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1. WO2009014623 - LARGE-MODE-AREA OPTICAL FIBER

Publication Number WO/2009/014623
Publication Date 29.01.2009
International Application No. PCT/US2008/008689
International Filing Date 16.07.2008
IPC
G02B 6/14 2006.01
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
10of the optical waveguide type
14Mode converters
G02B 6/036 2006.01
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
02Optical fibre with cladding
036core or cladding comprising multiple layers
H01S 3/067 2006.01
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
06Construction or shape of active medium
063Waveguide lasers, e.g. laser amplifiers
067Fibre lasers
CPC
G02B 6/024
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides
02Optical fibre with cladding ; with or without a coating
024with polarisation maintaining properties
G02B 6/03644
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides
02Optical fibre with cladding ; with or without a coating
036core or cladding comprising multiple layers
03616Optical 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
03638having 3 layers only
03644arranged - + -
G02B 6/03661
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides
02Optical fibre with cladding ; with or without a coating
036core or cladding comprising multiple layers
03616Optical 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
03661having 4 layers only
G02B 6/03688
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides
02Optical fibre with cladding ; with or without a coating
036core or cladding comprising multiple layers
03616Optical 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
03688having 5 or more layers
G02B 6/14
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides
10of the optical waveguide type
14Mode converters
H01S 3/06708
HELECTRICITY
01BASIC ELECTRIC ELEMENTS
SDEVICES 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
3Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
05Construction or shape of optical resonators; Accommodation of active medium therein; Shape of active medium
06Construction or shape of active medium
063Waveguide lasers, ; i.e. whereby the dimensions of the waveguide are of the order of the light wavelength
067Fibre lasers
06708Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering
Applicants
  • CORNING INCORPORATED [US]/[US] (AllExceptUS)
  • CHEN, Xin [US]/[US] (UsOnly)
  • KOH, Joohyun [KR]/[US] (UsOnly)
  • LI, Ming-Jun [US]/[US] (UsOnly)
  • LIU, Anping [US]/[US] (UsOnly)
  • WANG, Ji [CN]/[US] (UsOnly)
  • ZENTENO, Luis, A. [US]/[US] (UsOnly)
Inventors
  • CHEN, Xin
  • KOH, Joohyun
  • LI, Ming-Jun
  • LIU, Anping
  • WANG, Ji
  • ZENTENO, Luis, A.
Agents
  • SHORT, Svetlana, Z.
Priority Data
60/961,37720.07.2007US
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) LARGE-MODE-AREA OPTICAL FIBER
(FR) FIBRE OPTIQUE À GRANDE SURFACE MODALE
Abstract
(EN)
A large-mode-area (LMA) optical fiber (10) that operates as a single-mode optical fiber. The optical fiber includes a core region (20) surrounded by an inner cladding (32), which in turn is surrounded by an outer cladding (40). The inner cladding includes at least one up-doped ring region (32R1). The ring region is configured to form a large attenuation differential between the higher-order modes and the fundamental mode so only that the fundamental mode remains traveling in the optical fiber. If necessary, the optical fiber can include a bend (10B) having a select 'resonant' bend diameter (DB) that increases the relative attenuation of the fundamental and higher-order modes. The optical fiber supports an effective mode field diameter (MFD) of up to 40 µm to 50 µm. As a result, detrimental non-linear effects are suppressed, which allows the optical fiber to carry substantially more optical power than conventional LMA optical fibers. The LMA optical fiber is thus eminently suited for a number of optical-fiber-based applications calling for high optical power, such as fiber lasers and pump sources for wavelength conversion.
(FR)
L'invention porte sur une fibre optique (10) à grande surface modale (LMA) qui fonctionne comme une fibre optique monomodale. La fibre optique comprend une région centrale (20) entourée par un gainage interne (32), qui à son tour est entouré par un gainage externe (40). Le gainage interne comprend au moins une région d'anneau surdopée (32R1). La région d'anneau est configurée pour former un différentiel d'atténuation important entre les modes d'ordre supérieur et le mode fondamental de telle sorte que seul le mode fondamental continue de se propager dans la fibre optique. Si nécessaire, la fibre optique peut comprendre une courbure (10B) ayant un diamètre de courbure « résonant » sélectionné (DB) qui augmente l'atténuation relative des modes fondamental et d'ordre supérieur. La fibre optique supporte un diamètre de champ de mode effectif (MFD) jusqu'à 40 µm à 50 µm. En conséquence, des effets linéaires préjudiciaux sont supprimés, ce qui permet à la fibre optique de porter sensiblement plus de puissance optique que des fibres optiques LMA classiques. La fibre optique LMA est ainsi éminemment appropriée pour un certain nombre d'applications à base de fibre optique nécessitant une puissance optique élevée, telles que des lasers à fibre et des sources de pompage pour une conversion de longueur d'onde.
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