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<p>There is a long-standing prospect of using a single comb laser chip emitting multiple low-noise spectral modes for DWDM data transmission in the O-band. This goal is hindered by unacceptably high total power requirements for such a source to overcome losses in a PIC and to provide at least 1 mW per data channel in a fiber. We solve this problem by simultaneously re-amplifying more than 20 lines depleted after the PIC using a low-noise quantum dot (QD)-based SOA. In this way, we demonstrate O-band DWDM data transmission of a PAM4 signal with a total bit rate of up to 2.3&#xa0;Tb/s in fiber with a single QD comb laser source. The other problem related to the application of semiconductor comb lasers is the insufficiently large interline separation to be compatible with the state-of-the-art DWDM PIC technologies. We present comb laser devices with and without a saturable absorber section, providing up to 23 lines with 100&#xa0;GHz intermode separation, 10 lines with 138&#xa0;GHz separation, 4 lines with 163&#xa0;GHz separation, and 3 lines with 216&#xa0;GHz separation, suitable for data transmission. We show that in the mode-locking regime, both the relative intensity noise (RIN) of the comb laser and the associated bit error rate (BER) are determined by the optical power of the laser mode.</p>

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O-band DWDM data transmission with quantum dot mode-locked comb laser and semiconductor optical amplifier

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月18日

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  • Vasilii V. Belykh,
  • Mikhail S. Buyalo,
  • Janina Rautert,
  • Sergey S. Mikhrin,
  • Vladimir S. Mikhrin,
  • Artem V. Zhabotinskii,
  • Alexey R. Kovsh,
  • Alexey E. Gubenko

摘要

There is a long-standing prospect of using a single comb laser chip emitting multiple low-noise spectral modes for DWDM data transmission in the O-band. This goal is hindered by unacceptably high total power requirements for such a source to overcome losses in a PIC and to provide at least 1 mW per data channel in a fiber. We solve this problem by simultaneously re-amplifying more than 20 lines depleted after the PIC using a low-noise quantum dot (QD)-based SOA. In this way, we demonstrate O-band DWDM data transmission of a PAM4 signal with a total bit rate of up to 2.3 Tb/s in fiber with a single QD comb laser source. The other problem related to the application of semiconductor comb lasers is the insufficiently large interline separation to be compatible with the state-of-the-art DWDM PIC technologies. We present comb laser devices with and without a saturable absorber section, providing up to 23 lines with 100 GHz intermode separation, 10 lines with 138 GHz separation, 4 lines with 163 GHz separation, and 3 lines with 216 GHz separation, suitable for data transmission. We show that in the mode-locking regime, both the relative intensity noise (RIN) of the comb laser and the associated bit error rate (BER) are determined by the optical power of the laser mode.