JP4851371B2 - 光ファイバおよび光ファイバ伝送路 - Google Patents
光ファイバおよび光ファイバ伝送路 Download PDFInfo
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- JP4851371B2 JP4851371B2 JP2007062100A JP2007062100A JP4851371B2 JP 4851371 B2 JP4851371 B2 JP 4851371B2 JP 2007062100 A JP2007062100 A JP 2007062100A JP 2007062100 A JP2007062100 A JP 2007062100A JP 4851371 B2 JP4851371 B2 JP 4851371B2
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- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03638—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only
- G02B6/03644—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only arranged - + -
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
- G02B6/02219—Characterised by the wavelength dispersion properties in the silica low loss window around 1550 nm, i.e. S, C, L and U bands from 1460-1675 nm
- G02B6/02228—Dispersion flattened fibres, i.e. having a low dispersion variation over an extended wavelength range
- G02B6/02238—Low dispersion slope fibres
- G02B6/02242—Low dispersion slope fibres having a dispersion slope <0.06 ps/km/nm2
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
- G02B6/02219—Characterised by the wavelength dispersion properties in the silica low loss window around 1550 nm, i.e. S, C, L and U bands from 1460-1675 nm
- G02B6/02266—Positive dispersion fibres at 1550 nm
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
- G02B6/0288—Multimode fibre, e.g. graded index core for compensating modal dispersion
-
- 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
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29371—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating principle based on material dispersion
- G02B6/29374—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating principle based on material dispersion in an optical light guide
- G02B6/29376—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating principle based on material dispersion in an optical light guide coupling light guides for controlling wavelength dispersion, e.g. by concatenation of two light guides having different dispersion properties
- G02B6/29377—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating principle based on material dispersion in an optical light guide coupling light guides for controlling wavelength dispersion, e.g. by concatenation of two light guides having different dispersion properties controlling dispersion around 1550 nm, i.e. S, C, L and U bands from 1460-1675 nm
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02004—Optical fibres with cladding with or without a coating characterised by the core effective area or mode field radius
- G02B6/02009—Large effective area or mode field radius, e.g. to reduce nonlinear effects in single mode fibres
- G02B6/02014—Effective area greater than 60 square microns in the C band, i.e. 1530-1565 nm
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
- G02B6/02219—Characterised by the wavelength dispersion properties in the silica low loss window around 1550 nm, i.e. S, C, L and U bands from 1460-1675 nm
- G02B6/02252—Negative dispersion fibres at 1550 nm
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
- G02B6/02219—Characterised by the wavelength dispersion properties in the silica low loss window around 1550 nm, i.e. S, C, L and U bands from 1460-1675 nm
- G02B6/02266—Positive dispersion fibres at 1550 nm
- G02B6/02271—Non-zero dispersion shifted fibres, i.e. having a small positive dispersion at 1550 nm, e.g. ITU-T G.655 dispersion between 1.0 to 10 ps/nm.km for avoiding nonlinear effects
-
- 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
- G02B6/0281—Graded index region forming part of the central core segment, e.g. alpha profile, triangular, trapezoidal core
Description
本実施の形態1に係る光ファイバは、Cバンドである1530〜1565nmの波長帯域のWDM信号光を基底伝搬モードで伝送する光ファイバであって、1550nm以上のカットオフ波長を有し、波長1550nmにおける基底伝搬モードの波長分散値が0ps/nm/kmより大きく、分散スロープ値が−0.05ps/nm2/km以下である。
n2(r)=ncore 2×{1−2×(Δ/100)×(r/a)^α1}
(但し、0<r<a) (1)
ただし、rは中心コア部の中心からの半径方向の位置を示し、n(r)は位置rにおける屈折率、ncoreは中心コア部のr=0における屈折率、aは中心コア部の半径を表している。また、記号「^」はべき乗を表す記号である。
つぎに、本発明の実施の形態2に係る光ファイバ伝送路について説明する。図17は、本実施の形態2に係る光ファイバ伝送路を模式的に表した概略図である。この光ファイバ伝送路100は、nを1以上の整数として、大Aeff型のノンゼロ分散シフト光ファイバ21−1〜21−nと低スロープ型のノンゼロ分散シフト光ファイバ22−1〜22−nとを交互に接続した複合ノンゼロ分散シフト光ファイバ20と、実施の形態1に係る光ファイバ10と、複合ノンゼロ分散シフト光ファイバ20と光ファイバ10との間に介挿された光増幅器30とを備え、複合ノンゼロ分散シフト光ファイバ20側からCバンドのWDM信号光を伝送するものである。
2 内側コア層
3 外側コア層
4 クラッド層
5 屈折率プロファイル
10 光ファイバ
20 複合ノンゼロ分散シフト光ファイバ
21−1〜21−n、22−1〜22−n ノンゼロ分散シフト光ファイバ
30 光増幅器
100 光ファイバ伝送路
Claims (6)
- 波長1550mの信号光を基底伝搬モードで伝送する光ファイバであって、
中心コア部と、
前記中心コア部の外周に形成され前記中心コア部よりも屈折率が低い内側コア層と、
前記内側コア層の外周に形成され前記中心コア部よりも屈折率が低くかつ前記内側コア層よりも屈折率が高い外側コア層と、
前記外側コア層の周囲に形成され前記内側コア層よりも屈折率が高くかつ前記外側コア層よりも屈折率が低いクラッド層と、
を有し、前記中心コア部の前記クラッド層に対する比屈折率差Δ1が0.3%以上、0.75%以下であり、前記内側コア層の前記クラッド層に対する比屈折率差Δ2が−0.7%以上、0%未満であり、前記外側コア層の前記クラッド層に対する比屈折率差Δ3が0.2%〜0.3%であり、前記中心コア部の直径に対する前記内側コア層の外径の比b/aが1.5以上、2.9以下であり、前記中心コア部の直径に対する前記外側コア層の外径の比c/aが2.8以上、4.8以下であり、前記中心コア部の直径2aが6.4μm以上、12.07μm以下であり、
前記信号光の波長以上のカットオフ波長を有し、
前記信号光の波長における基底伝搬モードの波長分散値が0ps/nm/kmより大きく、15.4ps/nm/km以下であり、分散スロープ値が−0.397ps/nm2/km以上、−0.05ps/nm2/km以下であることを特徴とする光ファイバ。 - 直径20mmで16周巻いた場合の前記信号光の波長における基底伝搬モードの曲げ損失が20dB/m以下であることを特徴とする請求項1に記載の光ファイバ。
- 前記信号光の波長における基底伝搬モードの波長分散値が8ps/nm/km以上であり、波長分散値を分散スロープ値で除算したDPS値が−100nm以上、−18nm以下であり、有効コア断面積が40μm2以上、90.6μm2以下であることを特徴とする請求項1または2に記載の光ファイバ。
- 請求項1〜3のいずれか1つに記載の光ファイバと、前記光ファイバに接続し、前記信号光の波長よりも短いカットオフ波長を有するとともに前記信号光の波長において−5ps/nm/km以上0ps/nm/kmより小さい波長分散値と0ps/nm2/kmより大きく0.25ps/nm2/km以下の分散スロープ値とを有するシングルモード光ファイバとを備え、前記シングルモード光ファイバ側から前記信号光を伝送することを特徴とする光ファイバ伝送路。
- 前記シングルモード光ファイバは、前記信号光の波長において−1ps/nm/km以下の波長分散値を有することを特徴とする請求項4に記載の光ファイバ伝送路。
- 前記シングルモード光ファイバは、前記信号光波長において、−50〜−20nmのDPS値を有することを特徴とする請求項4または5に記載の光ファイバ伝送路。
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007062100A JP4851371B2 (ja) | 2007-03-12 | 2007-03-12 | 光ファイバおよび光ファイバ伝送路 |
US12/041,230 US7773845B2 (en) | 2007-03-12 | 2008-03-03 | Optical fiber and optical-fiber transmission line |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007062100A JP4851371B2 (ja) | 2007-03-12 | 2007-03-12 | 光ファイバおよび光ファイバ伝送路 |
Publications (2)
Publication Number | Publication Date |
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JP2008224969A JP2008224969A (ja) | 2008-09-25 |
JP4851371B2 true JP4851371B2 (ja) | 2012-01-11 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP2007062100A Expired - Fee Related JP4851371B2 (ja) | 2007-03-12 | 2007-03-12 | 光ファイバおよび光ファイバ伝送路 |
Country Status (2)
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US (1) | US7773845B2 (ja) |
JP (1) | JP4851371B2 (ja) |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4851371B2 (ja) | 2007-03-12 | 2012-01-11 | 古河電気工業株式会社 | 光ファイバおよび光ファイバ伝送路 |
JP5170909B2 (ja) | 2008-02-27 | 2013-03-27 | 古河電気工業株式会社 | 光伝送システムおよびマルチコア光ファイバ |
US8768131B2 (en) * | 2008-08-13 | 2014-07-01 | Corning Incorporated | Multimode fiber with at least dual cladding |
JP5415728B2 (ja) * | 2008-08-29 | 2014-02-12 | 古河電気工業株式会社 | マルチコアホーリーファイバおよび光伝送システム |
CN102257415B (zh) * | 2008-12-24 | 2013-10-16 | 古河电气工业株式会社 | 多芯光纤 |
JP5224371B2 (ja) * | 2008-12-25 | 2013-07-03 | 古河電気工業株式会社 | マルチコア光ファイバ |
US9075183B2 (en) * | 2009-08-17 | 2015-07-07 | Ofs Fitel, Llc | Optical fibers with truncated cores |
US8385703B2 (en) * | 2010-03-02 | 2013-02-26 | Corning Incorporated | High numerical aperture multimode optical fiber |
US8737793B2 (en) | 2010-03-16 | 2014-05-27 | Furukawa Electric Co., Ltd. | Multi-core optical fiber and method of manufacturing the same |
US9678269B2 (en) | 2014-05-16 | 2017-06-13 | Corning Incorporated | Multimode optical fiber transmission system including single mode fiber |
US20150331181A1 (en) * | 2014-05-16 | 2015-11-19 | Corning Incorporated | Multimode optical fiber and system including such |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH0923187A (ja) * | 1995-07-10 | 1997-01-21 | Fujitsu Ltd | 光伝送システム |
JPH09318833A (ja) * | 1996-03-28 | 1997-12-12 | Furukawa Electric Co Ltd:The | 分散シフト光ファイバおよびその光ファイバを用いた波長多重光伝送システム |
JP2005196231A (ja) * | 1996-04-15 | 2005-07-21 | Sumitomo Electric Ind Ltd | 光伝送システム |
US6526209B1 (en) * | 2000-04-17 | 2003-02-25 | Sumitomo Electric Industries, Ltd. | Optical fiber having improved optics and structure |
FR2839221B1 (fr) * | 2002-04-29 | 2006-01-27 | Cit Alcatel | Fibre de compensation de la dispersion chromatique cumulee dans une fibre a dispersion chromatique negative |
JP4346328B2 (ja) | 2003-03-07 | 2009-10-21 | 古河電気工業株式会社 | 光伝送路 |
JP4481014B2 (ja) * | 2004-01-06 | 2010-06-16 | 株式会社フジクラ | 光ファイバ伝送路 |
JP4851371B2 (ja) | 2007-03-12 | 2012-01-11 | 古河電気工業株式会社 | 光ファイバおよび光ファイバ伝送路 |
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2007
- 2007-03-12 JP JP2007062100A patent/JP4851371B2/ja not_active Expired - Fee Related
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2008
- 2008-03-03 US US12/041,230 patent/US7773845B2/en not_active Expired - Fee Related
Also Published As
Publication number | Publication date |
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JP2008224969A (ja) | 2008-09-25 |
US20080310807A1 (en) | 2008-12-18 |
US7773845B2 (en) | 2010-08-10 |
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