  We analyze the dynamic operation of an optical modulator based on double
graphene-layer(GL) structure utilizing the variation of the GL absorption due
to the electrically controlled Pauli blocking effect. The developed device
model yields the dependences of the modulation depth on the control voltage and
the modulation frequency. The excitation of plasma oscillations in double-GL
structure can result in the resonant increase of the modulation depth, when the
modulation frequency approaches the plasma frequency, which corresponds to the
terahertz frequency for the typical parameter values.
