VARIABLE OPTICAL ATTENUATOR AND ITS INTENSITY ADJUSTMENT METHOD
PROBLEM TO BE SOLVED: To simplify the variable optical attenuator compared with the conventional ones which uses a Faraday element by dispensing with the polarizer and optical analyzer, while using a Faraday element. SOLUTION: This variable optical attenuator is composed of an optical fiber 11 to em...
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| creator | YOSHIHIRO MASASHI HIETA HARUMI WAKABAYASHI KOICHIRO |
| description | PROBLEM TO BE SOLVED: To simplify the variable optical attenuator compared with the conventional ones which uses a Faraday element by dispensing with the polarizer and optical analyzer, while using a Faraday element. SOLUTION: This variable optical attenuator is composed of an optical fiber 11 to emit a light beam to an optical element; a collimator lens 12 to obtain parallel light of the radiated light from the optical fiber 11; a Faraday element 13 which changes the light amount by rotating the polarization plane of the linear polarization in proportion to the strength of the applied magnetic field; a collimator lens 14 to condense the 0th order diffracted light which is not diffracted by the Faraday element 13; an optical fiber 15 to input the light condensed by the collimator lens 14; and a coil 16 to apply a magnetic field to the Faraday element 13 in the direction of the light. This Faraday element 13 is constituted, in such a way that the magnetization direction is different one another in the neighboring magnetic domains, so that the magnetization direction becomes parallel with the direction of light. COPYRIGHT: (C)2005,JPO&NCIPI |
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SOLUTION: This variable optical attenuator is composed of an optical fiber 11 to emit a light beam to an optical element; a collimator lens 12 to obtain parallel light of the radiated light from the optical fiber 11; a Faraday element 13 which changes the light amount by rotating the polarization plane of the linear polarization in proportion to the strength of the applied magnetic field; a collimator lens 14 to condense the 0th order diffracted light which is not diffracted by the Faraday element 13; an optical fiber 15 to input the light condensed by the collimator lens 14; and a coil 16 to apply a magnetic field to the Faraday element 13 in the direction of the light. This Faraday element 13 is constituted, in such a way that the magnetization direction is different one another in the neighboring magnetic domains, so that the magnetization direction becomes parallel with the direction of light. 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SOLUTION: This variable optical attenuator is composed of an optical fiber 11 to emit a light beam to an optical element; a collimator lens 12 to obtain parallel light of the radiated light from the optical fiber 11; a Faraday element 13 which changes the light amount by rotating the polarization plane of the linear polarization in proportion to the strength of the applied magnetic field; a collimator lens 14 to condense the 0th order diffracted light which is not diffracted by the Faraday element 13; an optical fiber 15 to input the light condensed by the collimator lens 14; and a coil 16 to apply a magnetic field to the Faraday element 13 in the direction of the light. This Faraday element 13 is constituted, in such a way that the magnetization direction is different one another in the neighboring magnetic domains, so that the magnetization direction becomes parallel with the direction of light. COPYRIGHT: (C)2005,JPO&NCIPI</abstract><edition>7</edition><oa>free_for_read</oa></addata></record> |
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| subjects | DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF |
| title | VARIABLE OPTICAL ATTENUATOR AND ITS INTENSITY ADJUSTMENT METHOD |
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