We describe an analog self-electro-optic-effect device that gives a di
fference between two optical output powers that is linearly proportion
al to electrical or optical drive, permitting bipolar processing in no
vel image-processing arrays. The device is able to operate over a rang
e of more than four orders of magnitude optical power, from 50 nW to 2
.5 mW, corresponding to uniform incident intensities as low as 3.3 MW/
cm2.