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We demonstrate ultrafast optical code-division multiple-access nonlinear waveform discrimination at 10 GHz with less than 1 mW coupled into a nonlinear periodically poled lithium niobate waveguide and greater than 20-dB contrast ratio between coded and uncoded waveforms. Excellent signal-to-noise is observed at the system receiver, pointing toward the practicability of nonlinear waveform discrimination in a system environment. Index Terms-Nonlinear thresholding, optical code-divisiondoi:10.1109/lpt.2004.828460 fatcat:7rvuagclrjgbtpg32blfbef6ru