All-optical XOR operation of 40 Gbit/s phase-shift-keyed data using four-wave mixing in semiconductor optical amplifier

All-optical XOR operation of two 40 Gbit/s phase-shift-keyed data is demonstrated for the first time employing four-wave mixing in a semiconductor amplifier. The XOR operation is performed with 0.7 dB degradation in signal-to-noise ratio Q/sup 2/.