JP2001244535A - Polarization maintaining optical amplification fiber - Google Patents
Polarization maintaining optical amplification fiberInfo
- Publication number
- JP2001244535A JP2001244535A JP2000054647A JP2000054647A JP2001244535A JP 2001244535 A JP2001244535 A JP 2001244535A JP 2000054647 A JP2000054647 A JP 2000054647A JP 2000054647 A JP2000054647 A JP 2000054647A JP 2001244535 A JP2001244535 A JP 2001244535A
- Authority
- JP
- Japan
- Prior art keywords
- edf
- wavelength
- polarization maintaining
- fiber
- stress applying
- 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
Landscapes
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Lasers (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、偏波保持特性と
光増幅作用を併せ持ち、光増幅の励起光の波長が９８０
ｎｍである偏波保持光増幅用ファイバに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has both a polarization maintaining characteristic and an optical amplifying function, and the wavelength of the pump light for optical amplification is 980.
The present invention relates to a polarization maintaining optical amplification fiber having a wavelength of nm.
【０００２】[0002]
【従来の技術】超高速光通信の可能性が検討されるにつ
れ、コアにエルビウムをドープした光増幅作用を有する
エルビウムドープ光ファイバ（以下、ＥＤＦと言う。）
を使用した光ファイバ増幅器や光ファイバレーザーにお
いて、ＥＤＦ内の偏波に起因する種々の問題が生じてい
る。このような問題を解決するために、偏波保持特性を
有するＥＤＦ，偏波保持光増幅用ファイバ（以下、ＰＭ
−ＥＤＦと言う。）が求められるようになった。2. Description of the Related Art As the possibility of ultra-high-speed optical communication is examined, an erbium-doped optical fiber (hereinafter, referred to as EDF) having an optical amplifying action in which a core is doped with erbium.
In an optical fiber amplifier and an optical fiber laser using the same, various problems have occurred due to the polarization in the EDF. In order to solve such a problem, an EDF having a polarization maintaining characteristic and a polarization maintaining optical amplification fiber (hereinafter referred to as PM
-EDF. ) Was required.
【０００３】ところで、偏波保持特性を有する光ファイ
バとしては、圧縮だ円クラッド型，楕円コア型，ボウタ
イ型，ＰＡＮＤＡ型等があげられるが、その中でもＰＡ
ＮＤＡ型偏波保持光ファイバ（以下、ＰＡＮＤＡファイ
バと言う。）は精度よく作成可能であり、偏波保持特性
の良好な物を作れるという優れた特徴を持つ。ＰＡＮＤ
Ａファイバは、図２に示すように、コア１の両側方の対
称位置に一対の応力付与部２，２が設けられ、これらコ
ア１および応力付与部２，２がクラッド３で包囲された
構造となっており、通常のシングルモードファイバとは
応力付与部２，２が設けられている点が異なるところで
ある。以下、本発明では、このように、コア１の両側方
に応力付与部２，２を形成することをＰＡＮＤＡファイ
バ化すると言うことがある。[0003] Optical fibers having polarization maintaining characteristics include a compression elliptical clad type, an elliptical core type, a bow tie type, a PANDA type and the like.
An NDA type polarization maintaining optical fiber (hereinafter, referred to as a PANDA fiber) has an excellent feature that it can be produced with high accuracy and can be made with good polarization maintaining characteristics. PAND
As shown in FIG. 2, the A-fiber has a structure in which a pair of stress applying portions 2 and 2 are provided at symmetrical positions on both sides of a core 1, and the core 1 and the stress applying portions 2 and 2 are surrounded by a clad 3. This is different from a normal single mode fiber in that stress applying parts 2 and 2 are provided. Hereinafter, in the present invention, forming the stress applying portions 2 and 2 on both sides of the core 1 as described above may be referred to as a PANDA fiber.
【０００４】応力付与部２，２は、通常１５〜２０モル
％のＢ2Ｏ3（酸化ホウ素）を石英（ＳiＯ2）にドープし
たＢ2Ｏ3−ＳiＯ2ガラスからなるものである。このＢ2
Ｏ3−ＳiＯ2ガラスは石英ガラス（ＳiＯ2）に比べて大
きな熱膨張係数を有し、応力付与部２，２は、溶融紡糸
後にコア１に引張り応力を与え、これによりコア１に偏
波保持特性が付与されるようになっている。また、応力
付与部２，２による応力によってコア１の屈折率が光弾
性効果により上昇し、これに起因してカットオフ波長が
長波長側へシフトする。The stress applying portions 2 and 2 are usually made of B 2 O 3 —SiO 2 glass obtained by doping quartz (SiO 2 ) with 15 to 20 mol% of B 2 O 3 (boron oxide). This B 2
O 3 —SiO 2 glass has a larger coefficient of thermal expansion than quartz glass (SiO 2 ), and the stress imparting portions 2 and 2 apply a tensile stress to the core 1 after melt spinning, whereby the core 1 is polarized. Retention characteristics are provided. Further, the refractive index of the core 1 increases due to the photoelastic effect due to the stress by the stress applying units 2 and 2, and the cutoff wavelength shifts to the longer wavelength side due to this.
【０００５】一方、ＥＤＦは、波長１．５５μｍ帯の光
増幅用として使用され、その励起光（ポンプ光）の波長
が１４８０ｎｍのものと９８０ｎｍのものの２種類があ
る。９８０ｎｍ励起用ＥＤＦは、１４８０ｎｍ励起用Ｅ
ＤＦに比べて光増幅時の動作原理から安定した３準位動
作をするため、雑音特性が良いと言う特徴がある反面、
カットオフ波長を少なくとも９８０ｎｍよりも低波長側
となるように設計する必要がある。On the other hand, EDF is used for optical amplification in the 1.55 μm band, and there are two types of EDFs, in which the wavelength of pump light (pump light) is 1480 nm and 980 nm. The 980 nm excitation EDF is 1480 nm excitation EDF.
Compared to the DF, the three-level operation is more stable based on the operation principle at the time of optical amplification, so that it has good noise characteristics.
It is necessary to design so that the cutoff wavelength is at least lower than 980 nm.
【０００６】一般に、シングルモード光ファイバのカッ
トオフ波長を低波長にすると曲げ損失が大きくなる。カ
ットオフ波長と曲げ損失は、主に、該光ファイバのモー
ドフィールド径とコア／クラッド比屈折率差によって定
まる。ＥＤＦの屈折率分布（プロファイル）を設計する
際、励起光に対する励起効率を高めるため、モードフィ
ールド径は通常のシングルモード光ファイバのモードフ
ィールド径に比べて小さくされ、コア／クラッド比屈折
率差は大きくされる。In general, when the cutoff wavelength of a single mode optical fiber is set to a low wavelength, bending loss increases. The cutoff wavelength and the bending loss are mainly determined by the mode field diameter of the optical fiber and the core / clad relative refractive index difference. When designing the refractive index distribution (profile) of the EDF, the mode field diameter is made smaller than that of a normal single mode optical fiber, and the core / clad relative refractive index difference is increased in order to increase the pumping efficiency with respect to the pump light. Be enlarged.
【０００７】実際のＥＤＦのファイバ母材の作成上の制
約から、コア／グラッド比屈折率差を大きくすることに
限界があり、励起効率とのバランスからモードフィール
ド径，コア／クラッド比屈折率差の値は比較的狭い範囲
に限定される。このような事情から、９８０ｎｍ励起用
ＥＤＦのカットオフ波長は８００〜８５０ｎｍの範囲で
設計されている。[0007] Due to restrictions on the preparation of the fiber preform of the actual EDF, there is a limit in increasing the core / gradation relative refractive index difference, and the mode field diameter and the core / cladding relative refractive index difference are determined from the balance with the pumping efficiency. Is limited to a relatively narrow range. Under such circumstances, the cutoff wavelength of the 980 nm excitation EDF is designed in the range of 800 to 850 nm.
【０００８】ところで、ＰＡＮＤＡファイバとＥＤＦと
を組み合わせたＰＡＮＤＡ型ＰＭ−ＥＤＦは、図２に示
すものと同様にＥＤＦのエルビウムドープコア１の両側
方の対称位置に一対の応力付与部２，２を設け、これら
をクラッド３で包囲した構造を有するものである。この
ＰＡＮＤＡ型ＰＭ−ＥＤＦの製造は、通常のＰＡＮＤＡ
ファイバの製造と同様に、ＶＡＤ法などによりＥＤＦ用
の母材を作成する。ついで、この母材のコア部の両側方
に応力付与部となるガラスロッドを挿入するための一対
の挿入孔を穿孔し、この挿入孔にＢ2Ｏ3−ＳiＯ2ガラス
からなるガラスロッドを挿入する。ついで、この母材を
加熱，延伸し、溶融紡糸する方法によって行われる。In the PANDA type PM-EDF in which the PANDA fiber and the EDF are combined, a pair of stress applying portions 2 and 2 are provided at symmetrical positions on both sides of the erbium-doped core 1 of the EDF as shown in FIG. And a structure in which these are surrounded by a clad 3. The production of this PANDA-type PM-EDF is performed by the usual PANDA.
As in the case of manufacturing the fiber, a base material for EDF is prepared by a VAD method or the like. Next, a pair of insertion holes for inserting a glass rod serving as a stress applying portion is formed on both sides of the core portion of the base material, and a glass rod made of B 2 O 3 —SiO 2 glass is inserted into the insertion hole. I do. Then, the base material is heated, drawn, and melt-spun.
【０００９】このような構造をとることから、ＰＡＮＤ
Ａ型ＰＭ−ＥＤＦでも、応力付与部２，２の存在によ
り、応力付与部２，２のない通常のＥＤＦに比べてカッ
トオフ波長が必然的に長波長側にシフトする。このカッ
トオフ波長の長波長側へのシフト量は、経験的に応力付
与部２，２間の間隔ｄとの間に相関が認められる。Due to such a structure, PAND
Even in the A-type PM-EDF, due to the presence of the stress applying portions 2 and 2, the cutoff wavelength is naturally shifted to a longer wavelength side as compared with a normal EDF without the stress applying portions 2 and 2. The shift amount of the cutoff wavelength toward the longer wavelength side is empirically correlated with the distance d between the stress applying parts 2 and 2.
【００１０】図３のグラフは、クラッド径１２５μｍ、
応力付与部２の直径３３〜３８μｍのＰＡＮＤＡファイ
バについて、その応力付与部２，２の間隔ｄを変化させ
て多数作成し、カットオフ波長のシフト量を測定した結
果を示すものである。図３の縦軸は、ＰＡＮＤＡファイ
バの応力付与部を形成する前のシングルモードファイバ
の母材のカットオフ波長推定値Ａと、この母材から上述
の方法によって形成されたＰＡＮＤＡファイバのカット
オフ波長Ｂとの比Ｂ／Ａを表わす。このグラフから、応
力付与部の間隔ｄが狭くなるにつれてシフト量が増大
し、カットオフ波長が長波長側にシフトすることがわか
る。The graph of FIG. 3 shows a cladding diameter of 125 μm,
This shows the results of measuring a shift amount of the cutoff wavelength by preparing a large number of PANDA fibers having a diameter of 33 to 38 μm of the stress applying unit 2 while changing the distance d between the stress applying units 2 and 2. The vertical axis in FIG. 3 represents the cutoff wavelength estimation value A of the single-mode fiber base material before forming the stress applying portion of the PANDA fiber, and the cutoff wavelength of the PANDA fiber formed from the base material by the above-described method. It represents the ratio B / A to B. From this graph, it can be seen that as the distance d between the stress applying portions becomes smaller, the shift amount increases, and the cutoff wavelength shifts to the longer wavelength side.
【００１１】上述のように、９８０ｎｍ励起用ＥＤＦで
は、そのカットオフ波長を８００〜８５０ｎｍとなるよ
うに設計しているため、これをＰＡＮＤＡ型ＰＭ−ＥＤ
Ｆとすると、図３のグラフからそのカットオフ波長が
１．１〜１．２５倍程度長波長側にシフトし、８８０〜
１０６０ｎｍとなって、場合によっては励起光波長より
も長波長となり、使用できない。一方、図３のグラフか
ら応力付与部の間隔ｄが広がると、カットオフ波長のシ
フト量が低減することがわかり、カットオフ波長の長波
長側へのシフトを抑えるには、間隔ｄを大きくすればよ
いことになる。しかし、間隔ｄを大きくすると、応力付
与部２，２によるコア１に作用する応力が減少し、偏波
保持特性が低下し、偏波保持光ファイバ本来の機能を失
うことになる。As described above, since the cut-off wavelength of the 980 nm excitation EDF is designed to be 800 to 850 nm, the cut-off wavelength is set to PANDA type PM-ED.
Assuming that F, the cutoff wavelength shifts from the graph of FIG.
The wavelength becomes 1060 nm, and in some cases, the wavelength becomes longer than the wavelength of the excitation light and cannot be used. On the other hand, it can be seen from the graph of FIG. 3 that the shift amount of the cutoff wavelength is reduced when the distance d between the stress applying portions is increased. In order to suppress the shift of the cutoff wavelength to the longer wavelength side, the distance d must be increased. It will be good. However, when the distance d is increased, the stress acting on the core 1 by the stress applying parts 2 and 2 is reduced, the polarization maintaining characteristic is reduced, and the original function of the polarization maintaining optical fiber is lost.
【００１２】[0012]
【発明が解決しようとする課題】よって、本発明におけ
る課題は、９８０ｎｍ励起用ＰＡＮＤＡ型ＰＭ−ＥＤＦ
において、そのカットオフ波長が長波長側にシフトして
使用に供しえなくなることを防止し、かつコアに十分な
応力が作用して偏波保持特性が低下しないようにするこ
とにある。SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a PANDA type PM-EDF for 980 nm excitation.
It is an object of the present invention to prevent the cut-off wavelength from shifting to the longer wavelength side and becoming unusable, and to prevent sufficient stress from acting on the core to lower the polarization maintaining characteristic.
【００１３】[0013]
【課題を解決するための手段】かかる課題は、ＰＡＮＤ
Ａ型ＰＭ−ＥＤＦの一対の応力付与部間の間隔ｄを１６
〜２１μｍとすることで解決される。また、応力付与部
には、Ｂ2Ｏ3を１５〜２０モル％ドープしたＢ2Ｏ3−Ｓ
ｉＯ 2ガラスを用い、その直径を３３〜３８μｍとする
ことが好ましい。The object of the present invention is to provide a PAND
The distance d between the pair of stress applying portions of the A-type PM-EDF is 16
It can be solved by setting the thickness to 21 μm. In addition, the stress applying section
Has BTwoOThreeB doped with 15 to 20 mol%TwoOThree-S
iO TwoUse glass with a diameter of 33 to 38 μm
Is preferred.
【００１４】[0014]
【発明の実施の形態】以下、本発明を詳しく説明する。
図１のグラフは、カットオフ波長が８００ｎｍと８５０
ｎｍの２種の９８０ｎｍ励起用ＥＤＦをＰＡＮＤＡファ
イバ化したときのカットオフ波長と応力付与部の間隔ｄ
との関係を、図３のグラフに示された相関関係に基づい
て、示したものである。グラフ中、直線Ｃはカットオフ
波長８００ｎｍの、直線Ｄはカットオフ波長８５０ｎｍ
のものである。図１のグラフから、ＰＡＮＤＡファイバ
化することによって、カットオフ波長が長波長側へ大き
くシフトすることがわかる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.
The graph of FIG. 1 shows that the cutoff wavelength is 800 nm and 850.
cutoff wavelength and distance d between stress applying parts when two types of 980 nm excitation EDFs of 980 nm are converted into PANDA fibers.
Is shown based on the correlation shown in the graph of FIG. In the graph, a straight line C has a cutoff wavelength of 800 nm, and a straight line D has a cutoff wavelength of 850 nm.
belongs to. From the graph of FIG. 1, it can be seen that the cutoff wavelength greatly shifts to the longer wavelength side by using a PANDA fiber.
【００１５】９８０ｎｍ励起用ＰＡＮＤＡ型ＰＭ−ＥＤ
Ｆでは、そのカットオフ波長は、９８０ｎｍ以下でなけ
ればシングルモードファイバとして動作せず、そのため
曲げ損失が大きくなり励振効率が悪くなるので、増幅用
ファイバとして使用出来ない。また、実際の使用条件や
製品ファイバでのバラツキなどを考慮すると、カットオ
フ波長は９３０ｎｍ以下とすることが必要となる。した
がって、図１のグラフから、カットオフ波長が８００ｎ
ｍのＥＤＦをＰＡＮＤＡファイバ化した場合には間隔ｄ
を１６μｍ以上にし、カットオフ波長が８５０ｎｍのＥ
ＤＦをＰＡＮＤＡファイバ化した場合には間隔ｄを２１
μｍ以上すればよいことになる。PANDA type PM-ED for 980 nm excitation
In the case of F, the cut-off wavelength does not operate as a single mode fiber unless the cutoff wavelength is 980 nm or less. Therefore, the bending loss increases and the excitation efficiency deteriorates, so that the fiber cannot be used as an amplification fiber. Further, in consideration of the actual use conditions and the variation in the product fiber, the cutoff wavelength needs to be 930 nm or less. Therefore, from the graph of FIG.
When the EDF of m is converted to PANDA fiber, the distance d
Is set to 16 μm or more, and the E of the cutoff wavelength is 850 nm.
When the DF is a PANDA fiber, the interval d is set to 21.
It is sufficient that the thickness is at least μm.
【００１６】一方、上述のように間隔ｄを大きくすれ
ば、コア１に作用する応力が減少し、ＰＡＮＤＡファイ
バとして偏波保持機能が低下することになり、間隔ｄは
出来るだけ小さい方がよい。この点から、間隔ｄを１６
〜２１μｍとすれば、カットオフ波長が８００ｎｍのＥ
ＤＦであっても、８５０ｎｍのＥＤＦであっても、これ
をＰＡＮＤＡ化した場合にはそのカットオフ波長を９３
０ｎｍ以下とでき、しかも十分な偏波保持特性を有する
ようになる。On the other hand, if the interval d is increased as described above, the stress acting on the core 1 is reduced, and the polarization maintaining function of the PANDA fiber is reduced. The interval d is preferably as small as possible. From this point, the interval d is set to 16
If it is set to 21 μm, the cut-off wavelength of E is 800 nm.
Regardless of the DF or the 850 nm EDF, if this is converted to PANDA, the cutoff wavelength is set to 93.
It can be set to 0 nm or less and has sufficient polarization maintaining characteristics.
【００１７】また、本発明では応力付与部として、Ｂ2
Ｏ3を１５〜２０モル％ドープしたＢ 2Ｏ3−ＳｉＯ2ガラ
スを用い、その直径を３３〜３８μｍとすることが好ま
しく、これによって間隔ｄを１６〜２１μｍとしても、
コアに十分な応力が作用し偏波保持機能が高いレベルで
維持され、しかもカットオフ波長を９８０ｎｍ以下とす
ることができる。Further, in the present invention, as the stress applying portion, BTwo
OThreeB doped with 15 to 20 mol% TwoOThree-SiOTwoGala
It is preferable that the diameter be 33 to 38 μm.
Therefore, even if the distance d is 16 to 21 μm,
Sufficient stress acts on the core and the polarization maintaining function is at a high level
Is maintained and the cut-off wavelength is set to 980 nm or less.
Can be
【００１８】以下、具体例を示す。ＥＤＦ母材をＶＡＤ
法によって作成した。コア部分にドープしたエルビウム
濃度は１１００〜１２００ｐｐｍ、アルミニウム濃度は
１１０００〜１４０００ｐｐｍとした。得られた母材に
ついてプリフォームアナライザーにて測定した推定モー
ドフィルード径は４．５〜５．５μｍ、カットオフ波長
は８００〜８５０ｎｍであった。このＥＤＦ母材のコア
部の両側方の対称位置に一対の挿入孔を穿孔し、この挿
入孔にＢ2Ｏ3２０モル％ドープのＢ2Ｏ3−ＳｉＯ2ガラ
スのロッドを挿入した。挿入孔の位置は、ＰＡＮＤＡ型
ＰＭ−ＥＤＦとしたときに応力付与部の間隔ｄが２０μ
ｍとなるように、また挿入孔の孔径を応力付与部とした
ときの直径が３５μｍとなるように定めた。The following is a specific example. VAD for EDF base material
Created by law. The erbium concentration doped in the core portion was 1100 to 1200 ppm, and the aluminum concentration was 11000 to 14000 ppm. The presumed mode field diameter of the obtained base material measured by a preform analyzer was 4.5 to 5.5 μm, and the cutoff wavelength was 800 to 850 nm. The puncturing the pair of insertion holes at symmetrical positions on both sides of the core portion of the EDF preform was inserted the insertion hole into the B 2 O 3 20 mol% doped B 2 O 3 -SiO 2 glass rods. When the PANDA type PM-EDF is used, the distance d between the stress applying portions is 20 μm.
m and the diameter of the insertion hole as the stress applying portion is 35 μm.
【００１９】この母材を加熱，延伸し、溶融紡糸して、
外径１２５μｍのＰＡＮＤＡ型ＰＭ−ＥＤＦを作製し
た。このファイバのカットオフ波長は９３０〜９７０ｎ
ｍであり、９８０ｎｍ励起用として十分使用可能な値で
あった。また、モードフィルード径は５．１９〜５．３
９μｍであった。また、このファイバの増幅特性は、測
定波長１５４０〜１５６０ｎｍ、，入力パワー０ｄＢ
ｍ，励起パワー１００ｍＷ，ファイバ長２０ｍで１６．
８ｄＢであった。また、雑音指数は３．４５ｄＢであ
り、偏波クロストークは−２６ｄＢ／１００ｍであっ
た。This base material is heated, drawn, melt-spun,
A PANDA type PM-EDF having an outer diameter of 125 μm was produced. The cutoff wavelength of this fiber is 930-970n
m, which was a value sufficiently usable for excitation at 980 nm. The mode field diameter is 5.19 to 5.3.
It was 9 μm. The amplification characteristics of this fiber are: measurement wavelength 1540-1560 nm, input power 0 dB.
m, pump power 100 mW, fiber length 20 m.
It was 8 dB. The noise figure was 3.45 dB, and the polarization crosstalk was -26 dB / 100 m.
【００２０】以上の結果から、このＰＡＮＤＡ型ＰＭ−
ＥＤＦは、９８０ｎｍ励起用として使用でき、良好な増
幅特性，雑音特性を示し、しかも十分な偏波保持特性を
も有することがわかる。From the above results, this PANDA type PM-
It can be seen that the EDF can be used for pumping at 980 nm, exhibits good amplification characteristics and noise characteristics, and has sufficient polarization maintaining characteristics.
【００２１】[0021]
【発明の効果】以上説明したように本発明にあっては、
９８０ｎｍ励起用ＰＡＮＤＡ型ＰＭ−ＥＤＦにおいて、
応力付与部間の間隔ｄを１６〜２１μｍとしたので、カ
ットオフ波長を９８０ｎｍ以下に抑えることができ、し
かも十分な偏波保持機能を有するものが得られる。As described above, in the present invention,
In the PANDA type PM-EDF for 980 nm excitation,
Since the distance d between the stress applying portions is 16 to 21 μm, the cutoff wavelength can be suppressed to 980 nm or less, and a material having a sufficient polarization maintaining function can be obtained.
【図１】 ＰＡＮＤＡ型ＰＭ−ＥＤＦのとカットオフ波
長応力付与部の間隔ｄとの関係を示すグラフである。FIG. 1 is a graph showing a relationship between a PANDA type PM-EDF and a distance d between cut-off wavelength stress applying portions.
【図２】 ＰＡＮＤＡファイバの一例を示す断面図であ
る。FIG. 2 is a cross-sectional view illustrating an example of a PANDA fiber.
【図３】 ＰＡＮＤＡファイバのカットオフ波長のシフ
ト量と応力付与部間の間隔ｄとの関係を示すグラフであ
る。FIG. 3 is a graph showing a relationship between a shift amount of a cutoff wavelength of a PANDA fiber and a distance d between stress applying portions.
１…コア、２…応力付与部、３…クラッド DESCRIPTION OF SYMBOLS 1 ... Core, 2 ... Stress application part, 3 ... Clad
───────────────────────────────────────────────────── フロントページの続き (72)発明者 江森 滋 千葉県佐倉市六崎1440番地 株式会社フジ クラ佐倉事業所内 Ｆターム(参考） 2H050 AA04 AB07X AB18X AC44 AD16 5F072 AB09 AK06 JJ20 YY17 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shigeru Emori 1440 Mutsuzaki, Sakura-shi, Chiba F-term in Fujikura Sakura Works (reference) 2H050 AA04 AB07X AB18X AC44 AD16 5F072 AB09 AK06 JJ20 YY17
Claims (2)
に一対の応力付与部が設けられ、これらのコアおよび応
力付与部がクラッドに包囲されてなり、波長９８０ｎｍ
の励起光により励起されるＰＡＮＤＡ型偏波保持光増幅
用ファイバであって、 上記応力付与部間の間隔が１６〜２１μｍであることを
特徴とする偏波保持光増幅用ファイバ。A pair of stress applying portions are provided on both sides of an erbium-doped core, and the core and the stress applying portions are surrounded by a clad, and have a wavelength of 980 nm.
A PANDA type polarization maintaining light amplifying fiber that is excited by the pumping light according to (1), wherein the distance between the stress applying portions is 16 to 21 μm.
をドープしたＢ2Ｏ3−ＳiＯ2ガラスからなり、その直径
が３３〜３８μｍであることを特徴とする請求項１記載
の偏波保持光増幅用ファイバ。2. The method according to claim 1, wherein the stress imparting portion has 15 to 20 mol% of B 2 O 3.
Made from doped B 2 O 3 -SiO 2 glass, claim 1 polarization maintaining optical amplifying fiber according to its diameter is equal to or is 33～38Myuemu.
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|---|---|---|---|
| JP2000054647A JP3732705B2 (en) | 2000-02-29 | 2000-02-29 | Method for manufacturing polarization maintaining optical amplification fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000054647A JP3732705B2 (en) | 2000-02-29 | 2000-02-29 | Method for manufacturing polarization maintaining optical amplification fiber |
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| JP3732705B2 JP3732705B2 (en) | 2006-01-11 |
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|---|---|---|---|
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011018765A (en) * | 2009-07-08 | 2011-01-27 | Furukawa Electric Co Ltd:The | Optical fiber for optical amplification, optical fiber amplifier, and optical fiber laser |
| JP2016051804A (en) * | 2014-08-29 | 2016-04-11 | 株式会社フジクラ | Polarization holding fiber for amplification and fiber laser device using the same |
| CN114751638A (en) * | 2022-06-13 | 2022-07-15 | 武汉长进激光技术有限公司 | Panda type elliptical core few-mode erbium-doped optical fiber and preparation method thereof |
| WO2023145863A1 (en) * | 2022-01-31 | 2023-08-03 | 株式会社フジクラ | Polarization-maintaining fiber |
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|---|---|---|---|---|
| JPS58207003A (en) * | 1982-05-28 | 1983-12-02 | Nippon Telegr & Teleph Corp <Ntt> | Single polarization optical fiber of low loss, to which internal stress is given |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011018765A (en) * | 2009-07-08 | 2011-01-27 | Furukawa Electric Co Ltd:The | Optical fiber for optical amplification, optical fiber amplifier, and optical fiber laser |
| US8537458B2 (en) | 2009-07-08 | 2013-09-17 | Furukawa Electric Co., Ltd. | Optical fiber for optical amplification, optical fiber amplifier, and optical fiber laser |
| JP2016051804A (en) * | 2014-08-29 | 2016-04-11 | 株式会社フジクラ | Polarization holding fiber for amplification and fiber laser device using the same |
| WO2023145863A1 (en) * | 2022-01-31 | 2023-08-03 | 株式会社フジクラ | Polarization-maintaining fiber |
| CN114751638A (en) * | 2022-06-13 | 2022-07-15 | 武汉长进激光技术有限公司 | Panda type elliptical core few-mode erbium-doped optical fiber and preparation method thereof |
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|---|---|
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