Through-substrate coupling elements for silicon-photonics-based short-reach optical interconnects

Nivesh Mangal; Jeroen Missinne; Joris Van Campenhout; Geert Van Steenberge; Bradley Snyder

doi:10.1117/12.2510594

4 March 2019 Through-substrate coupling elements for silicon-photonics-based short-reach optical interconnects

Nivesh Mangal, Jeroen Missinne, Joris Van Campenhout, Geert Van Steenberge, Bradley Snyder

Proceedings Volume 10924, Optical Interconnects XIX; 109240D (2019) https://doi.org/10.1117/12.2510594
Event: SPIE OPTO, 2019, San Francisco, California, United States

Abstract

Laser integration and photonics chip packaging are the two key challenges that require attention to drive down the cost/bit metric for silicon photonics based optical interconnects. We try to address the latter by demonstrating optical interfaces that fit well in an overall scheme of 2.5D/3D electro-optic integration needed for a high performance computing environment. A through-substrate coupling interface provides the benefit of bonding a silicon photonic chip face-up on a package substrate such that the device-side of the chip remains accessible for die-stacking and fiber-array packaging, thereby offering a promising alternative to flip-chip based packaging. In this paper, we demonstrate three through-substrate coupling elements to enable alignment tolerant and energy-efficient integration of silicon photonics with board-level or package-level optical interconnects : (i) a downward directionality O-band grating coupler with a peak -2.3 dB fiber-to-silicon waveguide coupling efficiency; (ii) polymer microlenses hybrid integrated onto the substrate of a silicon photonic chip to produce an expanded collimated beam at λ=1310 nm for a distance of more than 600 μm; (iii) a ball lens placed in a through-package via to result in a 14 μm chip-to-package 1-dB lateral alignment tolerance for coupling into a 20×24 µm squared cross-section board-level polymer waveguide.

Citation Download Citation

Nivesh Mangal, Jeroen Missinne, Joris Van Campenhout, Geert Van Steenberge, and Bradley Snyder "Through-substrate coupling elements for silicon-photonics-based short-reach optical interconnects", Proc. SPIE 10924, Optical Interconnects XIX, 109240D (4 March 2019); https://doi.org/10.1117/12.2510594

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