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1. (WO1991007684) OPTICAL ISOLATOR
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/007684 International Application No.: PCT/JP1990/001465
Publication Date: 30.05.1991 International Filing Date: 13.11.1990
IPC:
G02B 27/28 (2006.01) ,G02F 1/01 (2006.01) ,G02F 1/09 (2006.01)
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
27
Other optical systems; Other optical apparatus
28
for polarising
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
01
for the control of the intensity, phase, polarisation or colour
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
01
for the control of the intensity, phase, polarisation or colour
09
based on magneto-optical elements, e.g. exhibiting Faraday effect
Applicants:
NAMIKI PRECISION JEWEL CO., LTD. [JP/JP]; 8-22, Shinden 3-chome Adachi-ku Tokyo 123, JP (AllExceptUS)
KUME, Hiroshi [JP/JP]; JP (UsOnly)
KONNO, Yoshihiro [JP/JP]; JP (UsOnly)
Inventors:
KUME, Hiroshi; JP
KONNO, Yoshihiro; JP
Common
Representative:
NAMIKI PRECISION JEWEL CO., LTD.; Patent Division 8-22, Shinden 3-chome Adachi-ku Tokyo 123, JP
Priority Data:
1/29633714.11.1989JP
2/14961707.06.1990JP
Title (EN) OPTICAL ISOLATOR
(FR) ISOLATEUR OPTIQUE
Abstract:
(EN) An optical isolator comprising a polarizer, an analyzer, a Faraday rotor and a permanent magnet for magnetizing the Faraday rotor and inducing a Faraday effect. Degradation of isolation characteristics occurs near a critical temperature (0 °C or 70 °C) of a practical temperature range of from about 0 to 70 °C if adjustment and assembly are made in such a manner that maximum isolation is accomplished at the ambient temperature and for the wavelength used for the assembly. Therefore, the temperature position of maximum isolation is controlled by assembling the isolator at room temperature and for a wavelength which is shifted by a very small wavelength $g(D)$g(l) from the wavelength $g(l) used so that maximum isolation can be obtained at an arbitrary use temperature by utilizing temperature dependence of the Faraday rotor.
(FR) Isolateur optique comprenant un polariseur, un analyseur, un rotor de Faraday et un aimant permanent qui magnétise le rotor de Faraday et produit un effet de Faraday. Une dégradation des caractéristiques d'isolation se produit à proximité d'une température critique (0 °C ou 70 °C) d'une plage de température pratique allant de 0 à 70 °C si l'ajustement et l'ensemble sont réalisés de manière à obtenir une isolation maximale à température ambiante et à la longueur d'onde utilisée pour l'ensemble. Par conséquent, la position de température d'isolation maximale est régulée grâce à l'assemblage de l'isolateur à température ambiante et en fonction d'une longueur d'onde qui est décalée d'une très faible longueur d'onde $g(D)$g(l) de la longueur d'onde $g(l) utilisée, de manière à obtenir une isolation maximale à n'importe quelle température d'utilisation, grâce au phénomène de dépendance de la température du rotor de Faraday.
Designated States: CA, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: Japanese (JA)
Filing Language: Japanese (JA)
Also published as:
EP0485609US5204868CA2046275