JP5268358B2 - 低損失有効断面積拡大型光ファイバ - Google Patents
低損失有効断面積拡大型光ファイバ 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
- G02B6/02004—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
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
-
- 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
- G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
-
- 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
- G02B6/02004—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
-
- 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
ここで積分範囲は0から無限大(∞)までであり、fは波長内で伝搬する光に付随する電界の横方向成分である。本明細書で「有効断面積」は「Aeff」と表され、特に断りがない限り、1550nmの波長での光学的有効(実効)面積を意味する。
ここで、r0はΔ(r)が最大値となる点であり、r1はΔ(r)%がゼロになる点であり、rはri <r</rfであり、Δは上記したとおりのものであり、riはα分布の初期点(始点)であり、rfはα分布の最終点であり、αは累乗の指数(実数)である。
表1及び表2は第1好適実施例グループの例1−例6の特性を示している。図1は例1−例6に対応する屈折率分布を曲線1で示している。
表3及び表4は第2好適実施例グループの例7及び例8の特性を示している。図2は例7及び例8に対応する屈折率分布を曲線2A及び2Bで示している。
第3好適実施例グループは表5及び表6の例9により示されており、図3においてその屈折率分布は曲線4により描かれている。第4好適実施例グループは表5及び表6の例10により示されており、図3においてその屈折率分布は曲線5により描かれている。
第3実施例グループでは、ラムダゼロ(ゼロ分散波長)が1350nm未満(好ましくは1290−1350nm、より好ましくは1290−1330nm)である。1310nmにおける分散は−5ps/nm-kmから5ps/nm‐kmの間(好ましくは−3ps/nm-kmから3ps/nm-kmの間、幾つかの好適実施例では−2ps/nm-kmから2ps/nm-kmの間)である。1310nmにおける分散スロープは0.10ps/nm2-km未満(好ましくは0.095ps/nm2-km未満)である。1310nmにおける光学有効断面積は60μm2(好ましくは65μm2)より大きい。1310nmにおけるMFDは9μmより大きく、幾つかの好適実施例では9μmから11μmの間である。1310nmにおける損失(減衰)は0.35dB/km未満(好ましくは0.34dB/km未満)である。1550nmにおける分散は15ps/nm-kmより大きく(好ましくは15−21ps/nm-km、より好ましくは16−20ps/nm-km)である。1550nmにおける分散スロープは0.07ps/nm2-km未満であり、幾つかの好適実施例では0.060−0.070ps/nm2-kmである。1550nmにおける光学的有効断面積は75μm2(好ましくは80μm2)より大きく、幾つかの好適実施例では85−95μm2である。1550nmにおけるMFDは10μmより大きく、幾つかの好適実施例では10−11μmである。1550nmにおける損失は0.20dB/km(好ましくは0.19dB/km)未満である。幾つかの実施例では、ケーブルカットオフ周波数は1500nm未満であり、他の実施例では1300−1500nmである。好ましくは1550nmにおけるピンアレイ損失は25dB未満(より好ましくは20dB未満、さらに好ましくは15dB未満、さらに好ましくは10dB未満)であり、幾つかの好適実施例では5dB未満である。好ましくは1550nmにおけるラテラル荷重損失は2dB/m未満(より好ましくは1dB/m未満)である。好ましくはファイバカットオフ波長は1650nm未満であり、より好ましくは1550nm未満である。
Claims (11)
- 光導波路ファイバであって、
中心線から半径R1まで半径方向外方に延びて、正の相対屈折率%(Δ1(r)%)を有し、最大相対屈折率%(Δ1MAX)が0.3%より大きい中央セグメントと、
中心コア領域を囲み、半径R3まで延びて、負の相対屈折率%(Δ3(r)%)を有し、最小相対屈折率%(Δ3MIN)を有する環状セグメントと、
前記中央セグメントと前記環状セグメントの間に設けられ、前記中央セグメントを囲んで且つ前記中央セグメントに直接接触する中間環状セグメントと、
環状領域を囲み、前記環状領域に直接接触し、相対屈折率%(ΔC(r)%)を有する外側環状クラッドとからなり、
前記環状セグメントの幅W3は3μmから7μmの間であり、前記中間環状セグメントの外径R2は8μmから10μmの間であり、前記相対屈折率%は前記外側環状クラッドの屈折率を基準とした値であり、
Δ1MAX>0>Δ3MINであり、
波長約1550nmにおいて有効断面積が75μm2より大きくなり、波長約1550nmにおいて分散スロープが0.07ps/nm2/km未満となり、ゼロ分散波長が1290nmから1330nmの間にあり、波長約1550nmにおいて損失が0.20dB/km未満となるように、光ファイバの相対屈折率が選択されることを特徴とする光導波路ファイバ。 - 前記中間環状セグメントの相対屈折率分布Δ2(r)の最大絶対値が0.05%未満である請求項1記載の光ファイバ。
- 前記中間環状セグメントの中間点R2MIDは7μmから9μmの間である請求項2記載の光ファイバ。
- 前記中央セグメントの最外径R 1 は6μmから8μmの間である請求項2記載の光ファイバ。
- 前記中間環状セグメントの最大相対屈折率Δ 2MAX は|Δ 2MAX |<0.05%である請求項1記載の光ファイバ。
- 光導波路ファイバであって、
中心線から半径R 1 まで半径方向外方に延び、正の相対屈折率%(Δ 1 (r)%)を有し、最大相対屈折率%(Δ 1MAX )が0.3%より大きい中央セグメントであって、Δ 1 (r)がα分布を有し、α1が3未満である中央セグメントと、
中央コア領域を囲み、半径R 3 まで延び、負の相対屈折率%(Δ 3 (r)%)を有し、最小相対屈折率(Δ 3MIN )を有する環状セグメントと、
前記中央セグメントと前記環状セグメントの間に設けられ、前記中央セグメントを囲み、前記中央セグメントに直接接触する中間環状セグメントと、
環状領域を囲み、前記環状領域に直接接触し、相対屈折率%(Δ C (r)%)を有する外側環状クラッドとからなり、
前記環状セグメントの幅W 3 は3μmから7μmの間であり、前記中間環状セグメントの外径R 2 は8μmから10μmの間であり、ゼロ分散波長が1290nmから1330nmの間にあり、前記相対屈折率%は前記外側環状クラッドの屈折率を基準とした値であり、
波長1550nmにおいて分散が16ps/nm/kmから20ps/nm/kmの間となり且つ波長1550nmにおいて損失が0.20dB/km未満となるように光ファイバの相対屈折率が選択され、
Δ 1MAX >0>Δ 3MIN であることを特徴とする光導波路ファイバ。 - 前記中間環状セグメントの相対屈折率分布Δ 2 (r)の最大絶対値は0.05%未満である請求項6記載の光ファイバ。
- Δ 3MIN が−0.1%未満である請求項6記載の光ファイバ。
- α1が2未満である請求項6記載の光ファイバ。
- α1が1から2の間である請求項6記載の光ファイバ。
- Δ 1MAX が0.4%から0.5%の間である請求項6記載の光ファイバ。
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Application Number | Priority Date | Filing Date | Title |
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US10/835,874 US7187833B2 (en) | 2004-04-29 | 2004-04-29 | Low attenuation large effective area optical fiber |
US10/835,874 | 2004-04-29 | ||
PCT/US2005/012905 WO2005111683A1 (en) | 2004-04-29 | 2005-04-13 | Low attenuation large effective area optical fiber |
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JP2007535003A JP2007535003A (ja) | 2007-11-29 |
JP5268358B2 true JP5268358B2 (ja) | 2013-08-21 |
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US (2) | US7187833B2 (ja) |
EP (1) | EP1740986B1 (ja) |
JP (1) | JP5268358B2 (ja) |
KR (1) | KR20070012841A (ja) |
CN (1) | CN100470274C (ja) |
WO (1) | WO2005111683A1 (ja) |
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WO2005111683A1 (en) | 2005-11-24 |
KR20070012841A (ko) | 2007-01-29 |
CN1973222A (zh) | 2007-05-30 |
EP1740986B1 (en) | 2016-12-21 |
US20050244120A1 (en) | 2005-11-03 |
EP1740986A1 (en) | 2007-01-10 |
US7254305B2 (en) | 2007-08-07 |
CN100470274C (zh) | 2009-03-18 |
JP2007535003A (ja) | 2007-11-29 |
US20070053642A1 (en) | 2007-03-08 |
US7187833B2 (en) | 2007-03-06 |
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