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JP2013045018A - Optical fiber ribbon and optical module - Google Patents

Optical fiber ribbon and optical module Download PDF

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JP2013045018A
JP2013045018A JP2011183942A JP2011183942A JP2013045018A JP 2013045018 A JP2013045018 A JP 2013045018A JP 2011183942 A JP2011183942 A JP 2011183942A JP 2011183942 A JP2011183942 A JP 2011183942A JP 2013045018 A JP2013045018 A JP 2013045018A
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optical fiber
optical
fiber ribbon
bending
curved portion
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JP5786558B2 (en
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Takayuki Shimazu
貴之 島津
Atsushi Suzuki
厚 鈴木
Masaki Oyagi
将貴 大谷木
Tomoki Sekiguchi
知樹 関口
Hajime Arao
肇 荒生
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Sumitomo Electric Industries Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an optical fiber ribbon which can ensure flexibility about bending directions while suppressing the reduction of transmission loss due to bending, and an optical module using the same.SOLUTION: In an optical fiber ribbon 11, bend radiuses of optical fibers 12 in a first bend portion 21 and a second bend portion 22 are prescribed by a tape coating part 14 to be able to reduce the transmission loss due to variation of a bending state. Meanwhile, an intermediate portion 23 between the first bend portion 21 and the second bend portion 22 in the optical fiber ribbon 11 is not covered with the tape coating part 14 to expose a plurality of optical fibers 12. Therefore, the optical fiber ribbon 11 can be bent in various directions in a state where bend radiuses of the optical fibers 12 are prescribed, and flexibility about bending directions is ensured to sufficiently secure workability for mounting.

Description

本発明は、光ファイバテープ心線及びこれを用いた光モジュールに関する。   The present invention relates to an optical fiber ribbon and an optical module using the same.

従来の光モジュールとして、例えば特許文献１に記載された光モジュールのように、外部機器と接続可能なコネクタと、複数の光電素子からなる光素子ユニットと、光電素子と光接続される光ファイバケーブルの導入部とを備えたものがある。また、光モジュールに適用される光ファイバテープ心線としては、例えば特許文献２に記載の多心モールド光ファイバがある。この従来の光ファイバでは、並列配置された複数本の光ファイバ素線の全体を樹脂モールドによって一体的に被覆することで、光ファイバ素線の曲げ半径を規定している。   As conventional optical modules, for example, an optical module described in Patent Document 1, a connector that can be connected to an external device, an optical element unit that includes a plurality of photoelectric elements, and an optical fiber cable that is optically connected to the photoelectric elements And an introductory part. Moreover, as an optical fiber tape core wire applied to an optical module, for example, there is a multi-core molded optical fiber described in Patent Document 2. In this conventional optical fiber, a plurality of optical fiber strands arranged in parallel are integrally covered with a resin mold to define the bending radius of the optical fiber strand.

特開２００９−１３３９４０号公報JP 2009-133940 A 特開２００７−２３３１４４号公報JP 2007-233144 A

上述のように、光ファイバテープ心線において、光ファイバ素線の曲げ半径を規定することは、曲げ状態の変動によって生じる伝送損失を低減できる点で有用である。しかしながら、上述した従来の構成のように、並列配置された複数本の光ファイバ素線の全体を樹脂モールドによって一体的に被覆する場合、配列方向と直交する方向に光ファイバテープ心線を屈曲させることは可能であるが、配列方向に光ファイバテープ心線を屈曲させることは困難である。   As described above, in the optical fiber ribbon, defining the bending radius of the optical fiber is useful in that the transmission loss caused by the fluctuation of the bending state can be reduced. However, as in the conventional configuration described above, when a plurality of optical fiber strands arranged in parallel are integrally covered with a resin mold, the optical fiber ribbon is bent in a direction orthogonal to the arrangement direction. Although it is possible, it is difficult to bend the optical fiber ribbon in the arrangement direction.

これは、配列方向に光ファイバテープ心線を屈曲させると、曲げの内側と外側とで光ファイバ素線の曲げ半径が異なり、被覆部内で一部の光ファイバに過剰な応力がかかってしまうためである。光ファイバテープ心線を実装する際には、光ファイバテープ心線が様々な方向に曲げられることが想定されるが、曲げ方向の自由度が制限されると、実装時の作業性が低下することが考えられる。   This is because if the optical fiber ribbon is bent in the arrangement direction, the bend radius of the optical fiber is different between the inside and outside of the bend, and excessive stress is applied to some of the optical fibers within the coating. It is. When mounting the optical fiber ribbon, it is assumed that the optical fiber ribbon is bent in various directions. However, if the flexibility in the bending direction is limited, the workability during mounting is reduced. It is possible.

本発明は、上記課題の解決のためになされたものであり、曲げによる伝送損失の低減を抑えつつ、曲げ方向の自由度を確保できる光ファイバテープ心線、及びこれを用いた光モジュールを提供することを目的とする。   The present invention has been made to solve the above-described problems, and provides an optical fiber ribbon capable of securing a degree of freedom in the bending direction while suppressing a reduction in transmission loss due to bending, and an optical module using the same. The purpose is to do.

上記課題の解決のため、本発明に係る光ファイバテープ心線は、並列配置された複数の光ファイバ素線を樹脂の被覆部によって被覆してなる光ファイバテープ心線であって、複数の光ファイバ素線は、互いに離間して設けられた基端側の第１の湾曲部及び先端側の第２の湾曲部と、第１の湾曲部と第２の湾曲部との間の中間部とを有し、第１の湾曲部と第２の湾曲部とは、被覆部によって覆われており、中間部は、被覆部によって覆われずに複数の光ファイバ素線が露出していることを特徴としている。   In order to solve the above problems, an optical fiber ribbon according to the present invention is an optical fiber ribbon in which a plurality of optical fibers arranged in parallel are covered with a resin coating, The fiber strand includes a first curved portion on the proximal end side and a second curved portion on the distal end side that are provided apart from each other, and an intermediate portion between the first curved portion and the second curved portion. The first bending portion and the second bending portion are covered by the covering portion, and the intermediate portion is not covered by the covering portion, and a plurality of optical fiber strands are exposed. It is a feature.

この光ファイバテープ心線では、並列配置された複数の光ファイバ素線に第１の湾曲部及び第２の湾曲部が設けられており、これらの湾曲部が樹脂の被覆部によって覆われている。したがって、第１の湾曲部及び第２の湾曲部における光ファイバ素線の曲げ半径が被覆部によって規定され、曲げ状態の変動によって生じる伝送損失を低減できる。一方、この光ファイバテープ心線では、第１の湾曲部と第２の湾曲部との間の中間部が被覆部に覆われておらず、複数の光ファイバ素線が露出している。これにより、光ファイバ素線の曲げ半径を規定したままの状態で光ファイバテープ心線を様々な方向に曲げることが可能となり、曲げ方向の自由度の確保によって実装時の作業性を十分に担保できる。   In this optical fiber ribbon, a plurality of optical fiber strands arranged in parallel are provided with a first bending portion and a second bending portion, and these bending portions are covered with a resin coating portion. . Therefore, the bend radius of the optical fiber in the first bent portion and the second bent portion is defined by the covering portion, and transmission loss caused by fluctuation of the bent state can be reduced. On the other hand, in this optical fiber ribbon, the intermediate portion between the first bending portion and the second bending portion is not covered with the covering portion, and a plurality of optical fiber strands are exposed. As a result, it is possible to bend the optical fiber ribbon in various directions with the bending radius of the optical fiber being defined, and sufficiently secure the workability during mounting by ensuring the flexibility in the bending direction. it can.

また、中間部は、直線状となっていることが好ましい。これにより、光ファイバテープ心線を実装する際の位置ずれ誤差を中間部で好適に調整することができる。   Moreover, it is preferable that the intermediate part is linear. Thereby, the position shift error at the time of mounting an optical fiber tape core wire can be suitably adjusted in an intermediate part.

また、第１の湾曲部よりも基端側に第１の直線部を有し、第１の湾曲部と第１の直線部とは、被覆部によって一体的に覆われていることが好ましい。これにより、第１の湾曲部よりも基端側に光コネクタを容易に接続できる。   Moreover, it is preferable to have a 1st linear part in the base end side rather than the 1st curved part, and the 1st curved part and the 1st linear part are integrally covered with the coating | coated part. Thereby, the optical connector can be easily connected to the base end side with respect to the first curved portion.

また、第２の湾曲部よりも先端側に第２の直線部を有し、第２の湾曲部と第２の直線部とは、被覆部によって一体的に覆われていることが好ましい。これにより、第２の湾曲部よりも先端側に光コネクタを容易に接続できる。   Moreover, it is preferable to have a 2nd linear part in the front end side rather than a 2nd curved part, and the 2nd curved part and a 2nd linear part are integrally covered with the coating | coated part. As a result, the optical connector can be easily connected to the distal end side of the second curved portion.

また、複数の光ファイバ素線が所定の本数に分岐する分岐部を有し、被覆部によって覆われた第１の湾曲部及び第２の湾曲部は、分岐部よりも先端側に設けられていることが好ましい。この場合、実装が複雑化して光ファイバテープ心線を曲げる箇所が増加した場合であっても、曲げによる伝送損失の低減を抑えつつ、曲げ方向の自由度を確保できる。   Also, the plurality of optical fiber strands have a branching portion that branches into a predetermined number, and the first bending portion and the second bending portion covered by the covering portion are provided on the distal end side with respect to the branching portion. Preferably it is. In this case, even if the mounting is complicated and the number of places where the optical fiber ribbon is bent is increased, the degree of freedom in the bending direction can be secured while suppressing the reduction in transmission loss due to bending.

また、分岐部よりも手前側では、複数の光ファイバ素線が複数段にわたって並列配置されており、この段数と分岐部における複数の光ファイバ素線の分岐数とが一致していることが好ましい。このような構成により、実装の際に必要な光ファイバテープ心線の曲げ量を予め低減させることができる。   Further, it is preferable that a plurality of optical fiber strands are arranged in parallel over a plurality of stages on the near side of the branch portion, and the number of stages matches the number of branches of the plurality of optical fiber strands in the branch portion. . With such a configuration, the amount of bending of the optical fiber ribbon required for mounting can be reduced in advance.

また、本発明に係る光モジュールは、上記光ファイバテープ心線と光電素子とを基板上に備えてなる光モジュールであって、光ファイバテープ心線の先端と基端とにそれぞれ多心光コネクタが接続され、当該多心光コネクタを介して光電素子と複数の光ファイバ素線とが光結合していることを特徴としている。   An optical module according to the present invention is an optical module comprising the optical fiber tape core and the photoelectric element on a substrate, and a multi-fiber optical connector at each of a front end and a base end of the optical fiber tape. Are connected, and the photoelectric element and the plurality of optical fiber strands are optically coupled through the multi-fiber optical connector.

この光モジュールでは、光ファイバテープ心線において並列配置された複数の光ファイバ素線に第１の湾曲部及び第２の湾曲部が設けられており、これらの湾曲部が樹脂の被覆部によって覆われている。したがって、第１の湾曲部及び第２の湾曲部における光ファイバ素線の曲げ半径が被覆部によって規定され、曲げ状態の変動によって生じる伝送損失を低減できる。一方、光ファイバテープ心線の第１の湾曲部と第２の湾曲部との間の中間部は被覆部に覆われておらず、複数の光ファイバ素線が露出している。これにより、光ファイバ素線の曲げ半径を規定したままの状態で光ファイバテープ心線を様々な方向に曲げることが可能となり、曲げ方向の自由度の確保によって実装時の作業性を十分に担保できる。   In this optical module, a plurality of optical fiber strands arranged in parallel in the optical fiber ribbon are provided with a first bending portion and a second bending portion, and these bending portions are covered with a resin coating portion. It has been broken. Therefore, the bend radius of the optical fiber in the first bent portion and the second bent portion is defined by the covering portion, and transmission loss caused by fluctuation of the bent state can be reduced. On the other hand, an intermediate portion between the first curved portion and the second curved portion of the optical fiber ribbon is not covered with the covering portion, and a plurality of optical fiber strands are exposed. As a result, it is possible to bend the optical fiber ribbon in various directions with the bending radius of the optical fiber being defined, and sufficiently secure the workability during mounting by ensuring the flexibility in the bending direction. it can.

本発明によれば、曲げによる伝送損失の低減を抑えつつ、曲げ方向の自由度を確保できる。   ADVANTAGE OF THE INVENTION According to this invention, the freedom degree of a bending direction is securable, suppressing the reduction of the transmission loss by bending.

本発明に係る光モジュールの一実施形態を示す斜視図である。1 is a perspective view showing an embodiment of an optical module according to the present invention. 図１に示した光モジュールの光結合部分の構成を示す側面図である。It is a side view which shows the structure of the optical coupling part of the optical module shown in FIG. 本発明に係る光ファイバテープ心線の一実施形態を示す斜視図である。It is a perspective view which shows one Embodiment of the optical fiber tape cable core which concerns on this invention. 図３におけるＡ−Ａ線断面図及びＢ−Ｂ線断面図である。It is the sectional view on the AA line in FIG. 3, and the BB sectional view. 図３に示した光ファイバテープ心線の要部を拡大した平面図である。It is the top view to which the principal part of the optical fiber tape core wire shown in FIG. 3 was expanded.

以下、図面を参照しながら、本発明に係る光ファイバテープ心線及び光モジュールの好適な実施形態について詳細に説明する。   Hereinafter, preferred embodiments of an optical fiber ribbon and an optical module according to the present invention will be described in detail with reference to the drawings.

図１は、本発明に係る光モジュールの一実施形態を示す斜視図である。また、図２は、図１に示した光モジュールの光結合部分の構成を示す側面図である。図１及び図２に示すように、光モジュール１は、回路基板２と、発光素子３と、受光素子４と、スペーサ５と、レンズブロック６と、光ファイバテープ心線１１とを備えて構成されている。   FIG. 1 is a perspective view showing an embodiment of an optical module according to the present invention. FIG. 2 is a side view showing the configuration of the optical coupling portion of the optical module shown in FIG. As shown in FIG. 1 and FIG. 2, the optical module 1 includes a circuit board 2, a light emitting element 3, a light receiving element 4, a spacer 5, a lens block 6, and an optical fiber tape core wire 11. Has been.

回路基板２は、例えばフレキシブルプリント基板である。回路基板２の表面には、発光素子３及び受光素子４に接続される配線パターンや、ＩＣチップといった他の電子部品（不図示）等が実装されている。   The circuit board 2 is, for example, a flexible printed board. On the surface of the circuit board 2, a wiring pattern connected to the light emitting element 3 and the light receiving element 4, other electronic components (not shown) such as an IC chip, and the like are mounted.

発光素子３は、例えば例えば垂直共振器面発光レーザ（ＶＣＳＥＬ）などの素子を並列に配置してなる光素子アレイであり、回路基板２の一面側の所定の位置に配置されている。受光素子４は、例えばフォトダイオードなどの素子を並列に配置してなる光素子アレイであり、回路基板２の他面側の所定の位置に配置されている。   The light emitting element 3 is an optical element array in which elements such as vertical cavity surface emitting lasers (VCSEL) are arranged in parallel, for example, and is arranged at a predetermined position on one surface side of the circuit board 2. The light receiving element 4 is an optical element array formed by arranging elements such as photodiodes in parallel, and is arranged at a predetermined position on the other surface side of the circuit board 2.

スペーサ５は、例えばセラミック基板である。スペーサ５は、発光素子３及び受光素子４から離間させてレンズブロック６を配置するための部材であり、回路基板２の一面側及び他面側において発光素子３及び受光素子４を囲うようにそれぞれ配置されている。   The spacer 5 is a ceramic substrate, for example. The spacer 5 is a member for disposing the lens block 6 apart from the light emitting element 3 and the light receiving element 4, and surrounds the light emitting element 3 and the light receiving element 4 on one side and the other side of the circuit board 2, respectively. Is arranged.

レンズブロック６は、入射した光信号を略直角に屈曲させて出射させるガラス製のブロックである。このレンズブロック６は、凸状のレンズ７が並列配置された底面６ａと、レンズ７と同様の凸状のレンズ８が並列配置された側面６ｂと、レンズブロック６内を伝播する光を底面６ａ側或いは側面６ｂ側に反射させる反射面６ｃとを有している。   The lens block 6 is a glass block that bends and emits an incident optical signal at a substantially right angle. The lens block 6 includes a bottom surface 6a in which convex lenses 7 are arranged in parallel, a side surface 6b in which convex lenses 8 similar to the lens 7 are arranged in parallel, and a light that propagates in the lens block 6 on the bottom surface 6a. And a reflection surface 6c that reflects toward the side or the side surface 6b.

このレンズブロック６は、発光素子３の出射面及び受光素子４の受光面と底面６ａのレンズ７とが位置合わされた状態でスペーサ５上に固定されている。また、レンズブロック６の側面６ｂには、後述する多心光コネクタ１３のガイドピンが嵌合する嵌合孔が設けられている。この嵌合孔にガイドピンを嵌合させることにより、多心光コネクタ１３の端面に露出する光ファイバ素線１２の端面と側面６ｂのレンズ８とが位置合わせされた状態で、レンズブロック６と光ファイバテープ心線１１とが固定されている。   The lens block 6 is fixed on the spacer 5 in a state where the emission surface of the light emitting element 3 and the light receiving surface of the light receiving element 4 are aligned with the lens 7 on the bottom surface 6a. Further, the side surface 6b of the lens block 6 is provided with a fitting hole into which a guide pin of a multi-fiber optical connector 13 described later is fitted. By fitting the guide pins into the fitting holes, the end face of the optical fiber 12 exposed on the end face of the multi-fiber optical connector 13 and the lens 8 on the side face 6b are aligned with each other. The optical fiber ribbon 11 is fixed.

このような構成により、発光素子３から出射した光は、底面６ａのレンズ７によってコリメートされ、反射面６ｃで反射した後、側面６ｂのレンズ８によって集光して光ファイバテープ心線１１に入射する。また、光ファイバテープ心線１１から出射した光は、側面６ｂのレンズ８によってコリメートされ、反射面６ｃで反射した後、底面６ａのレンズ７によって集光して受光素子４に入射する。   With such a configuration, the light emitted from the light emitting element 3 is collimated by the lens 7 on the bottom surface 6a, reflected by the reflecting surface 6c, and then condensed by the lens 8 on the side surface 6b and incident on the optical fiber tape core 11. To do. The light emitted from the optical fiber ribbon 11 is collimated by the lens 8 on the side surface 6 b, reflected by the reflecting surface 6 c, condensed by the lens 7 on the bottom surface 6 a, and incident on the light receiving element 4.

続いて、光ファイバテープ心線１１の構成について説明する。   Next, the configuration of the optical fiber ribbon 11 will be described.

図３は、本発明に係る光ファイバテープ心線の一実施形態を示す斜視図である。また、図４は、図３におけるＡ−Ａ線断面図及びＢ−Ｂ線断面図である。同図に示すように、光ファイバテープ心線１１は、並列配置された複数本（ここでは１２本）の光ファイバ素線１２と、光ファイバ素線１２の端部にそれぞれ接続された多心光コネクタ１３と、複数の光ファイバ素線１２を一括して被覆する樹脂製のテープ被覆部１４とを備えている。なお、以下の説明では、便宜上、光モジュール１に接続される端部を先端と称し、その反対側の端部を基端と称する。   FIG. 3 is a perspective view showing an embodiment of the optical fiber ribbon according to the present invention. 4 is a cross-sectional view taken along line AA and a cross-sectional view taken along line BB in FIG. As shown in the figure, the optical fiber ribbon 11 includes a plurality of (in this case, 12) optical fibers 12 arranged in parallel and a multi-core connected to the end of the optical fiber 12 respectively. An optical connector 13 and a resin tape covering portion 14 that collectively covers the plurality of optical fiber wires 12 are provided. In the following description, for convenience, an end connected to the optical module 1 is referred to as a distal end, and an opposite end is referred to as a proximal end.

光ファイバ素線１２は、図４に示すように、コア及びクラッドからなる裸ファイバ１６と、裸ファイバ１６を覆うように紫外線硬化樹脂等で形成された心線被覆部１７とによって構成されている。また、隣り合う光ファイバ素線１２，１２同士は、例えば裸ファイバ１６の半径程度の間隔で互いに離間した状態となっている。   As shown in FIG. 4, the optical fiber 12 includes a bare fiber 16 composed of a core and a clad, and a core wire covering portion 17 formed of an ultraviolet curable resin or the like so as to cover the bare fiber 16. . Moreover, the adjacent optical fiber strands 12 and 12 are in a state of being separated from each other, for example, at an interval of about the radius of the bare fiber 16.

光ファイバテープ心線１１の中間部分には、光ファイバ素線１２が２分岐する分岐部１８が形成されている。分岐部１８よりも基端側の分岐元１８ａでは、図４（ａ）に示すように、６本の光ファイバ素線１２が上下２段に配列されている。これに対し、分岐部１８よりも先端側の各分岐端１８ｂ，１８ｂにおいては、図４（ｂ）に示すように、６本の光ファイバ素線１２がそれぞれ配列されている。   At an intermediate portion of the optical fiber ribbon 11, a branch portion 18 where the optical fiber 12 is branched into two is formed. As shown in FIG. 4A, six optical fiber strands 12 are arranged in two upper and lower stages at the branching source 18 a closer to the base end side than the branching portion 18. On the other hand, as shown in FIG. 4B, six optical fiber strands 12 are arranged at the branch ends 18b and 18b on the tip side of the branch portion 18, respectively.

また、光ファイバ素線１２は、図５に示すように、互いに離間して設けられた基端側の第１の湾曲部２１及び先端側の第２の湾曲部２２と、第１の湾曲部２１と第２の湾曲部２２との間の中間部２３とを有している。第１の湾曲部２１は、各分岐端１８ｂ，１８ｂにおいて分岐部１８にほぼ隣接して形成され、第２の湾曲部２２は、各分岐端１８ｂ，１８ｂにおいて先端側の多心光コネクタ１３の近傍に形成されている。   Further, as shown in FIG. 5, the optical fiber 12 includes a first curved portion 21 on the proximal end side and a second curved portion 22 on the distal end side that are provided apart from each other, and a first curved portion. 21 and an intermediate portion 23 between the second curved portion 22. The first curved portion 21 is formed substantially adjacent to the branched portion 18 at each branch end 18b, 18b, and the second curved portion 22 is formed on the distal end side of the multi-fiber optical connector 13 at each branched end 18b, 18b. It is formed in the vicinity.

また、光ファイバ素線１２は、第１の湾曲部２１よりも基端側に第１の直線部２４を有し、第２の湾曲部２２よりも先端側に第２の直線部２５を有している。第１の直線部２４は、分岐部１８を挟んで第１の湾曲部２１と反対側に位置するように分岐元１８ａに形成され、基端側の端部まで延在している。第２の直線部２５は、各分岐端１８ｂ，１８ｂにおいて第２の湾曲部２２に隣接して形成され、先端側の端部まで延在している。第１の直線部２４及び第２の直線部２５は、例えば１０ｍｍ〜５０ｍｍ程度であることが好ましい。   Further, the optical fiber 12 has a first straight portion 24 on the proximal end side with respect to the first curved portion 21 and a second straight portion 25 on the distal end side with respect to the second curved portion 22. doing. The first straight portion 24 is formed at the branching source 18a so as to be located on the opposite side of the first bending portion 21 with the branching portion 18 interposed therebetween, and extends to the end portion on the proximal end side. The second straight line portion 25 is formed adjacent to the second curved portion 22 at each branch end 18b, 18b, and extends to the end portion on the distal end side. It is preferable that the 1st linear part 24 and the 2nd linear part 25 are about 10 mm-50 mm, for example.

テープ被覆部１４は、例えばシリコーンゴムなどの樹脂によって形成されている。テープ被覆部１４は、光ファイバ素線１２の各部位のうち、第１の湾曲部２１と第１の直線部２４とを分岐部１８を含んで連続的に覆い、また、各分岐端１８ｂ，１８ｂにおいて第２の湾曲部２２と第２の直線部２５とを連続的に覆っている。一方、テープ被覆部１４は、中間部２３には設けられておらず、中間部２３では、光ファイバ素線１２が露出した状態となっている。   The tape covering portion 14 is formed of a resin such as silicone rubber, for example. The tape covering portion 14 continuously covers the first curved portion 21 and the first straight portion 24 including the branch portion 18 among the respective portions of the optical fiber 12, and each branch end 18 b, In 18b, the second curved portion 22 and the second straight portion 25 are continuously covered. On the other hand, the tape covering part 14 is not provided in the intermediate part 23, and the optical fiber 12 is exposed in the intermediate part 23.

なお、テープ被覆部１４を形成する場合には、例えば上述した第１の湾曲部２１、第２の湾曲部２２、第１の直線部２４、第２の直線部２５、中間部、及び分岐部１８の形状に応じた溝を有する金型に光ファイバ素線１２を配列し、溝内に樹脂を流し込むことによって樹脂モールドを行えばよい。   In the case of forming the tape covering portion 14, for example, the first bending portion 21, the second bending portion 22, the first straight portion 24, the second straight portion 25, the intermediate portion, and the branch portion described above. The resin fiber molding may be performed by arranging the optical fiber strands 12 in a mold having a groove corresponding to the shape of 18 and pouring resin into the groove.

以上説明したように、光ファイバテープ心線１１では、並列配置された複数の光ファイバ素線１２に第１の湾曲部２１及び第２の湾曲部２２が設けられており、これらの湾曲部２１，２２が樹脂製のテープ被覆部１４によって覆われている。したがって、第１の湾曲部２１及び第２の湾曲部２２における光ファイバ素線１２の曲げ半径がテープ被覆部１４によって規定され、曲げ状態の変動によって生じる伝送損失を低減できる。   As described above, in the optical fiber ribbon 11, the first bending portion 21 and the second bending portion 22 are provided on the plurality of optical fiber strands 12 arranged in parallel, and these bending portions 21 are provided. , 22 are covered with a resin tape coating 14. Therefore, the bending radius of the optical fiber 12 in the first bending portion 21 and the second bending portion 22 is defined by the tape covering portion 14, and transmission loss caused by fluctuations in the bending state can be reduced.

一方、光ファイバテープ心線１１では、第１の湾曲部２１と第２の湾曲部２２との間の中間部２３がテープ被覆部１４に覆われておらず、複数の光ファイバ素線１２が露出している。これにより、光ファイバ素線１２の曲げ半径を規定したままの状態で光ファイバテープ心線１１を様々な方向に曲げることが可能となり、曲げ方向の自由度の確保によって実装時の作業性を十分に担保できる。また、中間部２３が直線状になっていることで、光ファイバテープ心線１１を回路基板２に実装する際の位置ずれ誤差を中間部２３で好適に調整することができる。   On the other hand, in the optical fiber ribbon 11, the intermediate portion 23 between the first bending portion 21 and the second bending portion 22 is not covered with the tape covering portion 14, and a plurality of optical fiber strands 12 are formed. Exposed. As a result, it becomes possible to bend the optical fiber ribbon 11 in various directions with the bending radius of the optical fiber 12 being defined, and the workability at the time of mounting is sufficiently secured by ensuring the flexibility in the bending direction. Can be secured. Further, since the intermediate portion 23 is linear, a positional deviation error when the optical fiber ribbon 11 is mounted on the circuit board 2 can be suitably adjusted by the intermediate portion 23.

また、光ファイバテープ心線１１では、第１の湾曲部２１よりも基端側の第１の直線部２４がテープ被覆部１４によって第１の湾曲部２１と一体的に覆われ、第２の湾曲部２２よりも先端側の第１の直線部２４がテープ被覆部１４によって第２の湾曲部２２と一体的に覆われている。これにより、光ファイバテープ心線１１の端部に多心光コネクタ１３を容易に接続できる。   Further, in the optical fiber ribbon 11, the first straight portion 24, which is proximal to the first curved portion 21, is integrally covered with the first curved portion 21 by the tape covering portion 14, and the second The first straight portion 24 on the tip side of the bending portion 22 is integrally covered with the second bending portion 22 by the tape covering portion 14. Thereby, the multi-fiber optical connector 13 can be easily connected to the end of the optical fiber ribbon 11.

また、光ファイバテープ心線１１では、複数の光ファイバ素線１２が分岐する分岐部１８を有し、テープ被覆部１４によって覆われた第１の湾曲部２１及び第２の湾曲部２２が分岐部１８よりも先端側に設けられている。また、分岐部１８よりも手前側では、光ファイバ素線１２が複数段にわたって並列配置されており、この段数と分岐部１８における光ファイバ素線１２の分岐数とが一致している。これにより、光モジュール１のように光ファイバテープ心線１１を複数個所で曲げて回路基板２に実装する場合であっても、曲げによる伝送損失の低減を抑えつつ、曲げ方向の自由度を確保できる。また、実装の際に必要な光ファイバテープ心線１１の曲げ量を予め低減させることができる。   Further, the optical fiber ribbon 11 has a branching portion 18 where a plurality of optical fiber strands 12 branch, and the first bending portion 21 and the second bending portion 22 covered with the tape covering portion 14 branch off. It is provided on the tip side from the portion 18. In addition, the optical fiber strands 12 are arranged in parallel over a plurality of stages on the front side of the branching portion 18, and the number of stages coincides with the number of branches of the optical fiber strand 12 in the branching portion 18. As a result, even when the optical fiber ribbon 11 is bent at a plurality of places and mounted on the circuit board 2 as in the optical module 1, the degree of freedom in the bending direction is ensured while suppressing a reduction in transmission loss due to bending. it can. In addition, the amount of bending of the optical fiber ribbon 11 necessary for mounting can be reduced in advance.

１…光モジュール、２…回路基板、３…発光素子、４…受光素子、１１…光ファイバテープ心線、１２…光ファイバ素線、１３…多心光コネクタ、１４…テープ被覆部、１８…分岐部、２１…第１の湾曲部、２２…第２の湾曲部、２３…中間部、２４…第１の直線部、２５…第２の直線部。   DESCRIPTION OF SYMBOLS 1 ... Optical module, 2 ... Circuit board, 3 ... Light emitting element, 4 ... Light receiving element, 11 ... Optical fiber tape core wire, 12 ... Optical fiber strand, 13 ... Multi-fiber optical connector, 14 ... Tape coating | coated part, 18 ... Bifurcation part, 21 ... first bending part, 22 ... second bending part, 23 ... intermediate part, 24 ... first straight part, 25 ... second straight part.

Claims (7)

並列配置された複数の光ファイバ素線を樹脂の被覆部によって被覆してなる光ファイバテープ心線であって、
前記複数の光ファイバ素線は、互いに離間して設けられた基端側の第１の湾曲部及び先端側の第２の湾曲部と、前記第１の湾曲部と前記第２の湾曲部との間の中間部とを有し、
前記第１の湾曲部と前記第２の湾曲部とは、前記被覆部によって覆われており、前記中間部は、前記被覆部によって覆われずに前記複数の光ファイバ素線が露出していることを特徴とする光ファイバテープ心線。 An optical fiber ribbon formed by coating a plurality of optical fiber strands arranged in parallel with a resin coating,
The plurality of optical fiber strands include a first curved portion on the proximal end side and a second curved portion on the distal end side that are provided apart from each other, the first curved portion, and the second curved portion. And an intermediate part between
The first bending portion and the second bending portion are covered with the covering portion, and the intermediate portion is not covered with the covering portion, and the plurality of optical fiber strands are exposed. An optical fiber ribbon characterized by that. 前記中間部は、直線状となっていることを特徴とする請求項１記載の光ファイバテープ心線。   The optical fiber ribbon according to claim 1, wherein the intermediate portion is linear. 前記第１の湾曲部よりも基端側に第１の直線部を有し、
前記第１の湾曲部と前記第１の直線部とは、前記被覆部によって一体的に覆われていることを特徴とする請求項１又は２記載の光ファイバテープ心線。 Having a first straight portion closer to the base end side than the first curved portion;
The optical fiber ribbon according to claim 1 or 2, wherein the first curved portion and the first straight portion are integrally covered with the covering portion. 前記第２の湾曲部よりも先端側に第２の直線部を有し、
前記第２の湾曲部と前記第２の直線部とは、前記被覆部によって一体的に覆われていることを特徴とする請求項１〜３のいずれか一項記載の光ファイバテープ心線。 Having a second straight portion on the tip side of the second curved portion;
The optical fiber tape core wire according to any one of claims 1 to 3, wherein the second curved portion and the second straight portion are integrally covered with the covering portion. 前記複数の光ファイバ素線が所定の本数に分岐する分岐部を有し、
前記被覆部によって覆われた前記第１の湾曲部及び前記第２の湾曲部が前記分岐部よりも先端側に設けられていることを特徴とする請求項１〜４記載の光ファイバテープ心線。 The plurality of optical fiber strands have a branching portion that branches into a predetermined number,
5. The optical fiber ribbon according to claim 1, wherein the first curved portion and the second curved portion covered by the covering portion are provided on the distal end side with respect to the branch portion. . 前記分岐部よりも手前側では、前記複数の光ファイバ素線が複数段にわたって並列配置されており、この段数と前記分岐部における前記複数の光ファイバ素線の分岐数とが一致していることを特徴とする請求項５記載の光ファイバテープ心線。   The plurality of optical fiber strands are arranged in parallel over a plurality of stages on the front side of the branching section, and the number of stages matches the number of branches of the plurality of optical fiber strands in the branching section. The optical fiber ribbon according to claim 5. 請求項１〜６のいずれか一項に記載の光ファイバテープ心線と光電素子とを基板上に備えてなる光モジュールであって、
前記光ファイバテープ心線の先端と基端とにそれぞれ多心光コネクタが接続され、当該多心光コネクタを介して前記光電素子と前記複数の光ファイバ素線とが光結合していることを特徴とする光モジュール。 An optical module comprising the optical fiber tape core according to any one of claims 1 to 6 and a photoelectric element on a substrate,
A multi-fiber optical connector is connected to each of the front end and the base end of the optical fiber ribbon, and the photoelectric element and the plurality of optical fibers are optically coupled via the multi-fiber optical connector. A featured optical module.
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