DYNAMIC BEAM-PROPAGATION METHOD FOR FLARED SEMICONDUCTOR POWER-AMPLIFIERS

In this paper, we present the results of a dynamic two-dimensional tim e-domain beam propagation method (two spatial dimensions plus time) fo r simulating travelling wave semiconductor optical amplifiers with non uniform transverse section in pulsed regime. Using the effective refra ctive index method, the paraxial approximation and a moving timeframe, we reduce the scalar wave equation to a nonlinear parabolic partial d ifferential equation for the slow complex envelope of the electric fie ld, Diffraction, refractive index dispersion up to the second order, g ain saturation and gain dispersion are included in the model. We numer ically solve the equation through a locally one-dimensional (LOD) meth od employing both finite-difference techniques and FIT-based pseudospe ctral methods.