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17 January 2011 Hybrid-integrated silicon photonic bridge chips for ultralow-energy inter-chip communications
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We present a hybrid integration technology platform for the compact integration of best-in-breed VLSI and photonic circuits. This hybridization solution requires fabrication of ultralow parasitic chip-to-chip interconnects on the candidate chips and assembly of these by a highly accurate flip-chip bonding process. The former is achieved by microsolder bump interconnects that can be fabricated by wafer-scale processes, and are shown to have average resistance <1 ohm/bump and capacitance <25fF/bump. This suite of technologies was successfully used to hybrid integrate high speed VLSI chips built on the 90nm bulk CMOS technology node with silicon photonic modulators and detectors built on a 130nm CMOS-photonic platform and an SOI-photonic platform; these particular hybrids yielded Tx and Rx components with energies as low as 320fJ/bit and 690fJ/bit, respectively. We also report on challenges and ongoing efforts to fabricate microsolder bump interconnects on next-generation 40nm VLSI CMOS chips.
© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hiren D. Thacker, Ivan Shubin, Ying Luo, Joannes Costa, Jon Lexau, Xuezhe Zheng, Guoliang Li, Jin Yao, Dinesh Patil, Frankie Liu, Ron Ho, Thierry Pinguet, Po Dong, Dazeng Feng, Mehdi Asghari, Kannan Raj, James G. Mitchell, Ashok V. Krishnamoorthy, and John E. Cunningham "Hybrid-integrated silicon photonic bridge chips for ultralow-energy inter-chip communications", Proc. SPIE 7944, Optoelectronic Interconnects and Component Integration XI, 79440B (17 January 2011);

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