Abstract
Codes on graphs of interest for next generation forward error correction
(FEC) in high-speed optical networks, namely turbo codes and low-density
parity-check (LDPC) codes, are described in this invited paper. We describe
both binary and nonbinary LDPC codes, their design, and decoding. We also
discuss an FPGA implementation of decoders for binary LDPC codes. We then
explain how to combine multilevel modulation and channel coding optimally by
using coded modulation. Also, we describe an LDPC-coded turbo-equalizer as a
candidate for dealing simultaneously with fiber nonlinearities, PMD, and
residual chromatic dispersion.
© 2009 IEEE
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