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A new technique to generate 40-GHz carrier-suppressed return-to-zero(CSRZ) optical pulse trains using only a 10-GHz dual-parallel Mach-Zehnder modulator(MZM) is presented and experimentally demonstrated.The spectrum of the generated CSRZ pulses is calculated by simulation and compared with conventional MZM-based RZ and CSRZ pulse trains.The experimental results demonstrate that CSRZ pulse trains are obtained,and that the carrier and the unwanted 20-GHz low-frequency component are suppressed by 25 dB.The technique can also be extended to 160-GHz CSRZ pulse generation when 40-GHz devices are employed.
A new technique to generate 40-GHz carrier-suppressed return-to-zero (CSRZ) optical pulse trains using only a 10-GHz dual-parallel Mach- Zehnder modulator (MZM) was presented and experimentally demonstrated. Spectrum of the generated CSRZ pulses is calculated by simulation and compared with conventional MZM-based RZ and CSRZ pulse trains. The experimental results demonstrate that CSRZ pulse trains are obtained, and that the carrier and the unwanted 20-GHz low-frequency components are suppressed by 25 dB. The technique can also be extended to 160-GHz CSRZ pulse generation when 40-GHz devices are employed.