Abstract
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.
© 2011 Chinese Optics Letters
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