JP5250565B2 - 光ファイバの分割された利得ドーピング - Google Patents
光ファイバの分割された利得ドーピング Download PDFInfo
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- JP5250565B2 JP5250565B2 JP2009549204A JP2009549204A JP5250565B2 JP 5250565 B2 JP5250565 B2 JP 5250565B2 JP 2009549204 A JP2009549204 A JP 2009549204A JP 2009549204 A JP2009549204 A JP 2009549204A JP 5250565 B2 JP5250565 B2 JP 5250565B2
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 32
- 238000005253 cladding Methods 0.000 claims description 37
- 239000002019 doping agent Substances 0.000 claims description 14
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 229910052761 rare earth metal Inorganic materials 0.000 claims description 10
- 150000002910 rare earth metals Chemical group 0.000 claims description 10
- 239000000377 silicon dioxide Substances 0.000 claims description 5
- 229910052691 Erbium Inorganic materials 0.000 claims description 3
- 229910052769 Ytterbium Inorganic materials 0.000 claims description 3
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 3
- 229920000642 polymer Polymers 0.000 claims description 3
- NAWDYIZEMPQZHO-UHFFFAOYSA-N ytterbium Chemical compound [Yb] NAWDYIZEMPQZHO-UHFFFAOYSA-N 0.000 claims description 3
- 230000003287 optical effect Effects 0.000 abstract description 4
- 239000000835 fiber Substances 0.000 description 63
- 230000005284 excitation Effects 0.000 description 61
- 238000010586 diagram Methods 0.000 description 10
- 238000006243 chemical reaction Methods 0.000 description 7
- 230000001902 propagating effect Effects 0.000 description 6
- 238000010521 absorption reaction Methods 0.000 description 3
- 230000005281 excited state Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000005086 pumping Methods 0.000 description 3
- 238000001069 Raman spectroscopy Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000010791 quenching Methods 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method 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
- 238000000605 extraction Methods 0.000 description 1
- 230000005283 ground state Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06729—Peculiar transverse fibre profile
- H01S3/06733—Fibre having more than one cladding
-
- 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
- G02B6/10—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
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/0672—Non-uniform radial doping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094038—End pumping
-
- 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
- G02B6/02057—Optical fibres with cladding with or without a coating comprising gratings
- G02B6/02076—Refractive index modulation gratings, e.g. Bragg gratings
- G02B6/0208—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response
- G02B6/02085—Refractive index modulation gratings, e.g. Bragg gratings characterised by their structure, wavelength response characterised by the grating profile, e.g. chirped, apodised, tilted, helical
- G02B6/02095—Long period gratings, i.e. transmission gratings coupling light between core and cladding modes
-
- 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
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02342—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by cladding features, i.e. light confining region
- G02B6/02366—Single ring of structures, e.g. "air clad"
-
- 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
- G02B6/03633—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
- G02B6/24—Coupling light guides
- G02B6/42—Coupling light guides with opto-electronic elements
- G02B6/4296—Coupling light guides with opto-electronic elements coupling with sources of high radiant energy, e.g. high power lasers, high temperature light sources
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S2301/00—Functional characteristics
- H01S2301/03—Suppression of nonlinear conversion, e.g. specific design to suppress for example stimulated brillouin scattering [SBS], mainly in optical fibres in combination with multimode pumping
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S2301/00—Functional characteristics
- H01S2301/20—Lasers with a special output beam profile or cross-section, e.g. non-Gaussian
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06708—Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
- H01S3/06729—Peculiar transverse fibre profile
- H01S3/06741—Photonic crystal fibre, i.e. the fibre having a photonic bandgap
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/06—Construction or shape of active medium
- H01S3/063—Waveguide lasers, i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
- H01S3/067—Fibre lasers
- H01S3/06754—Fibre amplifiers
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/05—Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
- H01S3/08—Construction or shape of optical resonators or components thereof
- H01S3/08018—Mode suppression
- H01S3/0804—Transverse or lateral modes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094003—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light the pumped medium being a fibre
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/09—Processes or apparatus for excitation, e.g. pumping
- H01S3/091—Processes or apparatus for excitation, e.g. pumping using optical pumping
- H01S3/094—Processes or apparatus for excitation, e.g. pumping using optical pumping by coherent light
- H01S3/094096—Multi-wavelength pumping
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Lasers (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
- Optical Communication System (AREA)
- External Artificial Organs (AREA)
- Amplifiers (AREA)
- Optical Integrated Circuits (AREA)
Description
この出願は「高次モード増幅器」と題する2007年2月5日に出願された米国特許出願第60/888,114号に対して優先権の利益を主張し、参照のためそのすべてがここに引用される。
115、215 カスケード式ラマン共振器(CRR)
120、220 入力ファイバと利得ドープファイバの接合部
125 信号の基底LP01モード
135 モード変換器
145 伝播光
155、250 利得ドープファイバ
160、255 入力ファイバ
205 信号源
210、610 信号光
230 信号モード変換器
235 信号のLP0mモード
240 励起光モード変換器
255 多重化されたLP01モード光
410 ファイバの断面像
420 HOMの近視野像
430 内側のクラッド
440 空気孔
450 シリカの輪
500 屈折率のチャート
510 屈折率プロファイル
520 HOM信号
560 HOM信号、および利得ドープファイバプロファイル
620、720 励起光
Claims (15)
- 第一の屈折率を有するコアと、
前記コアの半径方向外側に位置する内側クラッドとを含み、前記内側クラッドが第二の屈折率を有し、前記第二の屈折率が前記第一の屈折率よりも小さいものであり、さらに、
予め決められた位置で前記内側クラッドをドーピングする利得ドーパントを含み、前記予め決められた位置は高次モード(HOM)信号の強度プロファイルに対応するものであり、さらに、
前記内側クラッドの半径方向外側に位置する溝を含み、前記溝が第三の屈折率を有し、そして前記第三の屈折率が前記第二の屈折率よりも小さいことを特徴とする光ファイバ。 - 前記コアが利得ドープされていることを特徴とする請求項1に記載の光ファイバ。
- 前記利得ドーパントが希土類ドーパントからなることを特徴とする請求項1に記載の光ファイバ。
- 前記希土類ドーパントがエルビウムからなることを特徴とする請求項3に記載の光ファイバ。
- 前記希土類ドーパントがイッテルビウム(Yb)からなることを特徴とする請求項3に記載の光ファイバ。
- コアと、
前記コアの半径方向外側に位置する内側クラッドと、
予め決められた位置で前記内側クラッドをドーピングする利得ドーパントとを含み、前記予め決められた位置が高次モード(HOM)信号の強度プロファイルに対応することを特徴とする光ファイバ。 - 前記内側クラッドが高い開口数を有する導波路であることを特徴とする請求項6に記載の光ファイバ。
- 前記内側クラッドの半径方向外側に位置する溝をさらに含み、前記溝が前記内側クラッドの屈折率よりも小さい屈折率を有することを特徴とする請求項6に記載の光ファイバ。
- 前記溝が空気からなることを特徴とする請求項8に記載の光ファイバ。
- 前記溝がシリカの網からなることを特徴とする請求項8に記載の光ファイバ。
- 前記溝が屈折率の低いポリマからなることを特徴とする請求項8に記載の光ファイバ。
- 前記強度プロファイルが同心の輪からなることを特徴とする請求項6に記載の光ファイバ。
- 前記利得ドーパントが希土類ドーパントからなることを特徴とする請求項6に記載の光ファイバ。
- 前記希土類ドーパントがエルビウムからなることを特徴とする請求項7に記載の光ファイバ。
- 前記希土類ドーパントがイッテルビウム(Yb)からなることを特徴とする請求項7に記載の光ファイバ。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US88811407P | 2007-02-05 | 2007-02-05 | |
US60/888,114 | 2007-02-05 | ||
PCT/US2008/053057 WO2008097977A2 (en) | 2007-02-05 | 2008-02-05 | Segmented gain-doping of an optical fiber |
Publications (2)
Publication Number | Publication Date |
---|---|
JP2010518633A JP2010518633A (ja) | 2010-05-27 |
JP5250565B2 true JP5250565B2 (ja) | 2013-07-31 |
Family
ID=39682088
Family Applications (6)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2009549201A Pending JP2010518632A (ja) | 2007-02-05 | 2008-02-05 | 信号のモードとは異なる高次モードにおける励起 |
JP2009549207A Pending JP2010518634A (ja) | 2007-02-05 | 2008-02-05 | 信号のモードと本質的に同一である高次モードにおける励起 |
JP2009549204A Active JP5250565B2 (ja) | 2007-02-05 | 2008-02-05 | 光ファイバの分割された利得ドーピング |
JP2009549199A Active JP5250564B2 (ja) | 2007-02-05 | 2008-02-05 | 高次モード(hom)信号の伝播における有効断面積の連続的な増加 |
JP2009549206A Active JP5484073B2 (ja) | 2007-02-05 | 2008-02-05 | 光ファイバの利得ドープ領域の選択的励起 |
JP2009549198A Active JP5276021B2 (ja) | 2007-02-05 | 2008-02-05 | 光ファイバの誘電破壊の防止 |
Family Applications Before (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2009549201A Pending JP2010518632A (ja) | 2007-02-05 | 2008-02-05 | 信号のモードとは異なる高次モードにおける励起 |
JP2009549207A Pending JP2010518634A (ja) | 2007-02-05 | 2008-02-05 | 信号のモードと本質的に同一である高次モードにおける励起 |
Family Applications After (3)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP2009549199A Active JP5250564B2 (ja) | 2007-02-05 | 2008-02-05 | 高次モード(hom)信号の伝播における有効断面積の連続的な増加 |
JP2009549206A Active JP5484073B2 (ja) | 2007-02-05 | 2008-02-05 | 光ファイバの利得ドープ領域の選択的励起 |
JP2009549198A Active JP5276021B2 (ja) | 2007-02-05 | 2008-02-05 | 光ファイバの誘電破壊の防止 |
Country Status (6)
Country | Link |
---|---|
US (6) | US7925128B2 (ja) |
EP (6) | EP2109788B1 (ja) |
JP (6) | JP2010518632A (ja) |
CN (6) | CN101688948B (ja) |
AU (6) | AU2008213822B2 (ja) |
WO (6) | WO2008097958A1 (ja) |
Families Citing this family (33)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN101688948B (zh) * | 2007-02-05 | 2012-01-11 | Ofs菲特尔有限责任公司 | 光纤的分段增益掺杂 |
JP5299959B2 (ja) * | 2008-12-02 | 2013-09-25 | 国立大学法人東北大学 | 光ビーム増幅方法および光ビーム増幅装置 |
WO2010132405A1 (en) * | 2009-05-11 | 2010-11-18 | Ofs Fitel Llc | Filter fiber for use in raman lasing applications and techniques for manufacturing same |
FR2952243B1 (fr) * | 2009-11-03 | 2012-05-11 | Univ Bordeaux 1 | Source optique mettant en oeuvre une fibre dopee, fibre pour une telle source optique et procede de fabrication d'une telle fibre |
US8498044B2 (en) * | 2009-12-22 | 2013-07-30 | Fujikura Ltd. | Amplification optical fiber, and optical fiber amplifier and resonator using the same |
JP5921564B2 (ja) * | 2010-12-03 | 2016-05-24 | オーエフエス ファイテル,エルエルシー | 曲げ補償付き大モード面積光ファイバ |
CN103649797A (zh) * | 2011-02-24 | 2014-03-19 | Ofs飞泰尔公司 | 用于空间多路复用的阶跃折射率少模光纤设计 |
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R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |