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This letter proposes and experimentally demonstrates a simple scheme for generating 40-GBaud carriersuppressed return-to-zero differential quadrature phase shift keying(CSRZ-DQPSK) modulation signals with tunable pulsewidths using two dual-parallel Mach-Zehnder modulators(DPMZMs).The duty cycle of the generated 40-GHz CSRZ-DQPSK pulse train is continuously tuned from 31% to 62%,with the full-width at half-maximum tuned from 7.8 to 15.5 ps,by electrically tuning the delay between the two sine-clock signals in one of the DPMZMs.Error-free performance is achieved after 320-km transmission.
This letter proposes and experimentally demonstrates a simple scheme for generating 40-GBaud carriersuppressed return-to-zero differential quadrature phase shift keying (CSRZ-DQPSK) modulation signals with tunable pulsewidths using two dual-parallel Mach-Zehnder modulators (DPMZMs) cycle of the generated 40-GHz CSRZ-DQPSK pulse train is continuously tuned from 31% to 62% with the full-width at half-maximum tuned from 7.8 to 15.5 ps, by electrically tuning the delay between the two sine-clock signals in one of the DPMZMs.Error-free performance is achieved after 320-km transmission.