document 1). And 2).
These technologies bend the working line optical fiber, radiate the optical signal propagating in the optical fiber from the side surface of the optical fiber, and receive it by the branched optical line fiber. The optical signal is incident from the branched optical line fiber.

特開平７−３８５０２号公報JP-A-7-38502 特開平１１−６４６９１号公報JP-A-11-64691

納戸他、光ファイバ側方入射法の高性能化、2011電子情報通信学会総合大会講演論文集、p324、2011Nado et al., High-performance optical fiber side-incidence method, 2011 IEICE General Conference Proceedings, p324, 2011 宮垣、五次逓減方式の緩和曲線について、鉄道技術連合シンポジウム講演論文集 2003(10)、pp.137-140、2003-12-08、社団法人日本機械学会Miyagaki, About the relaxation curve of the quintuple reduction method, Proceedings of the Symposium of the Railway Technology Association 2003 (10), pp.137-140, 2003-12-08, The Japan Society of Mechanical Engineers

しかしながら、従来の手法は、現用線路光ファイバの曲げ部への光入出射は光ファイバ被覆を通して行うため、被覆部で光の吸収等により結合効率の低下を引き起こしていた。その結合効率の低下を回避するために、現用線路光ファイバの被覆を除去した上で曲げ部を作成することが検討されているが、その場合には、光ファイバの機械的信頼性が著しく低下し、容易に破断してしまうという問題があった。   However, according to the conventional method, since light entering and exiting the bent portion of the working line optical fiber is performed through the optical fiber coating, the coupling efficiency is reduced due to light absorption or the like at the coating portion. In order to avoid a decrease in the coupling efficiency, it has been studied to create a bent portion after removing the coating of the working line optical fiber, but in that case, the mechanical reliability of the optical fiber is significantly reduced. However, there was a problem that it was easily broken.

本発明は、上記の事情に着目してなされたもので、現用線路光ファイバの曲げ部における結合効率低下を回避するとともに、光ファイバの機械的信頼性を維持し、破断を防ぐことのできる光分岐カプラとその製造方法を提供することを目的とする。   The present invention has been made paying attention to the above circumstances, and avoids a decrease in the coupling efficiency at the bent portion of the working line optical fiber, maintains the mechanical reliability of the optical fiber, and prevents breakage. It is an object of the present invention to provide a branch coupler and a method for manufacturing the same.

本発明に係る光分岐カプラは、以下のような態様の構成とする。
（１）現用線路光ファイバを曲げることにより光の漏洩を発生させ、この漏洩箇所側方から分岐線路光ファイバを付き当てることにより前記漏洩された光を前記分岐線路光ファイバに導く光分岐カプラであって、前記現用線路光ファイバの曲げを加える部分の一次被覆を除去して光ファイバ素線を露出させ、前記分岐線路光ファイバの端部の一次被覆を除去した光ファイバ素線の先端部を前記現用線路光ファイバの曲げを加える部分に付き当て、この状態で両光ファイバ素線の結合を、曲げの弾性を保持して固定してなる態様とする。 The optical branching coupler according to the present invention has the following configuration.
(1) An optical branching coupler that causes leakage of light by bending the working line optical fiber and guides the leaked light to the branching line optical fiber by applying a branching line optical fiber from the side of the leakage point. And removing the primary coating of the portion to bend the working line optical fiber to expose the optical fiber strand, and removing the tip of the optical fiber strand from which the primary coating of the end of the branch line optical fiber is removed. The working line optical fiber is applied to a portion to be bent, and in this state, the coupling of both optical fiber strands is fixed while maintaining the bending elasticity.

（２）（１）の構成において、前記現用線路光ファイバの光ファイバ素線に対する前記分岐線路光ファイバの光ファイバ素線の付き当て部分を、光ファイバクラッドと等しい屈折率の紫外線硬化樹脂で充填し、当該樹脂に紫外線を当てて硬化させることで両光ファイバ素線の結合を固定する態様とする。   (2) In the configuration of (1), an abutment portion of the optical fiber of the branch line optical fiber with respect to the optical fiber of the working line optical fiber is filled with an ultraviolet curable resin having a refractive index equal to that of the optical fiber cladding. And it is set as the aspect which fixes the coupling | bonding of both optical fiber strands by making an ultraviolet-ray apply to the said resin and making it harden | cure.

（３）（１）の構成において、前記現用線路光ファイバの光ファイバ素線に対する前記分岐線路光ファイバの光ファイバ素線の付き当て部分を弾性板上に配置し、光ファイバクラッドと等しい屈折率の紫外線硬化樹脂で充填し、当該樹脂に紫外線を当てて硬化させることで両光ファイバ素線の結合を固定する態様とする。   (3) In the configuration of (1), an abutting portion of the optical fiber of the branch line optical fiber with respect to the optical fiber of the working line optical fiber is disposed on an elastic plate, and has a refractive index equal to that of the optical fiber clad. It is set as the aspect which fixes the coupling | bonding of both optical fiber strands by filling with the ultraviolet curable resin of this, and applying the ultraviolet-ray to the said resin and making it harden | cure.

（４）（１）の構成において、前記現用線路光ファイバの光ファイバ素線を弾性板上に直線状に配置して両面テープで固定し、把持具を用いて前記分岐線路光ファイバの光ファイバ素線の先端部を前記現用線路光ファイバの曲げを加える部分に付き当てた状態で前記弾性板に保持する態様とする。   (4) In the configuration of (1), the optical fiber of the branch line optical fiber is arranged using a double-sided tape by linearly arranging the optical fiber of the working line optical fiber on an elastic plate and using a gripping tool. It is set as the aspect hold | maintained at the said elastic board in the state which contact | adhered the front-end | tip part of a strand to the part which adds the bending of the said working line optical fiber.

（５）（１）の構成において、前記分岐線路光ファイバの先端にはＧＲＩＮレンズが装着される態様とする。
（６）（１）の構成において、前記現用線路光ファイバの光ファイバ素線固定部分に曲げを与える持具の曲面形状が緩和曲線である態様とする。 (5) In the configuration of (1), a GRIN lens is attached to the tip of the branch line optical fiber.
(6) In the configuration of (1), the curved surface shape of the holder that bends the optical fiber strand fixing portion of the working line optical fiber is a relaxation curve.

また、本発明に係る光分岐カプラ製造方法は、以下のような態様の構成とする。
（７）現用線路光ファイバを曲げることにより光の漏洩を発生させ、この漏洩箇所側方から分岐線路光ファイバを付き当てることにより前記漏洩された光を前記分岐線路光ファイバに導く光分岐カプラの製造方法であって、前記現用線路光ファイバの曲げを加える部分の一次被覆を除去して光ファイバ素線を露出させ、前記分岐線路光ファイバの端部の一次被覆を除去した光ファイバ素線の先端部を前記現用線路光ファイバの曲げを加える部分に付き当て、この状態で両光ファイバ素線の結合を、曲げの弾性を保持した状態で固定する態様とする。 Moreover, the optical branching coupler manufacturing method according to the present invention has the following configuration.
(7) An optical branching coupler that causes light leakage by bending the working line optical fiber and guides the leaked light to the branching line optical fiber by applying the branching line optical fiber from the side of the leakage point. In the manufacturing method, the primary coating of the portion of the working line optical fiber to be bent is removed to expose the optical fiber, and the primary coating of the end of the branch line optical fiber is removed. The tip is applied to the portion of the working line optical fiber to be bent, and in this state, the coupling of both optical fiber strands is fixed in a state in which the elasticity of bending is maintained.

上記構成による光分岐カプラは、現用線路光ファイバの曲げ部の被覆を除去するようにしているので、結合効率の低下を回避することができ、光ファイバの機械的信頼性を維持することができる。具体的には、被覆を除去した現用線路光ファイバの曲げ部について、（１）現用線路光ファイバと分岐光線路ファイバとの付き当て部を紫外線硬化樹脂で補強する構造、（２）弾性板上で現用線路光ファイバを両面テープで固定し補強する構造、を提案し、更に、破断を防止するために（３）現用線路光ファイバの曲げ形状について緩和曲線を用いる構造とする提案するものである。   In the optical branching coupler having the above configuration, since the coating of the bent portion of the working line optical fiber is removed, a decrease in coupling efficiency can be avoided and the mechanical reliability of the optical fiber can be maintained. . Specifically, with respect to the bent part of the working line optical fiber from which the coating has been removed, (1) a structure in which the contact part between the working line optical fiber and the branching optical line fiber is reinforced with an ultraviolet curable resin, (2) on the elastic plate In order to prevent breakage, (3) a structure using a relaxation curve for the bending shape of the working line optical fiber is proposed. .

したがって、本発明によれば、現用線路光ファイバの曲げ部における結合効率低下を回避するとともに、光ファイバの機械的信頼性を維持し、破断を防ぐことのできる光分岐カプラとその製造方法を提供することができる。   Therefore, according to the present invention, there is provided an optical branching coupler capable of avoiding a reduction in the coupling efficiency at the bent portion of the working line optical fiber, maintaining the mechanical reliability of the optical fiber, and preventing breakage, and a method for manufacturing the same. can do.

本発明の第１の実施形態に係る光分岐カプラの構成を示す断面構成図である。It is a section lineblock diagram showing the composition of the optical branching coupler concerning a 1st embodiment of the present invention. 図１に示す光分岐カプラに曲げを加えた状態を示す断面構成図である。FIG. 2 is a cross-sectional configuration diagram illustrating a state in which the optical branching coupler illustrated in FIG. 1 is bent. 本発明の第２の実施形態に係る光分岐カプラの構成を示す斜視図である。It is a perspective view which shows the structure of the optical branching coupler which concerns on the 2nd Embodiment of this invention. 図３に示す光分岐カプラに曲げを加えた状態を示す斜視図である。It is a perspective view which shows the state which added the bending to the optical branching coupler shown in FIG. 本発明の第３の実施形態に係る光分岐カプラの構成を示す斜視図である。It is a perspective view which shows the structure of the optical branching coupler which concerns on the 3rd Embodiment of this invention. 図５に示す光分岐カプラに曲げを加えた状態を示す斜視図である。It is a perspective view which shows the state which added the bending to the optical branching coupler shown in FIG.

添付の図面を参照して本発明の実施の形態を説明する。以下に説明する実施の形態は本発明の構成の例であり、本発明は、以下の実施の形態に制限されるものではない。
（第１の実施形態）
図１及び図２は、本発明の第１の実施形態に係る光分岐カプラの構成を示す断面構成図である。 Embodiments of the present invention will be described with reference to the accompanying drawings. The embodiment described below is an example of the configuration of the present invention, and the present invention is not limited to the following embodiment.
(First embodiment)
1 and 2 are cross-sectional configuration diagrams showing the configuration of the optical branching coupler according to the first embodiment of the present invention.

先ず、図１に示すように、現用線路光ファイバ１に対して一次被覆１Ａを除去して光ファイバ素線１Ｂを露出させる。その現用線路光ファイバ１を直線状に配置し、その現用線路光ファイバ１の被覆除去部に、分岐線路光ファイバ２の端部の一次被覆２Ａを除去したファイバ素線２Ｂの先端部を側方から付き当てる。この状態で、現用線路光ファイバ１及び分岐線路光ファイバ２の周囲に弾性特性を持ちかつ光ファイバクラッドと同じ屈折率を持つ紫外線硬化樹脂３を充填し、紫外線を照射して樹脂を硬化させ、これによって現用線路光ファイバ１及び分岐線路光ファイバ２を固定する。   First, as shown in FIG. 1, the primary coating 1A is removed from the working line optical fiber 1 to expose the optical fiber 1B. The working line optical fiber 1 is arranged in a straight line, and the end portion of the fiber strand 2B from which the primary coating 2A of the end of the branch line optical fiber 2 is removed is laterally placed on the coating removal portion of the working line optical fiber 1. I guess from. In this state, an ultraviolet curable resin 3 having an elastic characteristic and having the same refractive index as that of the optical fiber cladding is filled around the working line optical fiber 1 and the branch line optical fiber 2, and the resin is cured by irradiating ultraviolet rays. Thus, the working line optical fiber 1 and the branch line optical fiber 2 are fixed.

上記の構造によれば、図２に示すように、紫外線硬化樹脂３で固定した部分をファイバ曲げ持具４に押しつけることにより、現用線路光ファイバ１に曲げを与え、分岐線路光ファイバ２からの光入出射を行うことが可能となる。
上記構成による光分岐カプラが不要になった場合は、ファイバ曲げ持具４から紫外線硬化樹脂３で固定した部分を引き離すことにより、図１の状態に戻すことができる。この時、現用線路光ファイバ１は元通りの直線状態に復帰することから、分岐線路光ファイバ２からの入出射を停止することが可能である。 According to the above structure, as shown in FIG. 2, the working line optical fiber 1 is bent by pressing the portion fixed with the ultraviolet curable resin 3 against the fiber bending fixture 4, and the branch line optical fiber 2 Light incident / exit can be performed.
When the optical branching coupler having the above configuration is not necessary, the state shown in FIG. 1 can be restored by pulling away the portion fixed by the ultraviolet curable resin 3 from the fiber bending fixture 4. At this time, since the working line optical fiber 1 returns to the original linear state, it is possible to stop the incident / exit from the branch line optical fiber 2.

（第２の実施形態）
図３及び図４は、本発明の第２の実施形態に係る光分岐カプラの構成を示す斜視図である。尚、図３及び図４において、図１及び図２と同一部分には同一符号を付して示す。
先ず、図３に示すように、一次被覆１Ａを除去し、光ファイバ素線１Ｂを露出させた現用線路光ファイバ１を平板上の弾性板５の上に直線状に配置し、上方より分岐線路光ファイバ２の端部の一次被覆２Ａを除去したファイバ素線２Ｂの先端部を付き当てる。この状態で、現用線路光ファイバ１及び分岐線路光ファイバ２の周囲に弾性特性を持ちかつ光ファイバクラッドと同じ屈折率を持つ紫外線硬化樹脂６を充填し、紫外線を照射し樹脂を硬化させて現用線路光ファイバ１及び分岐線路光ファイバ２を固定する。 (Second Embodiment)
3 and 4 are perspective views showing the configuration of the optical branching coupler according to the second embodiment of the present invention. 3 and 4, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals.
First, as shown in FIG. 3, the primary coating 1A is removed, and the working line optical fiber 1 from which the optical fiber 1B is exposed is linearly arranged on the elastic plate 5 on the flat plate, and the branch line is formed from above. The tip of the fiber strand 2B from which the primary coating 2A of the end of the optical fiber 2 has been removed is applied. In this state, the working line optical fiber 1 and the branch line optical fiber 2 are filled with an ultraviolet curable resin 6 having elastic characteristics and the same refractive index as the optical fiber cladding, and the resin is irradiated with ultraviolet rays to cure the resin. The line optical fiber 1 and the branch line optical fiber 2 are fixed.

上記構造によれば、図４に示すように、弾性板５をファイバ曲げ持具４に押し付けることにより、現用線路光ファイバ１に曲げを与え、分岐線路光ファイバ２からの光入出射を行うことが可能となる。
上記構成による光分岐カプラが不要になった場合は、ファイバ曲げ持具４から弾性板５を引き離すことにより、図３の状態に戻すことができる。この時、現用線路光ファイバ１は元通りの直線状に復帰することから、分岐線路光ファイバ２からの入出射を停止することが可能である。 According to the above structure, as shown in FIG. 4, by pressing the elastic plate 5 against the fiber bending fixture 4, the working line optical fiber 1 is bent, and light enters and exits from the branch line optical fiber 2. Is possible.
When the optical branching coupler having the above configuration is no longer needed, the state shown in FIG. 3 can be restored by pulling the elastic plate 5 away from the fiber bending fixture 4. At this time, since the working line optical fiber 1 returns to the original straight line shape, it is possible to stop the entrance / exit from the branch line optical fiber 2.

（第３の実施形態）
図５及び図６は、本発明の第３の実施形態に係る光分岐カプラの構成を示す斜視図である。尚、図５及び図６において、図１乃至図４と同一部分には同一符号を付して示す。
先ず、図５に示すように、一次被覆１Ａを除去し、光ファイバ素線１Ｂを露出させた現用線路光ファイバ１を弾性板５に両面テープ７を用いて直線形状に張り付ける。次に、上方より分岐線路光ファイバ２の端部の一次被覆２Ａを除去したファイバ素線２Ｂの先端部を付き当て、分岐線路光ファイバ把持具８で固定する。 (Third embodiment)
5 and 6 are perspective views showing the configuration of an optical branching coupler according to the third embodiment of the present invention. 5 and 6, the same parts as those in FIGS. 1 to 4 are denoted by the same reference numerals.
First, as shown in FIG. 5, the primary coating 1 </ b> A is removed, and the working line optical fiber 1 from which the optical fiber 1 </ b> B is exposed is attached to the elastic plate 5 in a straight line shape using a double-sided tape 7. Next, the tip of the fiber strand 2B from which the primary coating 2A of the end of the branch line optical fiber 2 is removed from above is applied and fixed with the branch line optical fiber gripping tool 8.

上記構造によれば、図６に示すように、弾性板５をファイバ曲げ持具４に押し付けることにより現用線路光ファイバ１に曲げを与え、分岐線路光ファイバ２からの光入出射を行うことが可能となる。
上記構成による光分岐カプラが不要になった場合は、ファイバ曲げ持具５から弾性板５を引き離すことにより、図５の状態に戻すことができる。この時、現用線路光ファイバ１は元通り直線状に復帰することから、分岐線路光ファイバ２からの入出射を停止することが可能である。 According to the above structure, as shown in FIG. 6, the working line optical fiber 1 is bent by pressing the elastic plate 5 against the fiber bending fixture 4, and light is incident and emitted from the branch line optical fiber 2. It becomes possible.
When the optical branching coupler having the above configuration is not necessary, the elastic plate 5 can be pulled away from the fiber bending holder 5 to return to the state shown in FIG. At this time, since the working line optical fiber 1 returns to the original straight line shape, it is possible to stop the entrance and exit from the branch line optical fiber 2.

なお、図１から図６に示した第１、第２及び第３の実施形態において用いた分岐線路光ファイバ２の先端にレンズを装着し、一層の結合効率向上を図ることが可能であることは言うまでもない。例えば非特許文献１に示されているようなＧＲＩＮレンズを用いる技術が利用可能である。   It should be noted that a lens can be attached to the tip of the branch line optical fiber 2 used in the first, second, and third embodiments shown in FIGS. 1 to 6 to further improve the coupling efficiency. Needless to say. For example, a technique using a GRIN lens as shown in Non-Patent Document 1 can be used.

また、ファイバ曲げ持具４の形状としては、従来は、半径３ｍｍ〜１０ｍｍ程度の円形形状が用いられているが、円形形状の曲げ部を用いた場合、光ファイバ１が直線形状から円形形状に変化する部分において急激に応力が発生するため、一次被覆１Ａを除去した光ファイバ素線１Ｂを破断する可能性が高まる。そのため、光ファイバ素線１Ｂの破断を回避するために、ファイバ曲げ持具４の形状としては、例えば非特許文献２のような緩和曲線を用いることが好ましい。ファイバ曲げ持具４の形状を緩和曲線にすることにより、直線から曲げ部における光ファイバ１にかかる応力を徐々に変化させることが可能となり、光ファイバ素線１Ｂの破断を回避することができる。   Moreover, as the shape of the fiber bending fixture 4, a circular shape having a radius of about 3 mm to 10 mm is conventionally used. However, when a circular bending portion is used, the optical fiber 1 is changed from a linear shape to a circular shape. Since stress is suddenly generated in the changing portion, the possibility of breaking the optical fiber 1B from which the primary coating 1A has been removed increases. Therefore, in order to avoid the breakage of the optical fiber 1 </ b> B, it is preferable to use a relaxation curve as in Non-Patent Document 2, for example, as the shape of the fiber bending holder 4. By making the shape of the fiber bending tool 4 a relaxation curve, it is possible to gradually change the stress applied to the optical fiber 1 at the bent portion from the straight line, and to avoid the breakage of the optical fiber 1B.

以上のように、上記の実施形態によれば、現用線路光ファイバ１の曲げ部の被覆を除去して結合効率低下を回避するとともに、光ファイバ１の機械的信頼性を維持し、破断を防ぐ光分岐カプラの実現が可能となる。
尚、本発明は上記実施形態そのままに限定されるものではなく、実施段階ではその要旨を逸脱しない範囲で構成要素を変形して具体化できる。また、上記実施形態に開示されている複数の構成要素の適宜な組み合わせにより、種々の発明を形成できる。例えば、実施形態に示される全構成要素から幾つかの構成を削除してもよい。さらに、異なる実施形態例に亘る構成要素を適宜組み合わせてもよい。 As described above, according to the above-described embodiment, the coating of the bent portion of the working line optical fiber 1 is removed to avoid a reduction in coupling efficiency, and the mechanical reliability of the optical fiber 1 is maintained to prevent breakage. An optical branching coupler can be realized.
Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying the constituent elements without departing from the scope of the invention in the implementation stage. In addition, various inventions can be formed by appropriately combining a plurality of components disclosed in the embodiment. For example, some configurations may be deleted from all the components shown in the embodiment. Furthermore, constituent elements over different example embodiments may be combined as appropriate.

１…現用線路光ファイバ、１Ａ…一次被覆、１Ｂ…光ファイバ素線、２…分岐線路光ファイバ、２Ａ…一次被覆、２Ｂ…ファイバ素線、３…紫外線硬化樹脂、４…ファイバ曲げ持具、５…弾性板、６…紫外線硬化樹脂、７…両面テープ、８…分岐線路光ファイバ把持具。   DESCRIPTION OF SYMBOLS 1 ... Working line optical fiber, 1A ... Primary coating, 1B ... Optical fiber strand, 2 ... Branch line optical fiber, 2A ... Primary coating, 2B ... Fiber strand, 3 ... Ultraviolet curable resin, 4 ... Fiber bending holder, DESCRIPTION OF SYMBOLS 5 ... Elastic plate, 6 ... Ultraviolet curable resin, 7 ... Double-sided tape, 8 ... Branch line optical fiber holding tool.

Claims (7)

現用線路光ファイバを曲げることにより光の漏洩を発生させ、この漏洩箇所側方から分岐線路光ファイバを付き当てることにより前記漏洩された光を前記分岐線路光ファイバに導く光分岐カプラであって、
前記現用線路光ファイバの曲げを加える部分の一次被覆を除去して光ファイバ素線を露出させ、
前記分岐線路光ファイバの端部の一次被覆を除去した光ファイバ素線の先端部を前記現用線路光ファイバの曲げを加える部分に付き当て、
この状態で両光ファイバ素線の結合を、曲げの弾性を保持して固定してなることを特徴とする光分岐カプラ。 An optical branching coupler that generates light leakage by bending the working line optical fiber, and guides the leaked light to the branching line optical fiber by applying a branching line optical fiber from the side of the leakage point,
Removing the primary coating of the portion to bend the working line optical fiber to expose the optical fiber;
The tip of the optical fiber from which the primary coating at the end of the branch line optical fiber has been removed is applied to the portion to bend the working line optical fiber,
In this state, an optical branching coupler is characterized in that the coupling of both optical fiber strands is fixed while maintaining the elasticity of bending. 前記現用線路光ファイバの光ファイバ素線に対する前記分岐線路光ファイバの光ファイバ素線の付き当て部分を、光ファイバクラッドと等しい屈折率の紫外線硬化樹脂で充填し、当該樹脂に紫外線を当てて硬化させることで両光ファイバ素線の結合を固定するようにしたことを特徴とする請求項１記載の光分岐カプラ。   An abutment portion of the optical fiber of the branch line optical fiber with respect to the optical fiber of the working line optical fiber is filled with an ultraviolet curable resin having a refractive index equal to that of the optical fiber cladding, and the resin is cured by being irradiated with ultraviolet rays. The optical branching coupler according to claim 1, wherein the coupling of both the optical fiber strands is fixed by performing the operation. 前記現用線路光ファイバの光ファイバ素線に対する前記分岐線路光ファイバの光ファイバ素線の付き当て部分を弾性板上に配置し、光ファイバクラッドと等しい屈折率の紫外線硬化樹脂で充填し、当該樹脂に紫外線を当てて硬化させることで両光ファイバ素線の結合を固定するようにしたことを特徴とする請求項１記載の光分岐カプラ。   An abutting portion of the optical fiber element of the branch line optical fiber with respect to the optical fiber element of the working line optical fiber is disposed on an elastic plate and filled with an ultraviolet curable resin having a refractive index equal to that of the optical fiber clad. 2. The optical branching coupler according to claim 1, wherein the coupling of both optical fiber strands is fixed by applying ultraviolet rays to the optical fiber. 前記現用線路光ファイバの光ファイバ素線を弾性板上に直線状に配置して両面テープで固定し、
把持具を用いて前記分岐線路光ファイバの光ファイバ素線の先端部を前記現用線路光ファイバの曲げを加える部分に付き当てた状態で前記弾性板に保持することを特徴とする請求項１記載の光分岐カプラ。 Place the optical fiber strand of the working line optical fiber linearly on an elastic plate and fix it with double-sided tape,
2. The holding member is held by the elastic plate in a state in which a tip end portion of the optical fiber of the branch line optical fiber is applied to a portion of the working line optical fiber to be bent. Optical branching coupler. 前記分岐線路光ファイバの先端にはＧＲＩＮレンズが装着されることを特徴とする請求項１記載の光分岐カプラ。   2. The optical branching coupler according to claim 1, wherein a GRIN lens is attached to a tip of the branch line optical fiber. 前記現用線路光ファイバの光ファイバ素線固定部分に曲げを与える持具として、曲面形状が緩和曲線であることを特徴とする請求項１記載の光分岐カプラ。   2. The optical branching coupler according to claim 1, wherein the curved shape is a relaxation curve as a holder for bending the optical fiber strand fixing portion of the working line optical fiber. 現用線路光ファイバを曲げることにより光の漏洩を発生させ、この漏洩箇所側方から分岐線路光ファイバを付き当てることにより前記漏洩された光を前記分岐線路光ファイバに導く光分岐カプラの製造方法であって、
前記現用線路光ファイバの曲げを加える部分の一次被覆を除去して光ファイバ素線を露出させ、
前記分岐線路光ファイバの端部の一次被覆を除去した光ファイバ素線の先端部を前記現用線路光ファイバの曲げを加える部分に付き当て、
この状態で両光ファイバ素線の結合を、曲げの弾性を保持した状態で固定することを特徴とする光分岐カプラの製造方法。 A method of manufacturing an optical branching coupler that causes leakage of light by bending the working line optical fiber and guides the leaked light to the branching line optical fiber by applying a branching line optical fiber from the side of the leakage point. There,
Removing the primary coating of the portion to bend the working line optical fiber to expose the optical fiber;
The tip of the optical fiber from which the primary coating at the end of the branch line optical fiber has been removed is applied to the portion to bend the working line optical fiber,
In this state, the coupling of both optical fiber strands is fixed in a state where the bending elasticity is maintained.
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