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As the reach of optical communications continues to shrink, photonics is moving from rack-to-rack datacom links to centimeter-scale in-computer applications (computercom) where different architectures are needed. Integrated optical microring resonators (MRRs) are emerging as an attractive choice for fulfilling the more stringent area and efficiency requirements: They offer scaling by wavelength division multiplexing (WDM) and high bandwidth densities. In this paper we present compact electro-optical transmit (TX) and receive (RX) macros for computercom monolithically integrated in 45&#x00A0;nm CMOS. They operate with MRR modulators and photodetectors and include all necessary electronics and optics to enable optical links between on-chip data sources and sinks. A most compact implementation for thermal stabilization was enabled by sensing the optical device&#x0027;s bias currents in the driving electronics instead of using external operating point sensing optics. Using a field-effect transistor as heating element &#x2014; as is possible in monolithic integration platforms &#x2014; further reduces area and power necessary for thermal control. The TX macro is shown to work for data rates up to 16&#x00A0;Gb&#x002F;s with a 5.5&#x00A0;dB extinction ratio (ER) and 2.4&#x00A0;dB insertion loss (IL). The RX macro demonstrates a sensitivity of 71&#x00A0;&#x00B5;App at 12&#x00A0;Gb&#x002F;s for a BER &#x2264; 10&#x2212;10. An intra-chip link built with the macros achieves &#x2264;2.35&#x00A0;pJ&#x002F;b electrical efficiency and a BER&#x00A0;&#x2264;10&#x2212;10 at 10&#x00A0;Gb&#x002F;s. Both macros are realized within 0.0073&#x00A0;mm2 which amounts to 1.4&#x00A0;Tb&#x002F;s&#x002F;mm2 bandwidth density per macro.

Compact Optical TX and RX Macros for Computercom Monolithically Integrated in 45 nm CMOS