Observation of Small Sub-Pulses Out of the Delayed-Interference Signal-Wavelength Converter

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  • Sakaguchi Jun
    Department of Electronics Engineering, University of Electro-Communications
  • Nielsen Mads L.
    Research Center COM, Technical University of Denmark
  • Ohira Takashi
    Department of Electronics Engineering, University of Electro-Communications
  • Suzuki Rei
    Department of Electronics Engineering, University of Electro-Communications
  • Ueno Yoshiyasu
    Department of Electronics Engineering, University of Electro-Communications

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The generation of small sub-pulses in the delayed-interference signal-wavelength converter (DISC), which has been studied for use in future 160-Gb/s optical time division multiplexing–wavelength division multiplexing (OTDM–WDM) communication systems, was recently predicted as a potential problem. In this work, we have experimentally verified the generation of such pulses and its mechanism. In the experiments we used 3.8-ps-long 1.56-μm input pulses with repetition frequencies from 12.5 to 25.0 GHz and a cross-correlation monitoring system with a time resolution of approximately 2 ps.

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