4.7 Article

Design of a PAM-4 VCSEL-Based Transceiver Front-End for Beyond-400G Short-Reach Optical Interconnects

Journal

Publisher

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCSI.2022.3179678

Keywords

400GBASE-SR8; transceiver (TRX); vertical-cavity-surface-emitting laser (VCSEL) driver; trans-impedance

Funding

  1. National Key Research and Development Program of China [SQ2021YFB220003]
  2. National Natural Science Foundation of China [61874115]

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This paper presents a hybrid-integrated optical transceiver front-end for beyond-400G short-reach optical links, with developed drivers and transimpedance amplifiers for optical transmission and reception.
This paper presents a hybrid-integrated optical transceiver front-end for beyond-400G short-reach optical links. A pair of the monolithic 8-channel laser drivers and the transimpedance amplifier (TIA) is developed in 180nm SiGe BiCMOS, incorporating arrayed Vertical-Cavity-Surface- Emitting Lasers and photo-detectors. The driver uses a 2nd-order continuous-time linear equalizer (CTLE) to compensate for the channel loss with a nonlinear frequency response. Both the inductive peaking and RC-degeneration are embedded at the output stage to extend the optical modulation bandwidth (BW). The series-peaking and multi-stage distributed CTLE are combined in a resistive feedback TIA topology for improved BW and linearity. Measurement results show up to 100-Gb/s PAM-4 electrical eyes of the driver and TIA. The optical transmitter front-end operates 56 Gb/s, 4.1-dB extinction ratio, and 6.6-pJ/bit power efficiency, while the optical receiver front-end achieves 56-Gb/s, 10-6 bit error rate, and 5.9-pJ/bit power efficiency.

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