LDPC Codes for Optical Channels: Is the “FEC Limit” a Good Predictor of Post-FEC BER?
Alex Alvarado, Erik Agrell, Domaniç Lavery, Polina Bayvel · Optical Fiber Communication Conference · 2015
We answer the question in the title negatively. More precisely, the FEC limit is invalid for soft decision decoding and low to medium code rates. A better predictor is the generalized mutual information.