JP2004117913A - Optical fiber stub, its manufacturing method and optical device using the same - Google Patents

Optical fiber stub, its manufacturing method and optical device using the same Download PDF

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JP2004117913A
JP2004117913A JP2002281916A JP2002281916A JP2004117913A JP 2004117913 A JP2004117913 A JP 2004117913A JP 2002281916 A JP2002281916 A JP 2002281916A JP 2002281916 A JP2002281916 A JP 2002281916A JP 2004117913 A JP2004117913 A JP 2004117913A
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Prior art keywords
optical fiber
optical
fiber stub
reinforcing member
ferrule
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JP4061161B2 (en
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Shunichi Fujita
藤田　俊一
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Kyocera Corp
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Kyocera Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that an optical fiber stub is broken from a notch provided in a ferrule 3 when one end is held and loading is applied on the other end in the optical fiber stub and an optical device S1 using it. <P>SOLUTION: An optical element is mounted on the notch provided in the ferrule 3 having through holes, the optical fiber is held in the through holes in front and rear of the optical element and a reinforcement member 10 is press-inserted and fixed so as to cover the surroundings of the notch. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は光通信に用いる光ファイバスタブ及びその製造方法及びそれを用いた光デバイスに関する。
【０００２】
【従来の技術】
光ファイバスタブ及びそれを用いた光デバイスは、光半導体素子（発光素子または受光素子）及びコネクタとの光接合部品として使用される。光コネクタと接続される面は、ＰＣ研磨されており最適な光結合を得るために光学研磨が施されている。
【０００３】
また、コネクタ接続面側にはシングルモード光ファイバを一定長備えたＦＣコネクタ、ＳＣコネクタ、ＭＵコネクタ、ＬＣコネクタ等が用いられたコネクタを有した構造のものもある。
【０００４】
さらに、一端に光半導体素子を光接続させるためのレンズ部を備えた光ファイバを突出させた構造のものもある。
【０００５】
さらにまた、基体であるフェルールに光アイソレータ、減衰器、フィルタ、レンズ等の光学素子を配設できる少なくとも１つの切り欠きを有するものがある。
【０００６】
図６に上記従来の光ファイバスタブを用いた光デバイスの１例を示す。従来の光ファイバスタブを用いた光デバイスＳ１は、一端に光半導体素子（発光素子または受光素子）を光接続させるためのレンズ部９を備えた第１シングルモード光ファイバ１ａの他端に、第１マルチモード光ファイバ２ａ、コアレス光ファイバ５、第２マルチモード光ファイバ２ｂ、及び第２シングルモード光ファイバ１ｂを順次一列に接続して基体であるフェルール３の貫通孔４に挿入固定して成るとともに、コアレス光ファイバ５に形成した素子搭載用溝７に偏光子１４ａ、１４ｂでファラデー回転子１５を挟むように一体成形後、切断して作製した光アイソレータ６を載置するとともに、光アイソレータ６の偏光子１４ａ、１４ｂの光入出射面とコアレス光ファイバ５の一端部との間に、屈折率をコアレス光ファイバ５に整合させた透光性の屈折率整合接着剤８を設けたものがある。
【０００７】
【発明が解決しようとする課題】
しかしながら、図６に示すような従来の光ファイバスタブ及びそれを用いた光デバイスでは、一端を保持し他端に荷重が印加されるとフェルールに設けた切り欠きから折れてしまう恐れがあった。
【０００８】
【課題を解決するための手段】
上記課題を鑑みて本発明は、貫通孔を有するフェルールに設けた切り欠きに光学素子を載置し、該光学素子の前後の貫通孔に光ファイバを保持するとともに、上記切り欠きの周囲を覆うように補強部材を備えたことを特徴とする。
【０００９】
また、上記補強部材が円筒状であることを特徴とする。
【００１０】
さらに、上記補強部材の少なくとも一部に、切り欠き、凹部、凸部、もしくは孔を設けたことを特徴とする。
【００１１】
また、上記の円筒状の補強部材の内周面に両端面から２つの凸部を有し、材質をステンレスとしたことを特徴とする。
【００１２】
さらに、光ファイバスタブの製造方法において、上記補強部材をフェルールに圧入することにより固定することを特徴とする。
【００１３】
また、光デバイスに上記光ファイバスタブを用いたことを特徴とする。
【００１４】
【発明の実施の形態】
以下、本発明に係る実施の形態について模式的に示した図面に基づき詳細に説明する。なお、各図において同一部材については、同一符号を付し説明を省略するものとする。
【００１５】
図１に本発明の実施形態である光ファイバスタブとこれを用いた光デバイスの断面図を示す。光デバイスＳ２は、基体であるフェルール３の貫通孔４内に、第１シングルモード光ファイバ１ａ、第１マルチモード光ファイバであるＧＩファイバ２ａ、コアを持たないコアレス光ファイバ５、第２マルチモード光ファイバであるＧＩファイバ２ｂ、第２シングルモード光ファイバ１ｂを順次一列に接続した光ファイバ体Ｆを収納してなる。フェルール３から突出したシングルモード光ファイバの一端は、光半導体素子（発光素子または受光素子）と結合するために先球９が加工されており、他端はフェルール３の端面にて研磨加工もしくはシングルモード光ファイバを一定長備えた形の所謂ピグテイル形状としている。
【００１６】
また、フェルール３内で分断されたコアレス光ファイバ５は素子搭載用溝７内に載置した光学素子（例えば光アイソレータ６）を介して光接続させるようにしている。
【００１７】
そして、素子搭載用溝７の周囲を覆うように補強部材１０を備えており、これによって切り欠きを有したフェルール３の抗折強度を容易に強くすることができる。
【００１８】
ここで、円筒状の補強部材１０の形状は図２（ａ）に示すように補強部材１０の外周面に少なくとも１つの環状の凸部を有した形状のもの、図２（ｂ）に示すように光学素子の出し入れが容易に可能となる、円筒状の補強部材１０の外周面に少なくとも１つの切り欠きを有する形状のもの、図２（ｃ）の断面図に示すように封止または整合用の接着剤を注入することが可能となる、円筒状の補強部材１０の一部に少なくとも１つの孔を有するもの、圧入時の摩擦抵抗が少なく挿入性を良くできる図２（ｄ）の断面図に示すように内周面に少なくとも２つ以上の凹部を有した形状又は図２（ｅ）の断面図に示すように内周面に少なくとも１つの凹部又は少なくとも２つの凸部を有した形状のもの、又は図２（ｆ）の断面図に示すように内周面の長手方向に少なくとも３つ以上の凸部、凹部を有したもの、図２（ｇ）の断面図に示すように光モジュールとの嵌合の際、位置決めが容易な外周面の一部に少なくとも１つ以上の凸部を有するもの、又は図２（ｈ）の断面図に示すように外周面の一部に少なくとも１つ以上の凹部を有するものも用いることができる。
【００１９】
また、図３に示すものは、円筒状の補強部材１０の内周面に１つの凹部１０ｂ又は２つの凸部１０ａを有した形状の円筒状の補強部材１０を基体であるフェルール３に圧入固定してある。
【００２０】
本発明で光ファイバスタブ及びそれを用いた光デバイスに使用するフェルール３はジルコニアやアルミナセラミックスの他、ガラス製や樹脂製も使用可能である。円筒状の補強部材１０は円筒スリーブや割スリーブ、複数点支持スリーブが使用可能で、材質はステンレス等の金属の他ジルコニアやアルミナセラミックス等も使用可能である。
【００２１】
また、円筒状の補強部材の厚みは圧入する基体であるフェルール３の外径の３０％以上、長さはフェルール３の全長の３０％以上が好ましい。
【００２２】
次に本発明の光ファイバスタブ及びそれを用いた光デバイスの製造方法を説明する。光デバイスＳ２は、図４に示すように圧入用固定具１１の中心にある貫通孔へ図３に示す外径３．５ｍｍ、長さ１２．１ｍｍ、内径２．５１ｍｍの内周面には両端面から長さが２ｍｍの環状の凸部１０ａを２つ有したステンレスの円筒状の補強部材１０を挿入し、その上から圧入用ガイド１２を被せ圧入用ガイドの中心にある貫通孔へ基体である直径２．４９９ｍｍ、長さ３１ｍｍのジルコニアフェルール３を挿入し、ハンドプレスを用いてフェルール３を円筒状の補強部材１０に挿入固定した。
【００２３】
ここで、円筒状の補強部材１０を上記形状としたのは、従来の光ファイバスタブ及びそれを用いた光デバイスＳ１の基体であるフェルール３の形状が円筒状であり、補強部材１０を円筒状とすることで光モジュールと勘合する部分の径を大きくするだけで容易に設計変更が出来る。
【００２４】
また、円筒状の補強部材の内周面に長さ２ｍｍの環状の２つの凸部１０ａを有したことで、基体であるフェルール３は長さ２ｍｍの２つの環状の凸部１０ａで把持されるため合計長さ４ｍｍと接触するだけとなり、長さ１２．１ｍｍと非常に長い円筒状の補強部材１０を容易に圧入固定することができる。
【００２５】
さらに、材質をステンレスとすれば光モジュールと補強部材１０とをレーザー溶接することが可能となる。レーザー溶接は半田封止よりさらに簡便で短時間の工程であり、また、熱も局所的にしか発生しないため、光デバイスに内蔵されている光学素子やレーザーモジュール内の半導体素子に与える影響が少ない。
【００２６】
これに第１シングルモード光ファイバ１ａ、第１マルチモード光ファイバであるＧＩファイバ２ａ、コアを持たないコアレス光ファイバ５、第２マルチモード光ファイバであるＧＩファイバ２ｂ、第２シングルモード光ファイバ１ｂを順次一列に放電加工により融着接続し、最後に第１シングルモード光ファイバ１ａの一端に研磨加工により先球９を形成した光ファイバ体Ｆをフェルール３の貫通孔４に挿入固定する。固定には接着剤を用いたが、気密性を高めるため、低融点ガラスや半田を用いても良い。他端はフェルール３の端面にて研磨加工もしくはシングルモード光ファイバを一定長備えた形の所謂ピグテイル形状としている。さらにコアレス光ファイバ５の部分で貫通孔４を横切るように幅１ｍｍの素子搭載用溝７を形成し、そこに偏光子１４ａ、１４ｂでファラデー回転子１５を挟むように一体成形後、切断して作製した光アイソレータ６を載置した。ここで、コアレス光ファイバ５と屈折率を整合させた紫外線硬化型接着剤や熱硬化型の接着剤８を用いて光アイソレータ６とコアレス光ファイバ５の間に充填接着し光デバイスＳ２を構成した。
【００２７】
図示はしていないが、図１の光デバイスＳ２のレンズ部９を備えた第１シングルモード光ファイバ１Ａ側には、不図示の光半導体素子（発光素子または受光素子）を搭載したモジュールが光接続され信号光を伝送できるようになっている。コネクタとの低接続損失を維持するために光デバイスＳ２のコネクタ接続面はＰＣ研磨や、加工変質層を除去したＰＣ研磨、またはシングルモード光ファイバを一定長備えたＦＣコネクタ、ＳＣコネクタ、ＭＵコネクタ、ＬＣコネクタ等が用いられたコネクタを有した構造のものもある。素子搭載用溝７には光アイソレータ６の他に、減衰機、フィルタ、レンズ等の光学素子を配設したものがある。
【００２８】
【実施例】
ここで、本発明における光ファイバ用スタブを用いた光デバイスと従来の光ファイバスタブを用いた光デバイスの抗折強度の比較を行った。
【００２９】
図５に本発明の光ファイバスタブを用いた光デバイスＳ２と図示しない従来の光ファイバスタブを用いた光デバイスＳ１の抗折強度測定方法を模式的に示した。光デバイスＳ２の一端を強固に保持し、他端の端面から素子搭載用溝方向へ２ｍｍの位置にプッシュプルゲージ１３によって上方から基体であるフェルール３へ荷重を加え、光デバイスＳ２が折れるまでの荷重をプッシュプルゲージ１３で測定し抗折強度を測定した。
【００３０】
また、光デバイスＳ１においても同じ方法で測定した。
【００３１】
【表１】

Figure 2004117913
【００３２】
表１は上記本発明の光ファイバスタブを用いた光デバイスＳ２と従来の光ファイバスタブを用いた光デバイスＳ１の抗折強度を比較した表である。従来の光ファイバスタブを用いた光デバイスＳ１では抗折強度平均値が２７８．５ｋｇｆ／ｍｍ２に対し、本発明の光ファイバスタブを用いた光デバイスＳ２では抗折強度平均値が９０４．５ｋｇｆ／ｍｍ２と３．２倍抗折強度が強くなる。
【００３３】
【発明の効果】
以上のように本発明によれば、フェルールに設けた切り欠きに光学素子を載置し、この切り欠きの周囲を覆うように円筒状の補強部材を備えたことにより、作製容易で抗折強度が大幅に強い光ファイバスタブ及びそれを用いた光デバイスを提供することができる。
【図面の簡単な説明】
【図１】本発明の光ファイバスタブを示す断面図である。
【図２】（ａ）〜（ｈ）は本発明の光ファイバスタブに用いる円筒状の補強部材のさまざまな形状を示す図である。
【図３】本発明の光ファイバスタブに用いる補強部材を示す断面図である。
【図４】本発明の光ファイバスタブの製造方法を示す断面図である。
【図５】本発明の光ファイバスタブの抗折強度測定方法を示す断面図である。
【図６】従来の光ファイバスタブを示す断面図である。
【符号の説明】
１ａ、１ｂ：シングルモード光ファイバ
２ａ、２ｂ：マルチモード光ファイバ
３：フェルール（基体）
４：貫通孔
５：コアレス光ファイバ
６：光アイソレータ
７：素子搭載用溝
８：屈折率整合接着剤
９：先球（レンズ部）
１０、１０ａ、１０ｂ：円筒状部材（補強用部材）
１１：圧入用固定具
１２：圧入用ガイド
１３：プッシュプルゲージ
１４ａ、１４ｂ：偏光子
１５：ファラデー回転子
Ｆ：光ファイバ体
Ｓ１、Ｓ２：光デバイス[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an optical fiber stub used for optical communication, a method for manufacturing the same, and an optical device using the same.
[0002]
[Prior art]
BACKGROUND ART An optical fiber stub and an optical device using the same are used as an optical bonding part with an optical semiconductor element (light emitting element or light receiving element) and a connector. The surface to be connected to the optical connector is PC-polished and optically polished to obtain optimal optical coupling.
[0003]
Further, there is also a structure having a connector using a FC connector, an SC connector, an MU connector, an LC connector, or the like having a fixed length of a single mode optical fiber on the connector connection surface side.
[0004]
Further, there is also a structure in which an optical fiber having a lens portion for optically connecting an optical semiconductor element to one end is projected.
[0005]
Still further, some ferrules have at least one notch in which an optical element such as an optical isolator, an attenuator, a filter, and a lens can be disposed.
[0006]
FIG. 6 shows an example of an optical device using the above-mentioned conventional optical fiber stub. An optical device S1 using a conventional optical fiber stub includes a first single mode optical fiber 1a having a lens portion 9 for optically connecting an optical semiconductor element (light emitting element or light receiving element) at one end. The multi-mode optical fiber 2a, the coreless optical fiber 5, the second multi-mode optical fiber 2b, and the second single-mode optical fiber 1b are sequentially connected in a line and inserted and fixed in the through hole 4 of the ferrule 3 as a base. At the same time, the optical isolator 6 formed by integrally molding the element mounting groove 7 formed in the coreless optical fiber 5 with the polarizers 14a and 14b so as to sandwich the Faraday rotator 15 and then cutting the optical isolator 6 is placed. Between the light entrance / exit surfaces of the polarizers 14a and 14b and one end of the coreless optical fiber 5 so as to match the refractive index with the coreless optical fiber 5. There is provided an index matching adhesive 8 of the translucent.
[0007]
[Problems to be solved by the invention]
However, in a conventional optical fiber stub and an optical device using the same as shown in FIG. 6, when a load is applied to one end and a load is applied to the other end, there is a possibility that the ferrule may break from a cutout provided in the ferrule.
[0008]
[Means for Solving the Problems]
In view of the above problems, the present invention places an optical element in a notch provided in a ferrule having a through hole, holds an optical fiber in through holes before and after the optical element, and covers the periphery of the notch. Thus, a reinforcing member is provided.
[0009]
Further, the reinforcing member has a cylindrical shape.
[0010]
Further, a cutout, a concave portion, a convex portion, or a hole is provided in at least a part of the reinforcing member.
[0011]
Further, the cylindrical reinforcing member has two convex portions from both end surfaces on an inner peripheral surface thereof, and is made of stainless steel.
[0012]
Furthermore, in the method for manufacturing an optical fiber stub, the reinforcing member is fixed by being pressed into a ferrule.
[0013]
Further, the optical fiber stub is used for an optical device.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings schematically showing the embodiments. In the drawings, the same members are denoted by the same reference numerals and description thereof will be omitted.
[0015]
FIG. 1 shows a sectional view of an optical fiber stub according to an embodiment of the present invention and an optical device using the same. The optical device S2 includes a first single-mode optical fiber 1a, a GI fiber 2a as a first multi-mode optical fiber, a coreless optical fiber 5 having no core, a second multi-mode optical fiber in a through hole 4 of a ferrule 3 as a base. An optical fiber body F in which a GI fiber 2b and a second single mode optical fiber 1b, which are optical fibers, are sequentially connected in a line is housed. One end of the single mode optical fiber protruding from the ferrule 3 is formed with a spherical tip 9 for coupling with an optical semiconductor element (light emitting element or light receiving element), and the other end is polished or single-ended on the end face of the ferrule 3. It has a so-called pigtail shape having a mode optical fiber with a fixed length.
[0016]
Further, the coreless optical fiber 5 split in the ferrule 3 is optically connected via an optical element (for example, an optical isolator 6) mounted in the element mounting groove 7.
[0017]
The reinforcing member 10 is provided so as to cover the periphery of the element mounting groove 7, whereby the bending strength of the ferrule 3 having the notch can be easily increased.
[0018]
Here, the shape of the cylindrical reinforcing member 10 is a shape having at least one annular protrusion on the outer peripheral surface of the reinforcing member 10 as shown in FIG. 2A, and as shown in FIG. A cylindrical reinforcing member 10 having at least one notch on its outer peripheral surface, which allows easy insertion and removal of an optical element, for sealing or alignment as shown in the sectional view of FIG. 2 (d), which has at least one hole in a part of the cylindrical reinforcing member 10 capable of injecting the adhesive of FIG. As shown in FIG. 2, a shape having at least two or more concave portions on the inner peripheral surface or a shape having at least one concave portion or at least two convex portions on the inner peripheral surface as shown in the sectional view of FIG. Or the inner peripheral surface as shown in the cross-sectional view of FIG. One having at least three convex portions and concave portions in the hand direction, as shown in the cross-sectional view of FIG. One having one or more protrusions, or one having at least one or more recesses in a part of the outer peripheral surface as shown in the cross-sectional view of FIG.
[0019]
3 shows a cylindrical reinforcing member 10 having one concave portion 10b or two convex portions 10a formed on the inner peripheral surface of the cylindrical reinforcing member 10 by press-fitting and fixing the ferrule 3 as a base. I have.
[0020]
The ferrule 3 used for the optical fiber stub and the optical device using the same in the present invention can be made of glass or resin besides zirconia or alumina ceramics. As the cylindrical reinforcing member 10, a cylindrical sleeve, a split sleeve, and a multi-point support sleeve can be used. As a material, zirconia, alumina ceramics, or the like can be used in addition to metal such as stainless steel.
[0021]
Further, the thickness of the cylindrical reinforcing member is preferably 30% or more of the outer diameter of the ferrule 3 which is a base to be press-fitted, and the length thereof is preferably 30% or more of the entire length of the ferrule 3.
[0022]
Next, an optical fiber stub of the present invention and a method for manufacturing an optical device using the same will be described. The optical device S2 is inserted into a through hole at the center of the press-fitting fixture 11 as shown in FIG. 4 and has both ends on an inner peripheral surface having an outer diameter of 3.5 mm, a length of 12.1 mm, and an inner diameter of 2.51 mm shown in FIG. A stainless steel cylindrical reinforcing member 10 having two annular convex portions 10a having a length of 2 mm from the surface is inserted, and a press-fitting guide 12 is placed thereon, and the base is inserted into a through hole at the center of the press-fitting guide. A zirconia ferrule 3 having a diameter of 2.499 mm and a length of 31 mm was inserted, and the ferrule 3 was inserted and fixed to the cylindrical reinforcing member 10 using a hand press.
[0023]
Here, the reason why the cylindrical reinforcing member 10 has the above-mentioned shape is that the ferrule 3 which is the base of the conventional optical fiber stub and the optical device S1 using the same is cylindrical, and the reinforcing member 10 is cylindrical. By doing so, the design can be easily changed simply by increasing the diameter of the portion to be fitted to the optical module.
[0024]
Further, since the inner peripheral surface of the cylindrical reinforcing member has two annular convex portions 10a having a length of 2 mm, the ferrule 3 as a base is gripped by the two annular convex portions 10a having a length of 2 mm. Therefore, only a total length of 4 mm is brought into contact, and the cylindrical reinforcing member 10 having a very long length of 12.1 mm can be easily press-fitted and fixed.
[0025]
Furthermore, if the material is made of stainless steel, the optical module and the reinforcing member 10 can be laser-welded. Laser welding is a simpler and shorter process than solder sealing, and generates heat only locally, so it has little effect on optical elements built into optical devices and semiconductor elements in laser modules. .
[0026]
A first single mode optical fiber 1a, a GI fiber 2a as a first multimode optical fiber, a coreless optical fiber 5 having no core, a GI fiber 2b as a second multimode optical fiber, and a second single mode optical fiber 1b Are sequentially fused in a line by electric discharge machining, and finally, an optical fiber body F in which one end of the first single mode optical fiber 1 a is formed with a tip ball 9 by polishing is inserted and fixed in the through hole 4 of the ferrule 3. Although an adhesive was used for fixing, low-melting glass or solder may be used to improve airtightness. The other end is a so-called pigtail shape in which the end surface of the ferrule 3 is polished or provided with a single mode optical fiber for a fixed length. Further, an element mounting groove 7 having a width of 1 mm is formed so as to cross the through-hole 4 at the portion of the coreless optical fiber 5, and is integrally formed therewith so as to sandwich the Faraday rotator 15 between the polarizers 14a and 14b, and then cut. The produced optical isolator 6 was placed. Here, the optical device S2 was formed by filling and bonding between the optical isolator 6 and the coreless optical fiber 5 using an ultraviolet-curing adhesive or a thermosetting adhesive 8 whose refractive index was matched with that of the coreless optical fiber 5. .
[0027]
Although not shown, a module equipped with an optical semiconductor element (light emitting element or light receiving element) (not shown) is mounted on the side of the first single mode optical fiber 1A provided with the lens unit 9 of the optical device S2 in FIG. It is connected so that signal light can be transmitted. In order to maintain a low connection loss with the connector, the connector connection surface of the optical device S2 is PC-polished, PC-polished from which a work-affected layer is removed, or an FC connector, SC connector, or MU connector having a fixed length of a single-mode optical fiber. , An LC connector or the like. Some of the element mounting grooves 7 include optical elements such as an attenuator, a filter, and a lens, in addition to the optical isolator 6.
[0028]
【Example】
Here, the bending strength of the optical device using the optical fiber stub according to the present invention and the conventional optical device using the optical fiber stub were compared.
[0029]
FIG. 5 schematically shows a bending strength measuring method for an optical device S2 using an optical fiber stub of the present invention and an optical device S1 using a conventional optical fiber stub (not shown). One end of the optical device S2 is firmly held, and a load is applied to the ferrule 3 as a base from above by a push-pull gauge 13 at a position of 2 mm from the end surface of the other end in the element mounting groove direction until the optical device S2 breaks. The load was measured with the push-pull gauge 13 to measure the bending strength.
[0030]
The measurement was also performed on the optical device S1 in the same manner.
[0031]
[Table 1]
Figure 2004117913
[0032]
Table 1 is a table comparing the bending strength of the optical device S2 using the optical fiber stub of the present invention and the optical device S1 using the conventional optical fiber stub. In the optical device S1 using the conventional optical fiber stub, the average bending strength is 278.5 kgf / mm 2, whereas in the optical device S2 using the optical fiber stub of the present invention, the average bending strength is 904.5 kgf / mm. mm 2 and 3.2 times the flexural strength becomes stronger.
[0033]
【The invention's effect】
As described above, according to the present invention, the optical element is placed in the notch provided in the ferrule, and the cylindrical reinforcing member is provided so as to cover the periphery of the notch. Can be provided, and an optical device using the same can be provided.
[Brief description of the drawings]
FIG. 1 is a sectional view showing an optical fiber stub of the present invention.
FIGS. 2A to 2H are diagrams showing various shapes of a cylindrical reinforcing member used for the optical fiber stub of the present invention.
FIG. 3 is a sectional view showing a reinforcing member used for the optical fiber stub of the present invention.
FIG. 4 is a cross-sectional view illustrating a method for manufacturing an optical fiber stub of the present invention.
FIG. 5 is a cross-sectional view showing a bending strength measuring method of the optical fiber stub of the present invention.
FIG. 6 is a sectional view showing a conventional optical fiber stub.
[Explanation of symbols]
1a, 1b: single mode optical fiber 2a, 2b: multimode optical fiber 3: ferrule (base)
4: Through hole 5: Coreless optical fiber 6: Optical isolator 7: Element mounting groove 8: Refractive index matching adhesive 9: Tip sphere (lens part)
10, 10a, 10b: cylindrical member (reinforcing member)
11: Press-fitting fixture 12: Press-fit guide 13: Push-pull gauges 14a, 14b: Polarizer 15: Faraday rotator F: Optical fiber body S1, S2: Optical device

Claims (6)

貫通孔を有するフェルールに設けた切り欠きに光学素子を載置し、該光学素子の前後の貫通孔に光ファイバを保持するとともに、上記切り欠きの周囲を覆うように補強部材を備えたことを特徴とする光ファイバスタブ。An optical element is placed in a notch provided in a ferrule having a through hole, an optical fiber is held in through holes before and after the optical element, and a reinforcing member is provided so as to cover the periphery of the notch. Characteristic optical fiber stub. 上記補強部材が円筒状であることを特徴とする請求項１記載の光ファイバスタブ。The optical fiber stub according to claim 1, wherein the reinforcing member is cylindrical. 上記補強部材の少なくとも一部に、切り欠き、凹部、凸部、もしくは孔を設けたことを特徴とする請求項１又は２記載の光ファイバスタブ。The optical fiber stub according to claim 1, wherein a cutout, a concave portion, a convex portion, or a hole is provided in at least a part of the reinforcing member. 上記の円筒状の補強部材の内周面に両端面から２つの凸部を有し、材質をステンレスとしたことを特徴とする請求項１〜３記載の光ファイバスタブ。The optical fiber stub according to claim 1, wherein the cylindrical reinforcing member has two convex portions on the inner peripheral surface from both end surfaces, and is made of stainless steel. 請求項１〜４のいずれかに記載の光ファイバスタブの製造方法において、上記補強部材をフェルールに圧入することにより固定することを特徴とする光ファイバスタブの製造方法。The method for manufacturing an optical fiber stub according to any one of claims 1 to 4, wherein the reinforcing member is fixed by press-fitting the ferrule into a ferrule. 請求項１〜４のいずれかに記載の光ファイバスタブを用いたことを特徴とする光デバイス。An optical device using the optical fiber stub according to claim 1.
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US7251394B2 (en) * 2004-06-29 2007-07-31 Kyocera Corporation Optical isolator with tilted optical isolator element
CN103940455A (en) * 2014-04-10 2014-07-23 华中科技大学 All-fiber high accuracy sensor based on optical fiber multi-mode interference and application thereof
JP2019207353A (en) * 2018-05-30 2019-12-05 京セラ株式会社 Receptacle with isolator and optical device

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