JP2011158768A - Multi-core optical fiber and connecting method of multi-core optical fiber - Google Patents

Multi-core optical fiber and connecting method of multi-core optical fiber Download PDF

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JP2011158768A
JP2011158768A JP2010021253A JP2010021253A JP2011158768A JP 2011158768 A JP2011158768 A JP 2011158768A JP 2010021253 A JP2010021253 A JP 2010021253A JP 2010021253 A JP2010021253 A JP 2010021253A JP 2011158768 A JP2011158768 A JP 2011158768A
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JP5413222B2 (en
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Takashi Sasaki
隆 佐々木
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Sumitomo Electric Industries Ltd
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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
    • G02B6/02—Optical fibres with cladding with or without a coating
    • G02B6/02042—Multicore optical fibres
    • 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
    • G02B6/3873—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls
    • G02B6/3886—Magnetic means to align ferrule ends
    • 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
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4479—Manufacturing methods of optical cables
    • G02B6/4482—Code or colour marking

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
  • Mechanical Coupling Of Light Guides (AREA)
  • Optical Couplings Of Light Guides (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multi-core optical fiber in which loss at a connected part is reduced by highly accurate positioning, and to provide a connecting method of multi-core optical fibers. <P>SOLUTION: By magnetism of alignment markers 61, 62 of a position adjusting implement 2, the alignment markers 61, 62 and markers 41, 42 of multi-core optical fiber 1 are attracted to each other, and in the through-hole 51 of the position adjusting implement 2, the multi-core optical fiber 1 is highly accurately positioned, and the core is properly arranged. Then, by connecting the multi-core optical fibers 1 to each other in which the cores are properly arranged by the position adjusting implement 2, loss at a connected part is reduced. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、マルチコア光ファイバ及びマルチコア光ファイバの接続方法に関する。   The present invention relates to a multicore optical fiber and a method for connecting multicore optical fibers.

一つのコアがクラッドに覆われた光ファイバであるシングルコア光ファイバを接続する方法として、例えば特許文献１，２に示す方法が知られている。また、それぞれが光学的に独立した光導波路として機能する複数のコアが単一のクラッド内に配列されたマルチコア光ファイバ同士を接続する方法として、例えば、特許文献３，４に示す方法が開示されている。   For example, methods disclosed in Patent Documents 1 and 2 are known as methods for connecting a single core optical fiber, which is an optical fiber in which one core is covered with a clad. Further, as a method of connecting multi-core optical fibers in which a plurality of cores each functioning as an optically independent optical waveguide are arranged in a single cladding, for example, methods disclosed in Patent Documents 3 and 4 are disclosed. ing.

特開２００２−１４８４６７号公報JP 2002-148467 A 特許第２７５９１１３号公報Japanese Patent No. 2759113 特開２００１−２２８３６１号公報JP 2001-228361 A 特開２００９−０２０３４７号公報JP 2009-020347 A

近年、極細径・超高密度化が進められたマルチコア光ファイバ同士を接続する際には、接続対象となるマルチコア光ファイバとの間で複数のコアをそれぞれ正しい位置に合わせて接続する必要がある。しかしながら、マルチコア光ファイバは、複数のコアを含んで構成されているために、そのコアの位置を正確に把握するためには端面を観察する必要がある。また、例えば、特許文献３記載の発明のようにマルチコア光ファイバ上にマークをつけてこのマークの位置に基づいて接続を行う場合には、クラッドの表面にマーキングを付与することによる光ファイバの強度が劣化しやすいという懸念があるという実用上の問題に加え、マークの位置を正確に認識する必要があり、そのためには非常に細かい作業が要求される。このように、上記の特許文献１〜４記載の接続方法では十分な精度を得られず、接続部分での損失を増大させる可能性がある。   In recent years, when connecting multi-core optical fibers whose ultrafine diameter and ultra-high density have been advanced, it is necessary to connect multiple cores to each other in the correct position with the multi-core optical fiber to be connected. . However, since the multi-core optical fiber is configured to include a plurality of cores, it is necessary to observe the end face in order to accurately grasp the position of the core. In addition, for example, when a mark is formed on a multi-core optical fiber and a connection is made based on the position of this mark as in the invention described in Patent Document 3, the strength of the optical fiber by providing a marking on the surface of the cladding In addition to the practical problem that there is a concern that the mark is likely to deteriorate, it is necessary to accurately recognize the position of the mark, which requires extremely fine work. As described above, the connection methods described in Patent Documents 1 to 4 cannot obtain sufficient accuracy, and may increase the loss at the connection portion.

本発明は上記を鑑みてなされたものであり、高精度に位置決めをすることで接続箇所での損失が低減されたマルチコア光ファイバ及びマルチコア光ファイバの接続方法を提供することを目的とする。   The present invention has been made in view of the above, and an object of the present invention is to provide a multi-core optical fiber and a multi-core optical fiber connection method in which loss at a connection portion is reduced by positioning with high accuracy.

上記目的を達成するため、本発明に係るマルチコア光ファイバは、クラッドと、その周囲がそれぞれ当該クラッドに覆われると共に光軸方向に延びる複数のコアと、当該クラッドを覆う被覆部と、を備え、複数のコアのうちの特定のコアの位置を識別するための磁性体からなるマーカーが被覆部に設けられたことを特徴とする。   In order to achieve the above object, a multi-core optical fiber according to the present invention includes a cladding, a plurality of cores each of which is covered by the cladding and extending in the optical axis direction, and a covering portion that covers the cladding, A marker made of a magnetic material for identifying the position of a specific core among the plurality of cores is provided on the covering portion.

また、本発明に係るマルチコア光ファイバ接続方法は、クラッドと、その周囲がそれぞれ当該クラッドに覆われると共に光軸方向に延びる複数のコアと、当該クラッドを覆う被覆部とを備えた２本のマルチコア光ファイバを調芯台に載せ、調芯台を操作して、２本のマルチコア光ファイバの調芯を行って、２本のマルチコア光ファイバを接続するマルチコア光ファイバの接続方法であって、２本のマルチコア光ファイバは、複数のコアのうちの特定のコアの位置を識別するための磁性体からなるマーカーを被覆部に塗布して形成した認識部が設けられ、マルチコア光ファイバの外周に嵌合し、円周上の特定位置に磁性体アライメントマーカーを有する円筒体の位置調整用治具を準備し、マルチコア光ファイバを位置調整用治具に挿入し、アライメントマーカーと認識部を磁性体の磁力で一致させ、一致させた状態の位置調整用治具を、調芯台に載せ、アライメントマーカーの円周方向の位置を一致させることを特徴とする。   The multi-core optical fiber connection method according to the present invention includes two multi-cores including a clad, a plurality of cores each of which is surrounded by the clad and extending in the optical axis direction, and a covering portion covering the clad. A multi-core optical fiber connection method for connecting two multi-core optical fibers by placing an optical fiber on an alignment table, operating the alignment table to align two multi-core optical fibers, The multi-core optical fiber of this book is provided with a recognition part formed by applying a marker made of a magnetic material for identifying the position of a specific core among a plurality of cores to the covering part, and is fitted on the outer periphery of the multi-core optical fiber. Prepare a cylindrical position adjustment jig having a magnetic alignment marker at a specific position on the circumference, and insert the multi-core optical fiber into the position adjustment jig. The placement marker recognition unit are matched with the magnetic force of the magnetic body, the position adjustment jig in the state-matched, placed in alignment table, characterized in that to match the circumferential positions of the alignment markers.

上記のマルチコア光ファイバ及びマルチコア光ファイバ接続方法によれば、位置調整用治具のアライメントマーカーの磁力により、マルチコア光ファイバの被覆部に形成された磁性体のマーカーからなる認識部とアライメントマーカーとが引き合い、位置調整用治具の内部においてマルチコア光ファイバの位置決めが高精度に行われ、コアが適切に配置される。そして、調芯台において、この位置調整用治具によりコアが適切に配置された２本のマルチコア光ファイバの調芯をして、両者を接続することにより、接続箇所での損失が低減される。   According to the multi-core optical fiber and the multi-core optical fiber connection method described above, the recognition unit including the magnetic marker formed on the coating unit of the multi-core optical fiber and the alignment marker are caused by the magnetic force of the alignment marker of the position adjusting jig. As a result, the positioning of the multi-core optical fiber is performed with high accuracy inside the jig for position adjustment, and the core is appropriately arranged. Then, in the aligning table, by aligning the two multi-core optical fibers in which the cores are appropriately arranged by the position adjusting jig and connecting the two multi-core optical fibers, the loss at the connection point is reduced. .

ここで、上記のマルチコア光ファイバ接続方法では、融着により２本のマルチコア光ファイバを接続する態様とすることができる。   Here, in the above multicore optical fiber connection method, two multicore optical fibers can be connected by fusion.

また、コネクタ加工により、又は、メカニカルスプライサを用いて、２本のマルチコア光ファイバを接続する態様とすることもできる。   Moreover, it can also be set as the aspect which connects two multi-core optical fibers by a connector process or using a mechanical splicer.

本発明によれば、高精度に位置決めをすることで接続箇所での損失が低減されたマルチコア光ファイバ及びマルチコア光ファイバの接続方法が提供される。   ADVANTAGE OF THE INVENTION According to this invention, the connection method of the multi-core optical fiber and the multi-core optical fiber with which the loss in a connection location was reduced by positioning with high precision is provided.

本発明の実施形態に係るマルチコア光ファイバの構成を示す図である。It is a figure which shows the structure of the multi-core optical fiber which concerns on embodiment of this invention. 本発明の実施形態に係る位置調整用治具の構成を示す図である。It is a figure which shows the structure of the jig | tool for position adjustment which concerns on embodiment of this invention. 位置調整用治具を用いたマルチコア光ファイバの接続方法を説明する図である。It is a figure explaining the connection method of the multi-core optical fiber which used the jig | tool for position adjustment.

以下、添付図面を参照して、本発明を実施するための形態を詳細に説明する。なお、図面の説明においては同一要素には同一符号を付し、重複する説明を省略する。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.

図１は、本発明の実施形態に係るマルチコア光ファイバの構成を示す図である。図１に示すように、マルチコア光ファイバ１は、クラッド１０と、ファイバ中心の光軸ＡＸに沿ってそれぞれ伸び、その周囲がクラッド１０で覆われた複数のコア２１〜２４と、この裸光ファイバの外周に設けられた樹脂からなる被覆部３０を備える。なお、本実施形態で説明するマルチコア光ファイバ１では、複数のコア２１〜２４が１つのクラッド１０で覆われ、４つのコア２１〜２４がファイバ中心の光軸ＡＸに対して４回対称となるように配置されているが、この構成は種々の変更が可能である。また、コアの数も限定されない。 FIG. 1 is a diagram illustrating a configuration of a multi-core optical fiber according to an embodiment of the present invention. As shown in FIG. 1, the multi-core optical fiber 1, the clad 10, each extending along the optical axis A X of the fiber center, and a plurality of cores 21 to 24 around is covered with the cladding 10, the bare optical A coating portion 30 made of resin is provided on the outer periphery of the fiber. In the multi-core optical fiber 1 is described in the present embodiment, a plurality of cores 21 to 24 are covered by a single cladding 10, and the 4-fold symmetry four cores 21-24 with respect to the optical axis A X of the fiber center However, the configuration can be variously changed. Further, the number of cores is not limited.

このマルチコア光ファイバ１では、コア２１，２３の位置を識別するための磁性体からなるマーカー４１，４２（認識部）が、クラッド１０を覆う被覆部３０において、光軸Ａｘ方向（長手方向）に沿って設けられている。このマーカー４１，４２は、調芯台においてマルチコア光ファイバ１の調芯を行う際に、コア２１，２３の位置を確認するために設けられていて、磁性記憶に用いられる磁性体粉末材料をフィルム状にしたものである。 In this multi-core optical fiber 1, markers 41 and 42 (recognition portions) made of a magnetic material for identifying the positions of the cores 21 and 23 are arranged in the optical axis Ax direction (longitudinal direction) in the covering portion 30 that covers the clad 10. It is provided along. The markers 41 and 42 are provided to confirm the positions of the cores 21 and 23 when the multi-core optical fiber 1 is aligned on the alignment table, and a magnetic powder material used for magnetic memory is formed into a film. It is what I made.

マルチコア光ファイバ１に対してマーカー４１，４２を設ける方法は特に限定されないが、例えば、以下の方法がある。すなわち、クラッド１０とコア２１〜２４とにより形成された線引き直後の裸光ファイバに対して、被覆部３０を形成する樹脂を塗布する前に、磁性体粉末材料を含んでマーカー４１，４２となる材料を噴射し、被覆部３０の最外周に付着させる方法や、プライマリ被覆を付着させセカンダリ被覆を付着する間に噴射し、このマーカー４１，４２となる材料を固着させることで被覆部３０に形成する方法を用いることもできる。の裸光ファイバを樹脂からなる被覆部３０により覆った後に、マーカー４１，４２を設ける位置の樹脂を部分的に除去して、マーカー４１，４２となる材料を塗布する方法等が挙げられる。なお、マーカー４１，４２の数や位置は特に限定されないが、各マーカーは、特定のコアを識別するために設けられることから、被覆部３０のうち識別対象となるコアに対してより近接する位置に設けられることが好ましい。   Although the method of providing the markers 41 and 42 with respect to the multi-core optical fiber 1 is not particularly limited, for example, there are the following methods. That is, before the resin for forming the covering portion 30 is applied to the bare optical fiber formed by the clad 10 and the cores 21 to 24 immediately after drawing, the magnetic powder material is included to become the markers 41 and 42. Formed on the covering portion 30 by spraying material and attaching it to the outermost periphery of the covering portion 30, or spraying while attaching the primary covering and attaching the secondary covering, and fixing the material to be the markers 41 and 42 It is also possible to use a method of For example, after the bare optical fiber is covered with the coating portion 30 made of resin, the resin at the position where the markers 41 and 42 are provided is partially removed, and a material that becomes the markers 41 and 42 is applied. In addition, although the number and position of the markers 41 and 42 are not particularly limited, since each marker is provided to identify a specific core, the position closer to the core to be identified in the covering portion 30. It is preferable to be provided.

ここで、上記の磁性体からなるマーカー４１，４２のほかにも、コアの配列方向を特定するためのマーカーを施すこともできる。例えば、一方の端部では、複数のコアＡ，Ｂ，Ｃがこの順序で配列し、逆側の端部では、逆の順序、すなわち、Ａ，Ｃ，Ｂの順序で配列しているようなマルチコア光ファイバを接続する場合には、予め端部のコアの配列の方向を知っていることが重要である。この場合には、コアの配列が特定できるように、特定のコアを識別する磁性体を用いたマーカー４１，４２のほかに、配列方向を識別することができる配列マーカーを１箇所以上に設けておくことが良い。このとき、配列マーカーの形状と、磁性体からなるマーカーの形状とを互いに異ならせておくことで、外観からも配列マーカーを識別しやすくなる。ここで、容易に区別可能なマーカーの形状としては、マーカーの幅、線種（実線、破線、１点鎖線等）、色等が挙げられる。磁性体からなる複数のマーカーの間でもこれらの形状を変更することで、どのマーカーがどのコアを識別するためのものかを区別しやすくなる。なお、配列方向を識別するための配列マーカーは、磁性体からなる必要はない。   Here, in addition to the markers 41 and 42 made of the magnetic material, a marker for specifying the arrangement direction of the cores can be provided. For example, at one end, a plurality of cores A, B, and C are arranged in this order, and at the opposite end, they are arranged in the reverse order, that is, the order of A, C, and B. When connecting multi-core optical fibers, it is important to know the direction of the end core arrangement in advance. In this case, in order to be able to specify the core arrangement, in addition to the markers 41 and 42 using a magnetic material for identifying a specific core, an arrangement marker that can identify the arrangement direction is provided at one or more places. It is good to leave. At this time, by making the shape of the array marker different from the shape of the marker made of a magnetic material, the array marker can be easily identified from the appearance. Here, marker shapes that can be easily distinguished include marker width, line type (solid line, broken line, one-dot chain line, etc.), color, and the like. By changing these shapes even between a plurality of markers made of a magnetic material, it becomes easy to distinguish which marker is for identifying which core. The array marker for identifying the array direction need not be made of a magnetic material.

次に、２本のマルチコア光ファイバ１を接続する際の位置決めに用いられる位置調整用治具について説明する。図２は、本実施形態に係る位置調整用治具２の構成を示す図である。図２に示すように、位置調整用治具２は、略円筒形の形状の本体５０からなり、その中央に、マルチコア光ファイバ１の外周（被覆部３０の形状）に嵌合するようにその内周が形成された貫通孔５１が設けられる。そして、この貫通孔５１の内面には、磁石からなるアライメントマーカー６１，６２が設けられている。このアライメントマーカー６１，６２は、マルチコア光ファイバ１に設けられたマーカー４１，４２に対応した位置に設けられている。そして、アライメントマーカー６１，６２は、例えば、磁石を貫通孔５１の内面に貼り付けた構成としてもよいし、図２に示す貫通孔５１の内面に設けられたアライメントマーカー６１，６２の下側の位置調整用治具２の内部（貫通孔５１の延在方向に対して垂直な面で切断した場合の外周側）に磁石を埋め込む。図２の位置調整用治具２のように、図示手前側の所謂ドーナツ状の端部にもアライメントマーカー６１，６２又はその位置を示すマークを示しておくことで、端部側から位置調整用治具を見た場合にもアライメントマーカー６１，６２の位置を容易に確認することができる。マルチコア光ファイバ１は、マーカーを参照して配列方向を確認した上で貫通孔５１内に挿入されて、回転自在に保持される。マーカー４１，４２がアライメントマーカー６１，６２と合致する位置に回転したときに、マーカー４１，４２とアライメントマーカー６１，６２とが磁力により引き合ってこの磁力で保持される。このように、マルチコア光ファイバ１が貫通孔５１内で保持された状態で、マルチコア光ファイバ１と位置調整用治具２を固定する。   Next, a position adjusting jig used for positioning when connecting two multi-core optical fibers 1 will be described. FIG. 2 is a diagram illustrating a configuration of the position adjusting jig 2 according to the present embodiment. As shown in FIG. 2, the position adjusting jig 2 is composed of a substantially cylindrical main body 50, and the center thereof is fitted to the outer periphery of the multi-core optical fiber 1 (the shape of the covering portion 30). A through hole 51 having an inner periphery is provided. In addition, alignment markers 61 and 62 made of magnets are provided on the inner surface of the through hole 51. The alignment markers 61 and 62 are provided at positions corresponding to the markers 41 and 42 provided on the multi-core optical fiber 1. And the alignment markers 61 and 62 are good also as a structure which affixed the magnet on the inner surface of the through-hole 51, for example, and the lower side of the alignment markers 61 and 62 provided in the inner surface of the through-hole 51 shown in FIG. A magnet is embedded in the position adjusting jig 2 (on the outer peripheral side when cut by a plane perpendicular to the extending direction of the through hole 51). Like the position adjusting jig 2 in FIG. 2, the so-called donut-shaped end portion on the front side of the figure is also provided with the alignment markers 61 and 62 or marks indicating the position thereof for adjusting the position from the end portion side. Even when the jig is viewed, the positions of the alignment markers 61 and 62 can be easily confirmed. The multi-core optical fiber 1 is inserted into the through hole 51 after confirming the arrangement direction with reference to the marker, and is held rotatably. When the markers 41 and 42 are rotated to positions that match the alignment markers 61 and 62, the markers 41 and 42 and the alignment markers 61 and 62 are attracted by the magnetic force and held by the magnetic force. Thus, the multi-core optical fiber 1 and the position adjusting jig 2 are fixed in a state where the multi-core optical fiber 1 is held in the through hole 51.

次に、この位置調整用治具２を用いて２つのマルチコア光ファイバ１の接続を行う方法にういて説明する。図３は、位置調整用治具２を用いたマルチコア光ファイバ１（１Ａ，１Ｂ）の接続方法を説明する図である。   Next, a method for connecting two multi-core optical fibers 1 using the position adjusting jig 2 will be described. FIG. 3 is a diagram for explaining a method of connecting the multi-core optical fibers 1 (1A, 1B) using the position adjusting jig 2. FIG.

まず、図３に示すように、２本のマルチコア光ファイバ１Ａ，１Ｂの調芯を行う調芯台（図示省略）において、高さ調整が可能な２つの対向するＶ溝（図示省略）を対向して配置する。次に、位置調整用治具２Ａのアライメントマーカー６１Ａと位置調整用治具２Ｂのアライメントマーカー６１Ｂとが対向するとともに、位置調整用治具２Ａのアライメントマーカー６２Ａと位置調整用治具２Ｂのアライメントマーカー６２Ｂとが対向するように、位置調整用治具２Ａ，２Ｂが配置される。なお、高さ方向においては、位置調整用治具２Ａ，２Ｂの貫通孔同士が同じ位置となるように、一方のＶ溝の位置を調整する。   First, as shown in FIG. 3, in an aligning base (not shown) for aligning the two multi-core optical fibers 1A and 1B, two opposing V-grooves (not shown) capable of height adjustment are opposed to each other. And place it. Next, the alignment marker 61A of the position adjustment jig 2A and the alignment marker 61B of the position adjustment jig 2B face each other, and the alignment marker 62A of the position adjustment jig 2A and the alignment marker of the position adjustment jig 2B Position adjustment jigs 2A and 2B are arranged so as to face 62B. In the height direction, the position of one V-groove is adjusted so that the through holes of the position adjusting jigs 2A and 2B are at the same position.

そして、この調芯されたマルチコア光ファイバ１Ａ，１Ｂの端部を接続することで、２本のマルチコア光ファイバ１Ａ，１Ｂのコア同士、すなわち、コア２１Ａと２１Ｂとの間、２２Ａと２２Ｂとの間、２３Ａと２３Ｂとの間、及び、２４Ａと２４Ｂとの間が精度よく接続される。なお、２本のマルチコア光ファイバ１Ａ，１Ｂの接続方法としては、融着接続、コネクタ加工、メカニカルスプライサを用いる方法等が挙げられる。いずれの方法においても、上記の位置調整用治具２を用いて位置決めを利用することができる。   Then, by connecting the ends of the aligned multi-core optical fibers 1A and 1B, the cores of the two multi-core optical fibers 1A and 1B, that is, between the cores 21A and 21B, and between 22A and 22B, , 23A and 23B, and 24A and 24B are connected with high accuracy. Examples of a method for connecting the two multi-core optical fibers 1A and 1B include fusion splicing, connector processing, and a method using a mechanical splicer. In any method, the positioning can be used by using the position adjusting jig 2 described above.

このように、本実施形態に係るマルチコア光ファイバ１及び位置調整用治具２を用いたマルチコア光ファイバ１の接続方法によれば、位置調整用治具２のアライメントマーカー６１，６２の磁力により、アライメントマーカー６１，６２とマルチコア光ファイバ１のマーカー４１，４２とがそれぞれ引き合い、位置調整用治具２の貫通孔５１内においてマルチコア光ファイバ１の位置決めが高精度に行われ、コアが適切に配置される。そして、この位置調整用治具２によりコアが適切に配置されたマルチコア光ファイバ１同士を接続することにより、接続箇所での損失が低減される。   Thus, according to the connection method of the multi-core optical fiber 1 using the multi-core optical fiber 1 and the position adjusting jig 2 according to the present embodiment, due to the magnetic force of the alignment markers 61 and 62 of the position adjusting jig 2, The alignment markers 61 and 62 and the markers 41 and 42 of the multi-core optical fiber 1 are attracted to each other so that the multi-core optical fiber 1 is positioned with high accuracy in the through hole 51 of the position adjusting jig 2 and the cores are appropriately arranged. Is done. And the loss in a connection location is reduced by connecting the multi-core optical fibers 1 by which the core is arrange | positioned appropriately with this jig | tool 2 for position adjustment.

従来のように位置調整用治具を用いず２つのマルチコア光ファイバの接続を行う場合、マルチコア光ファイバ１の位置を正確に把握するには、その端面を正確に観察する必要があった。ファイバ上にマーカーを施しただけの場合には、その確認が大変であった。しかしながら、本実施形態のように位置調整用治具２を用いたマルチコア光ファイバ１の接続方法を用いることで、事前に位置調整用治具２のアライメントマーカー６１，６２の位置を確認することにより、２本のマルチコア光ファイバ１のコアの位置を容易に確認することができ、より簡単な方法で、より高精度な位置決め・接続を行うことができる。本実施形態では、位置調整用治具２とマルチコア光ファイバ１との位置調整は、磁力を用いて、容易に行うことができる。   When connecting two multi-core optical fibers without using a position adjusting jig as in the prior art, in order to accurately grasp the position of the multi-core optical fiber 1, it is necessary to accurately observe the end face. It was difficult to confirm when the marker was only applied on the fiber. However, by using the connection method of the multi-core optical fiber 1 using the position adjusting jig 2 as in this embodiment, the positions of the alignment markers 61 and 62 of the position adjusting jig 2 are confirmed in advance. The positions of the cores of the two multi-core optical fibers 1 can be easily confirmed, and more accurate positioning and connection can be performed by a simpler method. In the present embodiment, the position adjustment between the position adjusting jig 2 and the multi-core optical fiber 1 can be easily performed using a magnetic force.

なお、位置調整用治具２は複数の部材から構成されていてもよく、例えば、貫通孔を有する円筒を、貫通孔に沿って半割にしたような２つの部材によって、マルチコア光ファイバを挟むような構造とすることもできる。この場合、２つの部材の外周を保持するような部材をさらに用いることで、マルチコア光ファイバを挟む２つの部材を固定することが可能となる。   The position adjusting jig 2 may be composed of a plurality of members. For example, the multi-core optical fiber is sandwiched between two members that halve a cylinder having a through hole along the through hole. It can also be set as such a structure. In this case, by further using a member that holds the outer periphery of the two members, it is possible to fix the two members that sandwich the multi-core optical fiber.

１（１Ａ，１Ｂ）…マルチコア光ファイバ、２（２Ａ，２Ｂ）…位置調整用治具、１０…クラッド、２１〜２４（２１Ａ〜２４Ａ，２１Ｂ〜２４Ｂ）…コア、３０…被覆部、４１，４２（４１Ａ，４１Ｂ，４２Ａ，４２Ｂ）…マーカー、５０…本体、５１…貫通孔、６１，６２（６１Ａ，６１Ｂ，６２Ａ，６２Ｂ）…アライメントマーカー。
DESCRIPTION OF SYMBOLS 1 (1A, 1B) ... Multi-core optical fiber, 2 (2A, 2B) ... Position adjustment jig, 10 ... Cladding, 21-24 (21A-24A, 21B-24B) ... Core, 30 ... Covering part, 41, 42 (41A, 41B, 42A, 42B) ... marker, 50 ... main body, 51 ... through hole, 61, 62 (61A, 61B, 62A, 62B) ... alignment marker.

Claims (4)

クラッドと、その周囲がそれぞれ当該クラッドに覆われると共に光軸方向に延びる複数のコアと、当該クラッドを覆う被覆部とを備え、
前記複数のコアのうちの特定のコアの位置を識別するための磁性体からなるマーカーが前記被覆部に設けられた
ことを特徴とするマルチコア光ファイバ。 A clad, a plurality of cores each of which is covered by the clad and extending in the optical axis direction, and a covering portion covering the clad,
A multi-core optical fiber, wherein a marker made of a magnetic material for identifying a position of a specific core among the plurality of cores is provided on the covering portion. クラッドと、その周囲がそれぞれ当該クラッドに覆われると共に光軸方向に延びる複数のコアと、当該クラッドを覆う被覆部とを備えた２本のマルチコア光ファイバを調芯台に載せ、前記調芯台を操作して、２本の前記マルチコア光ファイバの調芯を行って、２本の前記マルチコア光ファイバを接続するマルチコア光ファイバの接続方法であって、
２本の前記マルチコア光ファイバは、前記複数のコアのうちの特定のコアの位置を識別するための磁性体からなるマーカーを前記被覆部に塗布して形成した認識部が設けられ、
前記マルチコア光ファイバの外周に嵌合し、円周上の特定位置に磁性体アライメントマーカーを有する円筒体の位置調整用治具を準備し、
前記マルチコア光ファイバを前記位置調整用治具に挿入し、前記アライメントマーカーと前記認識部を磁性体の磁力で一致させ、
一致させた状態の前記位置調整用治具を、前記調芯台に載せ、前記アライメントマーカーの円周方向の位置を一致させる
ことを特徴とするマルチコアファイバの相互光接続方法。 Two multi-core optical fibers each having a clad, a plurality of cores each of which is covered by the clad and extending in the optical axis direction, and a covering portion covering the clad, are placed on an aligning stand, and the aligning stand A multi-core optical fiber connection method for aligning two multi-core optical fibers and connecting the two multi-core optical fibers,
The two multi-core optical fibers are provided with a recognition part formed by applying a marker made of a magnetic material for identifying the position of a specific core among the plurality of cores to the covering part,
Fitting to the outer periphery of the multi-core optical fiber, preparing a cylindrical body position adjustment jig having a magnetic alignment marker at a specific position on the circumference,
Insert the multi-core optical fiber into the position adjustment jig, match the alignment marker and the recognition unit by the magnetic force of the magnetic material,
The multi-core fiber mutual optical connection method, wherein the position adjusting jig in a matched state is placed on the alignment table, and the positions of the alignment markers in the circumferential direction are matched. 融着により２本の前記マルチコア光ファイバを接続することを特徴とする請求項２記載のマルチコア光ファイバの接続方法。   3. The method of connecting multi-core optical fibers according to claim 2, wherein the two multi-core optical fibers are connected by fusion bonding. コネクタ加工により、又は、メカニカルスプライサを用いて、２本の前記マルチコア光ファイバを接続することを特徴とする請求項２記載のマルチコア光ファイバの接続方法。
The multi-core optical fiber connection method according to claim 2, wherein the two multi-core optical fibers are connected by connector processing or using a mechanical splicer.
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