Digitally chirped multilayer quantum dot lasers with dual-wavelength lasing emissions

Yi Jan Leo Sun, Pin Hsien Hsieh, Kuo-Jui Lin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The dual-wavelength lasing emissions of digitally chirped multilayer quantum dot (QD) lasers are investigated both experimentally and theoretically. The two lasing wavelengths are both identified as ground-state (GS) emissions but originated from different stacks of QD multilayers. The lasing spectra exhibited broadening and splitting properties by injecting more current. Moreover, the wavelength-resolved light-current characteristics reveal that first GS lasing intensity upon the threshold of second GS transitions neither saturates nor droops with increasing injection current, but increases with slightly reduced slope efficiency. A theoretical model is developed for digitally chirped multilayer QD lasers. The simulation results qualitatively reproduce the experimental observations.

Original languageEnglish
Article number2246
JournalApplied Sciences (Switzerland)
Issue number11
StatePublished - 1 Jun 2019


  • Dual-wavelength lasers
  • Quantum dots
  • Rate equations
  • Semiconductor lasers

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