| Abstract: | An optical XOR gate is formed as a photonic integrated circuit (PIC) from
two sets of optical waveguide devices on a substrate, with each set of
the optical waveguide devices including an electroabsorption modulator
electrically connected in series with a waveguide photodetector. The
optical XOR gate utilizes two digital optical inputs to generate an XOR
function digital optical output. The optical XOR gate can be formed from
III-V compound semiconductor layers which are epitaxially deposited on a
III-V compound semiconductor substrate, and operates at a wavelength in
the range of 0.8-2.0 .mu.m. |