2 research outputs found
SEMICONDUCTOR WAVEGUIDES FOR NONLINEAR OPTICAL SIGNAL PROCESSING
This thesis investigates nonlinear effects in semiconductor waveguides for optical
signal processing. Two semiconductor waveguides are studied : nanoporous silicon
waveguide and GaAs/AlGaAs waveguide. First, nonlinear optical properties of
nanoporous silicon waveguides including two-photon absorption, self-phase modulation
and free-carrier effects are characterized and compared with similar measurements conducted
on conventional silicon-on-insulator waveguides. Then, we experimentally demonstrate
10-Gb/s wavelength conversion using cross-amplitude modulation, cross-phase modulation
and four-wave-mixing in GaAs/AlGaAs waveguides. Finally, we propose an ultrafast
optical sampling system based on non-degenerate two-photon absorption in a GaAs
photodiode. Using this technique, we successfully demonstrate a background-suppressed
measurement of quasi 4-Tb/s eye diagrams