JPH08101323A - Polarization maintaining optical fiber - Google Patents
Polarization maintaining optical fiberInfo
- Publication number
- JPH08101323A JPH08101323A JP6237188A JP23718894A JPH08101323A JP H08101323 A JPH08101323 A JP H08101323A JP 6237188 A JP6237188 A JP 6237188A JP 23718894 A JP23718894 A JP 23718894A JP H08101323 A JPH08101323 A JP H08101323A
- Authority
- JP
- Japan
- Prior art keywords
- optical fiber
- maintaining optical
- stress
- polarization
- polarization maintaining
- 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
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
- C03B37/01—Manufacture of glass fibres or filaments
- C03B37/012—Manufacture of preforms for drawing fibres or filaments
- C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
- C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
- C03B37/01217—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube for making preforms of polarisation-maintaining optical fibres
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
- C03B2203/00—Fibre product details, e.g. structure, shape
- C03B2203/30—Polarisation maintaining [PM], i.e. birefringent products, e.g. with elliptical core, by use of stress rods, "PANDA" type fibres
- C03B2203/31—Polarisation maintaining [PM], i.e. birefringent products, e.g. with elliptical core, by use of stress rods, "PANDA" type fibres by use of stress-imparting rods, e.g. by insertion
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明はコーヒレントな光を用い
た光通信、光センサなどに用いられる応力付与型の偏波
保持光ファイバに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stress imparting type polarization maintaining optical fiber used for optical communication using coherent light, an optical sensor and the like.
【０００２】[0002]
【従来の技術】周知のとおり、偏波保持光ファイバは、
基本モードを構成するＥX モード、Ｅ Yモード（直交二
軸方向）の位相差を、外乱による位相差よりも大きくし
て、所定の偏波面を保存するようにしたものである。偏
波保持光ファイバの一つとして、応力による複屈折現象
を利用した応力付与型偏波保持光ファイバがある。この
偏波保持光ファイバの場合は、コアに応力を付与するこ
とで、偏波面の保存をはかっている。As is well known, a polarization maintaining optical fiber is
E that constitutes the basic modeXMode, E YMode (orthogonal two
The phase difference in the (axial direction) is made larger than the phase difference due to disturbance.
Thus, the predetermined plane of polarization is preserved. side
Birefringence phenomenon due to stress as one of wave-holding optical fibers
There is a stress-imparting polarization maintaining optical fiber utilizing the. this
In the case of polarization-maintaining optical fiber, stress should be applied to the core.
And, we are trying to preserve the plane of polarization.
【０００３】応力付与型の偏波保持光ファイバをつくる
とき、図３に示すようにガラス母材段階におけるクラッ
ド用ガラス母材１１の所定位置（コア用ガラス母材１２
を挟む位置）に二つの孔１３を開けてこれらの各孔１３
に棒状の応力付与部用母材１４を挿入して、この応力付
与部用母材１４を含む偏波保持光ファイバ用ガラス母材
１５を周知の加熱延伸手段により線引きして図４に示す
コア１の外周のクラッド３にコア１を挟むように応力付
与部２Ｂを有する偏波保持光ファイバＢを製作するのが
一般的である。When a stress-applying polarization-maintaining optical fiber is manufactured, as shown in FIG. 3, a predetermined position of the glass preform 11 for cladding (glass preform 12 for core) is formed at the glass preform stage.
2 holes 13 are formed at positions where the
The rod-shaped stress applying portion base material 14 is inserted into the core, and the polarization maintaining optical fiber glass base material 15 including the stress applying portion base material 14 is drawn by a well-known heating and drawing means to show the core shown in FIG. It is common to manufacture a polarization maintaining optical fiber B having a stress applying portion 2B so that the core 1 is sandwiched between the clads 3 on the outer periphery of 1.
【０００４】応力付与部２Ｂは図５に示すようにＳｉＯ
2 ─Ｂ2 Ｏ3 の成分が均一なガラスで構成されている。
Ｂ2 Ｏ3 はＳｉＯ2 と比較すると熱膨張率が大きい。こ
のため応力付与部用母材１４を含む偏波保持光ファイバ
用ガラス母材１５を高温にて加熱延伸して光ファイバと
したのちに該光ファイバが常温まで冷却されると応力付
与部２Ｂからコア１に向かって応力が付与され、この応
力によりコア１にて複屈折が発生し偏波保持特性が得ら
れる。この際、Ｂ2 Ｏ3 濃度が高いほどコア１に加わる
応力が大きくなり、その結果複屈折特性が向上する。The stress applying portion 2B is made of SiO 2 as shown in FIG.
The composition of 2 --B 2 O 3 is composed of a uniform glass.
B 2 O 3 has a large coefficient of thermal expansion as compared with SiO 2 . Therefore, when the polarization maintaining optical fiber glass base material 15 including the stress applying part base material 14 is heated and drawn at a high temperature to form an optical fiber and then the optical fiber is cooled to room temperature, the stress applying part 2B is removed. A stress is applied to the core 1, and the stress causes birefringence in the core 1 to obtain polarization maintaining characteristics. At this time, the higher the B 2 O 3 concentration, the larger the stress applied to the core 1, and as a result, the birefringence characteristic is improved.
【０００５】[0005]
【発明が解決しようとする課題】応力付与部２Ｂはコア
１に対して応力を付与するのと同様に、応力付与部２Ｂ
とクラッド３間にも強く応力をかけている。このため、
Ｂ2 Ｏ3 の濃度を上げて良好な複屈折特性を得ようとす
ると応力が応力付与部２Ｂとクラッド３との間にも集中
してしまうことになる。また、応力付与部２Ｂとクラッ
ド３との界面にＢ 2 Ｏ3 が多量に含まれていると偏波保
持光ファイバ用ガラス母材１５から偏波保持光ファイバ
Ｂを得るべく加熱延伸する際に応力付与部２Ｂとクラッ
ド３との界面に発泡が生じる原因にもなっていた。The stress applying portion 2B is a core.
In the same manner as stress is applied to 1, the stress applying portion 2B
A strong stress is also applied between the clad 3 and the clad 3. For this reason,
B2O3Try to obtain good birefringence characteristics by increasing the concentration of
Then, stress concentrates also between the stress applying part 2B and the clad 3.
Will be done. In addition, the stress applying portion 2B and the
B at the interface with D3 2O3If a large amount of
Polarization-maintaining optical fiber from glass preform 15 for optical fiber holding
When heating and stretching to obtain B, the stress applying portion 2B and the
It was also a cause of foaming at the interface with the cord 3.
【０００６】上述したような現象により、偏波保持光フ
ァイバＢの端末を光コネクタ付け等のために研磨すると
応力付与部２Ｂにクラックが発生し、結果として複屈折
特性の劣化が発生する。Due to the above-mentioned phenomenon, when the end of the polarization-maintaining optical fiber B is polished for attaching an optical connector or the like, a crack is generated in the stress applying portion 2B, and as a result, the birefringence characteristic is deteriorated.
【０００７】本発明は上記の課題を解決し、光コネクタ
付け等のための端面研磨の際、応力付与部にクラックが
発生することなく良好な複屈折特性が保てる偏波保持フ
ァイバを提供することを目的とするものである。The present invention solves the above problems and provides a polarization-maintaining fiber capable of maintaining good birefringence characteristics without cracks in the stress-applying portion during polishing of an end face for attaching an optical connector or the like. The purpose is.
【０００８】[0008]
【課題を解決するための手段】本発明は上記の課題を解
決するために以下のような手段を有している。The present invention has the following means in order to solve the above problems.
【０００９】本発明のうち請求項１の偏波保持光ファイ
バは、偏波保持光ファイバのコア外周のクラッドに前記
コアを挟むように応力付与部が設けられた偏波保持光フ
ァイバであって、前記応力付与部材はＢ2 Ｏ3 の濃度が
中心ほど高くなった濃度分布を有することを特徴とす
る。The polarization-maintaining optical fiber according to claim 1 of the present invention is a polarization-maintaining optical fiber in which a stress imparting portion is provided so as to sandwich the core in a clad on the outer periphery of the core of the polarization-maintaining optical fiber. The stress-applying member has a concentration distribution in which the concentration of B 2 O 3 is higher toward the center.
【００１０】本発明のうち請求項２の偏波保持光ファイ
バは、クラッドと接する応力付与部の外周部のＢ2 Ｏ3
の濃度が１５％以下であることを特徴とする。In the polarization maintaining optical fiber according to claim 2 of the present invention, B 2 O 3 in the outer peripheral portion of the stress applying portion in contact with the clad is provided.
Is less than 15%.
【００１１】本発明のうち請求項３の偏波保持光ファイ
バは、応力付与部のＢ2 Ｏ3 の平均濃度が約２０％であ
ることを特徴とする。The polarization maintaining optical fiber according to claim 3 of the present invention is characterized in that the average concentration of B 2 O 3 in the stress applying portion is about 20%.
【００１２】[0012]
【作用】本発明のうち請求項１ないし請求項３の偏波保
持光ファイバによれば、偏波保持光ファイバのコア外周
のクラッドにコアを挟むようにＢ2 Ｏ3 の濃度が中心ほ
ど高くなった濃度分布を有している応力付与部が設けら
れているので、コア対する応力は充分に有するととも
に、応力付与部の外周のクラッドに対しては応力付与部
は外周辺部のＢ2 Ｏ3 の濃度が低くなっているので応力
付与部と外周のクラッドの熱膨張率が近づき応力が応力
付与部とクラッドとの間に集中することがなくなる。ま
た、応力付与部とクラッドとの界面のＢ2 Ｏ3 が低くな
っているので偏波保持光ファイバ用ガラス母材から偏波
保持光ファイバに加熱延伸する際に応力付与部とクラッ
ドとの界面に生じていた発泡が少なくなり、偏波保持光
ファイバの端面を研磨すると発生していた応力付与部の
クラックが少なくなり、複屈折特性が劣化するという現
象が解消する。According to the polarization-maintaining optical fiber of the present invention, the concentration of B 2 O 3 is higher toward the center so that the core is sandwiched by the cladding around the core of the polarization-maintaining optical fiber. Since the stress-applying part having a different concentration distribution is provided, the core has sufficient stress, and the stress-applying part has a B 2 O content in the outer peripheral part with respect to the clad on the outer periphery of the stress-applying part. Since the concentration of 3 is low, the coefficients of thermal expansion of the stress-applying part and the clad on the outer periphery are close to each other, and the stress is not concentrated between the stress-applying part and the clad. Further, since B 2 O 3 at the interface between the stress applying part and the clad is low, the interface between the stress applying part and the clad is heated and drawn from the glass preform for the polarization maintaining optical fiber to the polarization maintaining optical fiber. This reduces the amount of foaming that has occurred, reduces the number of cracks in the stress-applying portion that occur when the end face of the polarization-maintaining optical fiber is polished, and eliminates the phenomenon that the birefringence characteristics deteriorate.
【００１３】本発明のうち請求項２の偏波保持光ファイ
バによれば、クラッドと接する応力付与部の外周部のＢ
2 Ｏ3 の濃度が１５％以下であるので、コネクタ付けの
際の端面研磨などによるクラックの発生がなく、また複
屈折特性の劣化も起こらない偏波保持ファイバを製作す
ることが出来る。According to the polarization-maintaining optical fiber of the second aspect of the present invention, B of the outer peripheral portion of the stress-applying portion in contact with the clad is provided.
Since the concentration of 2 O 3 is 15% or less, it is possible to manufacture a polarization-maintaining fiber in which no cracks are generated due to polishing of the end face when attaching a connector and the birefringence characteristic is not deteriorated.
【００１４】[0014]
【実施例】以下に本発明を実施例により詳細に説明す
る。なお、従来のものと同様のものについては従来のも
のと同符号を付して詳細な説明は省略する。The present invention will be described below in detail with reference to examples. The same parts as those of the conventional one are designated by the same reference numerals and detailed description thereof will be omitted.
【００１５】図１に本発明の偏波保持光ファイバＡの構
成を示す。偏波保持光ファイバＡはコア１の外周のクラ
ッド３にコア１を挟むように応力付与部２を有する。本
発明の偏波保持光ファイバＡの特徴は応力付与部２のＢ
2 Ｏ3 の濃度が均一でなく図２に示すように応力付与部
２の中心ほど高くなった濃度分布を有している点にあ
る。FIG. 1 shows the configuration of the polarization maintaining optical fiber A of the present invention. The polarization-maintaining optical fiber A has a stress imparting portion 2 in a clad 3 on the outer periphery of the core 1 so as to sandwich the core 1. The polarization-maintaining optical fiber A of the present invention is characterized by B of the stress applying section 2.
The point is that the concentration of 2 O 3 is not uniform and has a concentration distribution that becomes higher toward the center of the stress applying portion 2 as shown in FIG.
【００１６】本発明の偏波保持光ファイバＡは従来と同
様、図３に示すようにガラス母材段階におけるクラッド
用ガラス母材１１の所定位置（コア用ガラス母材１２を
挟む位置）に二つの孔１３を開けてこれらの各孔１３に
棒状の応力付与部母材１４を挿入して、この応力付与部
母材１４を含む偏波保持光ファイバ用ガラス母材１５を
周知の加熱延伸手段により線引きしてコア１の外周のク
ラッド３にコア１を挟むように応力付与部２を有する偏
波保持光ファイバＡを製作する。As in the conventional case, the polarization-maintaining optical fiber A of the present invention is provided at a predetermined position (a position sandwiching the core glass preform 12) of the cladding glass preform 11 in the glass preform stage as shown in FIG. One hole 13 is opened and a rod-shaped stress applying part base material 14 is inserted into each of these holes 13, and a polarization preserving optical fiber glass base material 15 including the stress applying part base material 14 is well-known heating and stretching means. A polarization-maintaining optical fiber A having a stress applying portion 2 so as to sandwich the core 1 in the clad 3 on the outer periphery of the core 1 is manufactured.
【００１７】本発明の偏波保持光ファイバＡの効果を調
べるために以下のような実験をおこなった。偏波保持光
ファイバＡを製作するにあたって、クラッド用ガラス母
材１１の所定の位置（コア用ガラス母材１２を挟む位
置）の二つの孔１３に挿入する応力付与部用母材１４を
９種類用意した。The following experiment was conducted to investigate the effect of the polarization-maintaining optical fiber A of the present invention. When manufacturing the polarization-maintaining optical fiber A, nine types of stress-applying part base materials 14 to be inserted into two holes 13 at predetermined positions (positions sandwiching the core glass base material 12) of the cladding glass base material 11 are manufactured. I prepared.
【００１８】９種類の応力付与部用母材１４はそれぞれ
平均のＢ2 Ｏ3 濃度がすべて２０(wt%) 一定とし、濃度
分布のみを表１の様に変化させたもので、これらの応力
付与部用母材１４を用いて９種類の偏波保持光ファイバ
Ａ１〜Ａ９を製作した。この作製にあたってクラッド用
ガラス母材１１の孔あけ位置及び穴径はまったく同一と
した。また、ファイバ化の条件もまったく同一として、
応力付与部のＢ 2 Ｏ3 の分布のみ異なるものとした。The nine types of base material 14 for the stress applying portion are respectively
Average B2O3The concentration is fixed at 20 (wt%), and the concentration
Only the distribution is changed as shown in Table 1, and these stresses
Nine kinds of polarization-maintaining optical fibers using the base material 14 for the applying part
A1 to A9 were manufactured. For this production
The drilling position and hole diameter of the glass base material 11 are exactly the same.
did. Also, assuming that the fiberization conditions are exactly the same,
B of stress applying part 2O3Only the distribution of is different.
【００１９】これら９種類の偏波保持光ファイバの複屈
折特性を評価するため各光ファイバＡ１〜Ａ９のクロス
トーク値を測定した。なお、クロストーク値とは光ファ
イバにＸ偏波（またはＹ偏波）を入力した際の各偏波面
からの出力比である。その結果得られたクロストーク値
を表１に示す。この結果からＢ2 Ｏ3 の濃度分布を変化
させても応力付与部２断面における平均的なＢ2 Ｏ3 濃
度が変わらなければクロストーク値が変わらないこと、
即ち複屈折特性にそれほど影響を与えないことがわか
る。The crosstalk values of the optical fibers A1 to A9 were measured in order to evaluate the birefringence characteristics of these nine types of polarization maintaining optical fibers. The crosstalk value is an output ratio from each polarization plane when X polarization (or Y polarization) is input to the optical fiber. The crosstalk values obtained as a result are shown in Table 1. From this result, even if the B 2 O 3 concentration distribution is changed, the crosstalk value does not change unless the average B 2 O 3 concentration in the cross section of the stress applying portion 2 changes.
That is, it can be seen that the birefringence characteristics are not so affected.
【００２０】次に、これら９種類の偏波保持光ファイバ
Ａ１〜Ａ９の各端部を研磨した後にコネクタ付けを行っ
た。コネクタ付け後の応力付与部２外周部およびクラッ
ド３との界面部のクラック発生率を表１に示す。この結
果から応力付与部２外周部のＢ2 Ｏ3 の濃度が高いとク
ラックが発生しやすい傾向があり、特に応力付与部２外
周部のＢ2 Ｏ3 の濃度を１５ (wt%)以下としたものでは
全くクラックは発生しなくなっているのがわかる。Next, each of the nine types of polarization-maintaining optical fibers A1 to A9 was ground and then attached to a connector. Table 1 shows the crack occurrence rates at the outer peripheral portion of the stress applying portion 2 and the interface portion with the clad 3 after the connector is attached. From these results, when the concentration of B 2 O 3 on the outer peripheral portion of the stress applying portion 2 is high, cracks are likely to occur, and particularly, the concentration of B 2 O 3 on the outer peripheral portion of the stress applying portion 2 is 15 (wt%) or less. It can be seen that cracks did not occur at all with the one that was done.
【００２１】[0021]
【表１】 [Table 1]
【００２２】発泡はクラックが発生したもののうち５つ
の偏波保持光ファイバにのみクラック部付近に認めら
れ、クラックが発生しなかった偏波保持光ファイバでは
認められなかった。この結果、発泡がクラック発生の主
な原因であることがわかる。また、コネクタ付け後のク
ロストーク値の平均を比較したところ表１のようになり
クラックが発生しやすい偏波保持光ファイバほどコネク
タ付けで劣化していることがわかった。Foaming was observed only in five polarization-maintaining optical fibers among the cracked ones, and not in the polarization-maintaining optical fibers in which no cracking occurred. As a result, it is found that foaming is the main cause of cracks. Further, when the averages of the crosstalk values after the connector was attached were compared, the results are as shown in Table 1, and it was found that the polarization maintaining optical fiber that is more susceptible to cracks is deteriorated by attaching the connector.
【００２３】以上のように応力付与部２のＢ2 Ｏ3 の濃
度を中心ほど高くなった濃度分布とすることによりクラ
ックの発生の原因となる発泡が減少した偏波保持光ファ
イバを製作することが出来る。As described above, by making the concentration distribution of B 2 O 3 in the stress applying portion 2 higher toward the center, it is possible to manufacture a polarization-maintaining optical fiber in which foaming causing cracks is reduced. Can be done.
【００２４】また、応力付与部２のＢ2 Ｏ3 の濃度を平
均２０(wt%) 、外周部１５(wt%) 以下とすることにより
コネクタ付けによるクラックの発生がなく、また複屈折
特性の劣化も起こらない偏波保持ファイバを製作するこ
とが出来る。Further, by setting the concentration of B 2 O 3 in the stress applying portion 2 to 20 (wt%) on average and 15 (wt%) or less on the outer peripheral portion, no crack is generated due to the attachment of the connector, and the birefringence characteristic A polarization-maintaining fiber that does not deteriorate can be manufactured.
【００２５】[0025]
【発明の効果】以上述べたように、本発明の請求項１な
いし請求項３の偏波保持光ファイバによれば、偏波保持
光ファイバのコア外周のクラッドにコアを挟むようにＢ
2 Ｏ3の濃度が中心ほど高くなった濃度分布を有してい
る応力付与部が設けられているので、コアに対する応力
は充分に有するとともに、応力付与部の外周のクラッド
に対しては応力付与部は外周辺部のＢ2 Ｏ3 の濃度が低
くなっているので応力付与部と外周のクラッドの熱膨張
率が近づき応力が応力付与部とクラッドとの間に集中す
ることがなくなる。As described above, according to the polarization-maintaining optical fiber of claims 1 to 3 of the present invention, the core is sandwiched between the clads around the core of the polarization-maintaining optical fiber.
Since the stress applying part has a concentration distribution in which the concentration of 2 O 3 is higher toward the center, it has sufficient stress on the core and stress is applied to the cladding on the outer periphery of the stress applying part. Since the concentration of B 2 O 3 in the outer peripheral portion of the portion is low, the thermal expansion coefficients of the stress-applying portion and the outer cladding are close to each other, and stress is not concentrated between the stress-applying portion and the cladding.
【００２６】また、応力付与部とクラッドとの界面のＢ
2 Ｏ3 が低くなっているので偏波保持光ファイバ用ガラ
ス母材から偏波保持光ファイバに加熱延伸する際に応力
付与部とクラッドとの界面に生じていた発泡が少なくな
った。その結果偏波保持光ファイバの端面を研磨すると
発生していた応力付与部のクラックが少なくなり、複屈
折特性が劣化するという現象が解消する。In addition, B at the interface between the stress applying portion and the clad
Since the content of 2 O 3 is low, the foaming generated at the interface between the stress-applying portion and the clad when the glass preform for the polarization maintaining optical fiber is heated and drawn to the polarization maintaining optical fiber is reduced. As a result, the number of cracks in the stress-applying portion that have occurred when the end face of the polarization-maintaining optical fiber is polished is reduced, and the phenomenon that the birefringence characteristic is deteriorated is eliminated.
【００２７】本発明のうち請求項２の偏波保持光ファイ
バによれば、クラッドと接する応力付与部の外周部のＢ
2 Ｏ3 の濃度が１５％以下であるので、コネクタ付けに
よるクラックの発生がなく、また複屈折特性の劣化も起
こらない偏波保持ファイバを製作することが出来る。According to the polarization maintaining optical fiber of the second aspect of the present invention, B of the outer peripheral portion of the stress applying portion in contact with the clad is provided.
Since the concentration of 2 O 3 is 15% or less, it is possible to manufacture a polarization-maintaining fiber that does not cause cracks due to connector attachment and does not cause deterioration of birefringence characteristics.
【図１】本発明の偏波保持光ファイバの一実施例を示す
構成図である。FIG. 1 is a configuration diagram showing an embodiment of a polarization maintaining optical fiber of the present invention.
【図２】図１の偏波保持光ファイバの応力付与部のＢ2
Ｏ3 の濃度分布図である。FIG. 2 is B 2 of a stress applying portion of the polarization maintaining optical fiber of FIG.
It is a concentration distribution diagram of O 3 .
【図３】本発明の偏波保持光ファイバ用ガラス母材を示
す構成図である。FIG. 3 is a configuration diagram showing a glass preform for a polarization maintaining optical fiber of the present invention.
【図４】従来の偏波保持光ファイバの一例を示す構成図
である。FIG. 4 is a configuration diagram showing an example of a conventional polarization maintaining optical fiber.
【図５】図４の偏波保持光ファイバの応力付与部のＢ2
Ｏ3 の濃度分布図である。5] B 2 of the stress applying portion of the polarization maintaining optical fiber of FIG.
It is a concentration distribution diagram of O 3 .
１ コア ２ 応力付与部 ３ クラッド Ａ 偏波保持光ファイバ 1 core 2 stress applying part 3 clad A polarization maintaining optical fiber
Claims (3)
ドに前記コアを挟むように応力付与部が設けられた偏波
保持光ファイバであって、前記応力付与部はＢ2 Ｏ3 の
濃度が中心ほど高くなった濃度分布を有することを特徴
とする偏波保持光ファイバ。1. A polarization-maintaining optical fiber, wherein a stress-applying portion is provided in a clad on the outer periphery of the core of the polarization-maintaining optical fiber so as to sandwich the core, and the stress-applying portion has a B 2 O 3 concentration of A polarization-maintaining optical fiber having a concentration distribution that is higher toward the center.
のＢ2 Ｏ3 の濃度が１５％以下であることを特徴とする
請求項１記載の偏波保持光ファイバ。2. The polarization-maintaining optical fiber according to claim 1, wherein the concentration of B 2 O 3 on the outer periphery of the stress applying portion in contact with the clad is 15% or less.
０％であることを特徴とする請求項１または請求項２記
載の偏波保持光ファイバ。 3. The average concentration of B 2 O 3 in the stress applying portion is about 2
It is 0%, The polarization maintaining optical fiber of Claim 1 or Claim 2 characterized by the above-mentioned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6237188A JP2895758B2 (en) | 1994-09-30 | 1994-09-30 | Polarization-maintaining optical fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6237188A JP2895758B2 (en) | 1994-09-30 | 1994-09-30 | Polarization-maintaining optical fiber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08101323A true JPH08101323A (en) | 1996-04-16 |
| JP2895758B2 JP2895758B2 (en) | 1999-05-24 |
Family
ID=17011684
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6237188A Expired - Fee Related JP2895758B2 (en) | 1994-09-30 | 1994-09-30 | Polarization-maintaining optical fiber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2895758B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1225457A1 (en) * | 2001-01-17 | 2002-07-24 | Fujikura Ltd. | Optical fiber for preserving plane of polarization |
| CN105293892A (en) * | 2015-12-04 | 2016-02-03 | 中国电子科技集团公司第四十六研究所 | Wire drawing method of high-stress active polarization-maintaining fiber prefabricated rod |
-
1994
- 1994-09-30 JP JP6237188A patent/JP2895758B2/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1225457A1 (en) * | 2001-01-17 | 2002-07-24 | Fujikura Ltd. | Optical fiber for preserving plane of polarization |
| US6687442B2 (en) | 2001-01-17 | 2004-02-03 | Fujikura Ltd. | Optical fiber for preserving plane of polarization |
| CN105293892A (en) * | 2015-12-04 | 2016-02-03 | 中国电子科技集团公司第四十六研究所 | Wire drawing method of high-stress active polarization-maintaining fiber prefabricated rod |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2895758B2 (en) | 1999-05-24 |
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