Theoretical investigation of dual-wavelength packet signal storage with SOA-based dual loop optical buffer

In this paper, we theoretically investigate the dual-wavelength packet signal storage in the semiconductor optical amplifier (SOA)-based dual-loop optical buffer (DLOB). The loadable function of the DLOB is implemented by the cross phase modulation induced by the SOA. The influence of the 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 pulse width, the distortion of output pulse 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 reduced by approximately 30%. The obtained results can provide helpful insight for experimental implementation.