JP2004341525A - 特大有効コア断面積(sla)光ファイバ、およびそれを組み込んだ通信システム - Google Patents
特大有効コア断面積(sla)光ファイバ、およびそれを組み込んだ通信システム Download PDFInfo
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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
- G02B6/03661—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 4 layers only
- G02B6/03666—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 4 layers only arranged - + - +
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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
- G02B6/02004—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
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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
- G02B6/02004—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
- G02B6/02019—Effective area greater than 90 square microns in the C band, i.e. 1530-1565 nm
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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
- G02B6/028—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
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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
- G02B6/03605—Highest refractive index not on central axis
- G02B6/03611—Highest index adjacent to central axis region, e.g. annular core, coaxial ring, centreline depression affecting waveguiding
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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
- G02B6/03622—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 2 layers only
- G02B6/03627—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 2 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
- G02B6/036—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
- G02B6/0365—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
- G02B6/02266—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
- G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
- G02B6/0228—Characterised by the wavelength dispersion slope properties around 1550 nm
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Abstract
【解決手段】 比屈折率の最大値がコアの中心から半径方向にずれたところに生じるようにコア領域を分割することにより、有効コア断面積が1310nm近くの波長窓において好ましくは約80μm2に等しいか、それよりも大きい特大有効コア断面積とし、かつ非常に小さいカット・オフ波長を持たせることにより、マクロ・ベンディングロスの増加や、減衰を引き起こすことのない優れた伝送特性を得る。
【選択図】 図2
Description
0≦a1≦2.65、7.1≦a1+a2≦10、および3≦a3≦25であって、ここで全ての値はマイクロメータ(μm)の単位である。好ましくは、
0.25%≦nmax≦0.42%である。
Aeff(1310nm)≧80μm2;
2)ケーブル・カット・オフ波長≦1310nm;
3)マクロ・ベンディングロス:直径20mmマンドレルの場合で10dB/mより小さい;
4)減衰損失:1550nmで0.19dB/kmより小さい;
1310nmで0.35dB/kmより小さい;
5)分散(D):1550nmにおいてD〜20ps/km/nm;
6)分散と分散スロープの比(RDS):1550nmにおいて
RDS〜0.0031nm−1
1)有効コア断面積Aeff(1550nm)≒113.9μm2;
Aeff(1310nm)≒100.3μm2;
2)ケーブル・カット・オフ波長≦1300nm;
3)マクロ・ベンディングロス:直径20mmマンドレルの場合で10dB/mより小さい;
4)D(1550nm):20.55ps/km/nm;
5)分散スロープ(S)(1550nm):0.064ps/km/nm2
6)減衰損失:1550nmで0.19dB/kmより小さい;
1310nmで0.35dB/kmより小さい;
1)有効コア断面積Aeff(1550nm)≒107.3μm2;
Aeff(1310nm)≒93.7μm2;
2)ケーブル・カット・オフ波長≦1300nm;
3)マクロ・ベンティングロス:直径20mmマンドレルの場合で10dB/mより小さい;
4)D(1550nm):20.49ps/km/nm;
5)S(1550nm):0.064ps/km/nm2
6)減衰損失:1550nmで0.19dB/kmより小さい;
1310nmで0.35dB/kmより小さい;
1)有効コア断面積Aeff(1550nm)≒122.9μm2;
Aeff(1310nm)≒102.1μm2;
2)ケーブル・カット・オフ波長≦1320nm;
3)マクロ・ベンディングロス:直径20mmマンドレルの場合で10dB/mより小さい;
4)D(1550nm):19.60ps/km/nm;
5)S(1550nm):0.063ps/km/nm2
6)減衰損失:1550nmで0.19dB/kmより小さい;
1310nmで0.35dB/kmより小さい;
1)有効コア断面積Aeff(1550nm)≒131.2μm2;
Aeff(1310nm)≒112.4μm2;
2)ケーブル・カット・オフ波長≦1340nm;
3)マクロ・ベンディングロス:直径20mmマンドレルの場合で10dB/mより小さい;
4)D(1550nm):20.08ps/km/nm;
5)S(1550nm):0.064ps/km/nm2
6)減衰損失:1550nmで0.19dB/kmより小さい;
1310nmで0.35dB/kmより小さい;
1)有効コア断面積Aeff(1550nm)≒106.4μm2;
Aeff(1310nm)≒92.5μm2;
2)ケーブル・カット・オフ波長≦1300nm;
3)マクロ・ベンディングロス:直径20mmマンドレルの場合で10dB/mより小さい;
4)D(1550nm):20.64ps/km/nm;
5)S(1550nm):0.063ps/km/nm2
6)減衰損失:1550nmで0.19dB/kmより小さい;
1310nmで0.35dB/kmより小さい;
11 コア領域
12A 第1のコア領域
12B 第2のコア領域
13 第1の環状領域
14 外側クラッド
21 最大比屈折率
22 比屈折率の増加線
23 比屈折率の減少線
24 溝領域
25 外側クラッド部
53 コアの中心軸上にある最大比屈折率
63 コアの中心軸上からずれた最大比屈折率
74 溝領域
77 第2領域
81 分割されないコア領域
82 第1溝領域
83 第2溝領域
Claims (10)
- 少なくとも1つの光エネルギー発生源と、正の分散と正の分散スロープを有する光ファイバ(10)を含む光ファイバケーブルを含み、前記光ファイバケーブルが前記少なくとも1つの光エネルギー発生源と結合され、かつ前記光ファイバ(10)がコア領域(11)とコア領域を取り囲むクラッド領域(14)からなり、さらに前記光ファイバがおおよそ1310nmの波長においておおよそ80μm2に等しいか、あるいはそれより大きい有効コア断面積、Aeff、を有し、かつ、おおよそ1310nmよりも小さいか、あるいは等しいケーブル・カット・オフ波長を有し、コア領域(11)が少なくとも第1(12A)と第2の屈折率部分(12B)とに分割され、前記第1と第2の屈折率部分(12A、12B)がそれぞれ互いに異なる正の第1および第2の屈折率n1a、およびn1bとを有することを特徴とする光ファイバ通信システム。
- 光ファイバ(10)がおおよそ1550nmの波長においておおよそ95μm2に等しいか、あるいはそれより大きい有効コア断面積、Aeff、を有することを特徴とする請求項1に記載の光ファイバ通信システム。
- 光ファイバ(10)がさらにコア領域(11)とクラッド領域(14)との間に溝領域(13)を有し、前記溝領域(13)が負の比屈折率n2を有することを特徴とする請求項1に記載の光ファイバ通信システム。
- コア領域(11)が、rはミクロンで表わした半径方向の位置であり、nmaxはコア領域の最大比屈折率であり、a1はコア領域の第1の部分の半径であり、a2はコア領域(11)の第2の部分の厚みであり、n1aは分割されたコア領域(11)の第1の部分(12A)の比屈折率であり、n1bは分割されたコア領域(11)の第2の部分(12B)の比屈折率であり、a1+a2はコア領域の半径rであり、a3は溝領域の幅であり、a1+a2+a3はクラッド領域の始点に接する溝領域(13)の外側端までの半径であるとした場合に、次の式(1)、および(2)で定義される比屈折率プロファイルを有する第1と第2の屈折率部分(12A、および12B)を有することを特徴とする請求項3に記載の光ファイバ通信システム。
- α1≧1がコア領域(11)の屈折率プロファイルの形を記述する指数部であることを特長とする請求項4に記載の光ファイバ通信システム。
- a1、a2、およびa3の単位がマイクロメータ(μm)であって、
0≦a1≦2.65、7.1≦a1+a2≦10、および3≦a3≦25であることを特長とする請求項4に記載の光ファイバ通信システム。 - 特大有効コア断面積(SLA)光ファイバ(10)が正の分散と正の分散スロープを有し、かつ、おおよそ1310nmの波長においておおよそ80μm2に等しいか、あるいはそれより大きい有効コア断面積、Aeff、を有し、かつ、おおよそ1310nmよりも小さいか、あるいは等しいケーブル・カット・オフ波長を有し、かつ、光ファイバ(10)がコア領域(11)とコア領域(11)を取り囲むクラッド領域(14)を有し、かつ、コア領域(11)が少なくとも第1と第2の屈折率部分(12A、12B)とに分割され、かつ、第1と第2の屈折率部分(12A、12B)が第1と第2の屈折率がそれぞれ互いに異なるn1a、およびn1bを有し、かつ、第1と第2の比屈折率が正であることを特徴とする特大有効コア断面積(SLA)光ファイバ(10)。
- 光ファイバ(10)がおおよそ1550nmの波長においておおよそ95μm2に等しいか、あるいはそれより大きい有効コア断面積、Aeff、を有することを特徴とする請求項7に記載の光ファイバ(10)。
- 光ファイバ(10)がさらにコア領域(11)とクラッド領域(14)との間に溝領域(13)を有し、前記溝領域(13)が負の比屈折率n2を有することを特徴とする請求項8に記載の光ファイバ(10)。
- コア領域(11)が、rはミクロンで表わした半径方向の位置であり、nmaxはコア領域(11)の最大比屈折率であり、a1はコア領域(11)の第1の部分の半径であり、a2はコア領域の第2の部分(12B)の厚みであり、n1aは分割されたコア領域(11)の第1の部分(12A)の比屈折率であり、n1bは分割されたコア領域(11)の第2の部分(12B)の比屈折率であり、a1+a2はコア領域(11)の半径rであり、a3は溝領域(13)の幅であり、a1+a2+a3はクラッド領域(14)の始点に接する溝領域(13)の外側端までの半径であるとした場合に、次の式(1)、および(2)で定義される比屈折率プロファイルを有する第1と第2の屈折率部分(12A、および12B)を有することを特徴とする請求項9に記載の光ファイバ(10)。
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US10/435,855 US6904218B2 (en) | 2003-05-12 | 2003-05-12 | Super-large-effective-area (SLA) optical fiber and communication system incorporating the same |
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EP (1) | EP1477831B1 (ja) |
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CN (1) | CN1278150C (ja) |
DE (1) | DE602004000279T2 (ja) |
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2004
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- 2004-01-29 DE DE602004000279T patent/DE602004000279T2/de not_active Expired - Lifetime
- 2004-03-17 CN CN200410030019.7A patent/CN1278150C/zh not_active Expired - Lifetime
- 2004-05-12 JP JP2004141746A patent/JP4163656B2/ja not_active Expired - Lifetime
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JP2008225454A (ja) * | 2007-02-13 | 2008-09-25 | Olympus Corp | レーザ顕微鏡 |
JP2014222354A (ja) * | 2007-05-07 | 2014-11-27 | コーニング インコーポレイテッド | 拡大実効面積ファイバ |
JP2010176123A (ja) * | 2009-01-27 | 2010-08-12 | Draka Comteq Bv | 実効面積が増大した単一モード光ファイバ |
JP2011039109A (ja) * | 2009-08-06 | 2011-02-24 | Sumitomo Electric Ind Ltd | 光通信システム |
US8346041B2 (en) | 2009-08-06 | 2013-01-01 | Sumitomo Electric Industries, Ltd. | Optical communications system |
JP2014523546A (ja) * | 2011-06-30 | 2014-09-11 | オーエフエス ファイテル,エルエルシー | 1550nmの波長範囲における使用のためのファイバストレッチャモジュール |
Also Published As
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CN1278150C (zh) | 2006-10-04 |
US20040228593A1 (en) | 2004-11-18 |
CN1550802A (zh) | 2004-12-01 |
EP1477831A1 (en) | 2004-11-17 |
DE602004000279D1 (de) | 2006-02-02 |
US6904218B2 (en) | 2005-06-07 |
EP1477831B1 (en) | 2005-12-28 |
JP4163656B2 (ja) | 2008-10-08 |
DE602004000279T2 (de) | 2006-07-20 |
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