JP3102816B2 - Optical fiber coupler tension measurement method - Google Patents
Optical fiber coupler tension measurement methodInfo
- Publication number
- JP3102816B2 JP3102816B2 JP04009506A JP950692A JP3102816B2 JP 3102816 B2 JP3102816 B2 JP 3102816B2 JP 04009506 A JP04009506 A JP 04009506A JP 950692 A JP950692 A JP 950692A JP 3102816 B2 JP3102816 B2 JP 3102816B2
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- fiber coupler
- tension
- fusion
- measured
- 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.)
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- Force Measurement Appropriate To Specific Purposes (AREA)
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、複数本の光ファイバの
一部を加熱融着・延伸して融着延伸部を形成し、該融着
延伸部で光を分岐、合流、分波又は合波する光ファイバ
カプラに加わる張力の測定方法に関し、特に補強後の融
着延伸部に加わる張力を測定可能な張力測定方法であ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a fusion-stretched portion by heating and fusing a part of a plurality of optical fibers to form a fusion-stretched portion. The present invention relates to a method for measuring a tension applied to a multiplexed optical fiber coupler, and particularly to a tension measurement method capable of measuring a tension applied to a fused and stretched portion after reinforcement.
【０００２】[0002]
【従来の技術】図４は、従来より知られている融着延伸
形光ファイバカプラの一例を示すものである。この光フ
ァイバカプラ１は、２本の光ファイバ２，３の一部に融
着延伸部４を形成して構成されている。光ファイバカプ
ラ１の融着延伸部４は非常に細く機械強度が低いため、
補強ケース５に入れて補強されている。補強ケース５内
の光ファイバカプラ１は、補強ケース５の両側部に接着
剤６を注入固化させて補強ケース５に固定されている。2. Description of the Related Art FIG. 4 shows an example of a conventionally known fusion-stretched optical fiber coupler. This optical fiber coupler 1 is configured by forming a fusion-stretched portion 4 on a part of two optical fibers 2 and 3. Since the fusion drawing portion 4 of the optical fiber coupler 1 is very thin and has low mechanical strength,
It is reinforced in a reinforcing case 5. The optical fiber coupler 1 in the reinforcing case 5 is fixed to the reinforcing case 5 by injecting and solidifying an adhesive 6 on both sides of the reinforcing case 5.
【０００３】ところで、このような光ファイバカプラ１
を製造するには、まず２つの延伸台に２本の光ファイバ
２，３を固定し、各延伸台間に配設された光ファイバの
一部を酸水素バーナで加熱し、これら光ファイバ２，３
の一部を加熱融着させ、各延伸台を離間する方向に移動
させて加熱融着部分を延伸して融着延伸部４を形成す
る。この融着延伸する際に、一方の光ファイバ２の一端
から測定光を入射し、各光ファイバ２，３の他端をそれ
ぞれパワーメータに接続し、それぞれの光ファイバの出
射光の光パワーをモニタし、所定の分岐比が得られるよ
うに延伸し、分岐比が一定の値となった時点で加熱およ
び延伸を終了する。このように製造された融着延伸型光
ファイバカプラは、光ファイバ内を伝搬する光を分岐、
合流、分波又は合波することができ、光ファイバ通信
路、光ファイバセンサ技術などにおける光結合部材とし
て使用される。Incidentally, such an optical fiber coupler 1
First, two optical fibers 2 and 3 are fixed to two stretching tables, and a part of the optical fibers disposed between the respective stretching tables is heated by an oxyhydrogen burner. , 3
Are heated and fused, and the respective stretching tables are moved in the direction in which they are separated from each other, and the heated fused portions are stretched to form the fused stretched portions 4. At the time of this fusion stretching, measurement light is incident from one end of one optical fiber 2, the other ends of the optical fibers 2 and 3 are connected to power meters, respectively, and the optical power of light emitted from each optical fiber is measured. The film is monitored and stretched so as to obtain a predetermined branching ratio. When the branching ratio becomes a constant value, the heating and the stretching are completed. The fusion-stretched optical fiber coupler manufactured in this manner branches light propagating in the optical fiber,
It can be multiplexed, demultiplexed or multiplexed, and is used as an optical coupling member in optical fiber communication paths, optical fiber sensor technology, and the like.
【０００４】[0004]
【発明が解決しようとする課題】このような光ファイバ
カプラ１は、融着延伸部４の機械強度が低いために、そ
の部分に余分な張力が加わっているのは好ましくなく、
更に融着延伸部４に張力が加わると、光ファイバカプラ
の結合度の波長特性が変動し、所定の分岐比が得られな
くなる場合がある。一方、上述した補強後の光ファイバ
カプラ１では、補強ケース５内に光ファイバカプラ１を
入れて接着剤６で固定する際に、接着剤６の硬化収縮に
伴って融着延伸部４に張力が生じてしまう場合があっ
た。In such an optical fiber coupler 1, since the mechanical strength of the fusion-stretched portion 4 is low, it is not preferable that extra tension is applied to the portion.
Further, when tension is applied to the fusion-bonded and stretched portion 4, the wavelength characteristic of the degree of coupling of the optical fiber coupler fluctuates, and a predetermined branching ratio may not be obtained. On the other hand, in the above-mentioned reinforced optical fiber coupler 1, when the optical fiber coupler 1 is put in the reinforcing case 5 and fixed with the adhesive 6, the tension is applied to the fusion-bonded stretched portion 4 as the adhesive 6 cures and contracts. Sometimes occurred.
【０００５】そして従来は、この補強後の光ファイバカ
プラに加わる張力を測定することができなかった。即
ち、補強後の光ファイバカプラ１の張力を測定すべく、
補強ケース５の両側に延び出した光ファイバについて張
力を測定しても、融着延伸部４は補強ケース５によって
固定されているために接着剤６の外側の光ファイバと補
強ケース５にかかる張力を測定することになり、補強ケ
ース５内の融着延伸部４に実際に加わっている張力を測
定することは不可能である。本発明は上記事情に鑑みて
なされたもので、補強後の光ファイバカプラに加わる張
力を測定することが可能な測定方法の提供を目的として
いる。Conventionally, it has been impossible to measure the tension applied to the reinforced optical fiber coupler. That is, to measure the tension of the optical fiber coupler 1 after reinforcement,
Even if the tension of the optical fiber extending to both sides of the reinforcing case 5 is measured, the fusion-stretched portion 4 is fixed by the reinforcing case 5 and thus the tension applied to the optical fiber outside the adhesive 6 and the reinforcing case 5. Therefore, it is impossible to measure the tension actually applied to the fusion-stretched portion 4 in the reinforcing case 5. The present invention has been made in view of the above circumstances, and has as its object to provide a measurement method capable of measuring a tension applied to a reinforced optical fiber coupler.
【０００６】[0006]
【課題を解決するための手段】本発明は上記課題を解消
するために、複数本の光ファイバの一部を加熱融着・延
伸して融着延伸部を形成し、該融着延伸部で光を分岐、
結合する光ファイバカプラの張力測定方法であって、延
伸を終えた光ファイバカプラの入射端の１つから光を入
射しつつ、各出射端からの出射光強度を測定して結合度
の波長特性を測定し、さらに該光ファイバカプラに種々
の張力を加えて結合度の波長特性を測定して各張力での
波長特性の変動パターンを求めておき、次いで該光ファ
イバカプラを補強部材で固定し、補強後の光ファイバカ
プラについて結合度の波長特性を測定し、ここで得られ
た波長特性を、上記各張力での波長特性の変動パターン
と照合することによって、補強後の光ファイバカプラの
融着延伸部に加わる張力を測定することを特徴とする光
ファイバカプラの張力測定方法を提供する。According to the present invention, in order to solve the above-mentioned problems, a plurality of optical fibers are heat-sealed and stretched to form a melt-stretched portion. Split the light,
A method for measuring the tension of an optical fiber coupler to be coupled, wherein the intensity of light emitted from each output end is measured while light is incident from one of the input ends of the optical fiber coupler after stretching, and the wavelength characteristic of the degree of coupling is measured. Is measured, and further, various tensions are applied to the optical fiber coupler to measure the wavelength characteristics of the coupling degree to obtain a fluctuation pattern of the wavelength characteristics at each tension, and then the optical fiber coupler is fixed with a reinforcing member. By measuring the wavelength characteristic of the coupling degree of the reinforced optical fiber coupler, and comparing the obtained wavelength characteristic with the fluctuation pattern of the wavelength characteristic at each tension described above, the fusion of the reinforced optical fiber coupler is performed. Provided is a method for measuring the tension of an optical fiber coupler, which comprises measuring a tension applied to a drawing / drawing section.
【０００７】また、本発明は上記課題を解消するため
に、複数本の光ファイバの一部を加熱融着・延伸して融
着延伸部を形成し、該融着延伸部で光を分岐、結合する
光ファイバカプラの張力測定方法であって、延伸を終え
た光ファイバカプラの入射端の１つから光を入射しつ
つ、各出射端からの出射光強度を測定し、入射光強度か
ら出射光強度を差し引いて結合損失率を測定し、さらに
該光ファイバカプラに種々の張力を加えて結合損失を測
定し、張力と結合損失との関係を求め、次いで該光ファ
イバカプラを補強部材で固定し、補強後の光ファイバカ
プラについて結合損失を測定し、ここで得られた結合損
失を、上記張力と結合損失との関係に照合することによ
って、補強後の光ファイバカプラの融着延伸部に加わる
張力を測定することを特徴とする光ファイバカプラの張
力測定方法を提供する。Further, in order to solve the above-mentioned problems, the present invention forms a fusion-stretched portion by heat-sealing and stretching a part of a plurality of optical fibers, and branches the light at the fusion-stretched portion. This is a method for measuring the tension of an optical fiber coupler to be coupled, in which light is emitted from one of the input ends of an optical fiber coupler that has been stretched, and the output light intensity from each output end is measured. The coupling loss rate is measured by subtracting the emission intensity, the coupling loss is measured by further applying various tensions to the optical fiber coupler, the relationship between the tension and the coupling loss is determined, and then the optical fiber coupler is fixed with a reinforcing member. Then, the coupling loss of the reinforced optical fiber coupler is measured, and the obtained coupling loss is compared with the relationship between the tension and the coupling loss, so that the reinforced optical fiber coupler is connected to the fused and stretched portion of the optical fiber coupler. To measure the applied tension. Provides a tension measuring method for the optical fiber coupler according to symptoms.
【０００８】[0008]
【作用】本発明による張力測定方法は、延伸を終えた光
ファイバカプラの入射端の１つから光を入射しつつ、各
出射端からの出射光強度を測定して結合度の波長特性ま
たは結合損失を測定し、さらに該光ファイバカプラに種
々の張力を加えて結合度の波長特性または結合損失を測
定し、次いで該光ファイバカプラを補強部材で固定し、
補強後の光ファイバカプラについて結合度の波長特性ま
たは結合損失を測定し、ここで得られた波長特性または
結合損失を、上記各張力での波長特性の変動パターンま
たは結合損失と照合することによって、補強後の光ファ
イバカプラの融着延伸部に加わる張力を測定するので、
補強後の光ファイバカプラの融着延伸部にかかる張力を
容易に測定することができる。According to the tension measuring method of the present invention, the intensity of light emitted from each output end is measured while light is incident from one of the input ends of an optical fiber coupler which has been stretched, and the wavelength characteristic of coupling degree or coupling is measured. Measuring the loss, further measuring the wavelength characteristic or coupling loss of the coupling degree by applying various tensions to the optical fiber coupler, and then fixing the optical fiber coupler with a reinforcing member,
By measuring the wavelength characteristic or coupling loss of the degree of coupling for the optical fiber coupler after reinforcement, by comparing the obtained wavelength characteristic or coupling loss with the fluctuation pattern or coupling loss of the wavelength characteristic at each tension described above, Since the tension applied to the fused extension of the optical fiber coupler after reinforcement is measured,
The tension applied to the fusion-stretched portion of the optical fiber coupler after reinforcement can be easily measured.
【０００９】[0009]
【実施例】図１は、本発明にかかる光ファイバカプラの
張力測定方法の一例を説明するための図である。この例
による張力測定方法では、２本の光ファイバ２，３を並
列して２つの可動延伸台７，８に載せ、それぞれファイ
バ固定具９で固定する。また、一方の光ファイバ２の一
端を光源10に接続し、この光ファイバ２に測定光を入射
するとともに、各光ファイバ２，３の他端をそれぞれス
ペクトルアナライザ11,12に接続する。そして双方の光
ファイバ２，３の出射光強度をモニタしながら、２つの
可動延伸台７，８間に配設した酸水素バーナで光ファイ
バ２，３を加熱融着し、２つの可動延伸台７，８を離間
する方向に移動させて加熱融着部分を延伸し、それぞれ
の光ファイバ２，３からの出射光強度の割合（分岐比）
が一定値に達した時点で加熱と延伸を停止し、これによ
って融着延伸部４を形成する。FIG. 1 is a diagram for explaining an example of a method for measuring the tension of an optical fiber coupler according to the present invention. In the tension measuring method according to this example, two optical fibers 2 and 3 are placed in parallel on two movable stretching tables 7 and 8 and fixed by fiber fixing devices 9 respectively. One end of one optical fiber 2 is connected to a light source 10, measurement light is incident on the optical fiber 2, and the other ends of the optical fibers 2 and 3 are connected to spectrum analyzers 11 and 12, respectively. The optical fibers 2 and 3 are heated and fused by an oxyhydrogen burner disposed between the two movable stretching tables 7 and 8 while monitoring the emitted light intensity of both optical fibers 2 and 3. The portions 7 and 8 are moved in the direction in which they are separated from each other, and the heat-sealed portion is stretched.
When the temperature reaches a certain value, the heating and the stretching are stopped, thereby forming the fused stretched portion 4.
【００１０】このように作製した光ファイバカプラ１に
ついて、延伸を停止して張力を加えない状態（張力ゼ
ロ）での結合度の波長特性を測定する。各光ファイバ
２，３の他端に接続したスペクトルアナライザ11,12
は、所定波長域での波長と出射光強度との関係（波長特
性）を測定するためのもので、光ファイバ２の一端から
白色光を入射し、融着延伸部４で分岐され、Ｐ３，Ｐ４
で示す出射端からの出射光の波長特性を測定する。この
出射光の波長特性の測定は、２つの出射端毎に測定して
も良いし、いずれか一方の出射端のみを対象として測定
しても良い。この例では一方の出射端の波長特性を測定
する場合を例示する。With respect to the optical fiber coupler 1 thus manufactured, the wavelength characteristic of the degree of coupling is measured in a state where the stretching is stopped and no tension is applied (zero tension). Spectrum analyzers 11 and 12 connected to the other ends of the optical fibers 2 and 3, respectively.
Is for measuring the relationship (wavelength characteristic) between the wavelength and the output light intensity in a predetermined wavelength range. White light is incident from one end of the optical fiber 2 and is branched by the fusion-stretching section 4, and P3 P4
The wavelength characteristic of the light emitted from the emission end is measured. The measurement of the wavelength characteristic of the outgoing light may be performed for each of two outgoing ends, or may be performed for only one of the outgoing ends. In this example, a case where the wavelength characteristic of one emission end is measured will be described.
【００１１】次いで２つの延伸台７，８を離間方向に移
動させ、一方の延伸台８に張力測定装置13を接続して融
着延伸部４にかかる張力を測定し、融着延伸部４に種々
の張力を加えた状態で、出射光の波長特性を測定する。
このようにして融着延伸部４に各種の張力を加えて得ら
れた波長特性パターンを基に、張力と波長特性との関係
をグラフにすると、例えば図２に示すようなパターンに
なる。Next, the two stretching tables 7 and 8 are moved in the separating direction, and a tension measuring device 13 is connected to one of the stretching tables 8 to measure the tension applied to the fusion stretching section 4. Under various tensions, the wavelength characteristics of the emitted light are measured.
When the relationship between the tension and the wavelength characteristic is graphed based on the wavelength characteristic pattern obtained by applying various tensions to the fusion-stretched portion 4 in this manner, a pattern such as that shown in FIG. 2 is obtained.
【００１２】図２に示すように、結合度の波長特性は、
融着延伸部４に張力が加わると周期パターンにズレを生
じるように変動している。次いでこの光ファイバカプラ
１の融着延伸部４とその周辺部分を補強ケースに入れ、
補強ケース両側に接着剤を注入して硬化させ、補強を行
う。As shown in FIG. 2, the wavelength characteristic of the degree of coupling is
When tension is applied to the fusion-stretched portion 4, the periodic pattern fluctuates so as to shift. Next, the fused extension portion 4 of the optical fiber coupler 1 and its peripheral portion are put in a reinforcing case,
An adhesive is injected into both sides of the reinforcing case to be hardened and reinforced.
【００１３】次いで補強後の光ファイバカプラ１に対し
て同じように結合度の波長特性を測定し、その波長特性
パターンを予め作製しておいた波長特性変動パターンと
照合する。これによって補強後の融着延伸部４にかかる
張力を容易に測定することができる。Next, the wavelength characteristic of the degree of coupling is measured in the same manner for the reinforced optical fiber coupler 1, and the wavelength characteristic pattern is compared with a wavelength characteristic variation pattern that has been prepared in advance. This makes it possible to easily measure the tension applied to the fused and stretched portion 4 after reinforcement.
【００１４】次に、本発明に係る張力測定方法の他の例
を説明する。この例では、図１に示す装置とほぼ同様の
構成の装置を用いて実施でき、光源１０として特定波長
を出射する半導体レーザ光源が使用できる他、スペクト
ルアナライザ11,12に代えて単一波長光測定用のパワー
メータ21,22を用いることができる。Next, another example of the tension measuring method according to the present invention will be described. In this example, the present invention can be implemented using an apparatus having substantially the same configuration as the apparatus shown in FIG. 1, a semiconductor laser light source emitting a specific wavelength can be used as the light source 10, and a single wavelength light source can be used instead of the spectrum analyzers 11 and 12. Power meters 21 and 22 for measurement can be used.
【００１５】この例による張力測定方法では、上述した
例と同様に２本の光ファイバ２，３を融着延伸し、融着
延伸部４を形成して光ファイバカプラ１を形成する。次
いで融着延伸部４の張力がゼロの状態での結合損失を測
定する。結合損失の測定は、光源１０から光ファイバカ
プラの入射端への入射光強度（Ｐ１）から、２つの出射
端からの出射光強度の合計（Ｐ３＋Ｐ４）を減じた値
（即ち、結合損失＝Ｐ１−（Ｐ３＋Ｐ４）である。）。In the tension measuring method according to this embodiment, the two optical fibers 2 and 3 are fusion-stretched and the fusion-stretched portion 4 is formed to form the optical fiber coupler 1 as in the above-described example. Next, the coupling loss in a state where the tension of the fusion-bonded stretching section 4 is zero is measured. The coupling loss is measured by subtracting the sum (P3 + P4) of the output light intensities from the two output ends from the input light intensity (P1) from the light source 10 to the input end of the optical fiber coupler (that is, the coupling loss = P1). − (P3 + P4)).
【００１６】次いで２つの可動延伸台７，８を離間方向
に移動させることによって融着延伸部に一定の張力を加
え、その時の結合損失を測定する。そして張力と結合損
失との関係をグラフ化する。図３はこのように作製され
た張力と結合損失との関係を示すグラフの一例である。
次いでこの光ファイバカプラ１の融着延伸部４とその周
辺部分を補強ケースに入れ、補強ケース両側に接着剤を
注入して硬化させ、融着延伸部の補強を行う。次いで補
強後の光ファイバカプラ１に対して同様に結合損失を測
定し、得られた結合損失値を図３のグラフに照合する。
これによって補強後の融着延伸部４にかかる張力を容易
に測定することができる。Next, a constant tension is applied to the fusion-stretched portion by moving the two movable stretching tables 7 and 8 in the separating direction, and the coupling loss at that time is measured. Then, the relationship between the tension and the coupling loss is graphed. FIG. 3 is an example of a graph showing the relationship between the tension and the coupling loss thus produced.
Next, the fusion-stretched portion 4 of the optical fiber coupler 1 and its peripheral portion are placed in a reinforcing case, and an adhesive is injected into both sides of the reinforcing case and cured to reinforce the fusion-stretched portion. Next, the coupling loss is similarly measured for the reinforced optical fiber coupler 1, and the obtained coupling loss value is compared with the graph of FIG.
This makes it possible to easily measure the tension applied to the fused and stretched portion 4 after reinforcement.
【００１７】また、光ファイバカプラ１に光を入射し
て、単一波長での結合損失や出射光強度を測定し、張力
と結合損失または出射光強度の関係を求め、その関係か
ら補強後の融着延伸部に加わる張力を測定する方法とし
ては、上述した例の他、 （Ｐ１−Ｐ３）の損失を求める方法。 （Ｐ１−Ｐ４）の損失を求める方法。 （Ｐ３−Ｐ４）又は（Ｐ４−Ｐ３）の差を求める方
法。 張力とＰ３（出射光強度）との関係を求める方法。 張力とＰ４（出射光強度）との関係を求める方法。 などを用いても、同様に補強後の融着延伸部の張力を測
定することができる。このように単一波長での結合損失
や出射光強度を測定する場合には、測定波長によっては
その値がゼロであったり、100％付近となって、補強後
の変化を測定し難い場合があるので、延伸作業の終了か
ら補強終了（接着剤の固化終了）まで継続して測定する
のが望ましい。Light is incident on the optical fiber coupler 1 to measure the coupling loss or the intensity of the emitted light at a single wavelength, to determine the relationship between the tension and the coupling loss or the intensity of the emitted light. As a method of measuring the tension applied to the fusion-bonded stretched section, in addition to the above-described example, a method of determining the loss of (P1-P3). A method for determining the loss of (P1-P4). A method of calculating the difference of (P3-P4) or (P4-P3). A method for determining the relationship between tension and P3 (intensity of emitted light). A method for determining the relationship between tension and P4 (emission light intensity). Even if such a method is used, the tension of the fused and stretched portion after reinforcement can be measured in the same manner. When measuring the coupling loss or the output light intensity at a single wavelength in this way, the value may be zero or close to 100% depending on the measurement wavelength, making it difficult to measure the change after reinforcement. Therefore, it is desirable to measure continuously from the end of the stretching operation to the end of the reinforcement (the end of the solidification of the adhesive).
【００１８】なお、この実施例では、２本の光ファイバ
２，３から構成された光ファイバカプラにおける張力測
定方法を例示したが、３本以上の光ファイバを用いたカ
プラにおける張力測定に適用することも可能である。In this embodiment, a method for measuring a tension in an optical fiber coupler composed of two optical fibers 2 and 3 has been exemplified. However, the present invention is applied to a tension measurement in a coupler using three or more optical fibers. It is also possible.
【００１９】[0019]
【発明の効果】以上説明したように、本発明による光フ
ァイバカプラの張力測定方法は、延伸を終えた光ファイ
バカプラの入射端の１つから光を入射しつつ、各出射端
からの出射光強度を測定して結合度の波長特性または結
合損失を測定し、さらに該光ファイバカプラに種々の張
力を加えて結合度の波長特性または結合損失を測定し、
次いで該光ファイバカプラを補強部材で固定し、補強後
の光ファイバカプラについて結合度の波長特性または結
合損失を測定し、ここで得られた波長特性または結合損
失を、上記各張力での波長特性の変動パターンまたは結
合損失と照合することによって、補強後の光ファイバカ
プラの融着延伸部に加わる張力を測定するので、補強後
の光ファイバカプラの融着延伸部にかかる張力を容易に
測定することができる。従って、補強後に加わる張力を
考慮してそれを補償するように補強操作を実施したり、
好適な接着剤の選択などの張力調整処置が可能となり、
補強後の張力の影響を少なくして高特性の光ファイバカ
プラを作製することができる。As described above, according to the method for measuring the tension of an optical fiber coupler according to the present invention, the light emitted from each of the outgoing ends while the light enters from one of the incident ends of the optical fiber coupler that has been extended. Measure the intensity to measure the wavelength characteristic or coupling loss of the degree of coupling, further measure the wavelength characteristic or coupling loss of the degree of coupling by applying various tensions to the optical fiber coupler,
Next, the optical fiber coupler is fixed with a reinforcing member, and the wavelength characteristic or coupling loss of the degree of coupling of the optical fiber coupler after reinforcement is measured. Since the tension applied to the fused extension of the optical fiber coupler after reinforcement is measured by comparing the variation pattern or the coupling loss of the optical fiber coupler, the tension applied to the fusion extended portion of the optical fiber coupler after reinforcement can be easily measured. be able to. Therefore, taking into account the tension applied after reinforcement and performing reinforcement operations to compensate for it,
Tension adjustment treatment such as selection of a suitable adhesive becomes possible,
An optical fiber coupler having high characteristics can be manufactured by reducing the influence of the tension after reinforcement.
【図面の簡単な説明】[Brief description of the drawings]
【図１】 本発明に係る光ファイバカプラの張力測定方
法を実施するのに好適なカプラ製造装置を示す構成図で
ある。FIG. 1 is a configuration diagram showing a coupler manufacturing apparatus suitable for implementing a method for measuring the tension of an optical fiber coupler according to the present invention.
【図２】 光ファイバカプラに加わる張力と結合度の波
長特性パターンとの関係を示すグラフである。FIG. 2 is a graph showing a relationship between a tension applied to an optical fiber coupler and a wavelength characteristic pattern of a coupling degree.
【図３】 光ファイバカプラに加わる張力と結合損失の
関係を示すグラフである。FIG. 3 is a graph showing a relationship between a tension applied to an optical fiber coupler and a coupling loss.
【図４】 融着延伸形光ファイバカプラの一例を示す平
面図である。FIG. 4 is a plan view showing an example of a fusion drawn optical fiber coupler.
１…光ファイバカプラ、２,３…光ファイバ、４…融着
延伸部、５…補強ケース、６…接着剤、７,８…可動延
伸台、１０…光源、１１,１２…スペクトルアナライ
ザ、２１,２２…パワーメータDESCRIPTION OF SYMBOLS 1 ... Optical fiber coupler, 2,3 ... Optical fiber, 4 ... Fused-fusion part, 5 ... Reinforcement case, 6 ... Adhesive, 7,8 ... Movable stretching table, 10 ... Light source, 11,12 ... Spectrum analyzer, 21 , 22… Power meter
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 平３−267903（ＪＰ，Ａ) 特開 昭64−44407（ＪＰ，Ａ) 特開 昭63−125906（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) G01L 5/00 G02B 6/28 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-3-267903 (JP, A) JP-A-64-44407 (JP, A) JP-A-63-125906 (JP, A) (58) Investigation Field (Int.Cl. 7 , DB name) G01L 5/00 G02B 6/28
Claims (2)
延伸して融着延伸部を形成し、該融着延伸部で光を分
岐、結合する光ファイバカプラの張力測定方法であっ
て、延伸を終えた光ファイバカプラの入射端の１つから
光を入射しつつ、各出射端からの出射光強度を測定して
結合度の波長特性を測定し、さらに該光ファイバカプラ
に種々の張力を加えて結合度の波長特性を測定して各張
力での波長特性の変動パターンを求めておき、次いで該
光ファイバカプラを補強部材で固定し、補強後の光ファ
イバカプラについて結合度の波長特性を測定し、ここで
得られた波長特性を、上記各張力での波長特性の変動パ
ターンと照合することによって、補強後の光ファイバカ
プラの融着延伸部に加わる張力を測定することを特徴と
する光ファイバカプラの張力測定方法。1. A method for heating and fusing a part of a plurality of optical fibers.
A method for measuring the tension of an optical fiber coupler that stretches to form a fusion-spliced portion, branches and couples light at the fusion-stretched portion, and emits light from one of the incident ends of the stretched optical fiber coupler. While being incident, the wavelength characteristics of the degree of coupling are measured by measuring the intensity of light emitted from each of the exit ends, and various tensions are applied to the optical fiber coupler to measure the wavelength characteristics of the degree of coupling, and the wavelength characteristics of the degree of coupling are measured. A variation pattern of the wavelength characteristic is obtained in advance, the optical fiber coupler is fixed with a reinforcing member, and the wavelength characteristic of the degree of coupling of the reinforced optical fiber coupler is measured. And measuring a tension applied to a fusion-stretched portion of the reinforced optical fiber coupler by comparing with a variation pattern of wavelength characteristics in the optical fiber coupler.
延伸して融着延伸部を形成し、該融着延伸部で光を分
岐、結合する光ファイバカプラの張力測定方法であっ
て、延伸を終えた光ファイバカプラの入射端の１つから
光を入射しつつ、各出射端からの出射光強度を測定し、
入射光強度から出射光強度を差し引いて結合損失率を測
定し、さらに該光ファイバカプラに種々の張力を加えて
結合損失を測定し、張力と結合損失との関係を求め、次
いで該光ファイバカプラを補強部材で固定し、補強後の
光ファイバカプラについて結合損失を測定し、ここで得
られた結合損失を、上記張力と結合損失との関係に照合
することによって、補強後の光ファイバカプラの融着延
伸部に加わる張力を測定することを特徴とする光ファイ
バカプラの張力測定方法。2. A method for heating and fusing a part of a plurality of optical fibers.
A method for measuring the tension of an optical fiber coupler that stretches to form a fusion-spliced portion, branches and couples light at the fusion-stretched portion, and emits light from one of the incident ends of the stretched optical fiber coupler. While entering, measure the intensity of light emitted from each output end,
The coupling loss rate is measured by subtracting the output light intensity from the incident light intensity, the coupling loss is measured by further applying various tensions to the optical fiber coupler, and the relationship between the tension and the coupling loss is determined. Is fixed with a reinforcing member, the coupling loss of the reinforced optical fiber coupler is measured, and the obtained coupling loss is compared with the relationship between the tension and the coupling loss to thereby obtain the reinforced optical fiber coupler. A method for measuring the tension of an optical fiber coupler, comprising measuring a tension applied to a fusion-stretched portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04009506A JP3102816B2 (en) | 1992-01-22 | 1992-01-22 | Optical fiber coupler tension measurement method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP04009506A JP3102816B2 (en) | 1992-01-22 | 1992-01-22 | Optical fiber coupler tension measurement method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH05196514A JPH05196514A (en) | 1993-08-06 |
| JP3102816B2 true JP3102816B2 (en) | 2000-10-23 |
Family
ID=11722135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP04009506A Expired - Fee Related JP3102816B2 (en) | 1992-01-22 | 1992-01-22 | Optical fiber coupler tension measurement method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3102816B2 (en) |
-
1992
- 1992-01-22 JP JP04009506A patent/JP3102816B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH05196514A (en) | 1993-08-06 |
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