320-to-40-Gb/s Optical Demultiplexing Using Four-Wave Mixing in a Quantum-Dot SOA

We report, for the first time, the optical demultiplexing of a 320-Gb/s intensity-modulated signal using four-wave mixing in a quantum-dot semiconductor optical amplifier. Error-free operations were successfully achieved for all the 40-Gb/s channels extracted by the optical demultiplexer.