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The tolerance against self-phase modulation (SPM) of three differential phase-shift keying (DPSK) modulation schemes viz. conventional DPSK (CDPSK), symmetrical DPSK (SDPSK) and pi/4-DPSK in a 40-Gb/s multi-span dispersion compensated single-mode fiber (SMF) link is studied through detailed numerical simulation. The study takes into account the influence of pulse duty-ratio, tight optical filtering,...
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