JP5967892B2 - 曲げ損失の影響を受けないマルチモード光ファイバ - Google Patents
曲げ損失の影響を受けないマルチモード光ファイバ Download PDFInfo
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- JP5967892B2 JP5967892B2 JP2011226494A JP2011226494A JP5967892B2 JP 5967892 B2 JP5967892 B2 JP 5967892B2 JP 2011226494 A JP2011226494 A JP 2011226494A JP 2011226494 A JP2011226494 A JP 2011226494A JP 5967892 B2 JP5967892 B2 JP 5967892B2
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- optical fiber
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Classifications
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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
- G02B6/0288—Multimode fibre, e.g. graded index core for compensating modal dispersion
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/08—Testing mechanical properties
- G01M11/088—Testing mechanical properties of optical fibres; Mechanical features associated with the optical testing of optical fibres
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M11/00—Testing of optical apparatus; Testing structures by optical methods not otherwise provided for
- G01M11/30—Testing of optical devices, constituted by fibre optics or optical waveguides
- G01M11/33—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face
- G01M11/338—Testing of optical devices, constituted by fibre optics or optical waveguides with a light emitter being disposed at one fibre or waveguide end-face, and a light receiver at the other end-face by measuring dispersion other than PMD, e.g. chromatic 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
- G02B6/02—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
Description
α(アルファ)≧1;(屈折率ステップに対応してα→∞);
n1はマルチモードコアの最大屈折率;
r1はマルチモードコアの半径;
および、
各光ファイバに対して存在する、
光ファイバが曲げられない(言い換えれば曲げに受けない)ときの第1のモーダル帯域幅の値BWを測定するステップと、
光ファイバが曲げられる(言い換えれば曲げに受ける)ときの第2のモーダル帯域幅の値bBWを測定するステップと、
前記第2の値bBWが帯域幅の閾値Aを超える光ファイバを選択するステップと
を含み、前記閾値Aが、第1の値BWより大であり、
前記第1のモーダル帯域幅の値BWと、
所定の曲げ損失の値BLと
の関数である、方法を提供する。
光ファイバが曲げられないときの光ファイバに対して分散モード遅延(DMD)測定を実行するステップと、
光ファイバが曲げられないときに対応する係数を使用して、前記DMD測定値を重み付けするステップと
を含み、
前記第2の値bBWを測定するステップが、光ファイバが曲げられるときに対応する係数で前記DMD測定値を重み付けするステップからなる。
Aは、前記帯域幅の閾値であり、
BWは、光ファイバが曲げられないときの光ファイバの第1のモーダル帯域幅の値であり、
BLは、前記所定の曲げ損失の値であり、
Dは、光ファイバが曲げられないときの光ファイバの第1のモーダル帯域幅の値BWの関数である値であり、
αは、定数である。
半径r1を有する中心コアと光クラッドと
を含み、光クラッドが:
中心コアに隣接し、半径r2を有し、数学的にr2−r1で表され、0.8μmから5μmの範囲にある、内側クラッドの半径r2と中心コアの半径r1との間の差を有する内側クラッドと、
内側クラッドに隣接し、かつ半径r3と、下式
を含み、モーダル帯域幅が、光ファイバが受ける曲げに応じて決まる
マルチモード光ファイバであって、
光ファイバが曲げられるときのモーダル帯域幅の値bBWが、帯域幅の閾値Aを超え、前記閾値Aが、第1の値BWを超え、かつ以下の:
光ファイバが曲げられないときのモーダル帯域幅の値BWと、
所定の曲げ損失の値BLと
の関数であることを特徴とする、光ファイバも提供する。
Aは、前記帯域幅の閾値であり、
BWは、光ファイバが曲げられないときの光ファイバのモーダル帯域幅の値であり、
BLは、所定の曲げ損失の値であり、
Dは、光ファイバが曲げられないときの光ファイバのモーダル帯域幅の値BWの関数である値であり、
αは、定数である。
Aは、前記帯域幅の閾値であり、
BWは、光ファイバが曲げられないときの、光ファイバの第1のモーダル帯域幅の値であり、
BLは、前記所定の曲げ損失の値であり、
Dは、光ファイバが曲げられないときの、光ファイバの第1のモーダル帯域幅の値BWの関数である値であり、
αは、定数である。
21 光パルス
22 光ファイバのコアの中心
23 DMDのマップ
24 半径方向オフセット
200 マルチモードファイバ
202 中心コア
204 内側クラッド
206 溝
208 外側クラッド
Claims (9)
- 複数のマルチモード光ファイバから、個別のモーダル帯域幅が、光ファイバが受ける曲げによって決まる1つまたは複数のマルチモード光ファイバを選択する方法であって、各光ファイバに対して、
i)光ファイバが曲げられていないときの光ファイバに対して分散モード遅延(DMD)測定を実行するステップと、
ii)光ファイバが曲げられていないときに対応する係数Cを使用して、ステップi)で得られた前記DMD測定値を重み付けすることによって、光ファイバが曲げられていないときの第1のモーダル帯域幅の値BWを決定するステップ(100)とを含み、各係数Cが入射の半径方向オフセットに対応し、前記方法がさらに、
iii)DMDパワー分布をモデル化することによって、光ファイバが曲げられたときに対応する係数Cbを得るステップを含み、前記DMDパワー分布は、光ファイバが曲げられていないときの光ファイバから得られる前記DMD測定値に基づき、光ファイバが曲げられた場合に各入射の半径方向オフセットについて得られ、前記方法がさらに、
iv)ステップiii)で得られる係数Cbを用いて、ステップi)で得られた前記DMD測定値を重み付けすることによって、光ファイバが曲げられたときの第2のモーダル帯域幅の値bBWを決定するステップ(101)と、
v)ステップiv)で得られる前記第2のモーダル帯域幅の値bBWが帯域幅の閾値Aを超える光ファイバを選択するステップ(102)とを含み、前記閾値Aが、ステップii)で得られる第1のモーダル帯域幅の値BWより大きく、かつ前記第1のモーダル帯域幅の値BWおよび所定の曲げ損失の値BLの関数である、方法。 - 第1のモーダル帯域幅の値BWを決定するステップ(100)の前に、前記複数の光ファイバから、光ファイバが曲げられたときの光ファイバの曲げ損失が所定の閾値を超える光ファイバを予備選択するステップ(90)をさらに含む、請求項1から3のいずれか一項に記載の方法。
- 光ファイバが受ける曲げが、5mmの半径の二巻きである、請求項1から4のいずれか一項に記載の方法。
- 波長850nmにおいて、曲げ損失が、0.5dBより大きく、好ましくは0.8dBより大きい、請求項4および5のいずれかに記載の方法。
- 第1のモーダル帯域幅の値BWを決定するステップ(100)の後に、光ファイバの第1のモーダル帯域幅の値BWが、波長850nmにおいて3150MHz.kmより小さい光ファイバを選択するステップ(92)をさらに含む、請求項1から6のいずれか一項に記載の方法。
- 前記帯域幅の閾値Aが、波長850nmにおいて、4000MHz.kmに等しく、好ましくは5000MHz.kmに等しく、より好ましくは6000MHz.kmに等しい、請求項1から7のいずれか一項に記載の方法。
- モーダル帯域幅および曲げ損失が、それぞれ、i)実効伝送帯域幅および限定入射条件下の曲げ損失か、または、ii)飽和入射条件下の帯域幅および飽和入射条件下の曲げ損失、のいずれかである、請求項1から8のいずれか一項に記載の方法。
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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FR1058485 | 2010-10-18 | ||
FR1058485A FR2966255A1 (fr) | 2010-10-18 | 2010-10-18 | Fibre optique multimode insensible aux pertes par courbures |
FR1156877 | 2011-07-27 | ||
FR1156877A FR2966256B1 (fr) | 2010-10-18 | 2011-07-27 | Fibre optique multimode insensible aux pertes par |
Publications (2)
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JP2012098722A JP2012098722A (ja) | 2012-05-24 |
JP5967892B2 true JP5967892B2 (ja) | 2016-08-10 |
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US (1) | US8891074B2 (ja) |
EP (1) | EP2447749B1 (ja) |
JP (1) | JP5967892B2 (ja) |
CN (1) | CN102455462B (ja) |
DK (1) | DK2447749T3 (ja) |
FR (1) | FR2966256B1 (ja) |
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2011
- 2011-07-27 FR FR1156877A patent/FR2966256B1/fr active Active
- 2011-10-14 JP JP2011226494A patent/JP5967892B2/ja active Active
- 2011-10-18 DK DK11185675T patent/DK2447749T3/en active
- 2011-10-18 EP EP11185675.3A patent/EP2447749B1/en active Active
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CN102455462B (zh) | 2015-06-10 |
DK2447749T3 (en) | 2014-02-24 |
FR2966256A1 (fr) | 2012-04-20 |
JP2012098722A (ja) | 2012-05-24 |
EP2447749A1 (en) | 2012-05-02 |
EP2447749B1 (en) | 2013-12-04 |
FR2966256B1 (fr) | 2012-11-16 |
US20120092651A1 (en) | 2012-04-19 |
US8891074B2 (en) | 2014-11-18 |
CN102455462A (zh) | 2012-05-16 |
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