Photon induced carrier excitation to and escape from Fabry-Perot electron states in the presence of subsequent inelastic scattering is simulated. The Fabry-Perot states exist above a quantum well sandwiched between quarter-wave stacks of potential wells and barriers. Two numerical methods are used: simulation of inelastic scattering via absorbing (optical) potentials, and simulation via Schrödinger Equation Monte Carlo.