Multi-Gigabit Coherent Communications Using Low-Rate FEC to Approach the Shannon Capacity Limit
David J. Geisler, Venkat Chandar, Timothy M. Yarnall, Mark L. Stevens, Scott A. Hamilton · 2015
Combining a rate-¼ forward error-correcting code, a coherent receiver, and an optical phase-locked loop yields near error-free performance with 2-dB photon-per-bit sensitivity, which is <3-dB from the Shannon limit for a rate-¼, pre-amplified, coherent receiver.