| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a magneto-optical device which has a variable attenuation function and a light modulation function and is capable of modulation with an electric signal of≥10 kHz frequency. <P>SOLUTION: An optical attenuator modulator is provided with: a Faraday rotation angle varying device 18 which varies the rotation angle of the plane of polarization of light transmitting a Faraday element 14 by a variable magnetic field generated by an electromagnetic 16; and a polarizer 12 and an analyzer 20 which are arranged before and after of the device 18 on the optical axis, and the electromagnet has a yoke 24 made of a soft magnetic ferrite, and a high frequency modulation signal is supplied to a coil 26 wound around the yoke. It is preferable that a fixed magnetic field generated by permanent magnets 10 and 22 is applied to the Faraday element in a direction different from that of the variable magnetic field together with the variable magnetic field generated by the electromagnet. <P>COPYRIGHT: (C)2003,JPO</p> |
