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Abstract
In this paper, we investigate the dual-wavelength packet signal storage in the semiconductor optical amplifier (SOA)-based dual-loop optical buffer (DLOB). The loadable and unloadable function of the DLOB is implemented by the cross phase modulation induced by the SOA. After a temporal model is proposed for the dual-wavelength packet signal interaction, the influence of nonlinear phase shift on the chirp and distortion of the stored packet pulse is examined for the case of the dual wavelength loadable operation. It is found that, when the overlapping area of the stored dual-wavelength pulse is less than half of the pulsewidth, the distortion of output pulses after storage is negligibly small. However the most severe distortion appears when the dual-wavelength pulses overlap completely. The peak power of output packet pulse is approximately reduced by 30%. The observed experimental results agree well with the theoretical calculation. In a conclusion, these works confirm the validity of the proposed model to investigate the dual-wavelength packet signal operation.