No abstract

This study analyzes the performance of digital pre-distortion (DPD) for micro-ring-modulator-based PAM4 modulation. With limited taps for practicality, the optimal de-sign of the DPD was shown to depend on the operating conditions of the modulator.

Based on Volterra filtering, a novel pre-distortion method without significantly altering the transmitted spectra was proposed to eliminate nonlinear distortion in DML-based OFDM transmission. The scheme experimentally increased the capacity by >60% after 150-km transmission.