Abstract:
Microring modulators (MRMs) with CMOS electronics enable compact low power transmitter solutions for 400G Ethernet and co-packaged optical transceivers. In this article, ...Show MoreMetadata
Abstract:
Microring modulators (MRMs) with CMOS electronics enable compact low power transmitter solutions for 400G Ethernet and co-packaged optical transceivers. In this article, we present a 3-D-integrated 112-Gb/s pulse amplitude modulation (PAM)-4 optical transmitter (OTX) using silicon photonic MRM, on-chip laser, and co-packaged 28-nm CMOS driver. The 3- V_{\mathrm {pp}} driver includes a lookup table (LUT)-based PAM-4 nonlinear equalizer to address static and dynamic MRM nonlinearities. An integrated thermal control method that is insensitive to input power fluctuations is proposed to compensate for the temperature sensitivity of MRMs. PAM-4 measurement results of our OTX at 112 Gb/s show that transmitter dispersion eye closure quaternary (TDECQ) < 1.5 dB is achieved from 28 °C to 55 °C with 7.4-pJ/bit energy efficiency including on-chip laser.
Published in: IEEE Journal of Solid-State Circuits ( Volume: 56, Issue: 1, January 2021)