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A novel technique to achieve subtraction of two optical signals based on Four Wave Mixing is presented. It utilizes the subtraction of idler wavelengths by applying a π/2 radians relative phase shift between pump wavelengths.

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