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Pulse-overlapped transmission employing RZ-DPSK is investigated. The nonlinear phase noise from Gordon-Mollenauer effect is reduced, while there exists another noise source resulting from intrachannel FWM. Simulations show superior 40-Gbit/s RZ-PDSK transmission over a NZDSF link
A 40 Gb/s duobinary and modified duobinary transmitter based on an optical one-bit-delay interferometer was demonstrated experimentally. Good back-to-back performance was obtained with this transmitter
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