Published by Infinera. Summary Nyquist subcarriers are a key enhancement to the latest generation of coherent technology. Subcarrier implementations like ICE4 and ICE6 overcome the drawbacks of single-carrier, highbaud-rate operation to deliver industry-leading optical performance. In extensive field trials, and with almost two years of subcarrier-based deployments, Infinera has found a typical gain of around 0.8 decibels in the optical …