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Laser

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Based on "Electrically pumped
hybrid AlGaInAs-silicon evanescent laser" by Fang et al.

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Laser

  1. 1. Electrically pumpedhybrid AlGaInAs-silicon evanescent laser Jehona Salaj University of Eastern Finland Department of Physics and Mathematics November 13, 2012 Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser
  2. 2. Hybrid integrationIII-V lasers coupled to silicon waveguides. Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser
  3. 3. Hybrid integrationIII-V lasers coupled to silicon waveguides. Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser
  4. 4. Outline 1 Introduction 2 Structure 3 Experiments and results 4 Conclusion Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser
  5. 5. Outline 1 Introduction 2 Structure 3 Experiments and results 4 Conclusion Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser
  6. 6. Introduction Previous approaches Raman lasers Raman amplifiers nano-patterning nanocrystalline-Si structures doping silicon rich oxides with rare earths Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser
  7. 7. Introduction Previous approaches Raman lasers Raman amplifiers nano-patterning nanocrystalline-Si structures doping silicon rich oxides with rare earths Limitations Optical pumping Work at cryogenic temperatures Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser
  8. 8. Introduction Previous approaches Raman lasers Raman amplifiers nano-patterning nanocrystalline-Si structures doping silicon rich oxides with rare earths Limitations Optical pumping Work at cryogenic temperatures Solution Electrically pumped hybrid AlGaInAs-silicon laser - waveguide structure which works at temperatures up to 40◦ C Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser
  9. 9. Outline 1 Introduction 2 Structure 3 Experiments and results 4 Conclusion Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser
  10. 10. Structure Figure : Schematic drawing of the structure of the laser. Optical mode superimposed. Optical mode overlaps 75% with the silicon waveguides and 3% with the quantum wells. Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser
  11. 11. Structure Figure : Electron microscope image of the cross section of a fabricated hybrid AlGaInAs-silicon evanescent laser. Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser
  12. 12. New possibilities Figure : Schematic drawing of an integrated silicon transmitter photonic chip with multiple electrically driven lasers operating simultaneously, all fabricated with a single bonding step. They are all self aligned to silicon modulators and then all combined together with a silicon multiplexer. Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser
  13. 13. Outline 1 Introduction 2 Structure 3 Experiments and results 4 Conclusion Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser
  14. 14. Parameters Figure : The output power for one side coupling with a fiber plotted against current for different temperatures. Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser
  15. 15. Parameters laser threshold 65mA maximum output power 1.8mW maximum lasing temperature 40◦ C waveguide-fiber coupling loss 6dB differential quantum efficiency 12.7% threshold voltage 2V series resistance 7.5Ω Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser
  16. 16. Spectrum Figure : Spectrum of the laser above the threshold. Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser
  17. 17. Limitations Poor heat extraction from the active region Heat generation by the high electrical series resistance of the thin n-layerPossible improvements Reduction of the buried oxide thickness to lower the thermal resistance Narrowing the n-contact distance from the center of waveguide to reduce electrical series resistance Deposition of high reflection coatings onto the waveguide facets to reduce the threshold currentThese improvements should make it possible to reach the 70◦ Crequirements of commercial transmitters. Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser
  18. 18. Figure : Infrared image of 7 lasers operating simultaneously taken fromone of the facets. Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser
  19. 19. Outline 1 Introduction 2 Structure 3 Experiments and results 4 Conclusion Jehona Salaj Electrically pumped hybrid AlGaInAs-silicon evanescent laser

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