Compact WDM Coherent Transmitter using Silicon Micro-Ring Modulators

We present a compact silicon photonic WDM coherent transmitter chip, comprising 16 micro-ring modulators (MRMs). Transmission of 112-Gbps WDM coherent signal (28-Gbaud QPSK $\times 2 \lambda$) is demonstrated through wavelength-and-IQ-selective modulation provided by each MRM.