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26 February 2020 Epitaxial integration of high-performance quantum-dot lasers on silicon
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Proceedings Volume 11285, Silicon Photonics XV; 1128504 (2020) https://doi.org/10.1117/12.2542912
Event: SPIE OPTO, 2020, San Francisco, California, United States
Abstract
Direct epitaxial growth of III-V lasers on silicon provides the most economically favorable means of photonic integration but has traditionally been hindered by poor material quality. Relative to commercialized heterogeneous integration schemes, epitaxial growth reduces complexity and increases scalability by moving to 300 mm wafer diameters. The challenges associated with the crystalline mismatch between III-Vs and Si can be overcome through optimized buffer layers including thermal cyclic annealing and metamorphic layers, which we have utilized to achieve dislocation densities < 7×106 cm-2. By combining low defect densities with defect-tolerant quantum dot active regions, native substrate performance levels can be achieved. Narrow ridge devices with threshold current densities as low as ~130 A/cm2 have been demonstrated with virtually degradation free operation at 35°C over 11,000 h of continuous aging at twice the initial threshold current density (extrapolated time-to-failure >10,000,000 h). At 60°C, lasers with extrapolated time-to-failure >50,000 h have been demonstrated for >4,000 h of continuous aging. Lasers have also been investigated for their performance under optical feedback and showed no evidence of coherence collapse at back-reflection levels of 100% (minus 10% tap for measurement) due to the ultralow linewidth enhancement factor (αH < 0.2) and high damping of the optimized quantum dot active region.
Conference Presentation
© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Justin C. Norman, Songtao Liu, Yating Wan, Zeyu Zhang, Chen Shang, Jennifer G. Selvidge, Mario Dumont, M. J. Kennedy, Daehwan Jung, Jianan Duan, Heming Huang, Robert W. Herrick, Frederic Grillot, Arthur C. Gossard, and John E. Bowers "Epitaxial integration of high-performance quantum-dot lasers on silicon", Proc. SPIE 11285, Silicon Photonics XV, 1128504 (26 February 2020); https://doi.org/10.1117/12.2542912
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