A 4λ× 50-Gb/s Si Photonic WDM Transmitter with Code-Based Wavelength Calibration and Locking

This paper presents a $4 \lambda \times 50-\mathrm{Gb} / \mathrm{s}$ Si photonic WDM transmitter with four cascaded micro-ring modulators (MRMs), MRM drivers, and a heater controller. A code-based calibration and locking technique ensures optimal modulation performance through on-chip control.