A Monolithic Polarization Tracking Loop Demonstrated on a 90nm Silicon CMOS-Photonic Platform

We report, to our knowledge, the first monolithically-integrated silicon CMOS-photonic co-designed polarization tracking circuit implemented in a 90nm SOI process. The circuit tracks randomized polarization rotation across the Poincaré sphere, maximizes TE-mode optical power, and experimentally achieves a BER of 10^–11 with 10Gb/s PAM-2 modulation.