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1. WO1985000483 - METHOD FOR DIRECTLY TRANSMITTING IMAGES

Publication Number WO/1985/000483
Publication Date 31.01.1985
International Application No. PCT/JP1984/000349
International Filing Date 09.07.1984
IPC
G02F 1/35 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
35Non-linear optics
H04B 10/2507 2013.01
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
25Arrangements specific to fibre transmission
2507for the reduction or elimination of distortion or dispersion
CPC
G02F 1/3534
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
353Frequency conversion, i.e. wherein a light beam with frequency components different from those of the incident light beams is generated
3534Three-wave interaction, e.g. sum-difference frequency generation
G02F 1/3538
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
353Frequency conversion, i.e. wherein a light beam with frequency components different from those of the incident light beams is generated
3536Four-wave interaction
3538for optical phase conjugation
H04B 10/2507
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
25Arrangements specific to fibre transmission
2507for the reduction or elimination of distortion or dispersion
Applicants
  • NIPPON TELEGRAPH AND TELEPHONE PUBLIC CORPORATION [JP]/[JP] (AllExceptUS)
  • SAKAI, Jun-ichi [JP]/[JP] (UsOnly)
  • SUGIMURA, Akira [JP]/[JP] (UsOnly)
  • KANAYA, Fumio [JP]/[JP] (UsOnly)
Inventors
  • SAKAI, Jun-ichi
  • SUGIMURA, Akira
  • KANAYA, Fumio
Agents
  • IDE, Naotaka
Priority Data
58/12463011.07.1983JP
58/12463111.07.1983JP
58/12463211.07.1983JP
Publication Language Japanese (JA)
Filing Language Japanese (JA)
Designated States
Title
(EN) METHOD FOR DIRECTLY TRANSMITTING IMAGES
(FR) PROCEDE DE TRANSMISSION DIRECTE D'IMAGES
Abstract
(EN)
An object as an image information source to be transmitted is disposed on the transmitting side. The two-dimensional image of the object is optically formed at the transmitting end of a light transmission path and is directly transmitted to the receiving side. The light transmission path is typically constituted by a multimode optical fiber, in which phase distortion occurs during transmission. For this reason, the two-dimensional image arriving at the receiving side cannot be used as it is. On the receiving side, accordingly, phase distortion is compensated when the two-dimensional image is reproduced. More specifically, information about a light source which intermittently irradiates the object during transmission of the two-dimensional image is transmitted from the transmitting side as a reference light. On the receiving side, a phase conjugate wave is generated in either the reference light or the two-dimensional image which are obtained from the light transmission path, to mix together the reference light and the two-dimensional image, thereby compensating the phase distortion.
(FR)
Un objet tel qu'une source d'information d'image destinée à être transmise est disposée sur le côté émetteur. L'image bidimensionnelle de l'objet est formée optiquement sur l'extrémité émission d'un chemin de transmission de lumière et est directement transmise au côté récepteur. Le chemin de transmission de lumière est constitué généralement par une fibre optique multimode, dans laquelle une distorsion de phase se produit pendant la transmission. Pour cette raison, l'image bidimensionnelle arrivant au côté récepteur ne peut être utilisée telle quelle. Du côté récepteur la distorsion de phase est compensée lors de la reproduction de l'image bidimensionnelle. Plus spécifiquement, des informations sur la source lumineuse irradiant de manière intermittente l'objet pendant la transmission de l'image bidimensionnelle sont transmises du côté émetteur en tant que lumière de référence. Du côté récepteur, une onde à conjugaison de phase est produite soit dans la lumière de référence soit dans l'image bidimensionnelle qui sont obtenues du chemin de transmission de lumière, afin de mélanger la lumière de référence et l'image bidimensionnelle pour compenser la distorsion de phase.
Also published as
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