JP2003185852A - Method for manufacturing depolarizer, depolarizer and excitation light source for raman amplification - Google Patents
Method for manufacturing depolarizer, depolarizer and excitation light source for raman amplificationInfo
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- JP2003185852A JP2003185852A JP2001382044A JP2001382044A JP2003185852A JP 2003185852 A JP2003185852 A JP 2003185852A JP 2001382044 A JP2001382044 A JP 2001382044A JP 2001382044 A JP2001382044 A JP 2001382044A JP 2003185852 A JP2003185852 A JP 2003185852A
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- depolarizer
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- optical fibers
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- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は半導体レーザ素子
（ＬＤ）から発振されるＬＤ光を非偏光化して励起光と
するデポラライザの製造方法と、デポラライザと、その
デポラライザを使用したラマン光増幅用励起光源に関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a depolarizer for depolarizing LD light emitted from a semiconductor laser device (LD) into excitation light, a depolarizer, and pumping for Raman light amplification using the depolarizer. Regarding the light source.
【０００２】[0002]
【従来の技術】ＬＤから発振された励起光により、信号
光を増幅媒体である光ファイバ内でラマン光増幅するラ
マン光増幅器は、昨今、伝送距離の長距離化やビットレ
ートの高速化に適した光増幅器として注目を集めてい
る。2. Description of the Related Art Raman optical amplifiers for amplifying Raman light in signal light in an optical fiber as an amplification medium by pumping light oscillated from an LD are nowadays suitable for increasing the transmission distance and increasing the bit rate. Is gaining attention as an optical amplifier.
【０００３】増幅媒体としての光ファイバ内でラマン光
増幅されるラマン利得は、励起光の偏波状態（偏光状
態）と、信号光の偏波状態（偏光状態）の相互関係に強
く依存する。例えば、励起光の偏波が直線偏波の場合
（通常半導体レーザ素子から出射されるレーザ光は直線
偏波である）、信号光が励起光の偏波に平行な直線偏波
であればラマン増幅利得は増大し、励起光の偏波に垂直
な直線偏波であればラマン利得は減少する。即ち、利得
の大きさが励起光の偏光状態と信号光の偏光状態の相対
関係に強く依存する利得の偏波依存性（ＰＤＧ：Po1ari
zation Dependenceof Gain)がある。The Raman gain that is Raman-amplified in an optical fiber as an amplification medium strongly depends on the mutual relationship between the polarization state (polarization state) of the pumping light and the polarization state (polarization state) of the signal light. For example, when the polarization of pumping light is linearly polarized (usually the laser light emitted from a semiconductor laser element is linearly polarized), if the signal light is linearly polarized parallel to the polarization of pumping light, Raman The amplification gain increases, and the Raman gain decreases if the polarization is linear polarization perpendicular to the polarization of the pumping light. That is, the polarization dependence of the gain (PDG: Po1ari) in which the magnitude of the gain strongly depends on the relative relationship between the polarization state of the pump light and the polarization state of the signal light.
zation Dependence of Gain).
【０００４】ラマン光増幅で十分に安定した利得を得る
ためには、利得の偏波依存性を解消する必要がある。そ
のため、ラマン光増幅に用いる励起光は偏光度を小さく
する必要がある。ＬＤ光を非偏光化する手段の一つとし
て、ＬＤの出力端に非偏光化装置（デポラライザ：Depo
1arizer)を取付ける方法がある。In order to obtain a sufficiently stable gain in Raman optical amplification, it is necessary to eliminate the polarization dependence of the gain. Therefore, it is necessary to reduce the polarization degree of the pumping light used for Raman light amplification. As one of the means for depolarizing LD light, a depolarizer (Depollizer: Depo
1arizer) can be installed.
【０００５】非偏光化した励起光の偏光度（ＤＯＰ：De
gree of Po1arization）とラマン利得のＰＤＧの関係を
図３に示す。図３より、ＬＤ光を非偏光化することで、
ラマン利得のＰＤＧを解消できることがわかる。ここ
で、ＤＯＰは以下の式で記述される。
ＤＯＰ（％）＝（偏光成分の強度／全強度）×１００Degree of polarization of unpolarized excitation light (DOP: De
Fig. 3 shows the relationship between the gree of Po1arization) and the PDG of Raman gain. From FIG. 3, by depolarizing the LD light,
It can be seen that PDG with Raman gain can be eliminated. Here, DOP is described by the following formula. DOP (%) = (strength of polarized component / total strength) × 100
【０００６】ＬＤから発振される励起用光を非偏光化す
るデポラライザの一つとして、図４に示すものがある。
これはファイバグレーティング（ＦＢＧ）の出力ポート
に接続された偏波保持ファイバ（通常はパンダ型ファイ
バ：PANDA Fiber)Ａと非偏光化用の偏波保持ファイバ
（通常はパンダ型ファイバ：PANDA Fiber)Ｂとを、両者
の主軸が相対的に４５°の角度となるように融着したも
のである。４５°の角度設定は融着器の画像解析により
行っていた。As one of the depolarizers for depolarizing the excitation light emitted from the LD, there is one shown in FIG.
This is a polarization maintaining fiber (usually a panda fiber) A connected to the output port of a fiber grating (FBG) and a polarization maintaining fiber for depolarizing (usually a panda fiber) B. And are fused so that the principal axes of both are relatively at an angle of 45 °. The angle setting of 45 ° was performed by image analysis of the fuser.
【０００７】[0007]
【発明が解決しようとする課題】前記方法では４５°と
なるように設定しても±２°の角度誤差が生じる。この
誤差はＤＯＰ値として５％程度の劣化原因となる。ＤＯ
Ｐ値を５％以下にするためにはその誤差が±２°である
必要がある。In the above method, even if the angle is set to 45 °, an angle error of ± 2 ° occurs. This error causes deterioration of the DOP value by about 5%. DO
In order to reduce the P value to 5% or less, the error needs to be ± 2 °.
【０００８】[0008]
【課題を解決するための手段】本発明は４５°に設定す
る場合、角度合わせを、画像処理ではなく、ＤＯＰ値を
測定しながら設定する方法である。The present invention is a method of setting the angle adjustment while measuring the DOP value, not by image processing, when setting 45 °.
【０００９】本発明の第１のデポラライザの製造方法
は、一対の偏波保持光ファイバの光学主軸（高速軸又は
低速軸）を互いに異ならせて接続してデポラライザを製
造するデポラライザの製造方法において、一方の偏波保
持光ファイバに光源を接続し、他方の光ファイバに偏光
度測定器を接続して、光源から発せられた光を偏光度測
定器で受け、ＤＯＰ測定器で測定されるＤＯＰ値が最小
となるように両偏波保持光ファイバの光学主軸の角度を
設定して、両偏波保持光ファイバを接続する方法であ
る。A first method of manufacturing a depolarizer according to the present invention is a method of manufacturing a depolarizer in which a pair of polarization-maintaining optical fibers are connected with different optical main axes (high speed axis or low speed axis). A light source is connected to one polarization-maintaining optical fiber, a polarization degree measuring device is connected to the other optical fiber, and the light emitted from the light source is received by the polarization degree measuring device and measured by the DOP measuring device. This is a method of connecting both polarization-maintaining optical fibers by setting the angle of the optical main axis of both polarization-maintaining optical fibers so as to minimize.
【００１０】本発明の第２のデポラライザの製造方法
は、前記第１のデポラライザの製造方法において、一対
の偏波保持光ファイバを互いに融着接続する方法であ
る。A second method of manufacturing the depolarizer of the present invention is the method of manufacturing the first depolarizer, in which a pair of polarization-maintaining optical fibers are fusion-spliced to each other.
【００１１】本発明の第３のデポラライザの製造方法
は、前記第２のデポラライザの製造方法において、一対
の偏波保持光ファイバを互いに融着接続する際、両偏波
保持光ファイバを、調心ずれ５μｍ以下、ファイバ間隔
１０μｍ以下に設定して融着接続する方法である。A third method of manufacturing a depolarizer of the present invention is the method of manufacturing a second depolarizer, wherein when the pair of polarization-maintaining optical fibers are fusion-spliced to each other, both polarization-maintaining optical fibers are aligned. This is a method of fusion splicing with a gap of 5 μm or less and a fiber interval of 10 μm or less.
【００１２】本発明の第４のデポラライザの製造方法
は、前記第２のデポラライザの製造方法において、一対
の偏波保持光ファイバを互いに融着接続した後の両偏波
保持光ファイバ芯ずれが５μｍ以下、角度ずれが２度以
下となるように放電時間、放電強度、突き出し量を制御
して融着接続する方法である。A fourth method of manufacturing a depolarizer according to the present invention is the method of manufacturing a second depolarizer, wherein the misalignment of both polarization-maintaining optical fibers after fusion-splicing a pair of polarization-maintaining optical fibers is 5 μm. The following is a method of fusion-splicing by controlling the discharge time, the discharge intensity, and the protrusion amount so that the angle deviation is 2 degrees or less.
【００１３】本発明のデポラライザは、一対の偏波保持
光ファイバを、芯ずれ５μｍ以下、角度ずれ２度以下に
して接続し、かつ偏光度値（ＤＯＰ値）が１０％以下と
なるように光学主軸を互いに異ならせて接続したもので
ある。The depolarizer of the present invention connects a pair of polarization-maintaining optical fibers with a core misalignment of 5 μm or less and an angular misalignment of 2 ° or less, and has an optical polarization value (DOP value) of 10% or less. The main shafts are connected differently from each other.
【００１４】本発明のラマン増幅用励起光源は、請求項
５記載のデポラライザの一方の偏波保持光ファイバに半
導体素子が接続され、他方の偏波保持光ファイバの端部
から、前記半導体素子から放出された光が非偏光化され
た状態で出力されるように構成されたものである。In the Raman amplification pumping light source of the present invention, a semiconductor element is connected to one polarization-maintaining optical fiber of the depolarizer according to claim 5, and the semiconductor element is connected from the end of the other polarization-maintaining optical fiber. The emitted light is configured to be output in a non-polarized state.
【００１５】[0015]
【発明の実施形態】本発明のデポラライザの製造方法の
一実施形態を図１に基づいて説明する。図１の製造方法
は、二つのＬＤの出力側にファイバグレーテイング（Ｆ
ＢＧ）を接続し、両ＦＢＧの先に二つのＬＤから発振さ
れる同一波長または異なる波長のＬＤ光を偏波合成する
偏波合成器（ＰＢＣ）を接続し、ＰＢＣの出力ポートに
偏波保持ファイバ（ＰＭＦ：Po1arization Maintaining
Fiber）１を接続し、その偏波保持光ファイバ１と非偏
光化用の偏波保持ファイバ２（一対の偏波保持光ファイ
バ）を、光学主軸（高速軸又は低速軸）を互いに異なら
せて接続部３において接続する方法である。この実施形
態では、この接続に当たり、偏波保持ファイバ２の出射
端にＤＯＰ測定器を接続し、ＬＤから発せられた光をＤ
ＯＰ測定器で受け、ＤＯＰ測定器で測定されるＤＯＰ値
が最小となるように両偏波保持光ファイバ１、２の光学
軸を所定角度に調節し、その状態で両偏波保持光ファイ
バ１、２の端部を加熱融着するようにしてある。BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a method for manufacturing a depolarizer of the present invention will be described with reference to FIG. In the manufacturing method of FIG. 1, the fiber grating (F
BG) is connected, a polarization combiner (PBC) that combines the LD light of the same wavelength or different wavelengths oscillated from the two LDs is connected in front of both FBGs, and the polarization is maintained at the output port of the PBC. Fiber (PMF: Po1arization Maintaining)
Fiber) 1 and the polarization-maintaining optical fiber 1 and the polarization-maintaining optical fiber 2 for depolarization (a pair of polarization-maintaining optical fibers) are made to have different optical main axes (high-speed axis or low-speed axis). This is a method of connecting at the connection unit 3. In this embodiment, at the time of this connection, a DOP measuring device is connected to the emission end of the polarization maintaining fiber 2 and the light emitted from the LD is D
The optical axes of both polarization-maintaining optical fibers 1 and 2 are adjusted to a predetermined angle so that the DOP value received by the OP measuring device and measured by the DOP measuring device is minimized. The two end portions are heated and fused.
【００１６】前記実施形では、図２のように、夫々の両
偏波保持ファイバ１、２をホルダー４で保持し、両偏波
保持ファイバ１、２の先端部を上面にＶ溝が形成されて
いる保持具６により保持する。ホルダー４はＸ，Ｙ，Ｚ
方向に移動できるものであり、しかもＺ軸（光軸）を中
心にして回転可能としてある。両偏波保持ファイバ１、
２をＸ，Ｙ，Ｚ方向に移動させることにより両偏波保持
ファイバ１、２の光学軸の角度調整を行う。角度設定後
の接続は、図２の対向する放電電極５間の放電アークに
より両偏波保持光ファイバ１、２の端部を加熱融着して
行う。In the above-described embodiment, as shown in FIG. 2, both polarization-maintaining fibers 1 and 2 are held by a holder 4, and V-grooves are formed on the upper ends of the both polarization-maintaining fibers 1 and 2. It is held by the holding tool 6. Holder 4 is X, Y, Z
It can move in any direction, and can rotate about the Z axis (optical axis). Both polarization-maintaining fibers 1,
The angle of the optical axes of both polarization maintaining fibers 1 and 2 is adjusted by moving 2 in the X, Y and Z directions. The connection after setting the angle is performed by heating and fusing the ends of both polarization-maintaining optical fibers 1 and 2 with a discharge arc between the opposing discharge electrodes 5 in FIG.
【００１７】両偏波保持光ファイバ１、２の融着に当た
っては、両偏波保持光ファイバ１、２の調心精度を５μ
ｍ以下に、ファイバ間隔を１０μｍ以下に設定するのが
望ましい。また、融着のための放電時間、放電強度、放
電電極５間への偏波保持ファイバ１、２の突き出し量
（ファイバ間隔）などの条件を最適化、例えば、ＤＯＰ
値１０％上昇、に設定して、両偏波保持ファイバ１、２
の融着後の芯ずれが５μｍ以下、角度ずれが２度以下と
なるように融着する。In fusing both polarization-maintaining optical fibers 1 and 2, the alignment accuracy of both polarization-maintaining optical fibers 1 and 2 is 5 μm.
It is desirable to set the fiber spacing to 10 m or less and the fiber interval to 10 m or less. Further, the conditions such as the discharge time for fusion, the discharge intensity, and the protrusion amount (fiber interval) of the polarization maintaining fibers 1 and 2 between the discharge electrodes 5 are optimized, for example, DOP.
The value is increased by 10%, and both polarization-maintaining fibers 1 and 2 are set.
The fusion is performed so that the misalignment after fusion is 5 μm or less and the angular misalignment is 2 degrees or less.
【００１８】前記デポラライザの製造方法により製造さ
れたデポラライザは、接続された一対の偏波保持光ファ
イバ１、２の芯ずれが５μｍ以下、角度ずれが２度以下
になり、ＤＯＰ値が１０％以下となるように光学主軸が
互いに異なって接続されたものとなる。The depolarizer manufactured by the above-mentioned depolarizer manufacturing method has a pair of polarization-maintaining optical fibers 1 and 2 connected with a core misalignment of 5 μm or less, an angular misalignment of 2 ° or less, and a DOP value of 10% or less. Therefore, the optical main axes are connected so as to be different from each other.
【００１９】前記デポラライザはラマン増幅用励起光源
として使用することができる。その場合は、一方の偏波
保持光ファイバ１にＬＤを接続し、ＬＤから放出された
光が非偏光化されて、他方の偏波保持光ファイバ２の端
部から出力されるように構成される。The depolarizer can be used as a pumping light source for Raman amplification. In that case, an LD is connected to one polarization maintaining optical fiber 1 so that the light emitted from the LD is depolarized and output from the end of the other polarization maintaining optical fiber 2. It
【００２０】前記デポラライザの製造方法により両偏波
保持光ファイバ１、２を融着した場合、融着後のＤＯＰ
の変化は表１のようになった。表１の融着前のＤＯＰ値
は両偏波保持光ファイバ１、２の主軸を相対的に４５°
にした場合の最小値である。表１の融着前後の測定誤差
は２％以下である。表１の解放は両偏波保持光ファイバ
１、２をホルダー４から解放した場合である。When the two polarization-maintaining optical fibers 1 and 2 are fused by the manufacturing method of the depolarizer, the DOP after the fusion is fused.
Table 1 shows the changes in. The DOP value before fusion in Table 1 is 45 ° relative to the main axes of both polarization-maintaining optical fibers 1 and 2.
This is the minimum value when set to. The measurement error before and after fusion in Table 1 is 2% or less. The release in Table 1 is the case where both polarization-maintaining optical fibers 1 and 2 are released from the holder 4.
【００２１】表１から、本発明の融着方法で融着した場
合（融着後）は、ＤＯＰ値が６％以下となっており、融
着前後のＤＯＰ値の劣化は平均３．３％となっている。
従前の融着器の自動角度設定を利用して角度設定した後
の解放後のＤＯＰ値は15％以下、本発明によりＤＯＰ値
を見ながら角度設定した後の自動融着では解放後のＤＯ
Ｐ値が１０％以下、融着前後のＤＯＰ値の劣化は７％と
なっている。これより、本発明のデポラライザの製造方
法によればＤＯＰ値を数％に下がったデポラライザを得
ることが可能となることが確認できた。From Table 1, when fused by the fusion method of the present invention (after fusion), the DOP value is 6% or less, and the deterioration of the DOP value before and after fusion is 3.3% on average. Has become.
The DOP value after releasing the angle after setting the angle by using the automatic angle setting of the conventional fuser is 15% or less, and in the automatic fusing after setting the angle while observing the DOP value according to the present invention, the DO after releasing is released.
The P value is 10% or less, and the deterioration of the DOP value before and after fusion is 7%. From this, it was confirmed that according to the method for manufacturing a depolarizer of the present invention, it is possible to obtain a depolarizer having a DOP value reduced to several percent.
【００２２】[0022]
【表１】 [Table 1]
【００２３】[0023]
【発明の効果】本発明のデポラライザの製造方法によれ
ば、ＤＯＰ値が数％に下がったデポラライザを製造する
ことができる。According to the method of manufacturing a depolarizer of the present invention, it is possible to manufacture a depolarizer having a DOP value of several percent.
【００２４】本発明のデポラライザは、ＤＯＰ値が数％
に下がっているため、そのデポラライザをＬＤの出力端
に取付けるとＬＤ光が非偏光化され、非偏光化された光
を励起光として使用してラマン利得のＰＤＧを解消する
ことができる。The depolarizer of the present invention has a DOP value of several percent.
Therefore, when the depolarizer is attached to the output end of the LD, the LD light is depolarized, and the PDG with Raman gain can be eliminated by using the unpolarized light as the excitation light.
【００２５】本発明のラマン増幅用励起光源は、前記デ
ポラライザをＬＤの出力端に取付けたので、ＬＤ光が非
偏光化されて励起光となり、ラマン利得のＰＤＧが解消
され、十分なラマン利得の安定性が得られる。In the pumping light source for Raman amplification of the present invention, since the depolarizer is attached to the output end of the LD, the LD light is depolarized into pumping light, the PDG of Raman gain is eliminated, and a sufficient Raman gain is obtained. Stability is obtained.
【図１】本発明のデポラライザの製造方法の一例を示す
説明図。FIG. 1 is an explanatory view showing an example of a method for manufacturing a depolarizer of the present invention.
【図２】本発明のデポラライザの製造方法に使用される
偏波保持ファイバ用融着器の一例を示す構成図。FIG. 2 is a configuration diagram showing an example of a polarization-maintaining fiber fusion splicer used in the depolarizer manufacturing method of the present invention.
【図３】ラマン利得のＰＤＧとＤＯＰの関係を示す説明
図。FIG. 3 is an explanatory diagram showing a relationship between PDG and DOP of Raman gain.
【図４】一対の偏波偏波保持光ファイバを４５°に接続
した既存のデポラライザの説明図。FIG. 4 is an explanatory view of an existing depolarizer in which a pair of polarization maintaining optical fibers are connected at 45 °.
１ 偏波保持ファイバ ２ 非偏光化用偏波保持ファイバ ３ 接続部 ４ ホルダー ５ 放電電極 ＬＤ 半導体レーザ素子 ＦＢＧ ファイバグレーテイング 1 Polarization maintaining fiber 2 Polarization-maintaining fiber for depolarization 3 connection 4 holder 5 discharge electrodes LD semiconductor laser device FBG fiber grating
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｈ０１Ｓ 3/06 Ｈ０１Ｓ 3/30 Ｚ 3/10 Ｇ０２Ｂ 6/16 ３０１ 3/30 6/24 ３０１ (72)発明者 並木 周 東京都千代田区丸の内二丁目６番１号 古 河電気工業株式会社内 Ｆターム(参考） 2H036 MA11 2H049 BA12 BA42 BB06 BC12 BC25 2H050 AC42 AC90 2K002 AA02 AB30 CA15 DA10 GA01 HA23 5F072 AB07 AK06 JJ20 KK30 PP07 QQ07 YY17 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) H01S 3/06 H01S 3/30 Z 3/10 G02B 6/16 301 3/30 6/24 301 (72) Inventor Shu Namiki 2-6-1, Marunouchi, Chiyoda-ku, Tokyo F-term, Furukawa Electric Co., Ltd. (reference) 2H036 MA11 2H049 BA12 BA42 BB06 BC12 BC25 2H050 AC42 AC90 2K002 AA02 AB30 CA15 DA10 GA01 HA23 5F072 AB07 AK06 JJ20 KK30 KK PP07 QQ07 YY17
Claims (6)
速軸又は低速軸）を互いに異ならせて接続してデポララ
イザを製造するデポラライザの製造方法において、一方
の偏波保持光ファイバに光源を接続し、他方の光ファイ
バに偏光度測定器（ＤＯＰ測定器）を接続して、光源か
ら発せられた光をＤＯＰ測定器で受け、ＤＯＰ測定器で
測定される偏光度値（ＤＯＰ値）が最小となるように両
偏波保持光ファイバの光学主軸の角度を設定して、両偏
波保持光ファイバを接続することを特徴とするデポララ
イザの製造方法。1. A method of manufacturing a depolarizer in which a pair of polarization-maintaining optical fibers are connected with different optical main axes (high-speed axis or low-speed axis) different from each other to manufacture a depolarizer. The polarization degree measuring device (DOP measuring device) is connected to the other optical fiber, the light emitted from the light source is received by the DOP measuring device, and the polarization degree value (DOP value) measured by the DOP measuring device is A method of manufacturing a depolarizer, characterized in that the angles of the optical main axes of both polarization-maintaining optical fibers are set so as to be minimum, and both polarization-maintaining optical fibers are connected.
続することを特徴とする請求項１記載のデポラライザの
製造方法。2. A method of manufacturing a depolarizer according to claim 1, wherein a pair of polarization-maintaining optical fibers are fusion-spliced to each other.
続する際、両偏波保持光ファイバを、調心ずれ５μｍ以
下、ファイバ間隔１０μｍ以下に設定して融着接続する
ことを特徴とする請求項２記載のデポラライザの製造方
法。3. When the pair of polarization-maintaining optical fibers are fusion-spliced to each other, the both polarization-maintaining optical fibers are fusion-spliced with a misalignment of 5 μm or less and a fiber interval of 10 μm or less. The method of manufacturing a depolarizer according to claim 2.
続した後の両偏波保持光ファイバの芯ずれが５μｍ以
下、角度ずれが２度以下となるように放電時間、放電強
度、突き出し量を制御して融着接続することを特徴とす
る請求項２記載のデポラライザの製造方法。4. A discharge time, a discharge intensity, and a protrusion such that a core deviation of both polarization-maintaining optical fibers after fusion-splicing a pair of polarization-maintaining optical fibers is 5 μm or less and an angle deviation is 2 ° or less. The method of manufacturing a depolarizer according to claim 2, wherein the amount is controlled and fusion-splicing is performed.
ｍ以下、角度ずれ２度以下にして接続し、かつ偏光度値
（ＤＯＰ値）が１０％以下となるように光学主軸を互い
に異ならせて接続したことを特徴とするデポラライザ。5. A pair of polarization-maintaining optical fibers having a core misalignment of 5 μm.
A depolarizer, wherein the depolarizers are connected to each other with an angle deviation of 2 m or less and 2 ° or less, and different optical principal axes so that the polarization degree value (DOP value) is 10% or less.
波保持光ファイバに半導体素子が接続され、他方の偏波
保持光ファイバの端部から、前記半導体素子から放出さ
れた光が非偏光化されて出力されるように構成されたこ
とを特徴とするラマン増幅用励起光源。6. The depolarizer according to claim 5, wherein a semiconductor element is connected to one polarization-maintaining optical fiber, and light emitted from the semiconductor element is unpolarized from the end of the other polarization-maintaining optical fiber. A pumping light source for Raman amplification, which is configured to be converted into an output.
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|---|---|---|---|
| JP2001382044A JP2003185852A (en) | 2001-12-14 | 2001-12-14 | Method for manufacturing depolarizer, depolarizer and excitation light source for raman amplification |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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|---|---|
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016001836A (en) * | 2014-06-12 | 2016-01-07 | 富士通株式会社 | Amplifier, receiver, and amplification method |
| CN105259728A (en) * | 2015-11-25 | 2016-01-20 | 福州大学 | Method for extracting characteristic parameters of multi-channel signal gain-polarization degree relation of nolinear fiber amplifier |
| CN108321673A (en) * | 2018-04-27 | 2018-07-24 | 中国人民解放军国防科技大学 | High-order Raman suppression method based on polarization maintaining fiber 45-degree dislocation welding technology |
-
2001
- 2001-12-14 JP JP2001382044A patent/JP2003185852A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2016001836A (en) * | 2014-06-12 | 2016-01-07 | 富士通株式会社 | Amplifier, receiver, and amplification method |
| US9544087B2 (en) | 2014-06-12 | 2017-01-10 | Fujitsu Limited | Amplifying device, receiving device, and amplification method |
| CN105259728A (en) * | 2015-11-25 | 2016-01-20 | 福州大学 | Method for extracting characteristic parameters of multi-channel signal gain-polarization degree relation of nolinear fiber amplifier |
| CN108321673A (en) * | 2018-04-27 | 2018-07-24 | 中国人民解放军国防科技大学 | High-order Raman suppression method based on polarization maintaining fiber 45-degree dislocation welding technology |
| CN108321673B (en) * | 2018-04-27 | 2023-09-22 | 中国人民解放军国防科技大学 | High-order Raman suppression method based on polarization maintaining fiber 45-degree dislocation fusion technology |
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