JP7338787B2 - 光ファイバ増幅器及び希土類添加光ファイバ - Google Patents
光ファイバ増幅器及び希土類添加光ファイバ Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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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
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06729—Peculiar transverse fibre profile
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- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
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- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
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- G—PHYSICS
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- G02B3/00—Simple or compound lenses
- G02B3/02—Simple or compound lenses with non-spherical faces
- G02B3/08—Simple or compound lenses with non-spherical faces with discontinuous faces, e.g. Fresnel lens
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
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- G02B6/32—Optical coupling means having lens focusing means positioned between opposed fibre ends
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- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
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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
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
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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
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06729—Peculiar transverse fibre profile
- H01S3/06733—Fibre having more than one cladding
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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
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06729—Peculiar transverse fibre profile
- H01S3/06737—Fibre having multiple non-coaxial cores, e.g. multiple active cores or separate cores for pump and gain
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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
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
- H01S3/094019—Side pumped fibre, whereby pump light is coupled laterally into the fibre via an optical component like a prism, or a grating, or via V-groove coupling
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
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- H—ELECTRICITY
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
- H01S3/1608—Solid materials characterised by an active (lasing) ion rare earth erbium
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
- H01S3/1611—Solid materials characterised by an active (lasing) ion rare earth neodymium
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
- H01S3/1613—Solid materials characterised by an active (lasing) ion rare earth praseodymium
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
- H01S3/1616—Solid materials characterised by an active (lasing) ion rare earth thulium
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- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/14—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range characterised by the material used as the active medium
- H01S3/16—Solid materials
- H01S3/1601—Solid materials characterised by an active (lasing) ion
- H01S3/1603—Solid materials characterised by an active (lasing) ion rare earth
- H01S3/1618—Solid materials characterised by an active (lasing) ion rare earth ytterbium
Description
本開示は、励起光パワー密度が低くなる希土類添加光ファイバ内において、集光作用を発生する構造を付与することで希土類添加光ファイバ内の励起光パワー密度を高め、光光変換効率を改善する。特に本開示は、希土類添加光ファイバを作製後に、レーザー等により後から所望の構造を形成可能なことを特徴とする。
図1に、本実施形態例に係る光ファイバ増幅器の一例を示す。本実施形態例に係る光ファイバ増幅器は、クラッド部82を伝搬する励起光を用いて、コア部81を伝搬する信号光を増幅するクラッド励起型の光ファイバ増幅器である。コア部81には、添加する希土類イオンとしてエルビウムが添加されている。
本実施形態例は、図2(a)に示すように希土類添加光ファイバ92内に、ファイバ長手方向に集光可能とするグレーデッドインデックス(GI)のクラッド部83を有する。屈折率分布形状を図2(b)に示す。クラッド部83に励振された励起光は、ファイバ長手方向に伝搬するに従って、コア部81の方へ集光され実質的なコア励起に近い状態になる。またGI構造については、ファイバ母材製造時に添加イオンの分布を調整することで付与するのが一般的だが、フェムト秒レーザー等を用いて屈折率変化を誘起し形成することも可能である。
本実施形態例は、図3に示すように希土類添加光ファイバ91内に、励起光導入部32を用いて希土類添加光ファイバ91の側面から入射された励起光をコア部81に結合すると同時に集光するグレーティングカプラ31を希土類添加光ファイバ91内に具備する。またグレーティング構造については、フェムト秒レーザー等を用いて屈折率変化を誘起し形成することが可能である。
本実施形態例は、図4に示すように複数のコア部81A,81B,81Cを有する希土類の添加されたマルチコア光ファイバ93内に、クラッド部82内の励起光のパワー密度を均一化するフレネルレンズ41とファイバ長手方向に集光可能とする半球状のレンズ12を具備する。実施形態例1と同様に、空間伝搬する領域11は、空洞であったり、又は領域11の周辺部のガラスよりも低屈折率の材料で形成されていたりする。
本開示により、クラッド励起型希土類添加光ファイバ増幅器においても、コア励起型と同等の光光変換効率を実現可能である。またマルチコア光ファイバ増幅器ではコアの利得差を減少させる効果も有する。
希土類添加光ファイバの長手方向にクラッド励起光を集光する構造を有し、その結果、光光変換効率を改善できる。
11:領域
12:レンズ
31:グレーティングカプラ
32:励起光導入部
41:フレネルレンズ
81、81A、81B、81C:コア部
82、83:クラッド部
91、92:希土類添加光ファイバ
93:マルチコア光ファイバ
Claims (4)
- 希土類添加光ファイバの長手方向の少なくとも一部に、クラッド部を伝搬する励起光をコア部に集光可能な屈折率分布構造を有する光ファイバ増幅器であって、
前記希土類添加光ファイバ内に形成されている空洞部又は低屈折率部と、
前記空洞部又は前記低屈折率部に接している一方のコア部及び当該コア部の周囲のクラッド部で形成されているレンズと、を有し、
前記レンズに含まれるクラッド部から放射された励起光が前記空洞部又は前記低屈折率部を伝搬後、前記空洞部又は前記低屈折率部に接している他方のコア部に結合することを特徴とする、光ファイバ増幅器。 - 前記希土類添加光ファイバのコア部の表面又は近傍に、前記希土類添加光ファイバのクラッド部の屈折率変化で形成されたグレーティングを有し、
前記グレーティングに向けて励起光を入力する励起光導入部が、前記希土類添加光ファイバの側面に設置されていることを特徴とする、
請求項1記載の光ファイバ増幅器。 - 前記希土類添加光ファイバが、複数のコア部を有するマルチコア光ファイバであり、
前記マルチコア光ファイバのクラッド部に、クラッド部の屈折率変化で形成されたフレネルレンズを有することを特徴とする
請求項1または2記載の光ファイバ増幅器。 - 請求項1~3のいずれか記載の光ファイバ増幅器に用いられる前記希土類添加光ファイバ。
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PCT/JP2020/014645 WO2021199193A1 (ja) | 2020-03-30 | 2020-03-30 | 光ファイバ増幅器及び希土類添加光ファイバ |
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Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001332788A (ja) | 2000-05-23 | 2001-11-30 | Mitsubishi Electric Corp | 増幅用光ファイバ |
JP2004138720A (ja) | 2002-10-16 | 2004-05-13 | Hitachi Cable Ltd | 光部品及びその製造方法 |
JP2005115176A (ja) | 2003-10-09 | 2005-04-28 | Internatl Business Mach Corp <Ibm> | 分光素子、回折格子、複合回折格子、カラー表示装置、分波器、および回折格子の製造方法 |
JP2005196089A (ja) | 2004-01-09 | 2005-07-21 | Furukawa Electric Co Ltd:The | ファイバブラッググレーティング素子 |
JP2007094350A (ja) | 2005-09-28 | 2007-04-12 | Korea Electronics Telecommun | 光ファイバを利用した波長選別式光集束装置及びそれを利用した光モジュール |
JP2009187010A (ja) | 2008-02-11 | 2009-08-20 | Gwangju Inst Of Science & Technology | フレネルレンズ一体型光ファイバ及びその製造方法{FiberLensWithFresnelZonePlateLensAndMethodForProducingTheSame} |
JP2010108999A (ja) | 2008-10-28 | 2010-05-13 | Fujikura Ltd | 光ファイバ及び光ファイバ増幅器 |
WO2012172996A1 (ja) | 2011-06-16 | 2012-12-20 | 古河電気工業株式会社 | マルチコア増幅光ファイバ |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH1093176A (ja) * | 1996-09-11 | 1998-04-10 | Hitachi Ltd | 光ファイバアンプ及び光ファイバ型光増幅装置 |
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2020
- 2020-03-30 WO PCT/JP2020/014645 patent/WO2021199193A1/ja active Application Filing
- 2020-03-30 JP JP2022512930A patent/JP7338787B2/ja active Active
- 2020-03-30 US US17/913,097 patent/US20230163554A1/en active Pending
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2001332788A (ja) | 2000-05-23 | 2001-11-30 | Mitsubishi Electric Corp | 増幅用光ファイバ |
JP2004138720A (ja) | 2002-10-16 | 2004-05-13 | Hitachi Cable Ltd | 光部品及びその製造方法 |
JP2005115176A (ja) | 2003-10-09 | 2005-04-28 | Internatl Business Mach Corp <Ibm> | 分光素子、回折格子、複合回折格子、カラー表示装置、分波器、および回折格子の製造方法 |
JP2005196089A (ja) | 2004-01-09 | 2005-07-21 | Furukawa Electric Co Ltd:The | ファイバブラッググレーティング素子 |
JP2007094350A (ja) | 2005-09-28 | 2007-04-12 | Korea Electronics Telecommun | 光ファイバを利用した波長選別式光集束装置及びそれを利用した光モジュール |
JP2009187010A (ja) | 2008-02-11 | 2009-08-20 | Gwangju Inst Of Science & Technology | フレネルレンズ一体型光ファイバ及びその製造方法{FiberLensWithFresnelZonePlateLensAndMethodForProducingTheSame} |
JP2010108999A (ja) | 2008-10-28 | 2010-05-13 | Fujikura Ltd | 光ファイバ及び光ファイバ増幅器 |
WO2012172996A1 (ja) | 2011-06-16 | 2012-12-20 | 古河電気工業株式会社 | マルチコア増幅光ファイバ |
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WO2021199193A1 (ja) | 2021-10-07 |
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