Characterization of wavelength-tunable quantum dot external cavity laser for 1.3-μm-waveband coherent light sources

Naokatsu Yamamoto, Kouichi Akahane, Kawanishi Tetsuya, Hideyuki Sotobayashi, Yuki Yoshioka, Hiroshi Takai

Research output: Contribution to journalArticle

44 Citations (Scopus)


A sandwiched sub-nano separator (SSNS) growth technique of producing high-density, high-quality InAs/InGaAs quantum dot (QD) structures on GaAs substrates is proposed. The SSNS technique achieved a density of 8:2×10 10/cm 2 by suppressing giant dot formation. The QD structures fabricated by the SSNS technique were used to form a ridge-type waveguide QD optical gain chip for O-band optical gain. With this chip, we successfully demonstrated the generation of a wavelength-tunable fine-tooth optical frequency comb in the O-band from a QD optical frequency comb laser (QD-CML), and synchronized short-optical-pulse generation (∼14 ps) with gigahertz-order repetition from a hybrid mode-locked QD-CML. We also successfully demonstrated a wavelength tunable QD-ECL with a wide wavelength tuning range (1265-1320 nm) and a narrow linewidth (210 kHz) in the O-band. It is expected that these QD coherent light sources will become attractive photonic devices for many scientific applications in the 1.0-1.3 μm waveband.

Original languageEnglish
Article number02BG08
JournalJapanese journal of applied physics
Issue number2 PART 2
Publication statusPublished - 2012 Feb 1


ASJC Scopus subject areas

  • Engineering(all)
  • Physics and Astronomy(all)

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