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Data center interconnects (DCIs) will have to support throughputs of 400 Gbpsor more per wavelength in the near future. To achieve such high data rates,coherent modulation and detection is used, which conventionally requireshigh-speed data conversion and signal processing in the digital domain.Alternatively, high-speed signal conditioning and processing could be carriedout in co-designed photonic and electronic integrated circuits, in the opticaland electrical analog domains, respectively, to achieve reduced powerconsumption, latency, form factor, and cost. A few demonstrations of analogdomain processing electronic integrated circuits (EICs), including those ofequalizer and carrier phase recovery (CPR) modules showcase progress in thisdirection in the literature. In this brief, for the first time, we presentintegration of a silicon photonic integrated coherent receiver (ICR) modulewith a CPR module, as a part of a complete coherent receiver solution. A phaseshifter in the ICR (fabricated in a 220 nm silicon-on-insulator technology)receives feedback from a CPR EIC, and the combination compensates for the timevarying phase offset between the modulated signal and the unmodulated carrierin the closed loop configuration. In this proof-of-concept demonstration, wepresent experimental results obtained from the stand-alone silicon photonic ICRalong with its system level integration with CPR chip, for QPSK signals. Thetechnique can be extended to a higher-order modulation format, such as 16-QAM,for data rate scaling. The proposed scheme is suitable for homodyne systems,such as polarization multiplexed carrier based self-homodyne links.

An Analog Signal Processing EIC-PIC Solution for Coherent Data Center Interconnects