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1. (WO1992009916) OPTICAL SWITCH
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1992/009916 International Application No.: PCT/GB1991/002091
Publication Date: 11.06.1992 International Filing Date: 27.11.1991
Chapter 2 Demand Filed: 07.05.1992
IPC:
G02F 1/35 (2006.01) ,G02F 3/00 (2006.01)
G PHYSICS
02
OPTICS
F
DEVICES 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
1
Devices 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
35
Non-linear optics
G PHYSICS
02
OPTICS
F
DEVICES 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
3
Optical logic elements; Optical bistable devices
Applicants:
BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY [GB/GB]; 81 Newgate Street London EC1A 7AJ, GB (AllExceptUS)
BLOW, Keith, James [GB/GB]; GB (UsOnly)
DORAN, Nicholas, John [GB/GB]; GB (UsOnly)
Inventors:
BLOW, Keith, James; GB
DORAN, Nicholas, John; GB
Agent:
GREENWOOD, John, David; Intellectual Property Department British Telecom 151 Gower Street London WC1E 6BA, GB
PRATT, David, Martin; BT Group Legal Services Intellectuel Property Dept. 13th floor 151 Gower Street London WC1E 6BA, GB
Priority Data:
9025793.227.11.1990GB
Title (EN) OPTICAL SWITCH
(FR) COMMUTATEUR OPTIQUE
Abstract:
(EN) An optical switch comprises an optical fibre Sagnac loop interferometer (2) having an input port (10) and an output port (12). A source of optical signals (26) at 1.53 $g(m)m is coupled to the input port (10) and a source of control optical signals (18, 20) of wavelengths 1.30 $g(m)m and 1.31$g(m)m are coupled to the interferometer (2) by a dichroic coupler (8). The coupler (8) splits the 1.53$g(m)mn input optical signal into two signal portions which counterpropagate round the loop (6) and couples the control signal to propagate in one direction only round the loop (6). The phase difference between the signal portions at the output port (12) is dependent on the intensity of the control optical signal when they recombine at the coupler (8). The optical control signals are formed by combining at least two optical pulse streams, the pulses of distinct optical pulse streams being non-interferometric, to provide a logical AND gate.
(FR) Un commutateur optique comprend un interféromètre (2) à boucle Sagnac à fibres optiques, muni d'un port d'entrée (10) et d'un port de sortie (12). Une source de signaux optiques (26) sur 1,53 $g(m)m est couplée au port d'entrée (10) et une source de signaux optiques de contrôle (18, 20) sur des longueurs d'onde de 1,30$g(m)m et de 1,31$g(m)m est couplée à l'interféromètre (2) par un coupleur dichroïque (8). Le coupleur (8) partage le signal optique d'entrée sur 1,53$g(m)mn en deux parties qui se contrepropagent autour de la boucle (6), et couple le signal de contrôle pour se propager dans une seule direction autour de la boucle (6). Le déphasage entre les parties du signal au port de sortie (12) dépend de l'intensité de signal optique de contrôle lorsqu'elles se recombinent au niveau du coupleur (8). Les signaux optiques de contrôle sont formés par l'association d'au moins deux flux d'impulsions optiques, les impulsions des flux d'impulsions optiques distincts n'étant pas interférométriques, ce qui permet de créer une porte ET logique.
Designated States: CA, JP, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0559811US5473712JPH06507251CA2096522