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Optica Publishing Group
  • Chinese Optics Letters
  • Vol. 10,
  • Issue 7,
  • pp. 070605-070605
  • (2012)

Generation of coherent optical multi-carriers using concatenated, dual-drive Mach-Zehnder and phase modulators

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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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