Abstract
The generation of coherent optical subcarriers based on a concatenated
dual-drive Mach-Zehnder intensity modulator (IM) and two phase modulators (PMs) is
proposed and experimentally demonstrated. The modulation index and DC bias of PM+IM
modulation are theoretically investigated. Theoretical analysis and numerical study
are also carried out to examine the proposed scheme. We use 25-GHz RF synchronous
sinusoidal signals to drive cascaded two-stage PMs and IM, through which we generate
28 subcarriers with peak power fluctuations less than 4 dB. The measured
tone-to-noise ratio of the subcarrier is higher than 40 dB. The experimental results
show that for 100-Gb/s polarization multiplexing QPSK signal, the receiver
sensitivity of the back-to-back signal is -28.6 dBm, and the power penalty is lower
than 1 dB after 100-km transmission at the BER of 1 × 10<sup>-9</sup>.
© 2012 Chinese Optics Letters
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