Efficient, high-power, narrow-linewidth, continuous-wave quantum-dot semiconductor comb laser

Mikhail Buyalo; Alexey Gubenko; Sergey Mikhrin; Vladimir Mikhrin; Alexey R Kovsh; Ashok V Krishnamoorthy

doi:10.1038/s41598-024-53609-9

Efficient, high-power, narrow-linewidth, continuous-wave quantum-dot semiconductor comb laser

Sci Rep. 2024 Feb 20;14(1):4197. doi: 10.1038/s41598-024-53609-9.

Authors

Mikhail Buyalo¹, Alexey Gubenko¹, Sergey Mikhrin¹, Vladimir Mikhrin¹, Alexey R Kovsh², Ashok V Krishnamoorthy^{3

4}

Affiliations

¹ Innolume GmbH, Dortmund, Germany.
² Alfalume Inc., Los Gatos, CA, USA.
³ Alfalume Inc., Los Gatos, CA, USA. Ashok@axalume.com.
⁴ Axalume Inc., San Diego, CA, USA. Ashok@axalume.com.

Abstract

We report a continuous-wave, O-band quantum-dot semiconductor comb laser for WDM optical interconnects exhibiting a 2.2 THz optical bandwidth with up to 89 comb wavelengths spaced at 25 GHz, over 30% peak ex-facet electrical-to-optical power conversion efficiency, up to 270 mW of usable laser power, relative intensity noise below - 135 dB/Hz per individual mode, individual laser mode linewidth of 140 kHz, mode beating linewidths of 50 kHz across all modes, and stable far-field output with 75% coupling efficiency to PM fiber in a butterfly package.