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1. WO1991000535 - A WAVELENGTH DEMULTIPLEXER

Publication Number WO/1991/000535
Publication Date 10.01.1991
International Application No. PCT/GB1990/001024
International Filing Date 03.07.1990
Chapter 2 Demand Filed 15.01.1991
IPC
G02B 6/34 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
24Coupling light guides
26Optical coupling means
34utilising prism or grating
CPC
G02B 6/29314
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides
24Coupling light guides
26Optical coupling means
28having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
293with wavelength selective means
29304operating by diffraction, e.g. grating
29305as bulk element, i.e. free space arrangement external to a light guide
29313characterised by means for controlling the position or direction of light incident to or leaving the diffractive element, e.g. for varying the wavelength response
29314by moving or modifying the diffractive element, e.g. deforming
G02B 6/2938
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides
24Coupling light guides
26Optical coupling means
28having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
293with wavelength selective means
29379characterised by the function or use of the complete device
2938for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
G02B 6/29395
GPHYSICS
02OPTICS
BOPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
6Light guides
24Coupling light guides
26Optical coupling means
28having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
293with wavelength selective means
29379characterised by the function or use of the complete device
29395configurable, e.g. tunable or reconfigurable
Applicants
  • BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY [GB/GB]; 81 Newgate Street London EC1A 7AJ, GB (AllExceptUS)
  • McCARTNEY, David, John [GB/GB]; GB (UsOnly)
  • NICHOLLS, Simon, Thomas [GB/GB]; GB (UsOnly)
Inventors
  • McCARTNEY, David, John; GB
  • NICHOLLS, Simon, Thomas; GB
Agents
  • GREENWOOD, John, David; British Telecommunications public limited company Intellectual Property Unit 151 Gower Street London WC1E 6BA, GB
Priority Data
8915307.604.07.1989GB
Publication Language English (EN)
Filing Language English (EN)
Designated States
Title
(EN) A WAVELENGTH DEMULTIPLEXER
(FR) DEMULTIPLEXEUR DE LONGUEURS D'ONDES
Abstract
(EN)
The apparatus (21) comprises a position tuned volume reflection grating (22), a lens (23), and a broadband mirror (24). An optical signal having a plurality of wavelengths is guided by optical fibre (25) onto lens (23). Lens (23) collimates the signal and focusses it onto filter (22). Grating (22) reflects back a first optical channel having a selected single wavelength back through lens (23) and into fibre (27). A second channel having the remaining wavelengths is transmitted by grating (22), and then reflected back through filter (22) and lens (23) by mirror (24) and into fibre (26). Fibres (25, 26, 27) are held in a fixed position relative to one another by fibre connector ferrule (28) in which they are mounted.
(FR)
L'appareil décrit (21) comprend une grille de réflexion à volume syntonisé par position (22), une lentille (23) et un miroir à large bande (24). Un signal optique présentant plusieurs longueurs d'ondes est guidé par la fibre optique (25) sur la lentille (23). La lentille (23) effectue la collimation du signal et sa focalisation sur le filtre (22). La grille (22) réfléchit un premier canal optique présentant une longueur d'onde unique sélectionnée à travers la lentille (23) jusque dans la fibre (27). Un second canal contenant les longueurs d'ondes restantes est transmis par la grille (22) et est ensuite réfléchi à travers le filtre (22) et la lentille (23) par le miroir (24) jusque dans la fibre (26). Les fibres (25, 26, 27) sont maintenues en position fixe les unes par rapport aux autres au moyen d'une ferrure annulaire (28) de connexion des fibres, dans laquelle elles sont montées.
Also published as
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