All optical XNOR gate using simultaneous four-wave mixing and cross-gain modulation in an SOA


We demonstrate an all-optical XNOR-gate using simultaneous FWM and XGM in an SOA. Error-free operation for 5-Gb/s RZ data with < 2dB power-penalty is reported. The module also performs as a half-adder with inverted 'sum' output. 


4 Figures and Tables