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Characteristics of optical phase conjugation of picosecond pulses in semiconductor optical amplifiers

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2 Author(s)
Tang, J.M. ; Sch. of Electron. Eng. & Comput. Syst., Univ. of Wales, Bangor, UK ; Shore, K.A.

Nondegenerate four-wave mixing (FWM) of picosecond optical pulses in semiconductor optical amplifiers is investigated theoretically, taking into account various carrier processes, probe depletion, and cross-gain modulation effects. Analytical solutions for greatly simplified coupled-wave mixing equations are obtained from which conditions where probe depletion and cross-gain modulation effects cannot be neglected are found. On the other hand, the frequency detuning dependence of optimum input pump pulse energy and shaping of output conjugate pulses are observed from numerical simulations. In particular, calculations show that the frequency symmetry of conjugate and probe pulses with respect to the pump pulse does not hold for optical pulse FWM. Two-photon absorption and ultrafast nonlinear refraction effects are shown to decrease the FWM conversion efficiency

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Quantum Electronics, IEEE Journal of  (Volume:35 ,  Issue: 7 )