High-speed SSB transmission with a silicon MZM and a soft combined artificial neural network-based equalization

We experimentally demonstrate high-speed metro-scale optical transmission of a single sideband (SSB) 4-ary pulse amplitude modulation (PAM-4) signal based on a silicon photonic dual-drive Mach-Zehnder modulator (MZM). We propose a novel, to the best of our knowl-edge, artificial neural network (ANN) structure of soft combined ANN (SC-ANN) to compensate for both lin-ear and nonlinear impairments of the signal. SC-ANN obtains the enhanced performance by averaging the out-puts of conventional ANN with different sizes. With the help of the SC-ANN, we achieve a 320 km standard single-mode fiber (SSMF) transmission of 184 Gb/s (92Gbaud) PAM-4 with a bit-error rate (BER) below the 20% soft-decision forward error-correction (SD-FEC) threshold of 2.4 x 10(-2), and the optical signal-to-noise ratio (OSNR) penalty is only 0.3 dB compared to the back-to-back (BTB) results. (C) 2020 Optical Society of America