Abstract

Integrating optical receivers based on double-sampling architecture exhibit a low-power alternative to those designed around transimpedance amplifiers (TIA). In this paper, we present a 3D-integrated CMOS/silicon-photonic optical receiver. The receiver features a low-bandwidth TIA integrating front-end double-sampling technique and dynamic offset modulation. The copper-pillar-based 3D-integration technology used here enables ultralow parasitics and 40 μm pitch for interconnection. We study different tradeoffs in designing an optical receiver and how to choose between a full-bandwidth TIA front-end and integrating architecture using a resistive front-end or a low-bandwidth TIA front-end. The design methodology is supported by measurements of two 3D-integrated prototypes based on a conventional TIA and a double-sampling integrating receiver. The proposed receiver architecture achieves −14.9 dBm of sensitivity and energy efficiency of 170 fJ/b at 25 Gb/s, while the conventional receiver achieves a sensitivity of −10.4 dBm and energy efficiency of 260 fJ/b at 21.2 Gb/s.

© 2015 IEEE

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