JP2008020919A - 曲げに対する向上した抵抗力を有するファイバ構造体 - Google Patents
曲げに対する向上した抵抗力を有するファイバ構造体 Download PDFInfo
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- JP2008020919A JP2008020919A JP2007184018A JP2007184018A JP2008020919A JP 2008020919 A JP2008020919 A JP 2008020919A JP 2007184018 A JP2007184018 A JP 2007184018A JP 2007184018 A JP2007184018 A JP 2007184018A JP 2008020919 A JP2008020919 A JP 2008020919A
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- 239000000835 fiber Substances 0.000 title claims abstract description 117
- 230000001902 propagating effect Effects 0.000 claims abstract description 6
- 230000003534 oscillatory effect Effects 0.000 claims abstract description 4
- 238000005452 bending Methods 0.000 claims description 54
- 239000013307 optical fiber Substances 0.000 claims description 6
- 230000003321 amplification Effects 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 230000003287 optical effect Effects 0.000 claims description 4
- 238000000034 method Methods 0.000 claims 10
- 230000008878 coupling Effects 0.000 description 10
- 238000010168 coupling process Methods 0.000 description 10
- 238000005859 coupling reaction Methods 0.000 description 10
- 238000005253 cladding Methods 0.000 description 5
- 238000013459 approach Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000007423 decrease Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000010287 polarization Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000007704 transition Effects 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
- G02B6/036—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
- G02B6/03688—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 5 or more 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
-
- 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
- G02B6/02004—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
- G02B6/02023—Based on higher order modes, i.e. propagating modes other than the LP01 or HE11 fundamental mode
-
- 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
- G02B6/0283—Graded index region external to the central core segment, e.g. sloping layer or triangular or trapezoidal layer
-
- 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
-
- 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
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/14—Mode converters
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Fibers, Optical Fiber Cores, And Optical Fiber Bundles (AREA)
- Lasers (AREA)
Abstract
【解決手段】本LMAファイバは、伝播するモードの実効屈折率がコアの大部分にわたって曲げられたファイバの「等価」屈折率未満にとどまるように高振動性モードを使用する。減少された実効屈折率を信号モードに与えることによって、コアの「禁じられた」(エバネセント)領域が減少され、伝播するモードの曲げにより誘起される歪みが大幅に回避される。
【選択図】図4
Description
本発明は、国立標準技術研究所(NIST)により授与された授与番号70NANB4H3035のNIST ATPプログラムに基づく米国政府の支援で作成された。米国政府は本発明に一定の権利を有する。
Claims (9)
- 曲げにより誘起される歪みが最小化されるように光信号をラージ・モード・エリア(LMA)光ファイバ内で伝播させる方法であって、
Rcoreと定義される半径およびncoreと定義される屈折率とを伴うコア領域を有するLMAファイバを用意する工程を含み、前記LMAファイバは、所定の曲げ半径Rbendに沿って曲げられたときに曲げられたファイバの屈折率Δnbendを示すものであり、さらに、
前記LMA光ファイバ内を規定波長λで伝播する高振動性モードの信号から出力信号を結合する工程とを含み、前記高振動性モードの信号は有効モード・エリアAeffを示し、そして、前記高振動性モードは、ncore−neff(すなわちΔneff)が曲げにより誘起される歪みを最小化するのに十分な所定のしきい値よりも大きくなるような実効屈折率neffを示すように選択されることを特徴とする方法。 - 前記所定のしきい値がC1Δnbendと定義され、ここでC1は、許容できる程度の曲げにより誘起される歪みと関連する所定の定数であることを特徴とする請求項1に記載の方法。
- 前記所定のしきい値がC2(λ2/Aeff)と定義され、ここでC2は、許容できる程度の曲げにより誘起される歪みと関連する所定の定数であることを特徴とする請求項1に記載の方法。
- 前記所定のしきい値がC3(λ/Rcore)2と定義され、ここでC3は、許容できる程度の曲げにより誘起される歪みと関連する所定の定数であることを特徴とする請求項1に記載の方法。
- 前記有効コア面積Aeffは600μm2より大きいことを特徴とする請求項1に記載の方法。
- 前記高振動性モードの信号は、LP03モードの実効屈折率より下の実効屈折率を伴う高次モードを備えることを特徴とする請求項1に記載の方法。
- 前記LMAファイバは前記コア領域の内部に増幅利得用材料を含むことを特徴とする請求項1に記載の方法。
- 前記LMAファイバは、前記高振動性の信号を前記LMAファイバの中にまたは前記LMAファイバから効率的に結合させることを可能とするように構成された屈折率プロファイルを示す請求項1に記載の方法。
- 前記LMAファイバは微細構造化された領域を備える請求項1に記載の方法。
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/487,258 US7257293B1 (en) | 2006-07-14 | 2006-07-14 | Fiber structure with improved bend resistance |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2008020919A true JP2008020919A (ja) | 2008-01-31 |
JP4612019B2 JP4612019B2 (ja) | 2011-01-12 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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JP2007184018A Expired - Fee Related JP4612019B2 (ja) | 2006-07-14 | 2007-07-13 | 曲げに対する向上した抵抗力を有するファイバ構造体 |
Country Status (3)
Country | Link |
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US (1) | US7257293B1 (ja) |
JP (1) | JP4612019B2 (ja) |
CN (1) | CN101105551B (ja) |
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US8218928B2 (en) * | 2009-04-23 | 2012-07-10 | Ofs Fitel, Llc | Spatial filtering of higher order modes in multimode fibers |
US20100284656A1 (en) * | 2009-05-07 | 2010-11-11 | Ofs Fitel, Llc | Short profile optical connector |
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US9507084B2 (en) | 2010-12-03 | 2016-11-29 | Ofs Fitel, Llc | Single-mode, bend-compensated, large-mode-area optical fibers designed to accomodate simplified fabrication and tighter bends |
US10226837B2 (en) | 2013-03-15 | 2019-03-12 | Nlight, Inc. | Thermal processing with line beams |
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US9837783B2 (en) | 2015-01-26 | 2017-12-05 | Nlight, Inc. | High-power, single-mode fiber sources |
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Also Published As
Publication number | Publication date |
---|---|
JP4612019B2 (ja) | 2011-01-12 |
US7257293B1 (en) | 2007-08-14 |
CN101105551A (zh) | 2008-01-16 |
CN101105551B (zh) | 2010-10-27 |
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