JP6096296B2 - 外部キャビティファブリペローレーザ - Google Patents
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Description
次に、図1を参照すると、高速で長距離にわたる高性能WDM伝送を可能にする外部キャビティFPレーザ構造100の一例が示されている。図示の実施態様では、基本のレーザ構造はFPレーザキャビティ、例えばFPレーザダイオード102を含み、FPレーザキャビティの出力は、最初に、ファラデー回転子(FR)104を通過し、次に、例えば、数百メートルから数キロメートルに及ぶ長さを有する光ファイバ106に結合される。ファラデー回転子(FR)104は、レーザ偏光を45度だけ回転させる。実施態様によっては、FRは構造に含まれない。同様に、光ファイバは、いくつかの実施態様では、偏波保持ファイバと取り替えることができる。
104 ファラデー回転子
106 光ファイバ
108 波長分割多重化フィルタ
110 スプリッタ
112 ファラデー回転子ミラー
200 自己注入同期FPレーザ構造
202 外部変調器
300 外部キャビティFPレーザ構造
402 アレイ導波路回折格子ベースWDM MUX
502 光回線終端装置ポイント
504 第一マルチプレクサ
506 第一スプリッタ
508 第一ファラデー回転子ミラー
510 光ファイバ
512 第二スプリッタ
514 第二ファラデー回転子ミラー
516 第二マルチプレクサ
518 光網終端装置
Claims (17)
- FPレーザダイオードと、
前記FPレーザダイオードの光出力を受けるように結合され、かつ前記光出力の偏光を実質的に45度だけ回転させるファラデー回転子(FR)と、
前記ファラデー回転子(FR)の出力を受けるために第一端部で結合された光ファイバと、
前記光ファイバからの光信号を受けるために前記光ファイバの第二端部に結合された波長分割マルチプレクサ(WDM)フィルタと、
前記波長分割マルチプレクサ(WDM)フィルタの出力部に直接的にまたは間接的に結合されたファラデー回転子ミラー(FRM)と、
を備える装置であって、
前記波長分割マルチプレクサ(WDM)フィルタの光出力は、反射ビームの偏光が前記ファラデー回転子ミラー(FRM)を通る伝送および前記ファラデー回転子ミラー(FRM)による反射の後、実質的に90度だけ回転されるように、前記ファラデー回転子ミラー(FRM)により部分的に反射され、次に、反射光信号が、前記波長分割マルチプレクサ(WDM)フィルタおよび前記光ファイバを通過し、前記ファラデー回転子(FR)を通過し、前記反射光信号の偏光が、前記ファラデー回転子(FR)により実質的にさらに45°だけ回転され、その後、前記反射光信号が前記FPレーザダイオードに戻って注入され、
前記FPレーザダイオードと前記ファラデー回転子との間に位置づけられていると共に前記FPレーザダイオードの光出力を受け、かつ出力光信号を変調して前記装置による伝送のための変調信号を生成するように結合された外部変調器(EM)をさらに備える装置。 - FPレーザダイオードと、
前記FPレーザダイオードの光出力を受けるように結合され、かつ前記光出力の偏光を実質的に45度だけ回転させるファラデー回転子(FR)と、
前記ファラデー回転子(FR)の出力を受けるために第一端部で結合された光ファイバと、
前記光ファイバからの光信号を受けるために前記光ファイバの第二端部に結合された波長分割マルチプレクサ(WDM)フィルタと、
前記波長分割マルチプレクサ(WDM)フィルタの出力部に直接的にまたは間接的に結合されたファラデー回転子ミラー(FRM)と、
を備える装置であって、
前記波長分割マルチプレクサ(WDM)フィルタの光出力は、反射ビームの偏光が前記ファラデー回転子ミラー(FRM)を通る伝送および前記ファラデー回転子ミラー(FRM)による反射の後、実質的に90度だけ回転されるように、前記ファラデー回転子ミラー(FRM)により部分的に反射され、次に、反射光信号が、前記波長分割マルチプレクサ(WDM)フィルタおよび前記光ファイバを通過し、前記ファラデー回転子(FR)を通過し、前記反射光信号の偏光が、前記ファラデー回転子(FR)により実質的にさらに45°だけ回転され、その後、前記反射光信号が前記FPレーザダイオードに戻って注入され、
前記ファラデー回転子と前記光ファイバとの間に位置づけられていると共に前記ファラデー回転子の光出力を受け、かつ出力光信号を変調して前記装置による伝送のための変調信号を生成するように結合された外部変調器(EM)をさらに備える装置。 - 前記波長分割マルチプレクサ(WDM)フィルタが、前記光ファイバからの出力光信号を受けるように結合された1つの入力部と、スプリッタに結合された出力部と、を有するアレイ導波路回折格子(AWG)WDMマルチプレクサの形態である請求項1または2に記載の装置。
- 前記波長分割マルチプレクサ(WDM)フィルタが、可変フィルタである請求項1または2に記載の装置。
- 外部変調器(EM)が、半導体光増幅器である請求項1〜4のいずれか一項に記載の装置。
- 外部変調器(EM)が、マッハツェンダ干渉計ベースの変調器である請求項1〜4のいずれか一項に記載の装置。
- 前記光ファイバが実質的に数百メートルから数キロメートルの長さを有する請求項1から6のいずれか一項に記載の装置。
- 前記FPレーザダイオードのFPキャビティモードを前記波長分割マルチプレクサ(WDM)フィルタに合致させる手段をさらに備える請求項1から7のいずれか一項に記載の装置。
- 前記手段が、前記FPレーザダイオードまたは前記波長分割マルチプレクサ(WDM)フィルタのいずれか一方または両方に取り付けられた加熱要素を備える請求項8に記載の装置。
- FPレーザダイオードと、
前記FPレーザダイオードの出力を受けるために第一端部で結合された光ファイバと、
前記光ファイバからの光信号を受けるために前記光ファイバの第二端部に結合された波長分割マルチプレクサ(WDM)フィルタと、
前記波長分割マルチプレクサ(WDM)フィルタの出力部に結合されたファラデー回転子ミラー(FRM)と、
を備える装置であって、
前記波長分割マルチプレクサ(WDM)フィルタの光出力は、反射ビームの偏光が前記FRMを通る伝送および前記FRMによる反射の後、実質的に90度だけ回転されるように、前記ファラデー回転子ミラー(FRM)により部分的に反射され、次に、反射光信号が、前記波長分割マルチプレクサ(WDM)フィルタおよび前記光ファイバを通過し、その後、前記FPレーザダイオードに戻って注入され、
前記FPレーザダイオードと前記光ファイバとの間に位置づけられていると共に前記FPレーザダイオードの光出力を受け、かつ出力光信号を変調して前記装置による伝送のための変調信号を生成するように結合された外部変調器(EM)をさらに備える装置。 - FPレーザダイオードと、
前記FPレーザダイオードの出力を受けるために第一端部で結合された偏波保持(PM)光ファイバと、
前記偏波保持(PM)光ファイバからの光信号を受けるために前記偏波保持(PM)光ファイバの第二端部に結合された波長分割マルチプレクサ(WDM)フィルタと、
前記波長分割マルチプレクサ(WDM)フィルタの出力部に結合されたミラーと、
を備える装置であって、
前記波長分割マルチプレクサ(WDM)フィルタの光出力が、前記ミラーにより部分的に反射され、次に、反射光信号が、前記波長分割マルチプレクサ(WDM)フィルタおよび偏波保持(PM)光ファイバを通過し、その後、前記FPレーザダイオードに戻って注入され、
前記FPレーザダイオードと前記偏波保持(PM)光ファイバとの間に位置づけられていると共に前記FPレーザダイオードの光出力を受け、かつ出力光信号を変調して前記装置による伝送のための変調信号を生成するように結合された外部変調器(EM)をさらに備える装置。 - FPレーザダイオードと、
光集積回路(PIC)チップであって、前記光集積回路(PIC)チップが複数の光学素子を含み、前記複数の光学素子が、
前記FPレーザダイオードからの光信号を受けるように前記光集積回路(PIC)チップを介して前記FPレーザダイオードに結合された外部変調器(EM)と、
前記外部変調器(EM)に結合された波長分割マルチプレクサ(WDM)フィルタと、
第一反射器に結合された第一アーム、および第二の光集積回路(PIC)チップの出力端部に結合された第二アームを有する光スプリッタと、
含む、光集積回路(PIC)チップと、
を備える装置であって、
前記波長分割マルチプレクサ(WDM)フィルタの光出力が前記第一反射器により部分的に反射され、次に、反射光信号が、前記光集積回路(PIC)チップを通過し、その後、前記FPレーザダイオードに戻って注入される装置。 - 前記光集積回路(PIC)チップの複数の光学素子が互いに、同じ基板の1つまたは2つ以上の集積光導波路を用いて結合されている請求項12に記載の装置。
- 1つまたは2つ以上の第二FPレーザダイオードであって、第二FPレーザダイオードのそれぞれが前記光集積回路(PIC)チップの対応する第二光導波路に結合され、各第二導波路が、それぞれの第二EM、第二WDMフィルタ、第二光スプリッタ、および第二反射器を含む対応する第二の複数の光学素子を結合する、1つまたは2つ以上の第二FPレーザダイオードをさらに備える請求項12または13に記載の装置。
- 自己シード波長分割多重受動光網(WDMPON)を備えるシステムであって、
前記自己シード波長分割多重受動光網(WDMPON)が、
第一の波長分割多重化(WDM)マルチプレクサの入力部に結合された1つまたは2つ以上の光回線終端装置(OLT)ポイントであって、各光回線終端装置が、
FPレーザダイオードと、
前記FPレーザダイオードからの出力光信号を受け、かつ前記出力光信号を入力としてファラデー回転子に供給する外部変調器(EM)と、
前記外部変調器(EM)の光出力を受けるように結合され、かつ前記光出力の偏光を実質的に45度だけ回転させる前記ファラデー回転子であって、前記ファラデー回転子の出力部が前記第一の波長分割多重化(WDM)マルチプレクサの入力部に結合される、前記ファラデー回転子と、
を含む、1つまたは2つ以上の光回線終端装置(OLT)ポイントと、
前記第一の波長分割多重化(WDM)マルチプレクサの出力部からの光信号を受ける第一スプリッタと、
前記第一スプリッタの1つ出力部に結合された第一ファラデー回転子ミラー(FRM)と、
第二スプリッタと、
前記第二スプリッタの1つの出力部に結合された第二ファラデー回転子ミラー(FRM)と、
前記第一スプリッタと前記第二スプリッタとの間に結合された光ファイバと、
前記第二スプリッタの入力部に結合された出力部を有する第二の波長分割多重化(WDM)マルチプレクサと、
前記第二の波長分割多重化(WDM)マルチプレクサの入力部に結合された、1つまたは2つ以上の光網終端装置(ONU)であって、前記各光網終端装置(ONU)が、
FPレーザダイオードと、
前記FPレーザダイオードの光出力を受けるように結合され、前記光出力の偏光を実質的に45度だけ回転させるファラデー回転子と、
前記ファラデー回転子からの出力光信号を受け、前記出力光信号を入力として前記第二の波長分割多重化(WDM)マルチプレクサに供給する外部変調器(EM)と、
を含む、1つまたは2つ以上の光網終端装置(ONU)と、
を含み、
それぞれの波長分割多重化(WDM)マルチプレクサの光出力が、それぞれのファラデー回転子ミラー(FRM)により部分的に反射されるシステム。 - 前記第一の波長分割多重化(WDM)マルチプレクサまたは前記第二の波長分割多重化(WDM)マルチプレクサの1つまたは2つ以上が、アレイ導波路(AWG)マルチプレクサの形態である請求項15に記載のシステム。
- FPレーザダイオードからの光出力を供給するステップと、
出力光信号をファイバを介して光マルチプレクサに結合させ、かつ前記出力光信号を多重化して多重化信号を生成するステップと、
前記多重化信号を分割し、かつ第一分割信号を生成するステップと、
前記第一分割信号を反射してFPレーザキャビティに戻すステップと、
前記FPレーザダイオードの1つのFPキャビティモードを前記光マルチプレクサにより発生される光通過帯域中心に合致させ、かつFPレーザ波長を単一モード動作にロックするステップと、
前記ファイバを通って伝搬し、かつ反射されて前記FPレーザダイオードに戻る光の偏光が前記FPレーザダイオードの偏光に合致するように制御するステップと、
を備え、
外部変調器(EM)を前記FPレーザダイオードと前記ファイバとの間に位置させ、前記FPレーザダイオードの光出力を受け、かつ出力光信号を変調して伝送のための変調信号を生成するように結合させるステップを、更に備える方法。
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