JP2022552088A - 光コムの発生方法及び装置 - Google Patents
光コムの発生方法及び装置 Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 45
- 238000005086 pumping Methods 0.000 claims abstract description 36
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
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- G—PHYSICS
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- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/10007—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers
- H01S3/10013—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating in optical amplifiers by controlling the temperature of the active medium
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/105—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling the mutual position or the reflecting properties of the reflectors of the cavity, e.g. by controlling the cavity length
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/106—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity
- H01S3/108—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering
- H01S3/1086—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating by controlling devices placed within the cavity using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering using scattering effects, e.g. Raman or Brillouin effect
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Abstract
Description
非線形光共振器の熱的安定状態にマッチングした励起光(ポンプ光、pump light)を受光して前記非線形光共振器内で発振させるステップと、
前記非線形光共振器を調整して、前記励起光に対応するブリルアン利得を前記非線形光共振器における目標縦モードと重ね合わせるステップと、
前記励起光の励起出力(ポンピングパワー)がブリルアンレーザーを発生させる閾値を超えた場合に、前記目標縦モードでブリルアンレーザーを継続的に発生させるステップと、
ブリルアンレーザーはカー非線形四波混合プロセスにより光ソリトンを含める光コムを発生させるステップと、を含む光コムの発生方法を提供する。
前記非線形光共振器のキャビティ長を調整することにより、前記目標縦モードの位置を調整して、前記目標縦モードを前記ブリルアン利得と重ね合わせるステップを含む。
前記非線形光共振器が受ける応力を変更することにより、前記ブリルアン利得の位置を調整して、前記ブリルアン利得を前記目標縦モードと重ね合わせるステップであって、非線形光共振器のキャビティ本体をねじることにより応力を調整することができ、ねじる角度は最大で180°に達することができるステップをさらに含む。
前記非線形光共振器の温度を変更することにより、前記ブリルアン利得の位置を調整して、前記ブリルアン利得を前記目標縦モードと重ね合わせるステップであって、温度調整の範囲は-10℃~+90℃であるステップを含む。
非線形光共振器に連続的な励起光を出射するための励起源であって、前記励起源は制御されて前記励起光の波長を変更して、前記励起光の波長を非線形光共振器の熱的安定状態にマッチングさせることができ、さらに前記励起光を非線形光共振器の熱的安定状態で発振させ前記非線形光共振器から正常に出射させることができる励起源と、
非線形光共振器であって、受光した励起光を前記非線形光共振器における第1のセットの縦モードのうち或る縦モードに合わせるためのものであり、前記非線形光共振器は制御されて前記励起光に対応するブリルアン利得の位置を変更し又は前記非線形光共振器における第2のセットの縦モードのうち目標縦モードの位置を変更して、前記ブリルアン利得を前記目標縦モードと重ね合わせ、また、前記非線形光共振器は、前記励起光の励起出力がブリルアンレーザを発生させる閾値を超えた場合に、前記目標縦モードでブリルアンレーザを継続的に発生させ、ここで、ブリルアンレーザはカー非線形四波混合プロセスにより光コムを発生させる非線形光共振器と、を含む光コムの発生装置をさらに提供する。
次に、励起光は共振器の熱的安定状態で動作し、そのため、発生した光コムは自走受動安定性に優れかつ数時間維持でき、レーザ機器の周波数ジッタ、共振器の熱ドリフトなどによる攪乱によく抵抗することができ、従来のカー光コムは受動安定性が低く、攪乱を受けるとソリトン状態が失いやすくなり、
さらに、ブリルアンレーザは線幅狭窄化の特性を有し、すなわち共振器において共振するブリルアンレーザは励起光より狭い線幅を有し、通常、線幅の狭窄化効果は1000倍以上に達することができ、さらにブリルアンレーザにより発生される光コムも同様な線幅狭窄化の特性を有し、このように、励起光の線幅に対する要求を大幅に低下させ、従来のカー光コムについては、四波混合機構によりカー光コムの線幅は必ず励起光の線幅以上であり、
最後に、本発明の実施例で発生される光コムは量子雑音限界に達することができる位相雑音レベル-180dBc/Hzを有し、マイクロ波光子学などの分野で比較的高い利用価値を有し、従来のカー光コムは量子雑音限界の位相雑音レベルが一般的に150-160dBc/Hzのレベルである。
Claims (12)
- 非線形光共振器の熱安定状態にマッチングした励起光を受光して前記非線形光共振器内で発振させるステップと、
前記非線形光共振器を調整して、前記励起光に対応するブリルアン利得を前記非線形光共振器における目標縦モードと重ね合わせるステップと、
前記励起光の励起出力がブリルアンレーザを発生させる閾値を超えた場合に、前記目標縦モードでブリルアンレーザを継続的に発生させるステップと、
ブリルアンレーザはカー非線形四波混合プロセスにより、光ソリトンを含める光コムを発生するステップと、を含むことを特徴とする光コムの発生方法。 - 前記非線形光共振器を調整して、前記励起光に対応するブリルアン利得を前記非線形光共振器における目標縦モードと重ね合わせるステップは、
前記非線形光共振器のキャビティ長を調整することにより、前記目標縦モードの位置を調整して、前記目標縦モードを前記ブリルアン利得と重ね合わせるステップを含むことを特徴とする請求項1に記載の発生方法。 - 前記非線形光共振器を調整して、前記励起光に対応するブリルアン利得を前記非線形光共振器における目標縦モードと重ね合わせるステップは、
前記非線形光共振器が受ける応力を変更することにより、前記ブリルアン利得の位置を調整して、前記ブリルアン利得を前記目標縦モードと重ね合わせるステップであって、非線形光共振器のキャビティ本体をねじることにより応力を調整することができ、ねじる角度は最大で180°に達することができるステップをさらに含むことを特徴とする請求項1に記載の発生方法。 - 前記非線形光共振器を調整して、前記励起光に対応するブリルアン利得を前記非線形光共振器における目標縦モードと重ね合わせるステップは、
前記非線形光共振器の温度を変更することにより、前記ブリルアン利得の位置を調整して、前記ブリルアン利得を前記目標縦モードと重ね合わせるステップであって、温度調整の範囲は-10℃~+90℃であるステップをさらに含むことを特徴とする請求項1に記載の発生方法。 - 前記励起光の波長を調整することにより、前記励起光に対応するブリルアン利得を前記非線形光共振器における目標縦モードと重ね合わせることもでき、ただし、前記励起光の波長の調整範囲は1540nm~1565nmであることを特徴とする請求項1に記載の発生方法。
- 発生した光コムは、等周波数間隔で配列された離散スペクトルを有し、非線形光共振器の熱的安定状態の条件下で発生し、ブリルアンレーザがカー効果により励起したものであることを特徴とする請求項1に記載の発生方法。
- 発生した光コムの1本の櫛歯の線幅が励起光の線幅より小さいことを特徴とする請求項1に記載の発生方法。
- 能動的制御がない場合に、発生した光コムの雑音は非線形マイクロキャビティに対応する量子雑音限界に達することができることを特徴とする請求項1に記載の発生方法。
- 非線形光共振器に連続的な励起光を発するための励起源であって、前記励起源は制御されて前記励起光の波長を変更して、前記励起光の波長を非線形光共振器の熱的安定状態にマッチングさせることができ、さらに前記励起光を非線形光共振器の熱的安定状態で発振させ前記非線形光共振器から正常に出射させることができる励起源と、
非線形光共振器であって、受光した励起光を前記非線形光共振器における第1のセットの縦モードのうち或る縦モードに合わせるためのものであり、前記非線形光共振器は制御されて前記励起光に対応するブリルアン利得の位置を変更し又は前記非線形光共振器における第2のセットの縦モードのうち目標縦モードの位置を変更して、前記ブリルアン利得を前記目標縦モードと重ね合わせ、また、前記非線形光共振器は、前記励起光の励起出力がブリルアンレーザを発生させる閾値を超えた場合に、前記目標縦モードでブリルアンレーザを継続的に発生させ、ここで、ブリルアンレーザはカー非線形四波混合プロセスにより光コムを発生させる非線形光共振器と、を含むことを特徴とする光コムの発生装置。 - 前記非線形光共振器はブリルアン非線形及びカー非線形の両方を有することを特徴とする請求項9に記載の発生装置。
- 前記非線形光共振器は進行波共振器又は定在波共振器であってもよいことを特徴とする請求項9に記載の発生装置。
- 前記非線形光共振器における縦モードは、非線形光共振器の異なる偏光モード又は異なる次数の横モードにより導入することができることを特徴とする請求項9に記載の発生装置。
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