JP5755230B2 - インターリーブ・チャープド・アレイ導波路グレーティングを有するコヒーレント受信機 - Google Patents
インターリーブ・チャープド・アレイ導波路グレーティングを有するコヒーレント受信機 Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/67—Optical arrangements in the receiver
- H04B10/676—Optical arrangements in the receiver for all-optical demodulation of the input optical signal
- H04B10/677—Optical arrangements in the receiver for all-optical demodulation of the input optical signal for differentially modulated signal, e.g. DPSK signals
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- 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
- G02B6/12007—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 forming wavelength selective elements, e.g. multiplexer, demultiplexer
- G02B6/12009—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 forming wavelength selective elements, e.g. multiplexer, demultiplexer comprising arrayed waveguide grating [AWG] devices, i.e. with a phased array of waveguides
- G02B6/12014—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 forming wavelength selective elements, e.g. multiplexer, demultiplexer comprising arrayed waveguide grating [AWG] devices, i.e. with a phased array of waveguides characterised by the wavefront splitting or combining section, e.g. grooves or optical elements in a slab waveguide
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- 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
- G02B6/126—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 using polarisation effects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/65—Intradyne, i.e. coherent receivers with a free running local oscillator having a frequency close but not phase-locked to the carrier signal
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/67—Optical arrangements in the receiver
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/06—Polarisation multiplex systems
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Description
Lm=L0+mΔL (1)
を使用して表わされ、式中、mは、平面基板上の前記アームの横方向の空間的な並びのm番目の導波路アームを識別する指数である。ここで、m=0は、横方向の空間的な並びの第1番目のすなわち最も短いAWGアームに相当し、このAWGアームは長さL0を有し、Lmは、m番目のAWGアームの長さである。対照的に、インターリーブ・チャープドAWGにおいては、隣接するAWGアーム間の長さの差は、例えば周期的に調節することができ、指数mに依存する。数学的には、インターリーブ・チャープドAWGのこの特性は、近似的に式(2)
Lm=L0+mΔL+l(m mod M) (2)
を使用して表わされ、式中、Mはチャープパターンの周期であり、l(m mod M)は、指数mを周期Mで除した剰余に依存する離散的なアーム長変調関数である。チャープドAWGおよび非チャープドAWGには、ΔL=0で実現できるものがある。インターリーブ・チャープドAWGの設計および実現に関するさらなる詳細は、例えば本願の権利者が所有する米国特許第5,909,522号および第6,049,640号に見出すことができ、これら特許は両方ともその全体が参照により本明細書に組み込まれる。
Claims (9)
- 平坦な表面を有する基板と、
前記表面に沿って存在し、第1および第2の光入力端子、ならびに第1の空間配列した光出力端子を有する第1の光スターカプラと、
前記表面に沿って存在し、第2の空間配列した光入力端子および第3の空間配列した光出力端子を有する第2の光スターカプラと、
それぞれが、前記第1の空間配列の1つの光出力端子を前記第2の空間配列の対応する光入力端子に接続する導波路アームのアレイであって、前記第3の空間配列の第1の組の4つの光出力端子が、ほぼ同じ波長の前記第1および第2の光入力端子において受信される光に応答して、前記第1および第2の光入力端子において受信される前記光の4つの異なる相対位相の組合せを受信するように構成される、導波路アームのアレイと
を有するアレイ導波路グレーティング(AWG)を備える装置であって、
前記4つの異なる相対位相の組合せは、0、π/2ラジアン、πラジアン、及び3π/2ラジアンの相対位相を有する、前記第1および第2の光入力端子からの前記光の組合せである、装置。 - 前記導波路アームのアレイは、前記第3の配列の別の第2の組の4つの光出力端子が前記光の4つの異なる相対位相の第2の組合せを受信するように構成され、前記第2の組合せは、前記第3の配列の前記第1の組の光出力端子に出力される前記光の偏光とほほ直交する前記光の成分の偏光である、請求項1に記載の装置。
- 前記導波路アームのアレイは、前記第3の配列の別の第2の組の4つの光出力端子が前記光の4つの異なる相対位相の第2の組合せを受信するように構成され、前記第2の組合せは、前記第3の配列の前記第1の組の光出力端子に出力される前記光の波長とは異なる波長を有する、請求項1に記載の装置。
- 前記導波路アームの少なくともいくつかに対して、前記アームの少なくとも一部分は複屈折導波路を備える装置であって、
第1の偏光と前記第1の偏光にほぼ直交する第2の偏光との間で光電力を分配するように、前記第2の光入力端子において受信される前記光の偏光を変化させるように構成される偏光制御素子をさらに備える、請求項2に記載の装置。 - 前記AWGは、nチャネルの波長デマルチプレクサとして機能するようになされ、ここでnは1より大きい正の整数であって、
前記第3の空間配列した光出力端子が4n個の光出力端子を備え、それぞれは、(1)搬送波波長、ならびに(2)前記第1および第2の光入力端子に供給される前記光間の相対位相シフトの値のうちの少なくとも1つにおいて、残りの(4n−1)個の混合信号のそれぞれとは異なる、対応する混合信号を受信するためのものである、請求項3に記載の装置。 - それぞれが、前記第3の空間配列した光出力端子の対応する出力端子と光学的に結合され、対応する光出力信号を電気信号に変換するようになされた光検出器のアレイと、
前記光検出器のアレイによって生成された前記電気信号を対応するディジタル信号に変換するようになされたアナログ・ディジタル・コンバータと、
前記ディジタル信号を受信するディジタル信号プロセッサであって、
前記第1の光入力端子に供給される光入力信号が複数の独立に変調された成分を含み、
前記ディジタル信号プロセッサは、前記ディジタル信号を処理して前記独立に変調された成分のそれぞれによって搬送されたデータを復元するようになされ、前記複数の独立に変調された成分は2つ以上のWDM成分を有する、ディジタル信号プロセッサと
をさらに備える光受信機である、請求項1に記載の装置。 - 前記複数の独立に変調された成分は2つ以上のPDM成分も含む、請求項7に記載の装置。
- (a)平坦な表面を有する基板と、
前記表面に沿って存在し、第1および第2の光入力端子、ならびに第1の空間配列した光出力端子を有する第1の光スターカプラと、
前記表面に沿って存在し、第2の空間配列した光入力端子および第3の空間配列した光出力端子を有する第2の光スターカプラと、
それぞれが、前記第1の空間配列の1つの光出力端子を前記第2の空間配列の対応する光入力端子に接続する導波路アームのアレイと
を備える、アレイ導波路グレーティング(AWG)を設けるステップと、
(b)(1)光入力信号を第1の光入力端子に、および(2)局部発信器信号を前記AWGの第2の光入力端子に供給して、前記第3の空間配列の1組の4つの光出力端子において、前記光入力信号と前記局部発信器信号の4つの異なる相対位相の組合せを生成するステップであって、前記4つの異なる相対位相の組合せは、0、π/2ラジアン、πラジアン、及び3π/2ラジアンの相対位相を有する、前記第1および第2の光入力端子からの前記光の組合せである、ステップと
を含む光信号を処理する方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
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US12/541,548 | 2009-08-14 | ||
US12/541,548 US8275224B2 (en) | 2009-08-14 | 2009-08-14 | Coherent receiver having an interleave-chirped arrayed waveguide grating |
PCT/US2010/044958 WO2011019683A1 (en) | 2009-08-14 | 2010-08-10 | Coherent receiver having an interleave-chirped arrayed waveguide grating |
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JP2013501968A JP2013501968A (ja) | 2013-01-17 |
JP5755230B2 true JP5755230B2 (ja) | 2015-07-29 |
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US (1) | US8275224B2 (ja) |
EP (1) | EP2465218B1 (ja) |
JP (1) | JP5755230B2 (ja) |
KR (1) | KR101375995B1 (ja) |
CN (1) | CN102598548B (ja) |
MY (1) | MY157361A (ja) |
SG (1) | SG178397A1 (ja) |
WO (1) | WO2011019683A1 (ja) |
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US8275224B2 (en) | 2012-09-25 |
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JP2013501968A (ja) | 2013-01-17 |
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