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  • Pang, Xiaodan, Dr., et al. (author)
  • Gigabit free-space multi-level signal transmission with a mid-infrared quantum cascade laser operating at room temperature
  • 2017
  • In: Optics Letters. - : Optical Society of America. - 0146-9592 .- 1539-4794. ; 42:18, s. 3646-3649
  • Journal article (peer-reviewed)abstract
    • Gigabit free-space transmissions are experimentally demonstrated with a quantum cascaded laser (QCL) emitting at mid-wavelength infrared of 4.65 μm, and a commercial infrared photovoltaic detector. The QCL operating at room temperature is directly modulated using on–off keying and, for the first time, to the best of our knowledge, four- and eight-level pulse amplitude modulations (PAM-4, PAM-8). By applying pre- and post-digital equalizations, we achieve up to 3 Gbit/s line data rate in all three modulation configurations with a bit error rate performance of below the 7% overhead hard decision forward error correction limit of 3.8 × 10−3. The proposed transmission link also shows a stable operational performance in the lab environment.
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