Dual-wavelength mode-locking of novel chirped multilayer quantum-dot lasers

Chun Ping Chiang, Kuo-Jui Lin*, Yu Chen Chen, Hsu Chieh Cheng

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

1 Scopus citations


Monolithic passively mode-locked lasers are investigated based on chirped multilayer InAs/InGaAs QDs. Three chirped wavelengths, with stacking numbers of 2, 3 and 5 layers, are designed with capped InGaAs thickness of 4, 3 and 1 nm, respectively. The ridge-waveguide devices of 5-μm width and 3-mm length are fabricated to have absorber-to-gain length ratio of 1:9. A curve tracer is used to analyze the hysteresis on the light-current curve. Two kinks in the L-I curve are observed at threshold current near 50 mA and at higher current of about 150 mA. The lasing wavelength just above threshold is centered at 1268 nm and the RF spectrum of mode-locking is peaked at 13.32 GHz. At well above threshold of 200 mA, another RF peak at 13.21 GHz occurs that corresponds to shorter lasing wavelength around 1233 nm. The two lasing wavelengths are originated from ground-state transitions of two groups of InAs/InGaAs QDs. Simultaneous dual-wavelength mode-locking is therefore achieved at rather low forward current and low reverse bias by incorporating this novel design of QD structure.

Original languageEnglish
Title of host publicationNanophotonic Materials XIII
EditorsGilles Lerondel, Taleb Mokari, Adam M. Schwartzberg, Stefano Cabrini
ISBN (Electronic)9781510602298
StatePublished - 16 Sep 2016
EventNanophotonic Materials XIII - San Diego, United States
Duration: 30 Aug 201631 Aug 2016

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceNanophotonic Materials XIII
Country/TerritoryUnited States
CitySan Diego


  • dual-wavelength lasers
  • mode-locked lasers
  • molecular beam epitaxy
  • Quantum dots
  • semiconductor lasers


Dive into the research topics of 'Dual-wavelength mode-locking of novel chirped multilayer quantum-dot lasers'. Together they form a unique fingerprint.

Cite this