Low Cost 100Gb/s/λ PAM-4 Signal Transmission for 40-km Inter-DCI with 4-bit Resolution DAC in O-band

Enabled by adaptive notch filter for clock leakage suppression and noise shaping technique for redistribution of quantization noise in DAC, beyond 100Gb/s PAM-4 signal over 40km SMF transmission in O-band with BER under 3.8×10
^-3
utilizing 4-bit resolution DAC is first experimentally demonstrated in this paper.