Conclusion: By using the nonlinear gain characteristics of the XGM in SOAs, we have successfully demonstrated all-optical multifunctional logic gates for the simultaneous operation of AND, NOR and XNOR at 10 Gbit/s. We explored the possibility of the complex all-optical logic system by simultaneously realising all-optical logic AND, NOR and XNOR in one format. Since AND, NOR, XNOR are the complementary functions of NAND, OR, XOR, all required six logic functions can be achieved in a single compact system by simply adding an inverter at each logic function.