JP6920302B2 - 表面結合システム - Google Patents
表面結合システム Download PDFInfo
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- JP6920302B2 JP6920302B2 JP2018532042A JP2018532042A JP6920302B2 JP 6920302 B2 JP6920302 B2 JP 6920302B2 JP 2018532042 A JP2018532042 A JP 2018532042A JP 2018532042 A JP2018532042 A JP 2018532042A JP 6920302 B2 JP6920302 B2 JP 6920302B2
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- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
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- H01S5/30—Structure or shape of the active region; Materials used for the active region
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- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
- G02B2006/12133—Functions
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2746—Optical coupling means with polarisation selective and adjusting means comprising non-reciprocal devices, e.g. isolators, FRM, circulators, quasi-isolators
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- H01S5/00—Semiconductor lasers
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- H01S5/00—Semiconductor lasers
- H01S5/10—Construction or shape of the optical resonator, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region
- H01S5/1028—Coupling to elements in the cavity, e.g. coupling to waveguides adjacent the active region, e.g. forward coupled [DFC] structures
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- H01S5/2004—Confining in the direction perpendicular to the layer structure
- H01S5/2018—Optical confinement, e.g. absorbing-, reflecting- or waveguide-layers
- H01S5/2027—Reflecting region or layer, parallel to the active layer, e.g. to modify propagation of the mode in the laser or to influence transverse modes
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Description
システムは、表面結合端面発光レーザであって、コア導波路、表面結合端面発光レーザの、コア導波路と同じ層中でコア導波路に光学的に結合されたファンアウト領域、及びファンアウト領域内に形成された第一の表面格子を含む表面結合端面発光レーザと、光集積回路(PIC:photonic integrated circuit)であって、光学導波路及びPICの上層中に形成された第二の表面格子を含み、第二の表面格子は、第一の表面格子と光軸合わせされている、光集積回路(PIC)とを含み得る。
式4中、mは、整数であり、nは、誘電体636の屈折率であり、θは、垂直と、上方に回折する光の伝播方向との間の角度であり、λは、光ビームの波長である。
図7は、本明細書に記載の少なくとも1つの実施形態により配置された他の例示的な表面結合端面発光レーザ(以下「レーザ」という)のパッシブ部分732を示す。パッシブ部分732を含むレーザは、本明細書で説明する表面結合システムの1つ又は複数で実装され得る。パッシブ部分732は、第一の回折格子706に光学的に結合された導波路コア742を含み得る。第一の回折格子706は、他方の第一の回折格子及び/又は本明細書で説明される第一の表面格子に対応し得る。パッシブ部分732はまた、導波路コア742及び第一の表面格子706の下の下部クラッドとしての基板734と、導波路コア742及び第一の表面格子706の上方の上部クラッド736も含み得る。上部クラッド736、導波路コア742、下部クラッド734が共に導波路744を形成し得る。この例では、光ビームは、導波路744中を右から左の方向に伝播し得る。光ビームは、導波路744中を、光ビームが第一の回折格子706によって下部クラッド734の方向に回折されるまで進み得る。回折光ビームの一部又は全部は、下部クラッド734を通ってそこから外へ伝播し得る。
1)弱く長い格子により、結合ビームを8〜40μm又はさらには20〜40μmに拡張できること、
a.→格子ピッチは最大に調節される、
2)導波路の十分に強力な閉じ込めにより、ビームを横方向に回折させて、約8〜40μm又はさらには20〜40μmのビームサイズを実現できること。
図31は、本明細書に記載の少なくとも1つの実施形態により配置された他の例示的な表面結合システム3200を示す。システム3200は、図30A及び30Bのシステム3100と同様であるが、例外として、レーザ3202とInP MZ変調器3207とは完全に分離され、それによって設置公差の点で有利であり、InPチップの全体的なコストが削減される。
Claims (25)
- システムであって、
表面結合端面発光レーザであって、
コア導波路と、
該コア導波路と同じ前記表面結合端面発光レーザの層内で前記コア導波路に光学的に結合されたファンアウト領域と、
前記ファンアウト領域内に形成された第一の表面格子と、
前記コア導波路の下の1つ又は複数の下層であって、前記表面結合端面発光レーザによって発せられる光を実質的に透過させる前記1つ又は複数の下層と、
分布帰還型(DFB)レーザを含むアクティブ部分であって、前記分布帰還型レーザは、前記1つ又は複数の下層の上方に位置付けられ、且つ前記コア導波路にエンドツーエンドで光学的に結合される、前記アクティブ部分と、
コア領域と前記ファンアウト領域とを含むパッシブ部分であって、前記アクティブ部分にエンドツーエンドで光学的に結合される前記パッシブ部分と、を含む前記表面結合端面発光レーザと、
光集積回路(PIC)であって、該光集積回路は、光学導波路及び前記光集積回路の上層内に形成された第二の表面格子を含み、前記第二の表面格子は、前記第一の表面格子と光軸合わせされている、前記光集積回路と、
前記第一の表面格子と前記第二の表面格子との間に位置付けられた光学アイソレータと、を備え、
前記光学アイソレータは、ガーネットを含み、
入力偏光子は、前記ガーネットの上面に結合されており、及び出力偏光子は、前記ガーネットの下面に結合されている、システム。 - 前記第一の表面格子は、前記コア導波路から受け取られた光を前記第二の表面格子に向かって下方に方向転換するように構成され、
前記第二の表面格子は、前記第一の表面格子からの前記光を、前記光が前記光学アイソレータを通った後に受け取るように位置付けられ、
前記第二の表面格子は、前記第一の表面格子から受け取られた光を前記光学導波路へ方向転換するように構成される、請求項1に記載のシステム。 - 前記第一の表面格子及び前記第二の表面格子の各々は、8〜40μmのサイズを有する回折スポットを生成するように構成される、請求項1に記載のシステム。
- 前記第一の表面格子は、10マイクロメートル(μm)超の長さを有し、
前記第二の表面格子は、10μm超の長さを有する、請求項3に記載のシステム。 - 前記光学アイソレータは、300〜800マイクロメートル(μm)の範囲の物理的厚さを有する、請求項1に記載のシステム。
- 前記光学アイソレータの上面及び前記光学アイソレータの下面の各々の表面積は、200μm2未満である、請求項1に記載のシステム。
- 前記パッシブ部分は、前記第一の表面格子の上方に位置付けられた上部ミラーを含む、請求項1に記載のシステム。
- 前記表面結合端面発光レーザは、前記アクティブ部分及び前記パッシブ部分に形成されたリッジ構造をさらに含み、
前記リッジ構造は、
前記アクティブ部分内の、前記アクティブ部分の多重量子井戸層の深さより上の深さまで下方に延びる浅いリッジと、
前記パッシブ部分内の、前記多重量子井戸層の前記深さより下の深さまで下方に延びる深いリッジと、を含む、請求項1に記載のシステム。 - 前記表面結合端面発光レーザは、直接変調レーザ(DML)を含む、請求項1に記載のシステム。
- 前記光集積回路に機械的且つ電気的に結合された電気集積回路(EIC)をさらに備え、
電気信号は、前記電気集積回路から前記光集積回路のトレースを通じて前記表面結合端面発光レーザに搬送される、請求項9に記載のシステム。 - 前記光集積回路は、光学マルチプレクサをさらに含む、請求項10に記載のシステム。
- 前記第一の表面格子は、集光格子を含む、請求項1に記載のシステム。
- 基板をさらに備え、
前記表面結合端面発光レーザは、p側を下にして前記基板に結合される、請求項9に記載のシステム。 - 前記基板に取り付けられ、且つ前記表面結合端面発光レーザに通信可能に結合されたドライバ又はクロック及びデータリカバリ(CDR)回路の少なくとも1つをさらに備える請求項13に記載のシステム。
- 前記光集積回路の前記光学導波路は、窒化シリコン(SiN)導波路を含み、
前記システムは、インタポーザをさらに備え、
前記インタポーザは、
インタポーザ導波路であって、前記インタポーザ導波路の一方の端において前記窒化シリコン導波路に断熱的に結合され、且つ前記インタポーザ導波路の反対の端において光ファイバに突き合わせ結合された前記インタポーザ導波路を含む、請求項9に記載のシステム。 - 前記光集積回路の前記光学導波路は、シリコン(Si)導波路を含み、
前記光集積回路は、前記シリコン導波路に断熱的に結合された窒化シリコン(SiN)導波路をさらに含み、
前記システムは、インタポーザをさらに備え、
前記インタポーザは、
インタポーザ導波路であって、前記インタポーザ導波路の一方の端において前記窒化シリコン導波路に断熱的に結合され、且つ前記インタポーザ導波路の反対の端において光ファイバに突き合わせ結合された前記インタポーザ導波路を含む、請求項9に記載のシステム。 - 前記第二の表面格子は、窒化シリコン(SiN)回折格子を含む、請求項1に記載のシステム。
- 前記第一の表面格子と前記第二の表面格子との間の作動距離は、少なくとも100マイクロメートルである、請求項1に記載のシステム。
- 前記第一の表面格子のスポットサイズは、8マイクロメートル(μm)〜40μmの範囲である、請求項1に記載のシステム。
- 前記表面結合端面発光レーザは、リン化インジウムを含む、請求項1に記載のシステム。
- 前記表面結合端面発光レーザは、ハイブリッドレーザを含む、請求項1に記載のシステム。
- 前記第一の表面格子と前記第二の表面格子との間の第一の光路内にレンズが配置されていない、請求項1に記載のシステム。
- システムであって、
表面結合端面発光光増幅器であって、コア導波路、前記コア導波路と同じ前記表面結合端面発光光増幅器の層内で前記コア導波路の第一の端に光学的に結合された第一のファンアウト領域、前記第一のファンアウト領域内に形成された第一の表面格子、前記コア導波路と同じ前記表面結合端面発光光増幅器の層内で前記コア導波路の第二の端に光学的に結合された第二のファンアウト領域、及び前記第二のファンアウト領域内に形成された第二の表面格子を含む表面結合端面発光光増幅器と、
光集積回路(PIC)であって、第一の光学導波路、第二の光学導波路、前記光集積回路の上層内に形成され、且つ前記第一の光学導波路に光学的に結合された第三の表面格子、及び前記光集積回路の前記上層内に形成され、且つ前記第二の光学導波路に光学的に結合された第四の表面格子を含む前記光集積回路と、前記第一の表面格子と前記第三の表面格子との間に位置付けられた光学アイソレータと、を備え、
前記第三の表面格子は、前記表面結合端面発光光増幅器の前記第一の表面格子と光軸合わせされており、及び前記第四の表面格子は、前記表面結合端面発光光増幅器の前記第二の表面格子と光軸合わせされ、
前記光学アイソレータは、ガーネットを含み、
入力偏光子は、前記ガーネットの上面に結合されており、及び出力偏光子は、前記ガーネットの下面に結合されている、システム。 - 前記第一の表面格子と前記第三の表面格子との間及び前記第二の表面格子と前記第四の表面格子との間の作動距離は、少なくとも50マイクロメートルである、請求項23に記載のシステム。
- 前記第一の表面格子及び前記第三の表面格子の各々のスポットサイズは、8マイクロメートル(μm)〜40μmの範囲である、請求項23に記載のシステム。
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US10243322B2 (en) | 2019-03-26 |
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EP4160833A1 (en) | 2023-04-05 |
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