XPM and SPM response of a chirped DFBSOA all-optical flip-flop

In this paper, deriving a dynamic model based on the coupled-mode and carrier rate equations, we have proposed a new technique to switch ON and OFF of a chirped DFB-SOA all-optical flip-flop based on self phase modulation (SPM) and cross phase modulation (XPM). We have shown that with this technique in an optimized condition into a DFB-SOA with chirped grating can improve the speed limitation in such a device, significantly. Values of the switching ON and OFF times for such an all optical flip-flop, obtain in an optimized condition are about 300 ps and 210 ps, with full width at half maximum (FWHM) of 50 ps and 100 ps and energies of the set and reset pulses, E_set=393 fJ and E_reset=25.55 pJ, respectively. Finite difference time domain (FDTD) method is utilized for the numerical simulations.