JP2011113095A - 高帯域マルチモード光ファイバ - Google Patents
高帯域マルチモード光ファイバ Download PDFInfo
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- JP2011113095A JP2011113095A JP2010261867A JP2010261867A JP2011113095A JP 2011113095 A JP2011113095 A JP 2011113095A JP 2010261867 A JP2010261867 A JP 2010261867A JP 2010261867 A JP2010261867 A JP 2010261867A JP 2011113095 A JP2011113095 A JP 2011113095A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 173
- 238000005253 cladding Methods 0.000 claims abstract description 124
- 230000000994 depressogenic effect Effects 0.000 claims abstract description 100
- 238000005452 bending Methods 0.000 claims abstract description 27
- 230000003287 optical effect Effects 0.000 claims abstract description 26
- 230000005284 excitation Effects 0.000 claims description 6
- 230000000694 effects Effects 0.000 abstract description 19
- 238000009826 distribution Methods 0.000 description 17
- 238000000034 method Methods 0.000 description 16
- 230000005540 biological transmission Effects 0.000 description 12
- 238000005259 measurement Methods 0.000 description 12
- 239000010410 layer Substances 0.000 description 10
- 239000006185 dispersion Substances 0.000 description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 6
- 230000008569 process Effects 0.000 description 6
- 239000011521 glass Substances 0.000 description 5
- 239000000758 substrate Substances 0.000 description 5
- 238000005229 chemical vapour deposition Methods 0.000 description 4
- 239000000835 fiber Substances 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000000151 deposition Methods 0.000 description 3
- 229910052731 fluorine Inorganic materials 0.000 description 3
- 239000011737 fluorine Substances 0.000 description 3
- 239000003365 glass fiber Substances 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005137 deposition process Methods 0.000 description 2
- 230000001902 propagating effect Effects 0.000 description 2
- 239000004071 soot Substances 0.000 description 2
- 230000002123 temporal effect Effects 0.000 description 2
- 229910052719 titanium Inorganic materials 0.000 description 2
- 239000010936 titanium Substances 0.000 description 2
- 238000007740 vapor deposition Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000005019 vapor deposition process Methods 0.000 description 1
- 238000004017 vitrification Methods 0.000 description 1
Classifications
-
- 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
- G02B6/02—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 - + - +
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Optical Communication System (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
【解決手段】光ファイバは、外側クラッドに対するアルファ形屈折率分布を有する中心コアと、第1ディプレスト・トレンチと、内側クラッドと、第2ディプレスト・トレンチと、外側クラッド(例えば、外側光学クラッド)とを含む。第2ディプレスト・トレンチの体積は一般に、第1ディプレスト・トレンチの体積より大きい。
【選択図】図2
Description
図1に示されたように、x軸に沿ったピークの場所は、それぞれ異なっており、これが各パルス間のタイムラグ(すなわち、遅延)を表している。この遅延により、得られる光パルスに広がりが出てくる。光パルスの広がりは、 (i)パルスが後に続くパルスと重なるリスクを高め、(ii) 光ファイバによってサポートされる帯域を減少させる。このように、帯域は、光ファイバのマルチモード・コア中を伝搬する光学モードの群遅延時間に直接関係する。従って、広帯域を保証するためには、全てのモードの群遅延時間が同一であることが望ましい。別の言い方をすれば、所与の波長に対して、モード分散はゼロにすべきであり、もしくは少なくとも最小限にすべきである。
α≧1であり、αは、屈折率分布の形を示す無次元パラメータであり、
n1は、光ファイバのコアの最大屈折率であり、
aは、光ファイバのコアの半径であり、
Δは、以下の等式である。
ディプレスト・トレンチが矩形(すなわち、ステップインデックス形分布)である場合、上記等式は以下の等式に単純化され得る。
中心コアのグレーデッドインデックスの終わり部分に対する(すなわち、半径r1における)第1ディプレスト・トレンチの位置および外側クラッドに対する第1ディプレスト・トレンチの屈折率差Δn2は、高帯域の実現を促進する。
Claims (18)
- マルチモード光ファイバであって、その中心から周縁までに、
半径r1と外側クラッドに対するアルファ形屈折率分布とを有する中心コアと、
幅w2と前記外側クラッドに対する屈折率差Δn2と体積v2とを有する第1ディプレスト・トレンチと、
約4μm未満である幅w3と前記外側クラッドに対する屈折率差Δn3とを有する内側クラッドと、
幅w4と前記外側クラッドに対する屈折率差Δn4と体積v4とを有する第2ディプレスト・トレンチと、
外側クラッドと、
を含み、
前記内側クラッドの屈折率差Δn3は、前記第1ディプレスト・トレンチの屈折率差Δn2より大きく、
前記内側クラッドの屈折率差Δn3は、前記第2ディプレスト・トレンチの屈折率差Δn4より大きく、
前記第2ディプレスト・トレンチの体積v4は、前記第1ディプレスト・トレンチの体積v2より大きい、
マルチモード光ファイバ。 - 前記内側クラッドの屈折率差Δn3が約−0.05×10−3〜0.05×10−3である、請求項1に記載のマルチモード光ファイバ。
- 前記内側クラッドの幅w3と前記第1ディプレスト・トレンチの屈折率差Δn2が、以下の不等式を満たす、請求項1に記載のマルチモード光ファイバ。
- 前記第1ディプレスト・トレンチの幅w2が、約0.5〜1.5μmであり、前記第1ディプレスト・トレンチの屈折率差Δn2が、約−4×10−3〜−0.5×10−3である、請求項1に記載のマルチモード光ファイバ。
- 前記第2ディプレスト・トレンチの幅w4が、約3〜5μmであり、前記第2ディプレスト・トレンチの屈折率差Δn4が、約−15×10−3〜−3×10−3である、請求項1に記載のマルチモード光ファイバ。
- 前記第2ディプレスト・トレンチの体積v4が、約200〜1,200%・μm2であり、好ましくは250〜750%・μm2である、請求項1に記載のマルチモード光ファイバ。
- 波長850nmで、15mmの曲げ半径に対して2巻当たり、光ファイバの曲げ損失が0.1dB未満であり、好ましくは0.05dB未満である、請求項1に記載のマルチモード光ファイバ。
- 波長850nmで、10mmの曲げ半径に対して2巻当たり、光ファイバの曲げ損失が0.3dB未満であり、好ましくは0.1dB未満である、請求項1に記載のマルチモード光ファイバ。
- 波長850nmで、7.5mmの曲げ半径に対して2巻当たり、光ファイバの曲げ損失が0.4dB未満であり、好ましくは0.2dB未満である、請求項1に記載のマルチモード光ファイバ。
- 波長850nmで、5mmの曲げ半径に対して2巻当たり、光ファイバの曲げ損失が1dB未満であり、好ましくは0.3dB未満である、請求項1に記載のマルチモード光ファイバ。
- 波長850nmで、半径方向オフセットが24μmで、少なくとも4,000MHz・kmであり、好ましくは10,000MHz・kmである、帯域(ROB24)を有する、請求項1に記載のマルチモード光ファイバ。
- 波長850nmで、少なくとも1,500MHz・kmであり、好ましくは3,500MHz・kmである、全モード励振(OFL)帯域を有する、請求項1に記載のマルチモード光ファイバ。
- 光ファイバの開口数(NA)が、0.200±0.015である、請求項1に記載のマルチモード光ファイバ。
- 前記中心コアのアルファ形屈折率分布が、1.9〜2.1のパラメータαを有する、請求項1に記載のマルチモード光ファイバ。
- 前記外側クラッドに対する前記中心コアの屈折率差は、最大値Δn1が約11×10−3〜18×10−3である、請求項1に記載のマルチモード光ファイバ。
- 波長850nmで、外側DMD値(半径方向オフセット0〜23μmにおけるDMD値)が、0.33ps/m未満であり、好ましくは0.25ps/m未満であり、より好ましくは0.14ps/m未満である、請求項1に記載のマルチモード光ファイバ。
- 請求項1に記載のマルチモード光ファイバの少なくとも一部を含むマルチモード光システム。
- 約100mの距離にわたり、好ましくは約300mの距離にわたり、少なくとも10Gb/sのデータレートを有する、請求項17に記載のマルチモード光システム。
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR0958382 | 2009-11-25 | ||
FR0958382A FR2953030B1 (fr) | 2009-11-25 | 2009-11-25 | Fibre optique multimode a tres large bande passante avec une interface coeur-gaine optimisee |
US26511509P | 2009-11-30 | 2009-11-30 | |
US61/265,115 | 2009-11-30 |
Publications (2)
Publication Number | Publication Date |
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JP2011113095A true JP2011113095A (ja) | 2011-06-09 |
JP5732234B2 JP5732234B2 (ja) | 2015-06-10 |
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Application Number | Title | Priority Date | Filing Date |
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JP2010261867A Active JP5732234B2 (ja) | 2009-11-25 | 2010-11-25 | 高帯域マルチモード光ファイバ |
Country Status (6)
Country | Link |
---|---|
US (1) | US8483535B2 (ja) |
EP (1) | EP2333594B1 (ja) |
JP (1) | JP5732234B2 (ja) |
CN (1) | CN102073099B (ja) |
DK (1) | DK2333594T3 (ja) |
FR (1) | FR2953030B1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
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KR20170047217A (ko) * | 2015-04-29 | 2017-05-04 | 우한 리서치 인스티튜트 오브 포스츠 앤드 텔레커뮤니케이션즈 | 저소모 소량 모드 광섬유 |
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- 2010-11-24 CN CN201010556977.3A patent/CN102073099B/zh active Active
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KR20170047217A (ko) * | 2015-04-29 | 2017-05-04 | 우한 리서치 인스티튜트 오브 포스츠 앤드 텔레커뮤니케이션즈 | 저소모 소량 모드 광섬유 |
JP2017526960A (ja) * | 2015-04-29 | 2017-09-14 | 武漢郵電科学研究院 | 低損失フューモードファイバ(fmf) |
KR101957612B1 (ko) * | 2015-04-29 | 2019-03-12 | 우한 리서치 인스티튜트 오브 포스츠 앤드 텔레커뮤니케이션즈 | 저소모 소량 모드 광섬유 |
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EP2333594A1 (en) | 2011-06-15 |
JP5732234B2 (ja) | 2015-06-10 |
DK2333594T3 (da) | 2013-02-25 |
CN102073099A (zh) | 2011-05-25 |
FR2953030B1 (fr) | 2011-11-18 |
EP2333594B1 (en) | 2013-01-02 |
FR2953030A1 (fr) | 2011-05-27 |
CN102073099B (zh) | 2014-07-30 |
US8483535B2 (en) | 2013-07-09 |
US20110123162A1 (en) | 2011-05-26 |
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