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Logical Operations by Pulse Modulation in Nonlinear Directional Coupler

Implementation of logical gates by pulse modulation in nonlinear fiber directional coupler is investigated numerically. We consider pulses from an optical time-division multiplex system operating with pulse-position modulation (PPM). Such a system is simulated by a PPM modulator. The study shows that with a proper phase control it is possible to accomplish logical operations.

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