JP2974808B2 - Optical fixed attenuator - Google Patents
Optical fixed attenuatorInfo
- Publication number
- JP2974808B2 JP2974808B2 JP3061657A JP6165791A JP2974808B2 JP 2974808 B2 JP2974808 B2 JP 2974808B2 JP 3061657 A JP3061657 A JP 3061657A JP 6165791 A JP6165791 A JP 6165791A JP 2974808 B2 JP2974808 B2 JP 2974808B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- ferrule
- optical
- hole
- assembly
- 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.)
- Expired - Fee Related
Links
Landscapes
- Light Guides In General And Applications Therefor (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、光通信システムや光計
測分野において光ファイバ線路を用いたときに光受信装
置へ信号を最適レベルで受信させる等のために使用され
る光固定減衰器に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fixed optical attenuator which is used for receiving a signal at an optimum level to an optical receiver when an optical fiber line is used in an optical communication system or an optical measurement field. Things.
【０００２】[0002]
【従来の技術】一般に、光ファイバを加熱等でその一部
を延伸させて、光ファイバを伝搬する光をこの延伸部で
減衰させることにより光固定減衰器として利用できるこ
とが知られている。また、特開平２−228609号公報に
は、クラッド部に光吸収層を有する光ファイバを加熱延
伸して所定の減衰量を得るようにした光固定減衰器が公
開されている。2. Description of the Related Art It is generally known that an optical fiber can be used as a fixed optical attenuator by extending a part of the optical fiber by heating or the like and attenuating the light propagating through the optical fiber at the extending portion. Japanese Patent Application Laid-Open No. 2-228609 discloses an optical fixed attenuator in which an optical fiber having a light absorbing layer in a clad portion is heated and drawn to obtain a predetermined attenuation.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、光ファ
イバの一部を延伸させた光固定減衰器はその延伸細径部
が20〜30μｍという極めて細いものであるため光通信シ
ステムなどに組み入れるときこの細径部が破断してしま
い、実用に殆ど耐えない。However, an optical fixed attenuator in which a part of an optical fiber is extended has an extremely small diameter of 20 to 30 μm. The diameter part breaks and is hardly practical.
【０００４】[0004]
【課題を解決するための手段】そこで、本発明は、上記
の事情に鑑み、延伸細径部が破断しないようにすべく、
光ファイバ50を収納固定部材である圧入サブアッシィ10
0(図１参照) に挿入した状態で加熱延伸し、所定光減衰
量を得た後、延伸された光ファイバ50をその状態で圧入
サブアッシィ100に接着剤により固着一体化させたもの
である。そのために、本発明の光固定減衰器は、光ファ
イバに２個のフェルールを所要距離を隔て外嵌め配置
し、前記２個のフェルール間の隙間を覆うように側壁に
火炎加熱用窓を有する筒体の継手を、両フェルールの対
向端部に外嵌めしてなるものとした。さらに前記フェル
ールは光ファイバを接着するための孔を設けたものであ
る。SUMMARY OF THE INVENTION In view of the above circumstances, the present invention has been made in order to prevent the stretched small diameter portion from being broken.
Press-fit sub-assembly 10 that holds and fixes optical fiber 50
In this state, the optical fiber 50 is heated and stretched in a state where it is inserted into the sub-assembly 100 (see FIG. 1) to obtain a predetermined amount of light attenuation. For this purpose, a fixed optical attenuator according to the present invention comprises a cylinder having a flame heating window on a side wall in which two ferrules are externally fitted on an optical fiber at a required distance and covered with a gap between the two ferrules. The joint of the body was externally fitted to the opposite ends of both ferrules. Further, the ferrule is provided with a hole for bonding an optical fiber.
【０００５】[0005]
【実施例】本発明を添付する図１〜７に示す具体的一実
施例に基づいて以下詳細に説明する。図１において、セ
ラミック製の円柱体のフェルール１には軸方向に光ファ
イバ50を挿入する小孔７が穿設してあり、小孔７の他の
フェルール１と対向する端部はテーパ孔７ａに形成して
ある。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below based on a specific embodiment shown in FIGS. In FIG. 1, a small hole 7 through which an optical fiber 50 is inserted is formed in a ceramic cylindrical ferrule 1 in an axial direction, and the other end of the small hole 7 facing the ferrule 1 is a tapered hole 7a. It is formed in.
【０００６】また、軸線方向で隙間を隔てて配置したフ
ェルール１の両フェルール１の隙間を覆う継手５は、高
耐熱性、高剛性を有する筒体で、フェルール１に外嵌め
できるように設定してあり、側壁には内部を通る光ファ
イバ50を加熱できるように、火炎加熱用窓６が開口して
ある。フェルール１の小孔７の他のフェルール１との対
向端面寄りに小孔７内に挿入した光ファイバ50を接着固
定するための貫通孔２が直交状に穿設してあり、また、
フェルール１の他の端面寄りに同様に小孔７内に挿入し
た光ファイバ50を接着固定する底付孔３が凹設してあ
る。The joint 5 for covering the gap between the two ferrules 1 of the ferrule 1 arranged with a gap therebetween in the axial direction is a cylindrical body having high heat resistance and high rigidity, and is set so as to be fitted to the ferrule 1 outside. A flame heating window 6 is opened in the side wall so that the optical fiber 50 passing through the inside can be heated. A through-hole 2 for bonding and fixing an optical fiber 50 inserted into the small hole 7 is orthogonally formed near the end face of the small hole 7 of the ferrule 1 facing the other ferrule 1.
Near the other end face of the ferrule 1, a bottomed hole 3 for adhesively fixing the optical fiber 50 similarly inserted into the small hole 7 is formed in a recess.
【０００７】また、光ファイバ50を固定するために接着
剤を注入する貫通孔２および底付孔３を有するセラミッ
ク材質のフェルール１を火炎加熱用窓６を対面する２ヵ
所に設けた高耐熱性、高剛性を有するセラミック材質の
継手５に圧入する (以下このサブアッシィを、「圧入サ
ブアッシィ100 」と略称する) 。図２に圧入サブアッシ
ィ100の正面外観図を示した。次に、この圧入サブアッ
シィ100の光ファイバ用小孔７−７に光ファイバ50を挿
入し、図５に示すように、この状態で加熱延伸装置200
の固定台201に圧入サブアッシィ100を装着固定し、光フ
ァイバ50の一端を光源に、他端を光パワーメータに光フ
ァイバアダプタ (図示せず) で結合する。Further, a ferrule 1 made of a ceramic material having a through hole 2 for injecting an adhesive for fixing the optical fiber 50 and a hole 3 with a bottom is provided at two places facing the window 6 for flame heating. Is pressed into a joint 5 made of a ceramic material having high rigidity (hereinafter, this sub-assembly is abbreviated as "press-fit sub-assy 100"). FIG. 2 is a front external view of the press-fit sub-assembly 100. Next, the optical fiber 50 is inserted into the optical fiber small hole 7-7 of the press-fit sub-assembly 100, and as shown in FIG.
The press-fit sub-assembly 100 is mounted and fixed to the fixed base 201, and one end of the optical fiber 50 is connected to a light source, and the other end is connected to an optical power meter by an optical fiber adapter (not shown).
【０００８】そしてファイバ軸方向に微往復動の可能な
酸素−プロパンバーナ202などで圧入サブアッシィ100の
２個の火炎加熱用窓６から光ファイバ50を加熱し、かつ
外部からファイバを軸方向に延伸 (延伸機構図示せず)
する。所定光減衰量に達した瞬間に加熱および延伸を停
止する。次に、図３に示すようにフェルール１の貫通孔
２に接着剤８を滴下、注入し、加熱延伸された光ファイ
バ50をフェルール１に固定し、加熱延伸部９を外力から
保護、遮断する。Then, the optical fiber 50 is heated from the two flame heating windows 6 of the press-fit sub-assembly 100 by an oxygen-propane burner 202 or the like capable of finely reciprocating in the fiber axial direction, and the fiber is axially drawn from the outside. (Drawing mechanism not shown)
I do. The heating and stretching are stopped as soon as the predetermined amount of light attenuation is reached. Next, as shown in FIG. 3, an adhesive 8 is dropped and injected into the through hole 2 of the ferrule 1, the optical fiber 50 that has been heated and stretched is fixed to the ferrule 1, and the heated and stretched portion 9 is protected and cut off from external force. .
【０００９】また、フェルール１の外側端部より数mm離
れた位置で光ファイバ50の両端部をカットし、加熱延伸
装置200の固定台201より取り外す。さらに、図４に示す
ようにフェルール１に設置した底付孔３に圧力ポンプ
(図示せず) を使用して、接着剤10をフェルール１の先
端部11まで溢出するまで圧入し、光ファイバ50を圧入サ
ブアッシィ100に完全固定し、水密性部材12で継手５の
凹み段部13を包着し火炎加熱用窓６を閉じる。Further, both ends of the optical fiber 50 are cut at a position several mm away from the outer end of the ferrule 1 and detached from the fixing table 201 of the heating and stretching apparatus 200. In addition, as shown in FIG.
Using an adhesive (not shown), the adhesive 10 is press-fitted until it overflows to the tip 11 of the ferrule 1, the optical fiber 50 is completely fixed to the press-fit sub-assembly 100, 13 and the flame heating window 6 is closed.
【００１０】次に、図６に示すようにフェルール研磨機
および治具 (図示せず) によりフェルール１の両端をＰ
Ｃ研磨し、球面14を創生し、光固定減衰器フェルールア
ッシィ300が完成する。圧入サブアッシィ100の段部端面
14からフェルール１の球面端14までの寸法Ｌ1、Ｌ3およ
び継手５の段部14−14の寸法Ｌ2、継手５の最大外径Φd
2およびフェルール１の外径Φd1は、光通信システムに
導入の際、光固定減衰器コンポーネントに組込み便利な
ように決められる。Next, as shown in FIG. 6, both ends of the ferrule 1 are turned to P by a ferrule polishing machine and a jig (not shown).
C polishing is performed to create the spherical surface 14, and the optical fixed attenuator ferrule assembly 300 is completed. Step end face of press-fit sub-assembly 100
Dimensions L 1 and L 3 from 14 to the spherical end 14 of the ferrule 1, dimension L 2 of the step 14-14 of the joint 5, and maximum outer diameter Φd of the joint 5
The outer diameter Φd 1 of the ferrule 2 and the ferrule 1 are determined so as to be conveniently incorporated into an optical fixed attenuator component when introduced into an optical communication system.
【００１１】図７にＳＣコネクタ形、プラグジャック式
に光固定減衰器フェルールアッシィ300を組込んだ実施
例を示す。なお、光ファイバ50は一般に市販されている
もの、あるいはクラッドに光吸収層を有するものなどに
特に限定されることはない。上記実施例では、加熱温度
調整、火炎の微往復動調整、延伸用引張力の調節など多
ステップコントロール可能な装置および精密な端面研磨
機を使用したので、再現性の良い減衰量を有する光固定
減衰器が得られた。FIG. 7 shows an embodiment in which an optical fixed attenuator ferrule assembly 300 is incorporated in an SC connector type, plug jack type. The optical fiber 50 is not particularly limited to a commercially available optical fiber or a fiber having a light absorbing layer in a clad. In the above embodiment, a device capable of multi-step control, such as heating temperature adjustment, fine reciprocation adjustment of the flame, and adjustment of the tensile force for stretching, and a precise end surface polishing machine are used. An attenuator was obtained.
【００１２】また、クラッドに光吸収層を設けてある光
減衰用ファイバを使用した場合には、40dB以上の高反射
減衰量が得られた。When a light-attenuating fiber having a light-absorbing layer on the cladding was used, a high return loss of 40 dB or more was obtained.
【００１３】[0013]
【発明の効果】以上のように、本発明は、構成されてい
るので、光ファイバの加熱延伸部が破断することなく、
光通信システム等へと光固定減衰器を組み入れることが
できる。As described above, since the present invention is constituted, the heat drawn portion of the optical fiber does not break,
An optical fixed attenuator can be incorporated into an optical communication system or the like.
【図１】本発明の一実施例を示す圧入サブアッシィ100
の断面図である。FIG. 1 shows a press-fit subassembly 100 showing an embodiment of the present invention.
FIG.
【図２】本発明の一実施例を示す圧入サブアッシィ100
の正面外観図である。FIG. 2 shows a press-fit subassembly 100 showing one embodiment of the present invention.
FIG.
【図３】本発明の一実施例を示す光ファイバ50を加熱延
伸したときの圧入サブアッシィ100 の断面図である。FIG. 3 is a cross-sectional view of a press-fit subassembly 100 when an optical fiber 50 according to an embodiment of the present invention is drawn by heating.
【図４】本発明の一実施例を示す光ファイバ50を圧入サ
ブアッシィ100に接着完全固定した図である。FIG. 4 is a view in which an optical fiber 50 according to an embodiment of the present invention is completely fixed by bonding to a press-fit sub-assembly 100.
【図５】本発明の一実施例を示す光ファイバ50を加熱延
伸している状態の図である。FIG. 5 is a view showing a state in which an optical fiber 50 according to an embodiment of the present invention is heated and drawn.
【図６】本発明の一実施例を示すフェルール端面をＰＣ
研磨した光固定減衰器フェルールアッシィ300の断面図
である。FIG. 6 shows a ferrule end face showing a PC according to an embodiment of the present invention.
FIG. 3 is a cross-sectional view of a polished optical fixed attenuator ferrule assembly 300.
【図７】本発明の一実施例を示す光固定減衰器フェルー
ルアッシィ300をプラグジャック式にＳＣコネクタ形に
組み込んだ場合の半縦断面図である。FIG. 7 is a semi-longitudinal sectional view of a case where the optical fixed attenuator ferrule assembly 300 showing one embodiment of the present invention is incorporated in an SC connector type in a plug jack type.
50…光ファイバ １…フェルール ６…火炎加熱用窓 ５…継手 ２…貫通孔（接着するための孔の例） ３…底付孔（接着するための孔の例） 50 ... optical fiber 1 ... ferrule 6 ... flame heating window 5 ... joint 2 ... through hole (example of hole for bonding) 3 ... bottom hole (example of hole for bonding)
Claims (2)
離を隔て外嵌め配置し、前記２個のフェルール間の隙間
を覆うように側壁に火炎加熱用窓を有する筒体の継手
を、両フェルールの対向端部に外嵌めし、前記火炎加熱
用窓から光ファイバが加熱され延伸部を形成されている
ことを特徴とする光固定減衰器。1. A joint of a cylindrical body having a flame heating window on a side wall so as to cover a gap between the two ferrules, wherein two ferrules are externally fitted and arranged on the optical fiber at a predetermined distance. Wherein the optical fiber is heated from the flame heating window to form an extended portion.
の孔を設けたことを特徴とする請求項第１項記載の光固
定減衰器。2. The optical fixed attenuator according to claim 1, wherein a hole for bonding an optical fiber is provided in the ferrule.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3061657A JP2974808B2 (en) | 1991-03-26 | 1991-03-26 | Optical fixed attenuator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3061657A JP2974808B2 (en) | 1991-03-26 | 1991-03-26 | Optical fixed attenuator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04295806A JPH04295806A (en) | 1992-10-20 |
| JP2974808B2 true JP2974808B2 (en) | 1999-11-10 |
Family
ID=13177516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3061657A Expired - Fee Related JP2974808B2 (en) | 1991-03-26 | 1991-03-26 | Optical fixed attenuator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2974808B2 (en) |
-
1991
- 1991-03-26 JP JP3061657A patent/JP2974808B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04295806A (en) | 1992-10-20 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |