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1. WO2004006004 - FIBRE DESIGN FOR IMPROVED ACOUSTIC GRATINGS

Publication Number WO/2004/006004
Publication Date 15.01.2004
International Application No. PCT/AU2003/000873
International Filing Date 07.07.2003
IPC
G02B 6/02 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
G02F 1/125 2006.01
GPHYSICS
02OPTICS
FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
01for the control of the intensity, phase, polarisation or colour
11based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
125in an optical waveguide structure
CPC
G02B 6/02057
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides
02Optical fibre with cladding ; with or without a coating
02057comprising gratings
G02B 6/02095
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides
02Optical fibre with cladding ; with or without a coating
02057comprising gratings
02076Refractive index modulation gratings, e.g. Bragg gratings
0208characterised by their structure, wavelength response
02085characterised by the grating profile, e.g. chirped, apodised, tilted, helical
02095Long period gratings, i.e. transmission gratings coupling light between core and cladding modes
G02B 6/02123
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides
02Optical fibre with cladding ; with or without a coating
02057comprising gratings
02076Refractive index modulation gratings, e.g. Bragg gratings
02123characterised by the method of manufacture of the grating
G02F 1/125
GPHYSICS
02OPTICS
FDEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating, or modulating; Non-linear optics
01for the control of the intensity, phase, polarisation or colour 
11based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
125in an optical waveguide structure
Applicants
  • THE UNIVERSITY OF SYDNEY [AU]/[AU] (AllExceptUS)
  • FLEMING, Simon [AU]/[AU] (UsOnly)
  • LIU, Yuqing [CN]/[AU] (UsOnly)
  • AN, Honglin [CN]/[AU] (UsOnly)
Inventors
  • FLEMING, Simon
  • LIU, Yuqing
  • AN, Honglin
Agents
  • FREEHILLS CARTER SMITH BEADLE
Priority Data
200295001605.07.2002AU
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) FIBRE DESIGN FOR IMPROVED ACOUSTIC GRATINGS
(FR) CONCEPTION DE FIBRE POUR RESEAUX ACOUSTIQUES AMELIORES
Abstract
(EN)
An optical fibre (10) is disclosed, the optical fibre (10) includes a core (12) and a cladding (18) formed around the core (12), wherein a position of the core (12) with respect to a centre axis (14) of the optical fibre (10) is chosen such that a coupling efficiency of the optical fibre (10) for coupling between a core mode and a co-propagating mode in the presence of an induced acoustic grating in the optical fibre (10) is increased compared with an efficiency achievable with a concentric core for a given acoustic power. The increased coupling efficiency may be achieved by off-setting a centre axis (16) of the core (12) from the centre axis (14) of the optical fibre (10) by a distance &Dgr;r.
(FR)
L'invention concerne une fibre optique (10) comprenant un coeur (12) et une gaine (18) formée autour du coeur (12), dans laquelle une position du coeur (12) par rapport à l'axe central (14) de la fibre optique (10) est choisie de façon que l'efficacité de couplage de la fibre optique (10), entre un mode guidé et un mode de co-propagation en présence d'un réseau acoustique induit dans la fibre optique (10), soit augmentée par rapport à une efficacité réalisable avec un coeur concentrique pour une puissance acoustique donnée. L'efficacité de couplage augmentée peut être réalisée par décalage d'un axe central (16) du coeur (12) à une distance $g(D)r de l'axe central (14) de la fibre optique (10).
Also published as
Latest bibliographic data on file with the International Bureau