A Monolithically Integrated DWDM Si-Photonics Transceiver for Chiplet Optical I/O
N. D. Qi, Qianli Ma, Ang Li, Minye Zhu, Ruoyu Wu, Yongliang Xiong, Yingjie Ma, Haoran Yin, Han Liu, Menghan Yang, Daofa Wang, Peng Wang, Yang Qu, Yujun Xie, Guike Li, Liyuan Liu, Ming Li
Abstract
A monolithically integrated dense wavelength-division multiplexing (DWDM) silicon photonics (SiPh) transceiver is presented. Based on the high-<italic xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">Q</i> micro-ring resonation, four 200-GHz spaced wavelengths transmitting and receiving at 50 Gb/s/<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\lambda $</tex-math> </inline-formula> each are demonstrated. All necessary electronic and photonic circuits are fully integrated on a single CMOS chip, including four-channel driver (Drv), transimpedance amplifier (TIA), micro-ring modulator (MRM), micro-ring filter (MRF), and photodetector (PD). An asymmetric inductive-peaking technique is proposed in the co-designed Drv, compensating for insufficient bandwidth (BW) and dynamic nonlinearity of the MRM. To overcome process and temperature variations, closed-loop wavelength stabilization is accomplished with field-programmable gate array (FPGA) algorithm. Implemented in 45-nm silicon-on-insulator (SOI) CMOS, the experimental results show clear eyes at <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$4{\lambda }{\times }50$</tex-math> </inline-formula>-Gb/s transmitting and receiving, respectively, with <inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">${\lt } 10{^{-12}}$</tex-math> </inline-formula> bit error rate (BER). At 50-Gb/s/lane speed, the proposed transceiver achieves 176 Gb/s/mm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> BW density and 3.5-pJ/bit power efficiency, which is boosted to 224-Gb/s/mm<sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> and 2.85-pJ/bit running at 64 Gb/s/lane. Full-link transceiver and multi-<inline-formula xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> <tex-math notation="LaTeX">$\lambda $</tex-math> </inline-formula> crosstalk experiments are demonstrated at 50 Gb/s.