Because electro-optic switches are key elements for the synthesis of large bandwidth, high dynamic, true time delay
optically controlled microwave antennas, we designed, fabricated and characterized a new digital optical switch grown
on InP substrate, and based on carrier-induced effects. The switching time is short (3ns) and there is no added noise on
the optical signal. By introducing this switch in a microwave optical link at 1GHz frequency, we demonstrate that a 72dB
microwave crosstalk (more than 36dB on the optical signal) can be achieved. The low current consumption of 60mA
makes our device suitable for the optical control of microwave antennas.
One of the most important concerns in photonic integrated circuits is the reduction of the propagation path for optical interconnections leading so to a size decrease of active and passive components such as filters or multichannel wavelength (de)multiplexers. In this aim, it is necessary to use monomode optical waveguides with a high optical confinement via a strong index contrast. So the structures reported here consist in 300 nm-wide GaAs nano-wires and nano-gratings inserted in a polymer matrix. The technological process we present hereby allows fabricating symmetric waveguides with square cross-section.