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1. WO2022010422 - METHOD AND DEVICE FOR OPTICAL POWER LIMITER

Publication Number WO/2022/010422
Publication Date 13.01.2022
International Application No. PCT/SG2021/050403
International Filing Date 09.07.2021
IPC
G02F 1/35 2006.1
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
35Non-linear optics
G02F 1/01 2006.1
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
H04B 10/564 2013.1
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
10Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
50Transmitters
564Power control
H04B 10/70 2013.1
HELECTRICITY
04ELECTRIC COMMUNICATION TECHNIQUE
BTRANSMISSION
10Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
70Photonic quantum communication
Applicants
  • NATIONAL UNIVERSITY OF SINGAPORE [SG]/[SG]
Inventors
  • WANG, Chao
  • ZHANG, Gong
  • LIM, Ci Wen
Agents
  • VIERING, JENTSCHURA & PARTNER LLP
Priority Data
10202006635S09.07.2020SG
Publication Language English (en)
Filing Language English (EN)
Designated States
Title
(EN) METHOD AND DEVICE FOR OPTICAL POWER LIMITER
(FR) PROCÉDÉ ET DISPOSITIF DE LIMITEUR DE PUISSANCE OPTIQUE
Abstract
(EN) An optical power limiter, a method of fabricating the optical power limiter, a method of limiting optical power, a method of upper bounding information leakage in quantum cryptography, and a quantum cryptography system. The optical power limiter comprises an optical input port; an optical output port; an effective medium disposed between the input port and the output port; and a diaphragm disposed between the effective medium and the output port; wherein the effective medium has a thermo-optic coefficient such that a light beam entering the effective medium from the direction of the input port experiences a refractive index gradient in a direction perpendicular to a propagation direction in the effective medium as a result of absorption; and wherein the diaphragm is disposed in a path of the light beam for limiting how much of the light beam reaches the output port.
(FR) Limiteur de puissance optique, procédé de fabrication du limiteur de puissance optique, procédé de limitation de puissance optique, procédé de fuite d'informations de délimitation supérieure dans la cryptographie quantique, et système de cryptographie quantique. Le limiteur de puissance optique comprend un orifice d'entrée optique; un orifice de sortie optique; un milieu efficace disposé entre l'orifice d'entrée et l'orifice de sortie; et un diaphragme disposé entre le milieu actif et l'orifice de sortie; le milieu efficace ayant un coefficient thermo-optique de telle sorte qu'un faisceau lumineux entrant dans le milieu efficace depuis la direction de l'orifice d'entrée subit un gradient d'indice de réfraction dans une direction perpendiculaire à une direction de propagation dans le milieu efficace suite à l'absorption; et le diaphragme est disposé dans un trajet du faisceau lumineux pour limiter la quantité de faisceau lumineux atteignant l'orifice de sortie.
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