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Single mode lasers based on slots suitable for photonic integration.

Qiaoyin Lu1, Weihua Guo, Marta Nawrocka

  • 1School of Physics, Trinity College Dublin, Dublin 2, Ireland. luqi@tcd.ie

Optics Express
|January 26, 2012
PubMed
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This study presents re-growth-free single mode lasers for photonic integration. These lasers demonstrate stable single mode operation and are integrated with electroabsorption modulators for advanced optical applications.

Area of Science:

  • Photonics
  • Semiconductor Lasers
  • Optical Integration

Background:

  • Photonic integration requires compact and efficient laser sources.
  • Re-growth processes can add complexity and cost to laser fabrication.

Purpose of the Study:

  • To demonstrate re-growth-free single mode lasers utilizing etched slots.
  • To integrate these lasers with electroabsorption modulators for functional devices.

Main Methods:

  • Fabrication of 650 μm long single mode lasers with etched slots.
  • Integration of the laser with an electroabsorption modulator.
  • Characterization of laser performance (threshold current, slope efficiency, SMSR) and integrated device performance (extinction ratio, bandwidth).

Main Results:

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  • The fabricated laser achieved a threshold current of ~32 mA and slope efficiency of 0.12 mW/mA.
  • Stable single mode operation with side mode suppression ratio (SMSR) > 50 dB was observed.
  • The integrated laser-modulator device showed an extinction ratio > 10 dB and a bandwidth of ~3 GHz.

Conclusions:

  • Re-growth-free etched slot lasers are suitable for photonic integration.
  • The integrated laser-modulator demonstrates promising performance for optical communication systems.
  • This approach offers a pathway to simplified fabrication of integrated photonic devices.