3 An 8b 160GS/s 57GHz Bandwidth Time-Interleaved DAC and Driver-Based Transmitter with Adaptive Calibration for 800Gb/s Coherent Optical Applications in 5nm

The consistent demand for high-speed wireline communication due to high-performance computing and most recently due to machine learning and artificial intelligence has driven the development of transmitters operating beyond 100Gb/s per lane 1–4 and optical modules operating beyond 400Gb/s 4. High-speed wireline communication requires high-bandwidth high-sampling rate ADCs and DACs with low-jitter PLLs as the main analog building blocks. In this paper, we present an energy-efficient optical transmitter fully integrated in an 800G coherent DSP chip using 4 reconfigurable 60-160GS/s 8b DACs with a 57GHz AFE bandwidth, fabricated in a 5nm FinFET process.