JPH06324229A - Production of optical fiber coupler - Google Patents

Production of optical fiber coupler

Info

Publication number
JPH06324229A
JPH06324229A JP11157093A JP11157093A JPH06324229A JP H06324229 A JPH06324229 A JP H06324229A JP 11157093 A JP11157093 A JP 11157093A JP 11157093 A JP11157093 A JP 11157093A JP H06324229 A JPH06324229 A JP H06324229A
Authority
JP
Japan
Prior art keywords
adhesive
optical fiber
optical
optical fibers
fused
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP11157093A
Other languages
Japanese (ja)
Other versions
JP3161866B2 (en
Inventor
Atsushi Abe
淳 阿部
Kazuo Kamiya
和雄 神屋
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shin Etsu Chemical Co Ltd
Original Assignee
Shin Etsu Chemical Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shin Etsu Chemical Co Ltd filed Critical Shin Etsu Chemical Co Ltd
Priority to JP11157093A priority Critical patent/JP3161866B2/en
Publication of JPH06324229A publication Critical patent/JPH06324229A/en
Application granted granted Critical
Publication of JP3161866B2 publication Critical patent/JP3161866B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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  • Mechanical Coupling Of Light Guides (AREA)

Abstract

PURPOSE:To suppress the fluctuation of branching ratios and the characteristics of excess loss and to suppress the fluctuation in characteristics after thermal impact test by adhering the front and rear of an optical coupling part to protective members by an adhesive having a prescribed viscosity. CONSTITUTION:Screw rods and guide rods are removed from the chassis of the device while the fused and stretched fibers of optical fibers 1, 2 are held butted in clamps. The fused and stretched fibers are held between two sheets of the protective members 17 which are quartz plate. The front and rear of the optical coupling part 11 are then adhered by the adhesive 16 of an epoxy resin of a UV curing type (one pack type or two pack type). The fused and stretched fibers of two pieces of the optical fibers 1, 2 are adhered and fixed by using the adhesive 16 having 1000 to 50000cps viscosity at 20 deg.C. The clamps are removed and the clamps, screw rods, guide rods, etc., which are tentative jigs are removed. Further, the fused and stretched fibers of the optical fibers 1, 2 are housed into a protective case 14. The protective members 17 and the protective case 14 are adhered and fixed to each other by the adhesive 20. Both ends of the protect case 14 are solidified and hermetically sealed by the adhesive 20.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は光通信や光センサなどに
利用される光ファイバカプラの製造方法に関するもので
ある。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing an optical fiber coupler used for optical communication and optical sensors.

【0002】[0002]

【従来の技術】光ファイバ通信システムでは、光を分
岐、結合あるいは分波、合波するための重要な要素部品
として光ファイバカプラが使用される。特に光ファイバ
を加工して得られた光ファイバカプラは光ファイバとの
結合性に優れ、通過光の損失が低いため、多くの分野で
使用されている。
2. Description of the Related Art In an optical fiber communication system, an optical fiber coupler is used as an important component for branching, coupling, demultiplexing, and multiplexing light. In particular, an optical fiber coupler obtained by processing an optical fiber has excellent coupling properties with the optical fiber and has a low loss of passing light, and is therefore used in many fields.

【0003】光ファイバカプラは、複数の単一モードの
光ファイバが束ねられ、その一部分が融着延伸されて光
結合部分が形成され、複数の光ファイバのうち1の光フ
ァイバに入射した光が他の光ファイバに一定分岐比で分
岐する。
In an optical fiber coupler, a plurality of single-mode optical fibers are bundled, and a part of them is fused and stretched to form an optical coupling portion. Light incident on one of the plurality of optical fibers is It branches to another optical fiber at a constant branching ratio.

【0004】図2は光ファイバカプラを製造する方法の
要部を示した図である。光ファイバ1および2は、融着
すべき部分について保護被覆材3を予め除去し、それぞ
れクランプ4および5で互いに接触する状態で固定す
る。クランプ4および5は、ねじ棒22とガイド棒23
および駆動モータMからなる引っ張り機構に連結してい
る。光ファイバ1および2の接触部分を酸水素炎6で加
熱して2本の光ファイバ1および2を融着させる。ここ
で駆動モータMを回転させると、クランプ4および5が
矢示方向に移動し、光ファイバ1および2は軸方向に引
き伸ばされてテーパ状の光結合部分11が形成される。
この際、光源7から光ファイバ1に所定の波長の光を入
射させ、光ファイバ1からの出力光量を光検出器8で検
出し、光ファイバ2からの出力光量を光検出器9で検出
して分岐比を検知しながら延伸し、所望の分岐比になっ
たときに駆動モータMを停止して延伸を止める。前記の
ようにして得られた光ファイバ1および2の融着延伸物
は、テーパ状の光結合部分11が極めて細く、機械強度が
低くなっているため、僅かな外力により軸がずれ、光の
分岐比などが変化して動作特性が不安定になってしま
う。このため、光ファイバ1および2の融着延伸物を保
護部材に接着収納し、外部応力が加わらないようにす
る。
FIG. 2 is a diagram showing an essential part of a method for manufacturing an optical fiber coupler. In the optical fibers 1 and 2, the protective coating material 3 is previously removed from the portions to be fused, and the optical fibers 1 and 2 are fixed in contact with each other by the clamps 4 and 5, respectively. The clamps 4 and 5 include a screw rod 22 and a guide rod 23.
And a pulling mechanism composed of a drive motor M. The contact portions of the optical fibers 1 and 2 are heated by the oxyhydrogen flame 6 to fuse the two optical fibers 1 and 2. When the drive motor M is rotated here, the clamps 4 and 5 move in the direction of the arrow, and the optical fibers 1 and 2 are stretched in the axial direction to form the tapered optical coupling portion 11.
At this time, light of a predetermined wavelength is made incident on the optical fiber 1 from the light source 7, the output light amount from the optical fiber 1 is detected by the photodetector 8, and the output light amount from the optical fiber 2 is detected by the photodetector 9. The stretching is stopped while detecting the branching ratio, and when the desired branching ratio is reached, the drive motor M is stopped to stop the stretching. The fusion-stretched drawn products of the optical fibers 1 and 2 obtained as described above have a tapered optical coupling portion 11 which is extremely thin and has a low mechanical strength. The branching ratio changes and the operating characteristics become unstable. For this reason, the fusion-stretched drawn products of the optical fibers 1 and 2 are adhesively housed in the protective member so that external stress is not applied.

【0005】このようにして製造された光ファイバカプ
ラは、保護部材への接着収納によって特性が低下しない
ものでなければならない。特性の安定を図るため、特開
平3-107111号公報には、接着剤のヤング率を特定の範囲
に限定し、光ファイバ1および2の融着延伸物を固定し
て光ファイバカプラを製造する方法が開示されている。
また特開平3-168709号公報には、高耐熱性かつ低い熱膨
張係数を有する接着剤で光ファイバ1および2の融着延
伸物を固定して光ファイバカプラを製造する方法が開示
されている。
The optical fiber coupler manufactured in this manner must be one whose characteristics do not deteriorate due to storage in the protective member. In order to stabilize the characteristics, in Japanese Patent Laid-Open No. 3-107111, the Young's modulus of the adhesive is limited to a specific range, and the fused drawn products of the optical fibers 1 and 2 are fixed to manufacture an optical fiber coupler. A method is disclosed.
Further, Japanese Patent Application Laid-Open No. 3-168709 discloses a method for manufacturing an optical fiber coupler by fixing the fusion-stretched drawn products of the optical fibers 1 and 2 with an adhesive having high heat resistance and a low thermal expansion coefficient. .

【0006】[0006]

【発明が解決しようとする課題】しかしながら、これら
公報に記載の方法であっても、光ファイバ1および2の
融着延伸物を保護部材に接着収納した後に、光ファイバ
カプラの過剰損失が増大することを抑えることができな
かった。そのために製品の歩留りが悪くなっていた。
However, even in the methods described in these publications, the excess loss of the optical fiber coupler increases after the fusion-stretched drawn products of the optical fibers 1 and 2 are bonded and stored in the protective member. I couldn't hold back. As a result, the yield of products has deteriorated.

【0007】本発明は前記の課題を解決するためなされ
たもので、光ファイバ1および2の融着延伸物を保護部
材に接着収納しても、特性が低下することのない光ファ
イバカプラの製造方法を提供することを目的とする。
The present invention has been made in order to solve the above-mentioned problems, and manufactures an optical fiber coupler in which the characteristics do not deteriorate even when the fused and drawn products of the optical fibers 1 and 2 are accommodated in a protective member. The purpose is to provide a method.

【0008】[0008]

【課題を解決するための手段】前記の目的を達成するた
めになされた本発明の光ファイバカプラの製造方法は、
図1および図2に示すように複数の光ファイバ1および
2を束ね、その一部分を加熱しながら融着延伸して光結
合させてから、保護部材17に接着収納する光ファイバカ
プラの製造方法において、光結合部11の前後を20℃で
の粘度が1000〜50000 cpsの接着剤16で保護部材1
7に接着することを特徴とする。
The method for manufacturing an optical fiber coupler according to the present invention, which has been made to achieve the above object, comprises:
As shown in FIGS. 1 and 2, a plurality of optical fibers 1 and 2 are bundled, and a part of the optical fibers is fused and stretched while being heated to be optically coupled, and then bonded to a protective member 17 to be housed in an optical fiber coupler. , The protective member 1 before and after the optical coupling portion 11 with an adhesive 16 having a viscosity of 1000 to 50,000 cps at 20 ° C.
It is characterized in that it is bonded to 7.

【0009】[0009]

【作用】光ファイバカプラは、加熱溶融延伸し光結合さ
せた後、光結合部11の前後を保護部材17に接着収納
する。その際、粘度が1000〜50000 cpsの接着剤16
を使用するので、接着収納する事前、事後において、分
岐比および過剰損失の特性に変動がほとんどない光ファ
イバカプラとなる。また接着強度も十分なものとなる。
After the optical fiber coupler is heated, melted, drawn and optically coupled, the front and rear of the optical coupling portion 11 are adhesively housed in the protective member 17. At that time, the adhesive 16 having a viscosity of 1000 to 50,000 cps
Since the optical fiber coupler is used, the optical fiber coupler has almost no fluctuation in the characteristics of the branching ratio and the excess loss before and after the adhesive housing. Also, the adhesive strength becomes sufficient.

【0010】接着剤16の粘度が1000cps以下である
と、接着剤16は浸透しやすいが、光ファイバ1および
2の会合面に毛細管現象で浸透し過ぎ、光結合部11の
前後を確実に固定できるだけ十分な量が必要箇所に残ら
なくなってしまい、接着強度が不足してしまう。また接
着剤16が光結合部11にまで流れてしまい、硬化する
までの間に生じる応力によって光ファイバ1および2の
融着延伸物が変形を受け、分岐比が変動してしまう。接
着剤16の粘度が50000 cps以上であると、接着剤1
6の接着面への浸透が不十分で塗布が不均一となり、ま
た硬化時に光結合部11にかかる応力が不均一になり、
光ファイバ1および2の融着延伸物が変形を受け、分岐
比が変動してしまう。また接着剤16の浸透が不足で接
着強度が足りなくなってしまう。
When the viscosity of the adhesive 16 is 1000 cps or less, the adhesive 16 easily penetrates, but the adhesive 16 penetrates too much into the mating surface of the optical fibers 1 and 2 by a capillary phenomenon, so that the front and rear of the optical coupling portion 11 are securely fixed. The adhesive strength will be insufficient because the sufficient amount will not remain in the necessary places. Further, the adhesive 16 flows to the optical coupling portion 11, and the fusion stretched products of the optical fibers 1 and 2 are deformed by the stress generated until the adhesive 16 is cured, and the branching ratio fluctuates. If the viscosity of the adhesive 16 is 50,000 cps or more, the adhesive 1
Insufficient penetration into the adhesive surface of 6 makes the coating uneven, and the stress applied to the optical coupling portion 11 at the time of curing becomes uneven,
The fusion-stretched drawn products of the optical fibers 1 and 2 are deformed, and the branching ratio changes. Further, the penetration of the adhesive 16 is insufficient and the adhesive strength becomes insufficient.

【0011】[0011]

【実施例】以下、本発明を適用する光ファイバカプラの
製造方法の実施例を、図面により詳細に説明する。
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a method for manufacturing an optical fiber coupler to which the present invention is applied will be described in detail below with reference to the drawings.

【0012】図1は本発明を適用する製造方法で製造さ
れた光ファイバカプラの実施例の側断面図およびA−A
縦断面図である。
FIG. 1 is a side sectional view and AA of an embodiment of an optical fiber coupler manufactured by a manufacturing method to which the present invention is applied.
FIG.

【0013】図2は本発明を適用する光ファイバカプラ
の製造方法の実施例である。
FIG. 2 shows an embodiment of a method of manufacturing an optical fiber coupler to which the present invention is applied.

【0014】まず、図2を用いて実施例を説明すると、
光ファイバ1および2(直径125μm)は、融着延伸
のための装置に取り付けられる。装置は、光ファイバの
2か所を銜えて相互に逆方向に引っ張るためのクランプ
4および5、光ファイバを加熱するための酸水素炎6を
得るバーナーを有している。クランプ4および5は、ね
じ棒22とガイド棒23および駆動モータMからなる引
っ張り機構に連結している。ねじ棒22は1本の丸棒両
側に左右逆のねじが切られており、装置のシャーシ(不
図示)に軸支されている。ねじ棒22は駆動伝達機構を
介して駆動モータMに連結されている。クランプ4はね
じ棒22の右ねじと螺合し、クランプ5はねじ棒22の
左ねじと螺合している。そしてクランプ4および5は、
装置のシャーシに支持されたガイド棒23に摺動可能に
係合している。さらに装置は所定の波長のレーザ光を発
振する光源7(波長1.3μm)、および光量検出器
8、光量検出器9を有している。また、ねじ棒22とガ
イド棒23は、クランプ4および5とともに装置のシャ
ーシ(不図示)から取り外せるようになっている。すな
わちクランプ4および5、ねじ棒22とガイド棒23
は、融着延伸の済んでいる各光ファイバの相互位置を固
定したまま次工程に移すための仮治具を兼ねている。
First, the embodiment will be described with reference to FIG.
Optical fibers 1 and 2 (125 μm in diameter) are attached to the device for fusion drawing. The device has clamps 4 and 5 for holding the optical fiber at two points and pulling them in opposite directions, and a burner for obtaining an oxyhydrogen flame 6 for heating the optical fiber. The clamps 4 and 5 are connected to a pulling mechanism including a screw rod 22, a guide rod 23, and a drive motor M. The screw rod 22 has left and right screw threads cut on both sides of one round rod, and is pivotally supported by a chassis (not shown) of the apparatus. The screw rod 22 is connected to the drive motor M via a drive transmission mechanism. The clamp 4 is screwed with the right screw of the screw rod 22, and the clamp 5 is screwed with the left screw of the screw rod 22. And the clamps 4 and 5
A guide rod 23 supported by the chassis of the apparatus is slidably engaged. Further, the apparatus has a light source 7 (wavelength 1.3 μm) that oscillates laser light of a predetermined wavelength, a light amount detector 8 and a light amount detector 9. Further, the screw rod 22 and the guide rod 23 can be removed together with the clamps 4 and 5 from the chassis (not shown) of the apparatus. That is, the clamps 4 and 5, the screw rod 22 and the guide rod 23.
Also serves as a temporary jig for moving to the next step while fixing the mutual positions of the optical fibers that have been fusion-stretched.

【0015】光ファイバ1および2は融着すべき部分に
ついて保護被覆材3を予め除去し、クランプ4およびク
ランプ5で2か所を銜え、さらに光源7に光ファイバ1
の入力側、光量検出器8に光ファイバ1の出力側、光量
検出器9に光ファイバ2の出力側を連結する。その中心
部分を酸水素炎6で加熱し、半溶融の状態にしてから駆
動モータMを回転させると、クランプ4とクランプ5は
夫々外方向に移動し、光ファイバ1および2は引っ張ら
れて融着延伸して光結合部分11が形成される。このと
き光量検出器8および光量検出器9で光ファイバ1およ
び2からの出力光量を検出し、分岐比を確認しながら延
伸してゆく。融着延伸してゆくにつれて、光量検出器9
の検出光量(光ファイバ2からの出力光量)が徐々に増
加し、逆に光量検出器8の検出光量(光ファイバ1から
の出力光量)が徐々に減少する。所望の分岐比(例えば
光量検出器8の検出光量と光量検出器9の検出光量が一
致したとき、すなわち分岐比1:1)になったとき駆動
モータMを停止させ、酸水素炎6をとめて融着延伸をや
める。
In the optical fibers 1 and 2, the protective coating material 3 is removed in advance from the portion to be fused, and the clamp 4 and the clamp 5 are used to hold the optical fiber 1 at two locations.
Of the optical fiber 1 to the light amount detector 8 and the output side of the optical fiber 2 to the light amount detector 9. When the drive motor M is rotated after heating the central portion with the oxyhydrogen flame 6 to bring it into a semi-molten state, the clamps 4 and 5 move outward, respectively, and the optical fibers 1 and 2 are pulled and melted. The optical coupling portion 11 is formed by stretching and stretching. At this time, the light amount detector 8 and the light amount detector 9 detect the output light amounts from the optical fibers 1 and 2, and extend while confirming the branching ratio. As the fusion drawing is performed, the light amount detector 9
The amount of light detected (the amount of light output from the optical fiber 2) gradually increases, and conversely, the amount of light detected by the light amount detector 8 (the amount of light output from the optical fiber 1) gradually decreases. When the desired branching ratio (for example, the detected light amount of the light amount detector 8 and the detected light amount of the light amount detector 9 match, that is, the branching ratio 1: 1), the drive motor M is stopped and the oxyhydrogen flame 6 is stopped. And stop the fusion drawing.

【0016】前記工程により光ファイバ1および2の融
着延伸物を8本製造し、夫々の融着延伸物の分岐比と過
剰損失を測定する。この工程を実施例2〜7、比較例1
・8とし、分岐比と過剰損失の測定結果を接着収納前と
して表1に示した。
Eight fused stretched products of the optical fibers 1 and 2 are manufactured by the above process, and the branching ratio and excess loss of each fused stretched product are measured. This step is performed in Examples 2 to 7 and Comparative Example 1
・ 8, and the measurement results of the branching ratio and the excess loss are shown in Table 1 before the adhesive storage.

【0017】前記工程による光ファイバ1および2の融
着延伸物は、クランプ4および5に銜えられたままねじ
棒22とガイド棒23が装置のシャーシから取り外さ
れ、図1に示すように、2枚の石英板の保護部材17の
間に挟まれ、光結合部分11の前後を、紫外線硬化型の
エポキシ樹脂の接着剤16(1液タイプまたは2液タイ
プ)で接着される。この際、前記8本の光ファイバ1お
よび2の融着延伸物は比較例1に 500cpsの粘度の接
着剤16を、実施例2に1000cpsの粘度の接着剤16
を、実施例3に 5000 cpsの粘度の接着剤16を、実
施例4に 10000cpsの粘度の接着剤16を、 実施例5
に20000 cpsの粘度の接着剤16を、実施例6に2500
0 cpsの粘度の接着剤16を、実施例7に50000 cp
sの粘度の接着剤16を、比較例8に187000cpsの粘
度の接着剤16を使用して接着固定される。ここでクラ
ンプ4とクランプ5を外し、仮治具であるクランプ4お
よび5、ねじ棒22とガイド棒23を取り去る。
In the fusion-stretched drawn products of the optical fibers 1 and 2 obtained by the above process, the screw rod 22 and the guide rod 23 are removed from the chassis of the apparatus while being held by the clamps 4 and 5, and as shown in FIG. It is sandwiched between protective members 17 made of a single quartz plate, and the front and rear of the optical coupling portion 11 are adhered by an ultraviolet curing epoxy resin adhesive 16 (one-liquid type or two-liquid type). At this time, the fused stretched products of the eight optical fibers 1 and 2 were the adhesive 16 having a viscosity of 500 cps in Comparative Example 1 and the adhesive 16 having a viscosity of 1000 cps in Example 2.
Example 3, the adhesive 16 having a viscosity of 5000 cps, Example 4 the adhesive 16 having a viscosity of 10,000 cps, Example 5
Adhesive 16 having a viscosity of 20000 cps in Example 6 and 2500 in Example 6
Adhesive 16 having a viscosity of 0 cps was added to Example 7 at 50,000 cps.
An adhesive 16 having a viscosity of s is adhered and fixed to Comparative Example 8 using an adhesive 16 having a viscosity of 187,000 cps. Here, the clamps 4 and 5 are removed, and the clamps 4 and 5, which are temporary jigs, and the screw rod 22 and the guide rod 23 are removed.

【0018】さらにこのように保護部材17に接着固定
された光ファイバ1および2の融着延伸物を、保護ケー
ス14(外径3.3mm、内径3.0mm、長さ50mmのス
テンレス製パイプ)内に収納して石英板の保護部材17
と保護ケース14との間を接着剤20(シリコーン系接
着剤KE45RTV 、信越化学工業株式会社製)で接着固定
し、さらに保護ケース14の両端を接着剤20で固めて
密封し、光ファイバカプラが完成する(図1A−A断面
図参照)。このとき、実施例2〜7と、比較例1・8の
8本の光ファイバカプラの、夫々の接着剤16の粘度に
おける接着収納後の分岐比と過剰損失を測定する。夫々
の接着剤16の粘度における測定結果は、接着収納後と
して表1に示した。
Further, the fusion-stretched and drawn product of the optical fibers 1 and 2 thus fixed and adhered to the protective member 17 is used as a protective case 14 (outer diameter 3.3 mm, inner diameter 3.0 mm, length 50 mm stainless steel pipe). It is housed in a quartz plate protection member 17
The adhesive 20 (silicone adhesive KE45RTV, manufactured by Shin-Etsu Chemical Co., Ltd.) is adhesively fixed between the protective case 14 and the protective case 14, and further, both ends of the protective case 14 are fixed with the adhesive 20 and sealed, and the optical fiber coupler is Completed (see cross-sectional view of FIG. 1A-A). At this time, the branching ratio and the excessive loss of the eight optical fiber couplers of Examples 2 to 7 and Comparative Examples 1 to 8 after the adhesive is housed in the viscosity of each adhesive 16 are measured. The measurement results of the viscosity of each adhesive 16 are shown in Table 1 after the adhesive was stored.

【0019】さらにその8本の光ファイバカプラの接着
剤16を、−40℃〜85℃で収縮、膨張させる熱衝撃
テストを5回行った後、実施例2〜7と、比較例1・8
の8本の光ファイバカプラの分岐比と過剰損失を測定す
る。夫々の接着剤16の粘度における測定結果は、熱衝
撃テスト後として表1に示した。
Further, a thermal shock test of shrinking and expanding the adhesive 16 of the eight optical fiber couplers at -40 ° C. to 85 ° C. was carried out 5 times, and then, Examples 2 to 7 and Comparative Examples 1.8 were carried out.
The branching ratio and excess loss of the eight optical fiber couplers are measured. The measurement results of the viscosity of each adhesive 16 are shown in Table 1 after the thermal shock test.

【0020】前記測定の結果、粘度が 500cpsと1870
00cpsの接着剤16を使用した2本の光ファイバカプ
ラは、保護部材17に接着収納する前後および熱衝撃テ
ストの後において、分岐比および過剰損失の特性の変動
が大きかったのに対して、粘度が1000〜50000 cpsの
接着剤16を使用した6本の光ファイバカプラは、特性
の変動がほとんどなかった。
As a result of the above measurement, the viscosity was 500 cps and 1870.
The two optical fiber couplers using the adhesive 16 of 00 cps had large fluctuations in the characteristics of the branching ratio and the excess loss before and after being adhesively housed in the protective member 17 and after the thermal shock test. The six optical fiber couplers using the adhesive 16 of 1000 to 50,000 cps showed almost no change in characteristics.

【0021】なお、光ファイバカプラの分岐比と過剰損
失は、夫々次式で定義される。
The branching ratio and the excess loss of the optical fiber coupler are defined by the following equations, respectively.

【0022】[0022]

【数式1】 [Formula 1]

【0023】P1:光ファイバ1への入射光量 P3:光ファイバ1からの出射光量 P4:光ファイバ2からの出射光量P1: incident light amount to the optical fiber 1 P3: emitted light amount from the optical fiber 1 P4: emitted light amount from the optical fiber 2

【0024】[0024]

【表1】 [Table 1]

【0025】[0025]

【発明の効果】以上、詳細に説明したように本発明の光
ファイバカプラの製造方法では、保護部材への接着にお
いて、光結合部の前後を20℃での粘度が1000〜50000
cpsの接着剤を使用したことにより、複数本の光ファ
イバを融着、延伸した後に保護部材に接着収納する前後
において、分岐比および過剰損失の特性は変動がほとん
どなく、しかも熱衝撃テストの後でもその特性がほとん
ど変動しない光ファイバカプラを得ることができる。
As described above in detail, in the method of manufacturing the optical fiber coupler of the present invention, the viscosity at 20 ° C. before and after the optical coupling portion is 1000 to 50000 in the adhesion to the protective member.
By using the cps adhesive, the characteristics of branching ratio and excess loss hardly change before and after the adhesive is housed in the protective member after fusing and drawing multiple optical fibers, and after the thermal shock test. However, it is possible to obtain an optical fiber coupler whose characteristics hardly change.

【図面の簡単な説明】[Brief description of drawings]

【図1】本発明を適用する製造方法で製造された光ファ
イバカプラの実施例の側断面図および縦断面図である。
FIG. 1 is a side sectional view and a vertical sectional view of an embodiment of an optical fiber coupler manufactured by a manufacturing method to which the present invention is applied.

【図2】本発明を適用する光ファイバカプラの製造方法
の実施例の工程途中を示す概略正面図である。
FIG. 2 is a schematic front view showing a process in the middle of an embodiment of a method for manufacturing an optical fiber coupler to which the present invention is applied.

【符号の説明】[Explanation of symbols]

1・2は光ファイバ、3は保護被覆材、4・5はクラン
プ、6は酸水素炎、7は光源、8・9は光検出器、11
は光結合部分、14は保護ケース、16・20は接着
剤、17は保護部材、22はねじ棒、23はガイド棒、
Mはモータである。
1 and 2 are optical fibers, 3 is a protective coating, 4 and 5 are clamps, 6 is an oxyhydrogen flame, 7 is a light source, 8 and 9 are photodetectors, 11
Is an optical coupling portion, 14 is a protective case, 16 and 20 are adhesives, 17 is a protective member, 22 is a screw rod, 23 is a guide rod,
M is a motor.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 複数の光ファイバを束ね、その一部分を
加熱しながら融着延伸して光結合させてから、保護部材
に接着収納する光ファイバカプラの製造方法において、
光結合部の前後を20℃での粘度が 1000 〜50000 cp
sの接着剤で保護部材に接着することを特徴とする光フ
ァイバカプラの製造方法。
1. A method of manufacturing an optical fiber coupler, which comprises bundling a plurality of optical fibers, fusion-drawing and heating a part of them to optically couple them, and then adhesively accommodating them in a protective member.
Viscosity at 20 ℃ before and after the optical coupling part is 1000 ~ 50,000 cp
A method of manufacturing an optical fiber coupler, characterized in that it is adhered to a protective member with an adhesive of s.
JP11157093A 1993-05-13 1993-05-13 Manufacturing method of optical fiber coupler Expired - Fee Related JP3161866B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP11157093A JP3161866B2 (en) 1993-05-13 1993-05-13 Manufacturing method of optical fiber coupler

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11157093A JP3161866B2 (en) 1993-05-13 1993-05-13 Manufacturing method of optical fiber coupler

Publications (2)

Publication Number Publication Date
JPH06324229A true JPH06324229A (en) 1994-11-25
JP3161866B2 JP3161866B2 (en) 2001-04-25

Family

ID=14564730

Family Applications (1)

Application Number Title Priority Date Filing Date
JP11157093A Expired - Fee Related JP3161866B2 (en) 1993-05-13 1993-05-13 Manufacturing method of optical fiber coupler

Country Status (1)

Country Link
JP (1) JP3161866B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6517256B2 (en) 1998-12-10 2003-02-11 Nec Corporation Optical connector having ferrule and method of assembling the optical connector
EP2108984A1 (en) * 2008-04-11 2009-10-14 The Boeing Company Optical reflective star coupler

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6517256B2 (en) 1998-12-10 2003-02-11 Nec Corporation Optical connector having ferrule and method of assembling the optical connector
EP2108984A1 (en) * 2008-04-11 2009-10-14 The Boeing Company Optical reflective star coupler
US7965913B2 (en) 2008-04-11 2011-06-21 The Boeing Company Optical star coupler

Also Published As

Publication number Publication date
JP3161866B2 (en) 2001-04-25

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