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
Number of pages8
JournalApplied Sciences (Switzerland)
Issue number11
StatePublished - 1 Jun 2019


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


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