JP2019158923A - 光スペクトル整形器及びそれを用いた光信号モニタ装置 - Google Patents
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Abstract
Description
図2は、本発明の第1の実施形態に係る光スペクトル整形器の構成を概略的に例示する。図2(a)及び(b)には、入力ポートである複数の入力ファイバ2111〜211Nと、出力ポートである複数の出力ファイバ2121〜212Nと、光導波路フロントエンド220と、光学素子群230と、SLM240と、を備えた光スペクトル整形器が示されている。
図8は、本発明の光スペクトル整形器を用いた第2の実施形態に係る光信号モニタ装置の構成を概略的に例示する。図8には、モニタ対象のN本の信号光が入力されるN本の主線光ファイバ3011〜301N中の信号光の一部をN本の接続ファイバ3021〜302Nに分岐するNアレーの光カプラ3031〜303Nと、光カプラ3031〜303Nでそれぞれ分岐された光信号を独立に制御可能なNアレーの光スペクトル整形器304と、光スペクトル整形器304からのN本の出力信号の光強度を独立に測定可能な受光部アレー305と、を備えた光信号モニタ装置が示されている。
図9は、本発明の第3の実施形態に係る光信号モニタ装置の構成を概略的に例示する。図9には、空間多重に対応した空間多重数がKであるN本の主線SDM光ファイバ4011〜401Nと、N本の接続SDMファイバ4021〜402Nと、N本の主線光SDMファイバ4011〜401N中の信号光の一部をN本の接続SDMファイバ4021〜402Nに分岐するNアレーのSDM光カプラ4031〜403Nと、SDM光カプラ4031〜403Nでそれぞれ分岐された信号光を独立に制御可能なNアレーのSDM光スペクトル整形器404と、SDM光スペクトル整形器404から出力された信号光をシングルモードファイバ(SMF)407に分離するファンイン・ファンアウト(FIFO)部406と、FIFO部406においてファンアウトされた(N×K)本の信号光の光強度を独立に測定可能な受光部アレー405と、FIFO部406と受光部アレー405との間を接続する(N×K)本のSMF407と、を備えた光信号モニタ装置が示されている。
図12及び図13を用いて、本発明の第4の実施形態に係る光信号モニタ装置を説明する。上述した第2及び第3の実施形態に係る光信号モニタ装置では、各々光スペクトル整形器の外側に受光部アレーが必要であった。本実施の形態では、OSNRモニタ機能を削減する代わりに、受光部アレーを必要としない形態について述べる。
Claims (8)
- 信号光を入力する複数の入力ファイバと、
前記信号光を出力する複数の出力ファイバと、
前記複数の入力ファイバの各々から出射された各信号光のビーム径を拡大しつつ、前記信号光毎に異なる角度で出射する入力側導波路部と、入力した信号光の各々を導波して前記複数の出力ファイバの各々に結合する出力側導波路部と、を含む光導波路フロントエンドと、
平面上にマトリックス状に配列された複数の画素と前記複数の画素を駆動する駆動部とを有し、前記複数の画素の位相パタンを前記駆動部によって制御することにより入力した各信号光の位相を変化させてそれぞれ出射する空間光変調器であって、各信号光が入射する画素領域毎に特定の位相パタンが設定されている空間光変調器と、
前記光導波路フロントエンドの前記入力側導波路部から出射された前記信号光の各々を前記空間光変調器上のそれぞれ異なる前記画素の位置に集光するように配置された光学素子群であって、前記空間光変調器から出射された光を前記光導波路フロントエンドの前記出力側導波路部に結合させるように配置された光学素子群と、
を備えることを特徴とする光スペクトル整形器。 - 前記光導波路フロントエンドの前記入力側導波路部は、前記複数の入力ファイバから入力される各信号光を導波する複数の第1の入力導波路部と、前記複数の第1の入力導波路部の各々から入力した信号光の光ビーム径を拡大しつつ拡散して導波する入力側スラブ導波路と、前記入力側スラブ導波路で拡散された信号光がそれぞれ入射する複数の第2の入力導波路部と、前記複数の第2の入力導波路部の各々からそれぞれ出射された信号光の波面に応じて出射角を変換して前記光学素子群に出力する光フェーズドアレー出射部と、を含み、
前記光導波路フロントエンドの前記出力側導波路部は、前記空間光変調器から前記光学素子群を介して出力される信号光を入力する光フェーズドアレー入射部と、前記光フェーズドアレー入射部に入射した各信号光をそれぞれ伝搬する複数の第1の出力導波路部と、前記複数の第1の出力導波路部の各々から入力した信号光を導波する出力スラブ導波路と、前記出力スラブ導波路から入力される各信号光を導波して前記複数の出力ファイバに出力する第2の出力導波路部と、を含むことを特徴とする請求項1に記載の光スペクトル整形器。 - 前記光学素子群は、入射した信号光を波長分散する回折格子と、前記回折格子によって波長分散された信号光を前記空間光変調器上のそれぞれ異なる前記画素の位置に集光するフーリエレンズと、を少なくとも含むことを特徴とする請求項1又は2に記載の光スペクトル整形器。
- 請求項1乃至3のいずれかに記載の光スペクトル整形器と、
複数の主線光ファイバの光信号を分岐して前記複数の入力ファイバに入力する光カプラと、
前記光スペクトル整形器から出力された複数の信号光の強度を測定する受光部アレーと、
前記受光部アレーでそれぞれ測定した光の強度に基づいて、前記信号光の各々についてのモニタ内容に応じた測定値を算出する算出手段と、
を備えたことを特徴とする光信号モニタ装置。 - 前記算出手段は、前記受光部アレーで測定された前記複数の信号光の強度と、前記信号光が前記受光部アレーに結合する際の光学系で発生する光損失の値とに基づいて、前記複数の入力ファイバの各々を伝搬する信号光の強度を算出することを特徴とする請求項4に記載の光信号モニタ装置。
- 前記空間光変調器は、出射する信号光を2分岐し、当該2分岐された光信号を前記受光部アレーにおける単一の受光部に結合させることにより遅延干渉計を形成するように構成され、
前記受光部アレーは、2分岐された光信号が遅延干渉した後の光の光強度を測定し、
前記算出手段は、前記遅延干渉した後の光の光強度の最大値と最小値との比率からOSNRを算出することを特徴とする請求項4に記載の光信号モニタ装置。 - 前記複数の主線光ファイバは、空間多重された信号光を伝搬するSDM対応の光ファイバであり、
前記光信号モニタ装置は、前記空間多重された信号光をシングルモードファイバ変換するファンイン・ファンアウト部をさらに備えたことを特徴とする請求項4乃至6のいずれかに記載の光信号モニタ装置。 - 信号光を入力する複数の入力ファイバと、
前記信号光を出力する複数の出力ファイバと、
前記複数の入力ファイバの各々から出射された各信号光のビーム径を拡大しつつ、前記信号光毎に異なる角度で出射する入力側導波路部を含む光導波路フロントエンドと、
平面上にマトリックス状に配列された複数の画素によって構成されるイメージセンサと、
前記光導波路フロントエンドの前記入力側導波路部から出射された前記信号光の各々を前記イメージセンサ上のそれぞれ異なる前記画素の位置に集光するように配置された光学素子群とを備え、
前記イメージセンサでそれぞれ測定した光の強度に基づいて、前記複数の入力ファイバの各々を伝搬する信号光の強度を算出する算出手段と、
を備えたことを特徴とする光信号モニタ装置。
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