Demonstration of coherence modulation of light is reported for the fir
st time in the area of acousto-optic signal processing. The method all
ows electro-optic modulation of broadband sources to be used in acoust
o-optic time integrating correlators, with a modulation depth and a dy
namic range comparable to those of coherent systems. Though a single c
oherence-modulated channel is used, it demonstrates that a generalizat
ion of the method to several channels is possible.