On-demand Q-switching regime in optically injected dual-section quantum-dot laser

Ana Ribeiro, Adam Fredeerick Forrest, Maria Ana Cataluna

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)
42 Downloads (Pure)


Pure Q-switching (self-pulsating) behaviour is shown for the first time in an optically injected two-section quantum-dot laser. Upon CW optical injection, it was possible to switch the operation regime from free-running mode-locking to locked Q-switching. Under this regime, the pulse repetition rate of around 1 GHz was tunable with injection power (by more than 100 MHz) and absorber reverse bias. Moreover, through injection-locking, the Q-switched output was spectrally tunable by around 7 nm, by tuning the master laser. The seamless switch between mode-locking and Q-switching with optical injection as well as the tunability and control afforded by injection-locking could open up a range of applications, such as in multi-modal imaging. On a more fundamental level, this investigation has also generated new insights into the dynamics of quantum-dot lasers and the optical injection process.

Original languageEnglish
Article number1529605
JournalIEEE Photonics Journal
Issue number3
Early online date28 Apr 2022
Publication statusPublished - Jun 2022


  • Laser mode locking
  • laser tuning
  • optical tuning
  • quantum dot lasers
  • semiconductor lasers
  • ultrafast optics

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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