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Schematic illustrating the operational principle wherein the demonstrated fully passive XNOR logic can be extended to realize an all-photonic pattern matching algorithm by employing a multi-wavelength laser, a group-velocity dispersive (GVD) line (providing a 1-bit wavelength dependent shift), and a multi-channel FBG-based phase filter. IM: intensity modulator. Demux: Wavelength-division demultiplexer.

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