Experimental demonstration of a novel all-optical multilevel 4-amplitude-shifted-keying coding/decoding scheme

We demonstrated for the first time an all-optical multilevel 4-amplitude-shifted-keying coding and decoding technique, which encodes two on-off-keying signals into a 4-ASK signal using cross absorption modulation in an electro-absorption modulator and employs fiber-based all-optical approach to facilitate data detection.