Abstract
We designed a quantum cascade semiconductor optical amplifier (QCSOA) structure for enhanced four-wave mixing (FWM) of short optical pulses in midinfrared. To analyze FWM characteristics in a QCSOA, the evolution in the time and spectral domains of two input optical pulses with different frequencies during propagation is calculated using the finite-difference beam propagation method. Calculated third-order susceptibility responsible for FWM resonance nonlinearity of the modified structure is enhanced by two orders of magnitude. Simulation results reveal that quantum cascade structure parameters and injected pump and probe powers are extremely important in determining the amplified FWM optical pulse characteristics in both the time and frequency domains.
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