JP5884654B2 - 光増幅器及び光増幅器制御方法 - Google Patents
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Description
ここで、ラマン増幅器100の適用例を説明する。図12は、実施例1に係るラマン増幅器100の適用例を説明するための図である。図12に示す例では、ラマン増幅器100のFBG103a〜103dは、それぞれ異なる実装位置に設置され、各実装位置に関する温度勾配が発生している。例えば、FBG103aの温度と、FBG103bの温度とはほぼ同じ温度であるが、FBG103cの温度は、FBG103dの温度と比較して高い。このような状況の下で、ラマン増幅器100は、FBG103a〜103b各々の温度を個別に制御する。このため、ラマン増幅器100は、FBG103a〜103b間に温度勾配が発生した場合でも、波長に対する利得偏差の平坦性を精度良く維持することができる。
101a〜101d LD
102 光源駆動部
103a〜103d 波長固定器(FBG)
104a,104b 偏波合波器
105 励起光合波器
106 信号光/励起光合波器
107 利得等化器(GEQ)
108 第一変動量記憶部
109 第二変動量記憶部
110a〜110d 温度調整部
111 温度測定部
112、212 変動量取得部
113、213 制御部
214 第三変動量記憶部
215 電流値検出部
Claims (5)
- 信号光をラマン増幅するための励起光の中心波長を固定する波長固定部に設置され、前記励起光の中心波長を変動させる該波長固定部の温度を調整する温度調整部と、
前記波長固定部の温度と、前記励起光を利用してラマン増幅された前記信号光の利得を所定の波長帯域を対象として等化する利得等化部の温度とを測定する温度測定部と、
前記温度測定部によって測定された前記波長固定部の温度に対応する前記励起光の中心波長の変動量を、前記波長固定部の温度と該温度に対する前記励起光の中心波長の変動量とを対応付けた第一の記憶部から取得し、測定された前記利得等化部の温度に対応する前記波長帯域の中心波長の変動量を、前記利得等化部の温度と該温度に対する前記波長帯域の中心波長の変動量とを対応付けた第二の記憶部から取得する変動量取得部と、
前記変動量取得部によって取得された二つの変動量の差分に対応する前記波長固定部の温度を前記第一の記憶部から取得し、取得した温度に基づいて、前記温度調整部によって調整される前記波長固定部の温度を制御する制御部と
を備えたことを特徴とする光増幅器。 - 前記波長固定部は、前記励起光を発する光源ごとに複数配置されるとともに、前記温度調整部は、各前記波長固定部に設置されて各前記波長固定部の温度をそれぞれ調整し、
前記温度測定部は、各前記波長固定部の温度と、前記利得等化部の温度とを測定し、
前記変動量取得部は、前記温度測定部によって測定された各前記波長固定部の温度に対応する前記励起光の中心波長の変動量を、各前記波長固定部の温度と該温度に対する前記励起光の中心波長の変動量とを対応付けた前記第一の記憶部から取得し、測定された前記利得等化部の温度に対応する前記波長帯域の中心波長の変動量を、前記第二の記憶部から取得し、
前記制御部は、前記変動量取得部によって取得された二つの変動量の差分に対応する各前記波長固定部の温度を前記第一の記憶部から取得し、取得した温度に基づいて、前記温度調整部によって調整される各前記波長固定部の温度をそれぞれ制御することを特徴とする請求項1に記載の光増幅器。 - 前記励起光を発する光源を駆動させるための駆動電流の電流値を検出する電流値検出部をさらに備え、
前記変動量取得部は、前記電流値検出部によって検出された前記駆動電流の電流値に対応する前記励起光の中心波長の変動量を、前記駆動電流の電流値と該電流値に対する前記励起光の中心波長の変動量とを対応付けた第三の記憶部から取得し、
前記制御部は、前記変動量取得部によって取得された変動量に対応する前記波長固定部の温度を前記第一の記憶部から取得し、取得した温度に基づいて、前記温度調整部によって調整される前記波長固定部の温度を制御することを特徴とする請求項1又は2に記載の光増幅器。 - 前記波長固定部は、前記励起光を発する光源ごとに複数配置されるとともに、前記温度調整部は、各前記波長固定部に設置されて各前記波長固定部の温度をそれぞれ調整し、
前記電流値検出部は、前記光源ごとに前記駆動電流の電流値を検出し、
前記変動量取得部は、前記電流値検出部によって検出された前記光源ごとの前記駆動電流の電流値に対応する前記励起光の中心波長の変動量を、前記光源ごとの前記駆動電流の電流値と該電流値に対する前記励起光の中心波長の変動量とを対応付けた第三の記憶部から取得し、
前記制御部は、前記変動量取得部によって取得された変動量に対応する各前記波長固定部の温度を前記第三の記憶部から取得し、取得した温度に基づいて、前記温度調整部によって調整される各前記波長固定部の温度を制御することを特徴とする請求項3に記載の光増幅器。 - 信号光をラマン増幅するための励起光の中心波長を固定する波長固定部に設置され、前記励起光の中心波長を変動させる該波長固定部の温度を調整する温度調整部を備えた光増幅器により実行される光増幅器制御方法であって、
前記波長固定部の温度と、前記励起光を利用してラマン増幅された前記信号光の利得を所定の波長帯域を対象として等化する利得等化部の温度とを測定し、
測定された前記波長固定部の温度に対応する前記励起光の中心波長の変動量を、前記波長固定部の温度と該温度に対する前記励起光の中心波長の変動量とを対応付けた第一の記憶部から取得し、測定された前記利得等化部の温度に対応する前記波長帯域の中心波長の変動量を、前記利得等化部の温度と該温度に対する前記波長帯域の中心波長の変動量とを対応付けた第二の記憶部から取得し、
取得された二つの変動量の差分に対応する前記波長固定部の温度を前記第一の記憶部から取得し、取得した温度に基づいて、前記温度調整部によって調整される前記波長固定部の温度を制御する
ことを特徴とする光増幅器制御方法。
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JP2786739B2 (ja) | 1990-10-30 | 1998-08-13 | 株式会社東芝 | 過励磁検出継電装置 |
US5541766A (en) * | 1994-11-30 | 1996-07-30 | At&T Corp. | Gain control for optically amplified systems |
JP2663904B2 (ja) | 1995-03-24 | 1997-10-15 | 日本電気株式会社 | 伝達関数評価装置 |
JP4295368B2 (ja) | 1998-04-07 | 2009-07-15 | 株式会社ケンウッド | 電磁界解析方法 |
KR100328291B1 (ko) * | 1998-07-14 | 2002-08-08 | 노베라 옵틱스 인코포레이티드 | 능동제어된파장별이득을갖는광증폭기및변화가능한출력스펙트럼을갖는광섬유광원 |
JP3585758B2 (ja) * | 1999-01-18 | 2004-11-04 | 富士通株式会社 | 利得等化のための方法並びに該方法の実施に使用する装置及びシステム |
JP2000341213A (ja) * | 1999-05-26 | 2000-12-08 | Fujitsu Ltd | 温度補償機能を有する利得調整器および光増幅器 |
JP2000346891A (ja) | 1999-06-07 | 2000-12-15 | Toshiba Corp | 電磁界解析方法 |
JP3449316B2 (ja) * | 1999-10-04 | 2003-09-22 | 日本電気株式会社 | 光ファイバ増幅装置 |
JP2001257402A (ja) * | 2000-03-08 | 2001-09-21 | Nec Corp | 光増幅媒体コンポーネントとこれを備えた光ファイバ増幅器 |
WO2002017010A1 (fr) * | 2000-08-25 | 2002-02-28 | Fujitsu Limited | Systeme de communication optique, procede permettant de fournir de la lumiere d'excitation, et amplificateur raman distribue |
JP2002076482A (ja) * | 2000-08-31 | 2002-03-15 | Fujitsu Ltd | 光増幅器,光増幅方法及び光増幅システム |
US20020171913A1 (en) * | 2000-11-16 | 2002-11-21 | Lightbit Corporation | Method and apparatus for acheiving |
US20020154387A1 (en) * | 2001-04-20 | 2002-10-24 | Kenji Mori | Gain equalizer, collimator with gain equalizer and method of manufacturing gain equalizer |
US6882776B2 (en) * | 2001-11-06 | 2005-04-19 | Intel Corporation | Method and apparatus of a semiconductor-based gain equalization device for optical amplifiers |
US7233712B2 (en) * | 2002-04-22 | 2007-06-19 | Sanmina-Sci Corporation | Temperature-controlled flexible optical circuit for use in an erbium-doped fiber amplifier and method for fabricating the flexible optical circuit |
JP4094352B2 (ja) * | 2002-06-24 | 2008-06-04 | 富士通株式会社 | 光増幅器 |
US7336415B2 (en) * | 2002-07-10 | 2008-02-26 | Sumitomo Electric Industries, Ltd. | Optical amplification module, optical amplification apparatus, and optical communications system |
JP4194815B2 (ja) | 2002-09-04 | 2008-12-10 | 株式会社フジクラ | 光増幅器 |
US20040196882A1 (en) * | 2003-04-01 | 2004-10-07 | Sumitomo Electric Industries, Ltd. | Optical amplifier |
JP5617550B2 (ja) * | 2010-11-12 | 2014-11-05 | 富士通株式会社 | 光伝送装置、光伝送システム及び光伝送方法 |
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