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Polarization sensitivity of an optical exclusive or (XOR) gate based on four-wave mixing (FWM) in highly nonlinear fiber is investigated. FWM is a polarization-sensitive process, and the optical XOR gate can be built using this polarization-sensitive characteristic. The FWM-based optical XOR does not require the input signals to have narrow pulsewidths, and works well for nonreturn-to-zero (NRZ) signals...
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