JP5611328B2 - ラマン・レーザ発振(Ramanlasing)用途における使用のためのフィルタ・ファイバおよびそれを製造するための技術 - Google Patents
ラマン・レーザ発振(Ramanlasing)用途における使用のためのフィルタ・ファイバおよびそれを製造するための技術 Download PDFInfo
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- 239000000835 fiber Substances 0.000 title claims description 113
- 238000001069 Raman spectroscopy Methods 0.000 title claims description 42
- 238000000034 method Methods 0.000 title claims description 14
- 238000004519 manufacturing process Methods 0.000 title claims description 5
- 238000005452 bending Methods 0.000 claims description 26
- 238000005253 cladding Methods 0.000 claims description 24
- 239000006185 dispersion Substances 0.000 claims description 19
- 239000013307 optical fiber Substances 0.000 claims description 18
- 230000008859 change Effects 0.000 claims description 7
- 230000003287 optical effect Effects 0.000 claims description 6
- 238000009826 distribution Methods 0.000 claims description 3
- 238000013461 design Methods 0.000 description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 230000002547 anomalous effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 229910052691 Erbium Inorganic materials 0.000 description 2
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 description 2
- 238000007429 general method Methods 0.000 description 2
- -1 rare earth ions Chemical class 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 239000000377 silicon dioxide Substances 0.000 description 2
- 229910052779 Neodymium Inorganic materials 0.000 description 1
- 229910052769 Ytterbium Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- QEFYFXOXNSNQGX-UHFFFAOYSA-N neodymium atom Chemical compound [Nd] QEFYFXOXNSNQGX-UHFFFAOYSA-N 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 101150043651 tfb1 gene Proteins 0.000 description 1
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 description 1
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Description
(a)超連続体の生成を回避するための、その動作範囲にわたる正常分散(すなわち、負分散)、
(b)目標波長における小さな有効面積、すなわち、所望のパワー・レベルにおいて波長動作範囲にわたって複数のストークス・シフトを可能にするのに十分に小さい有効面積、
(c)100メートル以上の長さのファイバにおいて容認されうる低損失、および
(d)目標波長より長い波長における有限のLP01モード・カットオフ
の属性を含むようにフィルタ・ファイバを構築することによって達成され、それにより、LP01カットオフ波長は、選択された曲げ直径に対して、目標波長におけるマクロな曲げ損失と目標波長より長い波長におけるマクロな曲げ損失との間に差違をもたらす。
外部半径r1および屈折率n1を有するコア101と、
コア101を取り囲み、外部半径r2および屈折率n2を有する内側クラッド103と、
内側クラッド103を取り囲み、外部半径r0および屈折率n0を有する外側クラッド105と
を生成するように化学的にドープされた、シリカ(SiO2)または他の適切な材料から作製された光導波路を備える。
外側クラッド105に対して、Δn0=n0−n0=0、
コア101に対して、Δn1=n1−n0、
内側クラッド103に対して、Δn2=n2−n0
を有する。
(a)コア半径r1(μm)、
(b)コア屈折率差Δn1、
(c)溝半径r2(μm)
(d)溝の屈折率差Δn2、
(e)LP01カットオフ波長(nm)、
(f)1480nmにおける分散(ps/nm/km)、
(g)1480nmにおける有効面積Aeff(μm2)
を説明する。
箱201:波長動作範囲にわたって、複数のストークス・シフトをサポートする有効面積と、波長動作範囲内での目標波長における負分散の値とをファイバにもたらすように構築された屈折率変化を有する光導波路を設ける
箱202:目標波長より長い波長における有限のLP01カットオフをファイバにもたらすようにファイバを構築し、それにより、LP01カットオフ波長が、選択された曲げ直径に対して、目標波長におけるマクロな曲げ損失と、目標波長より長い波長におけるマクロな曲げ損失との間に、差違をもたらす
箱203:それにより、ラマン散乱が、目標波長より長い波長において防止される。
Claims (12)
- 光ファイバであって、
波長動作範囲にわたって、複数のストークス・シフトをサポートする有効面積と、前記波長動作範囲内での目標波長における負分散の値とを前記ファイバに提供するように構築された屈折率変化を有する光導波路を備え、
前記屈折率変化が、前記目標波長より長い波長における有限のLP01カットオフを前記ファイバに提供するようにさらに構築され、それにより、前記LP01カットオフ波長が、選択された曲げ直径に対して、前記目標波長におけるより小さいマクロな曲げ損失と前記目標波長より長い波長におけるより大きいマクロな曲げ損失との間に、マクロな曲げ損失の差違を引き起こし、
それにより、ラマン散乱が、前記目標波長より長い波長において防止される、光ファイバ。 - 前記選択された曲げ直径に対して、前記目標波長における前記マクロな曲げ損失が0.01dB/km未満であり、前記目標波長を超える1のストークス・シフトにおける前記マクロな曲げ損失が300dB/kmより大きい、請求項1に記載の光ファイバ。
- 前記選択された曲げ直径が、前記フィルタ・ファイバが巻き付けられるファイバ・スプールの曲げ直径に相当する、請求項2に記載の光ファイバ。
- 前記光導波路が、コアと、前記コアを取り囲む内側クラッドと、前記内側クラッドを取り囲む外側クラッドとを含む複数の同心領域を含み、前記ファイバの領域のそれぞれが、外部半径と屈折率差とを有し、
前記屈折率の分布が、前記ファイバ・コアに対応する中央突起および前記内側クラッドに対応する溝を有し、前記中央突起が正の屈折率差を有し、前記溝が負の屈折率差を有し、
前記外側クラッドが、外部半径r0、屈折率n0および屈折率差Δn=0を有し、
前記コアが、外部半径r1、屈折率n1および屈折率差Δn1=n1−n0を有し、
前記内側クラッドが、外部半径r2、屈折率n2および屈折率差Δn2=n2−n0を有する、請求項1に記載の光ファイバ。 - 前記目標波長が1480nmであり、前記光ファイバが、1590nmにおける第1のストークス・シフトおよび1590nmにおけるLP01カットオフ波長を有し、
±10%、
r1=2.0μm
Δn1=0.01308
r2=12μm
Δn2=−0.008
である、請求項4に記載の光ファイバ。 - 前記目標波長が1480nmであり、前記光ファイバが、1590nmにおける第1のストークス・シフトおよび1590nmにおけるLP01カットオフ波長を有し、
±10%、
r1=2.5μm
Δn1=0.00917
r2=6μm
Δn2=−0.008
である、請求項4に記載の光ファイバ。 - 前記目標波長が1480nmであり、前記光ファイバが、1590nmにおける第1のストークス・シフトおよび1590nmにおけるLP01カットオフ波長を有し、
±10%、
r1=2.0μm
Δn1=0.01098
r2=12μm
Δn2=−0.004
である、請求項4に記載の光ファイバ。 - 前記目標波長が1480nmであり、前記光ファイバが、1590nmにおける第1のストークス・シフトおよび1590nmにおけるLP01カットオフ波長を有し、
±10%、
r1=1.8μm
Δn1=0.01529
r2=8μm
Δn2=−0.008
である、請求項4に記載の光ファイバ。 - フィルタ・ファイバを製造する方法であって、
波長動作範囲にわたって、複数のストークス・シフトをサポートする有効面積と、前記波長動作範囲内での目標波長における負分散の値とを前記ファイバに提供するように構築された屈折率変化を有する光導波路を設け、
前記目標波長より長い波長における有限のLP01カットオフを前記ファイバに提供する屈折率変化を有するように前記ファイバを構築することを含み、それにより、前記LP01カットオフ波長が、選択された曲げ直径に対して、前記目標波長におけるより小さいマクロな曲げ損失と前記目標波長より長い波長におけるより大きいマクロな曲げ損失との間に、マクロな曲げ損失の差違を引き起こし、
それにより、ラマン散乱が、前記目標波長より長い波長において防止される、方法。 - 前記選択された曲げ直径が、前記フィルタ・ファイバが巻き付けられるファイバ・スプールの曲げ直径に相当する、請求項9に記載の方法。
- 前記LP 01 カットオフ波長は、前記目標波長を超えて1/2から1ストークス・シフトである、請求項1に記載の光ファイバ。
- 前記LP 01 カットオフ波長は、前記目標波長を超えて1/2から1ストークス・シフトである、請求項9に記載の方法。
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