The magneto-optic modulator rotates a polarization of a light incident to a magneto-optic
device which causes Faraday effect under such a magnetic field arrangement that
the RF magnetic field has a component perpendicular to a light propagation direction
and the RF magnetic field is directed to more than 30 from the bias
magnetic field direction. The bias magnetic field generator may be a permanent
magnet, while the RF magnetic field generator may be a strip line running along
a waveguide for the incident light. The strip line is fed by an RF electric current
signal. The light beam is modulated at a frequency as high as about 10 GHz. The
modulation depth can be further improved by using an impedance transformer and
magnetic core.
