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Proceedings Paper

3D hybrid integration for active silicon photonics (Conference Presentation)
Author(s): Jonathan Klamkin

Paper Abstract

Despite years of research and development, integrated laser sources remain a bottleneck for silicon photonics (SiPh). Integration of lasers into SiPh can be categorized as hybrid, heterogeneous, or monolithic. Hybrid approaches are the most mature. One example is the co-packaging of lasers with micro-optics and subsequent coupling of laser light to silicon waveguides. More scalable hybrid approaches include butt coupling of lasers and silicon waveguides without the use of micro-optics. This could be accomplished with two chips mounted side by side on a common carrier or by flip-chip bonding of laser chips into recesses adjacent to silicon waveguides. Heterogeneous approaches involve the intimate merging of traditionally incompatible materials and subsequent co-fabrication of these materials to form devices. This approach allows for best-in-class materials selection, however, co-fabrication requires complex fabrication processes. The term monolithic ordinarily refers to a single substrate and materials compatible with the substrate material. Germanium on silicon could be considered a monolithic approach, as could growth of III-V materials (such as indium phosphide (InP) and gallium arsenide) on silicon. This paper summarizes a novel 3D hybrid integration approach that is scalable, low cost, reliable, and that demonstrates superior thermal performance. The approach is based on flip-chip bonding and vertical coupling between InP and silicon waveguides. For the InP waveguide, vertical emission is achieved with a total internal reflection turning mirror. For the silicon waveguide, vertical coupling is achieved with a grating coupler. The InP chip is flip-chip bonded directly to the silicon substrate providing an effective heat sink.

Paper Details

Date Published: 26 April 2017
PDF: 1 pages
Proc. SPIE 10131, Next-Generation Optical Networks for Data Centers and Short-Reach Links IV, 1013102 (26 April 2017); doi: 10.1117/12.2251062
Show Author Affiliations
Jonathan Klamkin, Univ. of California, Santa Barbara (United States)

Published in SPIE Proceedings Vol. 10131:
Next-Generation Optical Networks for Data Centers and Short-Reach Links IV
Atul K. Srivastava, Editor(s)

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