Vectorial analysis and modeling of EM wave propagation in second order nonlinear optical waveguide structures

No Thumbnail Available
Journal Title
Journal ISSN
Volume Title
Saudi Digital Library
The aim of this thesis is to formulate an accurate full-wave model inside non-linear optical waveguide structures. A vectorial nonlinear finite-difference time-domain method is used to simulate an integrated optical structure containing second order nonlinearity. A continuous wave TM signal is used as excitation for the simulated waveguide structure at the fundamental wavelength to generate a second harmonic TE signal with a new wavelength. Two theoretical models: the envelop-carrier and envelop-only models are derived by these models to a AlGaAs waveguide structure. The simulated algorithm is enhanced by using the formulation of the perfectly matched layer technique to provide an effective boundary condition. Finite-difference time-domain equations of the second harmonic generation model are produced in both formulations: the envelop-carrier and envelop-only formulations. To reduce the computational time of the simulation, a special numerical technique called moving computational window is used. Simulation results of the second harmonic generation with no-matching, perfect phase-matching, and quasi phase-matching for non-depleted inputs are discussed. Also, depleted input is presented in the simulation results to study the effects of the second harmonic field on the fundamental field.