Four Wave Mixing (FWM) based optical signal-processing techniques are\nreviewed. The use of FWM in arithmetical operation like subtraction, wavelength\nconversion and pattern recognition are three key parts discussed in this paper after a brief\nintroduction on FWM and its comparison with other nonlinear mixings. Two different\napproaches to achieve correlation are discussed, as well as a novel technique to realize all\noptical subtraction of two optical signals.
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