In
telecommunications, an
electro-optic modulator is an optical device in which a
signal-controlled element is used to modulate a
beam of
light. The
modulation may be imposed on the
phase,
frequency, amplitude, or direction of the modulated beam. Modulation bandwidths extending into the
gigahertz[?] range are possible with the use of
laser-controlled modulators.
Source: Federal Standard 1037C and MIL-STD-188